package demonchime

import "fw"
import "phys"

Platform :: struct {
  handle: Entity_Handle,
  body: phys.Body_Handle,
}

make_platform :: proc(rect: Rect) -> (Entity_Handle, ^Platform) {
  handle := phys.make_body(transmute(phys.Rect)rect, layers = {.Hard})
  return make_entity(&state.platform_list, Platform{body = handle})
}

draw_platforms :: proc() {
  iter := iter_entity_list(state.platform_list)
  color := Color{1, 0, 0, 0.25}
  for p in entity_list_iter(&iter) {
    rect := phys.get_rect(p.body)
    fw.draw_rect(rect.start, rect.size, color = color)
  }
}

clear_platforms :: proc() {
  iter := iter_entity_list(state.platform_list)
  for p in entity_list_iter(&iter) {
    phys.remove_body(p.body)
    delete_entity(&state.platform_list, p.handle)
  }
}

setup_room_collisions :: proc() {
  clear_platforms()

  iterate_room_tiles(current_room.id, proc(x: i32, y: i32, tile_id: u32) {
    tile := tiles[tile_id]

    for coll in tile.collisions {
      make_platform({coll.start + {f32(x), f32(y)}, coll.size})
    }
  })
}

on_room_open_platforms :: proc(room_id: Room_Id) {
  setup_room_collisions()
}

object_spawner_collision :: proc(obj: Object_Resource) {
  make_platform(Rect{obj.pos, obj.size})
}