require 'lucid/step_match'
require 'lucid/step_definition_light'

module Lucid
  module Interface
    module InterfaceMethods
      def around(scenario)
        execute_around(scenario) do
          yield
        end
      end

      def before(scenario)
        begin_scenario(scenario)
        execute_before(scenario)
      end

      def after(scenario)
        execute_after(scenario)
        end_scenario
      end

      def after_configuration(configuration)
        hooks[:after_configuration].each do |hook|
          hook.invoke('AfterConfiguration', configuration)
        end
      end

      def execute_after_step(scenario)
        hooks_for(:after_step, scenario).each do |hook|
          invoke(hook, 'AfterStep', scenario, false)
        end
      end

      def execute_transforms(args)
        args.map do |arg|
          matching_transform = transforms.detect {|transform| transform.match(arg) }
          matching_transform ? matching_transform.invoke(arg) : arg
        end
      end

      def add_hook(phase, hook)
        hooks[phase.to_sym] << hook
        hook
      end

      def clear_hooks
        @hooks = nil
      end

      def add_transform(transform)
        transforms.unshift transform
        transform
      end

      def hooks_for(phase, scenario) #:nodoc:
        hooks[phase.to_sym].select{|hook| scenario.accept_hook?(hook)}
      end

      def unmatched_step_definitions
        available_step_definition_hash.keys - invoked_step_definition_hash.keys
      end

      def available_step_definition(regexp_source, file_colon_line)
        available_step_definition_hash[StepDefinitionLight.new(regexp_source, file_colon_line)] = nil
      end

      def invoked_step_definition(regexp_source, file_colon_line)
        invoked_step_definition_hash[StepDefinitionLight.new(regexp_source, file_colon_line)] = nil
      end

      private

      def available_step_definition_hash
        @available_step_definition_hash ||= {}
      end

      def invoked_step_definition_hash
        @invoked_step_definition_hash ||= {}
      end

      def hooks
        @hooks ||= Hash.new{|h,k| h[k] = []}
      end

      def transforms
        @transforms ||= []
      end

      def execute_around(scenario, &block)
        hooks_for(:around, scenario).reverse.inject(block) do |blk, hook|
          proc do
            invoke(hook, 'Around', scenario, true) do
              blk.call(scenario)
            end
          end
        end.call
      end

      def execute_before(scenario)
        hooks_for(:before, scenario).each do |hook|
          invoke(hook, 'Before', scenario, true)
        end
      end

      def execute_after(scenario)
        hooks_for(:after, scenario).reverse_each do |hook|
          invoke(hook, 'After', scenario, true)
        end
      end

      def invoke(hook, location, scenario, exception_fails_scenario, &block)
        begin
          hook.invoke(location, scenario, &block)
        rescue Exception => exception
          if exception_fails_scenario
            scenario.fail!(exception)
          else
            raise
          end
        end
      end
    end
  end
end