package main

import (
	"bytes"
	"fmt"
	"math/rand"
	"os/exec"
	"strings"
	"syscall"
	"time"
)

func AccountShuffle(list []Account) {
	rand.Seed(time.Now().UnixNano())
	rand.Shuffle(len(list), func(i, j int) {
		list[i], list[j] = list[j], list[i]
	})
}

func CheckError(err error) {
	if err != nil {
		panic(err)
	}
}

// 运行Shell命令，设定超时时间（秒）
func ShellCmdTimeout(timeout int, cmd string, args ...string) (stdout, stderr string, e error) {
	if len(cmd) == 0 {
		e = fmt.Errorf("cannot run a empty command")
		return
	}
	var out, err bytes.Buffer
	command := exec.Command(cmd, args...)
	command.Stdout = &out
	command.Stderr = &err
	command.Start()
	// 启动routine等待结束
	done := make(chan error)
	go func() { done <- command.Wait() }()
	// 启动routine持续打印输出
	// 设定超时时间，并select它
	after := time.After(time.Duration(timeout) * time.Second)
	select {
	case <-after:
		command.Process.Signal(syscall.SIGINT)
		time.Sleep(time.Second)
		command.Process.Kill()
	case <-done:
	}
	stdout = trimOutput(out)
	stderr = trimOutput(err)

	return
}

func trimOutput(buffer bytes.Buffer) string {
	return strings.TrimSpace(string(bytes.TrimRight(buffer.Bytes(), "\x00")))
}