using Avalonia;
using Avalonia.Controls;
using Avalonia.Data;

namespace Cowain.Base.Helpers;

public class GridDefinitionsHelper
{
    // 定义Rows附加属性
    public static readonly AttachedProperty<int> RowsProperty =
        AvaloniaProperty.RegisterAttached<GridDefinitionsHelper, Grid, int>("Rows", 0);

    // 定义Columns附加属性
    public static readonly AttachedProperty<int> ColumnsProperty =
        AvaloniaProperty.RegisterAttached<GridDefinitionsHelper, Grid, int>("Columns", 0);

    // 定义RowHeight附加属性
    public static readonly AttachedProperty<string> RowHeightProperty =
        AvaloniaProperty.RegisterAttached<GridDefinitionsHelper, Grid, string>("RowHeight", "Auto");

    // 定义ColumnWidth附加属性
    public static readonly AttachedProperty<string> ColumnWidthProperty =
        AvaloniaProperty.RegisterAttached<GridDefinitionsHelper, Grid, string>("ColumnWidth", "Auto");

    // Getter和Setter方法
    public static int GetRows(AvaloniaObject element) => element.GetValue(RowsProperty);
    public static void SetRows(AvaloniaObject element, int value) => element.SetValue(RowsProperty, value);

    public static int GetColumns(AvaloniaObject element) => element.GetValue(ColumnsProperty);
    public static void SetColumns(AvaloniaObject element, int value) => element.SetValue(ColumnsProperty, value);

    public static string GetRowHeight(AvaloniaObject element) => element.GetValue(RowHeightProperty);
    public static void SetRowHeight(AvaloniaObject element, string value) => element.SetValue(RowHeightProperty, value);

    public static string GetColumnWidth(AvaloniaObject element) => element.GetValue(ColumnWidthProperty);
    public static void SetColumnWidth(AvaloniaObject element, string value) => element.SetValue(ColumnWidthProperty, value);

    static GridDefinitionsHelper()
    {
        // 监听Rows属性变化
        RowsProperty.Changed.AddClassHandler<Grid>((grid, e) => UpdateGridDefinitions(grid));

        // 监听Columns属性变化
        ColumnsProperty.Changed.AddClassHandler<Grid>((grid, e) => UpdateGridDefinitions(grid));

        // 监听RowHeight属性变化
        RowHeightProperty.Changed.AddClassHandler<Grid>((grid, e) => UpdateGridDefinitions(grid));

        // 监听ColumnWidth属性变化
        ColumnWidthProperty.Changed.AddClassHandler<Grid>((grid, e) => UpdateGridDefinitions(grid));
    }

    private static void UpdateGridDefinitions(Grid grid)
    {
        int rows = GetRows(grid);
        int columns = GetColumns(grid);
        string rowHeight = GetRowHeight(grid);
        string columnWidth = GetColumnWidth(grid);

        // 更新行定义
        grid.RowDefinitions.Clear();
        var height = ParseDimension(rowHeight);
        for (int i = 0; i < rows; i++)
        {
            grid.RowDefinitions.Add(new RowDefinition(height));
        }

        // 更新列定义
        grid.ColumnDefinitions.Clear();
        var width = ParseDimension(columnWidth);
        for (int i = 0; i < columns; i++)
        {
            grid.ColumnDefinitions.Add(new ColumnDefinition(width));
        }
    }

    private static GridLength ParseDimension(string value)
    {
        if (string.IsNullOrEmpty(value))
            return GridLength.Auto;

        value = value.Trim();
        if (value.EndsWith("*"))
        {
            if (value.Length == 1)
                return new GridLength(1, GridUnitType.Star);

            if (double.TryParse(value.Substring(0, value.Length - 1), out double starValue))
                return new GridLength(starValue, GridUnitType.Star);
        }
        else if (double.TryParse(value, out double pixelValue))
        {
            return new GridLength(pixelValue, GridUnitType.Pixel);
        }

        return GridLength.Auto;
    }
}