// /components/activityLogs/activityLogService.js
'use strict';

const ActivityLog = require('./activityLogModel');
const { ACTIVITY_ACTIONS } = require('./activityLogModel');
const { parsePaginationAndSort, calculateMeta } = require('../../utils/pagination');

const SENSITIVE_KEYS = new Set([
  'password',
  'passwordHash',
  'refreshToken',
  'accessToken',
  'token',
  'secret',
  'smtp_pass',
  'SMTP_PASS'
]);

const sanitizeValue = (value, depth = 0) => {
  if (value == null) return value;
  if (depth > 3) return '[truncated]';

  if (Array.isArray(value)) {
    return value.slice(0, 20).map((item) => sanitizeValue(item, depth + 1));
  }

  if (typeof value === 'object') {
    const cleaned = {};
    Object.keys(value).slice(0, 30).forEach((key) => {
      if (SENSITIVE_KEYS.has(key)) {
        cleaned[key] = '[redacted]';
      } else {
        cleaned[key] = sanitizeValue(value[key], depth + 1);
      }
    });
    return cleaned;
  }

  if (typeof value === 'string' && value.length > 300) {
    return `${value.slice(0, 300)}…`;
  }

  return value;
};

const buildDescription = ({ action, resource, actorName, actorUsername, method, path }) => {
  const ACTION_LABELS = {
    create: 'ایجاد',
    update: 'ویرایش',
    delete: 'حذف',
    login: 'ورود',
    logout: 'خروج',
    enroll: 'ثبت‌نام',
    attendance: 'حضور و غیاب',
    upload: 'آپلود',
    retry: 'تلاش مجدد',
    other: 'عملیات'
  };

  const RESOURCE_LABELS = {
    auth: 'احراز هویت',
    users: 'کاربران',
    professors: 'اساتید',
    courses: 'دوره‌ها',
    classes: 'کلاس‌ها',
    sessions: 'جلسات',
    payments: 'پرداخت‌ها',
    roles: 'نقش‌ها',
    notifications: 'اطلاعیه‌ها',
    certificates: 'گواهینامه‌ها',
    files: 'فایل‌ها',
    dashboard: 'داشبورد',
    'contact-inquiries': 'درخواست‌های تماس',
    'activity-logs': 'گزارش فعالیت‌ها'
  };

  const who = actorName || actorUsername || 'سیستم';
  const actionLabel = ACTION_LABELS[action] || action || 'عملیات';
  const resourceLabel = RESOURCE_LABELS[resource] || resource || 'منبع';
  return `${who} — ${actionLabel} روی ${resourceLabel} (${method} ${path})`;
};

const createActivityLog = async (payload) => {
  const doc = {
    ...payload,
    metadata: sanitizeValue(payload.metadata || {}),
    description:
      payload.description ||
      buildDescription(payload)
  };
  return ActivityLog.create(doc);
};

const getAllActivityLogs = async (queryParams = {}) => {
  const { page, limit, skip, sort } = parsePaginationAndSort(queryParams);
  const filter = {};

  if (queryParams.action) {
    filter.action = queryParams.action;
  }

  if (queryParams.resource) {
    filter.resource = queryParams.resource;
  }

  if (queryParams.actor) {
    filter.actor = queryParams.actor;
  }

  if (queryParams.q || queryParams.search) {
    const searchRegex = new RegExp(String(queryParams.q || queryParams.search).replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'i');
    filter.$or = [
      { description: searchRegex },
      { actorUsername: searchRegex },
      { actorName: searchRegex },
      { path: searchRegex },
      { resource: searchRegex },
      { resourceId: searchRegex }
    ];
  }

  const [logs, totalCount] = await Promise.all([
    ActivityLog.find(filter)
      .populate('actor', 'name username')
      .sort(sort)
      .skip(skip)
      .limit(limit)
      .lean(),
    ActivityLog.countDocuments(filter)
  ]);

  return {
    data: logs,
    meta: calculateMeta(totalCount, page, limit)
  };
};

const getActivityActions = () => ACTIVITY_ACTIONS;

module.exports = {
  createActivityLog,
  getAllActivityLogs,
  getActivityActions,
  sanitizeValue,
  buildDescription
};