package app

import (
	"codeword/internal/controller/promocode"
	"codeword/internal/controller/recovery"
	"codeword/internal/controller/rpc_controllers"
	"codeword/internal/initialize"
	"codeword/internal/repository"
	"codeword/internal/server/grpc"
	httpserver "codeword/internal/server/http"
	"codeword/internal/services"
	"codeword/internal/worker/purge_worker"
	"codeword/internal/worker/recovery_worker"
	"codeword/pkg/closer"
	"codeword/utils"
	"context"
	"errors"
	"github.com/twmb/franz-go/pkg/kgo"
	"go.uber.org/zap"
	"time"
)

func Run(ctx context.Context, cfg initialize.Config, logger *zap.Logger) error {
	defer func() {
		if r := recover(); r != nil {
			logger.Error("Recovered from a panic", zap.Any("error", r))
		}
	}()

	logger.Info("Starting application", zap.String("AppName", cfg.AppName))

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	shutdownGroup := closer.NewCloserGroup()

	mdb, err := initialize.MongoDB(ctx, cfg)
	if err != nil {
		logger.Error("Failed to initialize MongoDB", zap.Error(err))
		return err
	}

	if err = initialize.InitDatabaseIndexes(ctx, mdb, logger); err != nil {
		logger.Error("Failed to initialize db indexes", zap.Error(err))
		return err
	}

	kafkaTariffClient, err := kgo.NewClient(
		kgo.SeedBrokers(cfg.KafkaBrokers),
		kgo.ConsumeResetOffset(kgo.NewOffset().AtStart()),
		kgo.DefaultProduceTopic(cfg.KafkaTopic),
	)
	if err != nil {
		return err
	}

	err = kafkaTariffClient.Ping(ctx)
	if err != nil {
		return err
	}

	discountRpcClient, err := initialize.DiscountGRPCClient(cfg.DiscountServiceAddress)
	if err != nil {
		logger.Error("failed to connect to discount service", zap.Error(err))
		return err
	}

	brokers := initialize.NewBrokers(initialize.BrokersDeps{
		Logger:       logger,
		TariffClient: kafkaTariffClient,
		Topic:        cfg.KafkaTopic,
	})

	rdb, err := initialize.Redis(ctx, cfg)
	if err != nil {
		logger.Error("failed to connect to redis db", zap.Error(err))
		return err
	}

	encrypt := initialize.Encrypt(cfg)

	promoCodeRepo := repository.NewPromoCodeRepository(mdb.Collection("promoCodes"))
	statsRepo := repository.NewStatsRepository(repository.Deps{Rdb: nil, Mdb: mdb.Collection("promoStats")})
	codewordRepo := repository.NewCodewordRepository(repository.Deps{Rdb: rdb, Mdb: mdb.Collection("codeword")})
	userRepo := repository.NewUserRepository(repository.Deps{Rdb: nil, Mdb: mdb.Collection("users")})

	recoveryEmailSender := initialize.RecoveryEmailSender(cfg, logger)
	authClient := initialize.AuthClient(cfg, logger)

	recoveryService := services.NewRecoveryService(services.Deps{
		Logger:             logger,
		CodewordRepository: codewordRepo,
		UserRepository:     userRepo,
		Encrypt:            encrypt,
		AuthClient:         authClient,
	})

	promoService := services.NewPromoCodeService(services.PromoDeps{
		Logger:         logger,
		PromoCodeRepo:  promoCodeRepo,
		StatsRepo:      statsRepo,
		Kafka:          brokers.TariffProducer,
		DiscountClient: discountRpcClient,
	})

	jwtUtil := utils.NewJWT(&cfg)
	authMiddleware := utils.NewAuthenticator(jwtUtil)

	recoveryController := recovery.NewRecoveryController(logger, recoveryService, cfg.DefaultRedirectionURL)
	promoCodeController := promocode.NewPromoCodeController(promocode.Deps{Logger: logger, PromoCodeService: promoService, AuthMiddleware: authMiddleware})
	controllerRpc := rpc_controllers.InitRpcControllers(promoService)

	grpcServer, err := grpc.NewGRPC(logger)
	if err != nil {
		logger.Error("error init rpc server", zap.Error(err))
		return err
	}
	grpcServer.Register(controllerRpc)

	recoveryWC := recovery_worker.NewRecoveryWC(recovery_worker.Deps{
		Logger:      logger,
		Redis:       rdb,
		EmailSender: recoveryEmailSender,
		Mongo:       mdb.Collection("codeword"),
	})

	purgeWC := purge_worker.NewPurgeWC(purge_worker.Deps{
		Logger: logger,
		Mongo:  mdb.Collection("codeword"),
	})

	go recoveryWC.Start(ctx)
	go purgeWC.Start(ctx)

	server := httpserver.NewServer(httpserver.ServerConfig{
		Logger:      logger,
		Controllers: []httpserver.Controller{recoveryController, promoCodeController},
	})

	go func() {
		if err := server.Start(cfg.HTTPHost + ":" + cfg.HTTPPort); err != nil {
			logger.Error("Server startup error", zap.Error(err))
			cancel()
		}
	}()

	go grpcServer.Run(grpc.DepsGrpcRun{
		Host: cfg.GrpcHost,
		Port: cfg.GrpcPort,
	})

	server.ListRoutes()

	shutdownGroup.Add(closer.CloserFunc(server.Shutdown))
	shutdownGroup.Add(closer.CloserFunc(grpcServer.Stop))
	shutdownGroup.Add(closer.CloserFunc(mdb.Client().Disconnect))
	shutdownGroup.Add(closer.CloserFunc(recoveryWC.Stop))
	shutdownGroup.Add(closer.CloserFunc(purgeWC.Stop))

	<-ctx.Done()

	timeoutCtx, timeoutCancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer timeoutCancel()
	if err := shutdownGroup.Call(timeoutCtx); err != nil {
		if errors.Is(err, context.DeadlineExceeded) {
			logger.Error("Shutdown timed out", zap.Error(err))
		} else {
			logger.Error("Failed to shutdown services gracefully", zap.Error(err))
		}
		return err
	}

	logger.Info("Application has stopped")
	return nil
}