var previousTextLength;
var config_data;
var unread_words = 0;

function loadSentences(alertIfNew = false, increaseUnread = true) {
	fetch("./data/sentences.txt", {headers: {"Cache-Control": "no-cache, no-store"}})
		.then((response) => { 
			return response.text().then((text) => {
				document.querySelector(".sentences").innerHTML = text;
				if (text.length > previousTextLength) {
					if (increaseUnread) {
						document.getElementsByTagName("title")[0].innerText = "(" + ++unread_words + ") " + (config_data.title ? config_data.title : "One Word Each") ;
					}
					if (alertIfNew) {
						var newtxt = text.substring(previousTextLength, text.length);
						//var parser = new DOMParser();
						//var xmltxt = parser.parseFromString(newtxt, "text/xml");
						//var newword = xmltxt.getElementsByTagName("span")[0].innerHTML.trim();
						var htmltxt = document.createElement("html");
						htmltxt.innerHTML = newtxt;
						var newword = htmltxt.getElementsByTagName("span")[0].innerHTML.trim();
						if (Notification.permission == 'granted') {
							displayNotification(newword);
						}
						else {
							alert("Neues Wort: " + newword);
						}
					}
				}
				previousTextLength = text.length;
				
				// color
				var spans = document.querySelector(".sentences").getElementsByTagName("span");
				// we expect this to be from the user who's turn it is now (3 users)
				var histurnspan = spans[spans.length - 3];
				//console.log(histurnspan.getAttribute("style"));
				document.getElementById("wordinput").setAttribute("style", histurnspan.getAttribute("style"));

				initializeLoginArea();
			});
		});
}

function loadConfig() {
	fetch("./data/config.json", {headers: {"Cache-Control": "no-cache, no-store"}}).then((response) => {
		return response.text().then((text) => {
			config_data = JSON.parse(text);
			setInterval(loadSentences, 5000, ((typeof config_data.notifications !== "undefined") ? config_data.notifications : true));
		});
	}).catch(() => {
		config_data = Object(); // leave empty
	});
}

function onReloadClicked() {
	loadSentences();
	document.querySelector("#but-reload").style.visibility = "hidden";
	setTimeout(function(){
		document.querySelector("#but-reload").style.visibility = "initial";
	}, 100);
}

function sendWord() {
	var data = new FormData();
	data.append('submitted', encodeURI(document.getElementById("wordinput").value));
	data.append('user', getNextPlayer());
	const Http = new XMLHttpRequest();
	Http.open('POST', '.');
	Http.onreadystatechange=(e)=>{
		document.getElementById("wordinput").value = "";
		loadSentences(false, false);
		resetUnread();
	}
	Http.send(data);
}

function displayNotification(word) {
  if (Notification.permission == 'granted') {
	navigator.serviceWorker.getRegistration().then(function(reg) {
	  reg.showNotification("Neues Wort auf " + (config_data.title ? config_data.title : "OWE"), 
		{ body: word, icon: (config_data.logo? config_data.logo.image_path : "OWE_Logo.png"), requireInteraction: true });
	});
  }
}

function toggleArchives() {
	archives = document.getElementsByClassName("archive_links")[0];
	
	if (archives.style.display == "none") {
		archives.style.display = "flex";
		if (config_data.archive) {
			document.getElementById("archive_image").src = config_data.archive.logo_path_open
		}
		return;
	}
	archives.style.display = "none";
	if (config_data.archive) {
		document.getElementById("archive_image").src = config_data.archive.logo_path_closed
	}
}

function resetUnread() {
	unread_words = 0;
	document.getElementsByTagName("title")[0].innerText = (config_data.title ? config_data.title : "One Word Each");
}

function getNextPlayer() {
	var spans = document.querySelector(".sentences").getElementsByTagName("span");
	var lastspan = spans[spans.length - 1];
	var lastplayer = lastspan.dataset.user;
	var idx_next = (config_data.users.indexOf(lastplayer) + 1) % config_data.users.length;
	return config_data.users[idx_next];
}

function getTimeSinceLast() {
	var spans = document.querySelector(".sentences").getElementsByTagName("span");
	var lastspan = spans[spans.length - 1];
	var lasttime = lastspan.dataset.time;
	return Date.now()/1e3 - lasttime; // in seconds
}

function initializeLoginArea() {
	var loginArea = document.getElementById('login_area');
	//loginArea.innerHTML = "Eingeloggt als NOCH NICHT IMPLEMENTIERT";
	loginArea.innerHTML = ""; // first clear it out
	loginArea.innerHTML += getNextPlayer() + " ist dran!<br>\n";
	var relative_time = getTimeSinceLast();
	var days = Math.floor(relative_time/(3600*24));
	var hours = Math.floor(relative_time/(3600))%24;
	var minutes = Math.floor(relative_time/(60))%60;
	loginArea.innerHTML += "Schon seit " + days + " Tagen, " + hours + " Stunden und " + minutes + " Minuten!";
}

window.onfocus = resetUnread;

//setTimeout(loadSentences, 500);
loadConfig();
loadSentences();

var input = document.getElementById("wordinput");
input.focus();
// Execute a function when the user releases a key on the keyboard
input.addEventListener("keyup", function(event) {
  // Number 13 is the "Enter" key on the keyboard
  if (event.keyCode === 13) {
    // Cancel the default action, if needed
    event.preventDefault();
    // Trigger the button element with a click
    document.getElementById("sendbut").click();
  }
});

var isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);

if (!isMobile) {
	archives = document.getElementsByClassName("archive_links")[0];
	sentences = document.getElementsByClassName("sentences")[0];
	scrollbox = document.getElementsByClassName("scrollbox")[0];
	scrollbox.style.flexDirection = "row";
	sentences.style.fontSize = "x-large";
	archives.style.order = "1";
	document.getElementById("sidebar_button").style.display = "inline";
}

if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register('./service-worker.js')
  .then(function(registration) {
	console.log('Registration successful, scope is:', registration.scope);
  })
  .catch(function(error) {
	console.log('Service worker registration failed, error:', error);
  });
}

navigator.serviceWorker.register('./service-worker.js', {
  scope: './'
});

navigator.serviceWorker.register('./service-worker.js', {
  scope: '.'
});

Notification.requestPermission(function(status) {
	console.log('Notification permission status:', status);
});