class ValidateProjects
  def checkEligiblityForReactorization (project_directory_path)
    puts "Checking Eligibility for Reactorization"
    reactorHandler = ReactorHandler.new
    basePomCordinate = 'com.cerner.maven:maven-base-pom'
    modulePomPaths =  reactorHandler.fetchGidArtifactIdAndVersionFromChildModule(project_directory_path,false)
    ancestorStrings = Array.new
    indexCounter = 0
    modulePomPaths.each do |modulePomFile|
      eachPomPath = modulePomFile.sub("/pom.xml","")
      Dir.chdir(eachPomPath){
        `mvn org.apache.maven.plugins:maven-dependency-plugin:3.1.1:display-ancestors > ancestors.txt`
        File.open('ancestors.txt').each do |line|
          if line.start_with?("[INFO] Ancestor POMs:")
            ancestorsString = line.sub("[INFO] Ancestor POMs: ","")
            puts ancestorsString
            ancestorStrings.push(ancestorsString)
          else
            if line.start_with?("[FATAL] Non-resolvable parent POM") or line.start_with?("[ERROR]")
              raise `mvn org.apache.maven.plugins:maven-dependency-plugin:3.1.1:display-ancestors`
            end
          end
        end
      }
    end
    ancestorStrings.each do |ancestorString|
      if ancestorString.include?(basePomCordinate)
        indexCounter = indexCounter + 1
      end
    end

    if ancestorStrings.length == 0
      puts "No projects have ancestors POM\. Good to go!!!"
    else
      if indexCounter == ancestorStrings.length and indexCounter == modulePomPaths.length
        mbpHash = Hash.new
        nonMbpHash = Hash.new
        grandMbpHash = Hash.new
        ancestorStrings.each do |ancestorString|
          ancestors = ancestorString.split(' <- ')
          if ancestors[0].include?(basePomCordinate)
            mbpHash[ancestors[0]] = 1
          else
            nonMbpHash[ancestors[0]] = 1
          end
          if ancestors.length > 1
            ancestors.each_with_index do |ancstor,index|
              if index > 0 and ancstor.include?(basePomCordinate)
                grandMbpHash[ancstor] = 1
              end
            end
          end
        end
        if mbpHash.length == 1
          puts "All projects have MBP as their immediate ancestors with identical version. Good to go !!!"
		   return mbpHash
        else
          if nonMbpHash.length == 1 and grandMbpHash.length == 1
            puts "All projects have identical non MBP as their immediate ancestors as well as identical MBP as their grand ancestor . Good to go !!!"
			 return nonMbpHash
          else
            raise "All projects do not have identical immediate ancestors and MBP as their one of the ancestor. Aborting the reactorization !!!"
          end
        end
      elsif indexCounter == 0
        puts "No ancestors are MBP. Good to go!!!"
      else
        raise "Not all projects have MBP as their ancestors but few of them have\. Not eligible for reactorization. Aborting the reactorization"
      end
    end
  end
end