//! Application State
//!
//! Holds shared state for the application.

use axum::extract::FromRef;
use axum_extra::extract::cookie::Key;
#[cfg(feature = "auth-jwt")]
use infra::auth::jwt::{JwtConfig, JwtValidator};
#[cfg(feature = "auth-oidc")]
use infra::auth::oidc::OidcService;
use std::collections::VecDeque;
#[cfg(feature = "local-files")]
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use tokio::sync::broadcast;

use crate::config::Config;
use crate::events::EventBus;
use crate::log_layer::LogLine;
use domain::{ActivityLogRepository, ChannelService, IAppSettingsRepository, ILibraryRepository, LibrarySyncAdapter, ProviderConfigRepository, ScheduleEngineService, UserService};
#[cfg(feature = "local-files")]
use domain::TranscodeSettingsRepository;
use k_core::db::DatabasePool;

#[derive(Clone)]
pub struct AppState {
    pub user_service: Arc<UserService>,
    pub channel_service: Arc<ChannelService>,
    pub schedule_engine: Arc<ScheduleEngineService>,
    pub provider_registry: Arc<tokio::sync::RwLock<Arc<infra::ProviderRegistry>>>,
    pub provider_config_repo: Arc<dyn ProviderConfigRepository>,
    pub cookie_key: Key,
    #[cfg(feature = "auth-oidc")]
    pub oidc_service: Option<Arc<OidcService>>,
    #[cfg(feature = "auth-jwt")]
    pub jwt_validator: Option<Arc<JwtValidator>>,
    pub config: Arc<Config>,
    pub event_tx: EventBus,
    /// Broadcast channel for streaming log lines to SSE clients.
    pub log_tx: broadcast::Sender<LogLine>,
    /// Ring buffer of recent log lines sent to new SSE clients on connect.
    pub log_history: Arc<Mutex<VecDeque<LogLine>>>,
    /// Repository for persisted in-app activity events.
    pub activity_log_repo: Arc<dyn ActivityLogRepository>,
    /// Indexes for local-files provider instances, keyed by provider instance id.
    #[cfg(feature = "local-files")]
    pub local_index: Arc<tokio::sync::RwLock<HashMap<String, Arc<infra::LocalIndex>>>>,
    /// TranscodeManager for FFmpeg HLS transcoding (requires TRANSCODE_DIR).
    #[cfg(feature = "local-files")]
    pub transcode_manager: Arc<tokio::sync::RwLock<Option<Arc<infra::TranscodeManager>>>>,
    /// Repository for transcode settings persistence.
    #[cfg(feature = "local-files")]
    pub transcode_settings_repo: Option<Arc<dyn TranscodeSettingsRepository>>,
    /// Database pool — used by infra factory functions for hot-reload.
    pub db_pool: Arc<DatabasePool>,
    pub library_repo: Arc<dyn ILibraryRepository>,
    pub library_sync_adapter: Arc<dyn LibrarySyncAdapter>,
    pub app_settings_repo: Arc<dyn IAppSettingsRepository>,
}

impl AppState {
    #[allow(clippy::too_many_arguments)]
    pub async fn new(
        user_service: UserService,
        channel_service: ChannelService,
        schedule_engine: ScheduleEngineService,
        provider_registry: Arc<tokio::sync::RwLock<Arc<infra::ProviderRegistry>>>,
        provider_config_repo: Arc<dyn ProviderConfigRepository>,
        config: Config,
        event_tx: EventBus,
        log_tx: broadcast::Sender<LogLine>,
        log_history: Arc<Mutex<VecDeque<LogLine>>>,
        activity_log_repo: Arc<dyn ActivityLogRepository>,
        db_pool: Arc<DatabasePool>,
        library_repo: Arc<dyn ILibraryRepository>,
        library_sync_adapter: Arc<dyn LibrarySyncAdapter>,
        app_settings_repo: Arc<dyn IAppSettingsRepository>,
        #[cfg(feature = "local-files")]
        transcode_settings_repo: Option<Arc<dyn TranscodeSettingsRepository>>,
    ) -> anyhow::Result<Self> {
        let cookie_key = Key::derive_from(config.cookie_secret.as_bytes());

        #[cfg(feature = "auth-oidc")]
        let oidc_service = if let (Some(issuer), Some(id), secret, Some(redirect), resource_id) = (
            &config.oidc_issuer,
            &config.oidc_client_id,
            &config.oidc_client_secret,
            &config.oidc_redirect_url,
            &config.oidc_resource_id,
        ) {
            tracing::info!("Initializing OIDC service with issuer: {}", issuer);

            let issuer_url = domain::IssuerUrl::new(issuer)
                .map_err(|e| anyhow::anyhow!("Invalid OIDC issuer URL: {}", e))?;
            let client_id = domain::ClientId::new(id)
                .map_err(|e| anyhow::anyhow!("Invalid OIDC client ID: {}", e))?;
            let client_secret = secret.as_ref().map(|s| domain::ClientSecret::new(s));
            let redirect_url = domain::RedirectUrl::new(redirect)
                .map_err(|e| anyhow::anyhow!("Invalid OIDC redirect URL: {}", e))?;
            let resource = resource_id
                .as_ref()
                .map(|r| domain::ResourceId::new(r))
                .transpose()
                .map_err(|e| anyhow::anyhow!("Invalid OIDC resource ID: {}", e))?;

            Some(Arc::new(
                OidcService::new(issuer_url, client_id, client_secret, redirect_url, resource)
                    .await?,
            ))
        } else {
            None
        };

        #[cfg(feature = "auth-jwt")]
        let jwt_validator = {
            let secret = match &config.jwt_secret {
                Some(s) if !s.is_empty() => s.clone(),
                _ => {
                    if config.is_production {
                        anyhow::bail!("JWT_SECRET is required in production");
                    }
                    tracing::warn!(
                        "⚠️  JWT_SECRET not set — using insecure development secret. DO NOT USE IN PRODUCTION!"
                    );
                    "k-template-dev-secret-not-for-production-use-only".to_string()
                }
            };

            tracing::info!("Initializing JWT validator");
            let jwt_config = JwtConfig::new(
                secret,
                config.jwt_issuer.clone(),
                config.jwt_audience.clone(),
                Some(config.jwt_expiry_hours),
                Some(config.jwt_refresh_expiry_days),
                config.is_production,
            )?;
            Some(Arc::new(JwtValidator::new(jwt_config)))
        };

        Ok(Self {
            user_service: Arc::new(user_service),
            channel_service: Arc::new(channel_service),
            schedule_engine: Arc::new(schedule_engine),
            provider_registry,
            provider_config_repo,
            cookie_key,
            #[cfg(feature = "auth-oidc")]
            oidc_service,
            #[cfg(feature = "auth-jwt")]
            jwt_validator,
            config: Arc::new(config),
            event_tx,
            log_tx,
            log_history,
            activity_log_repo,
            #[cfg(feature = "local-files")]
            local_index: Arc::new(tokio::sync::RwLock::new(HashMap::new())),
            #[cfg(feature = "local-files")]
            transcode_manager: Arc::new(tokio::sync::RwLock::new(None)),
            #[cfg(feature = "local-files")]
            transcode_settings_repo,
            db_pool,
            library_repo,
            library_sync_adapter,
            app_settings_repo,
        })
    }
}

impl FromRef<AppState> for Arc<UserService> {
    fn from_ref(input: &AppState) -> Self {
        input.user_service.clone()
    }
}

impl FromRef<AppState> for Arc<Config> {
    fn from_ref(input: &AppState) -> Self {
        input.config.clone()
    }
}

impl FromRef<AppState> for Key {
    fn from_ref(input: &AppState) -> Self {
        input.cookie_key.clone()
    }
}