cirnogodot/Scripts/Weapons/Bullet3D.cs

using System.Collections.Generic;
using System.Linq;
using Cirno.Scripts.Components;
using Cirno.Scripts.Controllers;
using Cirno.Scripts.Resources;
using Cirno.Scripts.Utils;
using Godot;

namespace Cirno.Scripts.Weapons;

public partial class Bullet3D : Area3D, IBullet
{
    [Export] public float Speed { get; set; } = 1900f;

    public BulletOwner BulletOwner => _bulletInfo?.Owner ?? BulletOwner.None;

    public float Damage => _bulletInfo?.Damage ?? 1;

    public DamageType DamageType => _bulletInfo?.DamageType ?? DamageType.Neutral;

    protected Vector2 _direction = Vector2.Right;

    private double _elapsedTime = 0f;
    private BulletInfo _bulletInfo;

    public BulletInfo BulletInfo => _bulletInfo;

    private List<ModifierWrapper> _modifiers = new();

    public bool IsGrazed { get; set; } = false;

    public bool IsFrozen { get; private set; } = false;
    public bool Enabled { get; private set; } = false;

    //public float SpriteRotation { get; private set; } = 0f;

    [Signal]
    public delegate void OnDestroyEventHandler();

    [Signal]
    public delegate void InitializedEventHandler();

    private AudioStreamPlayer3D _grazeSound;
    private GpuParticles3D _grazeParticles;

    private CollisionShape3D _collisionShape;

    private Sprite3D _sprite;

    private readonly Vector3 _defaultRotation = new(
        Mathf.DegToRad(-45f),
        Mathf.DegToRad(45f),
        0f
    );

    private Vector3 MakeRotationVectorDegrees(float rotation)
    {
        return new(
            Mathf.DegToRad(-45f),
            Mathf.DegToRad(45f),
            Mathf.DegToRad(rotation)
        );
    }

    private Vector3 MakeRotationVectorRad(float rotation)
    {
        return new(
            Mathf.DegToRad(-45f),
            Mathf.DegToRad(45f),
            rotation
        );
    }

    public override void _Ready()
    {
        _grazeSound = GetNodeOrNull<AudioStreamPlayer3D>("GrazeSound");
        _grazeParticles = GetNodeOrNull<GpuParticles3D>("GrazeParticles");

        _collisionShape = GetNode<CollisionShape3D>("CollisionShape");

        _sprite = GetNodeOrNull<Sprite3D>("Sprite");
    }

    public void Initialize(BulletInfo bulletInfo)
    {
        _bulletInfo = bulletInfo;

        _elapsedTime = 0f;

        this.Speed = bulletInfo.Speed;

        SetSpriteRotationToDirection();
        //SpriteRotation = 0f;

        if (_sprite is not null && bulletInfo.OriginalBulletResource.BulletSprite is not null)
        {
            _sprite.Texture = _bulletInfo.OriginalBulletResource.BulletSprite;
        }

        if (_collisionShape.Shape is SphereShape3D sphere && bulletInfo.OriginalBulletResource.BulletSize > 0)
        {
            sphere.Radius = bulletInfo.OriginalBulletResource.BulletSize;
        }

        IsGrazed = false;
        IsFrozen = false;

        // Need to clone them here
        // _modifiers = _bulletInfo.TimeModifiers.Select(x => x.MakeClone()).ToList();


        // var clonedModifiers = _bulletInfo.TimeModifiers.Select(x => x.MakeClone());
        // _modifiers = clonedModifiers.ToList();

        // Ugly hack to make instances unique
        _modifiers = _bulletInfo.TimeModifiers.Select(x => x.Wrap()).ToList();

        EmitSignalInitialized();
    }

    private void SetSpriteRotationToDirection()
    {
        if (!BulletInfo.Attributes.HasFlag(BulletFlags.Rotateable)) return;
        _sprite?.SetRotation(MakeRotationFromDirection(_direction));
    }

    private Vector3 MakeRotationFromDirection(Vector2 direction)
    {
        // Rotate input by -45 degrees to counter camera isometry
        float cos = Mathf.Cos(-Mathf.Pi / 4f);
        float sin = Mathf.Sin(-Mathf.Pi / 4f);

        Vector2 rotatedDir = new Vector2(
            direction.X * cos - direction.Y * sin,
            direction.X * sin + direction.Y * cos
        );

        //float zRotation = Mathf.Atan2(rotatedDir.Y, rotatedDir.X)/* - Mathf.Pi / 2f*/;

        float zRotation = Mathf.Atan2(-rotatedDir.Y, rotatedDir.X) + Mathf.Pi;

        return MakeRotationVectorRad(zRotation);
    }

    /// <summary>
    /// Enables the bullet, shows the sprite and activates collisions
    /// </summary>
    public void Enable()
    {
        Enabled = true;
        Show();
        if (this._collisionShape is null)
        {
            _collisionShape = GetNode<CollisionShape3D>("CollisionShape");
        }

        _collisionShape.SetDeferred(CollisionShape3D.PropertyName.Disabled, false);
    }

    /// <summary>
    /// Disables the bullet, hides the sprite and disables collisions
    /// </summary>
    public void Disable(bool hideSprite = true)
    {
        Enabled = false;
        if (hideSprite && !BulletInfo.Attributes.HasFlag(BulletFlags.PersistSprite))
        {
            Hide();
        }

        if (this._collisionShape is null)
        {
            _collisionShape = GetNode<CollisionShape3D>("CollisionShape2D");
        }

        _collisionShape.SetDeferred(CollisionShape2D.PropertyName.Disabled, true);
    }

    public void Graze()
    {
        if (!Enabled) return;
        _grazeSound?.Play();
        if (_grazeParticles is not null)
        {
            _grazeParticles.Emitting = true;
        }

        IsGrazed = true;
    }

    private void ApplyTimeModifiers(double delta)
    {
        foreach (var modifier in _modifiers)
        {
            if (_elapsedTime >= modifier.TimeModifier.TimeInSeconds)
            {
                if (!modifier.Applied)
                {
                    modifier.Applied = true;
                    modifier.TimeModifier.Start(this);
                    modifier.Elapsed = 0;
                }
                else
                {
                    modifier.Elapsed += delta;
                }

                modifier.TimeModifier.Update(this, delta, modifier.Elapsed);
            }
        }
    }

    public virtual void RotateBullet(float degrees)
    {
        float radians = Mathf.DegToRad(degrees);
        _direction = _direction.Rotated(radians).Normalized(); // Rotate direction

        if (!BulletInfo.Attributes.HasFlag(BulletFlags.Rotateable)) return;
        SetSpriteRotationToDirection();
        //SetRotation(Rotation + radians);
    }

    public virtual void RotateSpriteDegrees(float degrees)
    {
        if (!BulletInfo.Attributes.HasFlag(BulletFlags.Rotateable)) return;

        var currentRotation = _sprite.GetRotationDegrees().Z;

        _sprite.RotateZ(Mathf.DegToRad(currentRotation + degrees));

        // SpriteRotation = Mathf.DegToRad(Mathf.RadToDeg(SpriteRotation) + degrees);

        //SetRotationDegrees(RotationDegrees + degrees);
    }

    public virtual void RotateSprite(float radians)
    {
        if (!BulletInfo.Attributes.HasFlag(BulletFlags.Rotateable)) return;

        var currentRotation = _sprite.GetRotation().Z;

        var axis = Basis.FromEuler(_defaultRotation).Z;
        _sprite?.Rotate(axis, currentRotation + radians);

        //_sprite.SetRotation(new Vector3());
        //Rotate(axis, radians);
        //_sprite?.Rotate(Vector3.Forward, radians);
        //_sprite?.RotateZ(radians);
        //SetRotation(Rotation + radians);
    }

    public void FacePlayer()
    {
        if (GameController.Instance.PlayerPosition.HasValue)
        {
            _direction = (GameController.Instance.PlayerPosition.Value.ToVector2() - this.GlobalPosition.ToVector2())
                .Normalized();
            RotateBullet(0); // quick hack to rotate lasers
            //LookAt(player.GlobalPosition);
        }
    }


    public void SetDirection(Vector2 direction)
    {
        var normalized = direction.Normalized();

        _direction = normalized;

        if (!BulletInfo.Attributes.HasFlag(BulletFlags.Rotateable)) return;

        SetSpriteRotationToDirection();
        //SetRotation(Mathf.Atan2(normalized.Y, normalized.X) + Mathf.Pi / 2);
    }

    // Called every frame. 'delta' is the elapsed time since the previous frame.
    public override void _Process(double delta)
    {
        if (!Enabled) return;
        _elapsedTime += delta;

        if (_elapsedTime >= _bulletInfo.LifeTime)
        {
            Destroy();
        }

        if (GameController.Instance is not null && GameController.Instance.DebugDraw)
        {
#if !DISABLE_DD3D
            DebugDraw3D.DrawSphere(this.GlobalPosition, this._bulletInfo.OriginalBulletResource.BulletSize,
                Colors.DarkRed);
#endif
        }
    }

    public override void _PhysicsProcess(double delta)
    {
        if (!Enabled) return;
        if (_bulletInfo != null)
        {
            ApplyTimeModifiers(delta);
        }

        if (BulletInfo.Attributes.HasFlag(BulletFlags.Controllable))
        {
            ControlBullet(delta);
        }

        var newPos2D = ((float)(Speed * delta) * _direction);

        this.Position += new Vector3(newPos2D.X, 0, newPos2D.Y);
    }

    private void ControlBullet(double delta)
    {
        if (!Enabled) return;
        var axis = Input.GetAxis("left", "right");

        if (axis != 0)
        {
            float rotationSpeed = 180f; // Degrees per second
            RotateBullet(axis * rotationSpeed * (float)delta);
        }
    }

    private void _on_visible_on_screen_notifier_2d_screen_exited()
    {
        if (!Enabled) return;
        if (!BulletInfo.Attributes.HasFlag(BulletFlags.DieOutOfScreen)) return;
        //Debug.WriteLine("Destroy bullet out of screen");
        Destroy();
    }

    private readonly StringName SolidGroup = "Solid";
    private readonly StringName PermeableGroup = "Permeable";
    private readonly StringName DestroyableGroup = "Destroyable";

    private void _on_body_entered(Node3D body)
    {
        if (body.IsInGroup(DestroyableGroup) && body is IDestructible destructible &&
            CanHit(BulletOwner, destructible.BulletGroup))
        {
            // hit
            destructible.Hit(Damage, DamageType);

            RequestCollisionDestruction();
            return;
        }

        if (body.IsInGroup(SolidGroup) && !body.IsInGroup(PermeableGroup))
        {
            //Debug.WriteLine("Collision");
            RequestCollisionDestruction();
        }
        //// Do not Collide with body for purpose of destroying bullets
        // else if (body.IsInGroup("Destroyable"))
        // {
        // 	Debug.WriteLine("Collision with destroyable object body");
        // 	QueueFree();
        // }
    }

    private void _on_area_entered(Area3D area)
    {
        if (area.IsInGroup("Solid"))
        {
            RequestCollisionDestruction();
            return;
        }

        if (area.IsInGroup("Destroyable") && area is IDestructible destructible &&
            CanHit(BulletOwner, destructible.BulletGroup))
        {
            // hit
            destructible.Hit(Damage, DamageType);

            RequestCollisionDestruction();
        }
    }

    public bool CanHit(BulletOwner bulletOwner, BulletOwner targetGroup)
    {
        // If either is None, it always hits
        if (bulletOwner == BulletOwner.None || targetGroup == BulletOwner.None)
        {
            return true;
        }

        // Otherwise, it hits only if they are different groups
        return bulletOwner != targetGroup;
    }

    public void RequestCollisionDestruction()
    {
        if (!Enabled) return;
        if (_bulletInfo.DestroyOnCollision)
        {
            Destroy();
        }
    }

    private void Destroy()
    {
        if (_bulletInfo?.OriginalBulletResource.DestructionParticlesBullet != null)
        {
            var particleData =
                _bulletInfo?.OriginalBulletResource.DestructionParticlesBullet.MakeBullet(
                    this.GlobalPosition.ToVector2());

            var particle = PoolingManager.Instance.SpawnBullet<Bullet3D>(particleData.OriginalBulletResource);
            particle.GlobalPosition = this.GlobalPosition;
            particle.Initialize(particleData);
            //this.CreateSibling<Node2D>(_bulletInfo.DestructionParticlesScene);

            //particle.Init();
        }

        EmitSignal(Bullet.SignalName.OnDestroy);
        //QueueFree();
        PoolingManager.Instance.DisableBullet(this);
    }

    public void Freeze()
    {
        IsFrozen = true;
        EmitSignal(Bullet.SignalName.OnDestroy);
        //QueueFree();
        PoolingManager.Instance.DisableBullet(this);
    }
}