package config

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

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

// Listen -
type Listen struct {
	TargetHost string `yaml:"target_host"`
	TargetPort int    `yaml:"target_port"`
	ListenPort int    `yaml:"listen_port"`
}

// Config -
type Config struct {
	Verbose int      `yaml:"verbose" env:"PROXY_VERBOSE"`
	Listen  []Listen `yaml:"listen"`
}

var conf *Config

// Load config from file and env
func Load(p ...string) (err error) {
	var fp string
	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 exists := utils.CheckExists(fp, false); !exists {
		return errors.New("config file not exists")
	}

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

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

	envconfig.Parse(conf)
	return
}

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