require 'helper'

class GitTest < Thor
  default_task :test

  method_option :mapping, aliases: '-m', type: :string, required: true, desc: "Path to test<->code mapping file"
  method_option :change_recommendation, aliases: '-c', type: :string, required: true ,desc: "Path to change recommendation"
  method_option :output, aliases: '-o', enum: ['csv','dot'], default: 'csv', desc: "The output format of the test recommendation"
  desc "test", ""
  def test
    begin
      mapping = CSV.read(options[:mapping], headers: true)
      change_rec = CSV.read(options[:change_recommendation], headers: true)
    rescue CSV::MalformedCSVError => e
      $stderr.puts "An error occured when parsing the mapping file:\n #{e}"
    end

    test_plan = Hash.new
    covered = Set.new
    uniq_impacted_items = change_rec.map {|row| row["rhs"]}.to_set

    change_rec.each do |row|
      lhs = row["lhs"]
      rhs = row["rhs"]
      support = row["support"].to_r.to_f
      mapping.each do |mapping_row|
        pattern = Regexp.new(mapping_row["pattern"], Regexp::IGNORECASE)
        test = mapping_row["test"]
        if rhs =~ pattern
          covered << rhs
          if test_plan[test].nil?
            test_plan[test] = {impact: support, covers: 1}
          else
            test_plan[test][:impact] += support
            test_plan[test][:covers] += 1
          end
        end
      end
    end                          
    # print warnings to stderr if any
    if covered.size < uniq_impacted_items.size
      uncovered = uniq_impacted_items - covered
      if uncovered.size < 11
        $stderr.puts "The following potentially impacted items were not covered by at least 1 test:\n #{uncovered.to_a.join("\n")}"
      else
        $stderr.puts "#{uncovered.size} potentially impacted items were not covered by at least 1 test. The first 10 were: \n #{uncovered.take(10).join("\n")}"
      end
    end

    # print testplan to stdout
    $stdout.puts "test,impact,covers"
    test_plan.sort_by {|k,v| -v[:impact]}.each do |test,relevance|
      $stdout.puts "#{test},#{relevance[:impact]},#{relevance[:covers]}"
    end
  end

end