package config

import (
	"errors"
	"io/ioutil"
	"os"
	"path"

	"git.trj.tw/golang/utils"
	"github.com/otakukaze/envconfig"
	"gopkg.in/yaml.v2"
)

// Google config
type Google struct {
	APIKey       string   `yaml:"api_key" env:"GOOGLE_API_KEY"`
	ClientID     string   `yaml:"client_id" env:"GOOGLE_CLIENT_ID"`
	AuthURL      string   `yaml:"auth_url" env:"GOOGLE_AUTH_URL"`
	TokenURL     string   `yaml:"token_url" env:"GOOGLE_TOKEN_URL"`
	ClientSecret string   `yaml:"client_secret" env:"GOOGLE_CLIENT_SECRET"`
	RedirectURL  string   `yaml:"redirect_url" env:"GOOGLE_REDIRECT_URL"`
	Scopes       []string `yaml:"scopes" env:"GOOGLE_SCOPES"`
}

// Storage struct
type Storage struct {
	Path string `yaml:"path" env:"STORAGE_FILE_PATH"`
}

// Config main struct
type Config struct {
	Port    int     `yaml:"port" env:"PORT"`
	Google  Google  `yaml:"google"`
	Storage Storage `yaml:"storage"`
}

var conf *Config

// Load config from file and env
func Load(p ...string) (err error) {
	fp := ""
	if len(p) > 0 && len(p[0]) > 0 {
		fp = p[0]
	} else {
		wd, err := os.Getwd()
		if err != nil {
			return err
		}
		fp = path.Join(wd, "config.yml")
	}

	fp = utils.ParsePath(fp)
	if !utils.CheckExists(fp, false) {
		return errors.New("config file not found")
	}

	conf = &Config{}

	b, err := ioutil.ReadFile(fp)
	if err != nil {
		return
	}

	err = yaml.Unmarshal(b, conf)
	if err != nil {
		return
	}

	envconfig.Parse(conf)
	return
}

// Get config struct
func Get() *Config { return conf }