package helpers

import (
	"fmt"
	"os"

	"github.com/spf13/viper"
)

var subViper *viper.Viper = nil
var currentStage = ""

const (
	ENVFILENAME = "metarare_envs"
	ENVFILEEXT  = "yaml"
)

func getStage() string {
	if currentStage != "" {
		return currentStage
	}

	if _, err := os.Stat(fmt.Sprintf("%s.%s", ENVFILENAME, ENVFILEEXT)); !os.IsNotExist(err) {
		vv := viper.New()
		vv.SetConfigName(ENVFILENAME)
		vv.SetConfigType(ENVFILEEXT)
		vv.AddConfigPath(".")
		err := vv.ReadInConfig()
		if err != nil {
			panic(fmt.Errorf("fatal error config file: %s \n", err))
		}

		currentStage = vv.GetString("stage")
	}

	return currentStage
}

func LoadEnvs() *viper.Viper {
	if subViper != nil {
		return subViper
	}

	stage := getStage()
	viper.SetConfigFile(ENVFILEEXT)
	fmt.Printf("Curretn Stage: %s\n", stage)
	if stage == "dev" {
		fmt.Println("Load env variables from local. ")
		viper.AddConfigPath(".")
		viper.SetConfigName(ENVFILENAME)
		if err := viper.ReadInConfig(); err != nil {
			panic(fmt.Errorf("Fatal error config file: %s \n", err))
		}
	} else if stage == "prod" {
		viper.AddConfigPath(".")
		viper.SetConfigName(ENVFILENAME)
		if err := viper.ReadInConfig(); err != nil {
			panic(fmt.Errorf("Fatal error config file: %s \n", err))
		}
	} else if stage == "fork" {
		fmt.Println("Load env variables from local. ")
		viper.AddConfigPath(".")
		viper.SetConfigName(ENVFILENAME)
		if err := viper.ReadInConfig(); err != nil {
			panic(fmt.Errorf("Fatal error config file: %s \n", err))
		}
	}

	subViper = viper.Sub(fmt.Sprintf("stage_%s", stage))
	return subViper
}