yavsc/src/PostIt/PostIt/ViewModels/CirclesPageViewModel.cs

311 lines
10 KiB
C#

using System;
using System.Collections.ObjectModel;
using System.Threading.Tasks;
using Avalonia;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Extensions.DependencyInjection;
using PostIt.Helpers;
using PostIt.Services;
using Yavsc.Api.Client;
using Yavsc.Api.Client.Dtos;
namespace PostIt.ViewModels;
/// <summary>
/// View model for the "Mes cercles" page. CRUD on the caller's own
/// circles (the server scopes every endpoint to the caller's uid
/// since the BlogAcl fix on this branch), plus membership
/// management on the currently selected circle.
///
/// <para>The view lists circles in <see cref="Circles"/>, supports
/// create / edit via <see cref="DraftName"/>, and exposes
/// per-item Delete and per-item edit commands. <see cref="IsBusy"/>
/// drives a progress overlay during API calls; <see cref="StatusMessage"/>
/// surfaces success / error feedback in the view footer.</para>
///
/// <para>When the user selects a circle in the list,
/// <see cref="LoadMembersAsync"/> fetches its members into
/// <see cref="Members"/>. The "Add a member" command
/// (<see cref="OpenAddMemberAsync"/>) is a UI event the view
/// raises to open <c>AddCircleMemberDialog</c>; the dialog
/// raises a <c>Confirmed</c> event back, which the page's
/// code-behind forwards here via
/// <see cref="OnAddMemberConfirmedAsync"/>. The "remove"
/// command is per-row and runs inline.</para>
/// </summary>
public partial class CirclesPageViewModel : ViewModelBase
{
private readonly CircleApiClient _client;
[ObservableProperty]
public partial ObservableCollection<CircleDto> Circles { get; set; } = new();
[ObservableProperty]
public partial CircleDto? SelectedCircle { get; set; }
/// <summary>Editor buffer for the new / edited circle's name.</summary>
[ObservableProperty]
public partial string DraftName { get; set; } = string.Empty;
/// <summary>Editor buffer for the new / edited circle's visibility flag.</summary>
[ObservableProperty]
public partial bool DraftPublic { get; set; }
/// <summary>Members of the currently selected circle. Empty
/// when no circle is selected or after a refresh that
/// produced an empty list. Updated by
/// <see cref="LoadMembersAsync"/>.</summary>
[ObservableProperty]
public partial ObservableCollection<CircleMemberDto> Members { get; set; } = new();
[ObservableProperty]
public partial bool IsBusy { get; set; }
[ObservableProperty]
public partial string StatusMessage { get; set; } = string.Empty;
public CirclesPageViewModel(CircleApiClient client)
{
_client = client ?? throw new ArgumentNullException(nameof(client));
}
public override bool CanNavigateNext { get => throw new NotImplementedException(); protected set => throw new NotImplementedException(); }
public override bool CanNavigatePrevious { get => throw new NotImplementedException(); protected set => throw new NotImplementedException(); }
/// <summary>
/// Partial property setter: when the selected circle
/// changes, refresh the members list. The setter is
/// invoked by the [ObservableProperty] source generator
/// for both user selections and programmatic resets.
/// </summary>
partial void OnSelectedCircleChanged(CircleDto? value)
{
Members = new ObservableCollection<CircleMemberDto>();
if (value is not null)
{
// Fire-and-forget: load members in the background.
// Errors are routed to StatusMessage inside
// LoadMembersAsync.
_ = LoadMembersAsync(value.Id);
}
}
[RelayCommand]
public async Task RefreshAsync()
{
IsBusy = true;
try
{
var list = await _client.GetMyCirclesAsync();
Circles = new ObservableCollection<CircleDto>(list ?? new());
StatusMessage = $"{Circles.Count} cercle(s)";
}
catch (Exception ex)
{
StatusMessage = $"Erreur: {ex.Message}";
}
finally
{
IsBusy = false;
}
}
[RelayCommand]
internal async Task OpenAddMemberAsync()
{
var app = Application.Current as App;
var services = app?.ServiceProvider;
var directory = services.GetRequiredService<IUserDirectory>();
AddCircleMemberDialogViewModel model =
new AddCircleMemberDialogViewModel(directory);
// Wire the dialog's Confirmed event to OnAddMemberConfirmedAsync.
// Without this, the dialog's "Ajouter" button fires the event
// into the void: no subscriber, the picked user is silently
// dropped, and nothing is added to the circle. The dialog
// stays open until the user uses the back gesture — which is
// how the user noticed the button was a no-op.
// Async-void is intentional here: Confirmed is an
// EventHandler<T> (returns void), and bridging to the
// async Task OnAddMemberConfirmedAsync requires it.
model.Confirmed += async (_, picked) =>
await OnAddMemberConfirmedAsync(_, picked);
await app.PushPageAsync(model);
}
/// <summary>
/// Load the members of one of the caller's circles. The
/// server scopes the endpoint with a 404 when the circle
/// doesn't belong to the caller (mirroring the rest of the
/// circle API); that case flattens to an empty list here.
/// </summary>
[RelayCommand]
public async Task LoadMembersAsync(long circleId)
{
IsBusy = true;
try
{
var list = await _client.GetMembersAsync(circleId);
Members = new ObservableCollection<CircleMemberDto>(list ?? new());
StatusMessage = $"{Members.Count} membre(s)";
}
catch (Exception ex)
{
StatusMessage = $"Erreur: {ex.Message}";
Members = new ObservableCollection<CircleMemberDto>();
}
finally
{
IsBusy = false;
}
}
[RelayCommand]
public void StartCreate()
{
SelectedCircle = null;
DraftName = string.Empty;
DraftPublic = false;
StatusMessage = "Nouveau cercle";
}
[RelayCommand]
public void StartEdit(CircleDto? circle)
{
if (circle is null) return;
SelectedCircle = circle;
DraftName = circle.Name;
DraftPublic = circle.Public;
StatusMessage = $"Édition de « {circle.Name} »";
}
[RelayCommand]
public async Task SaveAsync()
{
if (string.IsNullOrWhiteSpace(DraftName))
{
StatusMessage = "Le nom est obligatoire";
return;
}
IsBusy = true;
try
{
if (SelectedCircle is null)
{
var created = await _client.CreateCircleAsync(new CircleDto
{
Name = DraftName.Trim(),
Public = DraftPublic,
});
StatusMessage = created is null
? "Création échouée"
: $"Cercle « {created.Name} » créé";
}
else
{
SelectedCircle.Name = DraftName.Trim();
SelectedCircle.Public = DraftPublic;
await _client.UpdateCircleAsync(SelectedCircle.Id, SelectedCircle);
StatusMessage = $"Cercle « {SelectedCircle.Name} » mis à jour";
}
await RefreshAsync();
}
catch (Exception ex)
{
StatusMessage = $"Erreur: {ex.Message}";
}
finally
{
IsBusy = false;
}
}
[RelayCommand]
public async Task DeleteAsync(CircleDto? circle)
{
if (circle is null) return;
IsBusy = true;
try
{
await _client.DeleteCircleAsync(circle.Id);
StatusMessage = $"Cercle « {circle.Name} » supprimé";
// If the deleted circle was the selected one,
// clear the selection so the Members view goes
// empty too (the partial setter on
// SelectedCircle will reset Members).
if (SelectedCircle?.Id == circle.Id)
SelectedCircle = null;
await RefreshAsync();
}
catch (Exception ex)
{
StatusMessage = $"Erreur: {ex.Message}";
}
finally
{
IsBusy = false;
}
}
/// <summary>
/// Called by the view when the dialog confirms a
/// selection. Adds the picked user to the currently
/// selected circle and refreshes the members list.
/// </summary>
public async Task OnAddMemberConfirmedAsync(object? sender, UserSummary picked)
{
if (SelectedCircle is null || picked is null) return;
IsBusy = true;
try
{
await _client.AddMemberAsync(SelectedCircle.Id, picked.Id);
StatusMessage = $"« {picked.DisplayName} » ajouté au cercle";
await LoadMembersAsync(SelectedCircle.Id);
}
catch (Exception ex)
{
// 409 (already a member) is a likely race — surface
// it as a friendly status, not an error. The
// server returns 409 for "already a member";
// YavscApiClient surfaces that as an exception
// today; future refactors could route 409 into a
// typed result, but for now the message string is
// distinctive enough.
var msg = ex.Message.Contains("409") || ex.Message.Contains("Conflict")
? "Déjà membre du cercle"
: $"Erreur: {ex.Message}";
StatusMessage = msg;
}
finally
{
IsBusy = false;
}
}
/// <summary>
/// Per-row "remove" command. Updates the local
/// collection in place so the UI doesn't flash.
/// </summary>
[RelayCommand]
public async Task RemoveMemberAsync(CircleMemberDto? member)
{
if (member is null || SelectedCircle is null) return;
IsBusy = true;
try
{
await _client.RemoveMemberAsync(SelectedCircle.Id, member.Id);
Members.Remove(member);
StatusMessage = $"« {member.UserName} » retiré du cercle";
}
catch (Exception ex)
{
StatusMessage = $"Erreur: {ex.Message}";
}
finally
{
IsBusy = false;
}
}
}