SupaLidlGame/Characters/Character.cs

using Godot;
using SupaLidlGame.Extensions;
using SupaLidlGame.Items;
using SupaLidlGame.Utils;
using SupaLidlGame.State.Character;

namespace SupaLidlGame.Characters
{
    public partial class Character : CharacterBody2D, IFaction
    {
        [Export]
        public float Speed { get; protected set; } = 32.0f;

        [Export]
        public float Friction { get; protected set; } = 4.0f;

        [Export]
        public float Mass
        {
            get => _mass;
            set
            {
                if (value > 0)
                    _mass = value;
            }
        }

        protected float _mass = 1.0f;

        public Vector2 NetImpulse { get; set; } = Vector2.Zero;

        public Vector2 Direction { get; set; } = Vector2.Zero;

        public Vector2 Target { get; set; } = Vector2.Zero;

        [Export]
        public float Health
        {
            get => _health;
            set
            {
                if (!IsAlive && value < 0)
                {
                    return;
                }

                _health = value;
                if (_health <= 0)
                {
                    Die();
                }
            }
        }

        public bool IsAlive => Health > 0;

        protected float _health = 100f;

        public double StunTime { get; set; }

        [Export]
        public AnimatedSprite2D Sprite { get; set; }

        [Export]
        public Inventory Inventory { get; set; }

        [Export]
        public CharacterStateMachine StateMachine { get; set; }

        [Export]
        public ushort Faction { get; set; }

        public override void _Process(double delta)
        {
            if (StateMachine != null)
            {
                StateMachine.Process(delta);
            }

            Sprite.FlipH = Target.X < 0;
            DrawTarget();
        }

        public override void _Input(InputEvent @event)
        {
            if (StateMachine != null)
            {
                StateMachine.Input(@event);
            }
        }

        public override void _PhysicsProcess(double delta)
        {
            if (StateMachine != null)
            {
                StateMachine.PhysicsProcess(delta);
            }
        }

        /// <summary>
        /// Modify the <c>Character</c>'s velocity
        /// </summary>
        public virtual void ModifyVelocity()
        {
            if (StunTime > 0)
            {
                Velocity *= 0.25f;
            }
        }

        public virtual void Die()
        {
            GD.Print("lol died");
            QueueFree();
        }

        public void ApplyImpulse(Vector2 impulse, bool resetVelocity = false)
        {
            // delta p = F delta t
            if (resetVelocity)
                Velocity = Vector2.Zero;
            NetImpulse += impulse / Mass;
        }

        public virtual void Stun(float time)
        {
            StunTime += time;
        }

        protected void DrawTarget()
        {
            Vector2 target = Target;
            float angle = Mathf.Atan2(target.Y, Mathf.Abs(target.X));
            Vector2 scale = Inventory.Scale;
            if (target.X < 0)
            {
                scale.Y = -1;
                angle = Mathf.Pi - angle;
            }
            else
            {
                scale.Y = 1;
            }
            Inventory.Scale = scale;
            Inventory.Rotation = angle;
        }

        public void UseCurrentItem()
        {
            if (StunTime > 0)
            {
                GD.Print("tried to use weapon but stunned");
                return;
            }

            if (Inventory.SelectedItem is Weapon weapon)
            {
                weapon.Use();
            }
        }

        public virtual void _on_hurtbox_received_damage(
            float damage,
            Character inflictor,
            float knockback,
            Vector2 knockbackOrigin = default,
            Vector2 knockbackVector = default)
        {
            Health -= damage;

            // create damage text
            var textScene = GD.Load<PackedScene>("res://UI/FloatingText.tscn");
            var instance = textScene.Instantiate<UI.FloatingText>();
            instance.Text = Mathf.Round(damage).ToString();
            instance.GlobalPosition = GlobalPosition;
            this.GetAncestor<TileMap>().AddChild(instance);

            // apply knockback
            Vector2 knockbackDir = knockbackVector;
            if (knockbackDir == default)
            {
                if (knockbackOrigin == default)
                {
                    knockbackOrigin = inflictor.GlobalPosition;
                }

                knockbackDir = knockbackOrigin.DirectionTo(GlobalPosition);
            }

            ApplyImpulse(knockbackDir.Normalized() * knockback);

            // play damage animation
            var anim = GetNode<AnimationPlayer>("FlashAnimation");
            if (anim != null)
            {
                anim.Stop();
                anim.Play("Hurt");
            }

            // if anyone involved is a player, shake their screen
            Player plr = inflictor as Player ?? this as Player;
            if (plr is not null)
            {
                plr.Camera.Shake(1, 0.4f);
            }

            if (this.GetNode("HurtSound") is AudioStreamPlayer2D sound)
            {
                // very small pitch deviation
                sound.At(GlobalPosition).WithPitchDeviation(0.125f).Play();
            }
        }
    }
}