# frozen_string_literal: true

class EmailsOnPushWorker # rubocop:disable Scalability/IdempotentWorker
  include ApplicationWorker

  data_consistency :always

  sidekiq_options retry: 3

  attr_reader :email, :skip_premailer

  feature_category :source_code_management
  urgency :low
  worker_resource_boundary :cpu
  weight 2

  def perform(project_id, recipients, push_data, options = {})
    options.symbolize_keys!
    options.reverse_merge!(
      send_from_committer_email: false,
      disable_diffs: false
    )
    send_from_committer_email = options[:send_from_committer_email]
    disable_diffs = options[:disable_diffs]

    project = Project.find(project_id)
    before_sha = push_data["before"]
    after_sha = push_data["after"]
    ref = push_data["ref"]
    author_id = push_data["user_id"]

    action =
      if Gitlab::Git.blank_ref?(before_sha)
        :create
      elsif Gitlab::Git.blank_ref?(after_sha)
        :delete
      else
        :push
      end

    diff_refs = nil
    compare = nil
    reverse_compare = false

    if action == :push
      compare = CompareService.new(project, after_sha)
        .execute(project, before_sha)
      diff_refs = compare.diff_refs

      return false if compare.same

      if compare.commits.empty?
        compare = CompareService.new(project, before_sha)
          .execute(project, after_sha)
        diff_refs = compare.diff_refs

        reverse_compare = true

        return false if compare.commits.empty?
      end
    end

    Integrations::EmailsOnPush.valid_recipients(recipients).each do |recipient|
      send_email(
        recipient,
        project_id,
        author_id: author_id,
        ref: ref,
        action: action,
        compare: compare,
        reverse_compare: reverse_compare,
        diff_refs: diff_refs,
        send_from_committer_email: send_from_committer_email,
        disable_diffs: disable_diffs
      )

    # These are input errors and won't be corrected even if Sidekiq retries
    rescue Net::SMTPFatalError, Net::SMTPSyntaxError => e
      logger.info("Failed to send e-mail for project '#{project.full_name}' to #{recipient}: #{e}")
    end
  ensure
    @email = nil
    compare = nil
    GC.start
  end

  private

  def send_email(recipient, project_id, options)
    @email ||= Notify.repository_push_email(project_id, options).tap do |mail|
      Premailer::Rails::Hook.perform(mail)
    end

    current_email = email.dup
    current_email.to = recipient
    current_email.add_message_id
    current_email.header[:skip_premailer] = true
    current_email.deliver_now
  end
end