module MetricFu

  def self.generate_flog_report
    Flog::Generator.generate_report
    system("open #{Flog::Generator.metric_dir}/index.html") if open_in_browser?
  end

  module Flog
    class Generator < Base::Generator
      def generate_report
        @base_dir = self.class.metric_dir
        pages = []
        flog_results.each do |filename|
          page = Base.parse(open(filename, "r") { |f| f.read })
          if page
            page.filename = filename
            pages << page
          end
        end
        generate_pages(pages)
      end

      def generate_pages(pages)
        pages.each do |page|
          unless MetricFu::MD5Tracker.file_already_counted?(page.filename)
            generate_page(page)
          end
        end
        save_html(ERB.new(File.read(template_file)).result(binding))
      end

      def generate_page(page)
        save_html(page.to_html, page.path)
      end

      def flog_results
        Dir.glob("#{@base_dir}/**/*.txt")
      end

      def self.template_name
        "flog"
      end
    end

    SCORE_FORMAT = "%0.2f"

    class Base
      METHOD_LINE_REGEX = /([A-Za-z]+#.*):\s\((\d+\.\d+)\)/
      OPERATOR_LINE_REGEX = /\s+(\d+\.\d+):\s(.*)$/

      class << self

        def parse(text)
          score = text[/\w+ = (\d+\.\d+)/, 1]
          return nil unless score
          page = Page.new(score)

          text.each_line do |method_line|
           if match = method_line.match(METHOD_LINE_REGEX)
              page.scanned_methods << ScannedMethod.new(match[1], match[2])
            end

            if match = method_line.match(OPERATOR_LINE_REGEX)
              return if page.scanned_methods.empty?
              page.scanned_methods.last.operators << Operator.new(match[1], match[2])
            end
          end
          page
        end

      end
    end

    class Page < MetricFu::Base::Generator
      attr_accessor :filename, :score, :scanned_methods

      def initialize(score, scanned_methods = [])
        @score = score.to_f
        @scanned_methods = scanned_methods
      end

      def path
        @path ||= File.basename(filename, ".txt") + '.html'
      end

      def to_html
        ERB.new(File.read(template_file)).result(binding)
      end

      def average_score
        return 0 if scanned_methods.length == 0
        sum = 0
        scanned_methods.each do |m|
          sum += m.score
        end
        sum / scanned_methods.length
      end

      def highest_score
        scanned_methods.inject(0) do |highest, m|
          m.score > highest ? m.score : highest
        end
      end

      def template_name
        'flog_page'
      end
    end

    class Operator
      attr_accessor :score, :operator

      def initialize(score, operator)
        @score = score.to_f
        @operator = operator
      end
    end

    class ScannedMethod
      attr_accessor :name, :score, :operators

      def initialize(name, score, operators = [])
        @name = name
        @score = score.to_f
        @operators = operators
      end
    end
  end
end