package main

import (
	"encoding/json"
	"fmt"
	"os"
	"path"
)

// isFile - check if fp is a valid file
func isFile(fp string) bool {
	info, err := os.Stat(fp)
	if os.IsNotExist(err) || !info.Mode().IsRegular() {
		return false
	}
	return true
}

// getConfig - parse config json file
func getConfig(filepath string) (Config, error) {
	// if filepath is not empty
	// try to load the token from the file
	// else load it from user homedir
	var config Config
	configFilePath := filepath
	ok := isFile(filepath)
	if !ok {
		if printDebug {
			mainLog.Println("Loading config from home directory...")
		}

		dirname, err := os.UserConfigDir()
		if err != nil {
			return config, err
		}
		configFilePath := path.Join(dirname, "lyricdownloader/config.json")
		ok := isFile(configFilePath)
		if !ok {
			return config, fmt.Errorf("%s/lyricdownloader/config.json file is not found", dirname)
		}
	}

	configFile, err := os.Open(configFilePath)
	if err != nil {
		return config, err
	}
	defer configFile.Close()

	err = json.NewDecoder(configFile).Decode(&config)
	if err != nil {
		return config, err
	}
	return config, nil
}