import fs from 'node:fs';
import path from 'node:path';
import crypto from 'node:crypto';
import { Router } from 'express';
import multer from 'multer';
import config from '../config.js';
import { requireAuth } from '../auth/middleware.js';
import { getProfile, setAvatarPath, updateProfile, getChipsBalance, adjustChipsBalance, resetChipsBalance } from './service.js';

fs.mkdirSync(config.uploads.dir, { recursive: true });

const storage = multer.diskStorage({
  destination(_req, _file, cb) {
    cb(null, config.uploads.dir);
  },
  filename(req, file, cb) {
    const ext = path.extname(file.originalname).toLowerCase().slice(0, 8) || '';
    const random = crypto.randomBytes(8).toString('hex');
    cb(null, `u${req.user.id}-${Date.now()}-${random}${ext}`);
  },
});

const upload = multer({
  storage,
  limits: { fileSize: config.uploads.maxSizeMb * 1024 * 1024 },
  fileFilter(_req, file, cb) {
    if (!config.uploads.allowedMime.includes(file.mimetype)) {
      return cb(new Error('Unsupported image type.'));
    }
    cb(null, true);
  },
});

const router = Router();

router.get('/', requireAuth, (req, res) => {
  res.json({ profile: getProfile(req.user.id) });
});

router.patch('/', requireAuth, (req, res) => {
  const { displayName, bio } = req.body ?? {};
  const profile = updateProfile(req.user.id, { displayName, bio });
  res.json({ profile });
});

router.post('/avatar', requireAuth, (req, res, next) => {
  upload.single('avatar')(req, res, (err) => {
    if (err) return res.status(400).json({ error: err.message });
    if (!req.file) return res.status(400).json({ error: 'No file uploaded.' });
    const publicPath = `/uploads/${path.basename(req.file.path)}`;
    const profile = setAvatarPath(req.user.id, publicPath);
    res.json({ profile });
  });
});

router.get('/chips', requireAuth, (req, res) => {
  res.json({ chips: getChipsBalance(req.user.id) });
});

router.post('/chips/adjust', requireAuth, (req, res) => {
  const { delta } = req.body ?? {};
  if (typeof delta !== 'number' || !Number.isInteger(delta)) {
    return res.status(400).json({ error: 'delta must be an integer.' });
  }
  const chips = adjustChipsBalance(req.user.id, delta);
  res.json({ chips });
});

router.post('/chips/reset', requireAuth, (req, res) => {
  try {
    const chips = resetChipsBalance(req.user.id);
    res.json({ chips });
  } catch (err) {
    res.status(err.status ?? 500).json({ error: err.message });
  }
});

export default router;