using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Data;
using Avalonia.Interactivity;
using Avalonia.Layout;
using Avalonia.Markup.Xaml;
using Avalonia.Media;
using Avalonia.Threading;
using DynamicData;
using DispenserCommon.Atrributes;
using DispenserCommon.Utils;
using Masuit.Tools;

namespace DispenserUI.Views.Controls;

public partial class Table : UserControl
{
    public static readonly StyledProperty<IEnumerable> ItemsProperty =
        AvaloniaProperty.Register<Table, IEnumerable>(nameof(Items));

    public static readonly StyledProperty<int> TotalProperty =
        AvaloniaProperty.Register<Table, int>(nameof(Total));

    public static readonly StyledProperty<int> PageSizeProperty =
        AvaloniaProperty.Register<Table, int>(nameof(PageSize));

    public static readonly StyledProperty<int> CurrentPageProperty =
        AvaloniaProperty.Register<Table, int>(nameof(CurrentPage));

    public static readonly StyledProperty<int> PagesProperty =
        AvaloniaProperty.Register<Table, int>(nameof(Pages));

    public static readonly StyledProperty<bool> ShowIndexProperty =
        AvaloniaProperty.Register<Table, bool>(nameof(ShowIndex), true);

    public static readonly StyledProperty<int> MaxDisplayPagesProperty =
        AvaloniaProperty.Register<Table, int>(nameof(MaxDisplayPages), 10);


    public event EventHandler<int> NextPage;

    public event EventHandler<int> PreviousPage;

    public event EventHandler<int> PageChanged;

    public Table()
    {
        InitializeComponent();
        TableContent = this.FindControl<DataGrid>("TableContent");
        PrePageBtn = this.FindControl<Button>("PrePageBtn");
        NextPageBtn = this.FindControl<Button>("NextPageBtn");
        PageRepeater = this.FindControl<StackPanel>("PageRepeater");
        this.GetObservable(ItemsProperty).Subscribe(its =>
        {
            Items = its;
            Dispatcher.UIThread.InvokeAsync(RenderTable);
        });
        PrePageBtn!.Click += OnPreviousPage;
        NextPageBtn!.Click += OnNextPage;
    }

    private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
    }

    public IEnumerable Items
    {
        get => GetValue(ItemsProperty);
        set => SetValue(ItemsProperty, value);
    }

    public int Total
    {
        get => GetValue(TotalProperty);
        set => SetValue(TotalProperty, value);
    }

    public int PageSize
    {
        get => GetValue(PageSizeProperty);
        set => SetValue(PageSizeProperty, value);
    }

    public bool ShowIndex
    {
        get => GetValue(ShowIndexProperty);
        set => SetValue(ShowIndexProperty, value);
    }

    public int CurrentPage
    {
        get => GetValue(CurrentPageProperty);
        set => SetValue(CurrentPageProperty, value);
    }

    public int Pages
    {
        get => GetValue(PagesProperty);
        set => SetValue(PagesProperty, value);
    }

    public int MaxDisplayPages
    {
        get => GetValue(MaxDisplayPagesProperty);
        set => SetValue(MaxDisplayPagesProperty, value);
    }

    /// <summary>
    /// 上一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnPreviousPage(object? sender, RoutedEventArgs e)
    {
        if (CurrentPage == 1)
        {
            ToastUtil.Info("无上一页数据");
            return;
        }

        PreviousPage?.Invoke(this, CurrentPage - 1);
    }

    /// <summary>
    /// 下一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void OnNextPage(object? sender, RoutedEventArgs e)
    {
        if (CurrentPage == Pages)
        {
            ToastUtil.Info("无下一页数据");
            return;
        }

        NextPage?.Invoke(this, CurrentPage + 1);
    }

    private void RenderTable()
    {
        TableContent.ItemsSource = new List<object>();
        TableContent.Columns.Clear();

        if (Items.IsNullOrEmpty()) return;


        if (ShowIndex)
        {
            var index = new DataGridTextColumn
            {
                Header = "序号",
                Width = new DataGridLength(80),
                Binding = new Binding
                {
                    RelativeSource = new RelativeSource
                    {
                        Mode = RelativeSourceMode.FindAncestor,
                        AncestorType = typeof(DataGridRow),
                    },
                    Path = "Header"
                },
            };
            TableContent.Columns.Add(index);

            TableContent.LoadingRow += LoadingRow;
        }

        TableContent.ItemsSource = Items;

        List<DataGridTextColumn> columns = [];
        foreach (var item in Items)
        {
            var type = item.GetType();
            var properties =
                type.GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly);
            foreach (var property in properties)
            {
                var description = property.GetCustomAttribute<DescriptionAttribute>();
                var hide = property.GetCustomAttribute<Hide>();

                if (hide != null) continue;

                var column = new DataGridTextColumn
                {
                    Header = description!.Description,
                    Binding = new Binding(property.Name),
                    Width = new DataGridLength(1, DataGridLengthUnitType.Star)
                };
                columns.Add(column);
            }

            TableContent.Columns.AddRange(columns);
            break;
        }

        // 计算显示的起始页和结束页
        int startPage = Math.Max(1, CurrentPage - MaxDisplayPages / 2);
        int endPage = Math.Min(Pages, startPage + MaxDisplayPages - 1);

        // 如果起始页被推前了（例如，当前页靠近总页数末尾）
        if (endPage - startPage + 1 < MaxDisplayPages)
        {
            startPage = Math.Max(1, endPage - MaxDisplayPages + 1);
        }

        // 渲染导航栏,最多只显示10页
        List<Button> pageButtons = [];
        for (var i = startPage; i <= endPage; i++)
        {
            var page = i;
            var btn = new Button
            {
                Content = i,
                Width = 30,
                Height = 30,
                Foreground = Brushes.Black,
                FontSize = 12,
                Background = Brushes.Transparent,
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalContentAlignment = VerticalAlignment.Center,
                Margin = new Thickness(5, 0, 5, 0)
            };
            if (i == CurrentPage)
            {
                btn.Foreground = Brushes.DodgerBlue;
                btn.FontWeight = FontWeight.Bold;
            }

            btn.Click += (sender, args) =>
            {
                CurrentPage = page;
                PageChanged?.Invoke(this, page);
            };

            pageButtons.Add(btn);
        }

        PageRepeater.Children.Clear();
        PageRepeater.Children.AddRange(pageButtons);
    }

    private void LoadingRow(object? sender, DataGridRowEventArgs e)
    {
        e.Row.Header = e.Row.GetIndex() + 1;
    }
}