package fsm

import (
	"bytes"
	"encoding/gob"
	"fmt"
	"fusenapi/initalize"
	"fusenapi/utils/autoconfig"
	"log"
	"net"
	"os"
	"time"

	"github.com/hashicorp/raft"
	"gorm.io/gorm"
)

func test1() {
	log.SetFlags(log.Llongfile)

	fsm := StartNode("fs1", "localhost:5500", nil, initalize.InitMysql("fusentest:XErSYmLELKMnf3Dh@tcp(110.41.19.98:3306)/fusentest"))

	time.Sleep(time.Second * 5)

	for i := 0; i < 30; i++ {
		go log.Println(fsm.GetUserState(39))
	}

	log.Println(fsm.GetUserState(39))

	select {}
}

// StartNode 启动节点
func StartNode(ServerID string, RaftBind string, serverconfigs []*autoconfig.ConfigServer, gdb *gorm.DB) *StateCluster {

	fsm := &StateCluster{
		store:  make(map[int64]*UserState),
		waiter: NewWaitCallback(),
		gdb:    gdb,
	}

	var retainSnapshotCount = 2
	// var ServerID string = "fs1"
	// var RaftBind string = "localhost:5500"
	var RaftDir string = fmt.Sprintf("/tmp/raftdir/%s", ServerID)

	// Setup Raft configuration.
	config := raft.DefaultConfig()
	config.LocalID = raft.ServerID(ServerID)

	// Setup Raft communication.
	addr, err := net.ResolveTCPAddr("tcp", RaftBind)
	if err != nil {
		panic(err)
	}
	transport, err := raft.NewTCPTransport(RaftBind, addr, 3, 30*time.Second, os.Stderr)
	if err != nil {
		panic(err)
	}

	// Create the snapshot store. This allows the Raft to truncate the log.
	snapshots, err := raft.NewFileSnapshotStore(RaftDir, retainSnapshotCount, os.Stderr)
	if err != nil {
		panic(fmt.Errorf("file snapshot store: %s", err))
	}

	// Create the log store and stable store.
	logStore := raft.NewInmemStore()
	stableStore := raft.NewInmemStore()

	// Create the Raft system.
	fsm.ra, err = raft.NewRaft(config, fsm, logStore, stableStore, snapshots, transport)
	if err != nil {
		panic(err)
	}

	var dup map[string]bool = make(map[string]bool)
	var rserver []raft.Server = []raft.Server{
		{
			Suffrage: raft.Voter,
			ID:       config.LocalID,
			Address:  transport.LocalAddr(),
		},
	}
	dup[string(config.LocalID)] = true
	dup[string("backend")] = true
	dup[string("product-model")] = true
	dup[string("product-template")] = true

	for _, cfg := range serverconfigs {
		if _, ok := dup[cfg.Name]; !ok {
			dup[cfg.Name] = true
			rserver = append(rserver, raft.Server{
				Suffrage: raft.Voter,
				ID:       raft.ServerID(cfg.Name),
				Address:  raft.ServerAddress(fmt.Sprintf("%s:%d", cfg.Host, cfg.Port-2000)),
			})
		}
	}

	configuration := raft.Configuration{
		Servers: rserver,
	}

	fu := fsm.ra.BootstrapCluster(configuration)
	if err := fu.Error(); err != nil {
		log.Println(err)
	}

	waitForCluster(fsm.ra)

	return fsm
}

// func JoinCluster(ServerID string, LeaderAddress string, RaftBind string, gdb *gorm.DB) *StateCluster {

// 	fsm := StartNode(ServerID, RaftBind, gdb)

// 	configFuture := fsm.ra.GetConfiguration()
// 	if err := configFuture.Error(); err != nil {
// 		log.Fatalf("failed to get raft configuration: %v", err)
// 	}

// 	for _, srv := range configFuture.Configuration().Servers {
// 		if srv.ID == raft.ServerID(ServerID) && srv.Address == raft.ServerAddress(LeaderAddress) {
// 			if future := fsm.ra.RemoveServer(srv.ID, 0, 0); future.Error() != nil {
// 				log.Fatalf("Error removing existing server [%s]: %v", ServerID, future.Error())
// 			}
// 		}
// 	}

// 	f := fsm.ra.AddVoter(raft.ServerID(ServerID), raft.ServerAddress(RaftBind), 0, 0)
// 	if f.Error() != nil {
// 		log.Fatalf("Error adding voter: %v", f.Error())
// 	}

// 	return fsm
// }

func waitForCluster(ra *raft.Raft) {
	ticker := time.NewTicker(500 * time.Millisecond)
	defer ticker.Stop()

	for range ticker.C {
		state := ra.State()
		if state == raft.Leader || state == raft.Follower {
			log.Println("Raft cluster is running")
			return
		} else {
			log.Println("Still waiting for the cluster to start...")
		}
	}
}

// var gdb *gorm.DB = initalize.InitMysql("fusentest:XErSYmLELKMnf3Dh@tcp(110.41.19.98:3306)/fusentest")

type UserState struct {
	Expired time.Time
	UserId  int64
	PwdHash uint64
}

func (us *UserState) Encode() []byte {
	var buf = bytes.NewBuffer(nil)
	err := gob.NewEncoder(buf).Encode(us)
	if err != nil {
		log.Panic(err)
		return nil
	}

	return buf.Bytes()
}

// command is used for internal command representation.
type command struct {
	Op    string
	Key   int64
	Value *UserState
}

func (cmd *command) Encode() []byte {
	var buf = bytes.NewBuffer(nil)
	err := gob.NewEncoder(buf).Encode(cmd)
	if err != nil {
		log.Panic(err)
		return nil
	}

	return buf.Bytes()
}

func (cmd *command) Decode(sbuf []byte) error {
	var buf = bytes.NewBuffer(sbuf)
	err := gob.NewDecoder(buf).Decode(cmd)
	if err != nil {
		// log.Panic(err)
		return err
	}
	return nil
}