package ng

import (
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"github.com/astaxie/beego"
	"github.com/beego/i18n"
	"github.com/vmware/harbor/utils/log"
)

// BaseController wraps common methods such as i18n support, forward,  which can be leveraged by other UI render controllers.
type BaseController struct {
	beego.Controller
	i18n.Locale
	SelfRegistration bool
	IsAdmin          bool
	AuthMode         string
}

type langType struct {
	Lang string
	Name string
}

const (
	viewPath    = "sections"
	prefixNg    = "ng"
	defaultLang = "en-US"
)

var supportLanguages map[string]langType

// Prepare extracts the language information from request and populate data for rendering templates.
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 = defaultLang //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
	b.Data["SupportLanguages"] = supportLanguages

	authMode := strings.ToLower(os.Getenv("AUTH_MODE"))
	if authMode == "" {
		authMode = "db_auth"
	}
	b.AuthMode = authMode
	b.Data["AuthMode"] = b.AuthMode

}

// Forward to setup layout and template for content for a page.
func (b *BaseController) Forward(title, templateName string) {
	b.Layout = filepath.Join(prefixNg, "layout.htm")
	b.TplName = filepath.Join(prefixNg, templateName)
	b.Data["Title"] = title
	b.LayoutSections = make(map[string]string)
	b.LayoutSections["HeaderInclude"] = filepath.Join(prefixNg, viewPath, "header-include.htm")
	b.LayoutSections["FooterInclude"] = filepath.Join(prefixNg, viewPath, "footer-include.htm")
	b.LayoutSections["HeaderContent"] = filepath.Join(prefixNg, viewPath, "header-content.htm")
	b.LayoutSections["FooterContent"] = filepath.Join(prefixNg, viewPath, "footer-content.htm")

}

var langTypes []*langType

// CommonController handles request from UI that doesn't expect a page, such as /SwitchLanguage /logout ...
type CommonController struct {
	BaseController
}

// Render returns nil.
func (cc *CommonController) Render() error {
	return nil
}

// LogOut Habor UI
func (cc *CommonController) LogOut() {
	cc.DestroySession()
}

// SwitchLanguage User can swith to prefered language
func (cc *CommonController) SwitchLanguage() {
	lang := cc.GetString("lang")
	if _, exist := supportLanguages[lang]; exist {
		cc.SetSession("lang", lang)
		cc.Data["Lang"] = lang
	}
	cc.Redirect(cc.Ctx.Request.Header.Get("Referer"), http.StatusFound)
}

func init() {

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