package command

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"google.golang.org/grpc/reflection"

	"github.com/chrislusf/seaweedfs/weed/glog"
	"github.com/chrislusf/seaweedfs/weed/pb"
	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
	"github.com/chrislusf/seaweedfs/weed/security"
	"github.com/chrislusf/seaweedfs/weed/server"
	stats_collect "github.com/chrislusf/seaweedfs/weed/stats"
	"github.com/chrislusf/seaweedfs/weed/util"
)

var (
	f              FilerOptions
	filerStartS3   *bool
	filerS3Options S3Options
)

type FilerOptions struct {
	masters                 *string
	ip                      *string
	bindIp                  *string
	port                    *int
	publicPort              *int
	collection              *string
	defaultReplicaPlacement *string
	disableDirListing       *bool
	maxMB                   *int
	dirListingLimit         *int
	dataCenter              *string
	rack                    *string
	enableNotification      *bool
	disableHttp             *bool
	cipher                  *bool
	peers                   *string
	metricsHttpPort         *int
	cacheToFilerLimit       *int

	// default leveldb directory, used in "weed server" mode
	defaultLevelDbDirectory *string
}

func init() {
	cmdFiler.Run = runFiler // break init cycle
	f.masters = cmdFiler.Flag.String("master", "localhost:9333", "comma-separated master servers")
	f.collection = cmdFiler.Flag.String("collection", "", "all data will be stored in this collection")
	f.ip = cmdFiler.Flag.String("ip", util.DetectedHostAddress(), "filer server http listen ip address")
	f.bindIp = cmdFiler.Flag.String("ip.bind", "0.0.0.0", "ip address to bind to")
	f.port = cmdFiler.Flag.Int("port", 8888, "filer server http listen port")
	f.publicPort = cmdFiler.Flag.Int("port.readonly", 0, "readonly port opened to public")
	f.defaultReplicaPlacement = cmdFiler.Flag.String("defaultReplicaPlacement", "", "default replication type. If not specified, use master setting.")
	f.disableDirListing = cmdFiler.Flag.Bool("disableDirListing", false, "turn off directory listing")
	f.maxMB = cmdFiler.Flag.Int("maxMB", 32, "split files larger than the limit")
	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to read and write to volumes in this data center")
	f.rack = cmdFiler.Flag.String("rack", "", "prefer to write to volumes in this rack")
	f.disableHttp = cmdFiler.Flag.Bool("disableHttp", false, "disable http request, only gRpc operations are allowed")
	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
	f.peers = cmdFiler.Flag.String("peers", "", "all filers sharing the same filer store in comma separated ip:port list")
	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
	f.cacheToFilerLimit = cmdFiler.Flag.Int("cacheToFilerLimit", 0, "Small files smaller than this limit can be cached in filer store.")

	// start s3 on filer
	filerStartS3 = cmdFiler.Flag.Bool("s3", false, "whether to start S3 gateway")
	filerS3Options.port = cmdFiler.Flag.Int("s3.port", 8333, "s3 server http listen port")
	filerS3Options.domainName = cmdFiler.Flag.String("s3.domainName", "", "suffix of the host name in comma separated list, {bucket}.{domainName}")
	filerS3Options.tlsPrivateKey = cmdFiler.Flag.String("s3.key.file", "", "path to the TLS private key file")
	filerS3Options.tlsCertificate = cmdFiler.Flag.String("s3.cert.file", "", "path to the TLS certificate file")
	filerS3Options.config = cmdFiler.Flag.String("s3.config", "", "path to the config file")
}

var cmdFiler = &Command{
	UsageLine: "filer -port=8888 -master=<ip:port>[,<ip:port>]*",
	Short:     "start a file server that points to a master server, or a list of master servers",
	Long: `start a file server which accepts REST operation for any files.

	//create or overwrite the file, the directories /path/to will be automatically created
	POST /path/to/file
	//get the file content
	GET /path/to/file
	//create or overwrite the file, the filename in the multipart request will be used
	POST /path/to/
	//return a json format subdirectory and files listing
	GET /path/to/

	The configuration file "filer.toml" is read from ".", "$HOME/.seaweedfs/", or "/etc/seaweedfs/", in that order.

	The example filer.toml configuration file can be generated by "weed scaffold -config=filer"

`,
}

func runFiler(cmd *Command, args []string) bool {

	util.LoadConfiguration("security", false)

	go stats_collect.StartMetricsServer(*f.metricsHttpPort)

	if *filerStartS3 {
		filerAddress := fmt.Sprintf("%s:%d", *f.ip, *f.port)
		filerS3Options.filer = &filerAddress
		go func() {
			time.Sleep(2 * time.Second)
			filerS3Options.startS3Server()
		}()
	}

	f.startFiler()

	return true
}

func (fo *FilerOptions) startFiler() {

	defaultMux := http.NewServeMux()
	publicVolumeMux := defaultMux

	if *fo.publicPort != 0 {
		publicVolumeMux = http.NewServeMux()
	}

	defaultLevelDbDirectory := "./filerldb2"
	if fo.defaultLevelDbDirectory != nil {
		defaultLevelDbDirectory = util.ResolvePath(*fo.defaultLevelDbDirectory + "/filerldb2")
	}

	var peers []string
	if *fo.peers != "" {
		peers = strings.Split(*fo.peers, ",")
	}

	fs, nfs_err := weed_server.NewFilerServer(defaultMux, publicVolumeMux, &weed_server.FilerOption{
		Masters:            strings.Split(*fo.masters, ","),
		Collection:         *fo.collection,
		DefaultReplication: *fo.defaultReplicaPlacement,
		DisableDirListing:  *fo.disableDirListing,
		MaxMB:              *fo.maxMB,
		DirListingLimit:    *fo.dirListingLimit,
		DataCenter:         *fo.dataCenter,
		Rack:               *fo.rack,
		DefaultLevelDbDir:  defaultLevelDbDirectory,
		DisableHttp:        *fo.disableHttp,
		Host:               *fo.ip,
		Port:               uint32(*fo.port),
		Cipher:             *fo.cipher,
		CacheToFilerLimit:  int64(*fo.cacheToFilerLimit),
		Filers:             peers,
	})
	if nfs_err != nil {
		glog.Fatalf("Filer startup error: %v", nfs_err)
	}

	if *fo.publicPort != 0 {
		publicListeningAddress := *fo.bindIp + ":" + strconv.Itoa(*fo.publicPort)
		glog.V(0).Infoln("Start Seaweed filer server", util.Version(), "public at", publicListeningAddress)
		publicListener, e := util.NewListener(publicListeningAddress, 0)
		if e != nil {
			glog.Fatalf("Filer server public listener error on port %d:%v", *fo.publicPort, e)
		}
		go func() {
			if e := http.Serve(publicListener, publicVolumeMux); e != nil {
				glog.Fatalf("Volume server fail to serve public: %v", e)
			}
		}()
	}

	glog.V(0).Infof("Start Seaweed Filer %s at %s:%d", util.Version(), *fo.ip, *fo.port)
	filerListener, e := util.NewListener(
		*fo.bindIp+":"+strconv.Itoa(*fo.port),
		time.Duration(10)*time.Second,
	)
	if e != nil {
		glog.Fatalf("Filer listener error: %v", e)
	}

	// starting grpc server
	grpcPort := *fo.port + 10000
	grpcL, err := util.NewListener(*fo.bindIp+":"+strconv.Itoa(grpcPort), 0)
	if err != nil {
		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
	}
	grpcS := pb.NewGrpcServer(security.LoadServerTLS(util.GetViper(), "grpc.filer"))
	filer_pb.RegisterSeaweedFilerServer(grpcS, fs)
	reflection.Register(grpcS)
	go grpcS.Serve(grpcL)

	httpS := &http.Server{Handler: defaultMux}
	if err := httpS.Serve(filerListener); err != nil {
		glog.Fatalf("Filer Fail to serve: %v", e)
	}

}