require 'pmdtester'
require 'time'
require 'logger'

@logger = Logger.new(STDOUT)

def run_pmdtester
  Dir.chdir('..') do
    argv = ['-r', './pmd', '-b', "#{ENV['TRAVIS_BRANCH']}", '-p', 'FETCH_HEAD', '-m', 'online', '-a']
    begin
      runner = PmdTester::Runner.new(argv)
      @new_errors, @removed_errors, @new_violations, @removed_violations, @new_configerrors, @removed_configerrors = runner.run
      upload_report
    rescue StandardError => e
      warn("Running pmdtester failed, this message is mainly used to remind the maintainers of PMD.")
      @logger.error "Running pmdtester failed: #{e.inspect}"
    end
  end
end

def upload_report
  Dir.chdir('target/reports') do
    tar_filename = "pr-#{ENV['TRAVIS_PULL_REQUEST']}-diff-report-#{Time.now.strftime("%Y-%m-%dT%H-%M-%SZ")}.tar"
    unless Dir.exist?('diff/')
      message("No java rules are changed!", sticky: true)
      return
    end

    `tar -cf #{tar_filename} diff/`
    report_url = `curl -u #{ENV['CHUNK_TOKEN']} -T #{tar_filename} https://chunk.io`
    if $?.success?
      @logger.info "Successfully uploaded #{tar_filename} to chunk.io"

      # set value of sticky to true and the message is kept after new commits are submited to the PR
      message("This changeset introduces #{@new_violations} new violations, #{@new_errors} new errors and " +
              "#{@new_configerrors} new configuration errors,\n" +
              "removes #{@removed_violations} violations, #{@removed_errors} errors and " +
              "#{@removed_configerrors} configuration errors.\n" +
              "[Full report](#{report_url.chomp}/diff/index.html)", sticky: true)
    else
      @logger.error "Error while uploading #{tar_filename} to chunk.io: #{report_url}"
      warn("Uploading the diff report failed, this message is mainly used to remind the maintainers of PMD.")
    end
  end
end

# Perform regression testing
can_merge = github.pr_json['mergeable']
if can_merge
  run_pmdtester
else
  warn("This PR cannot be merged yet.", sticky: false)
end

# vim: syntax=ruby