@page "/groups"
@attribute [Authorize]
@inherits LocalizableComponentBase
<Title>@Localizer["Groups"]</Title>

@* The current persona's communities and circles (/clientapi/group): made, joined by invitation, and left; for the ones
   it runs, edited, their invitation shown, the requests to join answered and members taken out. A circle's members are
   never shown to anyone but its owner and moderators, here as on every server. *@
<section class="block relative w-full h-full neo-inset neo-xs rounded-xl">
	<div class="flex flex-col gap-4 p-4 md:p-5 w-full h-full absolute overflow-y-auto">

		<div class="flex items-center gap-2">
			<i class="ion-md-people text-lg"></i>
			<h1 class="font-bold truncate">@Localizer["Groups"]</h1>
		</div>

		<div class="grid grid-cols-1 lg:grid-cols-2 gap-3">
			<EditForm Model="draft" OnValidSubmit="Create" class="flex flex-col gap-2 p-3 rounded-xl neo-raised neo-xs" data-group-new>
				<DataAnnotationsValidator />
				<b class="text-sm">@Localizer["A new group"]</b>
				<div class="flex flex-wrap gap-2">
					<DInput TValue="string" class="flex-1 min-w-40" @bind-Value="draft.UserName" Immediate="true" autocomplete="off" maxlength="32"
							placeholder="@Localizer["user name (a-z, 0-9, _)"]" data-group-username>
						<Prefix>@@</Prefix>
					</DInput>
					<DInput TValue="string" class="flex-1 min-w-40" @bind-Value="draft.Name" Immediate="true" autocomplete="off" maxlength="64"
							placeholder="@Localizer["Name"]" data-group-name />
				</div>
				<DTextarea @bind-Value="draft.Description" Immediate="true" rows="2" autocomplete="off" maxlength="2000" placeholder="@Localizer["Description"]" />
				<DToggle Size="DSize.Sm" @bind-Value="draft.IsCommunity" LabelText="@Localizer["A community, open to the fediverse (otherwise a private circle)"]" data-group-community />
				@if (draft.IsCommunity)
				{
					<DSelect TValue="string" Size="DSize.Sm" @bind-Value="draft.PostingPolicy" aria-label="@Localizer["Who may post"]">
						<Prefix><i class="ion-md-create"></i></Prefix>
						<ChildContent>
							@foreach (var policy in PostingPolicies)
							{
								<option value="@policy">@PolicyName(policy)</option>
							}
						</ChildContent>
					</DSelect>
					<DToggle Size="DSize.Sm" @bind-Value="draft.IsDiscoverable" LabelText="@Localizer["Listed and found in searches"]" />
				}
				<DToggle Size="DSize.Sm" @bind-Value="draft.ManuallyApprovesMembers" LabelText="@Localizer["Approve members from elsewhere by hand"]" />
				<DInput TValue="string" type="password" @bind-Value="draft.InvitationPassword" Immediate="true" autocomplete="new-password" maxlength="128"
						placeholder="@Localizer["Invitation password (optional)"]" />
				<ErrorViewer />
				<DButton Type="submit" Size="DSize.Sm" Color="DColor.Primary" class="self-end" Disabled="@(IsDefaultDisabled || isSaving)" data-group-create>
					<i class="ion-md-add"></i><span>@Localizer["Make the group"]</span>
				</DButton>
			</EditForm>

			<EditForm Model="joining" OnValidSubmit="Join" class="flex flex-col gap-2 p-3 rounded-xl neo-raised neo-xs" data-group-join>
				<b class="text-sm">@Localizer["Join by invitation"]</b>
				<DInput TValue="string" @bind-Value="joining.InvitationCode" Immediate="true" autocomplete="off" maxlength="64"
						placeholder="@Localizer["Invitation code"]" data-group-code>
					<Prefix><i class="ion-md-key"></i></Prefix>
				</DInput>
				<DInput TValue="string" type="password" @bind-Value="joining.InvitationPassword" Immediate="true" autocomplete="current-password" maxlength="128"
						placeholder="@Localizer["Invitation password, if it has one"]" />
				<DButton Type="submit" Size="DSize.Sm" class="self-end" Disabled="@(IsDefaultDisabled || isSaving || string.IsNullOrWhiteSpace(joining.InvitationCode))" data-group-join-submit>
					<i class="ion-md-log-in"></i><span>@Localizer["Join"]</span>
				</DButton>
			</EditForm>
		</div>

		@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 (groups.Count == 0)
		{
			<p class="w-full text-center" data-feed-empty><i class="ion-ios-remove-circle-outline"></i> @Localizer["This persona is in no group yet."]</p>
		}

		<div class="flex flex-col gap-3">
			@foreach (var group in groups)
			{
				<article class="flex flex-col gap-3 p-3 md:p-4 rounded-xl neo-raised neo-xs" data-group-id="@group.Id">
					<div class="flex flex-wrap items-center gap-2">
						<i class="@(group.IsCommunity ? "ion-md-globe" : "ion-md-lock") text-lg"></i>
						<span class="flex flex-col min-w-0 flex-1">
							<b class="truncate">@(group.Name ?? group.UserName)</b>
							<span class="text-xs opacity-70 truncate">@("@" + group.Handle)</span>
						</span>
						<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Soft">@(group.IsCommunity ? Localizer["Community"] : Localizer["Circle"])</DBadge>
						<span class="text-sm tabular-nums opacity-70" title="@Localizer["Members"]"><i class="ion-md-person"></i> @group.MembersCount</span>
						@if (group.IsOwner)
						{
							<DButton Size="DSize.Sm" Active="@(open?.Id == group.Id)" OnClick="@(() => Toggle(group))" data-group-manage>
								<i class="ion-md-settings"></i><span class="hidden sm:inline">@Localizer["Manage"]</span>
							</DButton>
						}
						else
						{
							<DButton Size="DSize.Sm" Disabled="@(IsDefaultDisabled || isSaving)" OnClick="@(() => Leave(group))" data-group-leave>
								<i class="ion-md-exit"></i><span>@Localizer["Leave"]</span>
							</DButton>
						}
					</div>

					@if (open?.Id == group.Id)
					{
						@if (group.InvitationCode is { Length: > 0 } invitation)
						{
							<div class="flex flex-col gap-1 text-sm">
								<span>@Localizer["Invitation code"]@(group.IsPasswordRequired ? " · " + Localizer["it asks for a password"] : null)</span>
								<input class="input input-sm w-full font-mono text-xs" value="@invitation" readonly autocomplete="off" onfocus="this.select()"
									   aria-label="@Localizer["Invitation code"]" data-group-invitation />
							</div>
						}

						<EditForm Model="edit" OnValidSubmit="Save" class="flex flex-col gap-2">
							<DInput TValue="string" @bind-Value="edit.Name" Immediate="true" autocomplete="off" maxlength="64" aria-label="@Localizer["Name"]" />
							<DTextarea @bind-Value="edit.Description" Immediate="true" rows="2" autocomplete="off" maxlength="2000" aria-label="@Localizer["Description"]" />
							@if (group.IsCommunity)
							{
								<DSelect TValue="string" Size="DSize.Sm" @bind-Value="edit.PostingPolicy" aria-label="@Localizer["Who may post"]">
									<Prefix><i class="ion-md-create"></i></Prefix>
									<ChildContent>
										@foreach (var policy in PostingPolicies)
										{
											<option value="@policy">@PolicyName(policy)</option>
										}
									</ChildContent>
								</DSelect>
								<DToggle Size="DSize.Sm" @bind-Value="editDiscoverable" LabelText="@Localizer["Listed and found in searches"]" />
							}
							<DToggle Size="DSize.Sm" @bind-Value="editApproves" LabelText="@Localizer["Approve members from elsewhere by hand"]" />
							<DInput TValue="string" type="password" @bind-Value="edit.InvitationPassword" Immediate="true" autocomplete="new-password" maxlength="128"
									placeholder="@Localizer["A new invitation password"]" />
							@if (group.IsPasswordRequired)
							{
								<DToggle Size="DSize.Sm" @bind-Value="edit.RemoveInvitationPassword" LabelText="@Localizer["Remove the invitation password"]" />
							}
							<DToggle Size="DSize.Sm" @bind-Value="edit.RegenerateInvitationCode" LabelText="@Localizer["A new invitation code (the old one stops working)"]" />
							<DButton Type="submit" Size="DSize.Sm" Color="DColor.Primary" class="self-end" Disabled="@(IsDefaultDisabled || isSaving)" data-group-save>
								<i class="ion-md-checkmark"></i><span>@Localizer["Save"]</span>
							</DButton>
						</EditForm>

						<h2 class="font-semibold text-sm">@Localizer["Members"] <span class="opacity-60 tabular-nums">@members.Count(m => !m.IsPending)</span></h2>
						<div class="flex flex-col gap-2" data-group-members>
							@foreach (var member in members.OrderBy(m => m.IsPending ? 0 : 1).ThenBy(m => m.Since))
							{
								<div class="flex flex-wrap items-center gap-3 min-w-0" data-member="@member.ActorUri" data-pending="@(member.IsPending ? "true" : "false")">
									@* alt="": the name is next to it. *@
									<img alt="" class="h-8 w-8 flex-none object-cover rounded-full" src="@(member.PictureUrl ?? "imgs/icon-192.png")" />
									<span class="flex flex-col min-w-0 flex-1">
										<b class="truncate text-sm">@(member.Name ?? member.Handle)</b>
										<span class="text-xs opacity-70 truncate">@("@" + member.Handle)</span>
									</span>
									@if (member.IsPending)
									{
										<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Soft" Color="DColor.Warning">@Localizer["asks to join"]</DBadge>
										<DButton Size="DSize.Xs" Color="DColor.Primary" Disabled="@(IsDefaultDisabled || isSaving)" OnClick="@(() => Answer(member, true))" data-member-approve>
											<i class="ion-md-checkmark"></i><span>@Localizer["Let in"]</span>
										</DButton>
										<DButton Size="DSize.Xs" Disabled="@(IsDefaultDisabled || isSaving)" OnClick="@(() => Answer(member, false))" data-member-reject>
											<i class="ion-md-close"></i><span>@Localizer["Decline"]</span>
										</DButton>
									}
									else if (member.Role == "owner")
									{
										<DBadge Size="DSize.Sm" Variant="DBadgeVariant.Soft" Color="DColor.Primary">@Localizer["owner"]</DBadge>
									}
									else
									{
										<DButton Size="DSize.Xs" Disabled="@(IsDefaultDisabled || isSaving)" OnClick="@(() => Remove(member))" title="@Localizer["Take out of the group"]" data-member-remove>
											<i class="ion-md-remove-circle"></i><span class="hidden sm:inline">@Localizer["Take out"]</span>
										</DButton>
									}
								</div>
							}
						</div>
					}
				</article>
			}
		</div>
	</div>
</section>

@code {
	static readonly string[] PostingPolicies = ["followers", "anyone", "moderators"];

	[Inject] GroupService GroupService { get; set; }

	List<ViewGroup> groups = [];
	List<ViewGroupMember> members = [];
	InsertGroupForm draft = new() { PostingPolicy = "followers" };
	JoinGroupForm joining = new();
	UpdateGroupForm edit = new();
	bool editDiscoverable;
	bool editApproves;
	ViewGroup open;
	string loadedPersonaId;
	bool isSaving;

	string PolicyName(string policy) => policy switch
	{
		"anyone" => Localizer["Anyone may post"],
		"moderators" => Localizer["Only its moderators post"],
		_ => Localizer["Its followers post"]
	};

	// The persona changed (NavMenu's switcher): its groups are another persona's.
	protected override async Task OnParametersSetAsync()
	{
		if (CascadingState.PersonaId is null)
		{
			IsLoading = false;
			return;
		}
		if (CascadingState.PersonaId == loadedPersonaId)
			return;
		loadedPersonaId = CascadingState.PersonaId;

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

		await LoadData();
	}

	async Task LoadData()
	{
		IsLoading = true;
		open = null;
		members = [];
		// (the forms are the persona's: validated as they are filled, so they name it from the start)
		draft.AvatarId = CascadingState.PersonaId;
		joining.AvatarId = CascadingState.PersonaId;
		groups = await GroupService.List(CascadingState.PersonaId);
		IsLoading = false;
	}

	async Task Create()
	{
		if (!draft.IsCommunity)
			draft.IsDiscoverable = false;
		isSaving = true;
		var result = await GroupService.Insert(draft);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		var group = (ViewGroup)result.Data;
		draft = new() { AvatarId = CascadingState.PersonaId, PostingPolicy = "followers" };
		Toast.AddResponseSuccess(Localizer["{0} made.", group.Name ?? group.UserName]);
		await LoadData();
		if (groups.FirstOrDefault(g => g.Id == group.Id) is { } made)
			await Toggle(made);
	}

	async Task Join()
	{
		isSaving = true;
		var result = await GroupService.Join(joining);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		var group = (ViewGroup)result.Data;
		joining = new() { AvatarId = CascadingState.PersonaId };
		Toast.AddResponseSuccess(Localizer["You joined {0}.", group.Name ?? group.UserName]);
		await LoadData();
	}

	async Task Leave(ViewGroup group)
	{
		isSaving = true;
		var result = await GroupService.Leave(CascadingState.PersonaId, group.Id);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		groups.Remove(group);
		Toast.AddResponseSuccess(Localizer["You left {0}.", group.Name ?? group.UserName]);
	}

	async Task Toggle(ViewGroup group)
	{
		if (open?.Id == group.Id)
		{
			open = null;
			members = [];
			return;
		}

		open = group;
		edit = new UpdateGroupForm { AvatarId = CascadingState.PersonaId, GroupId = group.Id, Name = group.Name, Description = group.Description, PostingPolicy = group.PostingPolicy };
		editDiscoverable = group.IsDiscoverable;
		editApproves = group.ManuallyApprovesMembers;
		members = await GroupService.Members(CascadingState.PersonaId, group.Id);
	}

	async Task Save()
	{
		edit.IsDiscoverable = open.IsCommunity ? editDiscoverable : null;
		edit.ManuallyApprovesMembers = editApproves;
		if (string.IsNullOrEmpty(edit.InvitationPassword))
			edit.InvitationPassword = null;
		isSaving = true;
		var result = await GroupService.Update(edit);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		var updated = (ViewGroup)result.Data;
		var index = groups.FindIndex(g => g.Id == updated.Id);
		if (index >= 0)
			groups[index] = updated;
		open = updated;
		edit.InvitationPassword = null;
		edit.RemoveInvitationPassword = false;
		edit.RegenerateInvitationCode = false;
		Toast.AddResponseSuccess(Localizer["Saved."]);
	}

	async Task Answer(ViewGroupMember member, bool approve)
	{
		isSaving = true;
		var result = approve
			? await GroupService.Approve(CascadingState.PersonaId, open.Id, member.ActorUri)
			: await GroupService.Reject(CascadingState.PersonaId, open.Id, member.ActorUri);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		members = await GroupService.Members(CascadingState.PersonaId, open.Id);
	}

	async Task Remove(ViewGroupMember member)
	{
		isSaving = true;
		var result = await GroupService.Remove(CascadingState.PersonaId, open.Id, member.ActorUri);
		isSaving = false;
		if (result.IsInvalid)
		{
			Toast.AddResponseError(result);
			return;
		}

		members.Remove(member);
		Toast.AddResponseSuccess(Localizer["{0} is out of the group.", member.Name ?? member.Handle]);
	}
}