using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
using DG.Tweening;
using Cysharp.Threading.Tasks;
using System;
using LitJson;

//  这个界面是 persistent的界面
public class BattleHUDWin : UIBase
{
    private const int CASTER_DAMAGE_HEIGHT_OFFSET = 100; // 施法者伤害高度间隔
    private const int CASTER_DAMAGE_FLOAT_HEIGHT = 150;  // 飘字向上移动高度
    private const int TARGET_DAMAGE_FLOAT_HEIGHT = 150;  // 目标伤害飘字向上移动高度

    private GameObjectPoolManager.GameObjectPool damagePrefabPool;
    private GameObjectPoolManager.GameObjectPool buffIconPrefabPool;
    private GameObjectPoolManager.GameObjectPool buffLabelPrefabPool;

    public Transform damageNode;
    public Transform buffIconNode;
    public Transform buffLabelNode;

    private BattleField battleField;
    private List<DamageContent> damageContentList = new List<DamageContent>();

    protected override void InitComponent()
    {
        base.InitComponent();
    }

    protected override void OnPreOpen()
    {
        base.OnPreOpen();
        RegisterEvents();
        InitializePools();
    }

    protected override void OnPreClose()
    {
        base.OnPreClose();
        UnregisterEvents();
    }

    protected override void OnOpen()
    {
        base.OnOpen();
    }

    protected override void OnClose()
    {
        base.OnClose();
        CleanupBattleField();
    }

    protected override void NextFrameAfterOpen()
    {
        base.NextFrameAfterOpen();
    }

    protected override void CompleteClose()
    {
        base.CompleteClose();
    }

    private void RegisterEvents()
    {
        EventBroadcast.Instance.AddListener<BattleDmgInfo>(EventName.BATTLE_DAMAGE_TAKEN, OnDamageTaken);
        EventBroadcast.Instance.AddListener<string, JsonData>(EventName.BATTLE_END, OnBattleEnd);
    }

    private void UnregisterEvents()
    {
        EventBroadcast.Instance.RemoveListener<BattleDmgInfo>(EventName.BATTLE_DAMAGE_TAKEN, OnDamageTaken);
        EventBroadcast.Instance.RemoveListener<string, JsonData>(EventName.BATTLE_END, OnBattleEnd);
    }

    private void InitializePools()
    {
        damagePrefabPool = GameObjectPoolManager.Instance.GetPool(UILoader.LoadPrefab("DamageContent"));
    }

    public void SetBattleField(BattleField _battleField)
    {
        CleanupBattleField();
        ClearContent(string.Empty, true);
        
        battleField = _battleField;
        RegisterBattleFieldEvents();
    }

    private void RegisterBattleFieldEvents()
    {
        if (battleField == null) return;
        
        battleField.OnBattlePause += OnBattlePause;
        battleField.OnBattleRun += OnBattleRun;
        battleField.OnSpeedRatioChange += OnSpeedRatioChange;
    }

    private void UnregisterBattleFieldEvents()
    {
        if (battleField == null) return;
        
        battleField.OnBattlePause -= OnBattlePause;
        battleField.OnBattleRun -= OnBattleRun;
        battleField.OnSpeedRatioChange -= OnSpeedRatioChange;
    }

    private void CleanupBattleField()
    {
        UnregisterBattleFieldEvents();
        battleField = null;
    }

    private void OnBattleEnd(string guid, JsonData data)
    {
        ClearContent(guid);
    }

    private void OnDamageTaken(BattleDmgInfo damageInfo)
    {
        SetTargetDamage(damageInfo);
        SetSelfDamage(damageInfo);
    }

    private void OnSpeedRatioChange(float newSpeedRatio)
    {
        foreach (var content in damageContentList)
        {
            content.SetRatio(newSpeedRatio, 1f);
        }
    }

    private void OnBattlePause(bool isPause)
    {
        if (isPause)
        {
            PauseAllDamageContent();
        }
        else
        {
            ResumeAllDamageContent();
        }
    }

    private void OnBattleRun()
    {
        RunAllDamageContent();
    }

    /// <summary>
    /// 设置目标受到的伤害显示
    /// </summary>
    private void SetTargetDamage(BattleDmgInfo damageInfo)
    {
        if (damageInfo.targetDamageList.Count == 0) return;

        RectTransform heroRect = damageInfo.hurtObj.heroRectTrans;
        if (heroRect == null) return;

        DamageContent content = CreateDamageContent();
        if (content == null) return;

        Vector2 anchoredPos = CalculateWorldToLocalPosition(heroRect, content);
        SetupTargetDamagePosition(content, anchoredPos);
        SetupDamageContent(content, damageInfo.targetDamageList, damageInfo);
    }

    /// <summary>
    /// 设置目标伤害的起始和结束位置
    /// </summary>
    private void SetupTargetDamagePosition(DamageContent content, Vector2 anchoredPos)
    {
        // 保持英雄的 X 坐标，只在 Y 轴向上飘
        Vector2 beginPos = anchoredPos;
        Vector2 endPos = anchoredPos + new Vector2(0, TARGET_DAMAGE_FLOAT_HEIGHT);
        content.SetPosition(beginPos, endPos);
    }

    /// <summary>
    /// 设置施法者受到的伤害显示（反伤、吸血等）
    /// </summary>
    private void SetSelfDamage(BattleDmgInfo damageInfo)
    {
        if (damageInfo.casterDamageList.Count == 0) return;

        RectTransform heroRect = damageInfo.casterObj.heroRectTrans;
        if (heroRect == null) return;

        // 创建单个DamageContent显示所有施法者伤害
        DamageContent content = CreateDamageContent();
        if (content == null) return;

        Vector2 anchoredPos = CalculateWorldToLocalPosition(heroRect, content);
        SetupCasterDamagePosition(content, anchoredPos);
        SetupDamageContent(content, damageInfo.casterDamageList, damageInfo);
    }

    /// <summary>
    /// 设置施法者伤害的起始和结束位置
    /// </summary>
    private void SetupCasterDamagePosition(DamageContent content, Vector2 anchoredPos)
    {
        // 保持英雄的 X 坐标，只在 Y 轴向上飘
        Vector2 beginPos = anchoredPos;
        Vector2 endPos = anchoredPos + new Vector2(0, CASTER_DAMAGE_FLOAT_HEIGHT);
        content.SetPosition(beginPos, endPos);
    }

    /// <summary>
    /// 创建一个DamageContent对象
    /// </summary>
    private DamageContent CreateDamageContent()
    {
        GameObject damageContentObj = damagePrefabPool.Request();
        DamageContent content = damageContentObj.GetComponent<DamageContent>();
        damageContentObj.transform.SetParent(damageNode, false);
        return content;
    }

    /// <summary>
    /// 计算英雄世界坐标到本地坐标的转换
    /// </summary>
    private Vector2 CalculateWorldToLocalPosition(RectTransform heroRect, DamageContent content)
    {
        RectTransform contentRect = content.GetComponent<RectTransform>();
        RectTransform contentParentRect = contentRect.parent as RectTransform;

        Vector3 worldTargetPos = heroRect.transform.TransformPoint(heroRect.rect.center);

        Vector2 anchoredPos;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(
            contentParentRect,
            RectTransformUtility.WorldToScreenPoint(null, worldTargetPos),
            null,
            out anchoredPos);

        return anchoredPos;
    }

    /// <summary>
    /// 配置DamageContent的速度、伤害数据和回调
    /// </summary>
    private void SetupDamageContent(DamageContent content, List<BattleDmg> damageList, BattleDmgInfo damageInfo)
    {
        if (battleField != null)
        {
            content.SetRatio(battleField.speedRatio, 1f);
        }

        content.SetDamage(damageInfo, damageList, () => RemoveDamageContent(content));
        damageContentList.Add(content);
    }

    /// <summary>
    /// 移除DamageContent对象
    /// </summary>
    private void RemoveDamageContent(DamageContent content)
    {
        damageContentList.Remove(content);
        damagePrefabPool.Release(content.gameObject);
    }

    /// <summary>
    /// 清除所有伤害显示内容
    /// </summary>
    private void ClearContent(string guid, bool force = false)
    {
        if ((battleField != null && battleField.guid == guid) || force)
        {
            for (int i = damageContentList.Count - 1; i >= 0; i--)
            {
                var content = damageContentList[i];
                content.Stop();
                RemoveDamageContent(content);
            }
            damageContentList.Clear();
        }
    }

    private void PauseAllDamageContent()
    {
        foreach (var content in damageContentList)
        {
            content.Stop();
        }
    }

    private void ResumeAllDamageContent()
    {
        foreach (var content in damageContentList)
        {
            content.Resume();
        }
    }

    private void RunAllDamageContent()
    {
        for (int i = damageContentList.Count - 1; i >= 0; i--)
        {
            if (i < damageContentList.Count)
            {
                damageContentList[i].Run();
            }
        }
    }
}