using System.Collections.Generic;
using System.Linq;
using UnityEngine;

// SkillBase（Death 部分）：死亡包、HP 刷新、掉落、经验的收集与分配。
public partial class SkillBase
{
    // 处理HP刷新包（简化逻辑）
    private void HandleRefreshHP()
    {
        // 查找HP刷新包
        HB419_tagSCObjHPRefresh refreshPack = BattleUtility.FindObjHPRefreshPack(packList);

        if (refreshPack != null)
        {
            // 分发HP刷新包
            // 【使用 parentRecordAction.innerRecordPlayer】
            // 原因：HP刷新包是技能内部产生的，应该由当前SkillRecordAction的innerRecordPlayer管理
            // 这样可以确保HP刷新与技能的生命周期绑定，ForceFinish时一并处理
            PackageRegeditEx.DistributeToRecordAction(refreshPack, ownRecordAction);
            packList.Remove(refreshPack);
        }
    }

    // 处理死亡相关逻辑：分配掉落和经验
    protected void HandleDead()
    {
        List<BattleDeadPack> deadPackList = BattleUtility.FindDeadPack(packList);
        if (deadPackList.Count <= 0) return;

        foreach (var deadPack in deadPackList)
        {
            packList.Remove(deadPack.deadPack);
            packList.Remove(deadPack.deadTriggerSkill);
        }

        // 找到最大的死亡包 packUID
        BattleDeadPack lastBattleDeadPack = null;
        ulong maxDeathPackUID = 0;
        foreach (var deadPack in deadPackList)
        {
            if (deadPack.deadPack != null && deadPack.deadPack.packUID > maxDeathPackUID)
            {
                maxDeathPackUID = deadPack.deadPack.packUID;
                lastBattleDeadPack = deadPack;
            }
        }

        // 如果找到了死亡包，收集所有 packUID > maxDeathPackUID 的包
        if (maxDeathPackUID > 0 && lastBattleDeadPack != null)
        {
            BattleDebug.LogError($"SkillBase.HandleDead: 找到死亡包，maxDeathPackUID = {maxDeathPackUID}，开始收集死亡后的包");

            // 1. 收集 packList 中 packUID 大于死亡包的包（排除经验包和掉落包，它们需要在当前技能中处理）
            List<GameNetPackBasic> packsToRemove = new List<GameNetPackBasic>();
            foreach (var pack in packList)
            {
                ulong packUID = GetPackUID(pack);
                if (packUID > maxDeathPackUID)
                {
                    // 排除经验包和掉落包，它们属于当前死亡事件的一部分，不是"死亡后"的包
                    if (pack is HB405_tagMCAddExp expPack && expPack.Source == 2 ||
                        (pack is H0704_tagRolePackRefresh h0704 && h0704.PackType == (byte)PackType.DropItem && h0704.IsBind == 1))
                    {
                        continue; // 跳过经验包和掉落包，让 CheckAfterDeadhPack() 处理它们
                    }

                    BattleDebug.LogError($"SkillBase.HandleDead: 从packList收集死亡后的包 - Type: {pack.GetType().Name}, UID: {packUID}");
                    lastBattleDeadPack.packListAfterDeath.Add(pack);
                    packsToRemove.Add(pack);
                }
            }

            packList.RemoveAll(p => packsToRemove.Contains(p));
        }

        CheckAfterDeadhPack();

        // 修复：先收集要删除的包，避免在foreach中修改集合
        var dropPacksToRemove = new List<H0704_tagRolePackRefresh>(dropPackList);
        foreach (var _dropPack in dropPacksToRemove)
        {
            // 【使用 parentRecordAction.innerRecordPlayer】
            // 原因：掉落包是技能效果的一部分，应该由当前SkillRecordAction管理
            // 掉落包的分发与技能完成绑定，确保在技能ForceFinish时正确处理
            PackageRegeditEx.DistributeToRecordAction(_dropPack, ownRecordAction);
            packList.Remove(_dropPack);
        }

        // 获取并分配掉落物品和经验
        var dropPack = PackManager.Instance.GetSinglePack(PackType.DropItem);
        var itemDict = dropPack.GetAllItems();
        List<ItemModel> itemList = new List<ItemModel>(itemDict.Values.Where(item => item != null && item.isAuction));

        var dropAssign = AssignDrops(itemList, deadPackList.Count);
        var expAssign = AssignExp(expPackList, deadPackList.Count);

        // 构造BattleDrops并缓存
        for (int i = 0; i < deadPackList.Count; i++)
        {
            BattleDeadPack bdp = deadPackList[i];
            int objID = (int)bdp.deadPack.ObjID;
            BattleObject deadTarget = battleField.battleObjMgr.GetBattleObject(objID);

            // 修复：添加空值检查
            if (deadTarget == null)
            {
                Debug.LogError($"找不到死亡目标，ObjID: {objID}");
                continue;
            }

            List<int> itemIndexList = dropAssign[i].Select(item => item.gridIndex).ToList();

            BattleDrops battleDrops = new BattleDrops()
            {
                rectTransform = deadTarget.GetRectTransform(),
                dropItemPackIndex = itemIndexList,
                expDrops = expAssign[i]
            };

            // 修复：避免字典键冲突，使用安全的添加方式
            if (!tempDropList.ContainsKey(objID))
            {
                tempDropList.Add(objID, battleDrops);
            }
            else
            {
                Debug.LogWarning($"tempDropList中已存在ObjID={objID}的记录，将覆盖原值");
                tempDropList[objID] = battleDrops; // 覆盖现有值
            }

            if (!tempDeadPackList.ContainsKey(objID))
            {
                tempDeadPackList.Add(objID, deadPackList[i]);
            }
            else
            {
                Debug.LogWarning($"tempDeadPackList中已存在ObjID={objID}的记录，将覆盖原值");
                tempDeadPackList[objID] = deadPackList[i]; // 覆盖现有值
            }
        }

        // 修复：避免在遍历时修改集合，先收集后删除
        var deadPacksToRemove = new List<GameNetPackBasic>(deadPackList.Select(d => d.deadPack));
        deadPacksToRemove.AddRange(deadPackList.Where(d => d.deadTriggerSkill != null).Select(d => d.deadTriggerSkill));
        foreach (var deadPack in deadPacksToRemove)
        {
            packList.Remove(deadPack);
        }
    }

    // 分配掉落物品：将掉落物品平均分配给死亡对象
    protected List<List<ItemModel>> AssignDrops(List<ItemModel> itemList, int deadCount)
    {
        var dropAssign = new List<List<ItemModel>>();
        for (int i = 0; i < deadCount; i++)
            dropAssign.Add(new List<ItemModel>());
        for (int i = 0; i < itemList.Count; i++)
            dropAssign[i % deadCount].Add(itemList[i]);
        return dropAssign;
    }

    // 获取包的 packUID
    protected ulong GetPackUID(GameNetPackBasic pack)
    {
        if (pack == null) return 0;

        if (pack is HB422_tagMCTurnFightObjDead deadPack)
            return deadPack.packUID;

        if (pack is CustomHB426CombinePack combinePack)
        {
            var mainSkillPack = combinePack.GetMainHB427SkillPack();
            return mainSkillPack?.packUID ?? 0;
        }

        if (pack is HB427_tagSCUseSkill skillPack)
            return skillPack.packUID;

        if (pack is HB428_tagSCBuffRefresh buffRefresh)
            return buffRefresh.packUID;

        if (pack is HB429_tagSCBuffDel buffDel)
            return buffDel.packUID;

        if (pack is HB419_tagSCObjHPRefresh hpRefresh)
            return hpRefresh.packUID;

        if (pack is HB405_tagMCAddExp expPack)
            return expPack.packUID;

        if (pack is H0704_tagRolePackRefresh dropPack)
            return dropPack.packUID;

        // 尝试通过反射获取 packUID
        var packUIDField = pack.GetType().GetField("packUID");
        if (packUIDField != null)
        {
            return (ulong)packUIDField.GetValue(pack);
        }

        return 0;
    }

    // 分配经验值：将经验包平均分配给每个死亡对象
    protected List<List<HB405_tagMCAddExp>> AssignExp(List<HB405_tagMCAddExp> expList, int deadCount)
    {
        var expAssign = new List<List<HB405_tagMCAddExp>>();
        for (int i = 0; i < deadCount; i++)
            expAssign.Add(new List<HB405_tagMCAddExp>());

        // 修复：检查除零风险
        if (deadCount == 0)
        {
            Debug.LogWarning("AssignExp: deadCount为0，无法分配经验");
            return expAssign;
        }

        // 修复：先收集要删除的包，避免在foreach中修改packList
        var expPacksToRemove = new List<HB405_tagMCAddExp>();

        foreach (var expPack in expList)
        {
            long totalExp = GeneralDefine.GetFactValue(expPack.Exp, expPack.ExpPoint);
            long avgExp = totalExp / deadCount;
            long remain = totalExp % deadCount;

            for (int i = 0; i < deadCount; i++)
            {
                long assignExp = avgExp + (i < remain ? 1 : 0);
                var newPack = new HB405_tagMCAddExp
                {
                    Exp = (uint)(assignExp % Constants.ExpPointValue),
                    ExpPoint = (uint)(assignExp / Constants.ExpPointValue),
                    Source = expPack.Source
                };
                expAssign[i].Add(newPack);
            }
            expPacksToRemove.Add(expPack);
        }

        // 统一删除收集的包
        foreach (var pack in expPacksToRemove)
        {
            packList.Remove(pack);
        }

        return expAssign;
    }

    /// <summary>
    /// 将 tempDeadPackList 里 pending 的死亡包投递给 BattleField 生成 DeathRecordAction。
    /// 合并 IsFinished（正常结束）与 ForceFinished（强制结束）两条路径的共同部分。
    /// </summary>
    /// <param name="useInnerPlayer">
    /// true：把 DeathRecordAction 绑定到 ownRecordAction（正常结束，死亡动作会等待当前技能完成）；
    /// false：不绑定（强制结束，死亡动作立即在默认 RecordPlayer 里播放）。
    /// </param>
    /// <param name="clearEvenIfNotDispatched">
    /// true：无论是否投递成功都清空 tempDeadPackList（ForceFinished 语义）；
    /// false：仅在成功投递 DeathRecordAction 时清空（IsFinished 语义）。
    /// </param>
    /// <returns>是否成功投递了 DeathRecordAction。</returns>
    protected bool FlushPendingDeathActions(bool useInnerPlayer, bool clearEvenIfNotDispatched)
    {
        //  防御：battleField / caster 任一为 null 时直接返回，避免 NullReferenceException。
        if (battleField == null || caster == null)
        {
            if (clearEvenIfNotDispatched) tempDeadPackList.Clear();
            return false;
        }

        //  统一做的事：从战场 casting 注册里移除自身。
        battleField.RemoveCastingSkill(caster.ObjID, this);

        var deadPacks = new List<BattleDeadPack>(tempDeadPackList.Values);
        //  两条路径的唯一差别：是否把 DeathRecordAction 绑定到 ownRecordAction（让死亡动作等技能完成）。
        DeathRecordAction recordAction = useInnerPlayer
            ? battleField.OnObjsDead(deadPacks, null, ownRecordAction)
            : battleField.OnObjsDead(deadPacks);

        if (null != recordAction && ownRecordAction != null)
        {
            ownRecordAction.GetInnerRecordPlayer().ImmediatelyPlay(recordAction);
            tempDeadPackList.Clear();
            return true;
        }

        if (clearEvenIfNotDispatched)
        {
            tempDeadPackList.Clear();
        }
        return false;
    }

    // 检查死亡后的包处理：处理技能包、掉落包、经验包
    protected void CheckAfterDeadhPack()
    {
        List<int> removeIndexList = new List<int>();

        for (int i = 0; i < packList.Count; i++)
        {
            var pack = packList[i];

            // 复活基本都靠技能包
            if (pack is CustomHB426CombinePack combinePack && combinePack.startTag.Tag.StartsWith("Skill_"))
                break;

            if (pack is H0704_tagRolePackRefresh h0704Pack && h0704Pack.PackType == (byte)PackType.DropItem && h0704Pack.IsBind == 1)
            {
                dropPackList.Add(h0704Pack);
                removeIndexList.Add(i);
            }

            if (pack is HB405_tagMCAddExp h405Pack && h405Pack.Source == 2)
            {
                expPackList.Add(h405Pack);
                removeIndexList.Add(i);
            }
        }

        for (int i = removeIndexList.Count - 1; i >= 0; i--)
            packList.RemoveAt(removeIndexList[i]);
    }
}