@*
    T33b: body component for the "Move folder" dialog hosted by
    IDialogService.ShowAsync. Renders ONLY the picker + action buttons inside the
    host's .modal-body; the host owns the backdrop, header, and focus trap. The
    body closes with a MoveFolderResult carrying the picked parent id (null = Root,
    which is why a result record is used: Close(null) would otherwise be
    indistinguishable from a Cancel). The parent validates after the dialog closes
    and toasts any server guard failure.
*@
<select class="form-select form-select-sm" @bind="_targetParentId">
    @foreach (var opt in FolderOptions)
    {
        <option value="@opt.Id">@opt.Label</option>
    }
</select>

<div class="modal-footer px-0 pb-0 mt-3">
    <div class="btn-group btn-group-sm" role="group">
        <button class="btn btn-outline-secondary" @onclick="() => Context.Cancel()">Cancel</button>
        <button class="btn btn-primary" @onclick="Submit">Move</button>
    </div>
</div>

@code {
    /// <summary>Host-supplied context used to close (with the picked parent id) or cancel.</summary>
    [Parameter] public DialogContext<MoveFolderResult> Context { get; set; } = default!;
    [Parameter] public IEnumerable<(int? Id, string Label)> FolderOptions { get; set; } = Array.Empty<(int?, string)>();

    private int? _targetParentId;

    private void Submit() => Context.Close(new MoveFolderResult(_targetParentId));

    /// <summary>
    /// Result of the move-folder picker. A reference type so a non-null close is
    /// distinguishable from a cancel even when the picked parent is null (Root):
    /// ShowAsync resolves to this record on Move and to <c>null</c> on Cancel.
    /// </summary>
    /// <param name="NewParentId">The chosen parent folder id, or <c>null</c> for Root.</param>
    public sealed record MoveFolderResult(int? NewParentId);
}