using System.Windows;
using OneClickRun.Helpers;
using Xunit;

namespace OneClickRun.Tests;

/// <summary>滑动选择：按方向角选取最近扇形的行为测试</summary>
public class WheelGeometrySwipeTests
{
    private const double InnerR = 70;
    private static readonly Point Center = new(300, 300);

    private static Point At(double angleDeg, double radius) =>
        WheelGeometry.PointOnCircle(Center, radius, angleDeg * Math.PI / 180);

    [Theory]
    [InlineData(4, -90, 0)]  // 上 → 扇形0
    [InlineData(4, 0, 1)]    // 右 → 扇形1
    [InlineData(4, 90, 2)]   // 下 → 扇形2
    [InlineData(4, 180, 3)]  // 左 → 扇形3
    [InlineData(3, -90, 0)]  // 上 → 扇形0
    [InlineData(3, 0, 0)]    // 右 → 扇形0（3:00 位于扇形0 区域内）
    [InlineData(3, 90, 1)]   // 下 → 扇形1
    [InlineData(3, 180, 2)]  // 左 → 扇形2
    [InlineData(12, 15, 3)]  // 12 扇区：15° 方向 → rel=105°，span=30° → 扇形3
    public void PicksSectorByDirection(int count, double angleDeg, int expected)
    {
        var point = At(angleDeg, (InnerR + 220) / 2);
        Assert.Equal(expected, WheelGeometry.PickSectorByAngle(point, Center, InnerR, count));
    }

    [Fact]
    public void CenterHubReturnsNull()
    {
        Assert.Null(WheelGeometry.PickSectorByAngle(Center, Center, InnerR, 4));
        Assert.Null(WheelGeometry.PickSectorByAngle(At(45, InnerR - 5), Center, InnerR, 4));
    }

    [Fact]
    public void BeyondOuterRadiusStillPicksByDirection()
    {
        // 快速滑动滑出圆环外：仍按方向命中
        Assert.Equal(0, WheelGeometry.PickSectorByAngle(At(-45, 800), Center, InnerR, 4));
        Assert.Equal(2, WheelGeometry.PickSectorByAngle(At(135, 2000), Center, InnerR, 4));
    }

    [Fact]
    public void GapAndBoundaryPickNearestSector()
    {
        // 4 扇区：89°/91° 位于 90° 边界两侧的间隙内，应就近归属扇形1/扇形2
        Assert.Equal(1, WheelGeometry.PickSectorByAngle(At(89, 145), Center, InnerR, 4));
        Assert.Equal(2, WheelGeometry.PickSectorByAngle(At(91, 145), Center, InnerR, 4));
        // 恰好正下方：边界平局 → 扇形2
        Assert.Equal(2, WheelGeometry.PickSectorByAngle(At(90, 145), Center, InnerR, 4));
    }

    [Fact]
    public void SingleSectorPicksAnyDirection()
    {
        Assert.Equal(0, WheelGeometry.PickSectorByAngle(At(0, 300), Center, InnerR, 1));
        Assert.Equal(0, WheelGeometry.PickSectorByAngle(At(213, 300), Center, InnerR, 1));
        Assert.Null(WheelGeometry.PickSectorByAngle(Center, Center, InnerR, 1));
    }
}