package cmd

import (
	"context"
	"fmt"
	"os"
	"time"

	"github.com/spf13/cobra"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/storage/pool"
	"gitlink.org.cn/cloudream/jcs-pub/hub/internal/accesstoken"
	"gitlink.org.cn/cloudream/jcs-pub/hub/internal/http"
	"gitlink.org.cn/cloudream/jcs-pub/hub/internal/pubshards"
	myrpc "gitlink.org.cn/cloudream/jcs-pub/hub/internal/rpc"

	"gitlink.org.cn/cloudream/common/pkgs/logger"
	stgglb "gitlink.org.cn/cloudream/jcs-pub/common/globals"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/ioswitch/exec"
	hubrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/hub"
	"gitlink.org.cn/cloudream/jcs-pub/common/pkgs/sysevent"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"
	"gitlink.org.cn/cloudream/jcs-pub/common/types/datamap"
	"gitlink.org.cn/cloudream/jcs-pub/hub/internal/config"
	"gitlink.org.cn/cloudream/jcs-pub/hub/internal/ticktock"

	corrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/coordinator"
)

func init() {
	var configPath string
	var opt serveOptions
	cmd := cobra.Command{
		Use:   "serve",
		Short: "start serving hub",
		Run: func(cmd *cobra.Command, args []string) {
			serve(configPath, opt)
		},
	}
	cmd.Flags().StringVarP(&configPath, "config", "c", "", "config file path")
	cmd.Flags().BoolVarP(&opt.DisableHTTP, "no-http", "", false, "disable http server")
	cmd.Flags().StringVarP(&opt.HTTPListenAddr, "http", "", "", "http listen address, will override config file")
	RootCmd.AddCommand(&cmd)
}

type serveOptions struct {
	DisableHTTP    bool
	HTTPListenAddr string
}

func serve(configPath string, opts serveOptions) {
	// 加载服务配置
	err := config.Init(configPath)
	if err != nil {
		fmt.Printf("init config failed, err: %s", err.Error())
		os.Exit(1)
	}

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

	// 初始化全局变量
	stgglb.InitLocal(config.Cfg().Local)

	// 初始化各服务客户端的连接池
	corRPCCfg, err := config.Cfg().CoordinatorRPC.Build(nil)
	if err != nil {
		logger.Errorf("building coordinator rpc config: %v", err)
		os.Exit(1)
	}
	hubRPCCfg, err := config.Cfg().HubRPC.Build(nil)
	if err != nil {
		logger.Errorf("building hub rpc config: %v", err)
		os.Exit(1)
	}
	stgglb.InitPools(hubRPCCfg, corRPCCfg)

	// 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()

	// HTTP接口
	httpCfg := config.Cfg().HTTP
	if !opts.DisableHTTP && httpCfg != nil && httpCfg.Enabled {
		if opts.HTTPListenAddr != "" {
			httpCfg.Listen = opts.HTTPListenAddr
		}
	} else {
		httpCfg = nil
	}
	httpSvr := http.NewServer(httpCfg, http.NewService(&worker, stgPool))
	httpChan := httpSvr.Start()
	defer httpSvr.Stop()

	// 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)

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

	// 初始化定时任务执行器
	tktk := ticktock.New(config.Cfg().TickTock, config.Cfg().ID, stgPool, evtPub)
	tktk.Start()
	defer tktk.Stop()

	// 共享分片存储
	shardsPool := pubshards.New(config.Cfg().PubShards, hubCfg.Hub.HubID)
	shardsPool.Start()
	defer shardsPool.Stop()

	// 客户端访问令牌管理器
	accToken := accesstoken.New(config.Cfg().ID)
	accTokenChan := accToken.Start()
	defer accToken.Stop()

	// RPC服务
	rpcSvr := hubrpc.NewServer(config.Cfg().RPC, myrpc.NewService(&worker, stgPool, accToken, shardsPool), accToken)
	rpcSvrChan := rpcSvr.Start()
	defer rpcSvr.Stop()

	/// 开始监听各个模块的事件
	evtPubEvt := evtPubChan.Receive()
	accTokenEvt := accTokenChan.Receive()
	rpcEvt := rpcSvrChan.Receive()
	httpEvt := httpChan.Receive()

loop:
	for {
		select {
		case e := <-evtPubEvt.Chan():
			if e.Err != nil {
				logger.Errorf("receive publisher event: %v", err)
				break loop
			}

			switch val := e.Value.(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)
			}
			evtPubEvt = evtPubChan.Receive()

		case e := <-accTokenEvt.Chan():
			if e.Err != nil {
				logger.Errorf("receive access token event: %v", err)
				break loop
			}

			switch e := e.Value.(type) {
			case accesstoken.ExitEvent:
				if e.Err != nil {
					logger.Errorf("access token manager exited with error: %v", e.Err)
				} else {
					logger.Info("access token manager exited")
				}
				break loop
			}
			accTokenEvt = accTokenChan.Receive()

		case e := <-rpcEvt.Chan():
			if e.Err != nil {
				logger.Errorf("receive rpc event: %v", e.Err)
				break loop
			}

			switch e := e.Value.(type) {
			case rpc.ExitEvent:
				if e.Err != nil {
					logger.Errorf("rpc server exited with error: %v", e.Err)
				} else {
					logger.Infof("rpc server exited")
				}
				break loop
			}
			rpcEvt = rpcSvrChan.Receive()

		case e := <-httpEvt.Chan():
			if e.Err != nil {
				logger.Errorf("receive http event: %v", err)
				break loop
			}

			switch e := e.Value.(type) {
			case http.ExitEvent:
				logger.Infof("http server exited, err: %v", e.Err)
				break loop
			}
			httpEvt = httpChan.Receive()
		}
	}

}

func downloadHubConfig() corrpc.GetHubConfigResp {
	coorCli := stgglb.CoordinatorRPCPool.Get()
	defer coorCli.Release()

	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
	defer cancel()

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

	return *cfgResp
}