/*
   Copyright (c) 2016 VMware, Inc. All Rights Reserved.
   Licensed 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 controllers

import (
	"log"
	"os"
	"strings"

	"github.com/astaxie/beego"
	"github.com/beego/i18n"
)

type CommonController struct {
	BaseController
}

func (c *CommonController) Render() error {
	return nil
}

type BaseController struct {
	beego.Controller
	i18n.Locale
}

type langType struct {
	Lang string
	Name string
}

const (
	DEFAULT_LANG = "en-US"
)

var supportLanguages map[string]langType

func (b *BaseController) Prepare() {

	var lang string = ""
	al := b.Ctx.Request.Header.Get("Accept-Language")

	if len(al) > 4 {
		al = al[:5] // Only compare first 5 letters.
		if i18n.IsExist(al) {
			lang = al
		}
	}

	if _, exist := supportLanguages[lang]; exist == false { //Check if support the request language.
		lang = DEFAULT_LANG //Set default language if not supported.
	}

	sessionLang := b.GetSession("lang")
	if sessionLang != nil {
		b.SetSession("Lang", lang)
		lang = sessionLang.(string)
	}

	curLang := langType{
		Lang: lang,
	}

	restLangs := make([]*langType, 0, len(langTypes)-1)
	for _, v := range langTypes {
		if lang != v.Lang {
			restLangs = append(restLangs, v)
		} else {
			curLang.Name = v.Name
		}
	}

	// Set language properties.
	b.Lang = lang
	b.Data["Lang"] = curLang.Lang
	b.Data["CurLang"] = curLang.Name
	b.Data["RestLangs"] = restLangs

	sessionUserId := b.GetSession("userId")
	if sessionUserId != nil {
		b.Data["Username"] = b.GetSession("username")
	}
	authMode := os.Getenv("AUTH_MODE")
	if authMode == "" {
		authMode = "db_auth"
	}
	b.Data["AuthMode"] = authMode
}

func (b *BaseController) ForwardTo(pageTitle string, pageName string) {
	b.Layout = "segment/base-layout.tpl"
	b.TplName = "segment/base-layout.tpl"
	b.Data["PageTitle"] = b.Tr(pageTitle)
	b.LayoutSections = make(map[string]string)
	b.LayoutSections["HeaderInc"] = "segment/header-include.tpl"
	b.LayoutSections["HeaderContent"] = "segment/header-content.tpl"
	b.LayoutSections["BodyContent"] = pageName + ".tpl"
	b.LayoutSections["ModalDialog"] = "segment/modal-dialog.tpl"
	b.LayoutSections["FootContent"] = "segment/foot-content.tpl"
}

var langTypes []*langType

func init() {

	//conf/app.conf -> os.Getenv("config_path")
	configPath := os.Getenv("CONFIG_PATH")
	if len(configPath) != 0 {
		log.Printf("Config path: %s", configPath)
		beego.AppConfigPath = configPath
		if err := beego.ParseConfig(); err != nil {
			beego.Warning("Failed to parse config file: ", configPath, "error: ", err)
		}
	}

	beego.AddFuncMap("i18n", i18n.Tr)

	langs := strings.Split(beego.AppConfig.String("lang::types"), "|")
	names := strings.Split(beego.AppConfig.String("lang::names"), "|")

	supportLanguages = make(map[string]langType)

	langTypes = make([]*langType, 0, len(langs))
	for i, v := range langs {
		t := langType{
			Lang: v,
			Name: names[i],
		}
		langTypes = append(langTypes, &t)
		supportLanguages[v] = t
	}

	for _, lang := range langs {
		if err := i18n.SetMessage(lang, "static/i18n/"+"locale_"+lang+".ini"); err != nil {
			beego.Error("Fail to set message file:" + err.Error())
		}
	}
}