// Copyright 2021 storyicon@foxmail.com
//
// 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 consts

import (
	"os"
	"path/filepath"

	"github.com/storyicon/powerproto/pkg/util/logger"
)


// defines a set of const value
const (
	// ConfigFileName defines the config file name
	ConfigFileName = "powerproto.yaml"
	// The default include can be referenced by this key in import paths
	KeyPowerProtoInclude = "$POWERPROTO_INCLUDE"
	// Defines the program directory of PowerProto, including various binary and include files
	EnvHomeDir = "POWERPROTO_HOME"
	// ProtobufRepository defines the protobuf repository
	ProtobufRepository = "https://github.com/protocolbuffers/protobuf"
)

var homeDir string
var log = logger.NewDefault("consts")

// GetHomeDir is used to get cached homeDir
func GetHomeDir() string {
	return homeDir
}

// PathForGlobalConfig is used to get path of global config
func PathForGlobalConfig() string {
	return filepath.Join(GetHomeDir(), ConfigFileName)
}

func getHomeDir() (string, error) {
	val := os.Getenv(EnvHomeDir)
	if val != "" {
		return filepath.Abs(val)
	}
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return "", err
	}
	return filepath.Join(homeDir, ".powerproto"), nil
}

func init() {
	var err error
	homeDir, err = getHomeDir()
	if err != nil {
		log.LogFatal(nil, "Please set the working directory of PowerProto by "+
			"configuring the environment variable %s", EnvHomeDir)
	}
}