discourse/app/controllers/admin/email_templates_controller.rb

# frozen_string_literal: true

class Admin::EmailTemplatesController < Admin::AdminController
  def self.email_keys
    @email_keys ||= %w[
      custom_invite_forum_mailer
      custom_invite_mailer
      invite_forum_mailer
      invite_mailer
      invite_password_instructions
      new_version_mailer
      new_version_mailer_with_notes
      system_messages.backup_failed
      system_messages.backup_succeeded
      system_messages.bulk_invite_failed
      system_messages.bulk_invite_succeeded
      system_messages.csv_export_failed
      system_messages.csv_export_succeeded
      system_messages.download_remote_images_disabled
      system_messages.email_error_notification
      system_messages.email_reject_auto_generated
      system_messages.email_reject_bad_destination_address
      system_messages.email_reject_empty
      system_messages.email_reject_invalid_access
      system_messages.email_reject_parsing
      system_messages.email_reject_reply_key
      system_messages.email_reject_screened_email
      system_messages.email_reject_topic_closed
      system_messages.email_reject_topic_not_found
      system_messages.email_reject_unrecognized_error
      system_messages.email_reject_user_not_found
      system_messages.email_revoked
      system_messages.pending_users_reminder
      system_messages.post_hidden
      system_messages.post_hidden_again
      system_messages.queued_posts_reminder
      system_messages.restore_failed
      system_messages.restore_succeeded
      system_messages.silenced_by_staff
      system_messages.spam_post_blocked
      system_messages.too_many_spam_flags
      system_messages.unsilenced
      system_messages.user_automatically_silenced
      system_messages.welcome_invite
      system_messages.welcome_user
      system_messages.welcome_staff
      test_mailer
      user_notifications.account_created
      user_notifications.admin_login
      user_notifications.confirm_new_email
      user_notifications.email_login
      user_notifications.forgot_password
      user_notifications.notify_old_email
      user_notifications.set_password
      user_notifications.signup
      user_notifications.signup_after_approval
      user_notifications.suspicious_login
      user_notifications.user_invited_to_private_message_pm
      user_notifications.user_invited_to_private_message_pm_group
      user_notifications.user_invited_to_topic
      user_notifications.user_linked
      user_notifications.user_mentioned
      user_notifications.user_posted
      user_notifications.user_posted_pm
      user_notifications.user_quoted
      user_notifications.user_replied
    ]
  end

  def show
  end

  def update
    et = params[:email_template]
    key = params[:id]
    raise Discourse::NotFound if self.class.email_keys.exclude?(params[:id])

    subject_result = update_key("#{key}.subject_template", et[:subject])
    body_result = update_key("#{key}.text_body_template", et[:body])

    error_messages = []
    if subject_result[:error_messages].present?
      error_messages << format_error_message(subject_result, "subject")
    end
    if body_result[:error_messages].present?
      error_messages << format_error_message(body_result, "body")
    end

    if error_messages.blank?
      log_site_text_change(subject_result)
      log_site_text_change(body_result)

      render_serialized(
        key,
        AdminEmailTemplateSerializer,
        root: "email_template",
        rest_serializer: true,
      )
    else
      TranslationOverride.upsert!(
        I18n.locale,
        "#{key}.subject_template",
        subject_result[:old_value],
      )
      TranslationOverride.upsert!(I18n.locale, "#{key}.text_body_template", body_result[:old_value])

      render_json_error(error_messages)
    end
  end

  def revert
    key = params[:id]
    raise Discourse::NotFound if self.class.email_keys.exclude?(params[:id])

    revert_and_log("#{key}.subject_template", "#{key}.text_body_template")
    render_serialized(
      key,
      AdminEmailTemplateSerializer,
      root: "email_template",
      rest_serializer: true,
    )
  end

  def index
    render_serialized(
      self.class.email_keys,
      AdminEmailTemplateSerializer,
      root: "email_templates",
      rest_serializer: true,
      overridden_keys: overridden_keys,
    )
  end

  private

  def update_key(key, value)
    old_value = I18n.t(key)

    unless old_value.is_a?(Hash)
      translation_override = TranslationOverride.upsert!(I18n.locale, key, value)
    end

    { key: key, old_value: old_value, error_messages: translation_override&.errors&.full_messages }
  end

  def revert_and_log(*keys)
    old_values = {}
    keys.each { |key| old_values[key] = I18n.t(key) }

    TranslationOverride.revert!(I18n.locale, keys)

    keys.each do |key|
      old_value = old_values[key]
      new_value = I18n.t(key)
      StaffActionLogger.new(current_user).log_site_text_change(key, new_value, old_value)
    end
  end

  def log_site_text_change(update_result)
    new_value = I18n.t(update_result[:key])
    StaffActionLogger.new(current_user).log_site_text_change(
      update_result[:key],
      new_value,
      update_result[:old_value],
    )
  end

  def format_error_message(update_result, attribute_key)
    attribute = I18n.t("admin_js.admin.customize.email_templates.#{attribute_key}")
    message = update_result[:error_messages].join("<br>")
    I18n.t("errors.format_with_full_message", attribute: attribute, message: message)
  end

  def overridden_keys
    TranslationOverride.where(locale: I18n.locale).pluck(:translation_key)
  end
end