@page "/media/multi-collections/{Id:int}/edit"
@page "/media/multi-collections/add"
@using ErsatzTV.Application.MediaCollections
@using ErsatzTV.Application.MediaCollections.Commands
@using ErsatzTV.Application.MediaCollections.Queries
@inject IMediator _mediator
@inject NavigationManager _navigationManager
@inject ISnackbar _snackbar
@inject ILogger<MultiCollectionEditor> _logger

<MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
    <div style="max-width: 400px;">
        <MudText Typo="Typo.h4" Class="mb-4">@(IsEdit ? "Edit Multi Collection" : "Add Multi Collection")</MudText>

        <EditForm EditContext="_editContext" OnSubmit="@HandleSubmitAsync">
            <FluentValidator/>
            <MudCard>
                <MudCardContent>
                    <MudTextField Class="mt-3" Label="Name" @bind-Value="_model.Name" For="@(() => _model.Name)"/>
                    <MudAutocomplete @ref="_collectionAutocomplete"
                                     Class="mt-4"
                                     T="MediaCollectionViewModel"
                                     Label="Collection"
                                     @bind-value="_selectedCollection"
                                     SearchFunc="@SearchCollections"
                                     ToStringFunc="@(c => c?.Name)"/>
                    <MudButton Variant="Variant.Filled" Color="Color.Secondary" OnClick="@(_ => AddCollection())" Class="mt-4 mr-auto">
                        Add Collection
                    </MudButton>
                    <MudAutocomplete @ref="_smartCollectionAutocomplete"
                                     Class="mt-4"
                                     T="SmartCollectionViewModel"
                                     Label="Smart Collection"
                                     @bind-value="_selectedSmartCollection"
                                     SearchFunc="@SearchSmartCollections"
                                     ToStringFunc="@(c => c?.Name)"/>
                    <MudButton Variant="Variant.Filled" Color="Color.Secondary" OnClick="@(_ => AddSmartCollection())" Class="mt-4 mr-auto">
                        Add Smart Collection
                    </MudButton>
                </MudCardContent>
                <MudCardActions>
                    <MudButton ButtonType="ButtonType.Submit" Variant="Variant.Filled" Color="Color.Primary" Class="mr-2 ml-auto">
                        @(IsEdit ? "Save Changes" : "Add Multi Collection")
                    </MudButton>
                </MudCardActions>
            </MudCard>
        </EditForm>
    </div>

    <MudTable Hover="true" Items="_model.Items.OrderBy(i => i.Collection.Name, StringComparer.CurrentCultureIgnoreCase)" Dense="true" Class="mt-6">
        <ToolBarContent>
            <MudText Typo="Typo.h6">@_model.Name Items</MudText>
        </ToolBarContent>
        <ColGroup>
            <col/>
            <col style="width: 20%"/>
            <col style="width: 30%"/>
            <col style="width: 60px;"/>
        </ColGroup>
        <HeaderContent>
            <MudTh>Collection</MudTh>
            <MudTh>Schedule As Group</MudTh>
            <MudTh>Playback Order</MudTh>
            <MudTh/>
        </HeaderContent>
        <RowTemplate>
            <MudTd DataLabel="Collection">
                <MudText Typo="Typo.body2">
                    @context.Collection.Name
                </MudText>
            </MudTd>
            <MudTd DataLabel="Schedule As Group">
                <MudCheckBox @bind-Checked="@context.ScheduleAsGroup" For="@(() => context.ScheduleAsGroup)"/>
            </MudTd>
            <MudTd DataLabel="Playback Order">
                @if (context.ScheduleAsGroup)
                {
                    <MudText Typo="Typo.body2">
                        @(context.Collection.UseCustomPlaybackOrder ? "Custom" : "Chronological")
                    </MudText>
                }
            </MudTd>
            <MudTd>
                <MudIconButton Icon="@Icons.Material.Filled.Delete"
                               OnClick="@(_ => RemoveCollection(context))">
                </MudIconButton>
            </MudTd>
        </RowTemplate>
    </MudTable>
</MudContainer>

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

    private readonly MultiCollectionEditViewModel _model = new();
    private EditContext _editContext;
    private ValidationMessageStore _messageStore;
    private List<MediaCollectionViewModel> _collections;
    private List<SmartCollectionViewModel> _smartCollections;
    private MediaCollectionViewModel _selectedCollection;
    private SmartCollectionViewModel _selectedSmartCollection;
    private MudAutocomplete<MediaCollectionViewModel> _collectionAutocomplete;
    private MudAutocomplete<SmartCollectionViewModel> _smartCollectionAutocomplete;
    
    protected override async Task OnParametersSetAsync()
    {
        _collections = await _mediator.Send(new GetAllCollections())
            .Map(list => list.OrderBy(vm => vm.Name, StringComparer.CurrentCultureIgnoreCase).ToList());

        _smartCollections = await _mediator.Send(new GetAllSmartCollections())
            .Map(list => list.OrderBy(vm => vm.Name, StringComparer.CurrentCultureIgnoreCase).ToList());

        if (IsEdit)
        {
            Option<MultiCollectionViewModel> maybeCollection = await _mediator.Send(new GetMultiCollectionById(Id));
            maybeCollection.IfSome(collection =>
            {
                _model.Id = collection.Id;
                _model.Name = collection.Name;
                _model.Items = collection.Items
                    .Map(item =>
                        new MultiCollectionItemEditViewModel
                        {
                            Collection = item.Collection,
                            ScheduleAsGroup = item.ScheduleAsGroup,
                            PlaybackOrder = item.PlaybackOrder,
                        })
                    .Append(collection.SmartItems.Map(item =>
                        new MultiCollectionSmartItemEditViewModel
                        {
                            SmartCollection = item.SmartCollection,
                            ScheduleAsGroup = item.ScheduleAsGroup,
                            PlaybackOrder = item.PlaybackOrder
                        })).ToList();
            });
        }
        else
        {
            _model.Name = "New Multi Collection";
            _model.Items = new List<MultiCollectionItemEditViewModel>();
        }
    }

    protected override void OnInitialized()
    {
        _editContext = new EditContext(_model);
        _messageStore = new ValidationMessageStore(_editContext);
    }

    private bool IsEdit => Id != 0;

    private async Task HandleSubmitAsync()
    {
        _messageStore.Clear();
        if (_editContext.Validate())
        {
            Seq<BaseError> errorMessage = IsEdit ?
                (await _mediator.Send(new UpdateMultiCollection(Id, _model.Name, GetUpdateItems()))).LeftToSeq() :
                (await _mediator.Send(new CreateMultiCollection(_model.Name, GetCreateItems()))).LeftToSeq();

            errorMessage.HeadOrNone().Match(
                error =>
                {
                    _snackbar.Add(error.Value, Severity.Error);
                    _logger.LogError("Error saving collection: {Error}", error.Value);
                },
                () => _navigationManager.NavigateTo("/media/collections"));
        }
    }

    private List<UpdateMultiCollectionItem> GetUpdateItems() => 
        _model.Items.Map(i =>
            i switch
            {
                MultiCollectionSmartItemEditViewModel smartVm =>
                    new UpdateMultiCollectionItem(
                        null,
                        smartVm.SmartCollection.Id,
                        smartVm.ScheduleAsGroup,
                        smartVm.PlaybackOrder),
                _ => new UpdateMultiCollectionItem(i.Collection.Id, null, i.ScheduleAsGroup, i.PlaybackOrder)
            }).ToList();
    
    private List<CreateMultiCollectionItem> GetCreateItems() => 
        _model.Items.Map(i =>
            i switch
            {
                MultiCollectionSmartItemEditViewModel smartVm =>
                    new CreateMultiCollectionItem(
                        null,
                        smartVm.SmartCollection.Id,
                        smartVm.ScheduleAsGroup,
                        smartVm.PlaybackOrder),
                _ => new CreateMultiCollectionItem(i.Collection.Id, null, i.ScheduleAsGroup, i.PlaybackOrder)
            }).ToList();

    private void RemoveCollection(MultiCollectionItemEditViewModel item)
    {
        _model.Items.Remove(item);
    }

    private void AddCollection()
    {
        if (_selectedCollection != null && _model.Items.All(i => i.Collection != _selectedCollection))
        {
            _model.Items.Add(new MultiCollectionItemEditViewModel
            {
                Collection = _selectedCollection,
                PlaybackOrder = PlaybackOrder.Chronological
            });

            _selectedCollection = null;
            _collectionAutocomplete.Reset();
        }
    }

    private void AddSmartCollection()
    {
        if (_selectedSmartCollection != null && _model.Items.OfType<MultiCollectionSmartItemEditViewModel>().All(i => i.SmartCollection != _selectedSmartCollection))
        {
            _model.Items.Add(new MultiCollectionSmartItemEditViewModel
            {
                SmartCollection = _selectedSmartCollection,
                PlaybackOrder = PlaybackOrder.Chronological
            });

            _selectedSmartCollection = null;
            _smartCollectionAutocomplete.Reset();
        }
    }

    private Task<IEnumerable<MediaCollectionViewModel>> SearchCollections(string value) =>
        _collections.Filter(c => _model.Items.All(i => i.Collection != c) && c.Name.Contains(value ?? string.Empty, StringComparison.OrdinalIgnoreCase)).AsTask();

    private Task<IEnumerable<SmartCollectionViewModel>> SearchSmartCollections(string value) =>
        _smartCollections.Filter(c => _model.Items.OfType<MultiCollectionSmartItemEditViewModel>().All(i => i.SmartCollection != c) && c.Name.Contains(value ?? string.Empty, StringComparison.OrdinalIgnoreCase)).AsTask();

}