using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using Avalonia.Threading;
using System;

namespace YZWater.Avalonia.Controls;

/// <summary>
/// 管道控件 - 模拟 PipeLine
/// </summary>
public class PipeLineControl : Control
{
    public static readonly StyledProperty<bool> IsFlowProperty =
        AvaloniaProperty.Register<PipeLineControl, bool>(nameof(IsFlow), false);

    public static readonly StyledProperty<double> FlowSpeedProperty =
        AvaloniaProperty.Register<PipeLineControl, double>(nameof(FlowSpeed), 1.0);

    public static readonly StyledProperty<IBrush> PipeColorProperty =
        AvaloniaProperty.Register<PipeLineControl, IBrush>(nameof(PipeColor), new SolidColorBrush(Color.Parse("#4CAF50")));

    public static readonly StyledProperty<IBrush> WaterColorProperty =
        AvaloniaProperty.Register<PipeLineControl, IBrush>(nameof(WaterColor), new SolidColorBrush(Color.Parse("#2196F3")));

    public static readonly StyledProperty<double> PipeWidthProperty =
        AvaloniaProperty.Register<PipeLineControl, double>(nameof(PipeWidth), 20.0);

    public static readonly StyledProperty<bool> IsHorizontalProperty =
        AvaloniaProperty.Register<PipeLineControl, bool>(nameof(IsHorizontal), true);

    public bool IsFlow
    {
        get => GetValue(IsFlowProperty);
        set => SetValue(IsFlowProperty, value);
    }

    public double FlowSpeed
    {
        get => GetValue(FlowSpeedProperty);
        set => SetValue(FlowSpeedProperty, value);
    }

    public IBrush PipeColor
    {
        get => GetValue(PipeColorProperty);
        set => SetValue(PipeColorProperty, value);
    }

    public IBrush WaterColor
    {
        get => GetValue(WaterColorProperty);
        set => SetValue(WaterColorProperty, value);
    }

    public double PipeWidth
    {
        get => GetValue(PipeWidthProperty);
        set => SetValue(PipeWidthProperty, value);
    }

    public bool IsHorizontal
    {
        get => GetValue(IsHorizontalProperty);
        set => SetValue(IsHorizontalProperty, value);
    }

    private double _flowOffset = 0;
    private IDisposable? _timerSubscription;

    static PipeLineControl()
    {
        AffectsRender<PipeLineControl>(IsFlowProperty, FlowSpeedProperty, PipeColorProperty, WaterColorProperty, PipeWidthProperty, IsHorizontalProperty);
    }

    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
    {
        base.OnAttachedToVisualTree(e);
        if (IsFlow)
        {
            StartAnimation();
        }
    }

    protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
    {
        base.OnDetachedFromVisualTree(e);
        StopAnimation();
    }

    protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
    {
        base.OnPropertyChanged(change);
        if (change.Property == IsFlowProperty)
        {
            if (IsFlow)
            {
                StartAnimation();
            }
            else
            {
                StopAnimation();
                _flowOffset = 0;
            }
        }
    }

    private void StartAnimation()
    {
        StopAnimation();
        _timerSubscription = DispatcherTimer.Run(() =>
        {
            _flowOffset += FlowSpeed;
            if (_flowOffset >= 20) _flowOffset -= 20;
            InvalidateVisual();
            return true; // 继续运行
        }, TimeSpan.FromMilliseconds(50));
    }

    private void StopAnimation()
    {
        _timerSubscription?.Dispose();
        _timerSubscription = null;
    }

    public override void Render(DrawingContext context)
    {
        base.Render(context);

        var bounds = new Rect(Bounds.Size);
        var pipeWidth = PipeWidth;

        if (IsHorizontal)
        {
            // 绘制水平管道
            var pipeRect = new Rect(0, (bounds.Height - pipeWidth) / 2, bounds.Width, pipeWidth);
            context.DrawRectangle(PipeColor, null, pipeRect);

            // 绘制流动效果
            if (IsFlow)
            {
                var dashPen = new Pen(WaterColor, pipeWidth * 0.6, new DashStyle(new double[] { 8, 12 }, _flowOffset));
                var y = bounds.Height / 2;
                context.DrawLine(dashPen, new Point(0, y), new Point(bounds.Width, y));
            }
        }
        else
        {
            // 绘制垂直管道
            var pipeRect = new Rect((bounds.Width - pipeWidth) / 2, 0, pipeWidth, bounds.Height);
            context.DrawRectangle(PipeColor, null, pipeRect);

            // 绘制流动效果
            if (IsFlow)
            {
                var dashPen = new Pen(WaterColor, pipeWidth * 0.6, new DashStyle(new double[] { 8, 12 }, _flowOffset));
                var x = bounds.Width / 2;
                context.DrawLine(dashPen, new Point(x, 0), new Point(x, bounds.Height));
            }
        }
    }

    protected override Size MeasureOverride(Size availableSize)
    {
        return IsHorizontal ? new Size(80, 30) : new Size(30, 80);
    }
}