const URL_MATCHING_REGEX =
	/(?:(?<protocol>[a-zA-Z]+):\/\/)?(?:(?<auth>(?<username>\S.+)\:(?<password>.+))\@)?(?<host>(?:(?<hostname>[-a-zA-Z0-9\.]+)\.)?(?<domain>[-a-zA-Z0-9]+?\.(?<tld>[-a-zA-Z0-9]{2,64}))(?:\:(?<port>[0-9]{1,6}))?)\b(?<path>[-a-zA-Z0-9@:%_{}\[\]<>\(\)\+.~&\/="]*)(?:\?(?<query>[a-zA-Z0-9!$%&<>()*+,-\.\/\:\;\=\?\@_~"]+))?(?:#(?<hash>[a-zA-Z0-9!$&'()*+,-\.\/\:\;\=\?\@_~"]*?))?/gm;

const URL_MATCH_HANDLERS = [
	(match) => {
		const original_url = match[0];
		const {
			groups: { item_type, item_id },
		} =
			/(?:https?:)?(?:\/\/)?(?:[0-9A-Z-]+\.)?(?:tidalhi.fi\/|tidal.com\/|tidal(?:-nocookie)?\.com\S*?[^\w\s-]).*?(?<item_type>(?:track|album)).*?(?<item_id>[\d]{9,})/gi.exec(
				original_url,
			) ?? { groups: {} };

		if (!(item_type && item_id)) {
			return;
		}

		return `
		<div class="embed-container ${item_type === "album" ? "square" : "short"}">
			<iframe
			src="https://embed.tidal.com/${item_type.at(-1) === "s" ? item_type : `${item_type}s`}/${item_id}"
			allow="encrypted-media"
			sandbox="allow-same-origin allow-scripts allow-forms allow-popups"
			title="TIDAL Embed Player"
			onload="this.style.height=(this.contentWindow.document.body.scrollHeight+20)+'px';"
			/>
		</div>`;
	},

	(match) => {
		const original_url = match[0];
		const {
			groups: { video_id },
		} =
			/(?:https?:)?(?:\/\/)?(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube(?:-nocookie)?\.com\S*?[^\w\s-])(?<video_id>[\w-]{11})(?=[^\w-]|$)(?![?=&+%\w.-]*(?:['"][^<>]*>|<\/a>))[?=&+%\w.-]*/gi.exec(
				original_url,
			) ?? { groups: {} };

		if (!video_id) {
			return;
		}

		return `
		<div class="embed-container letterbox">
			<iframe
			src="https://www.youtube.com/embed/${video_id}"
			title="YouTube video player"
			allow="clipboard-write; encrypted-media; picture-in-picture; web-share;"
			referrerpolicy="strict-origin-when-cross-origin"
		 	allowfullscreen />
			<button class="icon plus" onclick="console.log('hi');" />
			<button class="icon talk" onclick="console.log('hello');" />
		</div>`;
	},

	// url
	(match) => {
		// TODO: punycoding if something has unicode?
		// const punycode = get_punycode();
		// const punycoded_url = punycode.encode(match[0]);
		const groups = match.groups ?? {};

		return `<a href="${groups.protocol ?? "http"}://${groups.host ?? ""}${groups.path ? `/${groups.path}` : ""}${groups.query ? `?${groups.query}` : ""}${groups.hash ? `#${groups.hash}` : ""}">${match[0]}</a>`;
	},
];

function message_text_to_html(input) {
	let html_message = input;
	let match;
	while ((match = URL_MATCHING_REGEX.exec(input)) !== null) {
		for (const handler of URL_MATCH_HANDLERS) {
			const result = handler(match);
			if (typeof result === "string") {
				html_message = html_message.replace(match[0], result);
			}
		}
	}

	return html_message;
}

const time_tick_tock_timeout = 60 * 1000; // 1 minute
let last_event_datetime_value = 0;
let time_tick_tock_class = "time-tock";

let last_creator_id = null;
let user_tick_tock_class = "user-tock";
function render_text_event(room_chat_content, event, creator, existing_element) {
	const event_datetime = datetime_to_local(event.timestamps.created);

	if (event_datetime.value - last_event_datetime_value > time_tick_tock_timeout) {
		time_tick_tock_class = time_tick_tock_class === "time-tick" ? "time-tock" : "time-tick";
	}
	last_event_datetime_value = event_datetime.value;

	if (last_creator_id !== creator.id) {
		user_tick_tock_class = user_tick_tock_class === "user-tick" ? "user-tock" : "user-tick";
		last_creator_id = creator.id;
	}

	const html_content = `<div id="chat-${event.id}" class="message-container ${user_tick_tock_class} ${time_tick_tock_class}" data-creator_id="${creator.id}">
	<div class="info-container">
		<div class="avatar-container">
			<img src="${creator.meta?.avatar ?? "/images/default_avatar.gif"}" alt="user avatar" />
		</div>
		<div class="username-container">
			<span class="username">${creator.username ?? "unknown"}</span>
		</div>
		<div class="datetime-container">
			<span class="long">${event_datetime.long}</span>
			<span class="short">${event_datetime.short}</span>
		</div>
	</div>
	<div class="message-content-container">${message_text_to_html(event.data.message)}</div>
</div>`;

	if (existing_element) {
		const template = document.createElement("template");
		template.innerHTML = html_content;
		existing_element.replaceWith(template.content.firstChild);
	} else {
		room_chat_content.insertAdjacentHTML("beforeend", html_content);
	}
}

async function get_new_room_element() {
	const existing_new_room_element = document.getElementById("new-room");
	if (existing_new_room_element) {
		return existing_new_room_element;
	}

	const room_list = document.getElementById("room-list");
	room_list.insertAdjacentHTML(
		"beforeend",
		`<li id="new-room" class="room"><a href="" contenteditable="true">new room</a></li>`,
	);
	await new Promise((resolve) => setTimeout(resolve, 1));

	const new_room_element = document.getElementById("new-room");
	return new_room_element;
}

const users = {};
async function append_room_events(events) {
	const room_chat_content = document.getElementById("room-chat-content");
	let last_message_id = room_chat_content.dataset.last_message_id ?? "";
	for (const event of events) {
		// if the last message is undefined, it becomes this event, otherwise, if this event's id is newer,
		// it becomes the latest message
		last_message_id =
			event.id > last_message_id && event.id.indexOf("TEMP") !== 0
				? event.id
				: last_message_id;

		// if the last message has been updated, update the content's dataset to reflect that
		if (last_message_id !== room_chat_content.dataset.last_message_id) {
			room_chat_content.dataset.last_message_id = last_message_id;
		}

		users[event.creator_id] =
			users[event.creator_id] ??
			(await (await api.fetch(`/api/users/${event.creator_id}`)).json());

		const existing_element =
			document.getElementById(`chat-${event.id}`) ??
			(event.meta?.temp_id
				? document.getElementById(`chat-${event.meta.temp_id}`)
				: undefined);
		render_text_event(room_chat_content, event, users[event.creator_id], existing_element);
	}

	room_chat_content.scrollTop = room_chat_content.scrollHeight;
}

// TODO: we need some abortcontroller handling here or something
// similar for when we change rooms, this is the most basic
// first pass outline
let room_polling_request_abort_controller = null;
async function poll_for_new_events() {
	const room_chat_content = document.getElementById("room-chat-content");
	const room_id = room_chat_content.dataset.room_id;
	const last_message_id = room_chat_content.dataset.last_message_id;

	if (!room_id) {
		return;
	}

	const message_polling_url = `/api/rooms/${room_id}/events?type=chat&limit=100&sort=newest&wait=true${last_message_id ? `&after_id=${last_message_id}` : ""}`;

	room_polling_request_abort_controller =
		room_polling_request_abort_controller || new AbortController();

	api.fetch(message_polling_url, {
		signal: room_polling_request_abort_controller.signal,
	})
		.then(async (new_events_response) => {
			const new_events = (await new_events_response.json()).reverse();
			await append_room_events(new_events.toReversed());
			poll_for_new_events(room_id);
		})
		.catch((error) => {
			// TODO: poll again? back off?
			console.error(error);
		});
}

async function load_room(room_id) {
	const room_chat_content = document.getElementById("room-chat-content");

	if (room_polling_request_abort_controller) {
		room_polling_request_abort_controller.abort();
		room_polling_request_abort_controller = null;
		delete room_chat_content.dataset.last_message_id;
	}

	const room_response = await api.fetch(`/api/rooms/${room_id}`);
	if (!room_response.ok) {
		const error = await room_response.json();
		alert(error.message ?? JSON.stringify(error));
		return;
	}

	const room = await room_response.json();

	room_chat_content.dataset.room_id = room.id;
	room_chat_content.innerHTML = "";

	const room_selectors = document.querySelectorAll("li.room");
	for (const room_selector of room_selectors) {
		room_selector.classList.remove("active");
		if (room_selector.id === `room-selector-${room_id}`) {
			room_selector.classList.add("active");
		}
	}

	const events_response = await api.fetch(
		`/api/rooms/${room_id}/events?type=chat&limit=100&sort=newest`,
	);
	if (!events_response.ok) {
		const error = await events_response.json();
		alert(error.message ?? JSON.stringify(error));
		return;
	}

	const events = (await events_response.json()).reverse();

	await append_room_events(events);
	poll_for_new_events(room_id);
}

let last_room_update = undefined;
async function update_chat_rooms() {
	const now = new Date();
	const time_since_last_update = now - (last_room_update ?? 0);
	if (time_since_last_update < 5_000) {
		return;
	}

	const rooms_response = await api.fetch("/api/rooms");
	if (rooms_response.ok) {
		const room_list = document.getElementById("room-list");
		room_list.innerHTML = "";
		const rooms = await rooms_response.json();
		for (const room of rooms) {
			room_list.insertAdjacentHTML(
				"beforeend",
				`<li id="room-selector-${room.id}" class="room"><a href="#/talk/room/${room.id}">${room.name}</a></li>`,
			);
		}

		last_room_update = now;
	}
}
window.addEventListener("locationchange", update_chat_rooms);

function check_for_room_in_url() {
	const user_json = document.body.dataset.user;
	if (!user_json) {
		return;
	}

	const hash = window.location.hash;
	const talk_in_url = hash.indexOf("#/talk") === 0;
	if (!talk_in_url) {
		return;
	}

	const first_room_id = document.querySelector("li.room")?.id.substring(14);

	// #/talk/room/{room_id}
	//             ^ 12
	const room_id = hash.substring(12) || first_room_id;

	if (!room_id) {
		setTimeout(check_for_room_in_url, 100);
		return;
	}

	const room_chat_container = document.getElementById("room-chat-container");

	if (room_chat_container.dataset.room_id !== room_id) {
		window.location.hash = `/talk/room/${room_id}`;
		room_chat_container.dataset.room_id = room_id;
		load_room(room_id);
	}
}
window.addEventListener("locationchange", check_for_room_in_url);

document.addEventListener("DOMContentLoaded", async () => {
	await update_chat_rooms();
	check_for_room_in_url();
});