package cmd

import (
	"context"
	"fmt"
	"net"
	"os"

	"github.com/go-co-op/gocron/v2"
	"github.com/spf13/cobra"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/storage/pool"
	"gitlink.org.cn/cloudream/storage2/hub/internal/http"

	"gitlink.org.cn/cloudream/common/pkgs/ioswitch/exec"
	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/common/pkgs/mq"
	stgglb "gitlink.org.cn/cloudream/storage2/common/globals"
	"gitlink.org.cn/cloudream/storage2/common/models/datamap"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/distlock"
	hubrpc "gitlink.org.cn/cloudream/storage2/common/pkgs/grpc/hub"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/sysevent"
	cortypes "gitlink.org.cn/cloudream/storage2/coordinator/types"
	"gitlink.org.cn/cloudream/storage2/hub/internal/config"

	"google.golang.org/grpc"

	coormq "gitlink.org.cn/cloudream/storage2/common/pkgs/mq/coordinator"
	hubmq "gitlink.org.cn/cloudream/storage2/common/pkgs/mq/hub"

	grpcsvc "gitlink.org.cn/cloudream/storage2/hub/internal/grpc"
	cmdsvc "gitlink.org.cn/cloudream/storage2/hub/internal/mq"
)

func init() {
	var configPath string
	var httpAddr string

	cmd := &cobra.Command{
		Use:   "serve",
		Short: "start storage2 hub service",
		Run: func(cmd *cobra.Command, args []string) {
			serve(configPath, httpAddr)
		},
	}
	cmd.Flags().StringVarP(&configPath, "config", "c", "", "path to config file")
	cmd.Flags().StringVarP(&httpAddr, "http", "", "127.0.0.1:8890", "http listen address")
	RootCmd.AddCommand(cmd)
}

func serve(configPath string, httpAddr string) {
	err := config.Init(configPath)
	if err != nil {
		fmt.Printf("init config failed, err: %s", err.Error())
		os.Exit(1)
	}

	err = logger.Init(&config.Cfg().Logger)
	if err != nil {
		fmt.Printf("init logger failed, err: %s", err.Error())
		os.Exit(1)
	}

	stgglb.InitLocal(config.Cfg().Local)
	stgglb.InitMQPool(config.Cfg().RabbitMQ)
	stgglb.InitHubRPCPool(&hubrpc.PoolConfig{})
	// stgglb.Stats.SetupHubStorageTransfer(*config.Cfg().Local.HubID)
	// stgglb.Stats.SetupHubTransfer(*config.Cfg().Local.HubID)
	// 获取Hub配置
	hubCfg := downloadHubConfig()

	// 初始化存储服务管理器
	stgPool := pool.NewPool()

	// 初始化执行器
	worker := exec.NewWorker()

	// 初始化HTTP服务
	httpSvr, err := http.NewServer(httpAddr, http.NewService(&worker, stgPool))
	if err != nil {
		logger.Fatalf("new http server failed, err: %s", err.Error())
	}
	go serveHTTP(httpSvr)

	// 启动网络连通性检测，并就地检测一次
	// conCol := connectivity.NewCollector(&config.Cfg().Connectivity, func(collector *connectivity.Collector) {
	// 	log := logger.WithField("Connectivity", "")

	// 	coorCli, err := stgglb.CoordinatorMQPool.Acquire()
	// 	if err != nil {
	// 		log.Warnf("acquire coordinator mq failed, err: %s", err.Error())
	// 		return
	// 	}
	// 	defer stgglb.CoordinatorMQPool.Release(coorCli)

	// 	cons := collector.GetAll()
	// 	hubCons := make([]cortypes.HubConnectivity, 0, len(cons))
	// 	for _, con := range cons {
	// 		var delay *float32
	// 		if con.Latency != nil {
	// 			v := float32(con.Latency.Microseconds()) / 1000
	// 			delay = &v
	// 		}

	// 		hubCons = append(hubCons, cortypes.HubConnectivity{
	// 			FromHubID: *stgglb.Local.HubID,
	// 			ToHubID:   con.ToHubID,
	// 			Latency:   delay,
	// 			TestTime:  con.TestTime,
	// 		})
	// 	}

	// 	_, err = coorCli.UpdateHubConnectivities(coormq.ReqUpdateHubConnectivities(hubCons))
	// 	if err != nil {
	// 		log.Warnf("update hub connectivities: %v", err)
	// 	}
	// })
	// conCol.CollectInPlace()

	// 初始化元数据缓存服务
	// metacacheHost := metacache.NewHost()
	// go metacacheHost.Serve()
	// stgMeta := metacacheHost.AddStorageMeta()
	// hubMeta := metacacheHost.AddHubMeta()
	// conMeta := metacacheHost.AddConnectivity()

	// 启动访问统计服务
	// acStat := accessstat.NewAccessStat(accessstat.Config{
	// 	// TODO 考虑放到配置里
	// 	ReportInterval: time.Second * 10,
	// })
	// go serveAccessStat(acStat)

	// 初始化分布式锁服务
	distlock, err := distlock.NewService(&config.Cfg().DistLock)
	if err != nil {
		logger.Fatalf("new ipfs failed, err: %s", err.Error())
	}

	// 初始化系统事件发布器
	evtPub, err := sysevent.NewPublisher(sysevent.ConfigFromMQConfig(config.Cfg().RabbitMQ), &datamap.SourceHub{
		HubID:   hubCfg.Hub.HubID,
		HubName: hubCfg.Hub.Name,
	})
	if err != nil {
		logger.Errorf("new sysevent publisher: %v", err)
		os.Exit(1)
	}
	go servePublisher(evtPub)

	// 初始化定时任务执行器
	sch := setupTickTask(stgPool, evtPub)
	sch.Start()
	defer sch.Shutdown()

	// 启动命令服务器
	// TODO 需要设计HubID持久化机制
	hubSvr, err := hubmq.NewServer(cmdsvc.NewService(stgPool), config.Cfg().ID, config.Cfg().RabbitMQ)
	if err != nil {
		logger.Fatalf("new hub server failed, err: %s", err.Error())
	}
	hubSvr.OnError(func(err error) {
		logger.Warnf("hub server err: %s", err.Error())
	})
	go serveHubServer(hubSvr)

	// 启动GRPC服务
	listenAddr := config.Cfg().GRPC.MakeListenAddress()
	lis, err := net.Listen("tcp", listenAddr)
	if err != nil {
		logger.Fatalf("listen on %s failed, err: %s", listenAddr, err.Error())
	}
	s := grpc.NewServer()
	hubrpc.RegisterHubServer(s, grpcsvc.NewService(&worker, stgPool))
	go serveGRPC(s, lis)

	go serveDistLock(distlock)

	foever := make(chan struct{})
	<-foever
}

func downloadHubConfig() coormq.GetHubConfigResp {
	coorCli, err := stgglb.CoordinatorMQPool.Acquire()
	if err != nil {
		logger.Errorf("new coordinator client: %v", err)
		os.Exit(1)
	}
	defer stgglb.CoordinatorMQPool.Release(coorCli)

	cfgResp, err := coorCli.GetHubConfig(coormq.ReqGetHubConfig(cortypes.HubID(config.Cfg().ID)))
	if err != nil {
		logger.Errorf("getting hub config: %v", err)
		os.Exit(1)
	}

	return *cfgResp
}

func servePublisher(evtPub *sysevent.Publisher) {
	logger.Info("start serving sysevent publisher")

	ch := evtPub.Start()

loop:
	for {
		val, err := ch.Receive().Wait(context.Background())
		if err != nil {
			logger.Errorf("sysevent publisher stopped with error: %s", err.Error())
			break
		}

		switch val := val.(type) {
		case sysevent.PublishError:
			logger.Errorf("publishing event: %v", val)

		case sysevent.PublisherExited:
			if val.Err != nil {
				logger.Errorf("publisher exited with error: %v", val.Err)
			} else {
				logger.Info("publisher exited")
			}
			break loop

		case sysevent.OtherError:
			logger.Errorf("sysevent: %v", val)
		}
	}
	logger.Info("sysevent publisher stopped")

	// TODO 仅简单结束了程序
	os.Exit(1)
}

func setupTickTask(hubPool *pool.Pool, evtPub *sysevent.Publisher) gocron.Scheduler {
	sch, err := gocron.NewScheduler()
	if err != nil {
		logger.Errorf("new cron scheduler: %s", err.Error())
		os.Exit(1)
	}

	// sch.NewJob(gocron.DailyJob(1, gocron.NewAtTimes(
	// 	gocron.NewAtTime(0, 0, 0),
	// )), gocron.NewTask(tickevent.ReportStorageStats, hubPool, evtPub))

	// sch.NewJob(gocron.DailyJob(1, gocron.NewAtTimes(
	// 	gocron.NewAtTime(0, 0, 1),
	// )), gocron.NewTask(tickevent.ReportHubTransferStats, evtPub))

	// sch.NewJob(gocron.DailyJob(1, gocron.NewAtTimes(
	// 	gocron.NewAtTime(0, 0, 2),
	// )), gocron.NewTask(tickevent.ReportHubStorageTransferStats, evtPub))

	return sch
}

func serveHubServer(server *hubmq.Server) {
	logger.Info("start serving command server")

	ch := server.Start()
loop:
	for {
		val, err := ch.Receive()
		if err != nil {
			logger.Errorf("command server stopped with error: %s", err.Error())
			break
		}

		switch val := val.(type) {
		case error:
			logger.Errorf("rabbitmq connect with error: %v", val)
		case mq.ServerExit:
			if val.Error != nil {
				logger.Errorf("rabbitmq server exit with error: %v", val.Error)
			} else {
				logger.Info("rabbitmq server exit")
			}
			break loop
		}
	}
	logger.Info("command server stopped")

	// TODO 仅简单结束了程序
	os.Exit(1)
}

func serveGRPC(s *grpc.Server, lis net.Listener) {
	logger.Info("start serving grpc")

	err := s.Serve(lis)

	if err != nil {
		logger.Errorf("grpc stopped with error: %s", err.Error())
	}

	logger.Info("grpc stopped")

	// TODO 仅简单结束了程序
	os.Exit(1)
}

func serveHTTP(server *http.Server) {
	logger.Info("start serving http")

	err := server.Serve()

	if err != nil {
		logger.Errorf("http stopped with error: %s", err.Error())
	}

	logger.Info("http stopped")

	// TODO 仅简单结束了程序
	os.Exit(1)
}

func serveDistLock(svc *distlock.Service) {
	logger.Info("start serving distlock")

	err := svc.Serve()

	if err != nil {
		logger.Errorf("distlock stopped with error: %s", err.Error())
	}

	logger.Info("distlock stopped")

	// TODO 仅简单结束了程序
	os.Exit(1)
}

// func serveAccessStat(svc *accessstat.AccessStat) {
// 	logger.Info("start serving access stat")

// 	ch := svc.Start()
// loop:
// 	for {
// 		val, err := ch.Receive()
// 		if err != nil {
// 			logger.Errorf("access stat stopped with error: %v", err)
// 			break
// 		}

// 		switch val := val.(type) {
// 		case error:
// 			logger.Errorf("access stat stopped with error: %v", val)
// 			break loop
// 		}
// 	}
// 	logger.Info("access stat stopped")

// 	// TODO 仅简单结束了程序
// 	os.Exit(1)
// }