@page "/media/collections/{Id:int}/edit"
@page "/media/collections/add"
@using ErsatzTV.Application.MediaCollections
@implements IDisposable
@inject NavigationManager NavigationManager
@inject ILogger<CollectionEditor> Logger
@inject ISnackbar Snackbar
@inject IMediator Mediator

<MudForm @ref="_form" @bind-IsValid="@_success" Style="max-height: 100%">
    <MudPaper Square="true" Style="display: flex; height: 64px; min-height: 64px; width: 100%; z-index: 100; align-items: center">
        <MudButton Variant="Variant.Filled" Color="Color.Primary" Class="ml-6" OnClick="@HandleSubmitAsync" StartIcon="@(IsEdit ? Icons.Material.Filled.Save : Icons.Material.Filled.Add)">@(IsEdit ? "Save Collection" : "Add Collection")</MudButton>
    </MudPaper>
    <div class="d-flex flex-column" style="height: 100vh; overflow-x: auto">
        <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
            <MudText Typo="Typo.h5" Class="mb-2">Collection</MudText>
            <MudDivider Class="mb-6"/>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Name</MudText>
                </div>
                <MudTextField @bind-Value="_model.Name" For="@(() => _model.Name)" Required="true" RequiredError="Collection name is required!"/>
            </MudStack>
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

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

    private readonly CollectionEditViewModel _model = new();
    private MudForm _form;
    private bool _success;

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

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

        try
        {
            if (IsEdit)
            {
                Option<MediaCollectionViewModel> maybeCollection = await Mediator.Send(new GetCollectionById(Id), token);
                maybeCollection.IfSome(collection =>
                {
                    _model.Id = collection.Id;
                    _model.Name = collection.Name;
                });
            }
            else
            {
                _model.Name = "New Collection";
            }
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private bool IsEdit => Id != 0;

    private async Task HandleSubmitAsync()
    {
        await _form.Validate();
        if (_success)
        {
            Seq<BaseError> errorMessage = IsEdit ? (await Mediator.Send(new UpdateCollection(Id, _model.Name), _cts.Token)).LeftToSeq() : (await Mediator.Send(new CreateCollection(_model.Name), _cts.Token)).LeftToSeq();

            errorMessage.HeadOrNone().Match(
                error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Error saving collection: {Error}", error.Value);
                },
                () => NavigationManager.NavigateTo(_model.Id > 0 ? $"media/collections/{_model.Id}" : "media/collections"));
        }
    }

}