makeBold = function (form) {
	var text = document.getElementById(form);
	var startIndex = text.selectionStart,
	endIndex = text.selectionEnd;
	var selectedText = text.value.substring(startIndex, endIndex);

	var format = '**'

	if (selectedText.includes('**')) {
		text.value = selectedText.replace(/\*/g, '');
	}
	else if (selectedText.length == 0) {
		text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
	}
	else {
		text.value = text.value.substring(0, startIndex) + format + selectedText + format + text.value.substring(endIndex);
	}
}

makeItalics = function (form) {
	var text = document.getElementById(form);
	var startIndex = text.selectionStart,
	endIndex = text.selectionEnd;
	var selectedText = text.value.substring(startIndex, endIndex);

	var format = '*'

	if (selectedText.includes('*')) {
		text.value = selectedText.replace(/\*/g, '');
	}
	else if (selectedText.length == 0) {
		text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
	}
	else {
		text.value = text.value.substring(0, startIndex) + format + selectedText + format + text.value.substring(endIndex);
	}
}

makeQuote = function (form) {
	var text = document.getElementById(form);
	var startIndex = text.selectionStart,
	endIndex = text.selectionEnd;
	var selectedText = text.value.substring(startIndex, endIndex);

	var format = '>'

	if (selectedText.includes('>')) {
		text.value = text.value.substring(0, startIndex) + selectedText.replace(/\>/g, '') + text.value.substring(endIndex);
	}
	else if (selectedText.length == 0) {
		text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
	}
	else {
		text.value = text.value.substring(0, startIndex) + format + selectedText + text.value.substring(endIndex);
	}
}
function charLimit(form, text) {

	var input = document.getElementById(form);

	var text = document.getElementById(text);

	var length = input.value.length;

	var maxLength = input.getAttribute("maxlength");

	if (length >= maxLength) {
		text.style.color = "#E53E3E";
	}
	else if (length >= maxLength * .72){
		text.style.color = "#FFC107";
	}
	else {
		text.style.color = "#A0AEC0";
	}

	text.innerText = length + ' / ' + maxLength;

}

function hide_image(){
	x=document.getElementById('image-upload-block');
	url=document.getElementById('post-URL').value;
	if (url.length>=1){
		x.classList.add('d-none');
	}
	else {
		x.classList.remove('d-none');
	}
}

function autoSuggestTitle()	{

	var urlField = document.getElementById("post-URL");

	var titleField = document.getElementById("post-title");

	var isValidURL = urlField.checkValidity();

	if (isValidURL && urlField.value.length > 0 && titleField.value === "") {

		var x = new XMLHttpRequest();
		x.withCredentials=true;
		x.onreadystatechange = function() {
			if (x.readyState == 4 && x.status == 200) {

				title=JSON.parse(x.responseText)["title"];
				titleField.value=title;

				checkForRequired()
			}
		}
		x.open('get','/submit/title?url=' + urlField.value);
		x.send(null);

	};

};

function checkForRequired() {

	var title = document.getElementById("post-title");

	var url = document.getElementById("post-URL");

	var text = document.getElementById("post-text");

	var button = document.getElementById("create_button");

	var image = document.getElementById("file-upload");

	if (url.value.length > 0 || image.value.length > 0) {
		text.required = false;
		url.required=false;
	} else if (text.value.length > 0 || image.value.length > 0) {
		url.required = false;
	} else {
		text.required = true;
		url.required = true;
	}

	var isValidTitle = title.checkValidity();

	var isValidURL = url.checkValidity();

	var isValidText = text.checkValidity();

	if (isValidTitle && (isValidURL || image.value.length>0)) {
		button.disabled = false;
	} else if (isValidTitle && isValidText) {
		button.disabled = false;
	} else {
		button.disabled = true;
	}
}


function markdown() {
	var input = document.getElementById('post-text').value;

	var emojis = Array.from(input.matchAll(/:(.{1,30}?):/gi))
	if(emojis != null){
		for(i = 0; i < emojis.length; i++){
			var emoji = emojis[i][0]
			var remoji = emoji.replace(/:/g,'');
			if (remoji.startsWith("!#") || remoji.startsWith("#!"))
			{
				input = input.replace(emoji, "<img class='emj mirrored' src='/assets/images/emojis/" + remoji.substring(2) + ".webp'>")
			} else if (remoji.startsWith("#"))
			{
				input = input.replace(emoji, "<img class='emj' src='/assets/images/emojis/" + remoji.substring(1) + ".webp'>")
			} else if (remoji.startsWith("!"))
			{
				input = input.replace(emoji, "<img height=30 class='emj mirrored' src='/assets/images/emojis/" + remoji.substring(1) + ".webp'>")
			} else {
				input = input.replace(emoji, "<img height=30 class='emj' src='/assets/images/emojis/" + remoji + ".webp'>")
			}
		}
	}

	var options = Array.from(input.matchAll(/\s*\$\$([^\$\n]+)\$\$\s*/gi))
	if(options != null){
		for(i = 0; i < options.length; i++){
			var option = options[i][0];
			var option2 = option.replace(/\$\$/g, '').replace(/\n/g, '')
			input = input.replace(option, '');
			input += '<div class="custom-control"><input type="checkbox" class="custom-control-input" id="' + option2 + '"><label class="custom-control-label" for="' + option2 + '">' + option2 + ' - <a>0 votes</a></label></div>';
		}
	}

	document.getElementById('preview').innerHTML = marked(input)
}

document.onpaste = function(event) {
	f=document.getElementById('file-upload');
	files = event.clipboardData.files
	filename = files[0].name.toLowerCase()
	if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".png") || filename.endsWith(".webp") || filename.endsWith(".gif"))
	{
		f.files = files;
		document.getElementById('filename-show').textContent = filename;
		document.getElementById('urlblock').classList.add('d-none');
		var fileReader = new FileReader();
		fileReader.readAsDataURL(f.files[0]);
		fileReader.addEventListener("load", function () {document.getElementById('image-preview').setAttribute('src', this.result);});  
		document.getElementById('file-upload').setAttribute('required', 'false');
		checkForRequired();
	}
}

document.getElementById('file-upload').addEventListener('change', function(){
	f=document.getElementById('file-upload');
	document.getElementById('urlblock').classList.add('d-none');
	document.getElementById('filename-show').textContent = document.getElementById('file-upload').files[0].name;
	filename = f.files[0].name.toLowerCase()
	if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".png") || filename.endsWith(".webp") || filename.endsWith(".webp"))
	{
		var fileReader = new FileReader();
		fileReader.readAsDataURL(f.files[0]);
		fileReader.addEventListener("load", function () {document.getElementById('image-preview').setAttribute('src', this.result);});  
		checkForRequired();
	}
})