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

class Validateable
  class << self
    def validate(*args, &block)
      args << block if block_given?
      args
    end
  end
end

class StateContextTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    @machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    @state = @machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(@state)
  end
  
  def test_should_have_a_machine
    assert_equal @machine, @state_context.machine
  end
  
  def test_should_have_a_state
    assert_equal @state, @state_context.state
  end
end

class StateContextTransitionTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    @state = @machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(@state)
  end
  
  def test_should_not_allow_except_to
    exception = assert_raise(ArgumentError) { @state_context.transition(:except_to => :idling) }
    assert_equal 'Invalid key(s): except_to', exception.message
  end
  
  def test_should_not_allow_except_from
    exception = assert_raise(ArgumentError) { @state_context.transition(:except_from => :idling) }
    assert_equal 'Invalid key(s): except_from', exception.message
  end
  
  def test_should_not_allow_implicit_transitions
    exception = assert_raise(ArgumentError) { @state_context.transition(:parked => :idling) }
    assert_equal 'Invalid key(s): parked', exception.message
  end
  
  def test_should_not_allow_except_on
    exception = assert_raise(ArgumentError) { @state_context.transition(:except_on => :park) }
    assert_equal 'Invalid key(s): except_on', exception.message
  end
  
  def test_should_require_on_event
    exception = assert_raise(ArgumentError) { @state_context.transition(:to => :idling) }
    assert_equal 'Must specify :on event', exception.message
  end
  
  def test_should_not_allow_missing_from_and_to
    exception = assert_raise(ArgumentError) { @state_context.transition(:on => :ignite) }
    assert_equal 'Must specify either :to or :from state', exception.message
  end
  
  def test_should_not_allow_from_and_to
    exception = assert_raise(ArgumentError) { @state_context.transition(:on => :ignite, :from => :parked, :to => :idling) }
    assert_equal 'Must specify either :to or :from state', exception.message
  end
  
  def test_should_allow_to_state_if_missing_from_state
    assert_nothing_raised { @state_context.transition(:on => :park, :from => :parked) }
  end
  
  def test_should_allow_from_state_if_missing_to_state
    assert_nothing_raised { @state_context.transition(:on => :ignite, :to => :idling) }
  end
  
  def test_should_automatically_set_to_option_with_from_state
    branch = @state_context.transition(:from => :idling, :on => :park)
    assert_instance_of EnumStateMachine::Branch, branch
    
    state_requirements = branch.state_requirements
    assert_equal 1, state_requirements.length
    
    from_requirement = state_requirements[0][:to]
    assert_instance_of EnumStateMachine::WhitelistMatcher, from_requirement
    assert_equal [:parked], from_requirement.values
  end
  
  def test_should_automatically_set_from_option_with_to_state
    branch = @state_context.transition(:to => :idling, :on => :ignite)
    assert_instance_of EnumStateMachine::Branch, branch
    
    state_requirements = branch.state_requirements
    assert_equal 1, state_requirements.length
    
    from_requirement = state_requirements[0][:from]
    assert_instance_of EnumStateMachine::WhitelistMatcher, from_requirement
    assert_equal [:parked], from_requirement.values
  end
  
  def test_should_allow_if_condition
    assert_nothing_raised {@state_context.transition(:to => :idling, :on => :park, :if => :seatbelt_on?)}
  end
  
  def test_should_allow_unless_condition
    assert_nothing_raised {@state_context.transition(:to => :idling, :on => :park, :unless => :seatbelt_off?)}
  end
  
  def test_should_include_all_transition_states_in_machine_states
    @state_context.transition(:to => :idling, :on => :ignite)
    
    assert_equal [:parked, :idling], @machine.states.map {|state| state.name}
  end
  
  def test_should_include_all_transition_events_in_machine_events
    @state_context.transition(:to => :idling, :on => :ignite)
    
    assert_equal [:ignite], @machine.events.map {|event| event.name}
  end
  
  def test_should_allow_multiple_events
    @state_context.transition(:to => :idling, :on => [:ignite, :shift_up])
    
    assert_equal [:ignite, :shift_up], @machine.events.map {|event| event.name}
  end
end

class StateContextWithMatchingTransitionTest < Test::Unit::TestCase
  def setup
    @klass = Class.new
    @machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    @state = @machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(@state)
    @state_context.transition(:to => :idling, :on => :ignite)
    
    @event = @machine.event(:ignite)
    @object = @klass.new
  end
  
  def test_should_be_able_to_fire
    assert @event.can_fire?(@object)
  end
  
  def test_should_have_a_transition
    transition = @event.transition_for(@object)
    assert_not_nil transition
    assert_equal 'parked', transition.from
    assert_equal 'idling', transition.to
    assert_equal :ignite, transition.event
  end
end

class StateContextProxyTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
  end
  
  def test_should_call_class_with_same_arguments
    options = {}
    validation = @state_context.validate(:name, options)
    
    assert_equal [:name, options], validation
  end
  
  def test_should_pass_block_through_to_class
    options = {}
    proxy_block = lambda {}
    validation = @state_context.validate(:name, options, &proxy_block)
    
    assert_equal [:name, options, proxy_block], validation
  end
end

class StateContextProxyWithoutConditionsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @options = @state_context.validate[0]
  end
  
  def test_should_have_options_configuration
    assert_instance_of Hash, @options
  end
  
  def test_should_have_if_option
    assert_not_nil @options[:if]
  end
  
  def test_should_be_false_if_state_is_different
    @object.state = nil
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_true_if_state_matches
    assert @options[:if].call(@object)
  end
end

class StateContextProxyWithIfConditionTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @condition_result = nil
    @options = @state_context.validate(:if => lambda {@condition_result})[0]
  end
  
  def test_should_have_if_option
    assert_not_nil @options[:if]
  end
  
  def test_should_be_false_if_state_is_different
    @object.state = nil
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_false_if_original_condition_is_false
    @condition_result = false
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_true_if_state_matches_and_original_condition_is_true
    @condition_result = true
    assert @options[:if].call(@object)
  end
  
  def test_should_evaluate_symbol_condition
    @klass.class_eval do
      attr_accessor :callback
    end
    
    options = @state_context.validate(:if => :callback)[0]
    
    object = @klass.new
    object.callback = false
    assert !options[:if].call(object)
    
    object.callback = true
    assert options[:if].call(object)
  end
  
  def test_should_evaluate_string_condition
    @klass.class_eval do
      attr_accessor :callback
    end
    
    options = @state_context.validate(:if => '@callback')[0]
    
    object = @klass.new
    object.callback = false
    assert !options[:if].call(object)
    
    object.callback = true
    assert options[:if].call(object)
  end
end

class StateContextProxyWithMultipleIfConditionsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @first_condition_result = nil
    @second_condition_result = nil
    @options = @state_context.validate(:if => [lambda {@first_condition_result}, lambda {@second_condition_result}])[0]
  end
  
  def test_should_be_true_if_all_conditions_are_true
    @first_condition_result = true
    @second_condition_result = true
    assert @options[:if].call(@object)
  end
  
  def test_should_be_false_if_any_condition_is_false
    @first_condition_result = true
    @second_condition_result = false
    assert !@options[:if].call(@object)
    
    @first_condition_result = false
    @second_condition_result = true
    assert !@options[:if].call(@object)
  end
end

class StateContextProxyWithUnlessConditionTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @condition_result = nil
    @options = @state_context.validate(:unless => lambda {@condition_result})[0]
  end
  
  def test_should_have_if_option
    assert_not_nil @options[:if]
  end
  
  def test_should_be_false_if_state_is_different
    @object.state = nil
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_false_if_original_condition_is_true
    @condition_result = true
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_true_if_state_matches_and_original_condition_is_false
    @condition_result = false
    assert @options[:if].call(@object)
  end
  
  def test_should_evaluate_symbol_condition
    @klass.class_eval do
      attr_accessor :callback
    end
    
    options = @state_context.validate(:unless => :callback)[0]
    
    object = @klass.new
    object.callback = true
    assert !options[:if].call(object)
    
    object.callback = false
    assert options[:if].call(object)
  end
  
  def test_should_evaluate_string_condition
    @klass.class_eval do
      attr_accessor :callback
    end
    
    options = @state_context.validate(:unless => '@callback')[0]
    
    object = @klass.new
    object.callback = true
    assert !options[:if].call(object)
    
    object.callback = false
    assert options[:if].call(object)
  end
end

class StateContextProxyWithMultipleUnlessConditionsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @first_condition_result = nil
    @second_condition_result = nil
    @options = @state_context.validate(:unless => [lambda {@first_condition_result}, lambda {@second_condition_result}])[0]
  end
  
  def test_should_be_true_if_all_conditions_are_false
    @first_condition_result = false
    @second_condition_result = false
    assert @options[:if].call(@object)
  end
  
  def test_should_be_false_if_any_condition_is_true
    @first_condition_result = true
    @second_condition_result = false
    assert !@options[:if].call(@object)
    
    @first_condition_result = false
    @second_condition_result = true
    assert !@options[:if].call(@object)
  end
end

class StateContextProxyWithIfAndUnlessConditionsTest < Test::Unit::TestCase
  def setup
    @klass = Class.new(Validateable)
    machine = EnumStateMachine::Machine.new(@klass, :initial => :parked)
    state = machine.state :parked
    
    @state_context = EnumStateMachine::StateContext.new(state)
    @object = @klass.new
    
    @if_condition_result = nil
    @unless_condition_result = nil
    @options = @state_context.validate(:if => lambda {@if_condition_result}, :unless => lambda {@unless_condition_result})[0]
  end
  
  def test_should_be_false_if_if_condition_is_false
    @if_condition_result = false
    @unless_condition_result = false
    assert !@options[:if].call(@object)
    
    @if_condition_result = false
    @unless_condition_result = true
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_false_if_unless_condition_is_true
    @if_condition_result = false
    @unless_condition_result = true
    assert !@options[:if].call(@object)
    
    @if_condition_result = true
    @unless_condition_result = true
    assert !@options[:if].call(@object)
  end
  
  def test_should_be_true_if_if_condition_is_true_and_unless_condition_is_false
    @if_condition_result = true
    @unless_condition_result = false
    assert @options[:if].call(@object)
  end
end