package main

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

	"gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/config"
	giteaclient "gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/gitea"
	"gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/handlers"
	"gitea.leeworks.dev/0xwheatyz/gitea-mobile/internal/middleware"
)

func main() {
	// Set up structured logging.
	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
		Level: slog.LevelInfo,
	})))

	cfg, err := config.Load()
	if err != nil {
		log.Fatalf("configuration error: %v", err)
	}

	// Create Gitea API client.
	client := giteaclient.NewClient(cfg.GiteaURL)

	// Create handler with all routes.
	mux := http.NewServeMux()
	h := handlers.NewHandler(cfg, client)
	h.RegisterRoutes(mux)

	// Apply middleware chain: logging -> auth.
	var handler http.Handler = mux
	handler = middleware.Auth(cfg.SessionSecret, cfg.GiteaToken)(handler)
	handler = middleware.Logging()(handler)

	srv := &http.Server{
		Addr:    cfg.ListenAddr,
		Handler: handler,
	}

	// Channel to receive shutdown signals.
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGTERM, syscall.SIGINT)

	// Start server in a goroutine.
	go func() {
		slog.Info("server starting", "addr", cfg.ListenAddr, "gitea_url", cfg.GiteaURL)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("server error: %v", err)
		}
	}()

	// Block until a shutdown signal is received.
	sig := <-quit
	slog.Info("shutdown signal received, draining in-flight requests", "signal", sig.String())

	// Give in-flight requests up to 15 seconds to complete.
	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		slog.Error("server forced to shutdown", "error", err)
		os.Exit(1)
	}

	slog.Info("server stopped gracefully")
}