using System;
using System.Collections.Generic;
using System.Linq;
using Continentis.MainGame.Card;
using Continentis.MainGame.Character;
using Continentis.MainGame.Commands;
using Continentis.MainGame.Saving;
using Continentis.MainGame.UI;
using SLSUtilities.General;
using UnityEngine;

namespace Continentis.MainGame.Combat
{
    /// <summary>
    /// 战斗进行状态枚举
    /// </summary>
    public enum CombatState
    {
        InProgress,
        ConfirmingRound,
        Victory,
        Defeat
    }

    public partial class CombatMainManager : Singleton<CombatMainManager>
    {
        public CombatCharacterController characterController;
    }

    public partial class CombatMainManager
    {
        [Header("Combat State")]
        public int currentRound;
        public int currentActionIndex;
        public CharacterBase currentCharacter;
        public CombatState combatState;
    }

    public partial class CombatMainManager
    {
        [Header("Events")]
        public CombatEventCollection eventCollection;
    }

    public partial class CombatMainManager
    {
        protected override void Awake()
        {
            base.Awake();
            characterController = new CombatCharacterController();
            eventCollection = new CombatEventCollection();
        }

        private void Start()
        {
            characterController.Initialize(
                MainGameManager.Instance.playerHeroDataList,
                MainGameManager.Instance.enemyDataList);
            StartCombat();
            CombatUIManager.Instance.UpdateAll();
        }
    }

    public partial class CombatMainManager
    {
        public void StartCombat()
        {
            combatState = CombatState.InProgress;

            foreach (CharacterBase character in characterController.characters)
                character.InitializeCards();

            currentRound = 0;

            eventCollection.onCombatStart.Invoke();

            foreach (CharacterBase character in characterController.characters)
                character.DispatchCombatStart();

            // 1.2b — 初始化 CombatLogs 并订阅事件
            CombatLogs.Instance.Initialize(this);

            NextRound();
        }

        public void NextRound()
        {
            // 战斗已结束则不再推进
            if (combatState != CombatState.InProgress) return;

            currentRound++;

            // UI 反馈：回合提示动画（同步，纯 UI 无逻辑影响）
            CombatUIManager.Instance.combatMainPage.roundHint.PlayRoundHint(currentRound);

            // ── 纯逻辑初始化（无视觉反馈，同步执行）────────────────────────────
            eventCollection.onRoundStart.Invoke();
            foreach (CharacterBase character in characterController.characters)
                character.actionCountThisRound = 0;

            characterController.SetActionOrder();
            CombatUIManager.Instance.combatMainPage.actionOrderDisplayer.InitializeTurnOrder();
            currentActionIndex = 0;

            // ── NPC 意图决策（同步，不产生视觉效果）────────────────────────────
            foreach (CharacterBase character in characterController.characters)
            {
                if (character is CombatNPC npc)
                {
                    npc.IntentionBrain();
                    npc.deckSubmodule.PoolPile.ForEach(card => card.weightSubmodule.RefreshCurrentWeight());
                    npc.intentionSubmodule.getIntendedCards.Invoke();

                    foreach (IntendedCard intendedCard in npc.intentionSubmodule.intendedCards)
                    {
                        intendedCard.cardInstance.GenerateIntentionCardView();
                        if (intendedCard.targets.Count > 0)
                        {
                            CardInstance card = intendedCard.cardInstance;
                            card.Targeting(intendedCard.targets[0]);
                            card.contentSubmodule.dirtyMark = true;
                        }
                    }
                }
            }

            // ── 进入"回合前确认"阶段：等待玩家点击 Confirm ───────────────────
            combatState = CombatState.ConfirmingRound;
            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
            {
                CombatMainPage page = CombatUIManager.Instance.combatMainPage;
                page.SetButtonAction(ConfirmRound, "Confirm", true);
            }));

            CommandBase waitSignal = Cmd.WaitForSignal(out confirmRoundSignal);
            CommandQueueManager.Instance.AddCommand(waitSignal);

            // ── 玩家确认后，回合正式开始：Buff 触发链入队 ────────────────────
            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
            {
                combatState = CombatState.InProgress;
                CombatUIManager.Instance.combatMainPage.SetButtonAction(
                    EndAction, "Waiting...", false);
            }));

            foreach (CharacterBase character in characterController.characters)
            {
                CharacterBase captured = character;
                CommandQueueManager.Instance.AddCommand(Cmd.Do(() => captured.DispatchRoundStart()));
            }

            // ── 所有回合开始事件处理完毕后，进入第一个行动 ────────────────────
            CommandQueueManager.Instance.AddCommand(Cmd.Do(NextAction));
        }

        /// <summary>
        /// 玩家在"回合前确认"阶段点击 Confirm 后调用，释放队列暂停信号。
        /// </summary>
        public void ConfirmRound()
        {
            if (combatState != CombatState.ConfirmingRound) return;
            confirmRoundSignal?.Invoke();
            confirmRoundSignal = null;
        }

        // 持有当前回合的信号委托，ConfirmRound() 调用后置 null 防止重复触发
        private Action confirmRoundSignal;

        public void NextAction()
        {
            // 战斗已结束则不再推进
            if (combatState != CombatState.InProgress) return;

            if (characterController.actionOrderList.Count == 0)
            {
                // 回合结束：所有角色的 onRoundEnd 和 Buff 触发均入队
                foreach (CharacterBase character in characterController.characters)
                {
                    CharacterBase captured = character;
                    CommandQueueManager.Instance.AddCommand(Cmd.Do(() => captured.DispatchRoundEnd()));
                }

                CommandQueueManager.Instance.AddCommand(Cmd.Do(NextRound));
                return;
            }

            currentCharacter = characterController.actionOrderList[0];

            CharacterBase actionCharacter = currentCharacter;
            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
            {
                actionCharacter.DispatchActionStart();
                actionCharacter.recordSubmodule.SetAction(currentRound, ++currentActionIndex);
            }));

            CombatMainPage combatMainPage = CombatUIManager.Instance.combatMainPage;

            if (currentCharacter is PlayerHero playerHero)
            {
                playerHero.deckSubmodule.SetUpHandCardViews();
                combatMainPage.handPile.isUpdatingLayout = false;

                CommandQueueManager.Instance.AddCommand(
                    playerHero.deckSubmodule.DrawCards(playerHero.GetAttribute("DrawCardAmountPerAction")));

                CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
                {
                    combatMainPage.handPile.isUpdatingLayout = true;
                }));

                combatMainPage.combatResourcesDisplayer.SetCharacter(playerHero);
                combatMainPage.SetButtonAction(EndAction, "End Action", true);
            }
            else if (currentCharacter is CombatNPC)
            {
                string npcLabel = currentCharacter.fraction switch
                {
                    Fraction.Enemy => "Enemy Action",
                    Fraction.Ally  => "Ally Action",
                    _              => "Others Action"
                };
                combatMainPage.SetButtonAction(null, npcLabel, false);

                CommandQueueManager.Instance.AddCommand(Cmd.Wait(0.25f));

                // 2.3e — PreAction 钩子：NPC 出牌前
                CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
                    currentCharacter.intentionSubmodule.currentIntention.PreAction()));

                foreach (IntendedCard intendedCard in currentCharacter.intentionSubmodule.intendedCards)
                {
                    IntendedCard captured = intendedCard;
                    currentCharacter.CheckAvailabilityAndSetTargets(captured.cardInstance, out captured.targets);

                    CommandQueueManager.Instance.AddCommand(Cmd.Sequential(
                        Cmd.Do(() => {
                            captured.cardInstance.Play(captured.targets, currentCharacter);
                            captured.cardInstance.DestroyIntentionCardView();
                        }),
                        Cmd.Wait(0.25f)
                    ));
                }

                // 2.3e — PostAction 钩子：NPC 出完全部卡牌后
                CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
                    currentCharacter.intentionSubmodule.currentIntention.PostAction()));

                CommandQueueManager.Instance.AddCommand(Cmd.Do(EndAction));
            }

            currentCharacter.characterView.hudContainer.UpdateAllHUD();
            CombatUIManager.Instance.combatMainPage.actionOrderDisplayer.avatars
                .Find(avatar => avatar.character == currentCharacter)?.Highlight(true);
            currentCharacter.actionCountThisRound++;
        }

        public void EndAction()
        {
            CombatUIManager.Instance.combatMainPage.SetButtonAction(null, "Waiting...", false);

            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
            {
                currentCharacter.DispatchActionEnd();

                if (currentCharacter is PlayerHero playerHero)
                {
                    List<CardInstance> handPile = new List<CardInstance>(playerHero.deckSubmodule.HandPile);
                    List<CardInstance> cardToRetain  = handPile.Where(c => c.HasKeyword("Retain")).ToList();
                    List<CardInstance> cardToExhaust = handPile.Where(c => c.HasKeyword("Ethereal")).ToList();
                    List<CardInstance> cardsToDiscard = handPile.Except(cardToRetain).Except(cardToExhaust).ToList();

                    CommandQueueManager.Instance.AddCommand(playerHero.deckSubmodule.ExhaustCards(cardToExhaust));
                    CommandQueueManager.Instance.AddCommand(playerHero.deckSubmodule.DiscardCards(cardsToDiscard, false));
                }

                characterController.actionOrderList.Remove(currentCharacter);
                CombatUIManager.Instance.combatMainPage.actionOrderDisplayer.EndAction();

                CommandQueueManager.Instance.AddCommand(Cmd.Do(CombatUIManager.Instance.combatMainPage.ClearAllCardViews));
                CommandQueueManager.Instance.AddCommand(Cmd.Wait(0.5f));
                CommandQueueManager.Instance.AddCommand(Cmd.Do(NextAction));
            }));
        }
    }

    public partial class CombatMainManager
    {
        /// <summary>
        /// 结束战斗，触发胜负流程。由 CombatCharacterController.CheckCombatEnd() 调用。
        /// </summary>
        public void EndCombat(bool isVictory)
        {
            // 防止重复触发
            if (combatState != CombatState.InProgress) return;

            combatState = isVictory ? CombatState.Victory : CombatState.Defeat;

            // 触发战斗结束全局事件
            eventCollection.onCombatEnd.Invoke();

            foreach (CharacterBase character in characterController.characters)
                character.DispatchCombatEnd();

            // 清理所有卡牌 Logic 的托管订阅
            foreach (CharacterBase character in characterController.characters)
                foreach (CardInstance card in character.deckSubmodule.GetAllCards())
                    card.cardLogic?.Dispose();

            if (isVictory)
            {
                CombatVictory();
            }
            else
            {
                CombatDefeat();
            }
        }

        /// <summary>
        /// 战斗胜利处理：收集战后英雄 HP，通知 MainGameManager 推进节点并存档。
        /// </summary>
        private void CombatVictory()
        {
            CombatUIManager.Instance.combatMainPage.SetButtonAction(null, "Victory!", false);

            // 将玩家英雄的战后 HP 与 RunSave 中的 HeroSave 对应：按 currentRun.heroes 顺序匹配
            var heroResults = new List<(string heroID, int currentHP)>();
            List<HeroSave> runHeroes = MainGameManager.Instance.currentRun?.heroes;
            if (runHeroes != null)
            {
                for (int i = 0; i < Mathf.Min(characterController.playerHeroes.Count, runHeroes.Count); i++)
                {
                    int hp = Mathf.RoundToInt(characterController.playerHeroes[i].GetAttribute("Health"));
                    heroResults.Add((runHeroes[i].characterDataID, hp));
                }
            }

            // CommandQueue 执行完毕后再切场景，避免队列中残余命令在新场景报错
            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
                MainGameManager.Instance.ExitCombat(isVictory: true, heroResults)));
        }

        /// <summary>
        /// 战斗失败处理：通知 MainGameManager 删档并返回主菜单。
        /// </summary>
        private void CombatDefeat()
        {
            CombatUIManager.Instance.combatMainPage.SetButtonAction(null, "Defeat...", false);

            CommandQueueManager.Instance.AddCommand(Cmd.Do(() =>
                MainGameManager.Instance.ExitCombat(isVictory: false)));
        }
    }
}