@page "/tables/multi-header"

<h3>表头分组功能</h3>

<h4>数据结构比较复杂的时候，可使用多级表头来展现数据的层次关系</h4>

<Block Title="基础用法" Introduction="设置 <code>MultiHeaderTemplate</code> 模板即可">
    <Table TItem="Foo" OnQueryAsync="@OnQueryAsync" IsBordered="true" IsStriped="true">
        <MultiHeaderTemplate>
            <tr>
                <th rowspan="2"><div class="table-cell" style="height: 94px; justify-content: center;">时间</div></th>
                <th colspan="2"><div class="table-cell" style="justify-content: center">个人信息</div></th>
            </tr>
            <tr>
                <th><div class="table-cell">个人姓名</div></th>
                <th><div class="table-cell">个人地址</div></th>
            </tr>
        </MultiHeaderTemplate>
        <TableColumns>
            <TableColumn @bind-Field="@context.DateTime" Width="180" Filterable="true" Sortable="true" />
            <TableColumn @bind-Field="@context.Name" Width="100" Filterable="true" Sortable="true" />
            <TableColumn @bind-Field="@context.Address" Filterable="true" Sortable="true" />
        </TableColumns>
    </Table>
</Block>

// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

using BootstrapBlazor.Components;
using BootstrapBlazor.Shared.Pages.Components;
using Microsoft.AspNetCore.Components;
using Microsoft.Extensions.Localization;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;

namespace BootstrapBlazor.Shared.Pages.Table
{
    /// <summary>
    /// 
    /// </summary>
    public partial class TablesHeader
    {
        [NotNull]
        private List<Foo>? Items { get; set; }

        [Inject]
        [NotNull]
        private IStringLocalizer<Foo>? Localizer { get; set; }

        private static readonly ConcurrentDictionary<Type, Func<IEnumerable<Foo>, string, SortOrder, IEnumerable<Foo>>> SortLambdaCache = new();

        /// <summary>
        /// OnInitialized 方法
        /// </summary>
        protected override void OnInitialized()
        {
            base.OnInitialized();

            Items = Foo.GenerateFoo(Localizer);
        }

        private Task<QueryData<Foo>> OnQueryAsync(QueryPageOptions options)
        {
            IEnumerable<Foo> items = Items;

            // 过滤
            var isFiltered = false;
            if (options.Filters.Any())
            {
                items = items.Where(options.Filters.GetFilterFunc<Foo>());
                isFiltered = true;
            }

            // 排序
            var isSorted = false;
            if (!string.IsNullOrEmpty(options.SortName))
            {
                var invoker = SortLambdaCache.GetOrAdd(typeof(Foo), key => LambdaExtensions.GetSortLambda<Foo>().Compile());
                items = invoker(items, options.SortName, options.SortOrder);
                isSorted = true;
            }

            // 设置记录总数
            var total = items.Count();

            // 内存分页
            items = items.Skip((options.PageIndex - 1) * options.PageItems).Take(options.PageItems).ToList();

            return Task.FromResult(new QueryData<Foo>()
            {
                Items = items,
                TotalCount = total,
                IsSorted = isSorted,
                IsFiltered = isFiltered,
                IsSearch = true
            });
        }
    }
}