@using Groceries.Data
@using Microsoft.EntityFrameworkCore

@layout Layout
@inject AppDbContext DbContext

<PageTitle>Groceries &ndash; Items</PageTitle>

<header class="row">
    <h1 class="row__fill">Items</h1>
    <search title="Items">
        <SearchForm data-turbo-frame="table" data-turbo-action="advance">
            <input type="hidden" name="page" value="1" />
        </SearchForm>
    </search>
</header>

<turbo-frame id="table" target="top">
    <section class="table">
        <Table Items="items" Pagination="pagination" HeaderClass="table__header--shaded">
            <PropertyTableColumn Property="i => i.Brand" Sortable="true" />
            <PropertyTableColumn Property="i => i.Name" Fill="true" Sortable="true" />
            <PropertyTableColumn Property="i => i.LastPurchasedAt" Title="Last Purchased" Sortable="true">
                <time datetime="@context?.ToString("o")">@context?.ToLongDateString()</time>
            </PropertyTableColumn>
            <PropertyTableColumn Property="i => i.HasBarcode" Title="Barcode" Align="Align.Center" Sortable="true">
                <span class="icon icon--sm">@(context ? "✓" : "")</span>
            </PropertyTableColumn>
            @* <TemplateTableColumn>
                <a class="link" href="/items/edit/@context.Id">Edit</a>
            </TemplateTableColumn> *@
        </Table>
        <TablePaginator State="pagination" />
    </section>
</turbo-frame>

@code {
    private record ItemModel
    {
        public Guid Id { get; init; }
        public required string Brand { get; init; }
        public required string Name { get; init; }
        public bool HasBarcode { get; init; }
        public DateTime? LastPurchasedAt { get; init; }
    }

    private IQueryable<ItemModel> items = null!;
    private PaginationState pagination = new();

    [SupplyParameterFromQuery]
    public string? Search { get; set; }

    protected override void OnParametersSet()
    {
        var itemsQuery = DbContext.Items.AsQueryable();
        if (!string.IsNullOrEmpty(Search))
        {
            var searchPattern = $"%{Search}%";
            itemsQuery = itemsQuery.Where(item => EF.Functions.ILike(item.Brand + ' ' + item.Name, searchPattern));
        }

        items = itemsQuery
            .GroupJoin(
                DbContext.ItemPurchases.Where(purchase => purchase.IsLastPurchase),
                item => item.Id,
                purchase => purchase.ItemId,
                (item, purchases) => new { item, purchases })
            .SelectMany(
                group => group.purchases.DefaultIfEmpty(),
                (group, lastPurchase) => new ItemModel
                {
                    Id = group.item.Id,
                    Brand = group.item.Brand,
                    Name = group.item.Name,
                    HasBarcode = group.item.Barcodes.Count != 0,
                    LastPurchasedAt = lastPurchase != null ? lastPurchase.CreatedAt : null,
                })
            .OrderBy(item => item.Brand)
            .ThenBy(item => item.Name);
    }
}