class Titlescreen{
	constructor(){
		loader.changePage("titlescreen", false)
		
		this.titleScreen = document.getElementById("title-screen")
		this.proceed = document.getElementById("title-proceed")
		this.langDropdown = document.getElementById("lang-dropdown")
		
		this.lang = this.getLang()
		this.setLang(allStrings[this.lang])
		this.addLangs()
		
		pageEvents.keyAdd(this, "all", "down", this.keyDown.bind(this))
		pageEvents.add(this.titleScreen, ["mousedown", "touchstart"], this.onPressed.bind(this))
		pageEvents.add(this.langDropdown, "change", this.langChange.bind(this))
		
		assets.sounds["title"].play()
		this.gamepad = new Gamepad({
			"13": ["a", "b", "x", "y", "start", "ls", "rs"]
		}, pressed => {
			if(pressed){
				this.onPressed()
			}
		})
		if(p2.session){
			pageEvents.add(p2, "message", response => {
				if(response.type === "songsel"){
					this.goNext(true)
				}
			})
		}
	}
	
	keyDown(event, code){
		if(event && event.target === this.langDropdown){
			return
		}
		if(!code){
			code = event.keyCode
		}
		if(code == 13 || code == 32 || code == 70 || code == 74){
			// Enter, Space, F, J
			this.onPressed()
		}
	}
	onPressed(event){
		if(event){
			if(event.type === "touchstart"){
				event.preventDefault()
				this.touched = true
			}else if(event.type === "mousedown" && event.which !== 1){
				return
			}
		}
		this.titleScreen.style.cursor = "auto"
		this.clean()
		assets.sounds["don"].play()
		this.goNext()
	}
	goNext(fromP2){
		if(p2.session && !fromP2){
			p2.send("songsel")
		}else if(fromP2 || this.touched || localStorage.getItem("tutorial") === "true"){
			pageEvents.remove(p2, "message")
			setTimeout(() => {
				new SongSelect(false, false, this.touched)
			}, 500)
		}else{
			setTimeout(() => {
				new Tutorial()
			}, 500)
		}
	}
	
	getLang(){
		if(localStorage.lang && localStorage.lang in allStrings){
			return localStorage.lang
		}
		if("languages" in navigator){
			var userLang = navigator.languages.slice()
			userLang.unshift(navigator.language)
			for(var i in userLang){
				for(var j in allStrings){
					if(allStrings[j].regex.test(userLang[i])){
						return j
					}
				}
			}
		}
		return "ja"
	}
	setLang(lang){
		strings = lang
		this.proceed.innerText = strings.titleProceed
		this.proceed.setAttribute("alt", strings.titleProceed)
		loader.screen.style.fontFamily = strings.font
		loader.screen.style.fontWeight = strings.font === "Microsoft YaHei, sans-serif" ? "bold" : ""
	}
	addLangs(){
		for(var i in allStrings){
			var option = document.createElement("option")
			option.value = i
			if(i === this.lang){
				option.selected = true
			}
			option.appendChild(document.createTextNode(allStrings[i].name))
			this.langDropdown.appendChild(option)
		}
	}
	langChange(){
		this.lang = this.langDropdown.value
		localStorage.lang = this.lang
		this.setLang(allStrings[this.lang])
	}
	
	clean(){
		this.gamepad.clean()
		assets.sounds["title"].stop()
		pageEvents.keyRemove(this, "all")
		pageEvents.remove(this.titleScreen, ["mousedown", "touchstart"])
		pageEvents.remove(this.langDropdown, "change")
		delete this.titleScreen
		delete this.proceed
		delete this.langDropdown
	}
}