@inherits LocalizableComponentBase

@* How the current persona reads what others post: Mastodon's reading preferences (reading:expand:media and
   reading:expand:spoilers), which Mastodon's API only reads (/api/v1/preferences). PrivaPub keeps them for each persona
   and sets them through /clientapi/avatar/private/preferences, so other apps signed in as the persona read them too. The
   cards here follow them as soon as they are saved (CascadingState.Preferences): which media wait behind a button, and
   whether a content warning starts open. *@
<div class="flex flex-col gap-4 w-full" data-reading-preferences>
	@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 (CascadingState.PersonaId is null)
	{
		<p class="w-full text-center"><i class="ion-ios-remove-circle-outline"></i> @Localizer["No persona"]</p>
	}
	else
	{
		<label class="flex flex-col gap-1 max-w-md">
			<span class="text-sm">@Localizer["Pictures, videos and sounds"]</span>
			<DSelect TValue="ExpandMedia" class="w-full" @bind-Value="expandMedia" data-preference-expand-media>
				<option value="@ExpandMedia.Default">@Localizer["Hide those marked sensitive"]</option>
				<option value="@ExpandMedia.ShowAll">@Localizer["Show all of them"]</option>
				<option value="@ExpandMedia.HideAll">@Localizer["Hide all of them"]</option>
			</DSelect>
		</label>
		<DToggle LabelText="@Localizer["Open content warnings"]" @bind-Value="expandSpoilers" data-preference-expand-spoilers />
		<p class="text-xs opacity-70">@Localizer["Kept for this persona on the server: other apps signed in as it read them too."]</p>
		<div class="flex flex-wrap gap-2 pointer-coarse:gap-2 justify-end">
			<DButton Size="DSize.Sm" OnClick="Reset" Disabled="@(IsDefaultDisabled || isSaving || !IsChanged)" data-preferences-reset>@Localizer["Reset"]</DButton>
			<DButton Size="DSize.Sm" Color="DColor.Primary" OnClick="Save" Disabled="@(IsDefaultDisabled || isSaving || !IsChanged)" data-preferences-save>
				@if (isSaving)
				{
					<DLoading Size="DSize.Xs" LabelText="@Localizer["loading"]" />
				}
				<i class="ion-md-checkmark" aria-hidden="true"></i><span>@Localizer["Save"]</span>
			</DButton>
		</div>
	}
</div>

@code {
	[Inject] AuthService AuthService { get; set; }

	// what PrivaPub keeps, and the choices being made
	ViewPersonaPreferences saved = new();
	ExpandMedia expandMedia = ExpandMedia.Default;
	bool expandSpoilers;
	bool isSaving;
	string loadedPersonaId;

	bool IsChanged => expandMedia != ExpandMediaModes.Of(saved.ExpandMedia) || expandSpoilers != saved.ExpandSpoilers;

	protected override async Task OnParametersSetAsync()
	{
		if (CascadingState.PersonaId == loadedPersonaId)
			return;
		loadedPersonaId = CascadingState.PersonaId;

		if (CascadingState.IsOffline)
		{
			saved = CascadingState.Preferences;
			Reset();
			WhenOnline(LoadData);
			StartOnlinePolling();
			IsLoading = false;
			return;
		}

		await LoadData();
		IsLoading = false;
	}

	// read again: another device may have changed them since the persona was chosen here
	async Task LoadData()
	{
		if (CascadingState.PersonaId is null)
			return;

		var read = await AuthService.PersonaPreferences(CascadingState.PersonaId);
		saved = read ?? CascadingState.Preferences;
		if (read is not null && (read.ExpandMedia != CascadingState.Preferences.ExpandMedia || read.ExpandSpoilers != CascadingState.Preferences.ExpandSpoilers))
			CascadingState.PreferencesChanged(read);
		Reset();
	}

	void Reset()
	{
		expandMedia = ExpandMediaModes.Of(saved.ExpandMedia);
		expandSpoilers = saved.ExpandSpoilers;
	}

	async Task Save()
	{
		isSaving = true;
		var result = await AuthService.SavePersonaPreferences(new PersonaPreferencesForm
		{
			AvatarId = CascadingState.PersonaId,
			ExpandMedia = ExpandMediaModes.Name(expandMedia),
			ExpandSpoilers = expandSpoilers
		});
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		saved = (ViewPersonaPreferences)result.Data ?? saved;
		CascadingState.PreferencesChanged(saved);
		Reset();
		Toast.AddResponseSuccess(Localizer["Reading preferences saved."]);
	}
}