const reactions_popup_width = 280;
const reactions_popup_height = 280;

const reactions_popup_styling = `
#reactionspopup {
	position: fixed;
	width: ${reactions_popup_width}px;
	height: ${reactions_popup_height}px;
	z-index: 100;
	background: inherit;
	overflow: hidden;
	border: 1px solid var(--border-normal);
	padding: 0.5rem;
	text-align: center;
	visibility: hidden;
	display: none;
	opacity: 0;
}

#reactionspopup[data-shown] {
	visibility: visible;
	display: block;
	opacity: 1;
}

#reactionspopup .icon.close {
	float: right;
	margin: 0.5rem;
}

#reactionspopup input[name="search"] {
	width: 80%;
}

#reactionspopup ul {
	margin-top: 0.5rem;
	padding: 0.5rem;
	text-align: left;
	overflow: scroll;
}

#reactionspopup ul li {
	display: inline-block;
	cursor: pointer;
}

#reactionspopup ul[data-filtered] li {
	display: none;
	visibility: hidden;
}

#reactionspopup ul[data-filtered] li[data-filtered] {
	display: inline-block;
	visibility: visible;
}

#reactionspopup #reactions-names-display {
	position: absolute;
	left: 0;
	bottom: 0;
	right: 0;
	height: 2rem;
	background: inherit;
}

.reaction-container {
	display: inline-block;
	border: 1px solid var(--border-subtle);
	border-radius: var(--border-radius);
	margin-right: 0.5rem;
	padding: 0.25rem;
	font-size: large;
}

@media screen and (max-width: 480px) {
	#reactionspopup {
		left: 0 !important;
		right: 0 !important;
		bottom: 0 !important;
		top: auto !important;
		width: 100% !important;
	}
}


`;

let reactions_popup;
let reactions_popup_form;
let reactions_popup_search_input;
let reactions_popup_parent_id_input;
let reactions_popup_emojis_list;
let reactions_popup_reaction_input;

function open_reactions_popup(event) {
	const parent_event_id =
		event.target?.closest("[data-current_event_id]")?.dataset?.current_event_id;
	reactions_popup_parent_id_input.value = parent_event_id ?? "";

	const position = get_best_coords_for_popup({
		target_element: event.target.closest("[data-reactions]"),
		popup: {
			width: reactions_popup_width,
			height: reactions_popup_height,
		},
		offset: {
			x: 25,
			y: 25,
		},
	});

	reactions_popup.style.left = position.x + "px";
	reactions_popup.style.top = position.y + "px";

	reactions_popup.dataset.shown = true;
	reactions_popup_search_input.focus();
}

function clear_reactions_popup() {
	if (!reactions_popup) {
		return;
	}

	delete reactions_popup.dataset.shown;
}

document.addEventListener("DOMContentLoaded", () => {
	if (!document.getElementById("reactions-styling")) {
		const style = document.createElement("style");
		style.id = "reactions-styling";
		style.innerHTML = reactions_popup_styling;
		document.head.appendChild(style);
	}

	reactions_popup = document.createElement("div");

	reactions_popup.id = "reactionspopup";
	reactions_popup.innerHTML = `
<div class="icon close" onclick="clear_reactions_popup()"></div>
<form
		id="reactions-selection-form"
		data-smart="true"
		method="POST"
		on_reply="async (event) => { clear_reactions_popup(); await document.querySelectorAll( '[data-feed]' ).forEach((feed) => feed.__render(event)); }"
		on_parsed="async (event) => { clear_reactions_popup(); await document.querySelectorAll( '[data-feed]' ).forEach((feed) => feed.__render(event)); }"
>
		<input id="reactions-search-input" name="search" type="text" placeholder="Search..." data-skip="true" />

		<input type="hidden" name="type" value="reaction" />

		<input
			type="hidden"
			name="id"
			generator="(_input, form) => 'TEMP-' + form.__submitted_at.toISOString()"
			reset-on-submit
		/>
		<input
			type="hidden"
			name="meta.temp_id"
			generator="(_input, form) => 'TEMP-' + form.__submitted_at.toISOString()"
			reset-on-submit
		/>

		<input
			type="hidden"
			name="creator_id"
			generator="() => { return APP.user?.id; }"
		/>

		<input
			type="hidden"
			name="timestamps.created"
			generator="(_input, form) => form.__submitted_at.toISOString()"
			reset-on-submit
		/>
		<input
			type="hidden"
			name="timestamps.updated"
			generator="(_input, form) => form.__submitted_at.toISOString()"
			reset-on-submit
		/>

		<input type="hidden" name="parent_id" reset-on-submit />

		<input type="hidden" name="data.reaction" reset-on-submit />
		<ul id="reactions-emojis-list">
			${Object.keys(EMOJIS.MAP)
				.map(
					(emoji) =>
						`<li data-emoji="${emoji}" data-names="${EMOJIS.MAP[emoji].map((name) => `:${name}:`).join(" ")}">${emoji}</li>`,
				)
				.join("\n")}
		</ul>
</form>
<div id="reactions-names-display"></div>
`;

	document.body.appendChild(reactions_popup);

	reactions_popup_form = document.getElementById("reactions-selection-form");
	APP.on("topic_changed", ({ topic_id }) => {
		const reaction_topic_id = topic_id ?? document.body.dataset.topic;
		reactions_popup_form.action = reaction_topic_id
			? `/api/topics/${reaction_topic_id}/events`
			: "";
	});

	reactions_popup_search_input = document.getElementById("reactions-search-input");
	reactions_popup_parent_id_input = reactions_popup_form.querySelector('[name="parent_id"]');
	reactions_popup_emojis_list = document.getElementById("reactions-emojis-list");
	reactions_popup_reaction_input = reactions_popup_form.querySelector('[name="data.reaction"]');
	reactions_popup_names_display = document.getElementById("reactions-names-display");

	reactions_popup_emojis_list.querySelectorAll("li[data-emoji]").forEach((emoji_selector) => {
		emoji_selector.addEventListener("click", (event) => {
			event.preventDefault();

			const selector = event.target;
			const emoji = selector.dataset.emoji;

			reactions_popup_reaction_input.value = emoji;
			reactions_popup_form.requestSubmit();
		});
	});

	reactions_popup_form.addEventListener("mouseover", (event) => {
		reactions_popup_names_display.textContent = event.target.matches("li[data-names]")
			? event.target.dataset.names
			: "";
	});

	const debounced_search = debounce((event) => {
		const prompt = event.target?.value;
		const filtered = EMOJIS.autocomplete(prompt);

		delete reactions_popup_emojis_list.dataset.filtered;
		if (filtered.length) {
			reactions_popup_emojis_list.dataset.filtered = true;
			reactions_popup_emojis_list.querySelectorAll("li").forEach((li) => {
				if (filtered.some((entry) => entry[0] === li.dataset.emoji)) {
					li.dataset.filtered = true;
				} else {
					delete li.dataset.filtered;
				}
			});
		}
	}, 200);

	reactions_popup_search_input.addEventListener("input", debounced_search);
	reactions_popup_search_input.addEventListener("paste", debounced_search);
	reactions_popup_search_input.addEventListener("change", debounced_search);

	document.querySelector("body").addEventListener("click", (event) => {
		const is_in_the_reactions_form = event?.target?.closest("#reactionspopup");
		if (is_in_the_reactions_form) {
			return;
		}

		const is_a_data_reactions_child = event?.target?.closest("[data-reactions]");
		if (!is_a_data_reactions_child) {
			clear_reactions_popup();
			return;
		}

		event.preventDefault();
		open_reactions_popup(event);
	});
});