using System;
using Godot;


/// <summary>
/// 玩家角色基类, 所有角色都必须继承该类
/// </summary>
[Tool]
public partial class Player : Role
{
    /// <summary>
    /// 获取当前操作的角色
    /// </summary>
    public static Player Current { get; private set; }
    
    /// <summary>
    /// 玩家身上的状态机控制器
    /// </summary>
    public StateController<Player, PlayerStateEnum> StateController { get; private set; }

    /// <summary>
    /// 设置当前操作的玩家对象
    /// </summary>
    public static void SetCurrentPlayer(Player player)
    {
        Current = player;
        //设置相机和鼠标跟随玩家
        GameCamera.Main.SetFollowTarget(player);
        GameApplication.Instance.Cursor.SetMountRole(player);
    }
    
    public override void OnInit()
    {
        base.OnInit();

        IsAi = false;
        StateController = AddComponent<StateController<Player, PlayerStateEnum>>();
        AttackLayer = PhysicsLayer.Wall | PhysicsLayer.Enemy;
        EnemyLayer = EnemyLayer = PhysicsLayer.Enemy;
        Camp = CampEnum.Camp1;

        MaxHp = 6;
        Hp = 6;
        MaxShield = 0;
        Shield = 0;

        // debug用
        // RoleState.Acceleration = 3000;
        // RoleState.Friction = 3000;
        // RoleState.MoveSpeed = 500;
        // CollisionLayer = 0;
        // CollisionMask = 0;
        //GameCamera.Main.Zoom = new Vector2(0.2f, 0.2f);
        //GameCamera.Main.Zoom = new Vector2(0.5f, 0.5f);
        this.CallDelay(0.5f, () =>
        {
            var weapon = Create<Weapon>(Ids.Id_weapon0009);
            PickUpWeapon(weapon);
        });
        
        //注册状态机
        StateController.Register(new PlayerIdleState());
        StateController.Register(new PlayerMoveState());
        StateController.Register(new PlayerRollState());
        //默认状态
        StateController.ChangeStateInstant(PlayerStateEnum.Idle);

        //InitSubLine();
    }

    protected override void Process(float delta)
    {
        base.Process(delta);
        if (IsDie)
        {
            return;
        }
        //脸的朝向
        if (LookTarget == null)
        {
            var gPos = GlobalPosition;
            Vector2 mousePos = InputManager.CursorPosition;
            if (mousePos.X > gPos.X && Face == FaceDirection.Left)
            {
                Face = FaceDirection.Right;
            }
            else if (mousePos.X < gPos.X && Face == FaceDirection.Right)
            {
                Face = FaceDirection.Left;
            }

            if (MountLookTarget)
            {
                //枪口跟随鼠标
                MountPoint.SetLookAt(mousePos);
            }
        }

        if (InputManager.ExchangeWeapon) //切换武器
        {
            ExchangeNextWeapon();
        }
        else if (InputManager.ThrowWeapon) //扔掉武器
        {
            ThrowWeapon();

            // //测试用的, 所有敌人也扔掉武器
            // if (Affiliation != null)
            // {
            //     var enemies = Affiliation.FindIncludeItems(o =>
            //     {
            //         return o.CollisionWithMask(PhysicsLayer.Enemy);
            //     });
            //     foreach (var activityObject in enemies)
            //     {
            //         if (activityObject is Enemy enemy)
            //         {
            //             enemy.ThrowWeapon();
            //         }
            //     }
            // }
        }
        else if (InputManager.Interactive) //互动物体
        {
            TriggerInteractive();
        }
        else if (InputManager.Reload) //换弹
        {
            Reload();
        }

        var meleeAttackFlag = false;
        if (InputManager.MeleeAttack) //近战攻击
        {
            if (StateController.CurrState != PlayerStateEnum.Roll) //不能是翻滚状态
            {
                if (WeaponPack.ActiveItem != null && WeaponPack.ActiveItem.Attribute.CanMeleeAttack)
                {
                    meleeAttackFlag = true;
                    MeleeAttack();
                }
            }
        }
        if (!meleeAttackFlag && InputManager.Fire) //正常开火
        {
            if (StateController.CurrState != PlayerStateEnum.Roll) //不能是翻滚状态
            {
                Attack();
                // //测试用,触发房间内地上的武器开火
                // var weaponArray = AffiliationArea.FindEnterItems(o => o is Weapon);
                // foreach (Weapon activityObject in weaponArray)
                // {
                //     activityObject.Trigger(this);
                // }
            }
        }

        if (InputManager.UseActiveProp) //使用道具
        {
            UseActiveProp();
        }
        else if (InputManager.RemoveProp) //扔掉道具
        {
            ThrowActiveProp();
        }

        if (Input.IsKeyPressed(Key.P)) //测试用, 自杀
        {
            //Hurt(1000, 0);
            Hp = 0;
            Hurt(1000, 0);
        }
        else if (Input.IsKeyPressed(Key.O)) //测试用, 消灭房间内所有敌人
        {
            var enemyList = AffiliationArea.FindIncludeItems(o => o.CollisionWithMask(PhysicsLayer.Enemy));
            foreach (var enemy in enemyList)
            {
                ((Enemy)enemy).Hurt(1000, 0);
            }
        }
        // //测试用
        // if (InputManager.Roll) //鼠标处触发互动物体
        // {
        //     var now = DateTime.Now;
        //     var mousePosition = GetGlobalMousePosition();
        //     var freezeSprites = AffiliationArea.RoomInfo.StaticSprite.CollisionCircle(mousePosition, 25, true);
        //     Debug.Log("检测数量: " + freezeSprites.Count + ", 用时: " + (DateTime.Now - now).TotalMilliseconds);
        //     foreach (var freezeSprite in freezeSprites)
        //     {
        //         var temp = freezeSprite.Position - mousePosition;
        //         freezeSprite.ActivityObject.MoveController.AddForce(temp.Normalized() * 300 * (25f - temp.Length()) / 25f);
        //     }
        // }
    }

    protected override void OnPickUpWeapon(Weapon weapon)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerPickUpWeapon, weapon);
    }

    protected override void OnThrowWeapon(Weapon weapon)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerRemoveWeapon, weapon);
    }

    protected override int OnHandlerHurt(int damage)
    {
        //修改受到的伤害, 每次只受到1点伤害
        return 1;
    }

    protected override void OnHit(int damage, bool realHarm)
    {
        //进入无敌状态
        if (realHarm) //真实伤害
        {
            PlayInvincibleFlashing(RoleState.WoundedInvincibleTime);
        }
        else //护盾抵消掉的
        {
            PlayInvincibleFlashing(RoleState.ShieldInvincibleTime);
        }
    }

    protected override void OnChangeHp(int hp)
    {
        //GameApplication.Instance.Ui.SetHp(hp);
        EventManager.EmitEvent(EventEnum.OnPlayerHpChange, hp);
    }

    protected override void OnChangeMaxHp(int maxHp)
    {
        //GameApplication.Instance.Ui.SetMaxHp(maxHp);
        EventManager.EmitEvent(EventEnum.OnPlayerMaxHpChange, maxHp);
    }

    protected override void ChangeInteractiveItem(CheckInteractiveResult prev, CheckInteractiveResult result)
    {
        if (prev != null && prev.Target.ShowOutline)
        {
            prev.Target.OutlineColor = Colors.Black;
        }
        if (result != null && result.Target.ShowOutline)
        {
            result.Target.OutlineColor = Colors.White;
        }
        //派发互动对象改变事件
        EventManager.EmitEvent(EventEnum.OnPlayerChangeInteractiveItem, result);
    }

    protected override void OnChangeShield(int shield)
    {
        //GameApplication.Instance.Ui.SetShield(shield);
        EventManager.EmitEvent(EventEnum.OnPlayerShieldChange, shield);
    }

    protected override void OnChangeMaxShield(int maxShield)
    {
        //GameApplication.Instance.Ui.SetMaxShield(maxShield);
        EventManager.EmitEvent(EventEnum.OnPlayerMaxShieldChange, maxShield);
    }

    protected override void OnDie()
    {
        StateController.Enable = false;
        GameCamera.Main.SetFollowTarget(null);
        BasisVelocity = Vector2.Zero;
        MoveController.ClearForce();

        //暂停游戏
        GameApplication.Instance.World.Pause = true;
        //弹出结算面板
        GameApplication.Instance.Cursor.SetGuiMode(true);
        UiManager.Open_Settlement();
    }

    protected override void OnPickUpActiveProp(ActiveProp activeProp)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerPickUpProp, activeProp);
    }

    protected override void OnRemoveActiveProp(ActiveProp activeProp)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerRemoveProp, activeProp);
    }

    protected override void OnPickUpBuffProp(BuffProp buffProp)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerPickUpProp, buffProp);
    }

    protected override void OnRemoveBuffProp(BuffProp buffProp)
    {
        EventManager.EmitEvent(EventEnum.OnPlayerRemoveProp, buffProp);
    }

    /// <summary>
    /// 处理角色移动的输入
    /// </summary>
    public void HandleMoveInput(float delta)
    {
        var dir = InputManager.MoveAxis;
        // 移动. 如果移动的数值接近0(是用 摇杆可能出现 方向 可能会出现浮点)，就friction的值 插值 到 0
        // 如果 有输入 就以当前速度，用acceleration 插值到 对应方向 * 最大速度
        if (Mathf.IsZeroApprox(dir.X))
        {
            BasisVelocity = new Vector2(Mathf.MoveToward(BasisVelocity.X, 0, RoleState.Friction * delta), BasisVelocity.Y);
        }
        else
        {
            BasisVelocity = new Vector2(Mathf.MoveToward(BasisVelocity.X, dir.X * RoleState.MoveSpeed, RoleState.Acceleration * delta), BasisVelocity.Y);
        }

        if (Mathf.IsZeroApprox(dir.Y))
        {
            BasisVelocity = new Vector2(BasisVelocity.X, Mathf.MoveToward(BasisVelocity.Y, 0, RoleState.Friction * delta));
        }
        else
        {
            BasisVelocity = new Vector2(BasisVelocity.X, Mathf.MoveToward(BasisVelocity.Y, dir.Y * RoleState.MoveSpeed, RoleState.Acceleration * delta));
        }
    }

    // protected override void DebugDraw()
    // {
    //     base.DebugDraw();
    //     DrawArc(GetLocalMousePosition(), 25, 0, Mathf.Pi * 2f, 20, Colors.Red, 1);
    // }
}