using UnityEngine;
using BaseGames.Core;
using BaseGames.Dialogue;
using BaseGames.Player;
using QuestStateEnum = BaseGames.Core.Events.QuestState;
using SL = BaseGames.Core.ServiceLocator;

namespace BaseGames.Quest
{
    /// <summary>
    /// 可发布/完成任务的 NPC（架构 22_QuestChallengeModule §6）。
    /// 继承 InteractableNPC，根据任务状态切换对话版本，在交互时处理任务接收/完成。
    /// </summary>
    public class QuestGiver : InteractableNPC
    {
        [Header("任务")]
        [SerializeField] private QuestSO[] _offeredQuests;   // 该 NPC 可提供的所有任务（按优先级排列）

        [Header("对话版本（根据任务状态切换）")]
        [SerializeField] private DialogueSequenceSO _availableDialogue;   // 任务可接时
        [SerializeField] private DialogueSequenceSO _activeDialogue;      // 任务进行中
        [SerializeField] private DialogueSequenceSO _readyDialogue;       // 完成条件满足时
        [SerializeField] private DialogueSequenceSO _completedDialogue;   // 任务已完成后

        // ── InteractableNPC 覆盖 ──────────────────────────────────────────────

        protected override void Interact_Internal(Transform player)
        {
            var qm    = SL.GetOrDefault<IQuestManager>();
            var quest = GetCurrentQuest(qm);
            if (quest == null || qm == null) return;

            var state = qm.GetState(quest.questId);

            if (state == QuestStateEnum.Available)
            {
                qm.AcceptQuest(quest.questId);
            }
            else if (qm.IsReadyToComplete(quest.questId))
            {
                // 直接从 player 获取 PlayerStats，避免对 PlayerController 的程序集依赖
                var stats = player.GetComponentInParent<PlayerStats>();
                qm.CompleteQuest(quest.questId, stats);
            }
        }

        protected override DialogueSequenceSO GetCurrentDialogue()
        {
            var qm    = SL.GetOrDefault<IQuestManager>();
            var quest = GetCurrentQuest(qm);
            if (quest == null || qm == null) return base.GetCurrentDialogue();

            var state = qm.GetState(quest.questId);

            return state switch
            {
                QuestStateEnum.Available => _availableDialogue,
                QuestStateEnum.Active    => qm.IsReadyToComplete(quest.questId)
                                               ? _readyDialogue : _activeDialogue,
                QuestStateEnum.Completed => _completedDialogue,
                _                        => base.GetCurrentDialogue(),
            };
        }

        // ── 私有辅助 ─────────────────────────────────────────────────────────

        /// <summary>返回当前处于 Available 或 Active 状态的第一个任务。</summary>
        private QuestSO GetCurrentQuest(IQuestManager qm = null)
        {
            if (_offeredQuests == null) return null;
            qm ??= SL.GetOrDefault<IQuestManager>();
            if (qm == null) return null;
            foreach (var q in _offeredQuests)
            {
                if (q == null) continue;
                var s = qm.GetState(q.questId);
                if (s == QuestStateEnum.Available || s == QuestStateEnum.Active) return q;
            }
            return null;
        }
    }
}