module Opal
  module Spec
    class PhantomFormatter
      def initialize
        @examples        = []
        @failed_examples = []
      end

      def log_green(str)
        `console.log('\\033[32m' + str + '\\033[0m')`
      end

      def log_red(str)
        `console.log('\\033[31m' + str + '\\033[0m')`
      end

      def log(str)
        `console.log(str)`
      end

      def start
        @start_time = Time.now.to_f
      end

      def finish
        time = Time.now.to_f - @start_time
        if @failed_examples.empty?
          log "\nFinished"
          log_green "#{example_count} examples, 0 failures (time taken: #{time})"
          finish_with_code(0)
        else
          log "\nFailures:"
          @failed_examples.each_with_index do |example, idx|
            log "\n  #{idx+1}. #{example.example_group.description} #{example.description}"

            exception = example.exception
            case exception
            when Opal::Spec::ExpectationNotMetError
              output  = exception.message
            else
              output  = "#{exception.class.name}: #{exception.message}\n"
              output += "      #{exception.backtrace.join "\n      "}\n"
            end
            log_red "    #{output}"
          end

          log "\nFinished"
          log_red "#{example_count} examples, #{@failed_examples.size} failures (time taken: #{time})"
          finish_with_code(1)
        end
      end
      
      def finish_with_code(code)
        %x{
          if (typeof(phantom) !== 'undefined') {
            return phantom.exit(code);
          }
          else {
            window.OPAL_SPEC_CODE = code;
          }
        }
      end

      def example_group_started group
        @example_group = group
        @example_group_failed = false
        log "\n#{group.description}"
      end

      def example_group_finished group
      end

      def example_started example
        @examples << example
        @example = example
      end

      def example_failed example
        @failed_examples << example
        @example_group_failed = true
        log_red "  #{example.description}"
      end

      def example_passed example
        log_green "  #{example.description}"
      end

      def example_count
        @examples.size
      end
    end
  end
end