using UnityEngine;
using BaseGames.Core.Events;
using BaseGames.Player;

namespace BaseGames.Quest
{
    /// <summary>
    /// 任务事件类型枚举，对应 QuestManager 订阅的各事件频道。
    /// 新增事件类型时在此扩展，无需修改 QuestManager。
    /// </summary>
    public enum QuestEventType
    {
        EnemyDefeated,
        ItemCollected,
        NpcDialogueCompleted,
        SceneLoaded,
        SkillUsed,
        /// <summary>
        /// 玩家进入场景内的具体区域标记（由 TriggerZone 广播）。
        /// payload = TriggerZone.markerTag（string）。
        /// 与 SceneLoaded（场景级）互补，实现精确的区域到达判定。
        /// </summary>
        AreaReached,
    }

    /// <summary>
    /// 任务目标基类（抽象，架构 22_QuestChallengeModule §3）。
    /// 所有具体目标类型均继承此类，通过多态实现零代码扩展。
    ///
    /// 【自注册机制】子类通过 override <see cref="TryHandleEvent"/> 声明自己
    /// 感兴趣的事件类型及匹配条件，QuestManager 统一路由，无需为每种目标类型
    /// 硬编码处理器。新增目标类型只需：
    ///   1. 继承 QuestObjectiveSO
    ///   2. override TryHandleEvent
    ///   3. override EvaluateCompletion
    ///   4. 创建 CreateAssetMenu
    /// QuestManager 代码**无需任何修改**。
    /// </summary>
    public abstract class QuestObjectiveSO : ScriptableObject
    {
        [Header("标识")]
        [Tooltip("目标唯一 ID，如 \"OBJ_TalkElder\"。空时由 OnValidate 自动以资产名填充。")]
        public string objectiveId;
        [Tooltip("本地化 Key，格式如 \"Quest_FindMushroom_Obj1\"。通过 LocalizationManager.Get(displayTextKey, \"Quest\") 显示给玩家。")]
        [TextArea(1, 4)]
        public string displayTextKey;
        [Tooltip("勾选后此目标为可选项：完成可获奖励，但不阻塞任务交接。")]
        public bool   IsOptional;

        /// <summary>
        /// 目标所需完成数量。用于 UI 显示进度条分母（如 "3/5 击败"）。
        /// 子类应 override 返回相应计数字段（defeatCount、collectCount 等）。
        /// 默认返回 1（表示"完成一次即可"的目标类型）。
        /// </summary>
        public virtual int GetRequiredCount() => 1;

        /// <summary>根据当前进度判断目标是否完成。</summary>
        public abstract bool EvaluateCompletion(QuestObjectiveState state);

        /// <summary>
        /// 尝试处理一个运行时事件。
        /// QuestManager 在每次事件到来时对所有活跃目标调用此方法。
        /// 子类 override：若事件与自身条件匹配，递增 state.progressCount 并返回 true；
        /// 不匹配时返回 false（基类默认实现）。
        ///
        /// <para>参数 <paramref name="payload"/> 含义由事件类型决定：</para>
        /// <list type="bullet">
        ///   <item>EnemyDefeated      → enemyId (string)</item>
        ///   <item>ItemCollected      → itemId (string)</item>
        ///   <item>NpcDialogueCompleted → npcId (string)</item>
        ///   <item>SceneLoaded        → sceneName (string)</item>
        ///   <item>SkillUsed          → AbilityType.ToString() (string)</item>
        /// </list>
        /// </summary>
        public virtual bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
            => false;

        /// <summary>
        /// 在 DataHub / 编辑器工具中显示的类型徽章文字。
        /// 子类应 override 返回简洁中文标签（如 "[对话]"）。
        /// 避免工具代码中使用 type-switch 维护列表。
        /// </summary>
        public virtual string BadgeLabel => "[目标]";

#if UNITY_EDITOR
        // objectiveId → 资产路径，5 秒 TTL，跨所有 QuestObjectiveSO 子类 OnValidate 共用。
        // 与 QuestSO / DialogueSequenceSO / DialogueActorSO 保持一致的 O(1) 重复检测策略。
        private static System.Collections.Generic.Dictionary<string, string> s_objIdToPath;
        private static double s_objIdsCacheTime = -10.0;

        private static System.Collections.Generic.Dictionary<string, string> GetObjectiveIdCache()
        {
            double now = UnityEditor.EditorApplication.timeSinceStartup;
            if (s_objIdToPath != null && now - s_objIdsCacheTime < 5.0)
                return s_objIdToPath;

            s_objIdToPath = new System.Collections.Generic.Dictionary<string, string>(System.StringComparer.Ordinal);
            string[] guids = UnityEditor.AssetDatabase.FindAssets("t:QuestObjectiveSO");
            foreach (var guid in guids)
            {
                var path = UnityEditor.AssetDatabase.GUIDToAssetPath(guid);
                var obj  = UnityEditor.AssetDatabase.LoadAssetAtPath<QuestObjectiveSO>(path);
                if (obj != null && !string.IsNullOrEmpty(obj.objectiveId) && !s_objIdToPath.ContainsKey(obj.objectiveId))
                    s_objIdToPath[obj.objectiveId] = path;
            }
            s_objIdsCacheTime = now;
            return s_objIdToPath;
        }

        private void OnValidate()
        {
            // 若 objectiveId 为空，自动以资产文件名填充
            if (string.IsNullOrEmpty(objectiveId))
            {
                objectiveId = name;
                UnityEditor.EditorUtility.SetDirty(this);
            }

            // 检测重复：缓存路径 vs 自身路径比对（O(1)），5 秒内无需重扫
            var    cache  = GetObjectiveIdCache();
            string myPath = UnityEditor.AssetDatabase.GetAssetPath(this);
            if (!string.IsNullOrEmpty(myPath) &&
                cache.TryGetValue(objectiveId, out var existingPath) &&
                existingPath != myPath)
            {
                Debug.LogError(
                    $"[QuestObjectiveSO] objectiveId '{objectiveId}' 与 " +
                    $"'{System.IO.Path.GetFileNameWithoutExtension(existingPath)}' 重复！" +
                    "重复 ID 会导致任务进度互相覆盖，请修改其中一个。", this);
                s_objIdsCacheTime = -10.0;
            }
        }
#endif
    }

    // ── 运行时目标进度状态（由 QuestManager 管理，不继承 SO）────────────────

    public class QuestObjectiveState
    {
        public bool completed     = false;
        public int  progressCount = 0;
    }

    // ── 具体目标类型 ────────────────────────────────────────────────────────

    /// <summary>与指定 NPC 对话后完成。</summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Objective/TalkToNPC")]
    public class TalkToNPCObjective : QuestObjectiveSO
    {
        [Tooltip("目标 NPC 的唯一 ID，需与 NPC 组件上的 npcId / InteractableNPC.npcId 保持一致。")]
        public string targetNpcId;
        public override string BadgeLabel => "[对话]";
        public override bool EvaluateCompletion(QuestObjectiveState s) => s.progressCount >= 1;

        public override bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
        {
            if (eventType != QuestEventType.NpcDialogueCompleted) return false;
            if (payload != targetNpcId) return false;
            state.progressCount++;
            return true;
        }
    }

    /// <summary>击败指定 ID 的敌人若干次。</summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Objective/Defeat")]
    public class DefeatEnemyObjective : QuestObjectiveSO
    {
        [Tooltip("目标敌人的唯一 ID，需与敌人 SO 或敌人组件上的 enemyId 保持一致。")]
        public string targetEnemyId;
        [Tooltip("需击败的次数，默认 1。")]
        [Min(1)] public int defeatCount = 1;
        public override string BadgeLabel => "[击败]";
        public override int GetRequiredCount() => defeatCount;
        public override bool EvaluateCompletion(QuestObjectiveState s) => s.progressCount >= defeatCount;

        public override bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
        {
            if (eventType != QuestEventType.EnemyDefeated) return false;
            if (payload != targetEnemyId) return false;
            state.progressCount++;
            return true;
        }
    }

    /// <summary>收集指定 ID 的物品若干件。</summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Objective/Collect")]
    public class CollectItemObjective : QuestObjectiveSO
    {
        [Tooltip("目标物品的唯一 ID，需与拾取事件广播的 itemId 保持一致。")]
        public string itemId;
        [Tooltip("需收集的数量，默认 1。")]
        [Min(1)] public int collectCount = 1;
        public override string BadgeLabel => "[收集]";
        public override int GetRequiredCount() => collectCount;
        public override bool EvaluateCompletion(QuestObjectiveState s) => s.progressCount >= collectCount;

        public override bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
        {
            if (eventType != QuestEventType.ItemCollected) return false;
            if (payload != itemId) return false;
            state.progressCount++;
            return true;
        }
    }

    /// <summary>到达指定场景/区域标记点后完成。</summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Objective/Reach")]
    public class ReachAreaObjective : QuestObjectiveSO
    {
        [Tooltip("需到达的场景名（Unity Build Settings 中的场景名称）。留空时仅依赖 markerTag 判定。")]
        public string sceneName;
        [Tooltip("场景内的区域标记 Tag（与 TriggerZone.markerTag 保持一致）。\n" +
                 "非空时：玩家进入挂有对应 markerTag 的 TriggerZone 碰撞体即触发。\n" +
                 "留空时：整个场景切换即触发（粗粒度，仅检查 sceneName）。")]
        public string markerTag;
        public override string BadgeLabel => "[到达]";
        public override bool EvaluateCompletion(QuestObjectiveState s) => s.progressCount >= 1;

        public override bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
        {
            // 精确区域到达：TriggerZone 广播 AreaReached，payload = markerTag
            if (eventType == QuestEventType.AreaReached &&
                !string.IsNullOrEmpty(markerTag) &&
                payload == markerTag)
            {
                state.progressCount++;
                return true;
            }

            // 场景级到达：payload = sceneName，仅当 markerTag 为空时生效（否则等待精确触发）
            if (eventType == QuestEventType.SceneLoaded &&
                !string.IsNullOrEmpty(sceneName) &&
                payload == sceneName &&
                string.IsNullOrEmpty(markerTag))
            {
                state.progressCount++;
                return true;
            }

            return false;
        }
    }

    /// <summary>使用指定能力若干次后完成。</summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Objective/UseSkill")]
    public class UseSkillObjective : QuestObjectiveSO
    {
        [Tooltip("目标能力类型。事件频道 EVT_SkillUsed 广播 AbilityType.ToString()，与此值匹配时计数。")]
        public AbilityType requiredAbility;
        [Tooltip("需使用的次数，默认 1。")]
        [Min(1)] public int useCount = 1;
        public override string BadgeLabel => "[使用]";
        public override int GetRequiredCount() => useCount;
        public override bool EvaluateCompletion(QuestObjectiveState s) => s.progressCount >= useCount;

        public override bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
        {
            if (eventType != QuestEventType.SkillUsed) return false;
            // Enum.TryParse 避免大小写/格式差异导致静默失败
            if (!System.Enum.TryParse<AbilityType>(payload, ignoreCase: true, out var parsed)) return false;
            if (parsed != requiredAbility) return false;
            state.progressCount++;
            return true;
        }
    }

    // ── 扩展事件频道绑定（供 QuestManager Inspector 使用）────────────────────

    /// <summary>
    /// 自定义事件频道与任务事件类型的绑定。
    /// 在 QuestManager Inspector 的"扩展事件频道"数组中添加条目，即可不修改代码
    /// 支持未来新增的 <see cref="QuestEventType"/> 枚举值与 SO 频道的映射。
    /// </summary>
    [System.Serializable]
    public struct QuestEventChannelBinding
    {
        [Tooltip("要监听的事件类型（需与 QuestObjectiveSO 子类中 TryHandleEvent 处理的类型一致）。")]
        public QuestEventType        eventType;
        [Tooltip("该类型对应的 StringEventChannelSO 资产。由广播方（如战斗系统、场景系统）负责 Raise。")]
        public StringEventChannelSO  channel;
    }
}