use crate::api::endpoints::hdhomerun_api::hdhr_api_register;
use crate::api::endpoints::hls_api::hls_api_register;
use crate::api::endpoints::m3u_api::m3u_api_register;
use crate::api::endpoints::v1_api::v1_api_register;
use crate::api::endpoints::web_index::{index_register_with_path, index_register_without_path};
use crate::api::endpoints::xmltv_api::xmltv_api_register;
use crate::api::endpoints::xtream_api::xtream_api_register;
use crate::api::model::active_provider_manager::ActiveProviderManager;
use crate::api::model::active_user_manager::ActiveUserManager;
use crate::api::model::app_state::{create_cache, create_http_client, AppState, CancelTokens, HdHomerunAppState};
use crate::api::model::download::DownloadQueue;
use crate::api::model::streams::shared_stream_manager::SharedStreamManager;
use crate::api::scheduler::{exec_scheduler};
use crate::model::{AppConfig, Config, ProcessTargets, RateLimitConfig};
use crate::model::{Healthcheck};
use crate::processing::processor::playlist;
use log::{error, info};
use std::io::ErrorKind;
use std::path::PathBuf;
use std::sync::Arc;
use arc_swap::{ArcSwap, ArcSwapOption};
use axum::Router;
use tokio_util::sync::CancellationToken;
use tower_governor::key_extractor::SmartIpKeyExtractor;
use crate::api::api_utils::{get_build_time, get_server_time};
use crate::api::config_watch::exec_config_watch;
use crate::api::serve::serve;
use crate::VERSION;

fn get_web_dir_path(web_ui_enabled: bool, web_root: &str) -> Result<PathBuf, std::io::Error> {
    let web_dir = web_root.to_string();
    let web_dir_path = PathBuf::from(&web_dir);
    if web_ui_enabled && (!&web_dir_path.exists() || !&web_dir_path.is_dir()) {
        return Err(std::io::Error::new(ErrorKind::NotFound,
                                       format!("web_root does not exists or is not an directory: {}", web_dir_path.display())));
    }
    Ok(web_dir_path)
}


fn create_healthcheck() -> Healthcheck {
    Healthcheck {
        status: "ok".to_string(),
        version: VERSION.to_string(),
        build_time: get_build_time(),
        server_time: get_server_time(),
    }
}

async fn healthcheck() -> impl axum::response::IntoResponse {
    axum::Json(create_healthcheck())
}

fn create_shared_data(app_config: &Arc<AppConfig>, forced_targets: &Arc<ProcessTargets>) -> AppState {
    let config = app_config.config.load();
    let cache = create_cache(&config);
    let active_users = Arc::new(ActiveUserManager::new(&config));
    let active_provider = Arc::new(ActiveProviderManager::new(app_config));
    let client = create_http_client(app_config);

    AppState {
        forced_targets: Arc::new(ArcSwap::new(Arc::clone(forced_targets))),
        app_config: Arc::clone(app_config),
        http_client: Arc::new(ArcSwap::from_pointee(client)),
        downloads: Arc::new(DownloadQueue::new()),
        cache: Arc::new(ArcSwapOption::from(cache)),
        shared_stream_manager: Arc::new(SharedStreamManager::new()),
        active_users,
        active_provider,
        cancel_tokens: Arc::new(ArcSwap::from_pointee(CancelTokens::default())),
    }
}

fn exec_update_on_boot(client: Arc<reqwest::Client>, cfg: &Arc<AppConfig>, targets: &Arc<ProcessTargets>) {
    let config = cfg.config.load();
    if config.update_on_boot {
        let cfg_clone = Arc::clone(cfg);
        let targets_clone = Arc::clone(targets);
        tokio::spawn(
            async move { playlist::exec_processing(client, cfg_clone, targets_clone).await }
        );
    }
}


fn is_web_auth_enabled(cfg: &Arc<Config>, web_ui_enabled: bool) -> bool {
    if web_ui_enabled {
        if let Some(web_auth) = &cfg.web_ui.as_ref().and_then(|c| c.auth.as_ref()) {
            return web_auth.enabled;
        }
    }
    false
}

fn create_cors_layer() -> tower_http::cors::CorsLayer {
    tower_http::cors::CorsLayer::new()
        // .allow_credentials(true)
        .allow_origin(tower_http::cors::Any)
        .allow_methods([axum::http::Method::GET, axum::http::Method::POST, axum::http::Method::OPTIONS, axum::http::Method::HEAD])
        .allow_headers(tower_http::cors::Any)
        .max_age(std::time::Duration::from_secs(3600))
}
fn create_compression_layer() -> tower_http::compression::CompressionLayer {
    tower_http::compression::CompressionLayer::new()
        .br(true)
        .deflate(true)
        .gzip(true)
        .zstd(true)
}

pub(in crate::api) fn start_hdhomerun(app_config: &Arc<AppConfig>, app_state: &Arc<AppState>, infos: &mut Vec<String>,
                                      cancel_token: &CancellationToken) {
    let config = app_config.config.load();
    let host = config.api.host.to_string();
    let guard = app_config.hdhomerun.load();
    if let Some(hdhomerun) = &*guard {
        if hdhomerun.enabled {
            for device in &hdhomerun.devices {
                if device.t_enabled {
                    let app_data = Arc::clone(app_state);
                    let app_host = host.clone();
                    let port = device.port;
                    let device_clone = Arc::new(device.clone());
                    let basic_auth = hdhomerun.auth;
                    infos.push(format!("HdHomeRun Server '{}' running: http://{host}:{port}", device.name));
                    let c_token = cancel_token.clone();
                    let active_user_manager = Arc::clone(&app_data.active_users);
                    tokio::spawn(async move {
                        let router = axum::Router::<Arc<HdHomerunAppState>>::new()
                            .layer(create_cors_layer())
                            .layer(create_compression_layer())
                            // .layer(TraceLayer::new_for_http()) // `Logger::default()`
                            .merge(hdhr_api_register(basic_auth));

                        let router: axum::Router<()> = router.with_state(Arc::new(HdHomerunAppState {
                            app_state: Arc::clone(&app_data),
                            device: Arc::clone(&device_clone),
                        }));

                        match tokio::net::TcpListener::bind(format!("{}:{}", app_host.clone(), port)).await {
                            Ok(listener) => {
                                serve(listener, router, Some(c_token), active_user_manager).await;
                                // if let Err(err) = axum::serve(listener, router.into_make_service_with_connect_info::<SocketAddr>()).into_future().await {
                                //     error!("{err}");
                                // }
                            }
                            Err(err) => error!("{err}"),
                        }
                    });
                }
            }
        }
    }
}

// async fn log_routes(request: axum::extract::Request, next: axum::middleware::Next) -> axum::response::Response {
//     println!("Route : {}", request.uri().path());
//     next.run(request).await
// }

pub async fn start_server(app_config: Arc<AppConfig>, targets: Arc<ProcessTargets>) -> futures::io::Result<()> {
    let mut infos = Vec::new();
    let cfg = app_config.config.load();
    let host = cfg.api.host.to_string();
    let port = cfg.api.port;
    let web_ui_enabled = cfg.web_ui.as_ref().is_some_and(|c| c.enabled);
    let web_dir_path = match get_web_dir_path(web_ui_enabled, cfg.api.web_root.as_str()) {
        Ok(result) => result,
        Err(err) => return Err(err)
    };
    if web_ui_enabled {
        infos.push(format!("Web root: {}", web_dir_path.display()));
    }
    let app_shared_data = create_shared_data(&app_config, &targets);
    let app_state = Arc::new(app_shared_data);
    let shared_data = Arc::clone(&app_state);

    let (cancel_token_scheduler, cancel_token_hdhomerun, cancel_token_file_watch) = {
        let cancel_tokens = app_state.cancel_tokens.load();
        (cancel_tokens.scheduler.clone(), cancel_tokens.hdhomerun.clone(), cancel_tokens.file_watch.clone())
    };

    exec_scheduler(&Arc::clone(&shared_data.http_client.load()), &app_config, &targets, &cancel_token_scheduler);
    exec_update_on_boot(Arc::clone(&shared_data.http_client.load()), &app_config, &targets);
    exec_config_watch(&app_state, &cancel_token_file_watch);

    let web_auth_enabled = is_web_auth_enabled(&cfg, web_ui_enabled);

    if app_config.api_proxy.load().is_some() {
        start_hdhomerun(&app_config, &app_state, &mut infos, &cancel_token_hdhomerun);
    }

    let web_ui_path = cfg.web_ui.as_ref().and_then(|c| c.path.as_ref()).map(|p| format!("/{p}")).unwrap_or_default();
    infos.push(format!("Server running: http://{}:{}", &cfg.api.host, &cfg.api.port));
    for info in &infos {
        info!("{info}");
    }

    // Web Server
    let mut router = axum::Router::new()
        .route("/healthcheck", axum::routing::get(healthcheck));
    if web_ui_enabled {
        router = router
            .nest_service(&format!("{web_ui_path}/static"), tower_http::services::ServeDir::new(web_dir_path.join("static")))
            .nest_service(&format!("{web_ui_path}/assets"), tower_http::services::ServeDir::new(web_dir_path.join("assets")))
            .merge(v1_api_register(web_auth_enabled, Arc::clone(&shared_data), web_ui_path.as_str()));
        if !web_ui_path.is_empty() {
            router = router.merge(index_register_with_path(&web_dir_path, web_ui_path.as_str()));
        }
    }

    let mut api_router = axum::Router::new()
        .merge(xtream_api_register())
        .merge(m3u_api_register())
        .merge(xmltv_api_register())
        .merge(hls_api_register());
    // let mut rate_limiting = false;
    if let Some(rate_limiter) = cfg.reverse_proxy.as_ref().and_then(|r| r.rate_limit.clone()) {
        // rate_limiting = rate_limiter.enabled;
        api_router = add_rate_limiter(api_router, &rate_limiter);
    }

    router = router
        .merge(api_router);

    if web_ui_enabled && web_ui_path.is_empty() {
        router = router.merge(index_register_without_path(&web_dir_path));
    }

    router = router.layer(create_cors_layer())
        .layer(create_compression_layer());
    //router = router.layer(tower_http::trace::TraceLayer::new_for_http()); // `Logger::default()`
    // router = router.layer(axum::middleware::from_fn(log_routes));

    let router: axum::Router<()> = router.with_state(shared_data.clone());
    let listener = tokio::net::TcpListener::bind(format!("{host}:{port}")).await?;
    let active_user_manager = Arc::clone(&shared_data.active_users);
    serve(listener, router, None, active_user_manager).await;
    Ok(())
    //axum::serve(listener, router.into_make_service_with_connect_info::<SocketAddr>()).into_future().await
}


fn add_rate_limiter(router: Router<Arc<AppState>>, rate_limit_cfg: &RateLimitConfig) -> Router<Arc<AppState>> {
    if rate_limit_cfg.enabled {
        let governor_conf = Arc::new(tower_governor::governor::GovernorConfigBuilder::default()
            .key_extractor(SmartIpKeyExtractor)
            .per_millisecond(rate_limit_cfg.period_millis)
            .burst_size(rate_limit_cfg.burst_size)
            .finish()
            .unwrap());
        router.layer(tower_governor::GovernorLayer {
            config: governor_conf,
        })
    } else {
        router
    }
}