@using LANCommander.SDK.Extensions
@namespace LANCommander.Launcher.UI.Components
@inject LibraryService LibraryService
@inject NavigationManager NavigationManager
@inject LocalizationService LocalizationService

<Flex Direction="FlexDirection.Vertical" Class="library-list">
    @if (LibraryService.Items == null || !LibraryService.Items.Any())
    {
        <Empty Simple Description="false">
            <Button Type="ButtonType.Primary" OnClick="@(() => NavigationManager.NavigateTo("/Depot"))">@LocalizationService.GetString("BrowseDepot")</Button>
        </Empty>
    }
    else
    {
        if (LibraryItems == null || !LibraryItems.Any())
        {
            <Empty Simple Description="@LocalizationService.GetString("NoResultsFound")">
                <Button Type="ButtonType.Primary" OnClick="Filter.ResetFilter">@LocalizationService.GetString("ResetFilter")</Button>
            </Empty>
        }
        else
        {
            <Collapse>
                @if (Groups.Count > 1)
                {
                    foreach (var group in Groups.OrderByTitle(g => g))
                    {
                        <Panel Header="@group" Key="@group">
                            <AntList DataSource="@(LibraryItems.Where(i => i.Groups.Contains(group) || (group == "Uncategorized" && !i.Groups.Any())))" TItem="Models.ListItem" Class="ant-list-clickable" Size="ListSize.Small">
                                <LibraryListItem Model="@context" OnClick="() => SelectItem(context)" SelectedItem="_currentItemId"/>
                            </AntList>
                        </Panel>
                    }
                }
                else
                {
                    <Panel Class="no-header">
                        <AntList DataSource="LibraryItems" TItem="Models.ListItem" Class="ant-list-clickable" Size="ListSize.Small">
                            <LibraryListItem Model="@context" OnClick="() => SelectItem(context)" SelectedItem="_currentItemId" />
                        </AntList>
                    </Panel>
                }
            </Collapse>
        }

        <LibraryItemFilter @ref="Filter" />
    }
</Flex>

@code {
    [Parameter] public EventCallback<Guid> OnItemSelected { get; set; }

    List<string> Groups = new();
    IEnumerable<Models.ListItem> LibraryItems = [];
    LibraryItemFilter? Filter;
    
    Guid _currentItemId { get; set; }

    protected override async Task OnInitializedAsync()
    {
        LibraryService.OnItemsFiltered += LoadFilteredItems;

        await LibraryService.RefreshItemsAsync();
    }

    async Task LoadFilteredItems(IEnumerable<Models.ListItem> libraryItems)
    {
        LibraryItems = libraryItems;

        await UpdateGroups();
        await InvokeAsync(StateHasChanged);
    }

    async Task SelectItem(Models.ListItem item)
    {
        _currentItemId = item.Key;
        
        if (OnItemSelected.HasDelegate)
            await OnItemSelected.InvokeAsync(item.Key);
    }

    async Task UpdateGroups()
    {
        Groups = LibraryItems.SelectMany(i => i.Groups).Distinct().ToList();

        if (LibraryItems.Any(i => i.Groups == null || i.Groups.Length == 0))
            Groups.Add(LocalizationService.GetString("Uncategorized"));

        await InvokeAsync(StateHasChanged);
    }

    public void Dispose()
    {
        LibraryService.OnItemsFiltered -= LoadFilteredItems;
    }
}