mod agents;
mod config;
mod http;
mod io;
mod llm;
mod state;
mod store;
mod workflow;
mod worktree;

use crate::agents::AgentPool;
use crate::http::build_routes;
use crate::http::context::AppContext;
use crate::state::SessionState;
use crate::store::JsonFileStore;
use crate::workflow::WorkflowState;
use poem::Server;
use poem::listener::TcpListener;
use std::path::{Path, PathBuf};
use std::sync::Arc;

const DEFAULT_PORT: u16 = 3001;

fn parse_port(value: Option<String>) -> u16 {
    value
        .and_then(|v| v.parse::<u16>().ok())
        .unwrap_or(DEFAULT_PORT)
}

fn resolve_port() -> u16 {
    parse_port(std::env::var("STORYKIT_PORT").ok())
}

fn write_port_file(dir: &Path, port: u16) -> Option<PathBuf> {
    let path = dir.join(".story_kit_port");
    std::fs::write(&path, port.to_string()).ok()?;
    Some(path)
}

fn remove_port_file(path: &Path) {
    let _ = std::fs::remove_file(path);
}

#[tokio::main]
async fn main() -> Result<(), std::io::Error> {
    let app_state = Arc::new(SessionState::default());
    let cwd = std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."));
    *app_state.project_root.lock().unwrap() = Some(cwd.clone());
    let store = Arc::new(
        JsonFileStore::from_path(PathBuf::from("store.json")).map_err(std::io::Error::other)?,
    );
    let workflow = Arc::new(std::sync::Mutex::new(WorkflowState::default()));
    let port = resolve_port();
    let agents = Arc::new(AgentPool::new(port));

    let ctx = AppContext {
        state: app_state,
        store,
        workflow,
        agents,
    };

    let app = build_routes(ctx);
    let addr = format!("127.0.0.1:{port}");

    println!(
        "\x1b[95;1m  ____  _             _    ___ _   \n / ___|| |_ ___  _ __| | _|_ _| |_ \n \\___ \\| __/ _ \\| '__| |/ /| || __|\n  ___) | || (_) | |  |   < | || |_ \n |____/ \\__\\___/|_|  |_|\\_\\___|\\__|\n\x1b[0m"
    );
    println!("STORYKIT_PORT={port}");
    println!("\x1b[96;1mFrontend:\x1b[0m \x1b[94mhttp://{addr}\x1b[0m");
    println!("\x1b[92;1mOpenAPI Docs:\x1b[0m \x1b[94mhttp://{addr}/docs\x1b[0m");

    // Validate agent config at startup — panic on invalid project.toml.
    config::ProjectConfig::load(&cwd)
        .unwrap_or_else(|e| panic!("Invalid project.toml: {e}"));

    let port_file = write_port_file(&cwd, port);

    let result = Server::new(TcpListener::bind(&addr)).run(app).await;

    if let Some(ref path) = port_file {
        remove_port_file(path);
    }

    result
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse_port_defaults_to_3001() {
        assert_eq!(parse_port(None), 3001);
    }

    #[test]
    fn parse_port_reads_valid_value() {
        assert_eq!(parse_port(Some("4200".to_string())), 4200);
    }

    #[test]
    fn parse_port_ignores_invalid_value() {
        assert_eq!(parse_port(Some("not_a_number".to_string())), 3001);
    }

    #[test]
    #[should_panic(expected = "Invalid project.toml: Duplicate agent name")]
    fn panics_on_duplicate_agent_names() {
        let tmp = tempfile::tempdir().unwrap();
        let sk = tmp.path().join(".story_kit");
        std::fs::create_dir_all(&sk).unwrap();
        std::fs::write(
            sk.join("project.toml"),
            r#"
[[agent]]
name = "coder"

[[agent]]
name = "coder"
"#,
        )
        .unwrap();

        config::ProjectConfig::load(tmp.path())
            .unwrap_or_else(|e| panic!("Invalid project.toml: {e}"));
    }

    #[test]
    fn write_and_remove_port_file() {
        let tmp = tempfile::tempdir().unwrap();

        let path = write_port_file(tmp.path(), 4567).expect("should write port file");
        assert_eq!(std::fs::read_to_string(&path).unwrap(), "4567");

        remove_port_file(&path);
        assert!(!path.exists());
    }
}