1 files changed, 83 insertions, 0 deletions
diff --git a/scenes/levels/puzzle/puzzle.gd b/scenes/levels/puzzle/puzzle.gd
new file mode 100644
index 0000000..219907f
--- /dev/null
+++ b/scenes/levels/puzzle/puzzle.gd
@@ -0,0 +1,83 @@
+extends Level
+
+
+
+const _button_comp = preload("res://components/button.tscn")
+
+const dim = 4
+
+var parts = []
+onready var order = range(dim*dim)
+
+func _ready():
+	order.shuffle()
+	for i in range(dim*dim-1):
+		var button = _button_comp.instance()
+		var label = Label.new()
+		label.name = "CustomLabel"
+		label.text = str(i+1)
+		label.rect_size = Vector2(32,32)
+		label.rect_position = Vector2(-16,-16)
+		label.align = HALIGN_CENTER
+		label.valign = VALIGN_CENTER
+		button.fixed_width = 30
+		button.add_child(label)
+		button.connect("on_click", self, "on_anybutton_click", [i+1])
+		parts.append(button)
+		$Pieces.add_child(button)
+	_render_state()
+
+func _position_from_index(idx):
+	return Vector2(idx % dim, int(idx / dim))
+
+func on_anybutton_click(piece_name):
+	var pos = _button_position(piece_name)
+	_do_push(pos, _hole_position())
+
+func _render_state():
+	for i in range(dim*dim):
+		if order[i] == 0:
+			continue
+		var piece = parts[order[i]-1]
+		piece.position = _position_from_index(i) * 80
+
+func _check_state():
+	for i in range(dim*dim):
+		if order[i] != i:
+			return
+	finish_level()
+
+
+func _hole_position():
+	return _button_position(0)
+
+func _button_position(piece_name):
+	for i in range(dim*dim):
+		if order[i] == piece_name:
+			return i
+	push_error("No "+str(piece_name)+" present")
+	assert(false)
+
+func _do_push(from, to):
+	if to == from:
+		return
+	var same_row = int(to / dim) == int(from/dim)
+	var same_col = int(to % dim) == int(from % dim)
+	var dir = sign(from - to)
+	if not (same_row or same_col):
+		print("Invalid move")
+		return
+	print("Performing push from ", from, " to ", to, " in direction ", dir)
+	var i = to
+	while i != from:
+		var next_pos
+		if same_row:
+			next_pos = i + 1 * dir
+		else:
+			next_pos = i + dim * dir
+		order[i] = order[next_pos]
+		i = next_pos
+	order[from] = 0
+	_render_state()
+	_check_state()
+