package main

import (
	"context"
	"fmt"
	"log"
	"net/http"

	"custom-start-page/internal/auth"
	"custom-start-page/internal/handlers"
	"custom-start-page/internal/middleware"
	"custom-start-page/internal/storage"
	"custom-start-page/pkg/config"
)

func main() {
	// Load configuration
	cfg, err := config.Load()
	if err != nil {
		log.Fatalf("Failed to load configuration: %v", err)
	}

	// Initialize DynamoDB client
	ctx := context.Background()
	dbEndpoint := ""
	if cfg.Database.UseLocalDB {
		dbEndpoint = cfg.Database.Endpoint
	}
	
	dbClient, err := storage.NewDynamoDBClient(ctx, dbEndpoint)
	if err != nil {
		log.Fatalf("Failed to create DynamoDB client: %v", err)
	}

	// Create Users table if it doesn't exist
	if err := dbClient.CreateUsersTable(ctx); err != nil {
		log.Fatalf("Failed to create Users table: %v", err)
	}

	// Initialize repositories
	userRepo := storage.NewUserRepository(dbClient, "Users")

	// Initialize auth services
	stateStore := auth.NewMemoryStateStore()
	oauthService := auth.NewOAuthService(
		cfg.OAuth.Google.ClientID,
		cfg.OAuth.Google.ClientSecret,
		cfg.OAuth.Google.RedirectURL,
		stateStore,
	)
	userService := auth.NewUserService(userRepo)
	sessionStore := auth.NewCookieSessionStore(cfg.Session.SecretKey, cfg.Session.MaxAge)

	// Initialize handlers
	authHandler := handlers.NewAuthHandler(oauthService, userService, sessionStore)
	dashboardHandler := handlers.NewDashboardHandler()

	// Setup routes
	mux := http.NewServeMux()

	// Static files
	fs := http.FileServer(http.Dir("static"))
	mux.Handle("/static/", http.StripPrefix("/static/", fs))

	// Health check
	mux.HandleFunc("GET /health", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		w.Write([]byte("OK"))
	})

	// Auth routes
	mux.HandleFunc("GET /login", authHandler.HandleLogin)
	mux.HandleFunc("GET /auth/oauth/{provider}", authHandler.HandleOAuthInitiate)
	mux.HandleFunc("GET /auth/callback/{provider}", authHandler.HandleOAuthCallback)
	mux.HandleFunc("POST /logout", authHandler.HandleLogout)

	// Root redirect
	mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
		// Check if user is logged in
		if userID, err := sessionStore.GetUserID(r); err == nil && userID != "" {
			http.Redirect(w, r, "/dashboard", http.StatusSeeOther)
			return
		}
		http.Redirect(w, r, "/login", http.StatusSeeOther)
	})

	// Create auth middleware
	requireAuth := middleware.RequireAuth(sessionStore)

	// Protected dashboard route
	mux.Handle("GET /dashboard", requireAuth(http.HandlerFunc(dashboardHandler.HandleDashboard)))

	// Start server
	addr := fmt.Sprintf("%s:%s", cfg.Server.Host, cfg.Server.Port)
	log.Printf("Starting server on %s", addr)
	if err := http.ListenAndServe(addr, mux); err != nil {
		log.Fatalf("Server failed to start: %v", err)
	}
}