using System;
using ActiveProtect.SimulationEnvironment;

namespace ActiveProtect.Models
{
    /// <summary>
    /// 红外成像末制导导弹
    /// </summary>
    public class InfraredImagingTerminalGuidedMissile : MissileBase
    {
        /// <summary>
        /// 红外成像末制导导弹阶段
        /// </summary>
        private enum IRTG_Stage
        {
            Launch,
            Cruise,
            TerminalGuidance,
            Explode,
            SelfDestruct
        }


        private IRTG_Stage currentStage;
        private readonly InfraredImagingGuidanceSystem guidanceSystem;
        private const double TERMINAL_GUIDANCE_DISTANCE = 1000; // 末制导开始距离(米)

        /// <summary>
        /// 红外成像末制导导弹构造函数
        /// </summary>
        public InfraredImagingTerminalGuidedMissile(MissileConfig config, ISimulationManager manager)
            : base(config, manager)
        {
            Type = MissileType.InfraredImagingTerminalGuidance;
            currentStage = IRTG_Stage.Launch;
            guidanceSystem = new InfraredImagingGuidanceSystem(config.MaxAcceleration, config.ProportionalNavigationCoefficient, manager);
        }

        /// <summary>
        /// 更新红外成像末制导导弹
        /// </summary>
        public override void Update(double deltaTime)
        {
            base.Update(deltaTime);

            switch (currentStage)
            {
                case IRTG_Stage.Launch:
                    UpdateLaunchStage(deltaTime);
                    break;
                case IRTG_Stage.Cruise:
                    UpdateCruiseStage(deltaTime);
                    break;
                case IRTG_Stage.TerminalGuidance:
                    UpdateTerminalGuidanceStage(deltaTime);
                    break;
                case IRTG_Stage.Explode:
                    Explode();
                    break;
                case IRTG_Stage.SelfDestruct:
                    SelfDestruct();
                    break;
            }

            if (ShouldSelfDestruct())
            {
                currentStage = IRTG_Stage.SelfDestruct;
            }
        }

        /// <summary>
        /// 更新发射阶段
        /// </summary>
        private void UpdateLaunchStage(double deltaTime)
        {
            // 实现发射阶段逻辑
            if (FlightTime > 0.1) // 假设发射阶段持续0.1秒
            {
                currentStage = IRTG_Stage.Cruise;
            }
        }

        /// <summary>
        /// 更新巡航阶段
        /// </summary>
        private void UpdateCruiseStage(double deltaTime)
        {
            // 实现巡航阶段逻辑
            if (DistanceToTarget <= TERMINAL_GUIDANCE_DISTANCE)
            {
                currentStage = IRTG_Stage.TerminalGuidance;
            }
        }

        /// <summary>
        /// 更新末制导阶段
        /// </summary>
        private void UpdateTerminalGuidanceStage(double deltaTime)
        {
            guidanceSystem.Update(deltaTime, Position, Velocity);
            GuidanceAcceleration = guidanceSystem.GetGuidanceAcceleration();

            if (DistanceToTarget <= ExplosionRadius)
            {
                currentStage = IRTG_Stage.Explode;
            }
        }

        /// <summary>
        /// 爆炸
        /// </summary>
        protected override void Explode()
        {
            base.Explode();
            currentStage = IRTG_Stage.Explode;
        }

        /// <summary>
        /// 获取导弹状态
        /// </summary>
        public override string GetStatus()
        {
            return base.GetStatus() + $"\n  当前阶段: {currentStage}" + guidanceSystem.GetStatus();
        }
    }
}