require File.expand_path(File.dirname(__FILE__) + '/../test_helper')

class PathCollectionByDefaultTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked
    
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine)
  end
  
  def test_should_have_an_object
    assert_equal @object, @paths.object
  end
  
  def test_should_have_a_machine
    assert_equal @machine, @paths.machine
  end
  
  def test_should_have_a_from_name
    assert_equal :parked, @paths.from_name
  end
  
  def test_should_not_have_a_to_name
    assert_nil @paths.to_name
  end
  
  def test_should_have_no_from_states
    assert_equal [], @paths.from_states
  end
  
  def test_should_have_no_to_states
    assert_equal [], @paths.to_states
  end
  
  def test_should_have_no_events
    assert_equal [], @paths.events
  end
  
  def test_should_have_no_paths
    assert @paths.empty?
  end
end

class PathCollectionTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @object = @klass.new
  end
  
  def test_should_raise_exception_if_invalid_option_specified
    exception = assert_raise(ArgumentError) {EnumStateMachine::PathCollection.new(@object, @machine, :invalid => true)}
    assert_equal 'Invalid key(s): invalid', exception.message
  end
  
  def test_should_raise_exception_if_invalid_from_state_specified
    exception = assert_raise(IndexError) {EnumStateMachine::PathCollection.new(@object, @machine, :from => :invalid)}
    assert_equal ':invalid is an invalid name', exception.message
  end
  
  def test_should_raise_exception_if_invalid_to_state_specified
    exception = assert_raise(IndexError) {EnumStateMachine::PathCollection.new(@object, @machine, :to => :invalid)}
    assert_equal ':invalid is an invalid name', exception.message
  end
end

class PathCollectionWithPathsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling, :first_gear
    @machine.event :ignite do
      transition :parked => :idling
    end
    @machine.event :shift_up do
      transition :idling => :first_gear
    end
    
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine)
  end
  
  def test_should_enumerate_paths
    assert_equal [[
      EnumStateMachine::Transition.new(@object, @machine, :ignite, :parked, :idling),
      EnumStateMachine::Transition.new(@object, @machine, :shift_up, :idling, :first_gear)
    ]], @paths
  end
  
  def test_should_have_a_from_name
    assert_equal :parked, @paths.from_name
  end
  
  def test_should_not_have_a_to_name
    assert_nil @paths.to_name
  end
  
  def test_should_have_from_states
    assert_equal [:parked, :idling], @paths.from_states
  end
  
  def test_should_have_to_states
    assert_equal [:idling, :first_gear], @paths.to_states
  end
  
  def test_should_have_no_events
    assert_equal [:ignite, :shift_up], @paths.events
  end
end

class PathWithGuardedPathsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling, :first_gear
    @machine.event :ignite do
      transition :parked => :idling, :if => lambda {false}
    end
    
    @object = @klass.new
    @object.state = 'parked'
  end
  
  def test_should_not_enumerate_paths_if_guard_enabled
    assert_equal [], EnumStateMachine::PathCollection.new(@object, @machine)
  end
  
  def test_should_enumerate_paths_if_guard_disabled
    paths = EnumStateMachine::PathCollection.new(@object, @machine, :guard => false)
    assert_equal [[
      EnumStateMachine::Transition.new(@object, @machine, :ignite, :parked, :idling)
    ]], paths
  end
end

class PathCollectionWithDuplicateNodesTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling
    @machine.event :shift_up do
      transition :parked => :idling, :idling => :first_gear
    end
    @machine.event :park do
      transition :first_gear => :idling
    end
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine)
  end
  
  def test_should_not_include_duplicates_in_from_states
    assert_equal [:parked, :idling, :first_gear], @paths.from_states
  end
  
  def test_should_not_include_duplicates_in_to_states
    assert_equal [:idling, :first_gear], @paths.to_states
  end
  
  def test_should_not_include_duplicates_in_events
    assert_equal [:shift_up, :park], @paths.events
  end
end

class PathCollectionWithFromStateTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling, :first_gear
    @machine.event :park do
      transition :idling => :parked
    end
    
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine, :from => :idling)
  end
  
  def test_should_generate_paths_from_custom_from_state
    assert_equal [[
      EnumStateMachine::Transition.new(@object, @machine, :park, :idling, :parked)
    ]], @paths
  end
  
  def test_should_have_a_from_name
    assert_equal :idling, @paths.from_name
  end
end

class PathCollectionWithToStateTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling
    @machine.event :ignite do
      transition :parked => :idling
    end
    @machine.event :shift_up do
      transition :parked => :idling, :idling => :first_gear
    end
    @machine.event :shift_down do
      transition :first_gear => :idling
    end
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine, :to => :idling)
  end
  
  def test_should_stop_paths_once_target_state_reached
    assert_equal [
      [EnumStateMachine::Transition.new(@object, @machine, :ignite, :parked, :idling)],
      [EnumStateMachine::Transition.new(@object, @machine, :shift_up, :parked, :idling)]
    ], @paths
  end
end

class PathCollectionWithDeepPathsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass)
    @machine.state :parked, :idling
    @machine.event :ignite do
      transition :parked => :idling
    end
    @machine.event :shift_up do
      transition :parked => :idling, :idling => :first_gear
    end
    @machine.event :shift_down do
      transition :first_gear => :idling
    end
    @object = @klass.new
    @object.state = 'parked'
    
    @paths = EnumStateMachine::PathCollection.new(@object, @machine, :to => :idling, :deep => true)
  end
  
  def test_should_allow_target_to_be_reached_more_than_once_per_path
    assert_equal [
      [
        EnumStateMachine::Transition.new(@object, @machine, :ignite, :parked, :idling)
      ],
      [
        EnumStateMachine::Transition.new(@object, @machine, :ignite, :parked, :idling),
        EnumStateMachine::Transition.new(@object, @machine, :shift_up, :idling, :first_gear),
        EnumStateMachine::Transition.new(@object, @machine, :shift_down, :first_gear, :idling)
      ],
      [
        EnumStateMachine::Transition.new(@object, @machine, :shift_up, :parked, :idling)
      ],
      [
        EnumStateMachine::Transition.new(@object, @machine, :shift_up, :parked, :idling),
        EnumStateMachine::Transition.new(@object, @machine, :shift_up, :idling, :first_gear),
        EnumStateMachine::Transition.new(@object, @machine, :shift_down, :first_gear, :idling)
      ]
    ], @paths
  end
end