use actix_cors::Cors;
use actix_session::{SessionMiddleware, storage::CookieSessionStore};
use actix_web::{App, HttpServer, cookie::Key, web};
use clap::Parser;
use tracing_actix_web::TracingLogger;
use tracing_subscriber::EnvFilter;

use shanty_data::MusicBrainzFetcher;
use shanty_data::WikipediaFetcher;
use shanty_db::Database;
use shanty_search::MusicBrainzSearch;

use shanty_web::config::AppConfig;
use shanty_web::routes;
use shanty_web::state::AppState;
use shanty_web::tasks::TaskManager;

#[derive(Parser)]
#[command(name = "shanty-web", about = "Shanty web interface backend")]
struct Cli {
    /// Path to config file.
    #[arg(long, env = "SHANTY_CONFIG")]
    config: Option<String>,

    /// Override the port.
    #[arg(long)]
    port: Option<u16>,

    /// Increase verbosity (-v info, -vv debug, -vvv trace).
    #[arg(short, long, action = clap::ArgAction::Count)]
    verbose: u8,
}

#[actix_web::main]
async fn main() -> anyhow::Result<()> {
    let cli = Cli::parse();

    let filter = match cli.verbose {
        0 => "info,shanty_web=info",
        1 => "info,shanty_web=debug",
        _ => "debug,shanty_web=trace",
    };
    tracing_subscriber::fmt()
        .with_env_filter(
            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(filter)),
        )
        .init();

    let mut config = AppConfig::load(cli.config.as_deref());
    if let Some(port) = cli.port {
        config.web.port = port;
    }

    tracing::info!(url = %config.database_url, "connecting to database");
    let db = Database::new(&config.database_url).await?;

    let mb_client = MusicBrainzFetcher::new()?;
    let search = MusicBrainzSearch::new()?;
    let wiki_fetcher = WikipediaFetcher::new()?;

    let bind = format!("{}:{}", config.web.bind, config.web.port);
    tracing::info!(bind = %bind, "starting server");

    let config_path = cli.config.clone();
    let state = web::Data::new(AppState {
        db,
        mb_client,
        search,
        wiki_fetcher,
        config: std::sync::Arc::new(tokio::sync::RwLock::new(config)),
        config_path,
        tasks: TaskManager::new(),
        firefox_login: tokio::sync::Mutex::new(None),
        scheduler: tokio::sync::Mutex::new(shanty_web::state::SchedulerInfo {
            next_pipeline: None,
            next_monitor: None,
        }),
    });

    // Start background cookie refresh task
    shanty_web::cookie_refresh::spawn(state.config.clone());

    // Start pipeline and monitor schedulers
    shanty_web::pipeline_scheduler::spawn(state.clone());
    shanty_web::monitor::spawn(state.clone());

    // Resolve static files directory relative to the binary location
    let static_dir = std::env::current_exe()
        .ok()
        .and_then(|exe| exe.parent().map(|p| p.to_owned()))
        .map(|p| p.join("static"))
        .unwrap_or_else(|| std::path::PathBuf::from("static"));

    // Also check next to the crate root (for development)
    let static_dir = if static_dir.is_dir() {
        static_dir
    } else {
        let dev_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("static");
        if dev_path.is_dir() {
            dev_path
        } else {
            tracing::warn!("static directory not found — frontend will not be served");
            static_dir
        }
    };
    tracing::info!(path = %static_dir.display(), "serving static files");

    let session_key = Key::generate();

    HttpServer::new(move || {
        let cors = Cors::permissive();
        let static_dir = static_dir.clone();

        App::new()
            .wrap(cors)
            .wrap(
                SessionMiddleware::builder(CookieSessionStore::default(), session_key.clone())
                    .cookie_secure(false)
                    .build(),
            )
            .wrap(TracingLogger::default())
            .app_data(state.clone())
            .configure(routes::configure)
            .service(
                actix_files::Files::new("/", static_dir.clone())
                    .index_file("index.html")
                    .prefer_utf8(true),
            )
            // SPA fallback: serve index.html for any route not matched
            // by API or static files, so client-side routing works on refresh
            .default_service(web::to({
                let index_path = static_dir.join("index.html");
                move |req: actix_web::HttpRequest| {
                    let index_path = index_path.clone();
                    async move {
                        actix_files::NamedFile::open_async(index_path)
                            .await
                            .map(|f| f.into_response(&req))
                    }
                }
            }))
    })
    .bind(&bind)?
    .run()
    .await?;

    Ok(())
}