import {
	createSelector,
	type Accessor,
	type Setter,
	createSignal,
	type ResourceActions,
	createEffect,
	onMount,
	Show,
	on,
	batch,
} from "solid-js";
import "./Playlist.css";
import { getItemName, type PlayerState, type PlaylistItem, type AppOptions } from "../types";
import { formatTime, LocalStorageValues, toast } from "../utils";
import { ClearSVG, DownloadSVG, DownSVG, DragSVG, LinkSVG, SaveSVG, SyncSVG, UpSVG } from "./SVG";
import { savePlaylist, download, storedFilesLive } from "../offline";
import { DraggableList } from "./DraggableList";
import type { FlatFileListing } from "../App";

interface PlaylistProps {
	playlist: Accessor<PlaylistItem[]>;
	setPlaylist: Setter<PlaylistItem[]>;
	playerState: PlayerState;
	setPlayerState: Setter<PlayerState>;
	playTrack: (item: PlaylistItem) => void;
	playNext: () => void;
	audioElement: HTMLAudioElement;
	options: AppOptions;
	fetchFiles: ResourceActions<FlatFileListing>;
}

export default function Playlist(props: PlaylistProps) {
	const [showActionButtons, setShowActionButtons] = createSignal(true);
	function removeFromPlaylist(id: string) {
		props.playNext();
		const newPlaylist = props.playlist().filter((i) => i.id !== id);
		props.setPlaylist(newPlaylist);
	}

	async function playlistDownload(download: boolean) {
		try {
			const playlist = props.playlist();
			const filePaths = playlist.map((item) => item.path);
			const response = await fetch("/prepare-playlist", { body: JSON.stringify(filePaths), method: "POST" });
			if (!response.ok) throw new Error(`Generating playlist id not successful: ${await response.text()}`);
			const id = await response.text();
			if (download) {
				toast("Started playlist download", "info");
				const a = document.createElement("a");
				a.href = `/download-playlist/${id}`;
				document.body.appendChild(a);
				a.click();
				document.body.removeChild(a);
			} else {
				toast("Copied playlist link to clipboard", "info");
				const urlPath = location.href.split(/\?|#/)[0];
				navigator.clipboard.writeText(`${urlPath}${urlPath.endsWith("/") ? "" : "/"}download-playlist/${id}`);
			}
		} catch (e) {
			toast("Playlist items download failed", "error", e);
		}
	}

	const [syncing, setSyncing] = createSignal(false);
	async function syncPlaylist() {
		if (syncing()) return;
		setSyncing(true);
		const progressToast = toast("Syncing files in playlist...", "progress");
		try {
			const itemsToSync: PlaylistItem[] = [];
			const playlist = props.playlist();
			const unique = playlist.filter((item, pos) => playlist.indexOf(item) === pos);
			const storedFiles = storedFilesLive();
			for (const item of unique) {
				if (!storedFiles.includes(item.path)) itemsToSync.push(item);
			}
			let downloadPromises!: Promise<void>[];
			batch(() => {
				downloadPromises = itemsToSync.map((item) => {
					const basePath = item.path.split("/").slice(0, -1).join("/");
					const fileName = item.path.split("/").toReversed()[0];
					return download(fileName, item, basePath, props.options, props.fetchFiles);
				});
			});
			await Promise.allSettled(downloadPromises);
			toast("Playlist sync completed", "success");
		} catch (e) {
			toast("Playlist sync failed", "error", e);
		} finally {
			progressToast.hideToast();
			setSyncing(false);
		}
	}

	let dialogElement!: HTMLDialogElement;
	let playlistNameInput!: HTMLInputElement;
	let allowOverwriteCheckbox!: HTMLInputElement;

	async function save() {
		try {
			if (!playlistNameInput.reportValidity()) return;
			await savePlaylist({ name: playlistNameInput.value, items: props.playlist() }, allowOverwriteCheckbox.checked);
			closeDialog();
		} catch (e) {
			if (e instanceof Error && e.name === "ConstraintError") {
				toast("Playlist with this name already exists", "error");
			} else {
				toast("Saving playlist failed", "error", e);
			}
		}
	}

	function closeDialog() {
		dialogElement.close();
		playlistNameInput.value = "";
		allowOverwriteCheckbox.checked = false;
	}

	const [syncedCount, setSyncedCount] = createSignal(0);
	createEffect(
		on([props.playlist, storedFilesLive], async ([playlist, storedFiles]) => {
			setSyncedCount(playlist.filter((item) => storedFiles.includes(item.path)).length);
		}),
	);
	onMount(() => {
		const savedPlaylistButtons = localStorage.getItem(LocalStorageValues.playlistButtons);
		if (savedPlaylistButtons !== null) setShowActionButtons(savedPlaylistButtons === "true");
		createEffect(() => localStorage.setItem(LocalStorageValues.playlistButtons, showActionButtons().toString()));
	});

	return (
		<div class="playlist-container">
			<dialog class="save-dialog" ref={dialogElement} onclick={(e) => e.target.nodeName === "DIALOG" && closeDialog()}>
				<div>
					<input ref={playlistNameInput} required type="text" placeholder="Playlist name" />
					<div class="save-buttons">
						<label for="overwrite-checkbox">allow overwrite</label>
						<input ref={allowOverwriteCheckbox} id="overwrite-checkbox" type="checkbox" />
						<button onClick={save}>Save</button>
						<button onClick={closeDialog}>Cancel</button>
					</div>
				</div>
			</dialog>

			<div class="playlist-header">
				<div class="playlist-header-title">
					<span>
						Playlist ({props.playlist().length} tracks, {syncedCount()} synced)
					</span>
					<button title="Toggle playlist actions" onclick={() => setShowActionButtons(!showActionButtons())}>
						{showActionButtons() ? <UpSVG /> : <DownSVG />}
					</button>
				</div>
				<Show when={showActionButtons()}>
					<div class="button-container">
						<button title="Save playlist" onClick={() => dialogElement.showModal()}>
							<SaveSVG />
						</button>
						<button title="Sync all unsynced files in playlist" onClick={syncPlaylist} disabled={syncing()}>
							<SyncSVG />
						</button>
						<button
							title="Copies and 1-hour valid link for the same action as the download button"
							onClick={() => playlistDownload(false)}
						>
							<LinkSVG />
						</button>
						<button
							title="Download all files in the playlist in their original format as a .tar file, or without archive if it contains just a single item"
							onClick={() => playlistDownload(true)}
						>
							<DownloadSVG />
						</button>
						<button title="Clear Playlist" onClick={() => props.setPlaylist([])}>
							<ClearSVG />
						</button>
					</div>
				</Show>
			</div>

			<DraggableList<PlaylistItem> items={props.playlist} setItems={props.setPlaylist} id="playlist">
				{(item, _, { dragHandlers, isDragging, dropPosition }) => {
					const isActive = createSelector(
						() => props.playerState.currentTrack?.id,
						(itemId, currentId) => currentId === itemId,
					);
					return (
						<div
							classList={{
								"playlist-item": true,
								"draggable-item": true,
								active: isActive(item.id),
								"drop-target-top-border": dropPosition() === "before",
								"drop-target-bottom-border": dropPosition() === "after",
							}}
							style={{ opacity: isDragging() ? 0.5 : 1 }}
							onClick={() => props.playTrack(item)}
						>
							<div class="playlist-drag-btn" {...dragHandlers}>
								<DragSVG />
							</div>
							<span>{getItemName(item)}</span>
							<div class="spacer" />
							{formatTime(item.metadata.duration)}
							<button
								title={`Remove ${getItemName(item)}`}
								onClick={(e) => {
									e.stopPropagation();
									removeFromPlaylist(item.id);
								}}
							>
								<ClearSVG />
							</button>
						</div>
					);
				}}
			</DraggableList>
		</div>
	);
}