using CustomEvent;
using Entity;
using Entity.EntityData;
using Entity.Weapon;
using GameFramework.Event;
using UnityEngine;

namespace Simulation
{
    public sealed partial class SimulationWorld
    {
        [Header("投射物命中表现")]
        [Tooltip("是否监听投射物命中表现事件。")]
        [SerializeField]
        private bool _projectileHitPresentationEnabled = true;

        [Tooltip("是否播放投射物命中标记。")]
        [SerializeField]
        private bool _projectileHitMarkerEnabled = true;

        [Tooltip("命中标记尺寸。")][SerializeField] private float _projectileHitMarkerSize = 0.2f;

        [Tooltip("命中标记在目标上的高度偏移。")]
        [SerializeField]
        private float _projectileHitMarkerYOffset = 1.2f;

        [Tooltip("命中标记持续时间。")]
        [SerializeField]
        private float _projectileHitMarkerDuration = 0.15f;

        [Tooltip("命中标记颜色。")][SerializeField] private Color _projectileHitMarkerColor = new(1f, 0f, 0f, 0.95f);

        [Tooltip("是否播放投射物命中特效实体。")]
        [SerializeField]
        private bool _projectileHitEffectEnabled;

        [Tooltip("投射物命中特效实体类型 Id（<=0 表示不启用）。")]
        [SerializeField]
        private int _projectileHitEffectTypeId;

        private sealed class HitPresentation
        {
            private readonly SimulationWorld _world;
            private HandgunHitMarkerAttackEffect _projectileHitMarkerEffect;
            private bool _isProjectileHitEventSubscribed;

            public HitPresentation(SimulationWorld world)
            {
                _world = world;
            }

            public void OnStart()
            {
                if (_world == null || !_world._projectileHitPresentationEnabled)
                {
                    return;
                }

                var eventComponent = GameEntry.Event;
                if (eventComponent == null)
                {
                    return;
                }

                eventComponent.Subscribe(ProjectileHitPresentationEventArgs.EventId, OnProjectileHitPresentationEvent);
                _isProjectileHitEventSubscribed = true;
            }

            public void OnDestroy()
            {
                if (!_isProjectileHitEventSubscribed)
                {
                    return;
                }

                var eventComponent = GameEntry.Event;
                if (eventComponent != null)
                {
                    eventComponent.Unsubscribe(ProjectileHitPresentationEventArgs.EventId,
                        OnProjectileHitPresentationEvent);
                }

                _isProjectileHitEventSubscribed = false;
            }

            private void OnProjectileHitPresentationEvent(object sender, GameEventArgs e)
            {
                if (!_isProjectileHitEventSubscribed || _world == null ||
                    e is not ProjectileHitPresentationEventArgs args)
                {
                    return;
                }

                if (args.ShowHitMarker && _world._projectileHitMarkerEnabled)
                {
                    PlayHitMarker(args);
                }

                if (args.ShowHitEffect && _world._projectileHitEffectEnabled)
                {
                    PlayHitEffect(args);
                }
            }

            private void PlayHitMarker(ProjectileHitPresentationEventArgs args)
            {
                // Projectile hit markers were reusing the handgun marker effect and were
                // visually indistinguishable from handgun lock/hit feedback.
            }

            private void PlayHitEffect(ProjectileHitPresentationEventArgs args)
            {
                int effectTypeId = args.EffectEntityTypeId > 0
                    ? args.EffectEntityTypeId
                    : _world._projectileHitEffectTypeId;
                if (effectTypeId <= 0)
                {
                    return;
                }

                var entityComponent = GameEntry.Entity;
                if (entityComponent == null)
                {
                    return;
                }

                EffectData effectData = new EffectData(entityComponent.GenerateSerialId(), effectTypeId)
                {
                    Position = args.HitPosition
                };
                entityComponent.ShowEffect(effectData);
            }
        }
    }
}