package system

import (
	"fmt"
	"os/exec"
	"strings"

	"github.com/yaoapp/gou"
	"github.com/yaoapp/kun/exception"
)

func init() {
	gou.RegisterProcessHandler("yao.system.Exec", processExec)
}

// processExec execute the system command
func processExec(process *gou.Process) interface{} {
	process.ValidateArgNums(1)
	cmd := process.ArgsString(0)

	_, err := exec.LookPath(cmd)
	if err != nil {
		exception.New("command %s not found: %s", 400, cmd, err.Error()).Throw()
		return nil
	}

	args := []string{}
	for i, arg := range process.Args {
		if i == 0 {
			continue
		}
		args = append(args, fmt.Sprintf("%v", arg))
	}

	res, err := exec.Command(cmd, args...).Output()
	if err != nil {
		exception.New("command %s error: %s", 500, cmd, err.Error()).Throw()
		return nil
	}

	return strings.TrimRight(string(res), "\n")
}