@page "/"
@using CodeHollow.FeedReader;
@using SharpRss.Models;
@using WebSharpRSS.Models;
@using SharpRss.Services

@*@inject RssService _rssService;*@
@inject FeedStateContainer _stateContainer;

<MudGrid Spacing="3" Justify="Justify.FlexStart">
    @foreach (var feedItem in _items)
    {
        <MudItem xs="6">
            <MudCard>
                <MudCardContent>
                    <MudText>@feedItem.Title</MudText>
                    <MudText Typo="Typo.body2">@feedItem.Description</MudText>
                    <MudText Typo="Typo.overline">@feedItem.PublishingDate.ToString()</MudText>
                </MudCardContent>
            </MudCard>
        </MudItem>
    }
</MudGrid>

@code {

    private HashSet<FeedItem> _items = new HashSet<FeedItem>();
    protected override void OnInitialized()
    {
        UpdateFeeds();
        _stateContainer.StateChanged += FeedsChanged;
    }
    private void FeedsChanged()
    {
        UpdateFeeds();
        InvokeAsync(StateHasChanged);
    }

    private void UpdateFeeds()
    {
        if (_stateContainer.TreeItem == null) return;
        if (_stateContainer.TreeItem.Feed != null)
            _items = _stateContainer.TreeItem.Feed.Items.ToHashSet();
        if (_stateContainer.TreeItem.Feeds != null)
        {
            _items = new HashSet<FeedItem>();
            foreach (var itemData in _stateContainer.TreeItem.Feeds)
            {
                if (itemData.Feed == null) continue;
                _items.UnionWith(itemData.Feed.Items);
            }
        }
    }
}