using System;
using System.Collections.Generic;
using System.Reflection;
using Ichni.RhythmGame.Beatmap;
using UnityEngine;

namespace Ichni.RhythmGame
{
    public class PropertyAnimationFloat : AnimationBase
    {
        #region [暴露属性字段与关联] Exposed Fields & References
        public string componentName;
        public string propertyName;
        public FlexibleFloat propertyValue;

        private Component targetComponent;
        private FieldInfo targetField;
        private PropertyInfo targetProperty;
        
        // 我们尝试通过原生的 Action 来降低反射 SetValue 带来的性能损耗（装箱与GC）
        private Action<float> floatSetterDelegate;
        #endregion

        #region [生命周期与工厂] Lifecycle & Factory
        public static PropertyAnimationFloat GenerateElement(string elementName, Guid id, List<string> tags, bool isFirstGenerated,
            GameElement animatedObject, string componentName, string propertyName, FlexibleFloat propertyValue)
        {
            PropertyAnimationFloat animation = Instantiate(GameManager.Instance.basePrefabs.emptyObject)
                .AddComponent<PropertyAnimationFloat>();
            
            animation.Initialize(elementName, id, tags, isFirstGenerated, animatedObject);

            animation.animatedObject = animatedObject;

            animation.componentName = componentName;
            animation.propertyName = propertyName;
            animation.propertyValue = propertyValue;

            return animation;
        }

        public override void AfterInitialize()
        {
            if (animatedObject == null || string.IsNullOrEmpty(componentName)) return;

            Type componentType = GetTypeFromAllAssemblies(componentName);
            if (componentType != null)
            {
                targetComponent = animatedObject.GetComponentInChildren(componentType);
            }

            if (targetComponent != null)
            {
                InitializeReflection();
            }
            else
            {
                Debug.LogWarning($"[PropertyAnimationFloat] Cannot find Component '{componentName}' strictly on '{animatedObject.name}'.");
            }
            
            base.AfterInitialize();
        }
        
        private Type GetTypeFromAllAssemblies(string typeName)
        {
            // 对于跨程序集的搜索
            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
            {
                Type type = assembly.GetType(typeName);
                if (type != null) return type;
            }
            return null;
        }

        private void InitializeReflection()
        {
            Type type = targetComponent.GetType();

            // 1. 尝试寻找 Property
            targetProperty = type.GetProperty(propertyName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
            if (targetProperty != null && targetProperty.CanWrite)
            {
                MethodInfo setMethod = targetProperty.GetSetMethod(nonPublic: true);
                if (setMethod != null)
                {
                    try
                    {
                        floatSetterDelegate = (Action<float>)Delegate.CreateDelegate(typeof(Action<float>), targetComponent, setMethod);
                        return; // 建立快速委托成功！
                    }
                    catch { /* 回落 */ }
                }
            }

            // 2. 尝试寻找 Field (直接包含公有/私有)
            targetField = type.GetField(propertyName, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
            if (targetField == null && targetProperty == null)
            {
                Debug.LogWarning($"[PropertyAnimationFloat] Cannot find target Property or Field '{propertyName}' strictly on '{componentName}'.");
            }
        }
        #endregion

        #region [核心动画逻辑] Core Animation Logic
        protected override void UpdateAnimation(float songTime, bool forceUpdate)
        {
            if (targetComponent == null || propertyValue == null || propertyValue.animations.Count == 0) return;

            propertyValue.UpdateFlexibleFloat(songTime);
            float value = propertyValue.value;

            if (floatSetterDelegate != null)
            {
                floatSetterDelegate(value); 
            }
            else if (targetProperty != null)
            {
                targetProperty.SetValue(targetComponent, value);
            }
            else if (targetField != null)
            {
                targetField.SetValue(targetComponent, value);
            }
            
            if (animatedObject is IHaveDirtyMarkSubmodule dirtyTarget)
            {
                dirtyTarget.dirtyMarkSubmodule.MarkDirty(propertyName);
            }
        }
        
        public override void ApplyTimeOffset(float offset)
        {
            base.ApplyTimeOffset(offset);
            if (propertyValue != null && propertyValue.animations != null)
            {
                foreach(var a in propertyValue.animations)
                {
                    a.startTime += offset;
                    a.endTime += offset;
                }
            }
        }
        #endregion
    }
}