/*
 Copyright 2021 The KubeSphere Authors.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/

package util

import (
	"fmt"
	"os"
	"strings"
)

const DefaultErrorExitCode = 1

var ErrExit = fmt.Errorf("exit")

func fatal(msg string, code int) {
	if len(msg) > 0 {
		// add newline if needed
		if !strings.HasSuffix(msg, "\n") {
			msg += "\n"
		}
		fmt.Fprint(os.Stderr, msg)
	}
	os.Exit(code)
}

var fatalErrHandler = fatal

func CheckErr(err error) {
	checkErr(err, fatalErrHandler)
}

func checkErr(err error, handleErr func(string, int)) {
	if err == nil {
		return
	}

	switch {
	case err == ErrExit:
		handleErr("", DefaultErrorExitCode)
	default:
		msg := err.Error()
		if !strings.HasPrefix(msg, "error: ") {
			msg = fmt.Sprintf("error: %s", msg)
		}
		handleErr(msg, DefaultErrorExitCode)
	}
}
