package service

import (
	"bytes"
	"errors"
	"log"
	"os/exec"
	"strings"
	"time"
	"videoplayer/dao"
	"videoplayer/proto"
	"videoplayer/worker"
)

func CreateShell(shellName, shellContent, server string, uid int) uint {
	id := dao.CreateShell(shellName, shellContent, server, uint(uid))
	return id
}

func FindShellByAuthID(id int) []dao.Shell {
	return dao.FindShellByAuthID(id)
}

func DeleteShellByID(id, authId uint) bool {
	user := GetUserByIDFromUserCenter(int(authId))
	if user.Role == "admin" {
		return dao.DeleteShellByIDV2(id)
	}
	return dao.DeleteShellByID(id, authId)
}

func UpdateShellByID(id, authId uint, shellName, shellContent, server string, status int, shellResult string) bool {
	return dao.UpdateShellByID(id, authId, shellName, shellContent, status, shellResult, 0, 0)
}

func UpdateShellByIDV2(id, authId uint, shellName, shellContent, server string, status int, shellResult string, shellRuntime float64) bool {
	//查看shell是否存在
	pd := dao.FindShellByID(id, authId)
	if len(pd) < 1 && pd[0].ID == 0 {
		return false
	}
	shell := pd[0]
	//如果状态为2,3转为0,1是不允许的，为了防止出现1确认包阻塞问题
	if (shell.Status == 2 || shell.Status == 3) && (status == 0 || status == 1) {
		log.Println("UpdateShellByIDV2: status change from 2/3 to 0/1 is not allowed, shell id:", id)
		return false
	}
	var elapsed float64                                                           //持续时间
	if (shell.Status == 0 || shell.Status == 1) && (status == 2 || status == 3) { //如果状态为执行中，且新更新时间状态为2或3，则获取持续时间
		elapsed = time.Since(shell.CreatedAt).Seconds()
	}
	return dao.UpdateShellByID(id, authId, shellName, shellContent, status, shellResult, shellRuntime, elapsed)
}

func FindShellWillRunByServer(server string, uid int) ([]dao.Shell, error) {
	var shells []dao.Shell
	var err error
	if server == "" {
		//err设置为server为空
		err = errors.New("server is empty")
		return shells, err
	}
	shells = dao.FindShellWillRunByServer(server, uint(uid))
	//设置状态为执行中
	for _, v := range shells {
		dao.UpdateShellByID(v.ID, uint(uid), v.ShellName, v.ShellContent, v.Status+1, v.ShellResult, 0, 0) //将状态设置为执行中
	}
	return shells, err
}

// 从服务器定时获取shell、执行并返回结果
func ShellWillRunFromServer() {
	shells, err := GetShellWillRunFromMaster(proto.Config.SERVER_NAME)
	if err != nil {
		return
	}
	var resp []proto.UpdateShellReq

	for _, v := range shells {
		//执行shell脚本,go执行命令
		start := time.Now()
		res, err2 := RunShell(v.ShellContent)
		//执行时间,转成秒
		shellRuntime := time.Since(start).Seconds()
		if err2 != "" {
			resp = append(resp, proto.UpdateShellReq{ID: v.ID, Server: v.Server, Status: 3, ShellResult: "err:" + err2 + "\nresult:" + res, ShellRuntime: shellRuntime}) //执行出错
		} else {
			resp = append(resp, proto.UpdateShellReq{ID: v.ID, Server: v.Server, Status: 2, ShellResult: res, ShellRuntime: shellRuntime}) //执行成功
		}
	}
	if len(resp) == 0 {
		return
	}
	//返回执行结果
	url := "https://" + proto.Config.MASTER_SERVER_DOMAIN + "/shell/update?super_id=1"
	var req proto.SyncUserShellResp
	req.Token = worker.GetRedisSetMembers("super_permission_tokens")[0]
	req.Shells = resp
	resp_data, err := worker.SyncDataFromMasterShellReq3(url, req)
	if err != nil {
		return
	}
	//更新执行结果
	for _, v := range resp_data {
		if v.Status < 0 {
			log.Fatalln("update shell failed:", v.ID, v.Status)
		}
	}
}

// 从服务器从主服务器获取待执行的shell
func GetShellWillRunFromMaster(server string) ([]dao.Shell, error) {
	master := proto.Config.MASTER_SERVER_DOMAIN
	//发起请求获取待执行的shell
	url := "https://" + master + "/shell/server_will_run_list?super_id=1"
	var req proto.SyncUserShellReq
	req.Server = server
	superPermissions := worker.GetRedisSetMembers("super_permission_tokens")
	if len(superPermissions) == 0 {
		log.Println("get shell will run from master error: no super permission tokens found, please check the configuration or redis!")
		return nil, errors.New("no super permission tokens found")
	}
	req.Token = superPermissions[0]
	shells, err := worker.SyncDataFromMasterShellReq2(url, req)
	if err != nil {
		return nil, err
	}
	return shells, nil
}

func RunShell(script string) (res, err string) {
	cmd := exec.Command("/bin/bash", "-c", script)
	// 使用bytes.Buffer捕获输出
	var out bytes.Buffer
	cmd.Stdout = &out
	err3 := cmd.Run()
	err3_info := ""
	if err3 != nil {
		err3_info = err3.Error()
	}
	return strings.TrimSpace(out.String()), err3_info
}