dwelling-files/web/assets/js/main.js

//// OVERLAY FOR VIEWING MEDIA FILES

const video_formats = ["webm", "mp4", "mov"];
const audio_formats = ["mp3", "flac", "opus", "ogg", "m4a"];
const image_formats = ["jpg", "jpeg", "gif", "png", "bmp", "webp"];

const overlay = document.getElementById("overlay");
const overlay_content = overlay.children[1].firstChild;
const overlay_label = overlay.children[1].lastChild;

let g_scale = 1;

let g_current_row = null;
const g_first_row = document.getElementsByTagName("tbody")[0].firstChild;
const g_last_row = document.getElementsByTagName("tbody")[0].lastChild;


const file_links = Array.from(document.getElementsByTagName("tbody")[0].children)
	.filter(e => e.lastChild.innerHTML != "DIR").map(l => l.firstChild.firstChild);


if (localStorage.getItem('audio_volume') == null)
	localStorage['audio_volume'] = 0.5;

function overlay_close() {
	overlay_content.children[0].remove();
	overlay.style.visibility = "hidden";
	g_scale = 1;
}

overlay.addEventListener("mouseup", e => {
	if (e.target.tagName !== "DIV") return;
	if (e.button === 0) overlay_close(); });


function determine_media_element(path) {
	path = path.toLowerCase();
	if (video_formats.some(ext => path.endsWith(ext)))
		return "video";
	else if (audio_formats.some(ext => path.endsWith(ext)))
		return "audio";
	else if (image_formats.some(ext => path.endsWith(ext)))
		return "img";
	return undefined;
}

function send_to_overlay(pathname, media_type_element) {
	if (media_type_element === undefined)
		return false;
	if (overlay_content.children.length != 0)
		overlay_content.children[0].remove();

	const media_element = document.createElement(media_type_element);
	media_element.src = pathname;

	overlay_label.textContent = decodeURI(pathname.substr(pathname.lastIndexOf("/") + 1));

	if (media_type_element !== "audio") {
		media_element.addEventListener("wheel", e => {
			e.preventDefault();
			g_scale = Math.min(Math.max(0.25, g_scale + (e.deltaY * -0.001)), 4);
			e.target.style.transform = `scale(${g_scale})`; });
	}
	if (media_type_element !== "img") {
		media_element.autoplay = media_element.controls = true;
		media_element.addEventListener("volumechange", e => {
			localStorage['audio_volume'] = e.target.volume; });
		media_element.volume = localStorage["audio_volume"];
	}

	overlay_content.appendChild(media_element);
	overlay.style.visibility = "visible";

	return true;
}


const [b_prev, b_next] = overlay.getElementsByTagName("button");

b_prev.addEventListener("click", e => {
	do {
		if (g_current_row.previousSibling === null)
			g_current_row = g_last_row;
		else
			g_current_row = g_current_row.previousSibling;
	} while (!send_to_overlay(g_current_row.firstChild.firstChild.pathname, 
		determine_media_element(g_current_row.firstChild.firstChild.pathname)));
	e.preventDefault();
});

b_next.addEventListener("click", () => {
	do {
		if (g_current_row.nextSibling === null)
			g_current_row = g_first_row;
		else
			g_current_row = g_current_row.nextSibling;
	} while (!send_to_overlay(g_current_row.firstChild.firstChild.pathname,
		determine_media_element(g_current_row.firstChild.firstChild.pathname)));
});

window.addEventListener("keydown", e => {
	if (overlay.style.visibility === "hidden" || e.isComposing)
		return;
	if (e.code === "ArrowLeft")
		b_prev.click();
	else if (e.code === "ArrowRight")
		b_next.click();
	else if (e.code === "Escape")
		overlay_close();
});


for (let i = 0; i < file_links.length; ++i)
	file_links[i].addEventListener("click", e => {
		g_current_row = e.target.parentNode.parentNode;
		if (send_to_overlay(e.target.pathname, determine_media_element(e.target.pathname)))
			e.preventDefault();
	});

//// SORT BY COLUMN

const [thead_name, thead_date, thead_size] = document.getElementsByTagName('thead')[0]
	.children[0].children;
const tbody = document.getElementsByTagName('tbody')[0];

let g_sort_reverse = false;

thead_name.classList.toggle("clickable");
thead_name.addEventListener('click', e => {
	e.preventDefault();
	sortTable((a,b) => {
		const a_name = a.children[0].textContent.toLowerCase();
		const b_name = b.children[0].textContent.toLowerCase();
		return a_name < b_name ? -1 : a_name > b_name ? 1 : 0;
	}, null, null, thead_name, [thead_date, thead_size]);
});

thead_date.classList.toggle("clickable");
thead_date.addEventListener('click', e => {
	e.preventDefault();
	sortTable((a,b) => {
		const a_date = new Date(a.children[1].textContent.slice(0, -4));
		const b_date = new Date(b.children[1].textContent.slice(0, -4));
		return a_date - b_date;
	}, null, null, thead_date, [thead_name, thead_size]);
});

const units = {"B": 0, "KiB": 1, "MiB": 2, "GiB": 3, "TiB": 4};

function sizeToBytes(size, unit) {
	if (units[unit] == 0) return size;
	for (let i = 0; i <= units[unit]; ++i) size *= 1024;
	return size;
}

thead_size.classList.toggle("clickable");
thead_size.addEventListener('click', e => {
	e.preventDefault();
	sortTable(
	(a,b) => {
		if (a.textContent == "DIR")
			return 1;
		let [a_size, a_unit] = a.children[2].textContent.split(" ");
		let [b_size, b_unit] = b.children[2].textContent.split(" ");
		return sizeToBytes(+a_size, a_unit) - sizeToBytes(+b_size, b_unit);
	},
	e => e.children[2].textContent == "DIR",
	e => e.children[2].textContent != "DIR",
	thead_size, [thead_name, thead_date]);
});

function sortTable(compareFn, filterFn, filterNegFn, target, other) {
	let records = Array.from(document.getElementsByTagName('tbody')[0].children);

	let dirs = [];
	if (filterFn != null) {
		dirs = records.filter(filterFn);
		records = records.filter(filterNegFn);
	}

	records.sort(compareFn);

	tbody.textContent = "";

	other.forEach(v => {
		v.classList.remove("sort-up");
		v.classList.remove("sort-down");
	});

	if (filterFn != null)
			tbody.append(...dirs);

	if (g_sort_reverse) {
		tbody.append(...records.reverse());
		target.classList.add("sort-up");
		target.classList.remove("sort-down");
	} else {
		tbody.append(...records);
		target.classList.add("sort-down");
		target.classList.remove("sort-up");
	}
	
	g_sort_reverse = !g_sort_reverse;
}