@inherits LocalizableComponentBase
@using System.Globalization

@* The server's own custom emoji, for administrators (/clientapi/admin/emoji, EmojiService), grouped by category: each
   with its picture, its :shortcode:, whether its picker offers it and whether it is disabled (kept, but offered and shown
   nowhere). One is added with a shortcode, a category and a picture streamed from the file (PNG, GIF, WebP or JPEG,
   256 KB at most), and changed in the same dialog (its category, the picker, disabled, a new picture; never its
   shortcode, its id on other servers), which shows PrivaPub's refusals: 409 for a shortcode taken, 422 for a picture it
   won't take. Deleting one is asked first: the posts and profiles using it show its shortcode as text. Every change
   reads the server's emoji for everyone again (EmojiService.Refresh), so this client's picker has it at once. *@
<div class="flex flex-col gap-3 w-full" data-emoji-panel>
	<div class="flex flex-wrap items-center gap-2 pointer-coarse:gap-2">
		<DButton Size="DSize.Sm" Color="DColor.Primary" Disabled="IsDefaultDisabled" OnClick="New" data-emoji-new>
			<i class="ion-md-add" aria-hidden="true"></i><span>@Localizer["Add an emoji"]</span>
		</DButton>
		<DButton Size="DSize.Sm" Disabled="IsDefaultDisabled" OnClick="Reload" data-emoji-reload>
			<i class="ion-md-refresh" aria-hidden="true"></i><span>@Localizer["Read again"]</span>
		</DButton>
	</div>
	<p class="text-xs opacity-70">@Localizer["Everyone here can use them in posts, names and reactions, and other servers show them. The picker offers those in it; one written out as :shortcode: works too, unless it is disabled."]</p>

	@if (IsLoading)
	{
		<p class="flex w-full items-center justify-center gap-2">
			<DLoading Variant="DLoadingVariant.Dots" LabelText="@Localizer["loading"]" />
			@Localizer["loading"]
		</p>
	}
	else if (emojis.Count == 0)
	{
		<p class="text-sm opacity-70" data-emoji-empty>@Localizer["No custom emoji yet."]</p>
	}

	@foreach (var group in Groups)
	{
		<section class="flex flex-col gap-2" data-emoji-group="@group.Key">
			<h3 class="text-sm font-semibold">@(group.Key is { Length: > 0 } category ? category : Localizer["No category"])</h3>
			<ul class="flex flex-col gap-2">
				@foreach (var emoji in group)
				{
					<li @key="emoji.Shortcode" class="flex flex-wrap items-center gap-2 pointer-coarse:gap-2 p-2 rounded-lg neo-raised neo-2xs @(emoji.Disabled ? "opacity-60" : null)"
						data-emoji="@emoji.Shortcode" data-emoji-state="@StateOf(emoji)">
						<img alt="@($":{emoji.Shortcode}:")" loading="lazy" draggable="false" class="h-10 w-10 flex-none object-contain rounded" src="@emoji.Url" />
						<span class="flex flex-col min-w-0 flex-1">
							<b class="truncate font-mono text-sm" title="@emoji.Uri">@($":{emoji.Shortcode}:")</b>
							<span class="text-xs opacity-70" title="@emoji.ImageUpdatedAt.ToLocalTime().ToString(SUtility.dateTimeFormatExt)">
								@emoji.Size.GetFileSize(Localizer) · @Localizer["Changed {0} ago", emoji.UpdatedAt.GetPassedTime(Localizer)]
							</span>
						</span>
						<span class="flex flex-wrap items-center gap-1">
							@if (emoji.ContentType == "image/gif")
							{
								<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Outline">@Localizer["Animated"]</DBadge>
							}
							@if (emoji.Disabled)
							{
								<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Soft" Color="DColor.Error">@Localizer["Disabled"]</DBadge>
							}
							else if (!emoji.VisibleInPicker)
							{
								<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Soft" Color="DColor.Warning">@Localizer["Not in the picker"]</DBadge>
							}
						</span>
						<span class="flex items-center gap-2 pointer-coarse:gap-2">
							<DButton Size="DSize.Sm" Disabled="IsDefaultDisabled || busy.Contains(emoji.Shortcode)" OnClick="() => Edit(emoji)" data-emoji-edit>
								<i class="ion-md-create" aria-hidden="true"></i><span>@Localizer["Edit"]</span>
							</DButton>
							<DButton Size="DSize.Sm" Disabled="IsDefaultDisabled || busy.Contains(emoji.Shortcode)" OnClick="() => Delete(emoji)" data-emoji-delete>
								<i class="ion-md-trash text-error" aria-hidden="true"></i><span>@Localizer["Delete"]</span>
							</DButton>
						</span>
					</li>
				}
			</ul>
		</section>
	}
</div>

@if (isEditing)
{
	<DModal Placement="DModalPlacement.ResponsiveBottom" IsOpen="true" IsOpenChanged="Closed" CloseText="@Localizer["Close"]" data-emoji-dialog>
		<Heading>@(editedEmoji is null ? Localizer["New emoji"] : Localizer["Edit :{0}:", editedEmoji.Shortcode])</Heading>
		<ChildContent>
			<EditForm Model="form" OnValidSubmit="Save" class="flex flex-col gap-3 mt-3">
				<DataAnnotationsValidator />
				<label class="flex flex-col gap-1">
					<span class="text-sm">@Localizer["Shortcode"]</span>
					<DInput TValue="string" class="w-full font-mono" @bind-Value="form.Shortcode" Immediate="true" autocomplete="off" maxlength="64"
							readonly="@(editedEmoji is not null)" spellcheck="false" data-emoji-shortcode>
						<Prefix><span aria-hidden="true">:</span></Prefix>
						<Suffix><span aria-hidden="true">:</span></Suffix>
					</DInput>
					<span class="text-xs opacity-70">
						@(editedEmoji is null
							? Localizer["Letters, digits and underscores, 2 to 64 of them. It never changes: other servers know the emoji by it."]
							: Localizer["A shortcode never changes: other servers know the emoji by it."])
					</span>
				</label>
				<label class="flex flex-col gap-1">
					<span class="text-sm">@Localizer["Category"]</span>
					<DInput TValue="string" class="w-full" @bind-Value="form.Category" Immediate="true" autocomplete="off" maxlength="64" list="emoji-categories"
							placeholder="@Localizer["None"]" data-emoji-category />
					<datalist id="emoji-categories">
						@foreach (var category in Categories)
						{
							<option value="@category"></option>
						}
					</datalist>
					<span class="text-xs opacity-70">@Localizer["The picker groups the emoji by it."]</span>
				</label>
				<div class="flex flex-col gap-2">
					<span class="text-sm">@Localizer["Picture"]</span>
					<div class="flex flex-wrap items-center gap-3 pointer-coarse:gap-2">
						@if ((preview ?? editedEmoji?.Url) is { Length: > 0 } shown)
						{
							<img alt="@Localizer["Picture"]" class="h-12 w-12 flex-none object-contain rounded neo-inset neo-2xs" src="@shown"
								 data-emoji-preview="@(preview is null ? "current" : "picked")" />
						}
						<DFileInput Size="DSize.Sm" class="flex-1 min-w-48" Accept="@Accept" OnChange="Pick" disabled="@(IsDefaultDisabled || isSaving)"
									aria-label="@Localizer["Picture"]" data-emoji-picture />
					</div>
					<span class="text-xs opacity-70">@Localizer["PNG, GIF, WebP or JPEG, {0} at most. The server fits it within 256 px and keeps a GIF's animation.", EmojiService.MaxPictureBytes.GetFileSize(Localizer)]</span>
					@if (editedEmoji is not null)
					{
						<span class="text-xs opacity-70">@Localizer["Without a new one, it keeps its picture."]</span>
					}
				</div>
				<div class="flex flex-col gap-1">
					<DToggle LabelText="@Localizer["In the picker"]" @bind-Value="form.VisibleInPicker" data-emoji-picker />
					<span class="text-xs opacity-70">@Localizer["Offered in the picker of every client. Out of it, it is still taken when its shortcode is written."]</span>
				</div>
				<div class="flex flex-col gap-1">
					<DToggle LabelText="@Localizer["Disabled"]" @bind-Value="form.Disabled" data-emoji-disabled />
					<span class="text-xs opacity-70">@Localizer["Kept, but offered nowhere, taken into no new post and shown in none."]</span>
				</div>
				<div data-emoji-error="@errorStatus">
					<ErrorViewer AdditionalError="@error" AdditionalErrors="pictureErrors" />
				</div>
				<div class="flex justify-end gap-2 pointer-coarse:gap-2">
					<DButton OnClick="Close" data-emoji-cancel>@Localizer["Cancel"]</DButton>
					<DButton Type="submit" Color="DColor.Primary" Disabled="IsDefaultDisabled || isSaving" data-emoji-save>
						@if (isSaving)
						{
							<DLoading Size="DSize.Sm" LabelText="@Localizer["loading"]" />
						}
						<span>@Localizer["Save"]</span>
					</DButton>
				</div>
			</EditForm>
		</ChildContent>
	</DModal>
}

@code {
	[Inject] EmojiService EmojiService { get; set; }
	[Inject] ConfirmService Confirm { get; set; }
	[Inject] ILoggingService Logger { get; set; }

	static readonly string Accept = string.Join(',', EmojiService.PictureTypes.Concat([".png", ".gif", ".webp", ".jpg", ".jpeg"]));

	List<ViewLocalEmoji> emojis = [];
	HashSet<string> busy = [];
	// the dialog: a new emoji (no editedEmoji) or the one being changed, as the form will save it
	bool isEditing;
	ViewLocalEmoji editedEmoji;
	LocalEmojiForm form = new();
	// the picture picked, streamed from the file when the form is saved, and a small copy of it to show
	IBrowserFile picture;
	string preview;
	List<string> pictureErrors = [];
	// what PrivaPub answered, and its status (data-emoji-error: 409 a shortcode taken, 422 a picture refused, 400 invalid)
	string error;
	string errorStatus;
	bool isSaving;

	// those with no category first, then by category
	List<IGrouping<string, ViewLocalEmoji>> Groups =>
	[
		.. emojis.OrderBy(e => e.Shortcode, StringComparer.OrdinalIgnoreCase)
			.GroupBy(e => e.Category ?? string.Empty)
			.OrderBy(g => g.Key.Length == 0 ? 0 : 1)
			.ThenBy(g => g.Key, StringComparer.CurrentCultureIgnoreCase)
	];

	List<string> Categories => [.. emojis.Select(e => e.Category).Where(c => c is { Length: > 0 }).Distinct().Order(StringComparer.CurrentCultureIgnoreCase)];

	static string StateOf(ViewLocalEmoji emoji) => emoji.Disabled ? "disabled" : emoji.VisibleInPicker ? "picker" : "hidden";

	protected override async Task OnInitializedAsync()
	{
		if (CascadingState.IsOffline)
		{
			WhenOnline(LoadData);
			StartOnlinePolling();
			IsLoading = false;
			return;
		}

		await LoadData();
		IsLoading = false;
	}

	async Task LoadData() => emojis = await EmojiService.List();

	async Task Reload()
	{
		IsLoading = true;
		await LoadData();
		IsLoading = false;
	}

	void New() => Open(null, new LocalEmojiForm());

	void Edit(ViewLocalEmoji emoji) => Open(emoji, new LocalEmojiForm
	{
		Shortcode = emoji.Shortcode,
		Category = emoji.Category,
		VisibleInPicker = emoji.VisibleInPicker,
		Disabled = emoji.Disabled
	});

	void Open(ViewLocalEmoji emoji, LocalEmojiForm editing)
	{
		editedEmoji = emoji;
		form = editing;
		picture = null;
		preview = null;
		pictureErrors = [];
		error = null;
		errorStatus = null;
		isEditing = true;
	}

	void Close()
	{
		isEditing = false;
		picture = null;
		preview = null;
	}

	void Closed(bool open)
	{
		if (!open)
			Close();
	}

	async Task Pick(InputFileChangeEventArgs eventArgs)
	{
		pictureErrors = [];
		picture = null;
		preview = null;
		var file = eventArgs.File;
		if (!EmojiService.PictureTypes.Contains(EmojiService.TypeOf(file)))
		{
			pictureErrors.Add(Localizer["\"{0}\" is not a kind of file this server takes.", file.Name]);
			return;
		}
		if (file.Size > EmojiService.MaxPictureBytes)
		{
			pictureErrors.Add(Localizer["Supplied file \"{0}\" with size {1} exceeds the maximum of {2}.", file.Name, file.Size.GetFileSize(Localizer),
				EmojiService.MaxPictureBytes.GetFileSize(Localizer)]);
			return;
		}

		picture = file;
		preview = await Preview(file);
	}

	// a small copy the browser makes (a GIF's first frame); none when it can't
	async Task<string> Preview(IBrowserFile file)
	{
		try
		{
			var small = await file.RequestImageFileAsync("image/png", 96, 96);
			await using var stream = small.OpenReadStream(EmojiService.MaxPictureBytes);
			using var buffer = new MemoryStream();
			await stream.CopyToAsync(buffer);
			return $"data:image/png;base64,{Convert.ToBase64String(buffer.ToArray())}";
		}
		catch (Exception ex)
		{
			await Logger.ProcessWarning($"No preview of {file.Name}: {ex.Message}", $"{nameof(EmojiPanel)}.{nameof(Preview)}");
			return default;
		}
	}

	async Task Save()
	{
		error = null;
		errorStatus = null;
		if (editedEmoji is null && picture is null)
		{
			pictureErrors = [Localizer["Choose a picture."]];
			return;
		}

		isSaving = true;
		var result = editedEmoji is null ? await EmojiService.Insert(form, picture) : await EmojiService.Update(form, picture);
		isSaving = false;
		if (result.IsInvalid)
		{
			error = result.ErrorMessage;
			errorStatus = result.StatusCode.ToString(CultureInfo.InvariantCulture);
			return;
		}

		var added = editedEmoji is null;
		Close();
		Toast.AddResponseSuccess(added ? Localizer["Emoji added."] : Localizer["Emoji saved."]);
		if (result.Data is not ViewLocalEmoji saved)
		{
			await LoadData();
			return;
		}

		emojis = [.. emojis.Where(e => e.Shortcode != saved.Shortcode), saved];
	}

	async Task Delete(ViewLocalEmoji emoji)
	{
		if (!await Confirm.Ask(Localizer["Delete :{0}:?", emoji.Shortcode],
				Localizer["It is offered no more, and the posts and profiles that use it show the text :{0}: instead. Other servers keep their copy until they read those posts again.", emoji.Shortcode],
				Localizer["Delete"], true))
			return;

		busy.Add(emoji.Shortcode);
		var result = await EmojiService.Delete(emoji.Shortcode);
		busy.Remove(emoji.Shortcode);
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		emojis = [.. emojis.Where(e => e.Shortcode != emoji.Shortcode)];
		Toast.AddResponseSuccess(Localizer["Emoji deleted."]);
	}
}