const { asyncController } = require('../utils/asyncController');
const { getMemoryLog, clearMemoryLog } = require('../utils/errorLogger');
const { env } = require('../configs/env');

const parsePage = (val, fallback) => {
  const n = parseInt(String(val || ''), 10);
  return Number.isInteger(n) && n > 0 ? n : fallback;
};

const getErrorLogs = asyncController(async (req, res) => {
  const page = parsePage(req.query.page, 1);
  const pageSize = Math.min(100, parsePage(req.query.pageSize, 50));

  let items;
  let total;

  if (env.isProduction) {
    const ErrorLog = require('../models/ErrorLog');
    const skip = (page - 1) * pageSize;
    [total, items] = await Promise.all([
      ErrorLog.countDocuments(),
      ErrorLog.find().sort({ timestamp: -1 }).skip(skip).limit(pageSize).lean(),
    ]);
  } else {
    const all = getMemoryLog();
    total = all.length;
    const skip = (page - 1) * pageSize;
    items = all.slice(skip, skip + pageSize);
  }

  res.json({
    success: true,
    items,
    total,
    page,
    pageSize,
    totalPages: Math.max(1, Math.ceil((total || 0) / pageSize)),
  });
});

const clearErrorLogs = asyncController(async (req, res) => {
  clearMemoryLog();

  if (env.isProduction) {
    const ErrorLog = require('../models/ErrorLog');
    await ErrorLog.deleteMany({});
  }

  res.json({ success: true, cleared: true });
});

module.exports = { getErrorLogs, clearErrorLogs };