@using LANCommander.Client.Models
@inject LibraryService LibraryService
@inject ImportService ImportService
@inject MessageBusService MessageBusService

<div class="library-list">
    <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="LibraryItem" Class="ant-list-clickable" Size="small">
                        <ListItem OnClick='() => SelectItem(context)' Class="@GetItemClasses(context)">
                            <div class="library-list-icon">
                                <MediaImage Id="@context.IconId" />
                            </div>
                            <span>@context.Name</span>
                        </ListItem>
                    </AntList>
                </Panel>
            }
        }
        else
        {
            <Panel Class="no-header">
                <AntList DataSource="LibraryService.LibraryItems" TItem="LibraryItem" Class="ant-list-clickable" Size="small">
                    <ListItem OnClick='() => SelectItem(context)' Class="@GetItemClasses(context)">
                        <div class="library-list-icon">
                            <MediaImage Id="@context.IconId" />
                        </div>
                        <span>@context.Name</span>
                    </ListItem>
                </AntList>
            </Panel>
        }
    </Collapse>
</div>

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

    List<string> Groups = new List<string>();
    IEnumerable<LibraryItem> LibraryItems;

    protected override void OnInitialized()
    {
        LibraryService.OnLibraryChanged += () => {
            UpdateGroups();
        };

        ImportService.OnImportComplete += () =>
        {
            UpdateGroups();
        };

        MessageBusService.OnLibraryFilterApplied += UpdateGroups;

        UpdateGroups();
    }

    string GetItemClasses(LibraryItem item)
    {
        HashSet<string> classes = new HashSet<string>();

        if (item.State == LibraryItemState.Installed)
            classes.Add("installed");

        if (SelectedItem == item.Key)
            classes.Add("selected");

        return String.Join(" ", classes);
    }

    async Task SelectItem(LibraryItem item)
    {
        if (OnItemSelected.HasDelegate)
            await OnItemSelected.InvokeAsync(item.Key);
    }

    async Task UpdateGroups()
    {
        LibraryItems = await LibraryService.GetLibraryItemsAsync();

        Groups = LibraryItems.SelectMany(i => i.Groups).Distinct().ToList();

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

        InvokeAsync(StateHasChanged);
    }
}