// wow https://stackoverflow.com/questions/3891641/regex-test-only-works-every-other-time
// watch out for places we need to set `lastIndex` ... :frown:

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}))|localhost)(?:\:(?<port>[0-9]{1,6}))?)\b(?<path>[-a-zA-Z0-9@:%_{}\[\]<>\(\)\+.~&\/="]*?(?<extension>\.[^\.?/#"\n<>]+)?)(?:\?(?<query>[a-zA-Z0-9!$%&<>()*+,-\.\/\:\;\=\?\@_~"]+))?(?:#(?<hash>[a-zA-Z0-9!$&'()*+,-\.\/\:\;\=\?\@_~"]*?))?(?:$|\s)/gim;

const VIDEO_ID_EXTRACTOR =
	/(?<video_domain>vimeo\.com|youtu(?:be\.com|\.be|be\.googleapis\.com))(?:\/(?<action>video|embed|watch|shorts|v))?.*(?:(?:\/|v=)(?<video_id>[A-Za-z0-9._%-]*))\S*/gi;
const SPOTIFY_EXTRACTOR =
	/^\/(?<item_type>(?:album|artist|episode|playlist|tracks?))\/?(?<item_id>[a-zA-Z0-9]{22})/gi;
const TIDAL_EXTRACTOR =
	/^\/(?:(?<action>.*?)\/)?(?<item_type>(?:album|artist|episode|playlist|tracks?))\/(?<item_id>[0-9]+)/gi;

const URL_MATCH_HANDLERS = [
	// Tidal
	(link_info) => {
		const is_tidal_link = ["tidal.com", "tidalhi.fi"].includes(link_info.domain?.toLowerCase());

		if (!is_tidal_link) {
			return;
		}

		TIDAL_EXTRACTOR.lastIndex = 0;

		const {
			groups: { action, item_type, item_id },
		} = TIDAL_EXTRACTOR.exec(link_info.path ?? "") ?? { groups: {} };

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

		return `
		<div class="embed-container iframe ${item_type.toLowerCase().indexOf("track") === 0 ? "short" : "square"} tidal">
			<div class="embed-actions-container">
				<button class="icon plus" onclick="console.log(\"close\");"/>
				<button class="icon pause" onclick="console.log(\"stop\");"/>
			</div>
			<iframe
			src="https://embed.tidal.com/${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"
			loading="lazy"
			></iframe>
		</div>`;
	},

	// Spotify
	(link_info) => {
		const is_spotify_link = ["spotify.com"].includes(link_info.domain?.toLowerCase());

		if (!is_spotify_link) {
			return;
		}

		SPOTIFY_EXTRACTOR.lastIndex = 0;

		const {
			groups: { item_type, item_id },
		} = SPOTIFY_EXTRACTOR.exec(link_info.path ?? "") ?? { groups: {} };

		if (!item_id) {
			return;
		}

		return `
		<div class="embed-container iframe ${!item_type || item_type.toLowerCase().indexOf("track") === 0 ? "short" : "square"} spotify rounded">
			<div class="embed-actions-container">
				<button class="icon plus" onclick="console.log(\"close\");"/>
				<button class="icon pause" onclick="console.log(\"stop\");"/>
			</div>
			<iframe
			src="https://open.spotify.com/embed/${item_type ?? "track"}/${item_id}"
			allowfullscreen
			allow="clipboard-write; encrypted-media; fullscreen; picture-in-picture"
			loading="lazy"></iframe>
		</div>`;
	},

	// YouTube
	(link_info) => {
		const is_youtube_link = ["youtube.com", "youtu.be", "youtube.googleapis.com"].includes(
			link_info.domain?.toLowerCase(),
		);

		if (!is_youtube_link) {
			return;
		}

		VIDEO_ID_EXTRACTOR.lastIndex = 0;

		const {
			groups: { video_domain, action, video_id },
		} = VIDEO_ID_EXTRACTOR.exec(link_info.url) ?? { groups: {} };

		if (!video_id) {
			return;
		}

		return `
		<div class="embed-container iframe ${action === "shorts" ? "vertical" : "letterbox"} youtube">
			<div class="embed-actions-container">
				<button class="icon plus" onclick="console.log(\"close\");"/>
				<button class="icon pause" onclick="console.log(\"stop\");"/>
			</div>
			<iframe
			src="https://www.youtube.com/embed/${video_id}"
			title="YouTube video player"
			allow="clipboard-write; encrypted-media; picture-in-picture; web-share;"
			referrerpolicy="strict-origin-when-cross-origin"
		 	allowfullscreen
			loading="lazy"
			></iframe>
		</div>`;
	},

	// Vimeo
	(link_info) => {
		const is_vimeo_link = ["vimeo.com"].includes(link_info.domain?.toLowerCase());

		if (!is_vimeo_link) {
			return;
		}

		VIDEO_ID_EXTRACTOR.lastIndex = 0;

		const {
			groups: { video_domain, action, video_id },
		} = VIDEO_ID_EXTRACTOR.exec(link_info.url) ?? { groups: {} };

		if (!video_id) {
			return;
		}

		return `
		<div class="embed-container iframe letterbox vimeo">
			<div class="embed-actions-container">
				<button class="icon plus" onclick="console.log(\"close\");"/>
				<button class="icon pause" onclick="console.log(\"stop\");"/>
			</div>
			<iframe
			src="https://player.vimeo.com/video/${video_id}"
			frameborder="0"
			allow="fullscreen; picture-in-picture; clipboard-write; encrypted-media; web-share"
			referrerpolicy="strict-origin-when-cross-origin"
			title="Star Trek: Legacy"
			loading="lazy"></iframe>
		</div>`;
	},

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

		if (typeof link_info.extension === "string") {
			const mime_types = get_mime_types(link_info.extension);

			if (mime_types.length) {
				if (mime_types.includes("image/gif")) {
					return `<div class="embed-container image gif"><img src="${link_info.url}" alt="A gif from ${link_info.domain}" /></div>`;
				}

				if (mime_types.includes("video/mp4")) {
					return `<div class="embed-container image gif letterbox"><video autoplay="true" muted="true" loop="true" playsinline="true"><source src="${link_info.url}" type="video/mp4"><a href="${link_info.url}">${link_info.url}</a></video></div>`;
				}

				if (mime_types[0].indexOf("image") === 0) {
					return `<div class="embed-container image"><img src="${link_info.url}" alt="An image from ${link_info.domain}" /></div>`;
				}

				if (mime_types[0].indexOf("audio") === 0) {
					return `
					<div class="audio-container" tabindex="-1">
						<audio controls>
							<source src="${link_info.url}" type="${mime_types[0].indexOf("audio/mpeg") === 0 ? "audio/mpeg" : mime_types[0]}">
							Your browser does not support the audio element.
						</audio>
						<div class="enhanced-audio-player-container">
							<div class="audio-player-display-container">
								<canvas class="audio-player-display"></canvas>
							</div>
							<div class="audio-controls-container">
								<div class="progress-container">
									<div class="time-container"><span class="current">00:00</span></div>
									<div class="slider-container">
										<input type="range" name="progress" title="" min="0" max="1000" step="1" value="0" />
										<label class="time-container" for="progress"><span class="current">00:00</span></label>
									</div>
									<div class="time-container"><span class="duration">00:00</span></div>
								</div>
								<div class="buttons-container">
									<div class="audio-control blank">
										<a href="${link_info.url}" download>
											<div class="icon download"></div>
										</a>
									</div>
									<div class="audio-control skip-back"><div class="icon skip-back"></div></div>
									<div class="audio-control play-pause-toggle"><div class="icon play"></div><div class="icon pause"></div></div>
									<div class="audio-control skip-forward"><div class="icon skip-forward"></div></div>
									<div class="audio-control volume">
										<input type="range" name="volume" title="Volume" min="0" max="100" step="1" value="" />
									</div>
								</div>
							</div>
						</div>
					</div>`;
				}
			}
		}

		return `<a href="${link_info.url}">${link_info.url}</a>`;
	},
];

function message_text_to_html(input) {
	let html_message = (input ?? "").replace(/\n/g, "<br/>");
	let match;

	URL_MATCHING_REGEX.lastIndex = 0;
	while ((match = URL_MATCHING_REGEX.exec(input)) !== null) {
		const url = match[0];

		const {
			groups: { protocol, host, hostname, domain, tld, path, extension, query, hash },
		} = match;

		for (const handler of URL_MATCH_HANDLERS) {
			const result = handler({
				url,
				protocol,
				host,
				hostname,
				domain,
				tld,
				path,
				extension,
				query,
				hash,
			});

			if (typeof result === "string") {
				html_message = html_message.replace(url, result);
				break;
			}
		}
	}

	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(topic_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 message_id = event.id.substring(0, 49);
	const html_content = `<div id="chat-${message_id}" class="message-container ${user_tick_tock_class} ${time_tick_tock_class}" data-creator_id="${creator.id}">
	<div class="message-actions-container">
		<input
			type="checkbox"
			id="show_message_actions-${message_id}"
			class="message-actions-display-toggle"
		/>
		<label class="message-actions-display-toggle-label" for="show_message_actions-${message_id}">
			<div class="icon more-borderless"></div>
		</label>

		<button class="message-action" data-action="react"><i class="icon more-circle"></i><span class="action-name">React</span></button>
		<button class="message-action" data-action="reply" onclick="document.getElementById( 'parent-id' ).value = '${message_id}';"><i class="icon reply"></i><span class="action-name">Reply</span></button>
		<button class="message-action" data-action="forward_copy"><i class="icon forward-copy"></i><span class="action-name">Copy Link</span></button>
		<button class="message-action" data-action="delete"><i class="icon trash"></i><span class="action-name">Delete</span></button>
	</div>
	<div class="info-container">
		<div class="avatar-container">
			<img src="${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 {
		topic_chat_content.insertAdjacentHTML("beforeend", html_content);
	}
}

async function get_new_topic_element() {
	const existing_new_topic_element = document.getElementById("new-topic");
	if (existing_new_topic_element) {
		return existing_new_topic_element;
	}

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

	const new_topic_element = document.getElementById("new-topic");
	return new_topic_element;
}

const users = {};
async function append_topic_events(events) {
	const topic_chat_content = document.getElementById("topic-chat-content");
	let last_message_id = topic_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 !== topic_chat_content.dataset.last_message_id) {
			topic_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-${event.id.substring(0, 49)}`) ??
			(event.meta?.temp_id
				? document.getElementById(`chat-${event.meta.temp_id}`)
				: undefined);
		render_text_event(topic_chat_content, event, users[event.creator_id], existing_element);
	}

	topic_chat_content.scrollTop = topic_chat_content.scrollHeight;
}

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

	if (!topic_id) {
		return;
	}

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

	topic_polling_request_abort_controller =
		topic_polling_request_abort_controller || new AbortController();

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

async function load_topic(topic_id) {
	const topic_chat_content = document.getElementById("topic-chat-content");

	if (topic_polling_request_abort_controller) {
		topic_polling_request_abort_controller.abort();
		topic_polling_request_abort_controller = null;
		delete topic_chat_content.dataset.last_message_id;
	}

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

	const topic = await topic_response.json();

	topic_chat_content.dataset.topic_id = topic.id;
	topic_chat_content.innerHTML = "";

	const topic_selectors = document.querySelectorAll("li.topic");
	for (const topic_selector of topic_selectors) {
		topic_selector.classList.remove("active");
		if (topic_selector.id === `topic-selector-${topic_id}`) {
			topic_selector.classList.add("active");
		}
	}

	const events_response = await api.fetch(
		`/api/topics/${topic_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_topic_events(events);
	poll_for_new_events(topic_id);
}

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

	const topics_response = await api.fetch("/api/topics");
	if (topics_response.ok) {
		const topic_list = document.getElementById("topic-list");
		topic_list.innerHTML = "";
		const topics = await topics_response.json();
		for (const topic of topics) {
			topic_list.insertAdjacentHTML(
				"beforeend",
				`<li id="topic-selector-${topic.id}" class="topic"><a href="#/chat/topic/${topic.id}">${topic.name}</a></li>`,
			);
		}

		last_topic_update = now;
	}
}
window.addEventListener("locationchange", update_chat_topics);

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

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

	const first_topic_id = document.querySelector("li.topic")?.id.substring(14);

	// #/chat/topic/{topic_id}
	//             ^ 12
	const topic_id = hash.substring(12) || first_topic_id;

	if (!topic_id) {
		setTimeout(check_for_topic_in_url, 100);
		return;
	}

	const topic_chat_container = document.getElementById("topic-chat-container");

	if (topic_chat_container.dataset.topic_id !== topic_id) {
		window.location.hash = `/chat/topic/${topic_id}`;
		topic_chat_container.dataset.topic_id = topic_id;
		load_topic(topic_id);
	}
}
window.addEventListener("locationchange", check_for_topic_in_url);

document.addEventListener("DOMContentLoaded", async () => {
	await update_chat_topics();
	check_for_topic_in_url();
});