using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;
using BaseGames.EventChain;

namespace BaseGames.Editor
{
    /// <summary>
    /// 事件链可视化编辑器窗口（架构 14_NarrativeModule §13）。
    /// 菜单：BaseGames/Tools/Event Chain Viewer
    ///
    /// 功能：
    /// - 左侧：chainId 分组总览（按完成状态着色）
    /// - 右侧：选中链的 Conditions 和 Actions 表格
    /// - Play Mode：运行时状态着色（已完成=绿 / 条件满足=橙 / 未满足=白）
    /// - ChainCompletedCondition 依赖链箭头指示
    /// - 执行日志（最近 20 条）
    /// - 双击 → EditorGUIUtility.PingObject
    /// </summary>
    public class EventChainEditorWindow : EditorWindow
    {
        // ── State ──────────────────────────────────────────────────────────
        private EventChainSO[]  _allChains;
        private EventChainSO    _selectedChain;
        private Vector2         _leftScroll;
        private Vector2         _rightScroll;
        private Vector2         _logScroll;

        private static readonly List<string> _log = new();
        private const int MaxLogEntries = 20;

        // ── Colors ─────────────────────────────────────────────────────────
        private static readonly Color ColCompleted = new Color(0.15f, 0.75f, 0.25f, 0.80f);
        private static readonly Color ColActive    = new Color(0.95f, 0.60f, 0.10f, 0.80f);
        private static readonly Color ColPending   = new Color(0.70f, 0.70f, 0.75f, 0.80f);

        [MenuItem("BaseGames/Tools/Event Chain Viewer")]
        public static void OpenWindow()
        {
            var win = GetWindow<EventChainEditorWindow>("Event Chain Viewer");
            win.minSize = new Vector2(800, 500);
            win.Show();
        }

        /// <summary>外部调用：向执行日志追加一条记录（可在运行时由 EventChainManager 调用）。</summary>
        public static void LogExecution(string chainId, string message)
        {
            _log.Add($"[{System.DateTime.Now:HH:mm:ss}] [{chainId}] {message}");
            if (_log.Count > MaxLogEntries)
                _log.RemoveAt(0);
        }

        // ── Lifecycle ─────────────────────────────────────────────────────

        private void OnEnable()
        {
            RefreshChainList();
            EditorApplication.playModeStateChanged += OnPlayModeChanged;
            EventChainManager.OnChainExecutedInEditor += LogExecution;
        }

        private void OnDisable()
        {
            EditorApplication.playModeStateChanged -= OnPlayModeChanged;
            EventChainManager.OnChainExecutedInEditor -= LogExecution;
        }

        private void OnPlayModeChanged(PlayModeStateChange state)
        {
            if (state == PlayModeStateChange.EnteredPlayMode
             || state == PlayModeStateChange.ExitingPlayMode)
            {
                RefreshChainList();
                Repaint();
            }
        }

        private void RefreshChainList()
        {
            var guids = AssetDatabase.FindAssets("t:EventChainSO");
            var chains = new List<EventChainSO>(guids.Length);
            foreach (var g in guids)
            {
                var path = AssetDatabase.GUIDToAssetPath(g);
                var chain = AssetDatabase.LoadAssetAtPath<EventChainSO>(path);
                if (chain != null) chains.Add(chain);
            }
            _allChains = chains.OrderBy(c => c.chainId).ToArray();
        }

        // ── GUI ────────────────────────────────────────────────────────────

        private void OnGUI()
        {
            DrawToolbar();

            EditorGUILayout.BeginHorizontal();

            // 左：链列表
            EditorGUILayout.BeginVertical(GUILayout.Width(240));
            DrawChainList();
            EditorGUILayout.EndVertical();

            // 分割线
            EditorGUILayout.BeginVertical(GUILayout.Width(2));
            EditorGUI.DrawRect(GUILayoutUtility.GetRect(2, position.height), new Color(0.1f, 0.1f, 0.1f));
            EditorGUILayout.EndVertical();

            // 右：选中链详情
            EditorGUILayout.BeginVertical();
            if (_selectedChain != null)
                DrawChainDetail(_selectedChain);
            else
                EditorGUILayout.HelpBox("从左侧选择一条事件链查看详情。", MessageType.None);
            EditorGUILayout.EndVertical();

            EditorGUILayout.EndHorizontal();
        }

        // ── Toolbar ───────────────────────────────────────────────────────

        private void DrawToolbar()
        {
            EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
            if (GUILayout.Button("刷新", EditorStyles.toolbarButton, GUILayout.Width(50)))
                RefreshChainList();
            GUILayout.FlexibleSpace();
            EditorGUILayout.LabelField(
                $"共 {_allChains?.Length ?? 0} 条事件链",
                EditorStyles.toolbarButton);
            EditorGUILayout.EndHorizontal();
        }

        // ── 左侧链列表 ────────────────────────────────────────────────────

        private void DrawChainList()
        {
            EditorGUILayout.LabelField("事件链列表", EditorStyles.boldLabel);
            _leftScroll = EditorGUILayout.BeginScrollView(_leftScroll);

            if (_allChains == null || _allChains.Length == 0)
            {
                EditorGUILayout.HelpBox("未找到 EventChainSO 资产。", MessageType.Info);
                EditorGUILayout.EndScrollView();
                return;
            }

            foreach (var chain in _allChains)
            {
                if (chain == null) continue;

                bool isSelected   = _selectedChain == chain;
                bool isCompleted  = IsChainCompleted(chain);
                bool isActive     = Application.isPlaying && IsChainActive(chain);

                Color bgColor = isCompleted ? ColCompleted : isActive ? ColActive : ColPending;
                var prevBg = GUI.backgroundColor;
                GUI.backgroundColor = isSelected ? bgColor * 1.4f : bgColor * 0.7f;

                EditorGUILayout.BeginHorizontal("box");

                // 状态图标
                string icon = isCompleted ? "✓" : isActive ? "▶" : "○";
                EditorGUILayout.LabelField(icon, GUILayout.Width(16));

                if (GUILayout.Button(chain.chainId, isSelected ? EditorStyles.boldLabel : EditorStyles.label))
                    _selectedChain = chain;

                // 双击 Ping
                if (Event.current.type == EventType.MouseDown && Event.current.clickCount == 2
                    && GUILayoutUtility.GetLastRect().Contains(Event.current.mousePosition))
                {
                    EditorGUIUtility.PingObject(chain);
                    Event.current.Use();
                }

                EditorGUILayout.EndHorizontal();
                GUI.backgroundColor = prevBg;
            }

            EditorGUILayout.EndScrollView();
        }

        // ── 右侧详情 ──────────────────────────────────────────────────────

        private void DrawChainDetail(EventChainSO chain)
        {
            _rightScroll = EditorGUILayout.BeginScrollView(_rightScroll);

            // 标题行
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField(
                $"事件链：{chain.chainId}",
                EditorStyles.boldLabel);
            if (GUILayout.Button("↗ Ping", GUILayout.Width(60)))
                EditorGUIUtility.PingObject(chain);
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.LabelField(
                $"可重复：{(chain.repeatable ? "是" : "否")}  |  " +
                $"动作间隔：{chain.actionDelay:F2}s",
                EditorStyles.miniLabel);

            EditorGUILayout.Space(6);

            // Conditions 表格
            EditorGUILayout.LabelField("触发条件（全部满足才触发）", EditorStyles.boldLabel);
            if (chain.conditions != null && chain.conditions.Length > 0)
            {
                foreach (var cond in chain.conditions)
                {
                    if (cond == null) continue;

                    bool met = Application.isPlaying && cond.IsMet();
                    var prevBg = GUI.backgroundColor;
                    GUI.backgroundColor = met ? ColCompleted * 0.8f : new Color(0.9f, 0.9f, 0.9f, 0.3f);

                    EditorGUILayout.BeginHorizontal("box");
                    string status = Application.isPlaying ? (met ? "✓" : "✗") : "—";
                    EditorGUILayout.LabelField(status, GUILayout.Width(20));
                    EditorGUILayout.LabelField(cond.GetType().Name, GUILayout.Width(220));

                    // 依赖箭头：ChainCompletedCondition
                    if (cond is ChainCompletedCondition depCond)
                    {
                        EditorGUILayout.LabelField($"→ 依赖链：{depCond.chainId}",
                            EditorStyles.miniLabel);
                    }

                    if (GUILayout.Button("↗", GUILayout.Width(24)))
                        EditorGUIUtility.PingObject(cond);
                    EditorGUILayout.EndHorizontal();
                    GUI.backgroundColor = prevBg;
                }
            }
            else
            {
                EditorGUILayout.LabelField("（无条件，立即触发）", EditorStyles.miniLabel);
            }

            EditorGUILayout.Space(6);

            // Actions 表格
            EditorGUILayout.LabelField("执行动作（顺序执行）", EditorStyles.boldLabel);
            if (chain.actions != null && chain.actions.Length > 0)
            {
                for (int i = 0; i < chain.actions.Length; i++)
                {
                    var action = chain.actions[i];
                    if (action == null) continue;

                    EditorGUILayout.BeginHorizontal("box");
                    EditorGUILayout.LabelField($"[{i}]", GUILayout.Width(30));
                    EditorGUILayout.LabelField(action.GetType().Name, GUILayout.Width(200));
                    EditorGUILayout.LabelField(action.name, EditorStyles.miniLabel);
                    if (GUILayout.Button("↗", GUILayout.Width(24)))
                        EditorGUIUtility.PingObject(action);
                    EditorGUILayout.EndHorizontal();
                }
            }
            else
            {
                EditorGUILayout.LabelField("（无动作）", EditorStyles.miniLabel);
            }

            // 执行日志
            EditorGUILayout.Space(6);
            EditorGUILayout.LabelField($"执行日志（最近 {MaxLogEntries} 条）", EditorStyles.boldLabel);
            _logScroll = EditorGUILayout.BeginScrollView(_logScroll, GUILayout.Height(120));
            var relevantLogs = _log.Where(l => l.Contains(chain.chainId)).ToList();
            if (relevantLogs.Count == 0)
                EditorGUILayout.LabelField("—（无日志）", EditorStyles.miniLabel);
            else
                foreach (var entry in relevantLogs)
                    EditorGUILayout.LabelField(entry, EditorStyles.miniLabel);
            EditorGUILayout.EndScrollView();

            EditorGUILayout.EndScrollView();
        }

        // ── 运行时状态查询 ────────────────────────────────────────────────

        private static bool IsChainCompleted(EventChainSO chain)
        {
            if (!Application.isPlaying) return false;
            var manager = FindFirstObjectByType<EventChainManager>();
            if (manager == null) return false;
            // 通过反射读取 _completedChains
            var field = typeof(EventChainManager).GetField(
                "_completedChains",
                System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
            if (field?.GetValue(manager) is HashSet<string> completed)
                return completed.Contains(chain.chainId);
            return false;
        }

        private static bool IsChainActive(EventChainSO chain)
        {
            // 链"激活中"= 有任意条件已满足但链未完成
            if (chain.conditions == null) return false;
            return chain.conditions.Any(c => c != null && c.IsMet());
        }

        private void Update()
        {
            // Play Mode 下每秒刷新一次以更新状态颜色
            if (Application.isPlaying)
                Repaint();
        }
    }
}