using System;
using ActionGameFramework.Health;
using Core.Utilities;
using TowerDefense.Level;
using TowerDefense.Targetting;
using TowerDefense.Towers.Placement;
using TowerDefense.UI.HUD;
using UnityEngine;

namespace TowerDefense.Towers
{
    public enum EFeatureTower
    {
        NULL,
        GrowUp,
        CopyCat,
        LightTower,
        Skill_Fire,
        Skill_Bomb,
        END
    }

    public enum ETowerFuntion
    {
        NULL,
        BULLET,   // 子弹塔
        ENERGY,   // 能量充能.
        END
    }

    /// <summary>
    /// Common functionality for all types of towers
    /// </summary>
    public class Tower : Targetable
    {
        public readonly float INSCENE_TU_DAMAGE = 30f;
        public static readonly int MAX_LEVEL = 4;

        /// <summary>
        /// A generalised name common to a levels
        /// </summary>
        public string towerName;

        /// <summary>
        /// The size of the tower's footprint
        /// </summary>
        public IntVector2 dimensions;

        /// <summary>
        /// 是否是特色骰子，如果是，则选择一个Enum类型。
        /// </summary>
        public EFeatureTower towerFeature = EFeatureTower.NULL;

        /// <summary>
        /// 当前塔防对应的MonsterMaterial，自身和对方显示不同的Mat.
        /// </summary>
        public Material materialMonsterSelf;
        public Material materialMonsterOppo;

        /// <summary>
        /// 当前塔防对应的攻击和等待Mat.
        /// </summary>
        public Material materialTowerAttackSelf;
        public Material materialTowerWaitSelf;
        public Material materialTowerAttackOppo;
        public Material materialTowerWaitOppo;

        /// <summary>
        /// 0 空状态  1 等待状态  2 攻击状态.
        /// </summary>
        protected int curActionState = 0;

        /// <summary>
        /// 塔防对应的充能状态.
        /// </summary>
        public ETowerFuntion eTowerFuntion = ETowerFuntion.NULL;
        public BulletUICtl bulletCtl = null;
        public EnergyUICtl energyCtl = null;

        /// <summary>
        /// The tower levels associated with this tower
        /// </summary>
        public TowerLevel[] levels;

        /// <summary>
        /// 当前塔防对应的AttributeID.
        /// </summary>
        public int attributeId;

        /// <summary>
        /// 当前的Tower在游戏内UI界面上用到的Image数据，再以后应该是直接在表格内配置才合适
        /// </summary>
        public Sprite uiImage;

        /// <summary>
        /// The physics mask the tower searches on
        /// </summary>
        public LayerMask enemyLayerMask;

        /// <summary>
        /// The current level of the tower
        /// </summary>
        public int currentLevel { get; protected set; }

        protected bool m_bInAttackMode = false;

        /// <summary>
        /// 精英怪和Boss双倍伤害.
        /// </summary>
        public bool bDoubleHitElit = false;

        /// <summary>
        /// Reference to the data of the current level
        /// </summary>
        public TowerLevel currentTowerLevel { get; protected set; }

        /// <summary>
        /// 攻击增加
        /// </summary>
        public float attackRise { get; set; }


        /// <summary>
        /// 塔防数据的局内升级
        /// </summary>
        public int inSceneTowerLevel
        {
            get; set;
        }

        /// <summary>
        /// Gets whether the tower can level up anymore
        /// </summary>
        public bool isAtMaxLevel
        {
            get { return currentLevel == levels.Length - 1; }
        }

        public void setTowerState(bool attack)
        {
            if (!materialTowerAttackSelf) return;

            if( opponentSide)
            {
                if (attack && (this.curActionState != 2))
                {
                    currentTowerLevel.SetTowerMonsterMat(materialTowerAttackOppo);
                    this.curActionState = 2;
                }

                if ((!attack) && (this.curActionState != 1))
                {
                    currentTowerLevel.SetTowerMonsterMat( materialTowerWaitOppo );
                    this.curActionState = 1;
                }
            }
            else
            {
                if (attack && (this.curActionState != 2))
                {
                    currentTowerLevel.SetTowerMonsterMat(materialTowerAttackSelf);
                    this.curActionState = 2;
                }

                if ((!attack) && (this.curActionState != 1))
                {
                    currentTowerLevel.SetTowerMonsterMat(materialTowerWaitSelf);
                    this.curActionState = 1;
                }
            }
        }

        /// <summary>
        /// 是否是对手塔防
        /// </summary>
        public bool opponentSide { get; set; }

        /// <summary>
        /// 当前是否处于攻击模式
        /// </summary>
        public bool bInAttackMode
        {
            get { return this.m_bInAttackMode; }

            // 设置是否处于攻击状态:
            set
            {
                m_bInAttackMode = value;
                currentTowerLevel.SetAffectorState(m_bInAttackMode, gridPosition.x);
                if (value)
                {
                    if (opponentSide)
                        currentTowerLevel.SetTowerMonsterMat(materialMonsterOppo);
                    else
                        currentTowerLevel.SetTowerMonsterMat(materialMonsterSelf);

                    // 处理Tower
                    this.setTowerState(false);

                    if (opponentSide)
                    {
                        OpponentMgr.instance.SetTowerAttID(gridPosition.x, attributeId, this.currentLevel);
                    }
                    else
                    {
                        if (LevelManager.instanceExists)
                        {
                            LevelManager.instance.SetTowerAttID(gridPosition.x, attributeId, this.currentLevel);
                            WaveLineSelMgr.instance.attackTowerFixed(gridPosition.x);
                        }
                        else if (EndlessLevelManager.instanceExists)
                        {
                            EndlessLevelManager.instance.SetTowerAttID(gridPosition.x, attributeId, this.currentLevel);
                            EndlessWaveLineManager.instance.AttackTowerFixed(gridPosition.x);
                        }
                    }

                    // 处理塔位边上的界面.
                    OnTowerUICtrl();
                }

            }
        }

        protected void OnTowerUICtrl()
        {
            // 
            // 根据是否是子弹塔防来决定是否显示相应的界面
            BulletUICtl buc = this.placementArea.GetBulletUICtl(gridPosition.x);
            if ((this.eTowerFuntion == ETowerFuntion.BULLET) && (buc != null))
            {
                // 设置数据
                buc.gameObject.SetActive(true);
                this.bulletCtl = buc;
                buc.resetToMaxBullet();
            }
            else
            {
                // 清空数据
                buc.gameObject.SetActive(false);
                this.bulletCtl = null;
            }

            // 根据是否是能量充能来决定是否显示相应的界面.
            EnergyUICtl euc = placementArea.GetEnergyUICtl(gridPosition.x);
            if( (eTowerFuntion == ETowerFuntion.ENERGY) &&(euc != null ))
            {
                // 设置数据
                euc.gameObject.SetActive(true);
                this.energyCtl = euc;
                euc.SetEnergyProgress(0);
            }
            else
            {
                // 清空数据
                euc.gameObject.SetActive(false);
                this.energyCtl = null;
            }
        }

        /// <summary>
        /// 初始化当前塔防的局内升级,lvl从1开始.
        /// </summary>
        /// <param name="lvl"></param>
        public void initInSceneTowerLevel(int lvl)
        {
            inSceneTowerLevel = lvl;
            if (lvl <= 1)
            {
                ResetInSceneTowerLevel();
                return;
            }
            // 设置攻击数据的加强，暂时是测试数据，后面需要读取表格数据处理：
            float damageAdd = (inSceneTowerLevel - 1) * this.INSCENE_TU_DAMAGE;
            for (int ti = 0; ti < this.levels.Length; ti++)
            {
                if (levels[ti].levelDamager)
                {
                    levels[ti].levelDamager.doubleHit = bDoubleHitElit;
                    levels[ti].levelDamager.inSceneUpGradeDamage = damageAdd;
                }
            }
        }

        protected void ResetInSceneTowerLevel()
        {
            for (int ti = 0; ti < this.levels.Length; ti++)
            {
                if (levels[ti].levelDamager)
                {
                    levels[ti].levelDamager.inSceneUpGradeDamage = 0;
                    levels[ti].levelDamager.doubleHit = bDoubleHitElit;
                }
            }
            return;
        }

        /// <summary>
        /// 升级当前塔防的局内等级，需要播放相关的特效
        /// </summary>
        public void upGradeInSceneTL()
        {
            inSceneTowerLevel++;

            // 设置攻击数据的加强，暂时是测试数据，后面需要读取表格数据处理：
            float damageAdd = inSceneTowerLevel * this.INSCENE_TU_DAMAGE;

            for (int ti = 0; ti < this.levels.Length; ti++)
            {
                if (levels[ti].levelDamager)
                {
                    levels[ti].levelDamager.inSceneUpGradeDamage = damageAdd;
                    levels[ti].levelDamager.towerName = name;
                    levels[ti].levelDamager.bSet = true;
                }
            }

            Debug.Log("Upgrade Tower name is:" + name);

            // 播放相关的特效
            currentTowerLevel.PlayUpGradeEffect();
        }

        /// <summary>
        /// Gets the first level tower ghost prefab
        /// </summary>
        public TowerPlacementGhost towerGhostPrefab
        {
            get { return levels[currentLevel].towerGhostPrefab; }
        }

        /// <summary>
        /// Gets the grid position for this tower on the <see cref="placementArea"/>
        /// </summary>
        public IntVector2 gridPosition { get; private set; }

        /// <summary>
        /// The placement area we've been built on
        /// </summary>
        public IPlacementArea placementArea { get; private set; }

        /// <summary>
        /// The purchase cost of the tower
        /// </summary>
        public int purchaseCost
        {
            get { return levels[0].cost; }
        }

        /// <summary>
        /// The event that fires off when a player deletes a tower
        /// </summary>
        public Action towerDeleted;

        /// <summary>
        /// The event that fires off when a tower has been destroyed
        /// </summary>
        public Action towerDestroyed;

        /// <summary>
        /// Provide the tower with data to initialize with
        /// </summary>
        /// <param name="targetArea">The placement area configuration</param>
        /// <param name="destination">The destination position</param>
        public virtual void Initialize(IPlacementArea targetArea, IntVector2 destination, int lvl = 0)
        {
            placementArea = targetArea;
            gridPosition = destination;

            if (targetArea != null)
            {
                transform.position = placementArea.GridToWorld(destination, dimensions);
                transform.rotation = placementArea.transform.rotation;
                targetArea.Occupy(destination, dimensions);
            }

            SetLevel(lvl);
            if (LevelManager.instanceExists)
            {
                LevelManager.instance.levelStateChanged += OnLevelStateChanged;
            }
            else if (EndlessLevelManager.instanceExists)
                EndlessLevelManager.instance.LevelStateChanged += OnLevelStateChanged;

            // 查找Targetter:
            Targetter target = this.GetComponentInChildren<Targetter>();
            if (target)
            {
                target.bOpponent = this.opponentSide;
            }
            else
                Debug.Log("在当前的Tower中找不到Targetter.");

            // 
            // 初始化当前的局内Tower等级数据
            this.initInSceneTowerLevel(SceneTowerLvl.getInSceneTowerLvl(this.towerName));
        }

        /// <summary>
        /// Provides information on the cost to upgrade
        /// </summary>
        /// <returns>Returns -1 if the towers is already at max level, other returns the cost to upgrade</returns>
        public int GetCostForNextLevel()
        {
            if (isAtMaxLevel)
            {
                return -1;
            }
            return levels[currentLevel + 1].cost;
        }

        /// <summary>
        /// 当前的Tower是显示还是隐藏，用于减少游戏内Tower创建和删除对应的一系列数据操作
        /// </summary>
        /// <param name="vis"></param>
        public void showTower(bool vis)
        {
            if (vis)
            {
                this.gameObject.SetActive(true);
            }
            else
            {
                this.gameObject.SetActive(false);
            }
        }

        /// <summary>
        /// Kills this tower
        /// </summary>
        public void KillTower()
        {
            // Invoke base kill method
            Kill();
        }

        /// <summary>
        /// Provides the value recived for selling this tower
        /// </summary>
        /// <returns>A sell value of the tower</returns>
        public int GetSellLevel()
        {
            return GetSellLevel(currentLevel);
        }

        /// <summary>
        /// Provides the value recived for selling this tower of a particular level
        /// </summary>
        /// <param name="level">Level of tower</param>
        /// <returns>A sell value of the tower</returns>
        public int GetSellLevel(int level)
        {
            // sell for full price if waves haven't started yet
            if (LevelManager.instanceExists && LevelManager.instance.levelState == LevelState.Building
                || EndlessLevelManager.instanceExists && EndlessLevelManager.instance.EndlessLeveltate == LevelState.Building)
            {
                int cost = 0;
                for (int i = 0; i <= level; i++)
                {
                    cost += levels[i].cost;
                }

                return cost;
            }
            return levels[currentLevel].sell;
        }

        /// <summary>
        /// Used to (try to) upgrade the tower data
        /// </summary>
        public virtual bool UpgradeTower()
        {
            if (isAtMaxLevel)
            {
                return false;
            }
            SetLevel(currentLevel + 1);
            return true;
        }

        /// <summary>
        /// A method for downgrading tower
        /// </summary>
        /// <returns>
        /// <value>false</value> if tower is at lowest level
        /// </returns>
        public virtual bool DowngradeTower()
        {
            if (currentLevel == 0)
            {
                return false;
            }
            SetLevel(currentLevel - 1);
            return true;
        }

        /// <summary>
        /// Used to set the tower to any valid level
        /// </summary>
        /// <param name="level">
        /// The level to upgrade the tower to
        /// </param>
        /// <returns>
        /// True if successful
        /// </returns>
        public virtual bool UpgradeTowerToLevel(int level)
        {
            if (level < 0 || isAtMaxLevel || level >= levels.Length)
            {
                return false;
            }
            SetLevel(level);
            return true;
        }

        public void Sell()
        {
            Remove();
        }

        /// <summary>
        /// Removes tower from placement area and destroys it
        /// </summary>
        public override void Remove()
        {
            base.Remove();

            // 清空局内升级数据:
            ResetInSceneTowerLevel();
            attackRise = 0.0f;
            placementArea.Clear(gridPosition, dimensions);
            Destroy(gameObject);
        }

        /// <summary>
        /// unsubsribe when necessary
        /// </summary>
        protected virtual void OnDestroy()
        {
            if (LevelManager.instanceExists)
            {
                LevelManager.instance.levelStateChanged += OnLevelStateChanged;
            }
            else if (EndlessLevelManager.instanceExists)
                EndlessLevelManager.instance.LevelStateChanged += OnLevelStateChanged;
        }

        /// <summary>
        /// Cache and update oftenly used data
        /// </summary>
        public void SetLevel(int level)
        {
            if (level < 0 || level >= levels.Length)
            {
                return;
            }
            currentLevel = level;
            if (currentTowerLevel != null)
            {
                Destroy(currentTowerLevel.gameObject);
            }

            // instantiate the visual representation
            currentTowerLevel = Instantiate(levels[currentLevel], transform);

            // initialize TowerLevel
            currentTowerLevel.Initialize(this, enemyLayerMask, configuration.alignmentProvider);

            // health data
            ScaleHealth();

            // 
            // disable affectors
            LevelState levelState = LevelState.Intro;
            if (LevelManager.instanceExists)
                levelState = LevelManager.instance.levelState;
            else if (EndlessLevelManager.instanceExists)
                levelState = EndlessLevelManager.instance.EndlessLeveltate;
            bool initialise = levelState == LevelState.AllEnemiesSpawned || levelState == LevelState.SpawningEnemies;
            initialise = false;
            currentTowerLevel.SetAffectorState(initialise, gridPosition.x);
        }

        /// <summary>
        /// Scales the health based on the previous health
        /// Requires override when the rules for scaling health on upgrade changes
        /// </summary>
        protected virtual void ScaleHealth()
        {
            configuration.SetMaxHealth(currentTowerLevel.maxHealth);

            if (currentLevel == 0)
            {
                configuration.SetHealth(currentTowerLevel.maxHealth);
            }
            else
            {
                int currentHealth = Mathf.FloorToInt(configuration.normalisedHealth * currentTowerLevel.maxHealth);
                configuration.SetHealth(currentHealth);
            }
        }

        /// <summary>
        /// Intiailises affectors based on the level state
        /// </summary>
        protected virtual void OnLevelStateChanged(LevelState previous, LevelState current)
        {
            bool initialise = current == LevelState.AllEnemiesSpawned || current == LevelState.SpawningEnemies;
            initialise = false;
            //currentTowerLevel.SetAffectorState(initialise);
            currentTowerLevel.SetAffectorState(bInAttackMode, gridPosition.x);
        }
    }
}