package env

import (
	"fmt"
	"strings"
)

var (
	active Environment
	dev    Environment = &environment{value: "dev"} //开发环境
	fat    Environment = &environment{value: "fat"} //测试环境
	uat    Environment = &environment{value: "uat"} //预上线环境
	pro    Environment = &environment{value: "pro"} //正式环境
)

var _ Environment = (*environment)(nil)

// Environment 环境配置
type Environment interface {
	Value() string
	IsDev() bool
	IsFat() bool
	IsUat() bool
	IsPro() bool
	t()
}

type environment struct {
	value string
}

func (e *environment) Value() string {
	return e.value
}

func (e *environment) IsDev() bool {
	return e.value == "dev"
}

func (e *environment) IsFat() bool {
	return e.value == "fat"
}

func (e *environment) IsUat() bool {
	return e.value == "uat"
}

func (e *environment) IsPro() bool {
	return e.value == "pro"
}

func (e *environment) t() {}

func Set(env string) error {
	var err error

	switch strings.ToLower(strings.TrimSpace(env)) {
	case "dev":
		active = dev
	case "fat":
		active = fat
	case "uat":
		active = uat
	case "pro":
		active = pro
	default:
		err = fmt.Errorf("'%s' cannot be found, or it is illegal. enum:dev(开发环境),fat(测试环境),uat(预上线环境),pro(正式环境)", env)
	}

	return err
}

// Active 当前配置的env
func Active() Environment {
	if active == nil {
		fmt.Println("Warning: environment not set. The default 'dev' will be used.")
		active = dev
	}
	return active
}