module Cucumber::CiEnvironment

def detect(ci_environment, env, file_reader)
  url = evaluate(ci_environment['url'], env)
  return nil if url.nil?
  result = {
    name: ci_environment['name'],
    url: url,
    buildNumber: evaluate(ci_environment['buildNumber'], env),
  }
  detected_git = detect_git(ci_environment, env, file_reader)
  result[:git] = detected_git if detected_git
  result
end

def detect_ci_environment(env, file_reader = IO.method(:read))
  ci_environments = JSON.parse(file_reader.call(CI_ENVIRONMENTS_PATH))
  ci_environments.each do |ci_environment|
    detected = detect(ci_environment, env, file_reader)
    return detected unless detected.nil?
  end
  nil
end

def detect_git(ci_environment, env, file_reader)
  revision = detect_revision(ci_environment, env, file_reader)
  return nil if revision.nil?
  remote = evaluate(ci_environment['git']['remote'], env)
  return nil if remote.nil?
  git_info = {
    remote: remove_userinfo_from_url(remote),
    revision: revision,
  }
  tag = evaluate(ci_environment['git']['tag'], env)
  branch = evaluate(ci_environment['git']['branch'], env)
  git_info[:tag] = tag if tag
  git_info[:branch] = branch if branch
  git_info
end

def detect_revision(ci_environment, env, file_reader)
  if env['GITHUB_EVENT_NAME'] == 'pull_request'
    raise StandardError('GITHUB_EVENT_PATH not set') unless env['GITHUB_EVENT_PATH']
    event = JSON.parse(file_reader.call(env['GITHUB_EVENT_PATH']))
    raise StandardError("No after property in #{env['GITHUB_EVENT_PATH']}:\n#{JSON.pretty_generate(event)}") unless event['after']
    return event['after']
  end
  return evaluate(ci_environment['git']['revision'], env)
end

def remove_userinfo_from_url(value)
  return nil if value.nil?
  begin
    uri = URI(value)
    uri.userinfo = ''
    uri.to_s
  rescue StandardError
    value
  end
end