package main

import (
	"context"
	"fmt"
	"log"
	"net"
	"time"
	_ "time/tzdata"

	"github.com/ory/graceful"
	"github.com/soheilhy/cmux"
	flag "github.com/spf13/pflag"
	"golang.org/x/crypto/bcrypt"

	"github.com/naiba/nezha/cmd/dashboard/controller"
	"github.com/naiba/nezha/cmd/dashboard/rpc"
	"github.com/naiba/nezha/model"
	"github.com/naiba/nezha/proto"
	"github.com/naiba/nezha/service/singleton"
)

type DashboardCliParam struct {
	Version          bool   // 当前版本号
	ConfigFile       string // 配置文件路径
	DatebaseLocation string // Sqlite3 数据库文件路径
}

var (
	dashboardCliParam DashboardCliParam
)

func init() {
	flag.CommandLine.ParseErrorsWhitelist.UnknownFlags = true
	flag.BoolVarP(&dashboardCliParam.Version, "version", "v", false, "查看当前版本号")
	flag.StringVarP(&dashboardCliParam.ConfigFile, "config", "c", "data/config.yaml", "配置文件路径")
	flag.StringVar(&dashboardCliParam.DatebaseLocation, "db", "data/sqlite.db", "Sqlite3数据库文件路径")
	flag.Parse()

	// 初始化 dao 包
	singleton.InitConfigFromPath(dashboardCliParam.ConfigFile)
	singleton.InitTimezoneAndCache()
	singleton.InitDBFromPath(dashboardCliParam.DatebaseLocation)
	initSystem()
}

func initSystem() {
	// 初始化管理员账户
	var usersCount int64
	if err := singleton.DB.Model(&model.User{}).Count(&usersCount).Error; err != nil {
		panic(err)
	}
	if usersCount == 0 {
		hash, err := bcrypt.GenerateFromPassword([]byte("admin"), bcrypt.DefaultCost)
		if err != nil {
			panic(err)
		}
		admin := model.User{
			Username: "admin",
			Password: string(hash),
		}
		if err := singleton.DB.Create(&admin).Error; err != nil {
			panic(err)
		}
	}

	// 启动 singleton 包下的所有服务
	singleton.LoadSingleton()

	// 每天的3:30 对 监控记录 和 流量记录 进行清理
	if _, err := singleton.Cron.AddFunc("0 30 3 * * *", singleton.CleanMonitorHistory); err != nil {
		panic(err)
	}

	// 每小时对流量记录进行打点
	if _, err := singleton.Cron.AddFunc("0 0 * * * *", singleton.RecordTransferHourlyUsage); err != nil {
		panic(err)
	}
}

func main() {
	if dashboardCliParam.Version {
		fmt.Println(singleton.Version)
		return
	}

	l, err := net.Listen("tcp", fmt.Sprintf(":%d", singleton.Conf.ListenPort))
	if err != nil {
		log.Fatal(err)
	}

	m := cmux.New(l)
	grpcL := m.Match(cmux.HTTP2HeaderField("content-type", "application/grpc"))
	httpL := m.Match(cmux.HTTP1Fast())

	// TODO 使用 cmux 在同一端口服务 HTTP 和 gRPC
	singleton.CleanMonitorHistory()
	go rpc.ServeRPC(grpcL)
	serviceSentinelDispatchBus := make(chan model.Monitor) // 用于传递服务监控任务信息的channel
	go rpc.DispatchTask(serviceSentinelDispatchBus)
	go rpc.DispatchKeepalive()
	go singleton.AlertSentinelStart()
	singleton.NewServiceSentinel(serviceSentinelDispatchBus)
	srv := controller.ServeWeb()

	go dispatchReportInfoTask()
	if err := graceful.Graceful(func() error {
		return srv.Serve(httpL)
	}, func(c context.Context) error {
		log.Println("NEZHA>> Graceful::START")
		singleton.RecordTransferHourlyUsage()
		log.Println("NEZHA>> Graceful::END")
		srv.Shutdown(c)
		return nil
	}); err != nil {
		log.Printf("NEZHA>> ERROR: %v", err)
	}
}

func dispatchReportInfoTask() {
	time.Sleep(time.Second * 15)
	singleton.ServerLock.RLock()
	defer singleton.ServerLock.RUnlock()
	for _, server := range singleton.ServerList {
		if server == nil || server.TaskStream == nil {
			continue
		}
		server.TaskStream.Send(&proto.Task{
			Type: model.TaskTypeReportHostInfo,
			Data: "",
		})
	}
}