package main

import (
	"context"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/haopengzhan/rsspipe/internal/api"
	"github.com/haopengzhan/rsspipe/internal/auth"
	"github.com/haopengzhan/rsspipe/internal/config"
	"github.com/haopengzhan/rsspipe/internal/crawler"
	"github.com/haopengzhan/rsspipe/internal/db"
)

func main() {
	log.Println("==================================================")
	log.Println("           Starting RSSPipe Server                ")
	log.Println("==================================================")

	cfg := config.LoadConfig()

	// 1. Initialize SQLite Database
	database, err := db.InitDB(cfg.DBPath)
	if err != nil {
		log.Fatalf("Fatal: Database initialization failed: %v", err)
	}
	defer database.Close()
	log.Printf("==> Database connected: %s (WAL mode enabled)\n", cfg.DBPath)

	// 2. Initialize Auth Service & Bootstrap Admin
	authService := auth.NewAuthService(database, cfg)
	if err := authService.BootstrapAdmin(); err != nil {
		log.Fatalf("Fatal: Admin bootstrap failed: %v", err)
	}

	// 3. Start Background Crawler Pool
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cr := crawler.NewCrawler(database, cfg.CrawlerIntervalMinutes, cfg.CrawlerWorkers)
	cr.Start(ctx)

	// 4. Mount API Routes
	handler := api.NewHandler(database, authService, cr)
	router := api.NewRouter(handler, authService, "./web/dist")

	server := &http.Server{
		Addr:         ":" + cfg.Port,
		Handler:      router,
		ReadTimeout:  30 * time.Second,
		WriteTimeout: 30 * time.Second,
		IdleTimeout:  120 * time.Second,
	}

	// 5. Graceful shutdown handler
	go func() {
		sigChan := make(chan os.Signal, 1)
		signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
		<-sigChan

		log.Println("\n==> Shutting down RSSPipe gracefully...")
		cancel()

		shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 10*time.Second)
		defer shutdownCancel()

		if err := server.Shutdown(shutdownCtx); err != nil {
			log.Printf("Error during server shutdown: %v\n", err)
		}
	}()

	log.Printf("==> RSSPipe HTTP Server listening at http://localhost:%s\n", cfg.Port)
	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		log.Fatalf("Fatal: Server error: %v", err)
	}
	log.Println("==> RSSPipe Server stopped.")
}