package main

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

	"datarush/internal/gw/config"
	"datarush/internal/gw/grpc_client"
	"datarush/internal/gw/handler"
	"datarush/internal/gw/middleware"
	"datarush/internal/gw/router"
	"datarush/internal/gw/storage"
)

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

	ctx := context.Background()

	clientFactory := grpc_client.NewClientFactory()
	defer clientFactory.Close()

	authClient, err := grpc_client.NewAuthClient(ctx, cfg.GRPC.AuthServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create auth client: %v", err)
	}

	userClient, err := grpc_client.NewUserClient(ctx, cfg.GRPC.UserServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create user client: %v", err)
	}

	competitionClient, err := grpc_client.NewCompetitionClient(ctx, cfg.GRPC.CompetitionServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create competition client: %v", err)
	}

	taskClient, err := grpc_client.NewTaskClient(ctx, cfg.GRPC.TaskServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create task client: %v", err)
	}

	submissionClient, err := grpc_client.NewSubmissionClient(ctx, cfg.GRPC.SubmissionServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create submission client: %v", err)
	}

	resultsClient, err := grpc_client.NewResultsClient(ctx, cfg.GRPC.ResultsServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create results client: %v", err)
	}

	reviewClient, err := grpc_client.NewReviewClient(ctx, cfg.GRPC.ReviewServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create review client: %v", err)
	}

	achievementsClient, err := grpc_client.NewAchievementsClient(ctx, cfg.GRPC.AchievementsServiceAddr, clientFactory)
	if err != nil {
		log.Fatalf("Failed to create achievements client: %v", err)
	}

	s3Storage, err := storage.NewS3Storage(storage.S3Config{
		AccessKeyID:     cfg.S3.AccessKeyID,
		SecretAccessKey: cfg.S3.SecretAccessKey,
		Region:          cfg.S3.Region,
		Bucket:          cfg.S3.Bucket,
		Endpoint:        cfg.S3.Endpoint,
	})
	if err != nil {
		log.Fatalf("Failed to create S3 storage: %v", err)
	}

	authMiddleware := middleware.NewAuthMiddleware(authClient)

	authHandler := handler.NewAuthHandler(authClient, userClient)
	competitionHandler := handler.NewCompetitionHandler(competitionClient, userClient)
	taskHandler := handler.NewTaskHandler(taskClient)
	submissionHandler := handler.NewSubmissionHandler(submissionClient, s3Storage)
	resultsHandler := handler.NewResultsHandler(resultsClient)
	reviewHandler := handler.NewReviewHandler(reviewClient)
	achievementsHandler := handler.NewAchievementsHandler(achievementsClient)
	pingHandler := handler.NewPingHandler()

	rt := router.NewRouter(
		authHandler,
		competitionHandler,
		taskHandler,
		submissionHandler,
		resultsHandler,
		reviewHandler,
		achievementsHandler,
		pingHandler,
		authMiddleware,
	)

	httpHandler := rt.Setup()

	addr := fmt.Sprintf("%s:%s", cfg.Server.Host, cfg.Server.Port)
	server := &http.Server{
		Addr:         addr,
		Handler:      httpHandler,
		ReadTimeout:  15 * time.Second,
		WriteTimeout: 15 * time.Second,
		IdleTimeout:  60 * time.Second,
	}

	go func() {
		log.Printf("Starting API Gateway on %s", addr)
		if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("Failed to start server: %v", err)
		}
	}()

	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit

	log.Println("Shutting down server...")

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

	if err := server.Shutdown(shutdownCtx); err != nil {
		log.Fatalf("Server forced to shutdown: %v", err)
	}

	log.Println("Server exited")
}