using System;
using UnityEditor;
using UnityEngine;
using BaseGames.Core.Events;

namespace BaseGames.Editor
{
    /// <summary>
    /// 为 VoidEventChannelSO 提供 Inspector 内的"Raise（测试触发）"按钮。
    /// 仅在 Play Mode 下可用，防止在编辑状态误触发副作用。
    /// </summary>
    [CustomEditor(typeof(VoidBaseEventChannelSO), true)]
    public class VoidEventChannelSOEditor : UnityEditor.Editor
    {
        public override void OnInspectorGUI()
        {
            DrawDefaultInspector();

            EditorGUILayout.Space(6);
            EditorGUI.BeginDisabledGroup(!Application.isPlaying);
            if (GUILayout.Button("▶ Raise（测试触发）", GUILayout.Height(28)))
            {
                var channel = (VoidBaseEventChannelSO)target;
                channel.Raise();
                Debug.Log($"[EventChannelEditor] Raised: {target.name}");
            }
            EditorGUI.EndDisabledGroup();

            if (!Application.isPlaying)
            {
                EditorGUILayout.HelpBox("进入 Play Mode 后可点击 Raise 触发此事件。", MessageType.Info);
            }
        }
    }

    /// <summary>
    /// 为所有 BaseEventChannelSO&lt;T&gt; 子类提供 Inspector 内的订阅者数量显示和说明标签。
    /// 因泛型限制，Raise 按钮由具体类型的派生 Editor 提供（见下方注册器）。
    /// </summary>
    [CustomEditor(typeof(ScriptableObject), true)]
    public class GenericEventChannelSOEditor : UnityEditor.Editor
    {
        // 仅对 BaseEventChannelSO<T> 子类生效
        private bool _isEventChannel;

        private void OnEnable()
        {
            var t = target.GetType();
            while (t != null && t != typeof(object))
            {
                if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(BaseEventChannelSO<>))
                {
                    _isEventChannel = true;
                    break;
                }
                t = t.BaseType;
            }
        }

        public override void OnInspectorGUI()
        {
            if (!_isEventChannel)
            {
                DrawDefaultInspector();
                return;
            }

            DrawDefaultInspector();

            EditorGUILayout.Space(6);
            EditorGUI.BeginDisabledGroup(true);
            if (Application.isPlaying)
            {
                // 反射获取订阅者数量
                var field = target.GetType().GetField("OnEventRaised",
                    System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                if (field != null)
                {
                    var del = field.GetValue(target) as Delegate;
                    int count = del?.GetInvocationList().Length ?? 0;
                    EditorGUILayout.LabelField("当前订阅者数量", count.ToString());
                }
            }
            EditorGUI.EndDisabledGroup();

            if (!Application.isPlaying)
            {
                EditorGUILayout.HelpBox("进入 Play Mode 可查看实时订阅者数量。", MessageType.Info);
            }
        }
    }
}