package main

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

const CONFIG_LOG string = "/var/lib/gocustomurls/"

type ConfigFile struct {
	Mappings []struct {
		Protocol  string `json:"protocol"`
		VanityUrl string `json:"vanity_url"`
		RealUrl   string `json:"real_url"`
	} `json:"mappings"`
}

// 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
}

// load mapping file
func LoadFile() (ConfigFile, error) {
	var mapping ConfigFile
	dirname, err := os.UserConfigDir()
	if err != nil {
		return mapping, err
	}
	configFilePath := filepath.Join(dirname, "gocustomurls/config.json")
	ok := isFile(configFilePath)
	if !ok {
		return mapping, fmt.Errorf("%s/gocustomurls/config.json file is not found", dirname)
	}
	configFile, err := os.Open(configFilePath)
	if err != nil {
		return mapping, err
	}
	defer configFile.Close()

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