import React from "react"
import * as antd from "antd"
import classnames from "classnames"
import ReactMarkdown from "react-markdown"
import remarkGfm from "remark-gfm"
import fuse from "fuse.js"

import { WithPlayerContext } from "@contexts/WithPlayerContext"
import { Context as PlaylistContext } from "@contexts/WithPlaylistContext"

import useWsEvents from "@hooks/useWsEvents"
import checkUserIdIsSelf from "@utils/checkUserIdIsSelf"

import LoadMore from "@components/LoadMore"
import { Icons } from "@components/Icons"
import MusicTrack from "@components/Music/Track"
import SearchButton from "@components/SearchButton"
import ImageViewer from "@components/ImageViewer"

import MusicModel from "@models/music"

import "./index.less"

const PlaylistTypeDecorators = {
	single: () => (
		<span className="playlistType">
			<Icons.MdMusicNote />
			Single
		</span>
	),
	album: () => (
		<span className="playlistType">
			<Icons.MdAlbum />
			Album
		</span>
	),
	ep: () => (
		<span className="playlistType">
			<Icons.MdAlbum />
			EP
		</span>
	),
	mix: () => (
		<span className="playlistType">
			<Icons.MdMusicNote />
			Mix
		</span>
	),
}

const PlaylistInfo = (props) => {
	return (
		<div>
			<ReactMarkdown
				remarkPlugins={[remarkGfm]}
				children={props.data.description}
			/>
		</div>
	)
}

const MoreMenuHandlers = {
	edit: async (playlist) => {},
	delete: async (playlist) => {
		return antd.Modal.confirm({
			title: "Are you sure you want to delete this playlist?",
			onOk: async () => {
				const result = await MusicModel.deletePlaylist(
					playlist._id,
				).catch((err) => {
					console.log(err)

					app.message.error("Failed to delete playlist")

					return null
				})

				if (result) {
					app.navigation.goToMusic()
				}
			},
		})
	},
}

const PlaylistView = (props) => {
	const [playlist, setPlaylist] = React.useState(props.playlist)
	const [searchResults, setSearchResults] = React.useState(null)
	const [owningPlaylist, setOwningPlaylist] = React.useState(
		checkUserIdIsSelf(props.playlist?.user_id),
	)

	const moreMenuItems = React.useMemo(() => {
		const items = [
			{
				key: "edit",
				label: "Edit",
			},
		]

		if (!playlist.type || playlist.type === "playlist") {
			if (checkUserIdIsSelf(playlist.user_id)) {
				items.push({
					key: "delete",
					label: "Delete",
				})
			}
		}

		return items
	})

	const contextValues = {
		playlist_data: playlist,
		owning_playlist: owningPlaylist,
		add_track: (track) => {},
		remove_track: (track) => {},
	}

	let debounceSearch = null

	const makeSearch = (value) => {
		//TODO: Implement me using API
		return app.message.info("Not implemented yet...")
	}

	const handleOnSearchChange = (value) => {
		debounceSearch = setTimeout(() => {
			makeSearch(value)
		}, 500)
	}

	const handleOnSearchEmpty = () => {
		if (debounceSearch) {
			clearTimeout(debounceSearch)
		}

		setSearchResults(null)
	}

	const handleOnClickPlaylistPlay = () => {
		app.cores.player.start(playlist.items)
	}

	const handleOnClickViewDetails = () => {
		app.layout.modal.open("playlist_info", PlaylistInfo, {
			props: {
				data: playlist,
			},
		})
	}

	const handleOnClickTrack = (track) => {
		// search index of track
		const index = playlist.items.findIndex((item) => {
			return item._id === track._id
		})

		if (index === -1) {
			return
		}

		// check if clicked track is currently playing
		if (app.cores.player.state.track_manifest?._id === track._id) {
			app.cores.player.playback.toggle()
		} else {
			app.cores.player.start(playlist.items, {
				startIndex: index,
			})
		}
	}

	const handleUpdateTrackLike = (track_id, liked) => {
		setPlaylist((prev) => {
			const index = prev.list.findIndex((item) => {
				return item._id === track_id
			})

			if (index !== -1) {
				const newState = {
					...prev,
				}

				newState.list[index].liked = liked

				return newState
			}

			return prev
		})
	}

	const handleTrackChangeState = (track_id, update) => {
		setPlaylist((prev) => {
			const index = prev.list.findIndex((item) => {
				return item._id === track_id
			})

			if (index !== -1) {
				const newState = {
					...prev,
				}

				newState.list[index] = {
					...newState.list[index],
					...update,
				}

				return newState
			}

			return prev
		})
	}

	const handleMoreMenuClick = async (e) => {
		const handler = MoreMenuHandlers[e.key]

		if (typeof handler !== "function") {
			throw new Error(`Invalid menu handler [${e.key}]`)
		}

		return await handler(playlist)
	}

	useWsEvents(
		{
			"music:track:toggle:like": (data) => {
				handleUpdateTrackLike(data.track_id, data.action === "liked")
			},
		},
		{
			socketName: "music",
		},
	)

	React.useEffect(() => {
		setPlaylist(props.playlist)
		setOwningPlaylist(checkUserIdIsSelf(props.playlist?.user_id))
	}, [props.playlist])

	if (!playlist) {
		return <antd.Skeleton active />
	}

	const playlistType = playlist.type?.toLowerCase() ?? "playlist"

	return (
		<PlaylistContext.Provider value={contextValues}>
			<WithPlayerContext>
				<div className={classnames("playlist_view")}>
					{!props.noHeader && (
						<div className="play_info_wrapper">
							<div className="play_info">
								<div className="play_info_cover">
									<ImageViewer
										src={
											playlist.cover ??
											playlist?.thumbnail ??
											"/assets/no_song.png"
										}
									/>
								</div>

								<div className="play_info_details">
									<div className="play_info_title">
										{playlist.service === "tidal" && (
											<Icons.SiTidal />
										)}
										{typeof playlist.title ===
										"function" ? (
											playlist.title
										) : (
											<h1>{playlist.title}</h1>
										)}
									</div>

									<div className="play_info_statistics">
										{playlistType &&
											PlaylistTypeDecorators[
												playlistType
											] && (
												<div className="play_info_statistics_item">
													{PlaylistTypeDecorators[
														playlistType
													]()}
												</div>
											)}
										<div className="play_info_statistics_item">
											<p>
												<Icons.MdLibraryMusic />{" "}
												{props.length ??
													playlist.total_length ??
													playlist.items.length}{" "}
												Items
											</p>
										</div>
										{playlist.publisher && (
											<div className="play_info_statistics_item">
												<p
													onClick={() => {
														app.navigation.goToAccount(
															playlist.publisher
																.username,
														)
													}}
												>
													<Icons.MdPerson />
													Publised by{" "}
													<a>
														{
															playlist.publisher
																.username
														}
													</a>
												</p>
											</div>
										)}
									</div>

									<div className="play_info_actions">
										<antd.Button
											type="primary"
											shape="rounded"
											size="large"
											onClick={handleOnClickPlaylistPlay}
										>
											<Icons.MdPlayArrow />
											Play
										</antd.Button>

										{playlist.description && (
											<antd.Button
												icon={<Icons.MdInfo />}
												onClick={
													handleOnClickViewDetails
												}
											/>
										)}

										{owningPlaylist && (
											<antd.Dropdown
												trigger={["click"]}
												placement="bottom"
												menu={{
													items: moreMenuItems,
													onClick:
														handleMoreMenuClick,
												}}
											>
												<antd.Button
													icon={<Icons.MdMoreVert />}
												/>
											</antd.Dropdown>
										)}
									</div>
								</div>
							</div>
						</div>
					)}

					<div className="list">
						{!props.noHeader && playlist.items.length > 0 && (
							<div className="list_header">
								<h1>
									<Icons.MdPlaylistPlay /> Tracks
								</h1>

								<SearchButton
									onChange={handleOnSearchChange}
									onEmpty={handleOnSearchEmpty}
									disabled
								/>
							</div>
						)}

						{playlist.items.length === 0 && (
							<antd.Empty
								description={
									<>
										<Icons.MdLibraryMusic /> This playlist
										its empty!
									</>
								}
							/>
						)}

						{searchResults &&
							searchResults.map((item) => {
								return (
									<MusicTrack
										key={item._id}
										order={item._id}
										track={item}
										onPlay={() => handleOnClickTrack(item)}
										changeState={(update) =>
											handleTrackChangeState(
												item._id,
												update,
											)
										}
									/>
								)
							})}

						{!searchResults && playlist.items.length > 0 && (
							<LoadMore
								className="list_content"
								loadingComponent={() => <antd.Skeleton />}
								onBottom={props.onLoadMore}
								hasMore={props.hasMore}
							>
								<WithPlayerContext>
									{playlist.items.map((item, index) => {
										return (
											<MusicTrack
												order={index + 1}
												track={item}
												onPlay={() =>
													handleOnClickTrack(item)
												}
												changeState={(update) =>
													handleTrackChangeState(
														item._id,
														update,
													)
												}
											/>
										)
									})}
								</WithPlayerContext>
							</LoadMore>
						)}
					</div>
				</div>
			</WithPlayerContext>
		</PlaylistContext.Provider>
	)
}

export default PlaylistView