// Copyright 2015-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
//	http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 config

import (
	"os"
	"path/filepath"
	"runtime"

	"github.com/aws/amazon-ecs-cli/ecs-cli/modules/utils"
	"github.com/pkg/errors"
)

// Destination stores the config destination path to write to and the permissions to create the
// ecs config directory if none exists.
type Destination struct {
	Path string
	Mode *os.FileMode
}

// getOSName returns runtime.GOOS
// In unit tests it can be mocked
var getOSName = func() string {
	return runtime.GOOS
}

// GetWindowsBaseDataPath returns the correct path to append
// to a user home directory to store application data.
func GetWindowsBaseDataPath() string {
	return filepath.Join("AppData", "local", "ecs")
}

// GetFilePermissions is a utility method that gets permissions of a file.
func GetFilePermissions(fileName string) (*os.FileMode, error) {
	fileInfo, err := os.Stat(fileName)
	if err != nil {
		return nil, errors.Wrap(err, "Error getting Home directory permissions for config file")
	}

	mode := fileInfo.Mode()
	return &mode, nil
}

// NewDefaultDestination creates a new Destination object.
func NewDefaultDestination() (*Destination, error) {
	homeDir, err := utils.GetHomeDir()
	if err != nil {
		return nil, errors.Wrap(err, "Error finding Home directory to store config file")
	}
	mode, err := GetFilePermissions(homeDir)
	if err != nil {
		return nil, err
	}
	path := filepath.Join(homeDir, ".ecs")
	if getOSName() == "windows" {
		path = filepath.Join(homeDir, GetWindowsBaseDataPath())
	}

	return &Destination{Path: path, Mode: mode}, nil
}