package command

import (
	"net/http"
	"os"
	"runtime"
	"runtime/pprof"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/chrislusf/seaweedfs/weed/glog"
	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
	"github.com/chrislusf/seaweedfs/weed/server"
	"github.com/chrislusf/seaweedfs/weed/util"
	"github.com/gorilla/mux"
	"github.com/soheilhy/cmux"
	"google.golang.org/grpc/reflection"
)

type ServerOptions struct {
	cpuprofile *string
	v          VolumeServerOptions
}

var (
	serverOptions ServerOptions
	filerOptions  FilerOptions
)

func init() {
	cmdServer.Run = runServer // break init cycle
}

var cmdServer = &Command{
	UsageLine: "server -port=8080 -dir=/tmp -volume.max=5 -ip=server_name",
	Short:     "start a server, including volume server, and automatically elect a master server",
	Long: `start both a volume server to provide storage spaces
  and a master server to provide volume=>location mapping service and sequence number of file ids

  This is provided as a convenient way to start both volume server and master server.
  The servers are exactly the same as starting them separately.

  So other volume servers can use this embedded master server also.

  Optionally, one filer server can be started. Logically, filer servers should not be in a cluster.
  They run with meta data on disk, not shared. So each filer server is different.

  `,
}

var (
	serverIp                      = cmdServer.Flag.String("ip", "localhost", "ip or server name")
	serverBindIp                  = cmdServer.Flag.String("ip.bind", "0.0.0.0", "ip address to bind to")
	serverMaxCpu                  = cmdServer.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
	serverTimeout                 = cmdServer.Flag.Int("idleTimeout", 30, "connection idle seconds")
	serverDataCenter              = cmdServer.Flag.String("dataCenter", "", "current volume server's data center name")
	serverRack                    = cmdServer.Flag.String("rack", "", "current volume server's rack name")
	serverWhiteListOption         = cmdServer.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
	serverPeers                   = cmdServer.Flag.String("master.peers", "", "all master nodes in comma separated ip:masterPort list")
	serverSecureKey               = cmdServer.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
	serverGarbageThreshold        = cmdServer.Flag.Float64("garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
	masterPort                    = cmdServer.Flag.Int("master.port", 9333, "master server http listen port")
	masterMetaFolder              = cmdServer.Flag.String("master.dir", "", "data directory to store meta data, default to same as -dir specified")
	masterVolumeSizeLimitMB       = cmdServer.Flag.Uint("master.volumeSizeLimitMB", 30*1000, "Master stops directing writes to oversized volumes.")
	masterVolumePreallocate       = cmdServer.Flag.Bool("master.volumePreallocate", false, "Preallocate disk space for volumes.")
	masterDefaultReplicaPlacement = cmdServer.Flag.String("master.defaultReplicaPlacement", "000", "Default replication type if not specified.")
	volumeDataFolders             = cmdServer.Flag.String("dir", os.TempDir(), "directories to store data files. dir[,dir]...")
	volumeMaxDataVolumeCounts     = cmdServer.Flag.String("volume.max", "7", "maximum numbers of volumes, count[,count]...")
	pulseSeconds                  = cmdServer.Flag.Int("pulseSeconds", 5, "number of seconds between heartbeats")
	isStartingFiler               = cmdServer.Flag.Bool("filer", false, "whether to start filer")

	serverWhiteList []string
)

func init() {
	serverOptions.cpuprofile = cmdServer.Flag.String("cpuprofile", "", "cpu profile output file")
	filerOptions.collection = cmdServer.Flag.String("filer.collection", "", "all data will be stored in this collection")
	filerOptions.port = cmdServer.Flag.Int("filer.port", 8888, "filer server http listen port")
	filerOptions.grpcPort = cmdServer.Flag.Int("filer.port.grpc", 0, "filer grpc server listen port, default to http port + 10000")
	filerOptions.publicPort = cmdServer.Flag.Int("filer.port.public", 0, "filer server public http listen port")
	filerOptions.defaultReplicaPlacement = cmdServer.Flag.String("filer.defaultReplicaPlacement", "", "Default replication type if not specified during runtime.")
	filerOptions.redirectOnRead = cmdServer.Flag.Bool("filer.redirectOnRead", false, "whether proxy or redirect to volume server during file GET request")
	filerOptions.disableDirListing = cmdServer.Flag.Bool("filer.disableDirListing", false, "turn off directory listing")
	filerOptions.maxMB = cmdServer.Flag.Int("filer.maxMB", 32, "split files larger than the limit")
	filerOptions.dirListingLimit = cmdServer.Flag.Int("filer.dirListLimit", 1000, "limit sub dir listing size")

	serverOptions.v.port = cmdServer.Flag.Int("volume.port", 8080, "volume server http listen port")
	serverOptions.v.publicPort = cmdServer.Flag.Int("volume.port.public", 0, "volume server public port")
	serverOptions.v.indexType = cmdServer.Flag.String("volume.index", "memory", "Choose [memory|leveldb|boltdb|btree] mode for memory~performance balance.")
	serverOptions.v.fixJpgOrientation = cmdServer.Flag.Bool("volume.images.fix.orientation", false, "Adjust jpg orientation when uploading.")
	serverOptions.v.readRedirect = cmdServer.Flag.Bool("volume.read.redirect", true, "Redirect moved or non-local volumes.")
	serverOptions.v.publicUrl = cmdServer.Flag.String("volume.publicUrl", "", "publicly accessible address")

}

func runServer(cmd *Command, args []string) bool {
	filerOptions.secretKey = serverSecureKey
	if *serverOptions.cpuprofile != "" {
		f, err := os.Create(*serverOptions.cpuprofile)
		if err != nil {
			glog.Fatal(err)
		}
		pprof.StartCPUProfile(f)
		defer pprof.StopCPUProfile()
	}

	if *filerOptions.redirectOnRead {
		*isStartingFiler = true
	}

	master := *serverIp + ":" + strconv.Itoa(*masterPort)
	filerOptions.ip = serverIp
	serverOptions.v.ip = serverIp
	serverOptions.v.bindIp = serverBindIp
	serverOptions.v.masters = &master
	serverOptions.v.idleConnectionTimeout = serverTimeout
	serverOptions.v.maxCpu = serverMaxCpu
	serverOptions.v.dataCenter = serverDataCenter
	serverOptions.v.rack = serverRack
	serverOptions.v.pulseSeconds = pulseSeconds

	filerOptions.dataCenter = serverDataCenter

	if *filerOptions.defaultReplicaPlacement == "" {
		*filerOptions.defaultReplicaPlacement = *masterDefaultReplicaPlacement
	}

	if *serverMaxCpu < 1 {
		*serverMaxCpu = runtime.NumCPU()
	}
	runtime.GOMAXPROCS(*serverMaxCpu)

	folders := strings.Split(*volumeDataFolders, ",")

	if *masterVolumeSizeLimitMB > 30*1000 {
		glog.Fatalf("masterVolumeSizeLimitMB should be less than 30000")
	}

	if *masterMetaFolder == "" {
		*masterMetaFolder = folders[0]
	}
	if err := util.TestFolderWritable(*masterMetaFolder); err != nil {
		glog.Fatalf("Check Meta Folder (-mdir=\"%s\") Writable: %s", *masterMetaFolder, err)
	}

	if *serverWhiteListOption != "" {
		serverWhiteList = strings.Split(*serverWhiteListOption, ",")
	}

	if *isStartingFiler {
		go func() {
			time.Sleep(1 * time.Second)

			filerOptions.startFiler()

		}()
	}

	var raftWaitForMaster sync.WaitGroup
	var volumeWait sync.WaitGroup

	raftWaitForMaster.Add(1)
	volumeWait.Add(1)

	go func() {
		r := mux.NewRouter()
		ms := weed_server.NewMasterServer(r, *masterPort, *masterMetaFolder,
			*masterVolumeSizeLimitMB, *masterVolumePreallocate,
			*pulseSeconds, *masterDefaultReplicaPlacement, *serverGarbageThreshold,
			serverWhiteList, *serverSecureKey,
		)

		glog.V(0).Infoln("Start Seaweed Master", util.VERSION, "at", *serverIp+":"+strconv.Itoa(*masterPort))
		masterListener, e := util.NewListener(*serverBindIp+":"+strconv.Itoa(*masterPort), 0)
		if e != nil {
			glog.Fatalf("Master startup error: %v", e)
		}

		go func() {
			raftWaitForMaster.Wait()
			time.Sleep(100 * time.Millisecond)
			myAddress, peers := checkPeers(*serverIp, *masterPort, *serverPeers)
			raftServer := weed_server.NewRaftServer(r, peers, myAddress, *masterMetaFolder, ms.Topo, *pulseSeconds)
			ms.SetRaftServer(raftServer)
			volumeWait.Done()
		}()

		raftWaitForMaster.Done()

		// start grpc and http server
		m := cmux.New(masterListener)

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

		// Create your protocol servers.
		grpcS := util.NewGrpcServer()
		master_pb.RegisterSeaweedServer(grpcS, ms)
		reflection.Register(grpcS)

		httpS := &http.Server{Handler: r}

		go grpcS.Serve(grpcL)
		go httpS.Serve(httpL)

		if err := m.Serve(); err != nil {
			glog.Fatalf("master server failed to serve: %v", err)
		}

	}()

	volumeWait.Wait()
	time.Sleep(100 * time.Millisecond)

	serverOptions.v.startVolumeServer(*volumeDataFolders, *volumeMaxDataVolumeCounts, *serverWhiteListOption)

	return true
}