//! Deterministic stock-pool target planning shared by historical and online execution.
//! Account, quote and fill facts are supplied by the caller; this module has no I/O.
use chrono::NaiveDate;
use rust_decimal::{Decimal, RoundingStrategy};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use std::collections::{BTreeMap, BTreeSet, HashMap};
pub const STOCK_POOL_SCHEMA_VERSION: u32 = 1;

pub const POOL_TRIGGER_FIRST_TICK: &str = "first_tick_after_open";
pub const POOL_TRIGGER_TIME_WINDOW: &str = "time_window";
pub const POOL_TRIGGER_CONDITION: &str = "condition";
pub const POOL_TRIGGER_SCHEDULED_BAR: &str = "scheduled_bar";

pub const POOL_PRICE_FIRST_TICK: &str = "first_tick";
pub const POOL_PRICE_OPENING_AUCTION: &str = "opening_auction";
pub const POOL_PRICE_FIXED_LIMIT: &str = "fixed_limit";
pub const POOL_PRICE_FORMULA_LIMIT: &str = "formula_limit";
pub const POOL_PRICE_CONDITION_THEN_LIMIT: &str = "condition_then_limit";
pub const POOL_PRICE_CONDITION_THEN_MARKET: &str = "condition_then_market";

pub const POOL_SELL_TARGET_DELTA: &str = "target_delta";
pub const POOL_SELL_CONDITION: &str = "condition";
pub const STOCK_POOL_CURRENT_SNAPSHOT_TOLERANCE_SECONDS: u64 = 120;

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum OrderSide {
    Buy,
    Sell,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum QuoteConditionScope {
    #[default]
    PerSymbol,
    AllTargets,
    AnyTarget,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum StockPoolExitRole {
    OrdinarySell,
    RiskExit,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct StockPoolExitSignal {
    pub role: StockPoolExitRole,
    pub when_expr: String,
    pub remaining_position_bps: u32,
    pub reason: String,
}

pub fn stock_pool_target_holding_count(policy: &Value) -> Result<Option<usize>, String> {
    let object = policy
        .as_object()
        .ok_or("allocation_policy must be an object")?;
    let mut observed: Option<Option<usize>> = None;
    for key in ["target_holding_count", "targetHoldingCount"] {
        let Some(raw) = object.get(key) else { continue };
        let count = if raw.is_null() || raw.as_str().is_some_and(|value| value.trim().is_empty()) {
            None
        } else {
            let text = match raw {
                Value::String(value) => value.trim().to_owned(),
                Value::Number(value) => value.to_string(),
                _ => return Err("allocation_policy.target_holding_count must be an integer".into()),
            };
            let value = text
                .parse::<Decimal>()
                .map_err(|_| "allocation_policy.target_holding_count must be an integer")?;
            if value.fract() != Decimal::ZERO
                || value < Decimal::ONE
                || value > Decimal::from(10000)
            {
                return Err(
                    "allocation_policy.target_holding_count must be between 1 and 10000".into(),
                );
            }
            Some(
                value
                    .normalize()
                    .to_string()
                    .parse::<usize>()
                    .map_err(|_| "allocation_policy.target_holding_count must be an integer")?,
            )
        };
        if observed.is_some_and(|previous| previous != count) {
            return Err("allocation_policy.target_holding_count aliases conflict".into());
        }
        observed = Some(count);
    }
    Ok(observed.flatten())
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum MembershipPolicy {
    #[default]
    FollowCandidates,
    RetainHoldings,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct StockPoolPortfolioPolicy {
    pub schema_version: u32,
    pub membership: MembershipPolicy,
    pub rebalance_weights: bool,
}

impl StockPoolPortfolioPolicy {
    pub fn from_legacy(value: &str) -> Result<Self, String> {
        let (membership, rebalance_weights) = match value {
            "full_rebalance" => (MembershipPolicy::FollowCandidates, true),
            "preserve_existing" => (MembershipPolicy::FollowCandidates, false),
            "preserve_members" => (MembershipPolicy::RetainHoldings, true),
            _ => return Err(format!("unsupported top_n_rebalance_policy={value}")),
        };
        Ok(Self {
            schema_version: 1,
            membership,
            rebalance_weights,
        })
    }
    pub fn validate(&self) -> Result<(), String> {
        if self.schema_version != 1 {
            return Err("stock pool portfolio policy schema_version must be 1".into());
        }
        Ok(())
    }
}

pub fn stock_pool_funding_from_configuration(allocation: &Value) -> Result<(i32, Decimal), String> {
    let empty = serde_json::Map::new();
    let object = if allocation.is_null() {
        &empty
    } else {
        allocation
            .as_object()
            .ok_or("allocation_policy must be an object")?
    };
    let number = |keys: &[&str]| -> Result<Option<Decimal>, String> {
        let mut result: Option<Option<Decimal>> = None;
        for key in keys {
            if let Some(value) = object.get(*key) {
                let next = if value.is_null() || value.as_str().is_some_and(|v| v.trim().is_empty())
                {
                    None
                } else {
                    let raw = match value {
                        Value::Number(n) => n.to_string(),
                        Value::String(v) => v.trim().to_owned(),
                        _ => return Err(format!("invalid numeric allocation field:{key}")),
                    };
                    Some(
                        raw.parse::<Decimal>()
                            .map_err(|_| format!("invalid numeric allocation field:{key}"))?,
                    )
                };
                if result.is_some_and(|old| old != next) {
                    return Err(format!("allocation aliases conflict:{}", keys[0]));
                }
                result = Some(next);
            }
        }
        Ok(result.flatten())
    };
    let basis = number(&["invest_ratio_bps", "investRatioBps"])?;
    let fraction = number(&["invest_ratio", "investRatio"])?;
    if fraction.is_some_and(|v| v < Decimal::ZERO || v > Decimal::ONE) {
        return Err("invest_ratio must be in [0,1]; use invest_ratio_bps for basis points".into());
    }
    let normalized_fraction = fraction.map(|value| value * Decimal::from(10000));
    if let (Some(left), Some(right)) = (basis, normalized_fraction) {
        if left != right {
            return Err("investment ratio aliases conflict".into());
        }
    }
    let ratio = basis
        .or(normalized_fraction)
        .unwrap_or(Decimal::from(10000));
    if ratio < Decimal::ZERO || ratio > Decimal::from(10000) || ratio.fract() != Decimal::ZERO {
        return Err("investment ratio must be an integer between 0 and 10000 basis points".into());
    }
    let cash = number(&["reserve_cash", "reserveCash"])?.unwrap_or(Decimal::ZERO);
    if cash < Decimal::ZERO {
        return Err("reserve_cash must be nonnegative".into());
    }
    Ok((
        ratio
            .normalize()
            .to_string()
            .parse::<i32>()
            .map_err(|_| "investment ratio out of range")?,
        cash,
    ))
}

pub fn stock_pool_constraints_from_configuration(
    allocation: &Value,
    stops: &Value,
) -> Result<StockPoolDecisionConstraints, String> {
    stock_pool_funding_from_configuration(allocation)?;
    let empty = serde_json::Map::new();
    let object = if allocation.is_null() {
        &empty
    } else {
        allocation
            .as_object()
            .ok_or("allocation_policy must be an object")?
    };
    let alias = |keys: &[&str]| -> Result<Option<&Value>, String> {
        let mut value = None;
        for key in keys {
            if let Some(next) = object.get(*key) {
                if value.is_some_and(|old| old != next) {
                    return Err(format!("allocation aliases conflict:{}", keys[0]));
                }
                value = Some(next)
            }
        }
        Ok(value)
    };
    let legacy = alias(&["top_n_rebalance_policy", "topNRebalancePolicy"])?;
    if legacy.is_some_and(|value| !value.is_null() && !value.is_string()) {
        return Err("legacy rebalance policy must be a string".into());
    }
    if !stops.is_null() && !stops.is_object() {
        return Err("stop_take_policy must be an object".into());
    }
    let legacy_policy = StockPoolPortfolioPolicy::from_legacy(
        legacy.and_then(Value::as_str).unwrap_or("full_rebalance"),
    )?;
    let policy = if let Some(raw) =
        alias(&["portfolio_policy", "portfolioPolicy"])?.filter(|raw| !raw.is_null())
    {
        let value: StockPoolPortfolioPolicy = serde_json::from_value(raw.clone())
            .map_err(|error| format!("invalid stock pool portfolio policy:{error}"))?;
        value.validate()?;
        if legacy.is_some_and(|value| !value.is_null()) && value != legacy_policy {
            return Err("portfolio policy conflicts with legacy rebalance policy".into());
        }
        value
    } else {
        legacy_policy
    };
    let target_holding_count = if allocation.is_null() {
        None
    } else {
        stock_pool_target_holding_count(allocation)?
    };
    let reserve_cash_slots = match alias(&["reserve_cash_slots", "reserveCashSlots"])?
        .filter(|value| !value.is_null())
    {
        Some(value) => value
            .as_u64()
            .filter(|value| *value <= 10000)
            .ok_or("reserve_cash_slots must be an integer between 0 and 10000")?
            as usize,
        None => 0,
    };
    if reserve_cash_slots > 0 && target_holding_count.is_none() {
        return Err("cash reserve slots require target_holding_count".into());
    }
    let stop = |keys: &[&str]| -> Result<Option<Decimal>, String> {
        let mut found = None;
        for key in keys {
            if let Some(value) = stops.get(*key) {
                let next = if value.is_null() || value.as_str() == Some("") {
                    None
                } else {
                    let text = value
                        .as_str()
                        .map(str::to_owned)
                        .unwrap_or_else(|| value.to_string());
                    let number = text
                        .parse::<Decimal>()
                        .map_err(|_| "invalid stop/take ratio")?;
                    if number < Decimal::ZERO || number >= Decimal::ONE {
                        return Err("stop/take ratio must be in [0,1)".into());
                    }
                    if number == Decimal::ZERO {
                        None
                    } else {
                        Some(number)
                    }
                };
                if found.is_some_and(|old| old != next) {
                    return Err("stop/take aliases conflict".into());
                }
                found = Some(next);
            }
        }
        Ok(found.flatten())
    };
    Ok(StockPoolDecisionConstraints {
        market_timing_policy: Some(
            crate::stock_pool_index_policy::MarketTimingPolicy::from_allocation(allocation)?,
        ),
        portfolio_policy: Some(policy),
        target_holding_count,
        reserve_cash_slots,
        default_stop_loss: stop(&["stop_loss", "stopLoss"])?,
        default_take_profit: stop(&["take_profit", "takeProfit"])?,
        ..Default::default()
    })
}

#[derive(Debug, Clone)]
pub struct AccountSnapshot {
    pub total_equity: Decimal,
    pub cash: Decimal,
    pub frozen_cash: Decimal,
}
#[derive(Debug, Clone)]
pub struct Position {
    pub symbol: String,
    pub quantity: Decimal,
    pub closable_quantity: Decimal,
    pub average_cost: Decimal,
}
#[derive(Debug, Clone)]
pub struct MarketSnapshot {
    pub symbol: String,
    pub last_price: Decimal,
    pub prev_close: Option<Decimal>,
    pub volume: Option<Decimal>,
    pub turnover: Option<Decimal>,
    pub bid_price_1: Option<Decimal>,
    pub ask_price_1: Option<Decimal>,
    pub is_kcb: Option<bool>,
    pub instrument_rules: Option<StockPoolInstrumentRules>,
    /// Explicit execution-adapter estimates; omission means the declared last
    /// price model, never replacement of an invalid supplied value.
    pub buy_sizing_price: Option<Decimal>,
    pub sell_sizing_price: Option<Decimal>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct StockPoolInstrumentRules {
    pub price_tick: Decimal,
    pub quantity_step: Decimal,
    pub minimum_buy_quantity: Decimal,
}

impl StockPoolInstrumentRules {
    pub fn validate(&self) -> Result<(), String> {
        if self.price_tick <= Decimal::ZERO
            || self.price_tick > Decimal::ONE
            || self.quantity_step <= Decimal::ZERO
            || self.quantity_step.fract() != Decimal::ZERO
            || self.minimum_buy_quantity < self.quantity_step
            || self.minimum_buy_quantity.fract() != Decimal::ZERO
        {
            return Err("stock_pool_instrument_rules_invalid".into());
        }
        Ok(())
    }
}

pub fn stock_pool_instrument_rules(
    snapshot: &MarketSnapshot,
) -> Result<StockPoolInstrumentRules, String> {
    if let Some(rules) = &snapshot.instrument_rules {
        rules.validate()?;
        return Ok(rules.clone());
    }
    let is_kcb = snapshot.is_kcb.ok_or_else(|| {
        format!(
            "listed_sector_classification_missing: symbol={}",
            snapshot.symbol
        )
    })?;
    let (quantity_step, minimum_buy_quantity) = if is_kcb {
        (Decimal::ONE, Decimal::from(200))
    } else if snapshot.symbol.ends_with(".BJ") {
        (Decimal::ONE, Decimal::from(100))
    } else {
        (Decimal::from(100), Decimal::from(100))
    };
    Ok(StockPoolInstrumentRules {
        price_tick: Decimal::new(1, 2),
        quantity_step,
        minimum_buy_quantity,
    })
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct StockPoolMemberSpec {
    pub symbol: String,
    #[serde(default)]
    pub recommendation_reason: String,
    #[serde(default)]
    pub requested_order: i32,
    #[serde(default)]
    pub target_weight_bps: Option<i32>,
    #[serde(default)]
    pub stop_loss: Option<Decimal>,
    #[serde(default)]
    pub take_profit: Option<Decimal>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(default)]
pub struct StockPoolExecutionRule {
    #[serde(default, alias = "buyConditionScope")]
    pub buy_condition_scope: Option<QuoteConditionScope>,
    #[serde(default, alias = "sellConditionScope")]
    pub sell_condition_scope: Option<QuoteConditionScope>,
    #[serde(skip)]
    pub secondary_sell_condition: bool,
    #[serde(skip)]
    pub independent_sell_condition: bool,
    #[serde(
        default,
        deserialize_with = "crate::holding_policy::deserialize_optional_policy"
    )]
    pub automatic_trade_protection: crate::holding_policy::AutomaticTradeProtection,
    #[serde(alias = "schemaVersion")]
    pub schema_version: u32,
    #[serde(
        alias = "autoExecute",
        alias = "daily_auto_execute",
        alias = "autoTrade"
    )]
    pub auto_execute: bool,
    #[serde(alias = "freezeCutoff")]
    pub freeze_time: String,
    #[serde(alias = "triggerMode")]
    pub trigger_mode: String,
    #[serde(alias = "windowStart")]
    pub window_start: String,
    #[serde(alias = "windowEnd")]
    pub window_end: String,
    #[serde(alias = "condition")]
    pub buy_condition: String,
    #[serde(alias = "sellTriggerMode")]
    pub sell_trigger_mode: String,
    #[serde(alias = "sellCondition")]
    pub sell_condition: String,
    #[serde(alias = "pricingMode")]
    pub pricing_mode: String,
    #[serde(alias = "fixedPrice")]
    pub fixed_price: Option<Decimal>,
    #[serde(alias = "fixedPrices")]
    pub fixed_prices: BTreeMap<String, Decimal>,
    #[serde(alias = "buyOffsetBps")]
    pub buy_offset_bps: i32,
    #[serde(alias = "sellOffsetBps")]
    pub sell_offset_bps: i32,
    #[serde(alias = "timeInForce")]
    pub time_in_force: String,
    #[serde(alias = "missedWindowPolicy")]
    pub missed_window_policy: String,
    #[serde(alias = "maxChildOrders")]
    pub max_child_orders: u32,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct StockPoolSelection {
    pub trade_date: NaiveDate,
    pub requested_symbols: Vec<String>,
    pub normal_trading_symbols: Vec<String>,
    pub risk_eligible_symbols: Vec<String>,
    pub final_symbols: Vec<String>,
    #[serde(default)]
    pub exclusion_reasons: BTreeMap<String, Vec<String>>,
    #[serde(default)]
    pub inherited_from_generation: Option<String>,
    #[serde(default)]
    pub explicit_empty: bool,
    #[serde(default)]
    pub generation: Option<String>,
}

#[derive(Debug, Clone, Default, PartialEq)]
pub struct StockPoolDecisionConstraints {
    pub execution_date: Option<NaiveDate>,
    pub frozen_positions: BTreeMap<String, FrozenStockPoolPosition>,
    pub prior_target_weights: BTreeMap<String, i32>,
    pub pending_entry_symbols: BTreeSet<String>,
    pub next_day_outside_exit_symbols: BTreeSet<String>,
    pub market_timing_policy: Option<crate::stock_pool_index_policy::MarketTimingPolicy>,
    pub market_timing_input: Option<crate::stock_pool_index_policy::MarketTimingInput>,
    pub portfolio_policy: Option<StockPoolPortfolioPolicy>,
    pub target_holding_count: Option<usize>,
    pub reserve_cash_slots: usize,
    pub default_stop_loss: Option<Decimal>,
    pub default_take_profit: Option<Decimal>,
    pub position_target_bps: BTreeMap<String, u32>,
    pub independent_position_target_bps: BTreeMap<String, u32>,
    /// First actually planned holding quantity for this generation. Retries
    /// apply percentages to this basis, never to the remaining holding.
    pub position_action_bases: BTreeMap<String, Decimal>,
    pub buy_denials: BTreeMap<String, Vec<String>>,
    pub same_day_sold_symbols: BTreeSet<String>,
    pub automatic_permissions: BTreeMap<String, crate::holding_policy::AutomaticTradePermission>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct FrozenStockPoolPosition {
    pub trade_date: NaiveDate,
    pub reason: String,
    pub valuation_price: Decimal,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct StockPoolPlanRow {
    pub symbol: String,
    pub target_weight_bps: i32,
    pub target_value: Decimal,
    pub current_quantity: Decimal,
    pub target_quantity: Decimal,
    pub delta_quantity: Decimal,
    pub side: Option<OrderSide>,
    pub status: String,
    pub reason: String,
    pub reference_price: Option<Decimal>,
    pub order_type: Option<String>,
    pub limit_price: Option<Decimal>,
    pub source_intent: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct StockPoolPlan {
    #[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
    pub position_action_bases: BTreeMap<String, Decimal>,
    pub market_timing: Option<crate::stock_pool_index_policy::MarketTimingEvaluation>,
    pub rows: Vec<StockPoolPlanRow>,
    pub budget: Decimal,
    pub estimated_buy_amount: Decimal,
    pub estimated_sell_amount: Decimal,
    pub estimated_cash_after: Decimal,
    pub requested_invest_ratio_bps: i32,
    pub effective_invest_ratio_bps: Decimal,
    pub retained_slots: usize,
}

/// A signal-time contract. Only the broker/execution adapter supplies later
/// prices, actual cash and holdings; strategy code never sees those inputs.
#[derive(Debug, Clone)]
pub struct FrozenStockPoolIntent {
    pub pool_id: String,
    pub signal_date: NaiveDate,
    pub frozen_equity: Decimal,
    pub selection: StockPoolSelection,
    pub members: Vec<StockPoolMemberSpec>,
    pub rule: StockPoolExecutionRule,
    pub constraints: StockPoolDecisionConstraints,
    pub invest_ratio_bps: i32,
    pub reserve_cash: Decimal,
    pub out_of_pool_policy: String,
    pub generation: String,
}

/// Complete immutable pool execution configuration, distinct from a generated
/// code strategy. Source screening/event evidence remains separately bound.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct StockPoolProgram {
    pub schema_version: u32,
    pub pool_id: String,
    pub version_id: String,
    pub members: Vec<StockPoolMemberSpec>,
    pub allocation_policy: Value,
    pub timing_policy: Value,
    pub stop_take_policy: Value,
    pub out_of_pool_policy: String,
    #[serde(default, skip_serializing_if = "Vec::is_empty")]
    pub exit_signals: Vec<StockPoolExitSignal>,
}

impl StockPoolProgram {
    pub fn validate(&self, secondary_buy: bool, secondary_sell: bool) -> Result<(), String> {
        if self.schema_version != 1
            || self.pool_id.trim().is_empty()
            || self.version_id.trim().is_empty()
        {
            return Err("stock_pool_program_identity_invalid".into());
        }
        normalize_stock_pool_members(&self.members)?;
        stock_pool_funding_from_configuration(&self.allocation_policy)?;
        stock_pool_constraints_from_configuration(&self.allocation_policy, &self.stop_take_policy)?;
        let mut identities = BTreeSet::new();
        for signal in &self.exit_signals {
            if signal.when_expr.trim().is_empty() || signal.reason.trim().is_empty() || signal.remaining_position_bps >= 10000 {
                return Err("stock_pool_exit_signal_invalid".into());
            }
            let identity = serde_json::to_string(signal).map_err(|error| error.to_string())?;
            if !identities.insert(identity) { return Err("stock_pool_exit_signal_duplicate".into()); }
        }
        normalize_stock_pool_execution_rule_with_exit_roles(
            Some(&self.timing_policy),
            secondary_buy,
            secondary_sell || self.exit_signals.iter().any(|signal| signal.role == StockPoolExitRole::OrdinarySell),
            self.exit_signals.iter().any(|signal| signal.role == StockPoolExitRole::RiskExit),
        )?;
        if !matches!(
            self.out_of_pool_policy.as_str(),
            "hold" | "reduce_to_zero_when_sellable" | "reduce_next_trading_day"
        ) {
            return Err("stock_pool_program_outside_policy_invalid".into());
        }
        Ok(())
    }
}

impl Default for StockPoolExecutionRule {
    fn default() -> Self {
        Self {
            buy_condition_scope: None,
            sell_condition_scope: None,
            secondary_sell_condition: false,
            independent_sell_condition: false,
            automatic_trade_protection: Default::default(),
            schema_version: STOCK_POOL_SCHEMA_VERSION,
            auto_execute: true,
            freeze_time: "09:20".to_string(),
            trigger_mode: POOL_TRIGGER_FIRST_TICK.to_string(),
            window_start: "09:30".to_string(),
            window_end: "09:35".to_string(),
            buy_condition: String::new(),
            sell_trigger_mode: POOL_SELL_TARGET_DELTA.to_string(),
            sell_condition: String::new(),
            pricing_mode: POOL_PRICE_FORMULA_LIMIT.to_string(),
            fixed_price: None,
            fixed_prices: BTreeMap::new(),
            buy_offset_bps: 0,
            sell_offset_bps: 0,
            time_in_force: "DAY".to_string(),
            missed_window_policy: "intraday_catchup".to_string(),
            max_child_orders: 1,
        }
    }
}

pub fn build_stock_pool_target_plan_with_constraints(
    selection: &StockPoolSelection,
    members: &[StockPoolMemberSpec],
    rule: &StockPoolExecutionRule,
    account: &AccountSnapshot,
    positions: &[Position],
    quotes: &[MarketSnapshot],
    invest_ratio_bps: i32,
    reserve_cash: Decimal,
    out_of_pool_policy: &str,
    top_n_rebalance_policy: &str,
    constraints: &StockPoolDecisionConstraints,
    generation: &str,
    commission_rate: Decimal,
    minimum_commission: Decimal,
    stamp_tax_rate: Decimal,
) -> Result<StockPoolPlan, String> {
    build_stock_pool_target_plan_with_fee_model(
        selection,
        members,
        rule,
        account,
        positions,
        quotes,
        invest_ratio_bps,
        reserve_cash,
        out_of_pool_policy,
        top_n_rebalance_policy,
        constraints,
        generation,
        commission_rate,
        minimum_commission,
        stamp_tax_rate,
        None,
    )
}

pub fn build_stock_pool_target_plan_with_fee_model(
    selection: &StockPoolSelection,
    members: &[StockPoolMemberSpec],
    rule: &StockPoolExecutionRule,
    account: &AccountSnapshot,
    positions: &[Position],
    quotes: &[MarketSnapshot],
    invest_ratio_bps: i32,
    reserve_cash: Decimal,
    out_of_pool_policy: &str,
    top_n_rebalance_policy: &str,
    constraints: &StockPoolDecisionConstraints,
    generation: &str,
    commission_rate: Decimal,
    minimum_commission: Decimal,
    stamp_tax_rate: Decimal,
    fee_model: Option<&dyn Fn(&str, OrderSide, Decimal) -> Result<Decimal, String>>,
) -> Result<StockPoolPlan, String> {
    if rule.automatic_trade_protection.enabled() {
        for symbol in stock_pool_execution_quote_symbols(&selection.requested_symbols, positions) {
            if !constraints.automatic_permissions.contains_key(&symbol) {
                return Err(format!(
                    "automatic_trade_protection_permission_missing:{symbol}"
                ));
            }
        }
    }
    // Validate source targets before a stronger stop/expiry can replace them.
    // Otherwise an invalid ratio could be hidden by target consolidation.
    for (symbol, target) in constraints.position_target_bps.iter().chain(constraints.independent_position_target_bps.iter()) {
        if *target >= 10_000 {
            return Err(format!("factor position target for {symbol} must be below 10000 bps"));
        }
    }
    let mut effective_position_targets = constraints.position_target_bps.clone();
    for (symbol, target) in &constraints.independent_position_target_bps {
        effective_position_targets.entry(symbol.clone()).and_modify(|current| *current = (*current).min(*target)).or_insert(*target);
    }
    for (symbol, permission) in &constraints.automatic_permissions {
        if permission.max_holding_exit {
            effective_position_targets.insert(symbol.clone(), 0);
        }
    }
    let same_day_sold_symbols = &constraints.same_day_sold_symbols;
    if !(0..=10_000).contains(&invest_ratio_bps) {
        return Err("invest_ratio_bps must be between 0 and 10000".to_string());
    }
    if reserve_cash < Decimal::ZERO {
        return Err("reserve_cash must be non-negative".to_string());
    }
    if commission_rate < Decimal::ZERO
        || minimum_commission < Decimal::ZERO
        || stamp_tax_rate < Decimal::ZERO
    {
        return Err("stock pool fee settings must be non-negative".to_string());
    }
    let fee_for = |symbol: &str, side: OrderSide, gross: Decimal| -> Result<Decimal, String> {
        let fee = if let Some(model) = fee_model {
            model(symbol, side, gross)?
        } else {
            commission_for_notional(gross, commission_rate, minimum_commission)
                + if side == OrderSide::Sell {
                    gross * stamp_tax_rate
                } else {
                    Decimal::ZERO
                }
        };
        if fee < Decimal::ZERO {
            return Err("stock pool fee model returned a negative cost".into());
        }
        Ok(fee)
    };
    if !matches!(
        out_of_pool_policy,
        "hold" | "reduce_to_zero_when_sellable" | "reduce_next_trading_day"
    ) {
        return Err(format!(
            "unsupported out_of_pool_policy={out_of_pool_policy}"
        ));
    }
    let portfolio_policy = constraints
        .portfolio_policy
        .clone()
        .map(Ok)
        .unwrap_or_else(|| StockPoolPortfolioPolicy::from_legacy(top_n_rebalance_policy))?;
    portfolio_policy.validate()?;
    if constraints.target_holding_count == Some(0)
        || (constraints.reserve_cash_slots > 0 && constraints.target_holding_count.is_none())
    {
        return Err("cash reserve slots require a positive target holding count".into());
    }
    let mut normalized_members = normalize_stock_pool_members(members)?;
    for member in &mut normalized_members {
        if member.stop_loss.is_none() {
            member.stop_loss = constraints.default_stop_loss;
        }
        if member.take_profit.is_none() {
            member.take_profit = constraints.default_take_profit;
        }
    }
    let quote_map = quotes
        .iter()
        .filter_map(|quote| normalize_stock_symbol(&quote.symbol).map(|symbol| (symbol, quote)))
        .collect::<HashMap<_, _>>();
    let mut current = BTreeMap::<String, (Decimal, Decimal, Decimal)>::new();
    for position in positions {
        let Some(symbol) = normalize_stock_symbol(&position.symbol) else {
            continue;
        };
        if position.quantity < Decimal::ZERO
            || position.closable_quantity < Decimal::ZERO
            || position.closable_quantity > position.quantity
        {
            return Err(format!("invalid managed stock position quantity:{symbol}"));
        }
        if current
            .insert(
                symbol.clone(),
                (
                    position.quantity,
                    position.closable_quantity,
                    position.average_cost,
                ),
            )
            .is_some()
        {
            return Err(format!("duplicate managed stock position:{symbol}"));
        }
    }
    if quote_map.len() != quotes.len() {
        return Err("duplicate or invalid stock pool execution quotes".into());
    }
    let declared_symbols = normalized_members.iter().map(|member| member.symbol.as_str()).collect::<BTreeSet<_>>();
    for (symbol, quantity) in &constraints.position_action_bases {
        if normalize_stock_symbol(symbol).as_ref() != Some(symbol) || *quantity <= Decimal::ZERO {
            return Err(format!("invalid stock pool position-action basis:{symbol}"));
        }
    }
    for (symbol, _) in constraints.position_target_bps.iter().chain(constraints.independent_position_target_bps.iter()) {
        if normalize_stock_symbol(symbol).as_deref() != Some(symbol.as_str()) || (!declared_symbols.contains(symbol.as_str()) && !current.contains_key(symbol)) {
            return Err(format!("position action is outside declared candidates and managed holdings:{symbol}"));
        }
    }
    // Exit rules act on managed holdings, not on an unheld candidate's entry.
    effective_position_targets.retain(|symbol, _| current.get(symbol).is_some_and(|position| position.0 > Decimal::ZERO));
    frozen::validate(selection.trade_date, constraints, &current)?;
    for symbol in constraints.frozen_positions.keys() {
        effective_position_targets.remove(symbol);
    }
    if portfolio_policy.membership == MembershipPolicy::RetainHoldings
        && out_of_pool_policy == "hold"
    {
        let known = normalized_members
            .iter()
            .map(|member| member.symbol.clone())
            .collect::<BTreeSet<_>>();
        for (symbol, (quantity, _, _)) in &current {
            if *quantity > Decimal::ZERO && !known.contains(symbol) {
                normalized_members.push(StockPoolMemberSpec {
                    symbol: symbol.clone(),
                    requested_order: normalized_members.len() as i32,
                    recommendation_reason: String::new(),
                    target_weight_bps: None,
                    stop_loss: constraints.default_stop_loss,
                    take_profit: constraints.default_take_profit,
                });
            }
        }
    }
    let member_map = normalized_members
        .iter()
        .map(|member| (member.symbol.clone(), member))
        .collect::<HashMap<_, _>>();
    let explicit_weights = normalized_members
        .iter()
        .filter_map(|member| {
            member
                .target_weight_bps
                .map(|weight| (member.symbol.clone(), weight))
        })
        .collect::<BTreeMap<_, _>>();
    let mut original_final_symbols = normalize_symbol_list(&selection.final_symbols)?;
    let capacity = constraints.target_holding_count.unwrap_or_else(|| {
        original_final_symbols.len()
            + constraints
                .frozen_positions
                .keys()
                .filter(|symbol| {
                    member_map.contains_key(*symbol) && !original_final_symbols.contains(symbol)
                })
                .count()
    });
    if portfolio_policy.membership == MembershipPolicy::RetainHoldings {
        let retained = normalized_members
            .iter()
            .filter(|member| {
                current
                    .get(&member.symbol)
                    .is_some_and(|row| row.0 > Decimal::ZERO)
                    && !effective_position_targets.contains_key(&member.symbol)
            })
            .map(|member| member.symbol.clone())
            .collect::<Vec<_>>();
        let mut chosen = retained.into_iter().take(capacity).collect::<Vec<_>>();
        for symbol in &original_final_symbols {
            if chosen.len() >= capacity {
                break;
            }
            if !chosen.contains(symbol) {
                chosen.push(symbol.clone())
            }
        }
        original_final_symbols = chosen;
    } else {
        original_final_symbols.truncate(capacity);
    }
    let mut protected_positions = constraints
        .automatic_permissions
        .iter()
        .filter(|(symbol, permission)| {
            permission.sell_denial.is_some()
                && current
                    .get(*symbol)
                    .is_some_and(|position| position.0 > Decimal::ZERO)
        })
        .map(|(symbol, _)| symbol.clone())
        .collect::<BTreeSet<_>>();
    protected_positions.extend(constraints.frozen_positions.keys().cloned());
    let global_stop_hits = current
        .iter()
        .filter_map(|(symbol, (quantity, _, cost))| {
            let member = member_map.get(symbol)?;
            let quote = quote_map.get(symbol)?;
            (*quantity > Decimal::ZERO
                && *cost > Decimal::ZERO
                && !protected_positions.contains(symbol)
                && (member.stop_loss.is_some_and(|stop| {
                    stop > Decimal::ZERO && quote.last_price <= *cost * (Decimal::ONE - stop)
                }) || member.take_profit.is_some_and(|take| {
                    take > Decimal::ZERO && quote.last_price >= *cost * (Decimal::ONE + take)
                })))
            .then(|| symbol.clone())
        })
        .collect::<BTreeSet<_>>();
    // A full stop is stricter than a simultaneous relative reduction. Merge
    // the target before selecting its single owner, never emit a second exit.
    for symbol in &global_stop_hits {
        if let Some(target) = effective_position_targets.get_mut(symbol) {
            *target = 0;
        }
    }
    let mut quote_sell_exits = BTreeSet::new();
    let mut sell_condition_denials = BTreeSet::new();
    if rule.sell_trigger_mode == POOL_SELL_CONDITION {
        let ordinary_enabled = !rule.sell_condition.trim().is_empty() || rule.secondary_sell_condition;
        // Ordinary sell predicates only depend on positions participating in
        // that stage. Independent stops/expiry and protected holdings were
        // already decided above; unrelated quote fields must not block them.
        let held = current
            .iter()
            .filter(|(symbol, row)| {
                row.0 > Decimal::ZERO
                    && !protected_positions.contains(*symbol)
                    && !global_stop_hits.contains(*symbol)
                    && constraints.independent_position_target_bps.get(*symbol) != Some(&0)
                    && !constraints.automatic_permissions.get(*symbol)
                        .is_some_and(|permission| permission.max_holding_exit)
            })
            .map(|(symbol, _)| symbol.clone())
            .collect::<Vec<_>>();
        let qualified = if ordinary_enabled { quote_condition_results(
            &rule.sell_condition,
            rule.sell_condition_scope,
            &held,
            &quote_map,
        )? } else { BTreeMap::new() };
        for symbol in held {
            let permitted = ordinary_enabled && qualified.get(&symbol) == Some(&true)
                && (!rule.secondary_sell_condition
                    || constraints.position_target_bps.contains_key(&symbol));
            if !permitted {
                effective_position_targets.remove(&symbol);
                if let Some(target) = constraints.independent_position_target_bps.get(&symbol) {
                    effective_position_targets.insert(symbol.clone(), *target);
                } else {
                    sell_condition_denials.insert(symbol.clone());
                }
            } else if !rule.secondary_sell_condition {
                quote_sell_exits.insert(symbol.clone());
                effective_position_targets.insert(symbol, 0);
            }
        }
        protected_positions.extend(sell_condition_denials.iter().cloned());
    }
    let factor_position_target_bps = &effective_position_targets;
    let reserved_protected_slots = protected_positions
        .iter()
        .filter(|symbol| !original_final_symbols.contains(symbol))
        .count();
    let maximum_holding_exits = constraints
        .automatic_permissions
        .iter()
        .filter(|(symbol, permission)| {
            permission.max_holding_exit && !constraints.frozen_positions.contains_key(*symbol)
        })
        .map(|(symbol, _)| symbol.clone())
        .collect::<BTreeSet<_>>();
    let mut stop_take_exits = global_stop_hits;
    stop_take_exits.extend(quote_sell_exits.iter().cloned());
    for symbol in &original_final_symbols {
        if protected_positions.contains(symbol) {
            continue;
        }
        let Some(member) = member_map.get(symbol) else {
            continue;
        };
        let Some((quantity, _closable, cost)) = current.get(symbol) else {
            continue;
        };
        let Some(quote) = quote_map.get(symbol) else {
            continue;
        };
        if *quantity > Decimal::ZERO
            && *cost > Decimal::ZERO
            && (member.stop_loss.is_some_and(|stop| {
                stop > Decimal::ZERO && quote.last_price <= *cost * (Decimal::ONE - stop)
            }) || member.take_profit.is_some_and(|take| {
                take > Decimal::ZERO && quote.last_price >= *cost * (Decimal::ONE + take)
            }))
        {
            stop_take_exits.insert(symbol.clone());
        }
    }
    stop_take_exits.extend(maximum_holding_exits.iter().cloned());
    let normalized_same_day_sold =
        normalize_symbol_set(&same_day_sold_symbols.iter().cloned().collect::<Vec<_>>())?;
    let mut rebuy_exclusions = stop_take_exits.clone();
    rebuy_exclusions.extend(effective_position_targets.keys().cloned());
    rebuy_exclusions.extend(
        normalized_same_day_sold
            .iter()
            .filter(|symbol| {
                current
                    .get(*symbol)
                    .is_none_or(|row| row.0 == Decimal::ZERO)
            })
            .cloned(),
    );
    let target_count = capacity.saturating_sub(reserved_protected_slots);
    let free_slots = capacity.saturating_sub(protected_positions.len());
    let mut unprotected_count = 0;
    let mut active_symbols = original_final_symbols
        .iter()
        .filter(|symbol| !rebuy_exclusions.contains(*symbol))
        .filter(|symbol| {
            if protected_positions.contains(*symbol) {
                return true;
            }
            if unprotected_count >= free_slots {
                return false;
            }
            unprotected_count += 1;
            true
        })
        .cloned()
        .collect::<Vec<_>>();
    let mut promoted_symbols = Vec::new();
    let risk_eligible_symbols = normalize_symbol_set(&selection.risk_eligible_symbols)?;
    let normal_symbols = normalize_symbol_set(&selection.normal_trading_symbols)?;
    for raw_symbol in &selection.requested_symbols {
        if active_symbols.len() >= target_count {
            break;
        }
        let Some(symbol) = normalize_stock_symbol(raw_symbol) else {
            continue;
        };
        if rebuy_exclusions.contains(&symbol)
            || !risk_eligible_symbols.contains(&symbol)
            || !normal_symbols.contains(&symbol)
            || selection.exclusion_reasons.contains_key(&symbol)
            || factor_position_target_bps.contains_key(&symbol)
            || active_symbols.contains(&symbol)
            || !member_map.contains_key(&symbol)
            || !quote_map.contains_key(&symbol)
        {
            continue;
        }
        active_symbols.push(symbol.clone());
        promoted_symbols.push(symbol);
    }
    let mut weights = if explicit_weights.is_empty() && constraints.frozen_positions.is_empty() {
        let count = (active_symbols.len() + reserved_protected_slots) as i32;
        let (share, remainder) = if count == 0 {
            (0, 0)
        } else {
            (10_000 / count, 10_000 % count)
        };
        active_symbols
            .iter()
            .enumerate()
            .map(|(index, symbol)| {
                (
                    symbol.clone(),
                    share + i32::from((index as i32) < remainder),
                )
            })
            .collect::<BTreeMap<_, _>>()
    } else {
        frozen::weights(
            &original_final_symbols,
            &active_symbols,
            &normalized_members,
            &explicit_weights,
            constraints,
            reserved_protected_slots,
            target_count,
        )?
    };
    for symbol in &rebuy_exclusions {
        if original_final_symbols.contains(symbol) || current.contains_key(symbol) {
            weights.insert(symbol.clone(), 0);
        }
    }
    let mut planning_symbols = active_symbols;
    for symbol in &original_final_symbols {
        // An explicit quote/expiry position action owns its single target row.
        // Keep it excluded from entry sizing without adding a second stop row.
        if rebuy_exclusions.contains(symbol)
            && !factor_position_target_bps.contains_key(symbol)
            && !planning_symbols.contains(symbol)
        {
            planning_symbols.push(symbol.clone());
        }
    }
    for symbol in &maximum_holding_exits {
        if member_map.contains_key(symbol)
            && !factor_position_target_bps.contains_key(symbol)
            && !planning_symbols.contains(symbol)
        {
            weights.insert(symbol.clone(), 0);
            planning_symbols.push(symbol.clone());
        }
    }
    for symbol in &stop_take_exits {
        if current
            .get(symbol)
            .is_some_and(|position| position.0 > Decimal::ZERO)
            && member_map.contains_key(symbol)
            && !factor_position_target_bps.contains_key(symbol)
            && !planning_symbols.contains(symbol)
        {
            weights.insert(symbol.clone(), 0);
            planning_symbols.push(symbol.clone());
        }
    }
    let active_target_symbols = weights
        .iter()
        .filter_map(|(symbol, weight)| (*weight > 0).then_some(symbol.clone()))
        .collect::<BTreeSet<_>>();
    let buy_condition_allowed = if !rule.buy_condition.trim().is_empty() {
        quote_condition_results(
            &rule.buy_condition,
            rule.buy_condition_scope,
            &active_target_symbols
                .iter()
                .filter(|symbol| !constraints.frozen_positions.contains_key(*symbol))
                .cloned()
                .collect::<Vec<_>>(),
            &quote_map,
        )?
    } else {
        BTreeMap::new()
    };
    let top_n_demoted_symbols =
        if selection.final_symbols.len() < selection.risk_eligible_symbols.len() {
            current
                .iter()
                .filter_map(|(symbol, (quantity, _, _))| {
                    (*quantity > Decimal::ZERO
                        && risk_eligible_symbols.contains(symbol)
                        && !active_target_symbols.contains(symbol)
                        && !factor_position_target_bps.contains_key(symbol))
                    .then_some(symbol.clone())
                })
                .collect::<BTreeSet<_>>()
        } else {
            BTreeSet::new()
        };
    for symbol in &top_n_demoted_symbols {
        weights.insert(symbol.clone(), 0);
        if !planning_symbols.contains(symbol) {
            planning_symbols.push(symbol.clone());
        }
    }
    let occupied_slots = planning_symbols
        .iter()
        .filter(|symbol| weights.get(*symbol).is_some_and(|weight| *weight > 0))
        .count()
        + reserved_protected_slots;
    let seat_scale = if constraints.reserve_cash_slots > 0 {
        Decimal::from(occupied_slots.min(capacity) as u64)
            / Decimal::from(
                capacity
                    .checked_add(constraints.reserve_cash_slots)
                    .ok_or("stock pool seat count overflow")? as u64,
            )
    } else {
        Decimal::ONE
    };
    let market_timing = constraints
        .market_timing_policy
        .as_ref()
        .filter(|policy| policy.enabled)
        .map(|policy| {
            let input = constraints
                .market_timing_input
                .as_ref()
                .ok_or("market_timing_verified_completed_index_input_required")?;
            crate::stock_pool_index_policy::evaluate(policy, input, selection.trade_date)
        })
        .transpose()?;
    let market_exposure = market_timing
        .as_ref()
        .map(|result| {
            result
                .exposure
                .to_string()
                .parse::<Decimal>()
                .map_err(|_| "market_timing_exposure_out_of_range")
        })
        .transpose()?
        .unwrap_or(Decimal::ONE);
    let effective_invest_ratio_bps = Decimal::from(invest_ratio_bps) * market_exposure * seat_scale;
    let base_budget = account.total_equity * Decimal::from(invest_ratio_bps)
        / Decimal::from(10_000)
        * market_exposure;
    let investment_budget = if constraints.reserve_cash_slots > 0 {
        base_budget * Decimal::from(occupied_slots.min(capacity) as u64)
            / Decimal::from((capacity + constraints.reserve_cash_slots) as u64)
    } else {
        base_budget
    };
    let budget = (investment_budget - reserve_cash).max(Decimal::ZERO);
    let requested_weight_total = if explicit_weights.is_empty() {
        10_000
    } else {
        original_final_symbols
            .iter()
            .map(|symbol| *explicit_weights.get(symbol).unwrap_or(&0))
            .sum::<i32>()
            .max(weights.values().copied().sum())
    };
    let mut protected_values = protected_positions
        .iter()
        .map(|symbol| {
            let current_value = current[symbol].0
                * frozen::valuation(symbol, &quote_map, &constraints.frozen_positions)?;
            let desired =
                budget * Decimal::from(*weights.get(symbol).unwrap_or(&0)) / Decimal::from(10_000);
            if constraints.frozen_positions.contains_key(symbol) {
                return Ok((symbol.clone(), desired));
            }
            let fixed = constraints
                .automatic_permissions
                .get(symbol)
                .is_some_and(|permission| permission.buy_denial.is_some());
            Ok((
                symbol.clone(),
                if fixed {
                    current_value
                } else {
                    current_value.max(desired)
                },
            ))
        })
        .collect::<Result<BTreeMap<_, _>, String>>()?;
    // Retaining completed holdings consumes their actual value. New slots
    // share only the remaining budget; their smaller allocation is not a
    // fictitious cash failure caused by an equal-weight target for old names.
    if !portfolio_policy.rebalance_weights && budget > Decimal::ZERO {
        for symbol in &planning_symbols {
            if weights.get(symbol).is_some_and(|weight| *weight > 0)
                && !constraints.frozen_positions.contains_key(symbol)
                && !constraints.pending_entry_symbols.contains(symbol)
                && !stop_take_exits.contains(symbol)
                && let Some((quantity, _, _)) =
                    current.get(symbol).filter(|row| row.0 > Decimal::ZERO)
            {
                let price = quote_map
                    .get(symbol)
                    .ok_or_else(|| format!("{symbol} retained holding quote missing"))?
                    .last_price;
                protected_values.insert(symbol.clone(), *quantity * price);
            }
        }
    }
    let free_desired = weights
        .iter()
        .filter(|(symbol, _)| !protected_values.contains_key(*symbol))
        .map(|(_, weight)| budget * Decimal::from(*weight) / Decimal::from(10_000))
        .sum::<Decimal>();
    let free_budget = (budget * Decimal::from(requested_weight_total) / Decimal::from(10_000)
        - protected_values.values().copied().sum::<Decimal>())
    .max(Decimal::ZERO);
    let free_scale = if protected_values.is_empty() || free_desired <= Decimal::ZERO {
        Decimal::ONE
    } else {
        (free_budget / free_desired).min(Decimal::ONE)
    };
    let mut rows = Vec::new();
    let mut estimated_buy_amount = Decimal::ZERO;
    let mut estimated_sell_amount = Decimal::ZERO;
    for (symbol, fact) in &constraints.frozen_positions {
        let quantity = current[symbol].0;
        let weight = *weights.get(symbol).unwrap_or(&0);
        rows.push(StockPoolPlanRow {
            symbol: symbol.clone(),
            target_weight_bps: weight,
            target_value: budget * Decimal::from(weight) / Decimal::from(10_000),
            current_quantity: quantity,
            target_quantity: quantity,
            delta_quantity: Decimal::ZERO,
            side: None,
            status: "MARKET_SUSPENDED".into(),
            reason: "当日正式停牌，保留原预算与席位；估值不作为成交报价".into(),
            reference_price: Some(fact.valuation_price),
            order_type: None,
            limit_price: None,
            source_intent: None,
        });
    }

    // Out-of-pool positions are intentionally explicit.  The default is hold;
    // this prevents an edited pool from silently liquidating unrelated work.
    for (symbol, (quantity, closable, _cost)) in current.iter().filter(|(symbol, _)| {
        !member_map.contains_key(*symbol)
            && !factor_position_target_bps.contains_key(*symbol)
            && !constraints.frozen_positions.contains_key(*symbol)
    }) {
        let outside_policy = if maximum_holding_exits.contains(symbol)
            || (out_of_pool_policy == "reduce_next_trading_day"
                && constraints.next_day_outside_exit_symbols.contains(symbol))
        {
            "reduce_to_zero_when_sellable"
        } else {
            out_of_pool_policy
        };
        let (status, delta, target, side, reason) = match outside_policy {
            "hold" => (
                "OUT_OF_SCOPE",
                Decimal::ZERO,
                *quantity,
                None,
                "持仓不在本股票池管理范围，按配置继续持有",
            ),
            "reduce_next_trading_day" => (
                "DEFERRED_T_PLUS_ONE",
                Decimal::ZERO,
                *quantity,
                None,
                "移出股票池，按配置顺延到下一交易日处理",
            ),
            _ => {
                let sellable = (*closable).min(*quantity);
                if sellable > Decimal::ZERO {
                    estimated_sell_amount += sellable
                        * quote_map
                            .get(symbol)
                            .map(|quote| quote.last_price)
                            .unwrap_or(Decimal::ZERO);
                    (
                        "READY",
                        -sellable,
                        *quantity - sellable,
                        Some(OrderSide::Sell),
                        "移出股票池，按配置清仓可卖数量",
                    )
                } else {
                    (
                        "DEFERRED_T_PLUS_ONE",
                        Decimal::ZERO,
                        *quantity,
                        None,
                        "移出股票池，当前没有可卖数量",
                    )
                }
            }
        };
        let (outside_order_type, outside_limit_price) = if delta != Decimal::ZERO {
            let quote = quote_map
                .get(symbol)
                .ok_or_else(|| format!("{symbol} missing current execution quote"))?;
            let (kind, price) = resolve_stock_pool_order_price(
                rule,
                symbol,
                quote.last_price,
                OrderSide::Sell,
                stock_pool_instrument_rules(quote)?.price_tick,
            )?;
            (Some(kind), price)
        } else {
            (None, None)
        };
        rows.push(StockPoolPlanRow {
            symbol: symbol.clone(),
            target_weight_bps: 0,
            target_value: Decimal::ZERO,
            current_quantity: *quantity,
            target_quantity: target,
            delta_quantity: delta,
            side,
            status: status.to_string(),
            reason: reason.to_string(),
            reference_price: quote_map.get(symbol).map(|quote| quote.last_price),
            order_type: outside_order_type,
            limit_price: outside_limit_price,
            source_intent: (delta != Decimal::ZERO)
                .then(|| format!("stock_pool:{generation}:{symbol}:sell")),
        });
    }

    for (symbol, target_bps) in factor_position_target_bps {
        if !member_map.contains_key(symbol) && !current.contains_key(symbol) {
            return Err(format!(
                "factor position-action symbol {symbol} is outside candidates and managed holdings"
            ));
        }
        let current_quantity = current
            .get(symbol)
            .map(|value| value.0)
            .unwrap_or(Decimal::ZERO);
        let closable_quantity = current
            .get(symbol)
            .map(|value| value.1)
            .unwrap_or(current_quantity);
        let quote = quote_map.get(symbol);
        let step = if *target_bps == 0 || current_quantity == Decimal::ZERO {
            Decimal::ONE
        } else {
            order_quantity_rules(quote.ok_or_else(|| {
                format!("{symbol} missing current execution quote for factor reduction")
            })?)?
            .0
        };
        let requested_target = if *target_bps == 0 {
            Decimal::ZERO
        } else {
            floor_step(
                constraints.position_action_bases.get(symbol).copied().unwrap_or(current_quantity)
                    * Decimal::from(*target_bps) / Decimal::from(10_000),
                step,
            )
        }.min(current_quantity);
        let desired_reduction = (current_quantity - requested_target).max(Decimal::ZERO);
        let executable = if *target_bps == 0 {
            closable_quantity.min(current_quantity).max(Decimal::ZERO)
        } else {
            floor_step(
                desired_reduction.min(closable_quantity).max(Decimal::ZERO),
                step,
            )
        };
        let (status, reason, delta, target, side, order_type, limit_price) =
            if current_quantity == Decimal::ZERO {
                (
                    "FACTOR_EXIT_ALREADY_SATISFIED",
            "持仓退出规则命中，当前无持仓",
                    Decimal::ZERO,
                    Decimal::ZERO,
                    None,
                    None,
                    None,
                )
            } else if desired_reduction == Decimal::ZERO {
                (
                    "FACTOR_EXIT_ALREADY_SATISFIED",
                    "本次信号的持仓退出目标已达到，不重复减仓",
                    Decimal::ZERO,
                    current_quantity,
                    None,
                    None,
                    None,
                )
            } else if executable == Decimal::ZERO && closable_quantity >= desired_reduction {
                (
                    "BELOW_MINIMUM_TRADE_UNIT_ALREADY_SATISFIED",
                    "目标持仓差额不足最小交易单位，无需重复委托",
                    Decimal::ZERO,
                    current_quantity,
                    None,
                    None,
                    None,
                )
            } else if executable == Decimal::ZERO {
                (
                    "DEFERRED_T_PLUS_ONE",
                    "生产因子持仓动作命中，当前没有可卖数量",
                    Decimal::ZERO,
                    current_quantity,
                    None,
                    None,
                    None,
                )
            } else {
                let quote = quote.ok_or_else(|| {
                    format!("{symbol} missing current execution quote for factor exit")
                })?;
                let (kind, price) = resolve_stock_pool_order_price(
                    rule,
                    symbol,
                    quote.last_price,
                    OrderSide::Sell,
                    stock_pool_instrument_rules(quote)?.price_tick,
                )?;
                estimated_sell_amount += executable * quote.last_price;
                (
                    "READY",
                    if maximum_holding_exits.contains(symbol) {
                        "达到最长持有期，按配置退出"
                    } else if quote_sell_exits.contains(symbol) {
                        "卖出行情条件命中"
                    } else if stop_take_exits.contains(symbol) {
                        "止损/止盈触发，覆盖较弱的减仓目标"
                    } else if constraints.independent_position_target_bps.get(symbol) == Some(target_bps) {
                        "独立风险退出条件命中"
                    } else if *target_bps == 0 {
                        "生产因子退出条件命中"
                    } else {
                        "生产因子减仓条件命中"
                    },
                    -executable,
                    current_quantity - executable,
                    Some(OrderSide::Sell),
                    Some(kind),
                    price,
                )
            };
        rows.push(StockPoolPlanRow {
            symbol: symbol.clone(),
            target_weight_bps: *target_bps as i32,
            target_value: target * quote.map(|value| value.last_price).unwrap_or(Decimal::ZERO),
            current_quantity,
            target_quantity: target,
            delta_quantity: delta,
            side,
            status: status.to_string(),
            reason: reason.to_string(),
            reference_price: quote.map(|value| value.last_price),
            order_type,
            limit_price,
            source_intent: (delta != Decimal::ZERO).then(|| {
                format!(
                    "stock_pool:{generation}:{symbol}:{}",
                    if *target_bps == 0 {
                        "factor_sell"
                    } else {
                        "factor_reduce"
                    }
                )
            }),
        });
    }

    for symbol in &planning_symbols {
        if constraints.frozen_positions.contains_key(symbol) {
            continue;
        }
        if !member_map.contains_key(symbol) {
            return Err(format!("selection symbol {symbol} is missing from members"));
        }
        let current_quantity = current
            .get(symbol)
            .map(|value| value.0)
            .unwrap_or(Decimal::ZERO);
        let closable_quantity = current
            .get(symbol)
            .map(|value| value.1)
            .unwrap_or(current_quantity);
        let quote = quote_map
            .get(symbol)
            .ok_or_else(|| format!("{symbol} missing current execution quote"))?;
        if quote.last_price <= Decimal::ZERO {
            return Err(format!("{symbol} execution quote is invalid"));
        }
        let mut weight = *weights.get(symbol).unwrap_or(&0);
        let forced_exit = stop_take_exits.contains(symbol);
        if forced_exit {
            weight = 0;
        }
        let target_value = protected_values
            .get(symbol)
            .copied()
            .unwrap_or(budget * Decimal::from(weight) / Decimal::from(10_000) * free_scale)
            .round_dp_with_strategy(2, RoundingStrategy::MidpointNearestEven);
        let sizing_price = if target_value >= current_quantity * quote.last_price {
            quote.buy_sizing_price.unwrap_or(quote.last_price)
        } else {
            quote.sell_sizing_price.unwrap_or(quote.last_price)
        };
        if sizing_price <= Decimal::ZERO {
            return Err(format!("{symbol} execution sizing price is invalid"));
        }
        let raw_target = (target_value / sizing_price).floor();
        let (step, minimum_buy) = order_quantity_rules(quote)?;
        let mut target_quantity = current_quantity;
        let mut delta = Decimal::ZERO;
        let mut status = "ALREADY_SATISFIED".to_string();
        let mut reason = "目标仓位已满足".to_string();
        let preserve_existing = !portfolio_policy.rebalance_weights
            && weight > 0
            && target_value > Decimal::ZERO
            && current_quantity > Decimal::ZERO
            && !forced_exit
            && (!constraints.pending_entry_symbols.contains(symbol)
                || raw_target <= current_quantity);
        if preserve_existing {
            if constraints.pending_entry_symbols.contains(symbol) {
                status = "ENTRY_TARGET_ALREADY_SATISFIED".into();
                reason = "本轮建仓目标已满足，后续按配置保留股数".into();
            } else {
                status = "PRESERVED_EXISTING_POSITION".to_string();
                reason = "按配置保留当前持仓，仅调整 Top N 进出名单".to_string();
            }
        } else if raw_target > current_quantity {
            let desired = raw_target - current_quantity;
            let executable = floor_step(desired, step);
            if buy_condition_allowed.get(symbol) == Some(&false) {
                status = "BUY_CONDITION_PENDING".into();
                reason = "买入行情条件尚未满足".into();
            } else if let Some(reasons) = constraints.buy_denials.get(symbol) {
                status = "BUY_FACTOR_BLOCKED".to_string();
                reason = format!("买入因子条件未满足，保留当前持仓: {}", reasons.join("; "));
            } else if normalized_same_day_sold.contains(symbol) {
                status = "BUY_FACTOR_BLOCKED".into();
                reason = "当日已卖出，禁止增加仓位；不因此清仓剩余持仓".into();
            } else if executable < minimum_buy {
                status = "BELOW_MINIMUM_TRADE_UNIT_ALREADY_SATISFIED".to_string();
                reason = if current_quantity == Decimal::ZERO {
                    "目标股数不足该证券首笔最小交易单位，无需生成委托"
                } else {
                    "目标差额不足一个最小交易单位，无需生成委托"
                }
                .to_string();
            } else {
                target_quantity += executable;
                delta = executable;
                status = "READY".to_string();
                reason.clear();
            }
        } else if raw_target < current_quantity {
            let desired = current_quantity - raw_target;
            let executable = if raw_target == Decimal::ZERO {
                closable_quantity
            } else {
                floor_step(desired, step).min(floor_step(closable_quantity, step))
            };
            if executable > Decimal::ZERO {
                target_quantity -= executable;
                delta = -executable;
                status = "READY".to_string();
                reason = if maximum_holding_exits.contains(symbol) {
                    "达到最长持有期，按配置退出".to_string()
                } else if forced_exit {
                    "止损/止盈触发".to_string()
                } else if top_n_demoted_symbols.contains(symbol) {
                    "Top N 优先级调整，移出当前持仓槽位".to_string()
                } else {
                    String::new()
                };
                estimated_sell_amount += executable * quote.last_price;
            } else if closable_quantity < desired {
                status = "DEFERRED_T_PLUS_ONE".to_string();
                reason = "可卖数量不足，剩余减仓顺延到下一交易日".to_string();
            } else {
                status = "BELOW_MINIMUM_TRADE_UNIT_ALREADY_SATISFIED".to_string();
                reason = "目标差额不足一个最小交易单位".to_string();
            }
        }
        let (order_type, limit_price) = if delta == Decimal::ZERO {
            (None, None)
        } else {
            let side = if delta > Decimal::ZERO {
                OrderSide::Buy
            } else {
                OrderSide::Sell
            };
            let (kind, price) = resolve_stock_pool_order_price(
                rule,
                symbol,
                quote.last_price,
                side,
                stock_pool_instrument_rules(quote)?.price_tick,
            )?;
            (Some(kind), price)
        };
        if delta > Decimal::ZERO {
            estimated_buy_amount += delta * limit_price.unwrap_or(quote.last_price);
        }
        rows.push(StockPoolPlanRow {
            symbol: symbol.clone(),
            target_weight_bps: weight,
            target_value,
            current_quantity,
            target_quantity,
            delta_quantity: delta,
            side: (delta != Decimal::ZERO).then(|| {
                if delta > Decimal::ZERO {
                    OrderSide::Buy
                } else {
                    OrderSide::Sell
                }
            }),
            status,
            reason,
            reference_price: Some(sizing_price),
            order_type,
            limit_price,
            source_intent: (delta != Decimal::ZERO).then(|| {
                format!(
                    "stock_pool:{generation}:{symbol}:{}",
                    if delta > Decimal::ZERO { "buy" } else { "sell" }
                )
            }),
        });
    }

    for symbol in &protected_positions {
        if current
            .get(symbol)
            .is_some_and(|position| position.0 > Decimal::ZERO)
            && !rows.iter().any(|row| &row.symbol == symbol)
        {
            let quantity = current[symbol].0;
            let price = quote_map
                .get(symbol)
                .ok_or_else(|| format!("retained position quote missing:{symbol}"))?
                .last_price;
            rows.push(StockPoolPlanRow {
                symbol: symbol.clone(),
                target_weight_bps: 0,
                target_value: quantity * price,
                current_quantity: quantity,
                target_quantity: quantity,
                delta_quantity: Decimal::ZERO,
                side: None,
                status: if sell_condition_denials.contains(symbol) {
                    "SELL_CONDITION_PENDING"
                } else {
                    "AUTOMATIC_TRADE_PROTECTED"
                }
                .into(),
                reason: "持仓保留，继续占用资金与席位".into(),
                reference_price: Some(price),
                order_type: None,
                limit_price: None,
                source_intent: None,
            });
        }
    }
    for row in &mut rows {
        if sell_condition_denials.contains(&row.symbol) && row.delta_quantity <= Decimal::ZERO {
            row.status = "SELL_CONDITION_PENDING".into();
            row.reason = "卖出条件尚未全部满足，保留持仓与席位".into();
            row.target_quantity = row.current_quantity;
            row.delta_quantity = Decimal::ZERO;
            row.side = None;
            row.order_type = None;
            row.limit_price = None;
            row.source_intent = None;
        }
        if let Some(permission) = constraints.automatic_permissions.get(&row.symbol) {
            let denial = if row.delta_quantity < Decimal::ZERO {
                permission.sell_denial
            } else if row.delta_quantity > Decimal::ZERO {
                permission.buy_denial
            } else {
                permission.sell_denial
            };
            if let Some(reason) = denial {
                row.status = "AUTOMATIC_TRADE_PROTECTED".into();
                row.reason = match reason {
                    "automatic_trade_locked" => "锁定区间内保留持仓，不自动买卖",
                    "buy_fill_protection" => "买入成交后保护期内，不自动卖出",
                    "sell_fill_cooldown" => "卖出成交后禁买期内，不自动增加仓位",
                    "maximum_holding_exit" => "达到最长持有期，不再自动加仓",
                    _ => reason,
                }
                .into();
                row.delta_quantity = Decimal::ZERO;
                row.target_quantity = row.current_quantity;
                row.target_value =
                    row.current_quantity * row.reference_price.unwrap_or(Decimal::ZERO);
                row.side = None;
                row.order_type = None;
                row.limit_price = None;
                row.source_intent = None;
            }
        }
    }
    // Verify disjoint planning ownership before an index cap can address rows
    // by symbol. Never deduplicate emitted intentions or count proceeds twice.
    let mut owners = BTreeSet::new();
    for row in &rows {
        if !owners.insert(row.symbol.as_str()) {
            return Err(format!("stock_pool_target_owner_conflict:{}", row.symbol));
        }
    }
    if market_timing.is_some() {
        let caps = index_cap::remaining_index_targets(
            &current,
            &member_map,
            &constraints.automatic_permissions,
            &rows,
            &quote_map,
            &constraints.frozen_positions,
            budget * Decimal::from(requested_weight_total) / Decimal::from(10000),
        )?;
        let mut indices = rows
            .iter()
            .enumerate()
            .map(|(index, row)| (row.symbol.clone(), index))
            .collect::<HashMap<_, _>>();
        for (symbol, cap) in caps {
            let (quantity, closable, _) = current[&symbol];
            let quote = quote_map[&symbol];
            let (step, _) = order_quantity_rules(quote)?;
            let desired = (quantity - cap.quantity).max(Decimal::ZERO);
            let executable = if cap.quantity == Decimal::ZERO {
                closable.min(quantity)
            } else {
                floor_step(desired.min(closable), step)
            };
            let index = if let Some(index) = indices.get(&symbol) {
                *index
            } else {
                let index = rows.len();
                rows.push(StockPoolPlanRow {
                    symbol: symbol.clone(),
                    target_weight_bps: *weights.get(&symbol).unwrap_or(&0),
                    target_value: quantity * quote.last_price,
                    current_quantity: quantity,
                    target_quantity: quantity,
                    delta_quantity: Decimal::ZERO,
                    side: None,
                    status: "ALREADY_SATISFIED".into(),
                    reason: String::new(),
                    reference_price: Some(quote.last_price),
                    order_type: None,
                    limit_price: None,
                    source_intent: None,
                });
                indices.insert(symbol.clone(), index);
                index
            };
            let row = &mut rows[index];
            if executable > Decimal::ZERO {
                row.target_quantity = quantity - executable;
                row.target_value = cap.quantity * quote.last_price;
                row.delta_quantity = -executable;
                row.side = Some(OrderSide::Sell);
                row.status = "READY".into();
                row.reason = "指数总仓位收缩，按剩余持仓比例减仓".into();
                let (kind, price) = resolve_stock_pool_order_price(
                    rule,
                    &symbol,
                    quote.last_price,
                    OrderSide::Sell,
                    stock_pool_instrument_rules(quote)?.price_tick,
                )?;
                row.order_type = Some(kind);
                row.limit_price = price;
                row.source_intent
                    .get_or_insert_with(|| format!("stock_pool:{generation}:{symbol}:sell"));
            } else if cap.blocked_by_t1 {
                row.target_quantity = quantity;
                row.delta_quantity = Decimal::ZERO;
                row.side = None;
                row.order_type = None;
                row.limit_price = None;
                row.source_intent = None;
                row.status = "DEFERRED_T_PLUS_ONE".into();
                row.reason = "指数仓位受可卖数量限制，保留剩余持仓至可交易时处理".into();
            } else if desired > Decimal::ZERO {
                row.target_quantity = quantity;
                row.delta_quantity = Decimal::ZERO;
                row.side = None;
                row.order_type = None;
                row.limit_price = None;
                row.source_intent = None;
                row.status = "BELOW_MINIMUM_TRADE_UNIT_ALREADY_SATISFIED".into();
                row.reason = "指数目标差额不足最小交易单位，无需生成委托".into();
            }
        }
    }
    // Do not authorise buys against proceeds that are not settled yet.  The
    // service may re-preview after the sell batch and then submit the buy leg.
    let available_cash = (account.cash - account.frozen_cash).max(Decimal::ZERO);
    let mut remaining_cash = available_cash;
    let confirmed_position_value = current
        .iter()
        .filter(|(_, row)| row.0 > Decimal::ZERO)
        .map(|(symbol, row)| {
            let price = frozen::valuation(symbol, &quote_map, &constraints.frozen_positions)?;
            Ok(row.0 * price)
        })
        .collect::<Result<Vec<Decimal>, String>>()?
        .into_iter()
        .sum::<Decimal>();
    let mut position_budget = (budget * Decimal::from(requested_weight_total)
        / Decimal::from(10000)
        - confirmed_position_value)
        .max(Decimal::ZERO);
    let mut occupied_position_slots = current.values().filter(|row| row.0 > Decimal::ZERO).count();
    for row in rows
        .iter_mut()
        .filter(|row| row.side == Some(OrderSide::Buy))
    {
        let price = stock_pool_plan_price(row, &quote_map, OrderSide::Buy)?;
        let quote = quote_map
            .get(&row.symbol)
            .ok_or_else(|| format!("{} missing current execution quote", row.symbol))?;
        let (step, minimum_buy) = order_quantity_rules(quote)?;
        let cost = |quantity: Decimal| {
            Ok(quantity * price + fee_for(&row.symbol, OrderSide::Buy, quantity * price)?)
        };
        let own_budget = (row.target_value - row.current_quantity * price).max(Decimal::ZERO);
        let allocation_quantity = max_affordable_buy_quantity_with_cost(
            own_budget,
            row.delta_quantity,
            step,
            minimum_buy,
            &cost,
        )?;
        if allocation_quantity < minimum_buy {
            row.status = "BELOW_MINIMUM_TRADE_UNIT_ALREADY_SATISFIED".into();
            row.reason = "含费用目标预算不足最小交易单位，无需生成委托".into();
            row.side = None;
            row.delta_quantity = Decimal::ZERO;
            row.target_quantity = row.current_quantity;
            continue;
        }
        if row.current_quantity == Decimal::ZERO && occupied_position_slots >= capacity {
            row.status = "DEFERRED_POSITION_SLOTS".into();
            row.reason = "实际持仓席位尚未释放，卖出成交后重新计算买入".into();
            row.side = None;
            row.delta_quantity = Decimal::ZERO;
            row.target_quantity = row.current_quantity;
            continue;
        }
        if cost(minimum_buy)? > position_budget {
            row.status = "DEFERRED_POSITION_BUDGET".into();
            row.reason = "实际持仓仍占用目标资金预算，卖出成交后重新计算买入".into();
            row.side = None;
            row.delta_quantity = Decimal::ZERO;
            row.target_quantity = row.current_quantity;
            continue;
        }
        let max_quantity = max_affordable_buy_quantity_with_cost(
            remaining_cash.min(own_budget).min(position_budget),
            row.delta_quantity,
            step,
            minimum_buy,
            &cost,
        )?;
        if max_quantity < minimum_buy {
            row.status = "BLOCKED_ACCOUNT".to_string();
            row.reason = "可用资金不足以满足该证券首笔最小交易单位".to_string();
            row.side = None;
            row.delta_quantity = Decimal::ZERO;
            row.target_quantity = row.current_quantity;
            continue;
        }
        if max_quantity < row.delta_quantity {
            row.delta_quantity = max_quantity;
            row.target_quantity = row.current_quantity + max_quantity;
            if max_quantity < allocation_quantity {
                row.status = "REDUCE_TO_ALLOWED_QUANTITY".to_string();
                row.reason = "按当前可用资金缩量；卖出资金确认后需重新预览".to_string();
            }
        }
        remaining_cash -= cost(row.delta_quantity)?;
        position_budget -= cost(row.delta_quantity)?;
        if row.current_quantity == Decimal::ZERO {
            occupied_position_slots += 1;
        }
    }
    estimated_buy_amount = rows
        .iter()
        .filter(|row| row.side == Some(OrderSide::Buy))
        .map(|row| {
            let price = stock_pool_plan_price(row, &quote_map, OrderSide::Buy)?;
            Ok(row.delta_quantity * price
                + fee_for(&row.symbol, OrderSide::Buy, row.delta_quantity * price)?)
        })
        .collect::<Result<Vec<Decimal>, String>>()?
        .into_iter()
        .sum();
    estimated_sell_amount = rows
        .iter()
        .filter(|row| row.side == Some(OrderSide::Sell))
        .map(|row| {
            let price = stock_pool_plan_price(row, &quote_map, OrderSide::Sell)?;
            let gross = row.delta_quantity.abs() * price;
            Ok((gross - fee_for(&row.symbol, OrderSide::Sell, gross)?).max(Decimal::ZERO))
        })
        .collect::<Result<Vec<Decimal>, String>>()?
        .into_iter()
        .sum();
    let estimated_cash_after = available_cash - estimated_buy_amount + estimated_sell_amount;
    let position_action_bases = rows.iter()
        .filter(|row| effective_position_targets.get(&row.symbol).is_some_and(|bps| *bps > 0)
            && row.current_quantity > Decimal::ZERO
            && row.status != "AUTOMATIC_TRADE_PROTECTED"
            && !constraints.frozen_positions.contains_key(&row.symbol))
        .map(|row| (row.symbol.clone(), constraints.position_action_bases.get(&row.symbol).copied().unwrap_or(row.current_quantity)))
        .collect();
    Ok(StockPoolPlan {
        position_action_bases,
        market_timing,
        rows,
        budget,
        estimated_buy_amount,
        estimated_sell_amount,
        estimated_cash_after,
        requested_invest_ratio_bps: invest_ratio_bps,
        effective_invest_ratio_bps,
        retained_slots: reserved_protected_slots,
    })
}

fn stock_pool_plan_price(
    row: &StockPoolPlanRow,
    quotes: &HashMap<String, &MarketSnapshot>,
    side: OrderSide,
) -> Result<Decimal, String> {
    let quote = quotes
        .get(&row.symbol)
        .ok_or_else(|| format!("{} execution estimate missing", row.symbol))?;
    let price = row
        .limit_price
        .or(if side == OrderSide::Buy {
            quote.buy_sizing_price
        } else {
            quote.sell_sizing_price
        })
        .unwrap_or(quote.last_price);
    if price <= Decimal::ZERO {
        return Err(format!("{} execution estimate invalid", row.symbol));
    }
    Ok(price)
}

pub fn normalize_stock_pool_members(
    members: &[StockPoolMemberSpec],
) -> Result<Vec<StockPoolMemberSpec>, String> {
    let mut seen = BTreeSet::new();
    let mut result = Vec::with_capacity(members.len());
    for (index, member) in members.iter().enumerate() {
        let symbol = normalize_stock_symbol(&member.symbol)
            .ok_or_else(|| format!("invalid stock pool symbol: {}", member.symbol))?;
        if !seen.insert(symbol.clone()) {
            return Err(format!("stock pool contains duplicate symbol: {symbol}"));
        }
        if let Some(weight) = member.target_weight_bps
            && !(0..=10_000).contains(&weight)
        {
            return Err(format!("{symbol}.target_weight_bps is out of range"));
        }
        for (name, ratio) in [
            ("stop_loss", member.stop_loss),
            ("take_profit", member.take_profit),
        ] {
            if let Some(value) = ratio
                && (value < Decimal::ZERO || value >= Decimal::ONE)
            {
                return Err(format!("{symbol}.{name} is out of range"));
            }
        }
        let recommendation_reason = member.recommendation_reason.trim().to_string();
        if recommendation_reason.chars().count() > 1000 {
            return Err(format!(
                "{symbol}.recommendation_reason exceeds 1000 characters"
            ));
        }
        let mut normalized = member.clone();
        normalized.symbol = symbol;
        normalized.requested_order = index as i32;
        normalized.recommendation_reason = recommendation_reason;
        result.push(normalized);
    }
    let explicit = result
        .iter()
        .filter_map(|item| item.target_weight_bps)
        .collect::<Vec<_>>();
    if !explicit.is_empty() && explicit.len() != result.len() {
        return Err("explicit stock pool weights must be set for every member".to_string());
    }
    if explicit.iter().sum::<i32>() > 10_000 {
        return Err("stock pool weights exceed 10000 bps".to_string());
    }
    Ok(result)
}

pub fn normalize_stock_symbol(raw: &str) -> Option<String> {
    let mut value = raw.trim().to_ascii_uppercase();
    for (from, to) in [
        (".XSHG", ".SH"),
        (".XSHE", ".SZ"),
        (".SHSE", ".SH"),
        (".SZSE", ".SZ"),
        (".BJSE", ".BJ"),
        (".XBE", ".BJ"),
    ] {
        value = value.replace(from, to);
    }
    if !value.contains('.') && value.len() == 6 && value.chars().all(|ch| ch.is_ascii_digit()) {
        let suffix = if ["600", "601", "603", "605", "688", "689"]
            .iter()
            .any(|prefix| value.starts_with(prefix))
        {
            ".SH"
        } else if ["000", "001", "002", "003", "300", "301"]
            .iter()
            .any(|prefix| value.starts_with(prefix))
        {
            ".SZ"
        } else if ["43", "83", "87", "88", "92"]
            .iter()
            .any(|prefix| value.starts_with(prefix))
        {
            ".BJ"
        } else {
            ""
        };
        value.push_str(suffix);
    }
    let (code, exchange) = value.split_once('.')?;
    if code.len() != 6
        || !code.chars().all(|ch| ch.is_ascii_digit())
        || !matches!(exchange, "SH" | "SZ" | "BJ")
    {
        return None;
    }
    Some(format!("{code}.{exchange}"))
}

fn normalize_symbol_list(values: &[String]) -> Result<Vec<String>, String> {
    let mut result = Vec::new();
    let mut seen = BTreeSet::new();
    for value in values {
        if let Some(symbol) = normalize_stock_symbol(value) {
            if seen.insert(symbol.clone()) {
                result.push(symbol);
            }
        } else if !value.trim().is_empty() {
            return Err(format!("invalid stock pool symbol: {value}"));
        }
    }
    Ok(result)
}

fn normalize_symbol_set(values: &[String]) -> Result<BTreeSet<String>, String> {
    Ok(normalize_symbol_list(values)?.into_iter().collect())
}

pub fn stock_pool_execution_quote_symbols(
    requested_symbols: &[String],
    positions: &[Position],
) -> Vec<String> {
    let mut symbols = requested_symbols
        .iter()
        .filter_map(|symbol| normalize_stock_symbol(symbol))
        .collect::<BTreeSet<_>>();
    symbols.extend(
        positions
            .iter()
            .filter(|position| position.quantity > Decimal::ZERO)
            .filter_map(|position| normalize_stock_symbol(&position.symbol)),
    );
    symbols.into_iter().collect()
}

pub fn resolve_stock_pool_order_price(
    rule: &StockPoolExecutionRule,
    symbol: &str,
    reference_price: Decimal,
    side: OrderSide,
    price_tick: Decimal,
) -> Result<(String, Option<Decimal>), String> {
    if reference_price <= Decimal::ZERO || price_tick <= Decimal::ZERO || price_tick > Decimal::ONE
    {
        return Err(format!("{symbol} reference price is invalid"));
    }
    let symbol =
        normalize_stock_symbol(symbol).ok_or_else(|| format!("invalid symbol {symbol}"))?;
    match rule.pricing_mode.as_str() {
        POOL_PRICE_FIRST_TICK | POOL_PRICE_CONDITION_THEN_MARKET => {
            Ok(("market".to_string(), None))
        }
        POOL_PRICE_FIXED_LIMIT => {
            let price = rule
                .fixed_prices
                .get(&symbol)
                .copied()
                .or(rule.fixed_price)
                .ok_or_else(|| format!("fixed_limit pricing has no price for {symbol}"))?;
            if price <= Decimal::ZERO || (price / price_tick).fract() != Decimal::ZERO {
                return Err(format!(
                    "fixed_limit price for {symbol} is not aligned with price_tick={price_tick}"
                ));
            }
            Ok(("limit".to_string(), Some(price)))
        }
        POOL_PRICE_OPENING_AUCTION | POOL_PRICE_FORMULA_LIMIT | POOL_PRICE_CONDITION_THEN_LIMIT => {
            let offset = if side == OrderSide::Buy {
                rule.buy_offset_bps
            } else {
                rule.sell_offset_bps
            };
            let raw_price =
                reference_price * (Decimal::ONE + Decimal::from(offset) / Decimal::from(10_000));
            let price = if side == OrderSide::Buy {
                (raw_price / price_tick).ceil() * price_tick
            } else {
                (raw_price / price_tick).floor() * price_tick
            };
            if price <= Decimal::ZERO {
                return Err(format!("{symbol} protection price is invalid"));
            }
            Ok(("limit".to_string(), Some(price)))
        }
        mode => Err(format!("stock pool pricing_mode={mode} is not supported")),
    }
}

fn floor_step(value: Decimal, step: Decimal) -> Decimal {
    if value <= Decimal::ZERO || step <= Decimal::ZERO {
        return Decimal::ZERO;
    }
    (value / step).floor() * step
}

fn commission_for_notional(
    notional: Decimal,
    commission_rate: Decimal,
    minimum_commission: Decimal,
) -> Decimal {
    if notional <= Decimal::ZERO {
        return Decimal::ZERO;
    }
    (notional * commission_rate).max(minimum_commission)
}

fn max_affordable_buy_quantity_with_cost(
    cash: Decimal,
    requested: Decimal,
    step: Decimal,
    minimum: Decimal,
    cost: &dyn Fn(Decimal) -> Result<Decimal, String>,
) -> Result<Decimal, String> {
    if cash <= Decimal::ZERO || requested <= Decimal::ZERO || step <= Decimal::ZERO {
        return Ok(Decimal::ZERO);
    }
    let mut low = Decimal::ZERO;
    let mut high = floor_step(requested, step);
    while high - low > step {
        let mut mid = floor_step((low + high) / Decimal::from(2), step);
        if mid <= low {
            mid = low + step;
        }
        if mid >= minimum && cost(mid)? <= cash {
            low = mid;
        } else {
            high = mid - step;
        }
    }
    Ok(if high >= minimum && cost(high)? <= cash {
        high
    } else if low >= minimum && cost(low)? <= cash {
        low
    } else {
        Decimal::ZERO
    })
}

fn order_quantity_rules(snapshot: &MarketSnapshot) -> Result<(Decimal, Decimal), String> {
    let rules = stock_pool_instrument_rules(snapshot)?;
    Ok((rules.quantity_step, rules.minimum_buy_quantity))
}

pub fn normalize_stock_pool_execution_rule(
    raw: Option<&Value>,
    secondary_buy_condition: bool,
    secondary_sell_condition: bool,
) -> Result<StockPoolExecutionRule, String> {
    normalize_stock_pool_execution_rule_with_exit_roles(raw, secondary_buy_condition, secondary_sell_condition, false)
}

pub fn normalize_stock_pool_execution_rule_with_exit_roles(
    raw: Option<&Value>,
    secondary_buy_condition: bool,
    secondary_sell_condition: bool,
    independent_sell_condition: bool,
) -> Result<StockPoolExecutionRule, String> {
    let mut rule = match raw {
        None | Some(Value::Null) => StockPoolExecutionRule::default(),
        Some(value) => serde_json::from_value::<StockPoolExecutionRule>(value.clone())
            .map_err(|err| format!("stock pool execution_rule is invalid: {err}"))?,
    };
    rule.secondary_sell_condition = secondary_sell_condition;
    rule.independent_sell_condition = independent_sell_condition;
    rule.automatic_trade_protection.validate()?;
    if rule.schema_version != STOCK_POOL_SCHEMA_VERSION {
        return Err(format!(
            "stock pool execution_rule.schema_version must be {}",
            STOCK_POOL_SCHEMA_VERSION
        ));
    }
    if !matches!(
        rule.trigger_mode.as_str(),
        POOL_TRIGGER_FIRST_TICK
            | POOL_TRIGGER_TIME_WINDOW
            | POOL_TRIGGER_CONDITION
            | POOL_TRIGGER_SCHEDULED_BAR
    ) {
        return Err(format!(
            "stock pool trigger_mode={} is not supported",
            rule.trigger_mode
        ));
    }
    if !matches!(
        rule.pricing_mode.as_str(),
        POOL_PRICE_FIRST_TICK
            | POOL_PRICE_OPENING_AUCTION
            | POOL_PRICE_FIXED_LIMIT
            | POOL_PRICE_FORMULA_LIMIT
            | POOL_PRICE_CONDITION_THEN_LIMIT
            | POOL_PRICE_CONDITION_THEN_MARKET
    ) {
        return Err(format!(
            "stock pool pricing_mode={} is not supported",
            rule.pricing_mode
        ));
    }
    if rule.pricing_mode == POOL_PRICE_OPENING_AUCTION {
        return Err(
            "stock pool opening_auction pricing requires a verified auction quote and is not available"
                .to_string(),
        );
    }
    if !matches!(
        rule.sell_trigger_mode.as_str(),
        POOL_SELL_TARGET_DELTA | POOL_SELL_CONDITION
    ) {
        return Err(format!(
            "stock pool sell_trigger_mode={} is not supported",
            rule.sell_trigger_mode
        ));
    }
    for (name, value) in [
        ("freeze_time", rule.freeze_time.as_str()),
        ("window_start", rule.window_start.as_str()),
        ("window_end", rule.window_end.as_str()),
    ] {
        if !is_hhmm(value) {
            return Err(format!("stock pool {name} must use HH:MM"));
        }
    }
    if rule.freeze_time > rule.window_start || rule.window_start >= rule.window_end {
        return Err("stock pool execution window is not ordered".to_string());
    }
    if rule.trigger_mode != POOL_TRIGGER_SCHEDULED_BAR {
        let start = parse_hhmm_minutes(&rule.window_start).expect("validated HH:MM");
        let end = parse_hhmm_minutes(&rule.window_end).expect("validated HH:MM");
        if !(start..end).any(stock_pool_is_trading_minute) {
            return Err(
                "stock pool execution window has no continuous trading minutes".to_string(),
            );
        }
    }
    if rule.trigger_mode == POOL_TRIGGER_CONDITION
        || rule.pricing_mode == POOL_PRICE_CONDITION_THEN_LIMIT
        || rule.pricing_mode == POOL_PRICE_CONDITION_THEN_MARKET
    {
        if rule.buy_condition.trim().is_empty() && !secondary_buy_condition {
            return Err(
                "stock pool condition trigger requires a buy quote, factor or event condition"
                    .to_string(),
            );
        }
    }
    if !rule.buy_condition.trim().is_empty()
        && parse_stock_pool_condition(&rule.buy_condition).is_none()
    {
        return Err("stock pool buy_condition is not supported".to_string());
    }
    if rule.sell_trigger_mode == POOL_SELL_CONDITION {
        if (rule.sell_condition.trim().is_empty() && !secondary_sell_condition && !independent_sell_condition)
            || (!rule.sell_condition.trim().is_empty()
                && parse_stock_pool_condition(&rule.sell_condition).is_none())
        {
            return Err(
                "stock pool condition sell mode requires a supported sell_condition".to_string(),
            );
        }
    } else if !rule.sell_condition.trim().is_empty() {
        return Err("sell_condition requires sell_trigger_mode=condition".to_string());
    }
    if rule.pricing_mode == POOL_PRICE_FIXED_LIMIT
        && rule.fixed_price.is_none()
        && rule.fixed_prices.is_empty()
    {
        return Err("fixed_limit pricing requires fixed_price or fixed_prices".to_string());
    }
    let mut normalized_fixed_prices = BTreeMap::new();
    for (symbol, price) in &rule.fixed_prices {
        let Some(normalized_symbol) = normalize_stock_symbol(symbol) else {
            return Err(format!("fixed_prices contains invalid value for {symbol}"));
        };
        if *price <= Decimal::ZERO {
            return Err(format!("fixed_prices contains invalid value for {symbol}"));
        }
        normalized_fixed_prices.insert(normalized_symbol, *price);
    }
    rule.fixed_prices = normalized_fixed_prices;
    if let Some(price) = rule.fixed_price {
        if price <= Decimal::ZERO {
            return Err("fixed_price must be positive".to_string());
        }
    }
    if !matches!(rule.time_in_force.to_ascii_uppercase().as_str(), "DAY") {
        return Err("stock pool time_in_force currently only supports DAY".to_string());
    }
    if !matches!(
        rule.missed_window_policy.as_str(),
        "reject" | "intraday_catchup"
    ) {
        return Err("stock pool missed_window_policy is not supported".to_string());
    }
    if !(1..=1).contains(&rule.max_child_orders) {
        return Err("stock pool max_child_orders must be 1".to_string());
    }
    if !(-9999..=9999).contains(&rule.buy_offset_bps)
        || !(-9999..=9999).contains(&rule.sell_offset_bps)
    {
        return Err("stock pool price offset is out of range".to_string());
    }
    rule.time_in_force = rule.time_in_force.to_ascii_uppercase();
    rule.buy_condition = rule.buy_condition.trim().to_string();
    rule.sell_condition = rule.sell_condition.trim().to_string();
    Ok(rule)
}

fn is_hhmm(value: &str) -> bool {
    let bytes = value.as_bytes();
    bytes.len() == 5
        && bytes[2] == b':'
        && bytes[0..2].iter().all(u8::is_ascii_digit)
        && bytes[3..5].iter().all(u8::is_ascii_digit)
        && value[0..2].parse::<u8>().is_ok_and(|hour| hour < 24)
        && value[3..5].parse::<u8>().is_ok_and(|minute| minute < 60)
}

pub fn parse_stock_pool_condition(value: &str) -> Option<(String, String, String, Decimal)> {
    let text = value.trim();
    let (scope, expression) = text
        .split_once(':')
        .map_or(("all", text), |(scope, expression)| (scope, expression));
    // Legacy `all:` meant per-symbol evaluation. Preserve it; actual
    // aggregation is the explicit buy/sell_condition_scope contract.
    if !scope.eq_ignore_ascii_case("all") {
        return None;
    }
    let operators = [">=", "<=", "==", "!=", ">", "<"];
    let (field, operator, threshold) = operators.iter().find_map(|operator| {
        let index = expression.find(operator)?;
        Some((
            expression[..index].trim(),
            *operator,
            expression[index + operator.len()..].trim(),
        ))
    })?;
    if !matches!(
        field.to_ascii_lowercase().as_str(),
        "price" | "last" | "change_pct" | "volume" | "amount" | "bid1" | "ask1"
    ) {
        return None;
    }
    let value = threshold.parse::<Decimal>().ok()?;
    if (!field.eq_ignore_ascii_case("change_pct") && value < Decimal::ZERO)
        || (field.eq_ignore_ascii_case("volume") && value.fract() != Decimal::ZERO)
    {
        return None;
    }
    Some((
        scope.to_ascii_lowercase(),
        field.to_ascii_lowercase(),
        operator.to_string(),
        value,
    ))
}

fn parse_hhmm_minutes(value: &str) -> Option<u32> {
    Some(value[0..2].parse::<u32>().ok()? * 60 + value[3..5].parse::<u32>().ok()?)
}

pub fn stock_pool_is_trading_minute(minute: u32) -> bool {
    (9 * 60 + 30..11 * 60 + 30).contains(&minute) || (13 * 60..15 * 60 + 31).contains(&minute)
}

pub fn stock_pool_condition_matches(
    condition: &str,
    quote: &MarketSnapshot,
) -> Result<bool, String> {
    let Some((_scope, field, operator, threshold)) = parse_stock_pool_condition(condition) else {
        return Err("stock pool condition is not supported".to_string());
    };
    let observed = match field.as_str() {
        "price" | "last" => quote.last_price,
        "change_pct" => quote
            .prev_close
            .filter(|value| *value > Decimal::ZERO)
            .map(|prev| (quote.last_price / prev - Decimal::ONE) * Decimal::from(100))
            .ok_or_else(|| "condition requires prev_close".to_string())?,
        "volume" => quote
            .volume
            .ok_or_else(|| "condition requires volume".to_string())?,
        "amount" => quote
            .turnover
            .ok_or_else(|| "condition requires amount".to_string())?,
        "bid1" => quote
            .bid_price_1
            .ok_or_else(|| "condition requires bid1".to_string())?,
        "ask1" => quote
            .ask_price_1
            .ok_or_else(|| "condition requires ask1".to_string())?,
        _ => return Err("stock pool condition field is not supported".to_string()),
    };
    if (matches!(field.as_str(), "price" | "last" | "bid1" | "ask1") && observed <= Decimal::ZERO)
        || (matches!(field.as_str(), "volume" | "amount") && observed < Decimal::ZERO)
        || (field == "change_pct" && quote.last_price <= Decimal::ZERO)
    {
        return Err(format!("condition requires valid {field}"));
    }
    Ok(match operator.as_str() {
        ">=" => observed >= threshold,
        "<=" => observed <= threshold,
        "==" => observed == threshold,
        "!=" => observed != threshold,
        ">" => observed > threshold,
        "<" => observed < threshold,
        _ => false,
    })
}

fn quote_condition_results(
    condition: &str,
    scope: Option<QuoteConditionScope>,
    symbols: &[String],
    quotes: &HashMap<String, &MarketSnapshot>,
) -> Result<BTreeMap<String, bool>, String> {
    if condition.trim().is_empty() {
        return Ok(symbols
            .iter()
            .map(|symbol| (symbol.clone(), true))
            .collect());
    }
    let values = symbols
        .iter()
        .map(|symbol| {
            let quote = quotes
                .get(symbol)
                .ok_or_else(|| format!("quote condition facts missing:{symbol}"))?;
            Ok((
                symbol.clone(),
                stock_pool_condition_matches(condition, quote)?,
            ))
        })
        .collect::<Result<BTreeMap<_, _>, String>>()?;
    let aggregate = match scope.unwrap_or_default() {
        QuoteConditionScope::PerSymbol => return Ok(values),
        QuoteConditionScope::AllTargets => {
            !values.is_empty() && values.values().all(|value| *value)
        }
        QuoteConditionScope::AnyTarget => values.values().any(|value| *value),
    };
    Ok(symbols
        .iter()
        .map(|symbol| (symbol.clone(), aggregate))
        .collect())
}

#[cfg(test)]
#[path = "stock_pool_execution_tests.rs"]
mod tests;

#[path = "stock_pool_frozen.rs"]
mod frozen;
#[path = "stock_pool_index_cap.rs"]
mod index_cap;