extends Node2D

## Currently held structure
var held_construction : Structure
var selected_prototype : Prototype

func _ready() -> void:
	GuiEventBus.construction_selected.connect(on_construction_selected)

func _input(event: InputEvent) -> void:
	if held_construction == null:
		return
	if event.is_action_pressed("plc_place"):
		var zone = try_get_zone(held_construction.global_position)
		if zone != null and held_construction.try_place(zone):
			var facing = held_construction.facing
			held_construction = selected_prototype.scene.instantiate()
			add_child(held_construction)
			held_construction.set_facing(facing)
	if event.is_action_pressed("plc_rotate_up"):
		if held_construction != null:
			held_construction.cycle_up_facing()
	 
	if event.is_action_pressed("plc_cancel"):
		held_construction.queue_free()
		selected_prototype = null

func on_construction_selected(constructible : Prototype):
	if held_construction:
		held_construction.queue_free()
	held_construction = constructible.scene.instantiate()
	add_child(held_construction)
	selected_prototype = constructible
	

func _process(_delta: float) -> void:
	if held_construction == null:
		return
	var mouse_pos = get_global_mouse_position()
	var zone = try_get_zone(mouse_pos)
	if zone and held_construction.can_be_placed(zone):
		global_position = zone.get_placement_position(mouse_pos)
	else:
		global_position = mouse_pos

func try_get_zone(point : Vector2) -> PlacementZone:
	for zone in RuntimePlayerData.build_zones:
		if zone.is_global_point_in_zone(point):
			return zone
	return null