package main

import (
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"a301_server/internal/announcement"
	"a301_server/internal/auth"
	"a301_server/internal/bossraid"
	"a301_server/internal/chain"
	"a301_server/internal/download"
	"a301_server/internal/player"
	"a301_server/internal/server"

	_ "a301_server/docs" // swagger docs

	"github.com/tolelom/tolchain/core"
	"a301_server/pkg/config"
	"a301_server/pkg/database"
	"a301_server/pkg/middleware"
	"a301_server/routes"
)

// @title           One of the Plans API
// @version         1.0
// @description     멀티플레이어 보스 레이드 게임 플랫폼 백엔드 API
// @host            a301.api.tolelom.xyz
// @BasePath        /

// @securityDefinitions.apikey BearerAuth
// @in header
// @name Authorization
// @description JWT Bearer 토큰 (예: Bearer eyJhbGci...)

// @securityDefinitions.apikey ApiKeyAuth
// @in header
// @name X-API-Key
// @description 내부 API 키 (게임 서버 ↔ API 서버 통신용)

func main() {
	config.Load()
	config.WarnInsecureDefaults()

	db, err := database.ConnectMySQL()
	if err != nil {
		log.Fatalf("MySQL 연결 실패: %v", err)
	}
	log.Println("MySQL 연결 성공")

	// AutoMigrate
	if err := db.AutoMigrate(&auth.User{}, &announcement.Announcement{}, &download.Info{}, &chain.UserWallet{}, &bossraid.BossRoom{}, &bossraid.DedicatedServer{}, &bossraid.RoomSlot{}, &bossraid.RewardFailure{}, &player.PlayerProfile{}); err != nil {
		log.Fatalf("AutoMigrate 실패: %v", err)
	}

	rdb, err := database.ConnectRedis()
	if err != nil {
		log.Fatalf("Redis 연결 실패: %v", err)
	}
	log.Println("Redis 연결 성공")

	// ── 의존성 주입 ──────────────────────────────────────────────────

	authRepo := auth.NewRepository(db)
	authSvc := auth.NewService(authRepo, rdb)
	authHandler := auth.NewHandler(authSvc)

	chainClient := chain.NewClient(config.C.ChainNodeURLs...)
	chainRepo := chain.NewRepository(db)
	chainSvc, err := chain.NewService(chainRepo, chainClient, config.C.ChainID, config.C.OperatorKeyHex, config.C.WalletEncryptionKey)
	if err != nil {
		log.Fatalf("chain service init failed: %v", err)
	}
	chainHandler := chain.NewHandler(chainSvc)

	// Migrate v1 wallets to v2 (HKDF per-wallet keys)
	if err := chainSvc.MigrateWalletKeys(); err != nil {
		log.Fatalf("wallet key migration failed: %v", err)
	}

	userResolver := func(username string) (uint, error) {
		user, err := authRepo.FindByUsername(username)
		if err != nil {
			return 0, err
		}
		return user.ID, nil
	}
	chainSvc.SetUserResolver(userResolver)

	authSvc.SetWalletCreator(func(userID uint) error {
		_, err := chainSvc.CreateWallet(userID)
		return err
	})
	chainSvc.SetPasswordVerifier(authSvc.VerifyPassword)

	playerRepo := player.NewRepository(db)
	playerSvc := player.NewService(playerRepo)
	playerSvc.SetUserResolver(userResolver)
	playerHandler := player.NewHandler(playerSvc)

	authSvc.SetProfileCreator(func(userID uint) error {
		return playerSvc.CreateProfile(userID)
	})

	if err := authSvc.EnsureAdmin(config.C.AdminUsername, config.C.AdminPassword); err != nil {
		log.Printf("admin 계정 생성 실패: %v", err)
	} else {
		log.Printf("admin 계정 확인 완료: %s", config.C.AdminUsername)
	}

	brRepo := bossraid.NewRepository(db)
	brSvc := bossraid.NewService(brRepo, rdb)
	brSvc.SetRewardGranter(func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error) {
		result, err := chainSvc.GrantRewardByUsername(username, tokenAmount, assets)
		if result != nil {
			return result.TxID, err
		}
		return "", err
	})
	brSvc.SetExpGranter(func(username string, exp int) error {
		return playerSvc.GrantExperienceByUsername(username, exp)
	})
	brHandler := bossraid.NewHandler(brSvc)

	if config.C.InternalAPIKey == "" {
		log.Println("WARN: INTERNAL_API_KEY not set — /api/internal/* endpoints are disabled")
	}

	annRepo := announcement.NewRepository(db)
	annSvc := announcement.NewService(annRepo)
	annHandler := announcement.NewHandler(annSvc)

	dlRepo := download.NewRepository(db)
	dlSvc := download.NewService(dlRepo, config.C.GameDir)
	dlHandler := download.NewHandler(dlSvc, config.C.BaseURL)

	// ── 서버 + 라우트 설정 ───────────────────────────────────────────

	app := server.New()

	authMw := middleware.Auth(rdb, config.C.JWTSecret)
	serverAuthMw := middleware.ServerAuth(config.C.InternalAPIKey)
	idempotencyReqMw := middleware.IdempotencyRequired(rdb)

	routes.Register(app, authHandler, annHandler, dlHandler, chainHandler, brHandler, playerHandler,
		server.AuthLimiter(), server.APILimiter(), server.HealthCheck(), server.ReadyCheck(db, rdb),
		server.ChainUserLimiter(), authMw, serverAuthMw, idempotencyReqMw, server.RefreshLimiter())

	// ── 백그라운드 워커 ──────────────────────────────────────────────

	go func() {
		ticker := time.NewTicker(15 * time.Second)
		defer ticker.Stop()
		for range ticker.C {
			brSvc.CheckStaleSlots()
		}
	}()

	rewardWorker := bossraid.NewRewardWorker(
		brRepo,
		func(username string, tokenAmount uint64, assets []core.MintAssetPayload) (string, error) {
			result, err := chainSvc.GrantRewardByUsername(username, tokenAmount, assets)
			if result != nil {
				return result.TxID, err
			}
			return "", err
		},
		func(username string, exp int) error {
			return playerSvc.GrantExperienceByUsername(username, exp)
		},
		func(txID string) (bool, error) {
			result, err := chainClient.GetTxStatus(txID)
			if err != nil {
				return false, err
			}
			return result != nil && result.Success, nil
		},
	)
	rewardWorker.Start()

	// ── Graceful shutdown ────────────────────────────────────────────

	go func() {
		if err := app.Listen(":" + config.C.AppPort); err != nil {
			log.Printf("서버 Listen 종료: %v", err)
		}
	}()

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
	sig := <-sigCh
	log.Printf("수신된 시그널: %v — 서버 종료 중...", sig)

	rewardWorker.Stop()

	if err := app.ShutdownWithTimeout(10 * time.Second); err != nil {
		log.Printf("서버 종료 실패: %v", err)
	}

	if rdb != nil {
		if err := rdb.Close(); err != nil {
			log.Printf("Redis 종료 실패: %v", err)
		} else {
			log.Println("Redis 연결 종료 완료")
		}
	}
	if sqlDB, err := db.DB(); err == nil {
		if err := sqlDB.Close(); err != nil {
			log.Printf("MySQL 종료 실패: %v", err)
		} else {
			log.Println("MySQL 연결 종료 완료")
		}
	}

	log.Println("서버 종료 완료")
}