/**
 * application service
 *
 * `create` is overridden to fire the acknowledgement e-mail *after* the row is
 * written, mirroring the event-registration service. The send is deliberately
 * not awaited: a slow or failing SMTP call must never turn the application
 * POST into a 502. The mail helper stamps `acknowledgementSentAt` only when
 * the provider accepted the mail, and swallows and logs its own errors.
 */

import { factories } from '@strapi/strapi';

import { sendApplicationAcknowledgement } from '../../../lib/application-mail';

const APPLICATIONS_UID = 'api::application.application';
const LOG_PREFIX = '[application]';

/**
 * The `opportunity` value a client may have sent is a documentId (what the
 * REST API uses for relations), or a legacy numeric id. The Get Involved form
 * sends none at all - an application is not always filed against a call.
 */
const readOpportunityReference = (value: unknown): { documentId?: string; id?: number } | undefined => {
  if (typeof value === 'string' && value.length > 0) {
    return { documentId: value };
  }

  if (typeof value === 'number' && Number.isInteger(value)) {
    return { id: value };
  }

  return undefined;
};

const readCreatedResult = (result: unknown): { documentId?: unknown; email?: unknown } =>
  (typeof result === 'object' && result !== null ? result : {}) as {
    documentId?: unknown;
    email?: unknown;
  };

export default factories.createCoreService(APPLICATIONS_UID, ({ strapi }) => ({
  async create(params: { data?: { opportunity?: unknown } } & Record<string, unknown>) {
    const result = await super.create(params);

    const { documentId, email } = readCreatedResult(result);

    if (typeof documentId === 'string' && documentId.length > 0) {
      if (typeof email === 'string' && email.length > 0) {
        void sendApplicationAcknowledgement({
          strapi,
          to: email,
          applicationDocumentId: documentId,
          opportunityReference: readOpportunityReference(params.data?.opportunity),
        });
      } else {
        strapi.log.warn(
          `${LOG_PREFIX} no email on the created application; acknowledgement skipped.`,
        );
      }
    } else {
      strapi.log.warn(
        `${LOG_PREFIX} no document id on the created application; acknowledgement skipped.`,
      );
    }

    return result;
  },
}));