class_name Grid
extends Node2D


signal kace_broken
signal kace_damaged
signal has_moved


enum State {
	DONE,
	MOVING,
}


const Brick = preload("res://component/entity/brick/Brick.tscn")

const BRICK_SIZE = 20


export (float) var moving_time = 1.0


var current_state = State.DONE

var current_row = 1


onready var tween = $MoveDown


func generate_and_move() -> void:
	generate_row()
	current_state = State.MOVING
	start_moving()


func generate_row() -> void:
	for x in range(10):
		generate_cell(x, -current_row)


func generate_cell(x: int, y: int) -> void:
	if randi() % 2 : # 50% of generation
		build_brick(x, y)


func build_brick(x: int, y: int) -> void:
	var brick = Brick.instance()
	brick.setup(x, y, current_row * current_row)
	brick.connect("kace_broken", self, "_on_Brick_kace_broken")
	brick.connect("kace_damaged", self, "_on_Brick_kace_damaged")
	add_child(brick)


func start_moving() -> void:
	current_row += 1
	tween.interpolate_property(self, "position", position,
		position + Vector2(0, BRICK_SIZE), moving_time,
		Tween.TRANS_QUART, Tween.EASE_IN_OUT)
	tween.start()


func finish_moving() -> void:
	current_state = State.DONE
	emit_signal("has_moved")


func _ready() -> void:
	randomize()
	generate_and_move()


func _on_Launcher_is_full() -> void:
	generate_and_move()


func _on_MoveDown_tween_all_completed() -> void:
	finish_moving()


func _on_Brick_kace_broken() -> void:
	emit_signal("kace_broken")


func _on_Brick_kace_damaged() -> void:
	emit_signal("kace_damaged")