using GameCore.ECS;
using GameCore.ECS.Interfaces;
using GameCore.Physics;

namespace GameCore.Movement;

public class GravitySystem : ISystem
{
    public void Update(World world, float deltaTime)
    {
        var entities = world.GetEntitiesWith<VelocityComponent>();
        foreach (var entity in entities)
        {
            var velocity = world.GetComponent<VelocityComponent>(entity);
            var characterState = world.GetComponent<CharacterStateComponent>(entity);

            if (velocity == null || characterState == null)
                continue;

            if (!characterState.IsOnFloor) velocity.DesiredVelocity.Y -= world.Config.GravityStrength * deltaTime;
        }
    }
}