using System;
using UnityEngine;
using BaseGames.Dialogue;

namespace BaseGames.Quest
{
    /// <summary>
    /// 任务定义 SO（架构 22_QuestChallengeModule §2）。
    /// 资产路径: Assets/ScriptableObjects/Quest/Quest_{questId}.asset
    /// </summary>
    [CreateAssetMenu(menuName = "BaseGames/Quest/Quest")]
    public class QuestSO : ScriptableObject
    {
        [Header("标识")]
        public string questId;          // 唯一 ID，如 "Quest_FindMushroom"

        [Tooltip("本地化 Key，格式如 \"Quest_FindMushroom_Name\"。通过 LocalizationManager.Get(displayNameKey, \"Quest\") 显示。")]
        public string displayNameKey;
        [Tooltip("本地化 Key，格式如 \"Quest_FindMushroom_Desc\"。通过 LocalizationManager.Get(descriptionKey, \"Quest\") 显示。")]
        public string descriptionKey;
        public Sprite icon;

        [Header("目标链")]
        public QuestObjectiveSO[] objectives;   // 按顺序完成，全部完成 = 可交完

        [Header("前置条件")]
        public QuestSO[] prerequisiteQuests;    // 所有前置任务 Completed 后才可接
        public int       minAffinityToAccept;   // NPC 好感度门槛（0 = 无限制）

        [Header("奖励")]
        public RewardSO reward;

        [Header("失败条件（可选）")]
        public bool               canFail;
        public QuestObjectiveSO   failCondition;

        [Header("完成后续任务（分支）")]
        public QuestBranch[] branches;

        // ── 编辑器校验 ────────────────────────────────────────────────────────
#if UNITY_EDITOR
        // questId → 资产路径，5 秒 TTL，跨所有 QuestSO.OnValidate 共用。
        // 重复检测时只需将缓存路径与自身路径比对（O(1)），无需全量扫描。
        private static System.Collections.Generic.Dictionary<string, string> s_questIdToPath;
        private static double s_questIdsCacheTime = -10.0;

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

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

        private void OnValidate()
        {
            if (string.IsNullOrWhiteSpace(questId))
            {
                Debug.LogWarning($"[QuestSO] '{name}' 缺少 questId，保存前请填写。", this);
                return;
            }

            // 检测重复 questId：缓存路径 vs 自身路径比对（O(1)），5 秒内无需重扫。
            var    cache  = GetQuestIdCache();
            string myPath = UnityEditor.AssetDatabase.GetAssetPath(this);
            if (!string.IsNullOrEmpty(myPath) &&
                cache.TryGetValue(questId, out var existingPath) &&
                existingPath != myPath)
            {
                Debug.LogError(
                    $"[QuestSO] questId '{questId}' 与 " +
                    $"'{System.IO.Path.GetFileNameWithoutExtension(existingPath)}' 重复！请修改其中一个。", this);
                s_questIdsCacheTime = -10.0;
            }

            ValidateBranchDialogueKeys();
        }

        private void ValidateBranchDialogueKeys()
        {
            if (branches == null || branches.Length == 0) return;

            foreach (var branch in branches)
            {
                if (branch == null) continue;

                // npcDialogueSequence 是 SO 直接引用，无需字符串校验。
                // 旧字段 npcDialogueKey（Obsolete）有值时提示迁移。
#pragma warning disable CS0618
                if (!string.IsNullOrEmpty(branch.npcDialogueKey) && branch.npcDialogueSequence == null)
                {
                    Debug.LogWarning(
                        $"[QuestSO] '{name}' 分支仍使用旧字段 npcDialogueKey='{branch.npcDialogueKey}'，" +
                        "请迁移至 npcDialogueSequence（直接拖入 DialogueSequenceSO）。", this);
                }
#pragma warning restore CS0618
            }
        }
#endif
    }

    [Serializable]
    public class QuestBranch
    {
        /// <summary>若此前置任务已完成 → 走本分支（null = 默认分支）。</summary>
        public QuestSO            conditionQuest;
        public QuestSO            nextQuest;
        /// <summary>完成后触发的 NPC 对话序列（直接引用，避免手写 sequenceId 字符串出错）。</summary>
        public DialogueSequenceSO npcDialogueSequence;

        [System.Obsolete("已废弃，请改用 npcDialogueSequence（直接 SO 引用）。保留字段以兼容现有资产序列化。")]
        [HideInInspector]
        public string npcDialogueKey;
    }
}