package qgrpc

import (
	"context"
	"fmt"
	"github.com/coreos/etcd/clientv3"
	"globalfintech/golib/qgrpc/ping"
	"globalfintech/golib/tlog"
	"google.golang.org/grpc"
	"google.golang.org/grpc/keepalive"
	"strings"
	"time"
)

type Server struct {
	userCfg *ServerConfig
	etcdCli *clientv3.Client
	etcdId  clientv3.LeaseID
}

type Client struct {
	userCfg    *ClientConfig
	etcdCli    *clientv3.Client
	etcdId     clientv3.LeaseID
	rpcServers map[string]*grpc.ClientConn
}

type RpcServer struct {
	Name  string   //服务的名字
	Addrs []string //默认的地址
}

const (
	DFT_DIAL_TIMEOUT = 3
)

func etcdDialWrapper(cfg *BasicConfig) (*clientv3.Client, error) {
	dialTimeout := DFT_DIAL_TIMEOUT
	if cfg.DialTimeout > 0 {
		dialTimeout = cfg.DialTimeout
	}
	return clientv3.New(clientv3.Config{
		Endpoints:   cfg.EndPoints,
		DialTimeout: time.Duration(dialTimeout) * time.Second,
	})
}

func ServerRegist(cfg *ServerConfig) (server *Server, err error) {
	server = &Server{userCfg: cfg}

	if server.etcdCli, err = etcdDialWrapper(&cfg.BasicConfig); err != nil {
		return nil, err
	}

	server.register()

	return server, nil
}

func NewClient(cfg *ClientConfig) (client *Client, err error) {
	client = &Client{userCfg: cfg}

	if client.etcdCli, err = etcdDialWrapper(&cfg.BasicConfig); err != nil {
		return nil, err
	}

	client.rpcServers = make(map[string]*grpc.ClientConn)

	keepAlive := 3
	if cfg.KeepAlive > 0 {
		keepAlive = cfg.KeepAlive
	}

	for _, watchServer := range cfg.WatchServers {
		rpcServer := ParseServerName(watchServer)
		resolver := newresolver(client, rpcServer.Name, rpcServer.Addrs)
		rrBalancer := grpc.RoundRobin(resolver)

		client.rpcServers[rpcServer.Name], err = grpc.Dial("", grpc.WithInsecure(),
			grpc.WithTimeout(time.Second),
			grpc.WithKeepaliveParams(keepalive.ClientParameters{Time: time.Duration(keepAlive) * time.Second}),
			grpc.WithBalancer(rrBalancer))
	}

	go client.ping()

	return
}

//user.User|127.0.0.1:9011 -> Server{Name: user.User Addrs: []string{127.0.0.1:9011}}
func ParseServerName(serverName string) *RpcServer {
	ss := strings.Split(serverName, "|")
	s := &RpcServer{Name: ss[0]}

	//没有配置默认地址
	if len(ss) < 2 {
		return s
	}

	s.Addrs = strings.Split(ss[1], ",")
	return s
}

//根据server-name 获得对应的连接池
func (self *Client) GetConn(serverName string) *grpc.ClientConn {
	return self.rpcServers[serverName]
}

//从etcd注销
func (self *Server) Revoke() error {
	_, err := self.etcdCli.Revoke(context.Background(), self.etcdId)
	return err
}

func (self *Client) Call(ctx context.Context, method string, args, reply interface{}, opts ...grpc.CallOption) (err error) {
	ss := strings.Split(method, "/")
	fmt.Println("ss:", ss, len(ss))
	if len(ss) < 3 {
		tlog.Errorf("no grpc client available:%s", method)
		return fmt.Errorf("no grpc client available:%s", method)
	}
	conn, ok := self.rpcServers[ss[1]]
	fmt.Println("conn:", conn)
	if !ok {
		tlog.Errorf("no grpc client available:%s", method)
		return fmt.Errorf("no grpc client available:%s", method)
	}
	err = grpc.Invoke(ctx, method, args, reply, conn, opts...)
	return
}

func (self *Client) ping() {
	for range time.NewTicker(time.Second).C {
		for server, conn := range self.rpcServers {
			req, resp := &ping.NoArgs{}, &ping.NoArgs{}
			if err := grpc.Invoke(context.Background(), strings.Join([]string{server, "Ping"}, "/"), req, resp, conn); err != nil {
				tlog.Errorf("qgrpc ping||server=%s||err=%s", server, err)
			}
		}
	}
}