MovementTests/scenes/player_controller/components/weapon/WeaponSystem.cs

using System;
using Gamesmiths.Forge.Core;
using Gamesmiths.Forge.Effects;
using Gamesmiths.Forge.Events;
using Gamesmiths.Forge.Tags;
using Godot;
using GodotStateCharts;
using Movementtests.interfaces;
using Movementtests.scenes.player_controller.components.weapon;
using Movementtests.systems.damage;
using Movementtests.tools;

namespace Movementtests.systems;

public record struct WeaponLandPayload(int Damage, bool IsCritical);

[GlobalClass, Icon("res://assets/ui/IconGodotNode/node_3D/icon_sword.png")]
public partial class WeaponSystem : RigidBody3D, IDamageDealer, IForgeEntity
{
    [Signal]
    public delegate void WeaponThrownEventHandler();
    
    [Signal]
    public delegate void WeaponRetrievedEventHandler();
    
    [Export]
    public RDamage RDamage { get; set; }
    [Export(PropertyHint.Range, "0,100,1,or_greater")]
    public float ThrowForce { get; set; } = 1f;
    [Export(PropertyHint.Range, "0,0.2,0.01,or_greater")]
    public float StraightThrowDuration { get; set; } = 0.1f;
    
    public EntityAttributes Attributes { get; set; } = null!;
    public EntityTags Tags { get; set; } = null!;
    public EffectsManager EffectsManager { get; set; } = null!;
    public EntityAbilities Abilities { get; set; } = null!;
    public EventManager Events { get; set; } = null!;
    
    private StateChart       _weaponState = null!;
    public StateChartState  InHandState = null!;
    public StateChartState  FlyingState = null!;
    public StateChartState  PlantedState = null!;
    private ShapeCast3D _dashCast3D = null!;
    
    private Transform3D _startTransform;
    private Vector3 _startMeshRotation;

    private Vector3 _throwDirection;
    public Vector3 PlantLocation { get; set; }
    public Vector3 PlantNormal { get; set; }
    public Node? PlantObject { get; set; }

    public MeshInstance3D WeaponLocationIndicator { get; set; } = null!;
    public StandardMaterial3D WeaponLocationIndicatorMaterial { get; set; } = null!;
    public MeshInstance3D WeaponMesh { get; set; } = null!;

    public Tag WeaponLandTag;

    public void Init()
    {
        _weaponState = StateChart.Of(GetNode("StateChart"));
        InHandState = StateChartState.Of(GetNode("StateChart/Root/InHand"));
        FlyingState = StateChartState.Of(GetNode("StateChart/Root/Flying"));
        PlantedState = StateChartState.Of(GetNode("StateChart/Root/Planted"));

        WeaponLocationIndicator = GetNode<MeshInstance3D>("WeaponLocationIndicator");
        WeaponLocationIndicator.Visible = false;
        WeaponLocationIndicatorMaterial = (WeaponLocationIndicator.GetActiveMaterial(0) as StandardMaterial3D)!;
        
        WeaponMesh = GetNode<MeshInstance3D>("Weapon");
        _startMeshRotation = WeaponMesh.Rotation;

        _startTransform = Transform;
        Freeze = true;
        Visible = false;
        
        var tagsManager = ForgeManager.GetTagsManager(this);
        var cuesManager = ForgeManager.GetCuesManager(this);
        var baseTags = new TagContainer(
            tagsManager,
            [
                Tag.RequestTag(tagsManager, "weapon")
            ]);
        
        Attributes = new EntityAttributes(new WeaponAttributeSet());
        Tags = new EntityTags(baseTags);
        EffectsManager = new EffectsManager(this, cuesManager);
        Abilities = new(this);
        Events = new();
        
        WeaponLandTag = Tag.RequestTag(tagsManager, "events.weapon.land");

        BodyEntered += OnThrownWeaponReachesGround;

        InHandState.StateExited += WeaponLeft;
        InHandState.StateEntered += WeaponBack;
    }

    public void WeaponLeft()
    {
        Visible = true;
        // WeaponLocationIndicator.Visible = true;
        EmitSignalWeaponThrown();
    }

    public void WeaponBack()
    {
        Visible = false;
        // WeaponLocationIndicator.Visible = false;
        EmitSignalWeaponRetrieved();
    }

    public void PlaceWeaponForTutorial(Vector3 location)
    {
        _weaponState.SendEvent("plant");
        Freeze = true;
        GlobalPosition = location;
        PlantLocation = location;
    }

    public void ThrowWeapon(Vector3 end, bool hasHit, Vector3 collisionLocation, Vector3 collisionNormal, Node collidedObject)
    {
        _weaponState.SendEvent("throw");

        // WeaponLocationIndicatorMaterial.StencilColor = new Color(1f, 1f, 1f);
        
        _throwDirection = (end - GlobalPosition).Normalized();
        PlantLocation = collisionLocation;
        PlantNormal = collisionNormal;
        LookAt(end);
        
        
        var tween = GetTree().CreateTween();
        tween.TweenProperty(this, "global_position", end, StraightThrowDuration);
        if (hasHit)
        {
            PlantObject = collidedObject;
            tween.Finished += PlantWeaponInWall;
        }
        else
            tween.Finished += ThrowWeaponOnCurve;
    }

    public void RaiseWeaponLandEvent(IForgeEntity? victim = null)
    {
        Events.Raise(new EventData<WeaponLandPayload>
        {
            EventTags = WeaponLandTag.GetSingleTagContainer(),
            Source = this,
            Target = victim,
            EventMagnitude = 25f,
            Payload = new WeaponLandPayload(Damage: 25, IsCritical: true)
        });
    }

    public void PlantInEnemy(Node3D enemy)
    {
        GetTree().GetRoot().CallDeferred(Node.MethodName.RemoveChild, this);
        enemy.CallDeferred(Node.MethodName.AddChild, this);

        if (enemy is IForgeEntity victim) RaiseWeaponLandEvent(victim);
        else RaiseWeaponLandEvent();

        if (enemy is IDamageable damageable)
        {
            damageable.TakeDamage(new DamageRecord(GlobalPosition, RDamage));
        }
    }

    public void RethrowWeapon()
    {
        _weaponState.SendEvent("throw");
        _throwDirection = Vector3.Up;
        ThrowWeaponOnCurve();
    }

    public void ThrowWeaponOnCurve()
    {
        Freeze = false;
        ApplyImpulse(_throwDirection * ThrowForce);
    }

    public void PlantWeaponInWall()
    {
        _weaponState.SendEvent("plant");

        Freeze = true;
        WeaponMesh.Rotation = _startMeshRotation;
        
        // WeaponLocationIndicatorMaterial.StencilColor = new Color(1f, 0.2f, 0.2f);
        if (PlantObject is Node3D node)
        {
            PlantInEnemy(node);
        }
        else RaiseWeaponLandEvent();
        
        CallDeferred(Node3D.MethodName.SetGlobalPosition, PlantLocation);
        CallDeferred(Node3D.MethodName.LookAt, GlobalTransform.Origin + PlantNormal, Vector3.Up, true);
    }

    public void OnThrownWeaponReachesGround(Node other)
    {
        PlantObject = other;
        PlantWeaponInWall();
    }

    public void ResetWeapon()
    {
        _weaponState.SendEvent("recover");
        Transform = _startTransform;
        Freeze = true;
        Visible = false;
    }
    
    public override void _IntegrateForces(PhysicsDirectBodyState3D state)
    {
        base._IntegrateForces(state);
        
        if (!Freeze && state.GetContactCount() > 0)
        {
            PlantLocation = state.GetContactLocalPosition(0);
            PlantNormal = state.GetContactLocalNormal(0);
        }
    }

    public override void _Process(double delta)
    {
        if (!FlyingState.Active) return;
        
        WeaponMesh.Rotation = new Vector3(WeaponMesh.Rotation.X, WeaponMesh.Rotation.Y + (float) delta * 100, WeaponMesh.Rotation.Z);
        //LookAt(GlobalTransform.Origin + LinearVelocity.Normalized(), Vector3.Up, false);
    }

    public bool IsPlantedUnderPlatform()
    {
        return PlantedState.Active && GlobalRotation.X > 1 && Math.Abs(GlobalRotation.Y) > 1;
    }

    public bool IsPlantedInWall()
    {
        return PlantedState.Active && Math.Abs(GlobalRotation.X) + Math.Abs(GlobalRotation.Z) < 0.3;
    }
}