package ecs 

import "core:log"

import program_config "../config"

PhysicsSystem :: struct {
   using _: SystemBase,
}

physics_system_update :: proc(physics_system: ^PhysicsSystem, coordinator: ^Coordinator, dt: f32) {
    entities_to_delete := make([dynamic]EntityID)
    defer delete(entities_to_delete)

    for entity_id in physics_system.entities {
        rigid_body := coordinator_get_component(coordinator, RigidBodyComponent, entity_id)
        transform := coordinator_get_component(coordinator, TransformComponent, entity_id)
        gravity := coordinator_get_component(coordinator, GravityComponent, entity_id)

        transform.position += rigid_body.velocity * dt
        rigid_body.velocity += gravity.force * dt

        if transform.position.y < program_config.Y_DESPAWN_CUTOFF {
            append(&entities_to_delete, entity_id)
        }
    }

    for entity in entities_to_delete {
        coordinator_destroy_entity(coordinator, entity)
    }
}