package config

import (
	"fmt"
	"os"

	"github.com/mitchellh/mapstructure"
	"github.com/spf13/viper"
)

var WorkDir = os.Getenv("MQTT_WORK_DIR")

func Initialize(path string, cfgStruct interface{}) error {
	if WorkDir == "" {
		WorkDir = "."
	}
	dir := fmt.Sprintf("%s/config/%s", WorkDir, path)
	viper.SetConfigType("yaml")
	viper.SetConfigFile(dir)
	if err := viper.ReadInConfig(); err != nil {
		return err
	}
	if err := viper.Unmarshal(&cfgStruct, func(c *mapstructure.DecoderConfig) {
		c.TagName = "yaml"
	}); err != nil {
		return err
	}
	return nil
}