require 'spec_helper'

describe Elevator do

  let(:elevator) { Elevator.new }

  it 'has a state machine' do
    expect(Finite::StateMachine.machines[Elevator]).to_not be_nil
  end

  context 'states' do
    it 'has a current state' do
      expect(elevator.current_state).to_not be_nil
      expect(elevator.current_state).to eq(:idle)
    end

    it 'has methods to tell whether it is in a state or not' do
      expect(elevator.idle?).to be true
      expect(elevator.moving?).to be false
    end

    it 'can access all states' do
      expect(elevator.states).to_not be_nil
      expect(elevator.states.count).to be(9)
    end
  end

  context 'events' do
    it 'can access all events' do
      expect(elevator.events).to_not be_nil
      expect(elevator.events.count).to be(10)
    end

    it 'can access possible events for a given state' do
      expect(elevator.possible_events).to eq([:prepare])
    end

    it 'has methods to tell whether an event can be performed' do
      expect(elevator.can_prepare?).to be true
      expect(elevator.can_go_up?).to be false
    end

    it 'can perform events' do
      elevator.prepare
      expect(elevator.current_state).to eq(:doors_closing)
      expect(elevator.doors_closing?).to be true
      expect(elevator.idle?).to be false
      expect(elevator.possible_events).to eq([:go_up,:go_down])
      elevator.start
      expect(elevator.current_state).to eq(:doors_closing)
      elevator.go_down
      expect(elevator.can_start?).to be true
      elevator.start
      elevator.approach
      elevator.stop
    end

    it 'will respond to conditions' do
      elevator.broken = true
      elevator.prepare
      expect(elevator.current_state).to eq(:idle)
      elevator.broken = false
      elevator.prepare
      expect(elevator.current_state).to eq(:doors_closing)
    end
  end

end