using System.Collections.Generic;
using CounterDrone.Core.Algorithms;
using CounterDrone.Core.Models;
using Xunit;

namespace CounterDrone.Core.Tests
{
    public class DefenseAdvisorRealityTests
    {
        private static readonly List<AmmunitionSpec> TestAmmo = new()
        {
            new AmmunitionSpec { AerosolType = (int)AerosolType.InertGas, InitialRadius = 50, CoreDensity = 1.0, DispersionRateBase = 5, MaxRadius = 200, MaxDuration = 60 },
            new AmmunitionSpec { AerosolType = (int)AerosolType.ActiveMaterial, InitialRadius = 30, CoreDensity = 2.0, DispersionRateBase = 3, MaxRadius = 150, MaxDuration = 45 },
        };

        [Fact]
        public void PistonDrone_RecommendsReachableCloudPosition()
        {
            var threat = new ThreatProfile
            {
                Environment = new CombatScene
                {
                    WindSpeed = 3,
                    WindDirection = (int)WindDirection.W,
                },
                Targets = new List<TargetConfig>
                {
                    new TargetConfig
                    {
                        TargetType = (int)TargetType.Piston,
                        PowerType = (int)PowerType.Piston,
                        Quantity = 1, TypicalSpeed = 200, TypicalAltitude = 500,
                    },
                },
                Route = new RoutePlan { FormationMode = (int)FormationMode.Single },
                Waypoints = new List<Waypoint>
                {
                    new Waypoint { PosX = 0, PosY = 500, PosZ = 0, Speed = 200 },
                    new Waypoint { PosX = 20000, PosY = 500, PosZ = 0, Speed = 200 },
                },
            };

            var advisor = new DefaultDefenseAdvisor(TestAmmo);
            var rec = advisor.Recommend(threat);

            // 1. 选型正确
            Assert.Equal(AerosolType.InertGas, rec.Best.RecommendedAerosolType);

            // 2. 云团位置应在航路上
            var c = rec.Best.RecommendedCloud;
            Assert.True(c.PositionX > 0 && c.PositionX < 20000,
                $"云团 X={c.PositionX} 应在航路范围内");
            Assert.True(c.PositionY >= 400 && c.PositionY <= 600,
                $"云团 Y={c.PositionY} 应接近飞行高度 500");

            // 3. 平台部署应有合理位置
            Assert.NotEmpty(rec.Best.Platforms);
            var p = rec.Best.Platforms[0];

            // 4. 炮弹能打到吗？用运动学验证
            var muzzleV = 800f;
            var releaseAlt = (float)c.DisperseHeight;
            var targetDist = (float)System.Math.Sqrt(
                (c.PositionX - p.Position.X) * (c.PositionX - p.Position.X) +
                (c.PositionZ - p.Position.Z) * (c.PositionZ - p.Position.Z));

            var launchAngle = Kinematics.CalculateLaunchAngle(targetDist, muzzleV, releaseAlt);
            Assert.True(launchAngle > 0 && launchAngle < 1.57f,
                $"发射角 {launchAngle * 180 / System.Math.PI:F1}° 应在 0-90°");

            // 5. 弹道能到达释放高度
            var peakHeight = muzzleV * muzzleV * (float)System.Math.Sin(launchAngle)
                * (float)System.Math.Sin(launchAngle) / (2f * 9.81f);
            Assert.True(peakHeight >= releaseAlt,
                $"弹道顶点 {peakHeight:F0}m ≥ 释放高度 {releaseAlt:F0}m");
        }
    }
}