use std::io::{self,Read};

fn main() -> Result<(),Box<dyn std::error::Error>> {
    let mut input=String::new();
    io::stdin().read_to_string(&mut input)?;
    let book:fidc_core::signal_contract::SignalBook=serde_json::from_str(&input)?;
    let version=book.version_sha256.clone();
    let snapshots=book.snapshots.len();
    let validated=book.validate().map_err(io::Error::other)?;
    println!("{}",serde_json::json!({"ok":true,"versionSha256":version,"snapshots":snapshots,
        "symbols":validated.symbols().len(),"observed":validated.require_observed().is_ok()}));
    Ok(())
}