/***********************************************************************************************************************************************************************
 * File Name: user_activity.controller.js  (admin)
 * Type of Program: Controller
 * Description: Admin-only view of the user_activity log.
 *
 *   GET /api/admin/activity              → global paginated activity feed (all users)
 *   GET /api/admin/users/:id/activity    → paginated activity for a single user
 *
 * Author: Kenneth Obsequio (@lash0000)
 * Date Created: Jun. 21, 2026
 ***********************************************************************************************************************************************************************/
const { Op }           = require('sequelize');
const mdl_UserActivity = require('../../models/users/user_activity.mdl');
const mdl_Users        = require('../../models/users/users.mdl');
const R                = require('../../utils/response.util');

const USER_ATTRS = [
  'user_id', 'email', 'acc_type',
  // full_name from JSONB — resolved in the association below
];

// ─── Shared query builder ─────────────────────────────────────────────────────

function buildWhere(query, extraWhere = {}) {
  const where = { ...extraWhere };

  if (query.action)
    where.action = query.action;

  if (query.from || query.to) {
    where.created_at = {};
    if (query.from) where.created_at[Op.gte] = new Date(query.from);
    if (query.to)   where.created_at[Op.lte] = new Date(query.to);
  }

  return where;
}

// ─── GET GLOBAL ACTIVITY FEED ─────────────────────────────────────────────────

exports.getActivity = async (req, res) => {
  try {
    const page   = Math.max(1, parseInt(req.query.page)  || 1);
    const limit  = Math.min(100, parseInt(req.query.limit) || 20);
    const offset = (page - 1) * limit;

    const where = buildWhere(req.query);

    const { count, rows } = await mdl_UserActivity.findAndCountAll({
      where,
      include: [{
        model:      mdl_Users,
        as:         'user',
        attributes: ['user_id', 'email', 'acc_type', 'personal_info'],
      }],
      order:  [['created_at', 'DESC']],
      limit,
      offset,
    });

    const data = rows.map(formatRow);

    return R.success(res, 'Activity feed retrieved.', {
      total:      count,
      page,
      totalPages: Math.ceil(count / limit),
      activities: data,
    });
  } catch (err) {
    console.error('[ADMIN][GET ACTIVITY FEED]', err);
    return R.error(res, 'Could not retrieve activity feed.', 500);
  }
};

// ─── GET PER-USER ACTIVITY ────────────────────────────────────────────────────

exports.getUserActivity = async (req, res) => {
  try {
    const { id } = req.params;
    if (!id || id === 'undefined') return R.error(res, 'Invalid User ID.', 400);

    const user = await mdl_Users.findByPk(id, { attributes: ['user_id'] });
    if (!user) return R.error(res, 'User not found.', 404);

    const page   = Math.max(1, parseInt(req.query.page)  || 1);
    const limit  = Math.min(100, parseInt(req.query.limit) || 20);
    const offset = (page - 1) * limit;

    const where = buildWhere(req.query, { user_id: id });

    const { count, rows } = await mdl_UserActivity.findAndCountAll({
      where,
      order:  [['created_at', 'DESC']],
      limit,
      offset,
    });

    return R.success(res, 'User activity retrieved.', {
      total:      count,
      page,
      totalPages: Math.ceil(count / limit),
      activities: rows,
    });
  } catch (err) {
    console.error('[ADMIN][GET USER ACTIVITY]', err);
    return R.error(res, 'Could not retrieve user activity.', 500);
  }
};

// ─── Helpers ──────────────────────────────────────────────────────────────────

function formatRow(row) {
  const r    = row.toJSON();
  const info = r.user?.personal_info;
  return {
    activity_id: r.activity_id,
    user_id:     r.user_id,
    email:       r.user?.email          ?? null,
    full_name:   info?.name?.full_name  ?? null,
    avatar_url:  info?.avatar?.url      ?? null,
    acc_type:    r.user?.acc_type       ?? null,
    action:      r.action,
    entity_type: r.entity_type,
    entity_id:   r.entity_id,
    details:     r.details,
    created_at:  r.created_at,
  };
}