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GameGrid.gd

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+extends Node2D
+class_name GameGrid
+
+var grid_content: Dictionary = {}
+@onready var tile_map: TileMapLayer = get_tree().root.get_node("Node2D/TileMap")
+
+func _ready():
+	var belt1 = preload("res://ConveyorBelt.tscn").instantiate()
+	place_building(belt1, Vector2i(0, 0), Vector2i.RIGHT)
+
+	var belt2 = preload("res://ConveyorBelt.tscn").instantiate()
+	place_building(belt2, Vector2i(1, 0), Vector2i.RIGHT)
+	
+	var belt4 = preload("res://ConveyorBelt.tscn").instantiate()
+	place_building(belt4, Vector2i(3, 0), Vector2i.RIGHT)
+
+	var belt3 = preload("res://ConveyorBelt.tscn").instantiate()
+	place_building(belt3, Vector2i(2, 0), Vector2i.RIGHT)
+
+	var spawner = preload("res://ItemSpawner.tscn").instantiate()
+	spawner.modulate = Color.RED
+	place_building(spawner, Vector2i(0, -1), Vector2i.DOWN)
+
+	var spawner2 = preload("res://ItemSpawner.tscn").instantiate()
+	spawner2.modulate = Color.YELLOW
+	place_building(spawner2, Vector2i(0, 1), Vector2i.UP)
+
+	var sink = preload("res://ItemSink.tscn").instantiate()
+	place_building(sink, Vector2i(2, 1))
+
+func get_content_at_grid(grid_pos: Vector2i) -> Building:
+	return grid_content.get(grid_pos, null)
+
+func place_building(building_node: Building, grid_pos: Vector2i, direction: Vector2i = Vector2i.ZERO) -> bool:
+	if grid_content.has(grid_pos) and grid_content[grid_pos] != null:
+		print("grid_pos at %s not free." % grid_pos)
+		building_node.queue_free()
+		return false
+		
+	# Internal setter
+	building_node.current_grid_pos = grid_pos
+	building_node.direction = direction
+
+	var world_center = tile_map.map_to_local(grid_pos) + (Vector2.ONE * tile_map.rendering_quadrant_size) / 2
+	building_node.position = world_center
+	add_child(building_node)
+	grid_content[grid_pos] = building_node
+	print("placed %s at %s" % [building_node.name, grid_pos])
+	return true
+
+func remove_building(grid_pos: Vector2i) -> bool:
+	if grid_content.has(grid_pos):
+		var building_to_remove = grid_content[grid_pos]
+		grid_content.erase(grid_pos)
+
+		if building_to_remove is ConveyorBelt and not building_to_remove.items_on_belt.is_empty():
+			for item_data in building_to_remove.items_on_belt:
+				item_data.item.queue_free()
+				
+		building_to_remove.queue_free()
+		print("removed building from %s" % grid_pos)
+		return true
+		
+	print("no building to remove at %s" % grid_pos)
+	return false