module Pact::Matchers::Messages

def actual_desc actual
  actual.nil? ? 'nil' : '"' + actual + '"'
end

def colorize_if_enabled formatted_diff, color_enabled
  if color_enabled
    # RSpec wraps each line in the failure message with failure_color, turning it red.
    # To ensure the lines in the diff that should be white, stay white, put an
    # ANSI reset at the start of each line.
    formatted_diff.split("\n").collect{ |line| ::Term::ANSIColor.reset + line }.join("\n")
  else
    formatted_diff
  end
end

def expected_desc expected
  case expected
  when NilClass then "be nil"
  else
    "match #{expected.inspect}"
  end
end

def match_header_failure_message header_name, expected, actual
  "Expected header \"#{header_name}\" to #{expected_desc(expected)}, but was #{actual_desc(actual)}"
end

def match_term_failure_message diff, actual, diff_formatter, color_enabled
  message = "Actual: #{(String === actual ? actual : actual.to_json)}\n\n"
  formatted_diff = diff_formatter.call(diff)
  message + colorize_if_enabled(formatted_diff, color_enabled)
end