package config

import (
	"gopkg.in/ini.v1"
	"live/app/lib/asset"
	"log"
	"os"
)

var Config config

type config struct {
	*ini.File
	RUNMODE  string
	WorkPath string
}

func init() {
	var err error
	Config.WorkPath, err = os.Getwd()
	if err != nil {
		panic(err)
	}
	// 覆盖配置
	for _, s := range asset.AssetNames() {
		if err := asset.RestoreAsset(Config.WorkPath, s); err != nil {
			log.Fatal("释放资源出错", err)
			return
		}
	}
	// 配置读取
	Config.File, err = ini.Load(Config.WorkPath + "/config/app.ini")
	if err != nil {
		log.Fatal("配置文件读取失败，err:", err)
		return
	}
	Config.ValueMapper = ExpandValueEnv
	Config.RUNMODE = Config.Section("").Key("runmode").String()
	log.Println(Config.RUNMODE)
	if Config.RUNMODE != "" {
		Config.Append(Config.WorkPath + "/config/app." + Config.RUNMODE + ".ini")
	}
}

func ExpandValueEnv(value string) (realValue string) {
	realValue = value

	vLen := len(value)
	// 3 = ${}
	if vLen < 3 {
		return
	}
	// Need start with "${" and end with "}", then return.
	if value[0] != '$' || value[1] != '{' || value[vLen-1] != '}' {
		return
	}

	key := ""
	defaultV := ""
	// value start with "${"
	for i := 2; i < vLen; i++ {
		if value[i] == '|' && (i+1 < vLen && value[i+1] == '|') {
			key = value[2:i]
			defaultV = value[i+2 : vLen-1] // other string is default value.
			break
		} else if value[i] == '}' {
			key = value[2:i]
			break
		}
	}

	realValue = os.Getenv(key)
	if realValue == "" {
		realValue = defaultV
	}

	return
}