//! Read and validate a saved acceptance fixture without rewriting its source.
//! cargo run --locked -p oa-core --example attachment_snapshot -- input.arcadia output.json
use oa_core::{persistence, validate_candidate};
use std::{fs::OpenOptions, io::Write, path::Path};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args: Vec<_> = std::env::args_os().skip(1).collect();
    if args.len() != 2 {
        return Err("Expected input source/JSON and a new output JSON path".into());
    }
    let project = persistence::load(Path::new(&args[0]))?;
    validate_candidate(&project)?;
    let bytes = serde_json::to_vec_pretty(&project)?;
    let mut output = OpenOptions::new()
        .write(true)
        .create_new(true)
        .open(&args[1])?;
    output.write_all(&bytes)?;
    output.write_all(b"\n")?;
    output.sync_all()?;
    println!(
        "Validated {} objects and {} views; saved a complete Project snapshot",
        project.identities().len(),
        project.diagrams.len()
    );
    Ok(())
}