@inherits BootstrapComponentBase
@page "/tables/tree"

<h3>Table 树形数据展示</h3>

<h4>表格支持树形数据的展示</h4>

<Tips>
    <div>通过 <code>IsTree</code> 参数控制是否为树形数据，通过 <code>ChildrenColumnName</code> 参数设置树形数据列，通过 <code>HasChildrenColumnName</code> 参数控制当前行是否有子数据，点击子项展开小箭头时，通过 <code>OnTreeExpand</code> 回调委托方法获取子项数据</div>
</Tips>

<Block Title="树形数据展示" Introduction="当数据中有 <code>Children</code> 字段时会自动展示为树形表格，如果不需要或配置为其他字段可以用 <code>ChildrenColumnName</code> 进行配置。">
    <Tips>
        <div>出于性能考虑，默认子项未展开，点击小箭头后，触发 <code>OnTreeExpand</code> 回调委托方法，再此方法中对当前行的子数据进行赋值，<code>Table</code> 组件进行渲染新数据</div>
    </Tips>
    <Table TItem="FooTree" IsBordered="true" IsStriped="true" HeaderStyle="@TableHeaderStyle.Light"
           Items="@TreeItems" IsTree="true" OnTreeExpand="@OnTreeExpand">
        <TableColumns>
            <TableColumn @bind-Field="@context.Name" Width="360" />
            <TableColumn @bind-Field="@context.DateTime" Width="180" />
            <TableColumn @bind-Field="@context.Address" />
            <TableColumn @bind-Field="@context.Count" />
        </TableColumns>
    </Table>
</Block>

<Block Title="层次缩进" Introduction="通过设置 <code>IndentSize</code> 以控制每一层的缩进宽度。">
    <Tips>
        <div>默认层次缩进宽度为 <code>16px</code> 通过设置 <code>Indent</code> 更改缩进宽度</div>
    </Tips>
    <p>本例中更改缩进宽度为 <code>8px</code></p>
    <Table TItem="FooTree" IsBordered="true" IsStriped="true" HeaderStyle="@TableHeaderStyle.Light"
           Items="@TreeItems" IsTree="true" OnTreeExpand="@OnTreeExpand" IndentSize="8">
        <TableColumns>
            <TableColumn @bind-Field="@context.Name" Width="360" />
            <TableColumn @bind-Field="@context.DateTime" Width="180" />
            <TableColumn @bind-Field="@context.Address" />
            <TableColumn @bind-Field="@context.Count" />
        </TableColumns>
    </Table>
</Block>

<Block Title="具有单表维护功能的树形数据" Introduction="实现简单的增、删、改、查功能。">
    <Tips>
        <div>通过在实体的唯一标识字段上定义 <code>[Key]</code> 特性，来保持展开状态</div>
    </Tips>
    <Table TItem="EditFooTree" IsBordered="true" HeaderStyle="@TableHeaderStyle.Light"
           ShowToolbar="true" ShowExtendButtons="true" ShowSkeleton="true" IsStriped="true"
           OnQueryAsync="@OnQueryAsync" OnAddAsync="@OnAddAsync" OnSaveAsync="@OnSaveAsync"
           OnDeleteAsync="@OnDeleteAsync" IsTree="true" OnTreeExpand="@OnTreeExpandQuary">
        <TableColumns>
            <TableColumn @bind-Field="@context.Id" />
            <TableColumn @bind-Field="@context.Name" Width="360" />
            <TableColumn @bind-Field="@context.DateTime" Width="180" />
            <TableColumn @bind-Field="@context.Address" />
            <TableColumn @bind-Field="@context.Count" />
            <TableColumn @bind-Field="@context.ParentId" />
        </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.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;

namespace BootstrapBlazor.Shared.Pages.Table
{
    /// <summary>
    /// 树形数据演示示例代码
    /// </summary>
    public partial class TablesTree
    {
        [NotNull]
        private List<EditFooTree>? AllItems { get; set; }

        [NotNull]
        private IEnumerable<FooTree>? TreeItems { get; set; }

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

        private int level = 0;

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

            TreeItems = FooTree.Generate(Localizer);
            AllItems = new List<EditFooTree>();
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 10, 1));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 20, 2));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 30, 11));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 40, 12));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 50, 21));
            AllItems.AddRange(EditFooTree.Generate(Localizer, AllItems, 60, 22));
        }

        private async Task<IEnumerable<FooTree>> OnTreeExpand(FooTree foo)
        {
            await Task.Delay(1000);
            return FooTree.Generate(Localizer, level++ < 2, foo.Id + 10).Select(i =>
            {
                i.Name = Localizer["Foo.Name", $"{foo.Id:d2}{i.Id:d2}"];
                return i;
            });
        }

        private Task<EditFooTree> OnAddAsync() => Task.FromResult(new EditFooTree() { AllItems = AllItems, DateTime = DateTime.Now });

        private Task<bool> OnSaveAsync(EditFooTree item, ItemChangedType changedType)
        {
            if (changedType == ItemChangedType.Add)
            {
                item.Id = AllItems.Max(i => i.Id) + 1;
                AllItems.Add(item);
            }
            else
            {
                var oldItem = AllItems.FirstOrDefault(i => i.Id == item.Id);
                if (oldItem != null)
                {
                    oldItem.ParentId = item.ParentId;
                    oldItem.Name = item.Name;
                    oldItem.DateTime = item.DateTime;
                    oldItem.Address = item.Address;
                    oldItem.Count = item.Count;
                }
            }
            return Task.FromResult(true);
        }

        private Task<bool> OnDeleteAsync(IEnumerable<EditFooTree> items)
        {
            items.ToList().ForEach(i => AllItems.Remove(i));
            return Task.FromResult(true);
        }

        private Task<QueryData<EditFooTree>> OnQueryAsync(QueryPageOptions _)
        {
            return Task.FromResult(new QueryData<EditFooTree>()
            {
                Items = AllItems.Where(f => f.ParentId == 0)
            });
        }

        private async Task<IEnumerable<EditFooTree>> OnTreeExpandQuary(EditFooTree foo)
        {
            await Task.Delay(50);
            return AllItems.Where(f => f.ParentId == foo.Id);
        }

        private class FooTree : Foo
        {
            private static readonly Random random = new();

            public IEnumerable<FooTree>? Children { get; set; }

            public bool HasChildren { get; set; }

            public static IEnumerable<FooTree> Generate(IStringLocalizer<Foo> localizer, bool hasChildren = true, int seed = 0) => Enumerable.Range(1, 2).Select(i => new FooTree()
            {
                Id = i + seed,
                Name = localizer["Foo.Name", $"{seed:d2}{(i + seed):d2}"],
                DateTime = System.DateTime.Now.AddDays(i - 1),
                Address = localizer["Foo.Address", $"{random.Next(1000, 2000)}"],
                Count = random.Next(1, 100),
                Complete = random.Next(1, 100) > 50,
                Education = random.Next(1, 100) > 50 ? EnumEducation.Primary : EnumEducation.Middel,
                HasChildren = hasChildren
            }).ToList();
        }

        private class EditFooTree : Foo
        {
            private static readonly Random random = new();

            [NotNull]
            public List<EditFooTree>? AllItems { get; set; }

            public int ParentId { get; set; }

            public IEnumerable<EditFooTree>? Children { get; set; }

            public bool HasChildren => AllItems.Any(i => i.ParentId == Id);

            public static IEnumerable<EditFooTree> Generate(IStringLocalizer<Foo> localizer, List<EditFooTree> list, int seed = 0, int parentId = 0) => Enumerable.Range(1, 2).Select(i => new EditFooTree()
            {
                Id = i + seed,
                ParentId = parentId,
                Name = localizer["Foo.Name", $"{seed:d2}{(i + seed):d2}"],
                DateTime = System.DateTime.Now.AddDays(i - 1),
                Address = localizer["Foo.Address", $"{random.Next(1000, 2000)}"],
                Count = random.Next(1, 100),
                AllItems = list
            }).ToList();
        }
    }
}