// services/voicePin/resetVoicemailPin.js
// PUT /v1/telephony/config/people/{personId}/voicemail/passcode
//
// Admin API to set a custom voicemail PIN (spark-admin:telephony_config_write).
// Do NOT use people/{id}/features/voicemail/passcode — that path does not exist.
// For org-default reset only: POST people/{id}/features/voicemail/actions/resetPin/invoke

import { logger } from '../../utils/logger.js';
import { generatePin } from './generatePin.js';

const LOG_SCOPE = 'resetvmpin:service';
const VM_PIN_LENGTH = 6;
const MAX_PUT_ATTEMPTS = 5;

function vmPasscodeEndpoint(personId) {
  return `telephony/config/people/${personId}/voicemail/passcode`;
}

/**
 * Reset a user's voicemail mailbox PIN.
 *
 * @param {string} personId
 * @param {object} [opts]
 * @param {object} [opts.webexClient] injectable client for tests
 * @returns {Promise<string>} new PIN (never log this value)
 */
export async function resetVoicemailPin(personId, opts = {}) {
  if (!personId) {
    throw new Error('personId is required');
  }

  const client = opts.webexClient || (await import('../../integrations/webex/WebexClient.js')).default;
  const endpoint = vmPasscodeEndpoint(personId);

  let lastError = null;
  for (let attempt = 0; attempt < MAX_PUT_ATTEMPTS; attempt += 1) {
    const passcode = generatePin({ minLength: VM_PIN_LENGTH, maxLength: VM_PIN_LENGTH });
    try {
      await client.request('PUT', endpoint, { passcode });
      logger(LOG_SCOPE, `Voicemail PIN reset succeeded for person ${personId}`, 'info');
      return passcode;
    } catch (err) {
      lastError = err;
      const status = err?.response?.status;
      if (status === 400 && attempt < MAX_PUT_ATTEMPTS - 1) {
        logger(LOG_SCOPE, `Voicemail PIN rejected for ${personId} (attempt ${attempt + 1}), retrying`, 'warn');
        continue;
      }
      throw err;
    }
  }

  throw lastError || new Error('Voicemail PIN reset failed');
}