package app

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

	"go-backend-template/config"
	"go-backend-template/internal/client"
	"go-backend-template/internal/handler"
	"go-backend-template/internal/router"
	"go-backend-template/internal/service"
)

type App struct {
	server   *http.Server
	router   *router.Router
	shutdown chan os.Signal
}

func NewApp() *App {
	return &App{
		shutdown: make(chan os.Signal, 1),
	}
}

func (a *App) Initialize(cfg *config.Config) error {
	healthHandler := handler.NewHealthHandler()

	dukcapilClient := client.NewDukcapilClient(cfg.Dukcapil)
	dukcapilService := service.NewDukcapilService(dukcapilClient)
	dukcapilHandler := handler.NewDukcapilHandler(dukcapilService, cfg)

	a.router = router.NewRouter(
		cfg,
		nil, // authHandler
		nil, // authMiddleware
		healthHandler,
		nil, // userHandler
		dukcapilHandler,
	)

	return nil
}

func (a *App) Start(port string) error {
	engine := a.router.Init()

	// Debug: log what port value we received
	log.Printf("DEBUG: Received port value: %q", port)

	// Ensure proper address format
	// Only accept port number, not full addresses
	addr := ":" + port
	if port == "" {
		addr = ":8080" // default port
	}

	log.Printf("DEBUG: Final address: %q", addr)

	a.server = &http.Server{
		Addr:         addr,
		Handler:      engine,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	signal.Notify(a.shutdown, os.Interrupt, syscall.SIGTERM)

	go func() {
		log.Printf("Server starting on port %s", port)
		if err := a.server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Failed to start server: %v", err)
		}
	}()

	<-a.shutdown
	log.Println("Shutting down server...")

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	if err := a.server.Shutdown(ctx); err != nil {
		log.Printf("Server forced to shutdown: %v", err)
		return err
	}

	log.Println("Server exited gracefully")
	return nil
}

func (a *App) Shutdown() {
	close(a.shutdown)
}