using CounterDrone.Core.Algorithms;
using CounterDrone.Core.Models;
using Xunit;

namespace CounterDrone.Core.Tests
{
    public class KinematicsTests
    {
        [Fact]
        public void WindToVector_East_CorrectDirection()
        {
            var (x, y, z) = Kinematics.WindToVector(WindDirection.E, 10f);
            Assert.True(x > 9f, "东风 → X 正方向");
            Assert.True(System.Math.Abs(z) < 1f, "东风 → Z 接近 0");
            Assert.Equal(0f, y, 3);
        }

        [Fact]
        public void WindToVector_North_CorrectDirection()
        {
            var (x, y, z) = Kinematics.WindToVector(WindDirection.N, 10f);
            Assert.True(System.Math.Abs(x) < 1f);
            Assert.True(z > 9f, "北风 → Z 正方向");
        }

        [Fact]
        public void CalculateLaunchAngle_ReturnsValidAngle()
        {
            var angle = Kinematics.CalculateLaunchAngle(5000f, 500f, 300f);
            Assert.True(angle > 0);
            Assert.True(angle < System.Math.PI / 2); // < 90°
        }

        [Fact]
        public void CalculateLaunchAngle_CloseRange_UsesHeightConstraint()
        {
            // 近距离，高度约束应主导
            var angle = Kinematics.CalculateLaunchAngle(1000f, 300f, 300f);
            Assert.True(angle > 0.05f, "近距离也有合理发射角");
        }

        [Fact]
        public void ParabolicPosition_T0_IsAtStart()
        {
            var (x, y, z) = Kinematics.ParabolicPosition(0, 0, 0, 0.5f, 0, 500f, 0);
            Assert.Equal(0f, x, 1);
            Assert.Equal(0f, y, 1);
            Assert.Equal(0f, z, 1);
        }

        [Fact]
        public void PointInPolygon_Inside_ReturnsTrue()
        {
            var vertices = new (float X, float Z)[] { (0, 0), (10, 0), (10, 10), (0, 10) };
            Assert.True(Kinematics.PointInPolygon(5, 5, vertices));
        }

        [Fact]
        public void PointInPolygon_Outside_ReturnsFalse()
        {
            var vertices = new (float X, float Z)[] { (0, 0), (10, 0), (10, 10), (0, 10) };
            Assert.False(Kinematics.PointInPolygon(20, 5, vertices));
        }
    }
}