danmayer/coverband

# frozen_string_literal: true

####
# Thanks for all the help SimpleCov https://github.com/colszowka/simplecov
# initial version pulled into Coverband from Simplecov 12/04/2018
#
# An array of  SourceFile instances with additional collection helper
# methods for calculating coverage across them etc.
####
module Coverband
  module Utils
    class FileList < Array
      # Returns the count of lines that have coverage
      def covered_lines
        return 0.0 if empty?

        map { |f| f.covered_lines.count }.inject(:+)
      end

      # Returns the count of lines that have been missed
      def missed_lines
        return 0.0 if empty?

        map { |f| f.missed_lines.count }.inject(:+)
      end

      # Returns the count of lines that are not relevant for coverage
      def never_lines
        return 0.0 if empty?

        map { |f| f.never_lines.count }.inject(:+)
      end

      # Returns the count of skipped lines
      def skipped_lines
        return 0.0 if empty?

        map { |f| f.skipped_lines.count }.inject(:+)
      end

      # Computes the coverage based upon lines covered and lines missed for each file
      # Returns an array with all coverage percentages
      def covered_percentages
        map(&:covered_percent)
      end

      # Returns the overall amount of relevant lines of code across all files in this list
      def lines_of_code
        covered_lines + missed_lines
      end

      # Computes the coverage based upon lines covered and lines missed
      # @return [Float]
      def covered_percent
        return 100.0 if empty? || lines_of_code.zero?

        Float(covered_lines * 100.0 / lines_of_code)
      end

      # Computes the coverage based upon lines covered and lines missed, formatted
      # @return [Float]
      def formatted_covered_percent
        covered_percent.round(2)
      end

      # Computes the strength (hits / line) based upon lines covered and lines missed
      # @return [Float]
      def covered_strength
        return 0.0 if empty? || lines_of_code.zero?

        Float(map { |f| f.covered_strength * f.lines_of_code }.inject(:+) / lines_of_code)
      end

      def first_seen_at
        map(&:first_updated_at).reject { |el| el.is_a?(String) }.min
      end
    end
  end
end