@using ErsatzTV.Application.Scheduling
@implements IDisposable
@inject IMediator Mediator
@inject ISnackbar Snackbar
@inject ILogger<CopyScheduleDialog> Logger

<MudDialog>
    <DialogContent>
        <EditForm Model="@_dummyModel" OnSubmit="@(_ => Submit())">
            <div class="d-flex mb-6">
                <MudText>Select a group for the new block</MudText>
            </div>
            <MudSelect @bind-Value="_selectedBlockGroup" Class="mb-6 mx-4" Label="New Block Group">
                @foreach (BlockGroupViewModel blockGroup in _blockGroups)
                {
                    <MudSelectItem Value="@blockGroup">@blockGroup.Name</MudSelectItem>
                }
            </MudSelect>
            <div class="d-flex mb-6">
                <MudText>Enter a name for the new block</MudText>
            </div>
            <MudTextField T="string" Label="New Block Name"
                          @bind-Text="@_newName"
                          Class="mb-6 mx-4">
            </MudTextField>
        </EditForm>
    </DialogContent>
    <DialogActions>
        <MudButton OnClick="@Cancel" ButtonType="ButtonType.Reset">Cancel</MudButton>
        <MudButton Color="Color.Primary" Variant="Variant.Filled" OnClick="@Submit">
            Copy Block
        </MudButton>
    </DialogActions>
</MudDialog>

@code {
    private CancellationTokenSource _cts;

    [CascadingParameter]
    IMudDialogInstance MudDialog { get; set; }

    [Parameter]
    public int BlockId { get; set; }

    private record DummyModel;

    private readonly DummyModel _dummyModel = new();

    private List<BlockGroupViewModel> _blockGroups = [];
    private BlockGroupViewModel _selectedBlockGroup;

    private string _newName;

    public void Dispose()
    {
        _cts?.Cancel();
        _cts?.Dispose();
    }

    protected override async Task OnParametersSetAsync()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();
        var token = _cts.Token;

        try
        {
            _blockGroups = await Mediator.Send(new GetAllBlockGroups(), token);
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private bool CanSubmit() => _selectedBlockGroup != null && !string.IsNullOrWhiteSpace(_newName);

    private async Task Submit()
    {
        if (!CanSubmit())
        {
            return;
        }

        Either<BaseError, BlockViewModel> maybeResult =
            await Mediator.Send(new CopyBlock(BlockId, _selectedBlockGroup.Id, _newName), _cts.Token);

        maybeResult.Match(
            schedule => { MudDialog.Close(DialogResult.Ok(schedule)); },
            error =>
            {
                Snackbar.Add(error.Value, Severity.Error);
                Logger.LogError("Error copying block: {Error}", error.Value);
                MudDialog.Close(DialogResult.Cancel());
            });
    }

    private void Cancel(MouseEventArgs e) => MudDialog.Cancel();
}