class Cucumber::StepMother

def after(scenario) #:nodoc:
  @current_scenario = nil
  return if options[:dry_run]
  @programming_languages.each do |programming_language|
    programming_language.after(scenario)
  end
end

def after_configuration(configuration) #:nodoc
  @programming_languages.each do |programming_language|
    programming_language.after_configuration(configuration)
  end
end

def after_step #:nodoc:
  return if options[:dry_run]
  @programming_languages.each do |programming_language|
    programming_language.execute_after_step(@current_scenario)
  end
end

def announce(msg)
  @visitor.announce(msg)
end

def before(scenario) #:nodoc:
  return if options[:dry_run] || @current_scenario
  @current_scenario = scenario
  @programming_languages.each do |programming_language|
    programming_language.before(scenario)
  end
end

def before_and_after(scenario, skip_hooks=false) #:nodoc:
  before(scenario) unless skip_hooks
  yield scenario
  after(scenario) unless skip_hooks
  scenario_visited(scenario)
end

def best_matches(step_name, step_matches) #:nodoc:
  no_groups      = step_matches.select {|step_match| step_match.args.length == 0}
  max_arg_length = step_matches.map {|step_match| step_match.args.length }.max
  top_groups     = step_matches.select {|step_match| step_match.args.length == max_arg_length }
  if no_groups.any?
    longest_regexp_length = no_groups.map {|step_match| step_match.text_length }.max
    no_groups.select {|step_match| step_match.text_length == longest_regexp_length }
  elsif top_groups.any?
    shortest_capture_length = top_groups.map {|step_match| step_match.args.inject(0) {|sum, c| sum + c.length } }.min
    top_groups.select {|step_match| step_match.args.inject(0) {|sum, c| sum + c.length } == shortest_capture_length }
  else
    top_groups
  end
end

def embed(file, mime_type)
  @visitor.embed(file, mime_type)
end

def initialize
  @unsupported_programming_languages = []
  @programming_languages = []
  @language_map = {}
  load_natural_language('en')
  @current_scenario = nil
end

def invoke(step_name, multiline_argument=nil)
  begin
    step_match(step_name).invoke(multiline_argument)
  rescue Exception => e
    e.nested! if Undefined === e
    raise e
  end
end

def invoke_steps(steps_text, natural_language)
  ored_keywords = natural_language.step_keywords.join("|")
  after_keyword = natural_language.space_after_keyword ? ' ' : ''
  # TODO Gherkin:
  # This a bit hacky and fragile. When we move to Gherkin we should replace this entire method body
  # with a call to the parser - parsing the body of a scenario. We may need to put the parser/policy in the
  # appropriate state (the same state it's in after parsing a Scenario: line).
  steps_text.strip.split(/(?=^\s*(?:#{ored_keywords}))/).map { |step| step.strip }.each do |step|
    output = step.match(/^\s*(#{ored_keywords})#{after_keyword}([^\n]+)(\n.*)?$/m)
    action, step_name, table_or_string = output[1], output[2], output[3]
    if table_or_string.to_s.strip =~ /^\|/
      table_or_string = table(table_or_string) 
    elsif table_or_string.to_s.strip =~ /^"""/
      table_or_string = py_string(table_or_string.gsub(/^\n/, ""))
    end
    args = [step_name, table_or_string].compact
    invoke(*args)
  end
end

def load_code_file(step_def_file)
  if programming_language = programming_language_for(step_def_file)
    log.debug("  * #{step_def_file}\n")
    programming_language.load_code_file(step_def_file)
  else
    log.debug("  * #{step_def_file} [NOT SUPPORTED]\n")
  end
end

def load_code_files(step_def_files)
  log.debug("Code:\n")
  step_def_files.each do |step_def_file|
    load_code_file(step_def_file)
  end
  log.debug("\n")
end

def load_natural_language(lang)
  Parser::NaturalLanguage.get(self, lang)
end

def load_plain_text_features(feature_files)
  features = Ast::Features.new
  start = Time.new
  log.debug("Features:\n")
  feature_files.each do |f|
    feature_file = FeatureFile.new(f)
    feature = feature_file.parse(self, options)
    if feature
      features.add_feature(feature)
      log.debug("  * #{f}\n")
    end
  end
  duration = Time.now - start
  log.debug("Parsing feature files took #{format_duration(duration)}\n\n")
  features
end

def load_programming_language(ext)
  return @language_map[ext] if @language_map[ext]
  programming_language_class = constantize("Cucumber::#{ext.capitalize}Support::#{ext.capitalize}Language")
  programming_language = programming_language_class.new(self)
  programming_language.alias_adverbs(@adverbs || [])
  @programming_languages << programming_language
  @language_map[ext] = programming_language
  programming_language
end

def log
  @log ||= Logger.new(STDOUT)
end

def max_step_definition_length #:nodoc:
  @max_step_definition_length ||= step_definitions.map{|step_definition| step_definition.text_length}.max
end

def options
  @options ||= {}
end

def programming_language_for(step_def_file) #:nodoc:
  if ext = File.extname(step_def_file)[1..-1]
    return nil if @unsupported_programming_languages.index(ext)
    begin
      load_programming_language(ext)
    rescue LoadError => e
      log.debug("Failed to load '#{ext}' programming language for file #{step_def_file}: #{e.message}\n")
      @unsupported_programming_languages << ext
      nil
    end
  else
    nil
  end
end

def py_string(string_with_triple_quotes, file=nil, line_offset=0)
  @py_string_parser ||= Parser::PyStringParser.new
  @py_string_parser.parse_or_fail(string_with_triple_quotes, file, line_offset).to_s
end

def register_adverbs(adverbs) #:nodoc:
  @adverbs ||= []
  @adverbs += adverbs
  @adverbs.uniq!
  @programming_languages.each do |programming_language|
    programming_language.alias_adverbs(@adverbs)
  end
end

def scenario_visited(scenario) #:nodoc:
  scenarios << scenario unless scenarios.index(scenario)
end

def scenarios(status = nil) #:nodoc:
  @scenarios ||= []
  if(status)
    @scenarios.select{|scenario| scenario.status == status}
  else
    @scenarios
  end
end

def snippet_text(step_keyword, step_name, multiline_arg_class) #:nodoc:
  load_programming_language('rb') if unknown_programming_language?
  @programming_languages.map do |programming_language|
    programming_language.snippet_text(step_keyword, step_name, multiline_arg_class)
  end.join("\n")
end

def step_match(step_name, name_to_report=nil) #:nodoc:
  matches = @programming_languages.map do |programming_language| 
    programming_language.step_matches(step_name, name_to_report)
  end.flatten
  raise Undefined.new(step_name) if matches.empty?
  matches = best_matches(step_name, matches) if matches.size > 1 && options[:guess]
  raise Ambiguous.new(step_name, matches, options[:guess]) if matches.size > 1
  matches[0]
end

def step_visited(step) #:nodoc:
  steps << step unless steps.index(step)
end

def steps(status = nil) #:nodoc:
  @steps ||= []
  if(status)
    @steps.select{|step| step.status == status}
  else
    @steps
  end
end

def table(text_or_table, file=nil, line_offset=0)
  if Array === text_or_table
    Ast::Table.new(text_or_table)
  else
    @table_parser ||= Parser::TableParser.new
    @table_parser.parse_or_fail(text_or_table.strip, file, line_offset)
  end
end

def unknown_programming_language?
  @programming_languages.empty?
end

def unmatched_step_definitions
  @programming_languages.map do |programming_language| 
    programming_language.unmatched_step_definitions
  end.flatten
end