<script lang="ts">
	import { afterNavigate, goto } from '$app/navigation';
	import { page } from '$app/stores';
	import { AlbumResponseDto, api, AssetResponseDto, ThumbnailFormat, UserResponseDto } from '@api';
	import { onMount } from 'svelte';
	import ArrowLeft from 'svelte-material-icons/ArrowLeft.svelte';
	import Plus from 'svelte-material-icons/Plus.svelte';
	import FileImagePlusOutline from 'svelte-material-icons/FileImagePlusOutline.svelte';
	import ShareVariantOutline from 'svelte-material-icons/ShareVariantOutline.svelte';
	import AssetViewer from '../asset-viewer/asset-viewer.svelte';
	import CircleAvatar from '../shared-components/circle-avatar.svelte';
	import ImmichThumbnail from '../shared-components/immich-thumbnail.svelte';
	import AssetSelection from './asset-selection.svelte';
	import UserSelectionModal from './user-selection-modal.svelte';
	import ShareInfoModal from './share-info-modal.svelte';
	import CircleIconButton from '../shared-components/circle-icon-button.svelte';
	import Close from 'svelte-material-icons/Close.svelte';
	import DeleteOutline from 'svelte-material-icons/DeleteOutline.svelte';
	import FolderDownloadOutline from 'svelte-material-icons/FolderDownloadOutline.svelte';
	import { downloadAssets } from '$lib/stores/download';
	import DotsVertical from 'svelte-material-icons/DotsVertical.svelte';
	import ContextMenu from '../shared-components/context-menu/context-menu.svelte';
	import MenuOption from '../shared-components/context-menu/menu-option.svelte';
	import ThumbnailSelection from './thumbnail-selection.svelte';
	import ControlAppBar from '../shared-components/control-app-bar.svelte';
	import {
		notificationController,
		NotificationType
	} from '../shared-components/notification/notification';
	import { browser } from '$app/environment';
	import { albumAssetSelectionStore } from '$lib/stores/album-asset-selection.store';

	export let album: AlbumResponseDto;
	const { isAlbumAssetSelectionOpen } = albumAssetSelectionStore;

	let isShowAssetViewer = false;

	let isShowAssetSelection = false;

	$: $isAlbumAssetSelectionOpen = isShowAssetSelection;
	$: {
		if (browser) {
			if (isShowAssetSelection) {
				document.body.style.overflow = 'hidden';
			} else {
				document.body.style.overflow = 'auto';
			}
		}
	}
	let isShowShareUserSelection = false;
	let isEditingTitle = false;
	let isCreatingSharedAlbum = false;
	let isShowShareInfoModal = false;
	let isShowAlbumOptions = false;
	let isShowThumbnailSelection = false;

	let selectedAsset: AssetResponseDto;
	let currentViewAssetIndex = 0;

	let viewWidth: number;
	let thumbnailSize = 300;
	let backUrl = '/albums';
	let currentAlbumName = '';
	let currentUser: UserResponseDto;
	let titleInput: HTMLInputElement;
	let contextMenuPosition = { x: 0, y: 0 };

	$: isOwned = currentUser?.id == album.ownerId;

	let multiSelectAsset: Set<AssetResponseDto> = new Set();
	$: isMultiSelectionMode = multiSelectAsset.size > 0;

	afterNavigate(({ from }) => {
		backUrl = from?.url.pathname ?? '/albums';

		if (from?.url.pathname === '/sharing') {
			isCreatingSharedAlbum = true;
		}
	});

	$: {
		if (album.assets?.length < 6) {
			thumbnailSize = Math.floor(viewWidth / album.assetCount - album.assetCount);
		} else {
			thumbnailSize = Math.floor(viewWidth / 6 - 6);
		}
	}

	const getDateRange = () => {
		const startDate = new Date(album.assets[0].createdAt);
		const endDate = new Date(album.assets[album.assetCount - 1].createdAt);

		const timeFormatOption: Intl.DateTimeFormatOptions = {
			month: 'short',
			day: 'numeric',
			year: 'numeric'
		};

		const startDateString = startDate.toLocaleDateString('us-EN', timeFormatOption);
		const endDateString = endDate.toLocaleDateString('us-EN', timeFormatOption);
		return `${startDateString} - ${endDateString}`;
	};

	onMount(async () => {
		currentAlbumName = album.albumName;

		try {
			const { data } = await api.userApi.getMyUserInfo();
			currentUser = data;
		} catch (e) {
			console.log('Error [getMyUserInfo - album-viewer] ', e);
		}
	});

	const viewAssetHandler = (event: CustomEvent) => {
		const { asset }: { asset: AssetResponseDto } = event.detail;

		currentViewAssetIndex = album.assets.findIndex((a) => a.id == asset.id);
		selectedAsset = album.assets[currentViewAssetIndex];
		isShowAssetViewer = true;
		pushState(selectedAsset.id);
	};

	const selectAssetHandler = (event: CustomEvent) => {
		const { asset }: { asset: AssetResponseDto } = event.detail;
		let temp = new Set(multiSelectAsset);

		if (multiSelectAsset.has(asset)) {
			temp.delete(asset);
		} else {
			temp.add(asset);
		}

		multiSelectAsset = temp;
	};

	const clearMultiSelectAssetAssetHandler = () => {
		multiSelectAsset = new Set();
	};

	const removeSelectedAssetFromAlbum = async () => {
		if (window.confirm('Do you want to remove selected assets from the album?')) {
			try {
				const { data } = await api.albumApi.removeAssetFromAlbum(album.id, {
					assetIds: Array.from(multiSelectAsset).map((a) => a.id)
				});

				album = data;
				multiSelectAsset = new Set();
			} catch (e) {
				console.error('Error [album-viewer] [removeAssetFromAlbum]', e);
				notificationController.show({
					type: NotificationType.Error,
					message: 'Error removing assets from album, check console for more details'
				});
			}
		}
	};
	const navigateAssetForward = () => {
		try {
			if (currentViewAssetIndex < album.assetCount - 1) {
				currentViewAssetIndex++;
				selectedAsset = album.assets[currentViewAssetIndex];
				pushState(selectedAsset.id);
			}
		} catch (e) {
			console.error(e);
		}
	};

	const navigateAssetBackward = () => {
		try {
			if (currentViewAssetIndex > 0) {
				currentViewAssetIndex--;
				selectedAsset = album.assets[currentViewAssetIndex];
				pushState(selectedAsset.id);
			}
		} catch (e) {
			console.error(e);
		}
	};

	const pushState = (assetId: string) => {
		// add a URL to the browser's history
		// changes the current URL in the address bar but doesn't perform any SvelteKit navigation
		history.pushState(null, '', `${$page.url.pathname}/photos/${assetId}`);
	};

	const closeViewer = () => {
		isShowAssetViewer = false;
		history.pushState(null, '', `${$page.url.pathname}`);
	};

	// Update Album Name
	$: {
		if (!isEditingTitle && currentAlbumName != album.albumName && isOwned) {
			api.albumApi
				.updateAlbumInfo(album.id, {
					albumName: album.albumName
				})
				.then(() => {
					currentAlbumName = album.albumName;
				})
				.catch((e) => {
					console.error('Error [updateAlbumInfo] ', e);
					notificationController.show({
						type: NotificationType.Error,
						message: "Error updating album's name, check console for more details"
					});
				});
		}
	}

	const createAlbumHandler = async (event: CustomEvent) => {
		const { assets }: { assets: AssetResponseDto[] } = event.detail;
		try {
			const { data } = await api.albumApi.addAssetsToAlbum(album.id, {
				assetIds: assets.map((a) => a.id)
			});

			if (data.album) {
				album = data.album;
			}
			isShowAssetSelection = false;
		} catch (e) {
			console.error('Error [createAlbumHandler] ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error creating album, check console for more details'
			});
		}
	};

	const assetUploadedToAlbumHandler = async (event: CustomEvent) => {
		const { assetIds }: { assetIds: string[] } = event.detail;
		try {
			const { data } = await api.albumApi.addAssetsToAlbum(album.id, {
				assetIds: assetIds
			});

			if (data.album) {
				album = data.album;
			}
		} catch (e) {
			console.error('Error [assetUploadedToAlbumHandler] ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error adding asset to album, check console for more details'
			});
		}
	};

	const addUserHandler = async (event: CustomEvent) => {
		const { selectedUsers }: { selectedUsers: UserResponseDto[] } = event.detail;

		try {
			const { data } = await api.albumApi.addUsersToAlbum(album.id, {
				sharedUserIds: Array.from(selectedUsers).map((u) => u.id)
			});

			album = data;

			isShowShareUserSelection = false;
		} catch (e) {
			console.error('Error [addUserHandler] ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error adding users to album, check console for more details'
			});
		}
	};

	const sharedUserDeletedHandler = async (event: CustomEvent) => {
		const { userId }: { userId: string } = event.detail;

		if (userId == 'me') {
			isShowShareInfoModal = false;
			goto(backUrl);
		}

		try {
			const { data } = await api.albumApi.getAlbumInfo(album.id);

			album = data;
			isShowShareInfoModal = false;
		} catch (e) {
			console.error('Error [sharedUserDeletedHandler] ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error deleting share users, check console for more details'
			});
		}
	};

	const removeAlbum = async () => {
		if (
			window.confirm(
				`Are you sure you want to delete album ${album.albumName}? If the album is shared, other users will not be able to access it.`
			)
		) {
			try {
				await api.albumApi.deleteAlbum(album.id);
				goto(backUrl);
			} catch (e) {
				console.error('Error [userDeleteMenu] ', e);
				notificationController.show({
					type: NotificationType.Error,
					message: 'Error deleting album, check console for more details'
				});
			}
		}
	};

	const downloadAlbum = async () => {
		try {
			const fileName = album.albumName + '.zip';

			// If assets is already download -> return;
			if ($downloadAssets[fileName]) {
				return;
			}

			$downloadAssets[fileName] = 0;

			let total = 0;
			const { data, status } = await api.albumApi.downloadArchive(album.id, {
				responseType: 'blob',
				onDownloadProgress: function (progressEvent) {
					const request = this as XMLHttpRequest;
					if (!total) {
						total = Number(request.getResponseHeader('X-Immich-Content-Length-Hint')) || 0;
					}

					if (total) {
						const current = progressEvent.loaded;
						$downloadAssets[fileName] = Math.floor((current / total) * 100);
					}
				}
			});

			if (!(data instanceof Blob)) {
				return;
			}

			if (status === 200) {
				const fileUrl = URL.createObjectURL(data);
				const anchor = document.createElement('a');
				anchor.href = fileUrl;
				anchor.download = fileName;

				document.body.appendChild(anchor);
				anchor.click();
				document.body.removeChild(anchor);

				URL.revokeObjectURL(fileUrl);

				// Remove item from download list
				setTimeout(() => {
					const copy = $downloadAssets;
					delete copy[fileName];
					$downloadAssets = copy;
				}, 2000);
			}
		} catch (e) {
			console.error('Error downloading file ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error downloading file, check console for more details.'
			});
		}
	};

	const showAlbumOptionsMenu = (event: CustomEvent) => {
		contextMenuPosition = {
			x: event.detail.mouseEvent.x,
			y: event.detail.mouseEvent.y
		};

		isShowAlbumOptions = !isShowAlbumOptions;
	};

	const setAlbumThumbnailHandler = (event: CustomEvent) => {
		const { asset }: { asset: AssetResponseDto } = event.detail;
		try {
			api.albumApi.updateAlbumInfo(album.id, {
				albumThumbnailAssetId: asset.id
			});
		} catch (e) {
			console.error('Error [setAlbumThumbnailHandler] ', e);
			notificationController.show({
				type: NotificationType.Error,
				message: 'Error setting album thumbnail, check console for more details'
			});
		}

		isShowThumbnailSelection = false;
	};
</script>

<section class="bg-immich-bg dark:bg-immich-dark-bg">
	<!-- Multiselection mode app bar -->
	{#if isMultiSelectionMode}
		<ControlAppBar
			on:close-button-click={clearMultiSelectAssetAssetHandler}
			backIcon={Close}
			tailwindClasses={'bg-white shadow-md'}
		>
			<svelte:fragment slot="leading">
				<p class="font-medium text-immich-primary dark:text-immich-dark-primary">
					Selected {multiSelectAsset.size}
				</p>
			</svelte:fragment>
			<svelte:fragment slot="trailing">
				{#if isOwned}
					<CircleIconButton
						title="Remove from album"
						on:click={removeSelectedAssetFromAlbum}
						logo={DeleteOutline}
					/>
				{/if}
			</svelte:fragment>
		</ControlAppBar>
	{/if}

	<!-- Default app bar -->
	{#if !isMultiSelectionMode}
		<ControlAppBar on:close-button-click={() => goto(backUrl)} backIcon={ArrowLeft}>
			<svelte:fragment slot="trailing">
				{#if album.assetCount > 0}
					<CircleIconButton
						title="Add Photos"
						on:click={() => (isShowAssetSelection = true)}
						logo={FileImagePlusOutline}
					/>

					<!-- Share and remove album -->
					{#if isOwned}
						<CircleIconButton
							title="Share"
							on:click={() => (isShowShareUserSelection = true)}
							logo={ShareVariantOutline}
						/>
						<CircleIconButton title="Remove album" on:click={removeAlbum} logo={DeleteOutline} />
					{/if}

					<CircleIconButton
						title="Download"
						on:click={() => downloadAlbum()}
						logo={FolderDownloadOutline}
					/>

					<CircleIconButton
						title="Album options"
						on:click={(event) => showAlbumOptionsMenu(event)}
						logo={DotsVertical}
					/>
				{/if}

				{#if isCreatingSharedAlbum && album.sharedUsers.length == 0}
					<button
						disabled={album.assetCount == 0}
						on:click={() => (isShowShareUserSelection = true)}
						class="immich-text-button border bg-immich-primary dark:bg-immich-dark-primary text-gray-50 hover:bg-immich-primary/75 px-6 text-sm disabled:opacity-25 disabled:bg-gray-500 disabled:cursor-not-allowed dark:text-immich-dark-bg dark:border-immich-dark-gray"
						><span class="px-2">Share</span></button
					>
				{/if}
			</svelte:fragment>
		</ControlAppBar>
	{/if}

	<section class="m-auto my-[160px] w-[60%]">
		<input
			on:keydown={(e) => {
				if (e.key == 'Enter') {
					isEditingTitle = false;
					titleInput.blur();
				}
			}}
			on:focus={() => (isEditingTitle = true)}
			on:blur={() => (isEditingTitle = false)}
			class={`transition-all text-6xl text-immich-primary dark:text-immich-dark-primary w-[99%] border-b-2 border-transparent outline-none ${
				isOwned ? 'hover:border-gray-400' : 'hover:border-transparent'
			} focus:outline-none focus:border-b-2 focus:border-immich-primary dark:focus:border-immich-dark-primary bg-immich-bg dark:bg-immich-dark-bg dark:focus:bg-immich-dark-gray`}
			type="text"
			bind:value={album.albumName}
			disabled={!isOwned}
			bind:this={titleInput}
		/>

		{#if album.assetCount > 0}
			<p class="my-4 text-sm text-gray-500 font-medium">{getDateRange()}</p>
		{/if}

		{#if album.shared}
			<div class="my-6 flex">
				{#each album.sharedUsers as user}
					{#key user.id}
						<span class="mr-1">
							<CircleAvatar {user} on:click={() => (isShowShareInfoModal = true)} />
						</span>
					{/key}
				{/each}

				<button
					style:display={isOwned ? 'block' : 'none'}
					on:click={() => (isShowShareUserSelection = true)}
					title="Add more users"
					class="h-12 w-12 border bg-white transition-colors hover:bg-gray-300 text-3xl flex place-items-center place-content-center rounded-full"
					>+</button
				>
			</div>
		{/if}

		{#if album.assetCount > 0}
			<div class="flex flex-wrap gap-1 w-full pb-20" bind:clientWidth={viewWidth}>
				{#each album.assets as asset}
					{#key asset.id}
						{#if album.assetCount < 7}
							<ImmichThumbnail
								{asset}
								{thumbnailSize}
								format={ThumbnailFormat.Jpeg}
								on:click={(e) =>
									isMultiSelectionMode ? selectAssetHandler(e) : viewAssetHandler(e)}
								on:select={selectAssetHandler}
								selected={multiSelectAsset.has(asset)}
							/>
						{:else}
							<ImmichThumbnail
								{asset}
								{thumbnailSize}
								on:click={(e) =>
									isMultiSelectionMode ? selectAssetHandler(e) : viewAssetHandler(e)}
								on:select={selectAssetHandler}
								selected={multiSelectAsset.has(asset)}
							/>
						{/if}
					{/key}
				{/each}
			</div>
		{:else}
			<!-- Album is empty - Show asset selectection buttons -->
			<section id="empty-album" class=" mt-[200px] flex place-content-center place-items-center">
				<div class="w-[300px]">
					<p class="text-xs dark:text-immich-dark-fg">ADD PHOTOS</p>
					<button
						on:click={() => (isShowAssetSelection = true)}
						class="w-full py-8 border bg-immich-bg dark:bg-immich-dark-gray text-immich-fg dark:text-immich-dark-fg dark:hover:text-immich-dark-primary rounded-md mt-5 flex place-items-center gap-6 px-8 transition-all hover:bg-gray-100 hover:text-immich-primary dark:border-none"
					>
						<span class="text-text-immich-primary dark:text-immich-dark-primary"
							><Plus size="24" />
						</span>
						<span class="text-lg">Select photos</span>
					</button>
				</div>
			</section>
		{/if}
	</section>
</section>

<!-- Overlay Asset Viewer -->
{#if isShowAssetViewer}
	<AssetViewer
		asset={selectedAsset}
		on:navigate-previous={navigateAssetBackward}
		on:navigate-next={navigateAssetForward}
		on:close={closeViewer}
	/>
{/if}

{#if isShowAssetSelection}
	<AssetSelection
		assetsInAlbum={album.assets}
		on:go-back={() => (isShowAssetSelection = false)}
		on:create-album={createAlbumHandler}
		on:asset-uploaded={assetUploadedToAlbumHandler}
	/>
{/if}

{#if isShowShareUserSelection}
	<UserSelectionModal
		on:close={() => (isShowShareUserSelection = false)}
		on:add-user={addUserHandler}
		sharedUsersInAlbum={new Set(album.sharedUsers)}
	/>
{/if}

{#if isShowShareInfoModal}
	<ShareInfoModal
		on:close={() => (isShowShareInfoModal = false)}
		{album}
		on:user-deleted={sharedUserDeletedHandler}
	/>
{/if}

{#if isShowAlbumOptions}
	<ContextMenu {...contextMenuPosition} on:clickoutside={() => (isShowAlbumOptions = false)}>
		{#if isOwned}
			<MenuOption
				on:click={() => {
					isShowThumbnailSelection = true;
					isShowAlbumOptions = false;
				}}
				text="Set album cover"
			/>
		{/if}
	</ContextMenu>
{/if}

{#if isShowThumbnailSelection}
	<ThumbnailSelection
		{album}
		on:close={() => (isShowThumbnailSelection = false)}
		on:thumbnail-selected={setAlbumThumbnailHandler}
	/>
{/if}
