using GameCore.Attributes;
using GameCore.ECS;
using GameCore.ECS.Interfaces;
using GameCore.Events;
using GameCore.Input;
using GameCore.Physics;
using Attribute = GameCore.Attributes.Attribute;

namespace GameCore.Movement;

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

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

            if (input.IsJumping && characterState.IsOnFloor)
            {
                var jumpHeight = attributes.GetValue(Attribute.JumpHeight);
                velocity.DesiredVelocity.Y = (float)System.Math.Sqrt(2f * world.Config.GravityStrength * jumpHeight);
                world.PublishEvent(new PlayerJumpEvent());
            }
        }
    }
}