using System.Collections.Generic;
using Continentis.MainGame.Character;
using Continentis.MainGame.Saving;
using SLSUtilities.General;
using SLSUtilities.UModAssistance;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace Continentis.MainGame
{
    // ── 常量与核心字段 ──────────────────────────────────────────────────────────
    public partial class MainGameManager : Singleton<MainGameManager>
    {
        private const string CombatSceneName = "GameScene";
        private const string MenuSceneName   = "MenuScene";

        public readonly HashSet<string> elementTags = new HashSet<string>()
        {
            "Wind", "Fire", "Ice", "Earth", "Storm", "Light", "Darkness", "Physics"
        };

        public BasePrefabs basePrefabs;
    }

    // ── 游戏数据字段 ────────────────────────────────────────────────────────────
    public partial class MainGameManager
    {
        /// <summary>全关键词合并表，由各 Mod 的 KeywordData 合并而来。</summary>
        public KeywordData keywordData;

        /// <summary>当前跑局的存档快照，既是运行时状态也是持久化来源。null 表示无进行中的跑局。</summary>
        public RunSave currentRun;

        /// <summary>当前战斗的玩家英雄 CharacterData 列表，由 PrepareCombat() 填充。</summary>
        public List<CharacterData> playerHeroDataList = new List<CharacterData>();

        /// <summary>当前战斗的敌方 CharacterData 列表，由 PrepareCombat() 填充。</summary>
        public List<CharacterData> enemyDataList = new List<CharacterData>();
    }

    // ── 初始化 ──────────────────────────────────────────────────────────────────
    public partial class MainGameManager
    {
        protected override void Awake()
        {
            base.Awake();

            // 合并所有 Mod 的 KeywordData 到全局查询表
            keywordData = ScriptableObject.CreateInstance<KeywordData>();
            foreach (KeyValuePair<string, ScriptableObject> pair in ModManager.Database[typeof(KeywordData)])
            {
                KeywordData data = pair.Value as KeywordData;
                foreach (var keyword in data!.interpretedKeywords)
                {
                    keywordData.interpretedKeywords.TryAdd(keyword.Key, keyword.Value);
                }
            }

            // 消费 InformationTransistor 中的主菜单意图
            InfoTransistor transistor = InfoTransistor.Instance;
            if (transistor == null)
            {
                Debug.LogError("[MainGame] InformationTransistor 未找到，无法确定跑局意图。");
                return;
            }

            InfoTransistor.Menu.MenuIntent intent = transistor.menuToMainGame.menuIntent;
            RunConfig config = transistor.menuToMainGame.pendingRunConfig;
            
            Debug.Log($"[MainGame] Awake：收到主菜单意图 {intent}，RunConfig {(config != null ? config.name : "null")}。");
            // 消费后重置，避免场景重新加载时重复执行
            transistor.menuToMainGame.menuIntent = InfoTransistor.Menu.MenuIntent.None;
            transistor.menuToMainGame.pendingRunConfig = null;
            
            switch (intent)
            {
                case InfoTransistor.Menu.MenuIntent.StartNewRun:
                    StartNewRun(config);
                    break;
                case InfoTransistor.Menu.MenuIntent.ContinueRun:
                    ContinueRun();
                    break;
                default:
                    Debug.LogWarning("[MainGame] Awake 时未收到有效的跑局意图，跳过初始化。");
                    break;
            }

        }
    }

    // ── 跑局流程 API ────────────────────────────────────────────────────────────
    public partial class MainGameManager
    {
        /// <summary>
        /// 开始一次新跑局：从 RunConfig 初始化英雄和关卡序列，写入开局存档，准备首场战斗数据。
        /// RunConfig 仅在此处读取一次，结果完整拷贝到 RunSave，后续不再查询它。
        /// 由 Awake 消费 StartNewRun 意图时调用。
        /// </summary>
        private void StartNewRun(RunConfig config)
        {
            currentRun = new RunSave(
                Random.Range(int.MinValue, int.MaxValue),
                config.startingGold,
                new List<string>(config.encounterSequenceIDs)
            );

            foreach (string heroID in config.initialHeroIDs)
            {
                CharacterData data = CharacterData.Get(heroID);
                if (data == null)
                {
                    Debug.LogError($"[MainGame] StartNewRun：找不到角色数据 '{heroID}'，已跳过。");
                    continue;
                }

                int maxHP = Mathf.RoundToInt(data.generalAttributes.TryGetValue("MaximumHealth", out float hp) ? hp : 0f);
                HeroSave hero = new HeroSave(heroID, maxHP, maxHP);

                foreach (string cardID in data.initialDeckRef)
                    hero.deck.Add(new CardSave(cardID));

                currentRun.heroes.Add(hero);
            }

            SaveManager.Instance.SaveRunSave(currentRun);
            Debug.Log($"[MainGame] 新跑局开始（配置：{config.name}，节点数：{currentRun.combatNodeIDs.Count}，种子：{currentRun.randomSeed}）");

            PrepareCombat(currentRun.currentNodeIndex);
        }

        /// <summary>
        /// 从 SaveManager 缓存恢复跑局并准备当前节点的战斗数据。
        /// 由 Awake 消费 ContinueRun 意图时调用。
        /// </summary>
        private void ContinueRun()
        {
            currentRun = SaveManager.Instance.GetRunSave();
            if (currentRun == null)
            {
                Debug.LogError("[MainGame] ContinueRun：SaveManager 缓存中无进行中的跑局。");
                return;
            }

            Debug.Log($"[MainGame] 继续跑局（节点 {currentRun.currentNodeIndex} / {currentRun.combatNodeIDs.Count}）");
            PrepareCombat(currentRun.currentNodeIndex);
        }

        /// <summary>
        /// 根据节点索引填充玩家英雄和敌方角色列表。
        /// 仅准备运行时数据供 CombatMainManager 使用，不涉及场景加载。
        /// </summary>
        private void PrepareCombat(int nodeIndex)
        {
            if (nodeIndex >= currentRun.combatNodeIDs.Count)
            {
                Debug.Log("[MainGame] 所有关卡已通关，跑局结束！");
                // TODO: Phase 4 — 显示通关结算界面
                return;
            }

            // 填充玩家英雄列表
            playerHeroDataList.Clear();
            foreach (HeroSave hero in currentRun.heroes)
            {
                CharacterData data = CharacterData.Get(hero.characterDataID);
                if (data != null)
                    playerHeroDataList.Add(data);
                else
                    Debug.LogError($"[MainGame] PrepareCombat：找不到角色数据 '{hero.characterDataID}'。");
            }

            // 填充敌方列表
            string nodeID = currentRun.combatNodeIDs[nodeIndex];
            CombatNodeData nodeData = CombatNodeData.Get(nodeID);
            if (nodeData == null)
            {
                Debug.LogError($"[MainGame] PrepareCombat：找不到 CombatNodeData '{nodeID}'。");
                return;
            }

            enemyDataList.Clear();
            foreach (string enemyID in nodeData.enemyCharacterIDs)
            {
                CharacterData data = CharacterData.Get(enemyID);
                if (data != null)
                    enemyDataList.Add(data);
                else
                    Debug.LogError($"[MainGame] PrepareCombat：找不到敌方角色数据 '{enemyID}'。");
            }
        }

        /// <summary>
        /// 战斗结束回调，由 CombatMainManager 调用。
        /// 胜利时回写 HP、推进节点并存档，然后通过 InfoTransistor 写入 ContinueRun 意图并重载场景。
        /// 失败时清除跑局存档（保留 PlayerSave）并返回主菜单。
        /// 注意：MainGameManager 是场景局部单例，重载场景后当前实例会被销毁，
        /// 新实例的 Awake 会从 InfoTransistor 消费意图并重新初始化。
        /// </summary>
        public void ExitCombat(bool isVictory, IReadOnlyList<(string heroID, int currentHP)> heroResults = null)
        {
            if (isVictory)
            {
                if (heroResults != null)
                {
                    foreach (var (heroID, hp) in heroResults)
                    {
                        HeroSave hero = currentRun.heroes.Find(h => h.characterDataID == heroID);
                        if (hero != null)
                            hero.currentHP = hp;
                    }
                }

                currentRun.currentNodeIndex++;
                SaveManager.Instance.SaveRunSave(currentRun);
                Debug.Log($"[MainGame] 战斗胜利，节点推进至 {currentRun.currentNodeIndex}，存档已写入。");

                // 检查是否所有节点已通关
                if (currentRun.currentNodeIndex >= currentRun.combatNodeIDs.Count)
                {
                    Debug.Log("[MainGame] 所有关卡已通关，跑局结束！");
                    // TODO: Phase 4 — 显示通关结算界面，之后返回主菜单
                    return;
                }

                // 写入 ContinueRun 意图，重载场景以启动下一场战斗
                // TODO: Phase 4 — 先进入奖励选择界面，完成后再走此流程
                InfoTransistor transistor = InfoTransistor.Instance;
                transistor.menuToMainGame.menuIntent       = InfoTransistor.Menu.MenuIntent.ContinueRun;
                transistor.menuToMainGame.pendingRunConfig = null;
                SceneManager.LoadScene(CombatSceneName);
            }
            else
            {
                SaveManager.Instance.DeleteRunSave();
                Debug.Log("[MainGame] 战斗失败，跑局存档已清除（PlayerSave 保留），返回主菜单。");
                SceneManager.LoadScene(MenuSceneName);
            }
        }
    }

    // ── 静态工具方法 ────────────────────────────────────────────────────────────
    public partial class MainGameManager
    {
        public static void GenerateInfoText(string content, CombatCharacterViewBase characterView, Color color = default, float size = 1)
            => Instance.basePrefabs.GenerateInfoText(content, characterView, color, size);
    }
}