package esutil

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/spf13/viper"
	"io/ioutil"
	"net/http"
	"os/exec"
	"strings"
	"time"
)

//初始化配置文件
func InitYml(configPath string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return false, err
	}
	if err := v.WriteConfig(); err != nil {
		return false, err
	}
	return true, nil
}

//初始化索引
func InitIndex(indexPath string) (bool) {
	resultMsg := CMDSC("sh " + indexPath + "/indexInit.sh")
	if resultMsg == "运行失败" {
		return false
	}
	return true
}

//启动服务
func StartServer(binPath string, ip string, port string) bool {
	resultMsg := CMDSC("sh " + binPath + "/es_start.sh")
	if resultMsg == "运行失败" {
		return false
	}
	return true
}

//关闭服务
func StopServer(binPath string, ip string, port string) bool {
	b := VerifyShortNodeServer(ip, port)
	if b == true {
		resultMsg := CMDSC("sh " + binPath + "/es_stop.sh")
		if resultMsg == "运行失败" {
			return true
		}
		time.Sleep(time.Second * 3)
	}
	bs := VerifyShortNodeServer(ip, port)
	return bs
}

//更换节点角色
func UpdateNodeRole(configPath string, role string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return false, err
	}
	if role == "master" {
		v.Set("node.master", true)
	} else if role == "slave" {
		v.Set("node.master", false)
	}
	if err := v.WriteConfig(); err != nil {
		return false, err
	}
	return true, nil
}

//验证该节点是否被使用过
func VerifyCreated(configPath string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return true, err
	}
	hosts := v.GetStringSlice("discovery.zen.ping.unicast.hosts")
	if len(hosts) > 1 {
		return true, errors.New("该节点已经被使用")
	}
	return false, nil
}

//验证节点服务是否正常启动
func VerifyNodeServer(ip string, port string, waitTime int) bool {
	b := false
	url := "http://" + ip + ":" + port
	for i := 1; i < 3; i++ {
		_, err := HttpRC("GET", url, nil)
		if err != nil {
			b = false
			if i < 3 {
				time.Sleep(time.Second * time.Duration(waitTime))
				continue
			}
		} else {
			b = true
			break
		}
	}
	return b
}

//验证节点服务是否正常启动(短验证)
func VerifyShortNodeServer(ip string, port string) bool {
	url := "http://" + ip + ":" + port
	_, err := HttpRC("GET", url, nil)
	if err != nil {
		return false
	}
	return true
}

//验证节点角色
func VerifyNodeRole(configPath string, ) (string, error) {
	role := "slave"
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return role, err
	}
	flag := v.GetBool("node.master")
	if flag == true {
		role = "master"
	}
	return role, nil
}

//查询组播列表
func GetDiscoveryZenPingUnicastHosts(configPath string) ([]string, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return nil, err
	}
	hosts := v.GetStringSlice("discovery.zen.ping.unicast.hosts")
	return hosts, nil
}

//设置组播列表
func SetDiscoveryZenPingUnicastHosts(configPath string, hosts []string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return false, err
	}
	v.Set("discovery.zen.ping.unicast.hosts", hosts)
	if err := v.WriteConfig(); err != nil {
		return false, err
	}
	return true, nil
}

//更新组播列表
func UpdateDiscoveryZenPingUnicastHosts(configPath string, oldIp string, newIp string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	err := v.ReadInConfig()
	if err != nil {
		return false, err
	}
	flag := false
	hosts := v.GetStringSlice("discovery.zen.ping.unicast.hosts")
	for i, pick := range hosts {
		if pick == oldIp {
			hosts[i] = newIp
			flag = true
		}
	}
	if flag == false {
		fmt.Println("要修改的ip不在列表中")
	}
	v.Set("discovery.zen.ping.unicast.hosts", hosts)
	if err := v.WriteConfig(); err != nil {
		return false, err
	}
	return true, nil
}

//添加组播成员
func AddDiscoveryZenPingUnicastHosts(configPath string, ip string) (bool, error) {
	v := viper.New()
	v.SetConfigType("yml")
	v.SetConfigName("elasticsearch")
	v.AddConfigPath(configPath)
	errR := v.ReadInConfig()
	if errR != nil {
		return false, errR
	}
	hosts := v.GetStringSlice("discovery.zen.ping.unicast.hosts")
	hosts = append(hosts, ip)
	v.Set("discovery.zen.ping.unicast.hosts", hosts)
	if errW := v.WriteConfig(); errW != nil {
		return false, errW
	}
	return true, nil
}

type NodeInfo struct {
	NodeIp     string `json:"nodeIp"`
	NodeRole   string `json:"nodeRole"`
	NodeMaster bool   `json:"nodeMaster"`
	NodeName   string `json:"nodeName"`
}

//查询集群信息
func GetClusterInfo(ip string, port string) ([]NodeInfo, error) {
	url := "http://" + ip + ":" + port + "/_cat/nodes?v"
	buf, err := HttpRC("GET", url, nil)
	if err != nil {
		return nil, err
	}
	var inf = []NodeInfo{}
	res := strings.Split(string(buf), "\n")[1:]
	for _, r := range res {
		if r != "" {
			inx := strings.Fields(r)
			ip := inx[0]
			role := "slave"
			if find := strings.Contains(inx[7], "m"); find {
				role = "master"
			}
			master := false
			if find := strings.Contains(inx[8], "*"); find {
				master = true
			}
			name := inx[9]
			inf = append(inf, NodeInfo{
				NodeName:   name,
				NodeRole:   role,
				NodeIp:     ip,
				NodeMaster: master,
			})
		}
	}
	return inf, nil
}

//排除即将退出集群的节点
func ExcludeNode(ip string, port string) (bool, error) {
	flag := false
	url := "http://" + ip + ":" + port + "/_cluster/settings"
	body := `{
    			"transient":{
        			"cluster.routing.allocation.exclude._ip":"` + ip + `"
    			}
			}`
	buf, err := HttpRC("PUT", url, []byte(body))
	if err != nil {
		return false, err
	}
	var inf map[string]interface{}
	json.Unmarshal(buf, &inf)
	if inf["acknowledged"] != nil {
		flag = inf["acknowledged"].(bool)
	}
	return flag, nil
}

func CMDSC(scriptStr string) string {
	cmd := exec.Command("sh", "-c", scriptStr)
	var out bytes.Buffer
	cmd.Stdout = &out
	err := cmd.Run()
	if err != nil {
		return "运行失败"
	}
	return out.String()
}

func HttpRC(method string, url string, parama []byte) (buf []byte, err error) {
	timeout := time.Duration(10 * time.Second)
	client := http.Client{
		Timeout: timeout,
	}
	request, err := http.NewRequest(method, url, bytes.NewBuffer(parama))
	request.Header.Set("Content-type", "application/json")
	if err != nil {
		fmt.Println("build request fail !")
		return nil, err
	}

	resp, err := client.Do(request)
	if err != nil {
		fmt.Println("request error: ", err)
		return nil, err
	}

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println(err)
		return nil, err
	}
	return body, nil
}