use engine::mock_db::create_mock_db;
use engine::{create_heromodels_engine, eval_file};
use rhai::Engine;

mod mock;
use mock::seed_calendar_data;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    println!("Calendar Rhai Example");
    println!("=====================");

    // Create a mock database
    let db = create_mock_db();

    // Seed the database with some initial data
    seed_calendar_data(db.clone());

    // Create the Rhai engine using our central engine creator
    let mut engine = create_heromodels_engine(db.clone());

    // Register timestamp helper functions
    register_timestamp_helpers(&mut engine);

    // Get the path to the script
    let manifest_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    let script_path = manifest_dir
        .join("examples")
        .join("calendar")
        .join("calendar_script.rhai");

    println!("\nRunning script: {}", script_path.display());
    println!("---------------------");

    // Run the script
    match eval_file(&engine, &script_path) {
        Ok(result) => {
            if !result.is_unit() {
                println!("\nScript returned: {:?}", result);
            }
            println!("\nScript executed successfully!");
            Ok(())
        }
        Err(err) => {
            eprintln!("\nError running script: {}", err);
            Err(Box::new(std::io::Error::new(
                std::io::ErrorKind::Other,
                err.to_string(),
            )))
        }
    }
}

// Register timestamp helper functions with the engine
fn register_timestamp_helpers(engine: &mut Engine) {
    use chrono::{TimeZone, Utc};

    // Function to get current timestamp
    engine.register_fn("timestamp_now", || Utc::now().timestamp() as i64);

    // Function to format a timestamp
    engine.register_fn("format_timestamp", |ts: i64| {
        let dt = Utc
            .timestamp_opt(ts, 0)
            .single()
            .expect("Invalid timestamp");
        dt.format("%Y-%m-%d %H:%M:%S UTC").to_string()
    });

    println!("Timestamp helper functions registered successfully.");
}