extends Node
class_name TK_GridController

## Composable 4-way grid controller.
## Depends on placement below some Node2D below some GridContext.

# todo: Turn-based logic context.

signal moved(p_new_cell_position)

var _grid_context_cache: Node2D

func _enter_tree() -> void:
    _grid_context_cache = _get_grid_context()

func _input(p_event: InputEvent):
    var direction := InputUtils.input_event_to_4way_direction(p_event)
    if direction == Vector2.ZERO:
        return

    var cell = _grid_context_cache.position_to_cell_position(get_parent().position)
    var new_cell = cell + direction
    if _grid_context_cache.try_moving(get_parent(), new_cell):
        emit_signal("moved", new_cell)

func _get_grid_context() -> Node:
    var current := self.get_parent().get_parent()
    while current.name != "GridContext":
        current = current.get_parent()
    return current