package app

import (
	"os"
)

type AppEnvType int
type AppEnvName string

const (
	AppEnvTypeDevelopment AppEnvType = iota
	AppEnvTypeStaging
	AppEnvTypeProduction
)

func (app AppEnvType) String() string {
	switch app {
	case AppEnvTypeDevelopment:
		return "development"
	case AppEnvTypeStaging:
		return "staging"
	case AppEnvTypeProduction:
		return "production"
	default:
		return "unknown"
	}
}

var (
	knownEnvTypeEnvs = []string{
		"UNIVERSE_ENV",
		"APP_ENV",
	}
)

func provideEnv() AppEnvType {
	for _, envType := range knownEnvTypeEnvs {
		value := os.Getenv(envType)
		if value == "" {
			continue
		}

		switch envType {
		case "development", "dev", "devel":
			return AppEnvTypeDevelopment
		case "staging", "test":
			return AppEnvTypeStaging
		case "production", "prod":
			return AppEnvTypeProduction
		default:
			return AppEnvTypeDevelopment
		}
	}

	return AppEnvTypeDevelopment
}