package config

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

	"git.trj.tw/golang/utils"
	"github.com/jesseduffield/yaml"
	"github.com/otakukaze/envconfig"
)

type Server struct {
	Port int `yaml:"port" env:"SERVER_PORT"`
}

type Remote struct {
	WSLoc string `yaml:"ws_loc" env:"REMOTE_WS_LOC"`
}

type LED struct {
	Count int `yaml:"count" env:"LED_COUNT"`
	Pin   int `yaml:"pin" env:"LED_PIN"`
}

type Config struct {
	Server Server `yaml:"server"`
	Remote Remote `yaml:"remote"`
	LED    LED    `yaml:"led"`
}

var c *Config

func Load(p ...string) error {
	var fp string
	if len(p) > 0 && p[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")
	}

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

	c = &Config{}

	if err := yaml.Unmarshal(b, c); err != nil {
		return err
	}

	envconfig.Parse(c)

	return nil
}

func Get() *Config {
	if c == nil {
		panic(errors.New("config not init"))
	}
	return c
}