// src/main.rs

use std::net::SocketAddr;
use std::sync::Arc;
use axum::{
    routing::{get, post},
    Router,
};
use tower_http::cors::{Any, CorsLayer};
use tower_http::services::ServeDir;
use sqlx::sqlite::SqlitePoolOptions;
use tracing::{info, error};

use astroresearch::Config;
use astroresearch::services::translation::Dictionary;
use astroresearch::clients::qiniu::QiniuClient;
use astroresearch::clients::ads::AdsClient;
use astroresearch::clients::arxiv::ArxivClient;
use astroresearch::services::download::Downloader;
use astroresearch::api::handlers::{AppState, self};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    // 1. 初始化日志记录器并保留异步写保护 Guard
    let _logging_guards = astroresearch::services::logging::init_logging()?;

    info!("正在启动 AstroResearch 天文学文献辅助系统后端服务...");

    // 2. 加载环境变量配置
    let config = Config::from_env();
    info!("系统配置成功载入。本地 SQLite 连接串: {}", config.database_url);

    // 创建本地馆藏物理文件夹分类结构
    std::fs::create_dir_all(&config.library_dir).unwrap_or_default();
    std::fs::create_dir_all(config.library_dir.join("PDF")).unwrap_or_default();
    std::fs::create_dir_all(config.library_dir.join("HTML")).unwrap_or_default();
    std::fs::create_dir_all(config.library_dir.join("Markdown")).unwrap_or_default();
    std::fs::create_dir_all(config.library_dir.join("Translation")).unwrap_or_default();

    // 3. 初始化本地 SQLite 数据库文件连接池
    if config.database_url.starts_with("sqlite://") {
        let db_path = config.database_url.replace("sqlite://", "");
        if !db_path.contains(":memory:") {
            let path = std::path::Path::new(&db_path);
            if !path.exists() {
                if let Some(parent) = path.parent() {
                    std::fs::create_dir_all(parent).unwrap_or_default();
                }
                std::fs::File::create(path)?;
                info!("初始化创建本地 SQLite 数据库文件: {:?}", path);
            }
        }
    }

    let pool = SqlitePoolOptions::new()
        .max_connections(5)
        .connect(&config.database_url)
        .await?;

    info!("SQLite 数据库连接已建立。");

    // 4. 自动执行数据库迁移脚本
    info!("开始执行 SQL 表结构迁移...");
    sqlx::migrate!("./migrations")
        .run(&pool)
        .await?;
    info!("数据库迁移执行完成，主表准备就绪。");

    // 5. 异步加载天文学专业名词对照词表
    let mut dict = Dictionary::new();
    if let Err(e) = dict.load_from_file("dictionary.txt") {
        error!("天文学名词词表加载失败: {}", e);
    }

    // 6. 初始化并配置全部 API 与下载客户端
    let qiniu = QiniuClient::new(
        config.qiniu_ak.clone(),
        config.qiniu_sk.clone(),
        config.qiniu_bucket.clone(),
        config.qiniu_domain.clone(),
    );

    let ads = AdsClient::new(config.ads_api_key.clone());
    let arxiv = ArxivClient::new();
    let downloader = Downloader::new();

    let app_state = Arc::new(AppState {
        config: config.clone(),
        db: pool,
        dict,
        qiniu,
        ads,
        arxiv,
        downloader,
        harvest_status: Arc::new(tokio::sync::Mutex::new(astroresearch::services::batch_sync::MetaSyncStatus::new())),
        process_status: Arc::new(tokio::sync::Mutex::new(astroresearch::services::batch_sync::AssetSyncStatus::new())),
    });

    // 7. 设置 Axum 路由、CORS 头以及 React 仪表盘静态资源托管
    let cors = CorsLayer::new()
        .allow_origin(Any)
        .allow_methods(Any)
        .allow_headers(Any);

    let api_routes = Router::new()
        .route("/search", get(handlers::search_papers))
        .route("/download", post(handlers::download_paper))
        .route("/parse", post(handlers::parse_paper))
        .route("/translate", post(handlers::translate_paper))
        .route("/citations", get(handlers::get_citation_network))
        .route("/paper", get(handlers::get_paper_detail))
        .route("/library", get(handlers::get_library))
        .route("/export", post(handlers::export_citations))
        .route("/notes", post(handlers::create_note))
        .route("/notes", get(handlers::get_notes))
        .route("/notes", axum::routing::delete(handlers::delete_note))
        .route("/sync/meta/count", get(handlers::get_meta_sync_count))
        .route("/sync/meta/run", post(handlers::run_meta_sync))
        .route("/sync/meta/status", get(handlers::get_meta_sync_status))
        .route("/sync/asset/run", post(handlers::run_asset_sync))
        .route("/sync/asset/stop", post(handlers::stop_asset_sync))
        .route("/sync/asset/status", get(handlers::get_asset_sync_status))
        .route("/sync/queries", get(handlers::get_sync_queries))
        .route("/sync/queries/:id", axum::routing::delete(handlers::delete_sync_query));

    // 静态文件资源代理托管（当前端打包至 dashboard/dist 后，直接挂载到主域名根路由）
    let serve_dir = ServeDir::new("dashboard/dist")
        .fallback(tower_http::services::ServeFile::new("dashboard/dist/index.html"));

    let app = Router::new()
        .nest("/api", api_routes)
        .fallback_service(serve_dir)
        .layer(cors)
        .layer(tower_http::trace::TraceLayer::new_for_http())
        .with_state(app_state);

    let addr = SocketAddr::from(([0, 0, 0, 0], config.port));
    info!("天文学科研服务已成功监听 http://localhost:{}", config.port);
    
    let listener = tokio::net::TcpListener::bind(addr).await?;
    axum::serve(listener, app).await?;

    Ok(())
}