package cmdline

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

	"github.com/spf13/cobra"
	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/storage2/client/internal/accessstat"
	"gitlink.org.cn/cloudream/storage2/client/internal/config"
	"gitlink.org.cn/cloudream/storage2/client/internal/db"
	"gitlink.org.cn/cloudream/storage2/client/internal/downloader"
	"gitlink.org.cn/cloudream/storage2/client/internal/downloader/strategy"
	"gitlink.org.cn/cloudream/storage2/client/internal/http"
	"gitlink.org.cn/cloudream/storage2/client/internal/metacache"
	"gitlink.org.cn/cloudream/storage2/client/internal/services"
	"gitlink.org.cn/cloudream/storage2/client/internal/uploader"
	stgglb "gitlink.org.cn/cloudream/storage2/common/globals"
	"gitlink.org.cn/cloudream/storage2/common/models/datamap"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/connectivity"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/distlock"
	agtpool "gitlink.org.cn/cloudream/storage2/common/pkgs/storage/pool"
	"gitlink.org.cn/cloudream/storage2/common/pkgs/sysevent"
)

// 初始化函数，将ServeHTTP命令注册到命令列表中。
func init() {
	var configPath, listenAddr string
	cmd := cobra.Command{
		Use:   "serve",
		Short: "start serving storage service",
		Run: func(cmd *cobra.Command, args []string) {
			serveHTTP(configPath, listenAddr)
		},
	}
	cmd.Flags().StringVarP(&configPath, "config", "c", "", "config file path")
	cmd.Flags().StringVarP(&listenAddr, "listen", "l", "", "listen address")
	RootCmd.AddCommand(&cmd)
}

func serveHTTP(configPath string, listenAddr 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(&config.Cfg().HubGRPC)

	// 数据库
	db, err := db.NewDB(&config.Cfg().DB)
	if err != nil {
		logger.Fatalf("new db 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.SourceClient{
		UserID: config.Cfg().Local.UserID,
	})
	if err != nil {
		logger.Errorf("new sysevent publisher: %v", err)
		os.Exit(1)
	}
	go servePublisher(evtPub)

	// 连接性信息收集
	conCol := connectivity.NewCollector(&config.Cfg().Connectivity, nil)
	conCol.CollectInPlace()

	// 元数据缓存
	metaCacheHost := metacache.NewHost(db)
	go metaCacheHost.Serve()
	stgMeta := metaCacheHost.AddStorageMeta()
	hubMeta := metaCacheHost.AddHubMeta()
	conMeta := metaCacheHost.AddConnectivity()

	// 分布式锁
	distlockSvc, err := distlock.NewService(&config.Cfg().DistLock)
	if err != nil {
		logger.Warnf("new distlock service failed, err: %s", err.Error())
		os.Exit(1)
	}
	go serveDistLock(distlockSvc)

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

	// 存储管理器
	stgAgts := agtpool.NewPool()

	// 下载策略
	strgSel := strategy.NewSelector(config.Cfg().DownloadStrategy, stgMeta, hubMeta, conMeta)

	// 下载器
	dlder := downloader.NewDownloader(config.Cfg().Downloader, &conCol, stgAgts, strgSel, db)

	// 上传器
	uploader := uploader.NewUploader(distlockSvc, &conCol, stgAgts, stgMeta, db)

	svc, err := services.NewService(distlockSvc, &dlder, acStat, uploader, strgSel, stgMeta, db, evtPub)
	if err != nil {
		logger.Warnf("new services failed, err: %s", err.Error())
		os.Exit(1)
	}

	// 默认监听地址为":7890"，如果提供了命令行参数，则使用参数指定的地址。
	if listenAddr == "" {
		listenAddr = ":7890"
	}

	awsAuth, err := http.NewAWSAuth(config.Cfg().AuthAccessKey, config.Cfg().AuthSecretKey)
	if err != nil {
		logger.Warnf("new aws auth: %v", err)
		os.Exit(1)
	}

	// 创建一个新的HTTP服务器实例。
	httpSvr, err := http.NewServer(listenAddr, svc, awsAuth)
	if err != nil {
		logger.Warnf("new http server: %v", err)
		os.Exit(1)
	}

	// 启动HTTP服务。
	err = httpSvr.Serve()
	if err != nil {
		logger.Warnf("serving http: %v", err)
		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)
}

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)
}