using System;
using System.Collections.Generic;
using Cielonos.MainGame.Characters;
using Lean.Pool;
using Sirenix.OdinInspector;
using SoftCircuits.Collections;
using UnityEngine;
using UnityEngine.Serialization;

namespace Cielonos.MainGame
{
    [CreateAssetMenu(fileName = "VFXData", menuName = "Cielonos/VFXData")]
    public partial class VFXData : SerializedScriptableObject
    {
        [DictionaryDrawerSettings(KeyLabel = "VFX Name", DisplayMode = DictionaryDisplayOptions.ExpandedFoldout)]
        [Searchable]
        public OrderedDictionary<string, VFXUnit> collection = new OrderedDictionary<string, VFXUnit>();
        
        public VFXUnit Get(string effectName) => collection[effectName];
    }
    
    public partial class VFXData
    {
        //Runtime
        [NonSerialized] private CharacterBase executor;
        [NonSerialized] private Transform executorTransform;
        
        public void Initialize(CharacterBase character)
        {
            executor = character;
            executorTransform = character.transform;
        }
        
        public GameObject SpawnVFX(string vfxName, Transform overrideStartTransform = null)
        {
            VFXUnit vfxUnit = Get(vfxName);
            
            Transform startTransform = overrideStartTransform ?? executorTransform;
            GameObject vfxInstance = VFXObject.Spawn(vfxUnit.mainVFX, executor, startTransform);
            Transform vfxTransform = vfxInstance.transform;
            
            vfxTransform.localPosition = vfxUnit.localPosition;
            vfxTransform.localEulerAngles = vfxUnit.localEulerAngles;
            vfxTransform.localScale = vfxUnit.localScale;
            
            if (!vfxUnit.keepLocalTransform)
            {
                vfxTransform.parent = null;
            }
            
            return vfxInstance;
        }
        
        public GameObject SpawnMuzzleVFX(string effectName, Transform muzzleTransform)
        {
            return VFXObject.Spawn(Get(effectName).muzzleVFX,  executor, muzzleTransform);
        }
        
        public GameObject SpawnHitVFX(string effectName, Vector3 hitPosition)
        {
            return VFXObject.Spawn(Get(effectName).muzzleVFX,  executor, hitPosition, Quaternion.identity);
        }
    }
    
    [Serializable]
    [HideReferenceObjectPicker]
    public class VFXUnit
    {
        [BoxGroup("VFX"), LabelWidth(150)]
        [PropertyTooltip("特效预制体")]
        public GameObject mainVFX;
        [BoxGroup("VFX"), LabelWidth(150)]
        [PropertyTooltip("枪口特效（可空）")]
        public GameObject muzzleVFX;
        [BoxGroup("VFX"), LabelWidth(150)]
        [PropertyTooltip("击中特效（可空），通常用于AttackArea获取，不需要使用VFXData生成")]
        public GameObject hitVFX;
        [BoxGroup("VFX"), LabelWidth(150)]
        [PropertyTooltip("附加特效（可空）")]
        public List<GameObject> otherVFXList;
        
        [BoxGroup("Transform"), LabelWidth(150)]
        [PropertyTooltip("特效生成时的位置偏移")]
        public Vector3 localPosition = Vector3.zero;
        [BoxGroup("Transform"), LabelWidth(150)]
        [PropertyTooltip("特效生成时的旋转角度")]
        public Vector3 localEulerAngles = Vector3.zero;
        [BoxGroup("Transform"), LabelWidth(150)]
        [PropertyTooltip("特效生成时的缩放比例")]
        public Vector3 localScale = Vector3.one;
        [BoxGroup("Transform"), LabelWidth(150)]
        [PropertyTooltip("是否在生成后保持特效与父级Transform的联系")]
        public bool keepLocalTransform = false;
        
        [Title("Tools")]
        [ShowInInspector]
        public Vector2 slashScreenDirection => GetSlashScreenDirection(true);
        [ShowInInspector]
        public Vector2 slashScreenPosition => GetSlashScreenDirection(false);
        
        [OnInspectorInit]
        public Vector2 GetSlashScreenDirection(bool isRotation)
        {
            // 1. 定义屏幕（摄像机）的法线。
            // 因为假设了角色和摄像机朝向一致，我们可以直接把这里当做 View Space。
            // 摄像机看向 Z+，屏幕平面垂直于 Z 轴，所以法线是 Vector3.forward。
            Vector3 screenNormal = Vector3.forward;

            // 2. 计算刀光平面的法线。
            // 刀光原本是 XZ 平面，法线是 Y+ (Vector3.up)。
            // 我们通过欧拉角旋转这个法线。
            Quaternion rotation = Quaternion.Euler(localEulerAngles);
            Vector3 slashNormal = rotation * Vector3.up;

            // 3. 计算交线向量（叉积）。
            // 几何原理：两个平面的交线垂直于这两个平面的法线。
            Vector3 intersectionLine = Vector3.Cross(slashNormal, screenNormal);

            // 4. 转换为 2D 向量。
            // 因为 intersectionLine 必定在屏幕平面上（垂直于 screenNormal），
            // 它的 Z 分量理论上应该是 0（或者非常接近 0），我们直接取 XY。
            Vector2 screenDir = isRotation ? 
                new Vector2(-intersectionLine.y, intersectionLine.x).normalized : 
                new Vector2(intersectionLine.x, intersectionLine.y).normalized;

            // 5. 处理特殊情况：平行。
            // 如果刀光平面和屏幕平行（比如刀光垂直立起来正对着摄像机），
            // 叉积结果会是 (0,0,0)。这时候没有“方向”可言。
            if (screenDir.sqrMagnitude < 0.0001f)
            {
                return Vector2.zero; // 或者根据需求返回默认值
            }
            
            
            // 6. 返回结果。
            // 将screenDir的x和y都乘以10之后，保留小数点后2位，得到最终的刀光屏幕方向。
            return new Vector2(
                (float)Math.Round(screenDir.x * 10f, 2),
                (float)Math.Round(screenDir.y * 10f, 2)
            );
        }
    }
}