ErsatzTV/ErsatzTV/Pages/LocalLibraryEditor.razor

@page "/media/sources/local/{Id:int}/edit"
@page "/media/sources/local/add"
@using ErsatzTV.Application.Libraries
@implements IDisposable
@inject IDialogService Dialog
@inject IEntityLocker Locker
@inject IMediator Mediator
@inject ILogger<LocalLibraryEditor> Logger
@inject ISnackbar Snackbar
@inject NavigationManager NavigationManager

<MudForm Model="@_model" @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="SaveChangesAsync" StartIcon="@(IsEdit ? Icons.Material.Filled.Save : Icons.Material.Filled.Add)">@(IsEdit ? "Save Local Library" : "Add Local Library")</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">Local Library</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="Local library name is required!"/>
            </MudStack>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Media Kind</MudText>
                </div>
                <MudSelect Disabled="IsEdit" @bind-Value="_model.MediaKind" For="@(() => _model.MediaKind)">
                    @foreach (LibraryMediaKind mediaKind in Enum.GetValues<LibraryMediaKind>())
                    {
                        <MudSelectItem Value="@mediaKind">@mediaKind</MudSelectItem>
                    }
                </MudSelect>
            </MudStack>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Path</MudText>
                </div>
                <MudTextField @bind-Value="_newPath.Path" For="@(() => _newPath.Path)"/>
            </MudStack>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex"></div>
                <MudButton Variant="Variant.Filled" Color="Color.Secondary" OnClick="@(_ => AddLibraryPath())" StartIcon="@Icons.Material.Filled.Add">
                    Add Path
                </MudButton>
            </MudStack>
            <MudTable Hover="true" Items="_model.Paths" Class="mt-6">
                <ToolBarContent>
                    <MudText Typo="Typo.h6">Library Paths</MudText>
                </ToolBarContent>
                <ColGroup>
                    <MudHidden Breakpoint="Breakpoint.Xs">
                        <col/>
                        <col style="width: 120px;"/>
                    </MudHidden>
                </ColGroup>
                <HeaderContent>
                    <MudTh>Path</MudTh>
                    <MudTh/>
                </HeaderContent>
                <RowTemplate>
                    <MudTd>@context.Path</MudTd>
                    <MudTd>
                        <div style="align-items: center; display: flex;">
                            <MudTooltip Text="Move Library Path">
                                <MudIconButton Icon="@Icons.Material.Filled.DriveFileMove"
                                               Disabled="@(_model.Id == 0 || context.Id == 0 || Locker.IsLibraryLocked(_model.Id))"
                                               OnClick="@(() => MoveLibraryPath(context))">
                                </MudIconButton>
                            </MudTooltip>
                            <MudTooltip Text="Delete Library Path">
                                <MudIconButton Icon="@Icons.Material.Filled.Delete"
                                               OnClick="@(() => DeleteLibraryPath(context))">
                                </MudIconButton>
                            </MudTooltip>
                        </div>
                    </MudTd>
                </RowTemplate>
            </MudTable>
        </MudContainer>
    </div>
</MudForm>

@code {
    private readonly CancellationTokenSource _cts = new();

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

    private readonly LocalLibraryEditViewModel _model = new();
    private readonly LocalLibraryPathEditViewModel _newPath = new();
    private bool _success;

    private bool IsEdit => Id != 0;

    protected override async Task OnParametersSetAsync()
    {
        if (IsEdit)
        {
            Option<LocalLibraryViewModel> maybeLibrary = await Mediator.Send(new GetLocalLibraryById(Id), _cts.Token);
            await maybeLibrary.Match(
                async library =>
                {
                    _model.Id = library.Id;
                    _model.Name = library.Name;
                    _model.MediaKind = library.MediaKind;

                    await LoadLibraryPaths();
                },
                () =>
                {
                    NavigationManager.NavigateTo("404");
                    return Task.CompletedTask;
                });
        }
        else
        {
            _model.HasChanges = true;
            _model.Name = "New Local Library";
            _model.MediaKind = LibraryMediaKind.Movies;
            _model.Paths = new List<LocalLibraryPathEditViewModel>();
        }
    }

    protected override void OnInitialized()
    {
        Locker.OnLibraryChanged += LockChanged;
    }

    private void LockChanged(object sender, EventArgs e) =>
        InvokeAsync(StateHasChanged);

    private async Task LoadLibraryPaths()
    {
        _model.HasChanges = false;
        _model.Paths = await Mediator.Send(new GetLocalLibraryPaths(Id), _cts.Token)
            .Map(list => list.Map(vm => new LocalLibraryPathEditViewModel
            {
                Id = vm.Id,
                Path = vm.Path
            }).ToList());
    }

    private async Task MoveLibraryPath(LocalLibraryPathEditViewModel libraryPath)
    {
        var parameters = new DialogParameters { { "MediaKind", _model.MediaKind }, { "SourceLibraryId", Id } };
        var options = new DialogOptions { CloseButton = true, MaxWidth = MaxWidth.ExtraSmall };

        IDialogReference dialog = await Dialog.ShowAsync<MoveLocalLibraryPathDialog>("Move Local Library Path", parameters, options);
        DialogResult result = await dialog.Result;
        if (result is { Canceled: false, Data: LocalLibraryViewModel library })
        {
            var request = new MoveLocalLibraryPath(libraryPath.Id, library.Id);
            Either<BaseError, Unit> moveResult = await Mediator.Send(request, _cts.Token);
            moveResult.Match(
                _ => NavigationManager.NavigateTo($"media/sources/local/{library.Id}/edit"),
                error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Unexpected error moving local library path: {Error}", error.Value);
                });
        }
    }

    private async Task DeleteLibraryPath(LocalLibraryPathEditViewModel libraryPath)
    {
        if (libraryPath.Id == 0)
        {
            _model.HasChanges = true;
            _model.Paths.Remove(libraryPath);
        }

        int count = await Mediator.Send(new CountMediaItemsByLibraryPath(libraryPath.Id), _cts.Token);
        var parameters = new DialogParameters
        {
            { "EntityType", "library path" },
            { "EntityName", libraryPath.Path },
            { "DetailText", $"This library path contains {count} media items." },
            { "DetailHighlight", count.ToString() }
        };
        var options = new DialogOptions { CloseButton = true, MaxWidth = MaxWidth.ExtraSmall };

        IDialogReference dialog = await Dialog.ShowAsync<DeleteDialog>("Delete Library Path", parameters, options);
        DialogResult result = await dialog.Result;
        if (result is { Canceled: false })
        {
            _model.HasChanges = true;
            _model.Paths.Remove(libraryPath);
        }
    }

    private void AddLibraryPath()
    {
        if (string.IsNullOrWhiteSpace(_newPath.Path))
        {
            return;
        }

        if (!Directory.Exists(_newPath.Path))
        {
            Snackbar.Add("Path must exist on filesystem", Severity.Error);
            return;
        }

        if (!string.IsNullOrWhiteSpace(_newPath.Path) && _model.Paths.All(p => NormalizePath(p.Path) != NormalizePath(_newPath.Path)))
        {
            _model.HasChanges = true;
            _model.Paths.Add(
                new LocalLibraryPathEditViewModel
                {
                    Path = _newPath.Path
                });
        }

        _newPath.Path = null;
    }

    private async Task SaveChangesAsync()
    {
        if (_success)
        {
            Either<BaseError, LocalLibraryViewModel> result = IsEdit
                ? await Mediator.Send(
                    new UpdateLocalLibrary(
                        _model.Id,
                        _model.Name,
                        _model.Paths.Map(p => new UpdateLocalLibraryPath(p.Id, p.Path)).ToList()),
                    _cts.Token)
                : await Mediator.Send(
                    new CreateLocalLibrary(
                        _model.Name,
                        _model.MediaKind,
                        _model.Paths.Map(p => p.Path).ToList()),
                    _cts.Token);

            result.Match(
                _ => NavigationManager.NavigateTo("media/sources/local"),
                error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Unexpected error saving local library: {Error}", error.Value);
                });
        }
    }

    private string NormalizePath(string path) => Path.GetFullPath(new Uri(path).LocalPath)
        .TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar)
        .ToUpperInvariant();

    void IDisposable.Dispose()
    {
        Locker.OnLibraryChanged -= LockChanged;

        _cts.Cancel();
        _cts.Dispose();
    }

}