function add_tag(event) {
	input_tag = event.target.closest('.tag');
	post_id = input_tag.closest('.post_container').id;
	tag_name = input_tag.children[0].value;
	fetch(url_prefix + '/add_tag', {
		method: 'POST',
		headers: {'Content-Type': 'application/json'},
		body: JSON.stringify({
			'post_id': post_id,
			'tag_name': tag_name,
		})
	}).then(function(response) {
		if(!response.ok) { throw new Error('Error adding tag!'); }
		return response.json();
	}).then(function(json) {
		if (!json.ok) { throw new Error('Could not add tag.') }
		event.target.parentElement.firstElementChild.value = '';
		let tag = document.createElement('span');
		tag.innerText = tag_name;
		tag.className = 'tag';
		let span = document.createElement('span');
		span.className = 'tag_button';
		span.addEventListener('click', remove_tag);
		span.innerText = '-';
		tag.appendChild(span);
		input_tag.closest('.tags').insertBefore(tag, input_tag);
	});
}

function remove_tag(event) {
	tag = event.target.closest('.tag');
	post_id = tag.closest('.post_container').id;
	tag_name = tag.innerText.replace(/ .*/, '');
	fetch(url_prefix + '/remove_tag', {
		method: 'POST',
		headers: {'Content-Type': 'application/json'},
		body: JSON.stringify({
			'post_id': post_id,
			'tag_name': tag_name,
		})
	}).then(function(response) {
		if(!response.ok) { throw new Error('Error removing tag!'); }
		return response.json();
	}).then(function(json) {
		if (!json.ok) { throw new Error('Could not remove tag.') }
		tag.remove();
	});
}

function toggle_visibility_menu(event) {
	let menu = document.querySelector('#visibility_menu');
	if (menu.style.display == 'block') {
		menu.style.display = 'none';
	} else if (menu.style.display == 'none') {
		menu.style.display = 'block';
	}
}

function toggle_visibility(event) {
	console.log(event);
	let tag = event.target.parentElement.parentElement.cells[0].innerText;
	let vis_class = ['faded', 'hidden'];
	if (tag == 'non-qm posts') {
		for (let post of document.querySelectorAll('.post_container:not(.qm_post)')) {
			if (event.target.checked) {
				post.classList.add(vis_class[event.target.parentElement.cellIndex - 1]);
			} else {
				post.classList.remove(vis_class[event.target.parentElement.cellIndex - 1]);
			}
		}
	} else {
		for (let post of document.querySelectorAll('.' + tag)) {
			if (event.target.checked) {
				post.classList.add(vis_class[event.target.parentElement.cellIndex - 1]);
			} else {
				post.classList.remove(vis_class[event.target.parentElement.cellIndex - 1]);
			}
		}
	}
}