extends Node
class_name GameState

# https://github.com/GDQuest/godot-demos/blob/master/2018/04-24-finite-state-machine/player_v2/state_machine.gd
# http://www.gameprogrammingpatterns.com/state.html

enum State { MAIN, WINNING, GAME_OVER }
var transitions = {
	State.MAIN : [ State.WINNING ],
	State.WINNING : [ State.GAME_OVER ],
	State.GAME_OVER : [ State.MAIN ]
}

signal state_changed(previous, current)

export(State) var current_state = State.MAIN

func current_state_name() -> String:
	return State.keys()[current_state]

func transition_to(state):
	assert(state in transitions[current_state])
	var previous_state = current_state
	current_state = state
	emit_signal("state_changed", previous_state, current_state)