/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package wski18n

import (
	"path/filepath"
	"strings"

	goi18n "github.com/nicksnyder/go-i18n/i18n"
)

const (
	DEFAULT_LOCALE = "en_US"
)

var SUPPORTED_LOCALES = []string{
	"de_DE",
	"en_US",
	"es_ES",
	"fr_FR",
	"it_IT",
	"ja_JA",
	"ko_KR",
	"pt_BR",
	"zh_Hans",
	"zh_Hant",
}

var resourcePath = filepath.Join("wski18n", "resources")

func GetResourcePath() string {
	return resourcePath
}

func SetResourcePath(path string) {
	resourcePath = path
}

var T goi18n.TranslateFunc
var curLocale string

func init() {
	curLocale = Init(new(JibberJabberDetector))
}

func CurLocale() string {
	return curLocale
}

func Locale(detector Detector) string {

	// Use default locale until strings are translated
	/*sysLocale := normalize(detector.DetectLocale())
	  if isSupported(sysLocale) {
	      return sysLocale
	  }

	  locale := defaultLocaleForLang(detector.DetectLanguage())
	  if locale != "" {
	      return locale
	  }*/

	return DEFAULT_LOCALE
}

func Init(detector Detector) string {
	l := Locale(detector)
	InitWithLocale(l)
	return l
}

func InitWithLocale(locale string) {
	err := loadFromAsset(locale)
	if err != nil {
		panic(err)
	}
	T = goi18n.MustTfunc(locale)
}

func loadFromAsset(locale string) (err error) {
	assetName := locale + ".all.json"
	assetKey := filepath.Join(resourcePath, assetName)
	bytes, err := Asset(assetKey)
	if err != nil {
		return
	}
	err = goi18n.ParseTranslationFileBytes(assetName, bytes)
	return
}

func normalize(locale string) string {
	locale = strings.ToLower(strings.Replace(locale, "-", "_", 1))
	for _, l := range SUPPORTED_LOCALES {
		if strings.EqualFold(locale, l) {
			return l
		}
	}
	switch locale {
	case "zh_cn", "zh_sg":
		return "zh_Hans"
	case "zh_hk", "zh_tw":
		return "zh_Hant"
	}
	return locale
}

func isSupported(locale string) bool {
	for _, l := range SUPPORTED_LOCALES {
		if strings.EqualFold(locale, l) {
			return true
		}
	}
	return false
}

func defaultLocaleForLang(lang string) string {
	if lang != "" {
		lang = strings.ToLower(lang)
		for _, l := range SUPPORTED_LOCALES {
			if lang == LangOfLocale(l) {
				return l
			}
		}
	}
	return ""
}

func LangOfLocale(locale string) string {
	if len(locale) < 2 {
		return ""
	}
	return locale[0:2]
}