const express = require('express');
const fs = require('fs');
const path = require('path');
const router = express.Router();
const fileUpload = require('express-fileupload');
const { loggers } = require('winston');
const ncp = require('ncp');
const util = require('util');
const configFile = fs.readFileSync(path.join(__dirname, '../../../data', 'setup.json'), 'utf-8')
const config = JSON.parse(configFile);
const bodyParser = require('body-parser');
const jwt = require('jsonwebtoken');
const authMiddleware = require('../../../Middlewares/authMiddleware');
const { getUserData, getSetupData } = require('../../../Middlewares/watcherMiddleware');
const { logger, logRequestInfo, ErrorLogger, authLogger } = require('../../../config/logs');

let setupData = getSetupData();
let userData = getUserData();
router.use(bodyParser.json());

/**
 * @swagger
 * /dpanel/upload?token={token}:
 *   post:
 *     security:
 *       - bearerAuth: []
 *     tags:
 *       - File
 *     summary: Upload a file
 *     description: This route allows you to upload a file. It requires a valid JWT token in the Authorization header.
 *     requestBody:
 *       required: true
 *       content:
 *         multipart/form-data:
 *           schema:
 *             type: object
 *             properties:
 *               file:
 *                 type: string
 *                 format: binary
 *                 description: The file to upload
 *               expiryDate:
 *                 type: string
 *                 format: date-time
 *                 description: The expiry date of the file
 *               password:
 *                 type: string
 *                 description: The password to protect the file
 *     parameters:
 *       - in: header
 *         name: Authorization
 *         required: true
 *         schema:
 *           type: string
 *         description: The JWT token of your account to have access
 *     responses:
 *       200:
 *         description: Success
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 message:
 *                   type: string
 *       400:
 *         description: Bad Request
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 message:
 *                   type: string
 *       401:
 *         description: Unauthorized
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 message:
 *                   type: string
 *       500:
 *         description: Error uploading the file
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 message:
 *                   type: string
 *                 error:
 *                   type: string
 */

function authenticateToken(req, res, next) {
  let token = null;
  const authHeader = req.headers['authorization'];

  if (authHeader) {
    token = authHeader.split(' ')[1];
  } else if (req.query.token) {
    token = req.query.token;
  }

  if (token == null) {
    if (req.user) {
      return next();
    } else {
      return res.status(401).json({ message: 'Unauthorized' });
    }
  }

  fs.readFile(path.join(__dirname, '../../../data', 'user.json'), 'utf8', (err, data) => {
    if (err) {
      console.error('Error reading user.json:', err);
      return res.status(401).json({ message: 'Unauthorized' });
    }

    const users = JSON.parse(data);

    const user = users.find(u => u.token === token);

    if (user) {
      req.user = user;
      next();
    } else {
      return res.status(401).json({ message: 'Unauthorized' });
    }
  });
}

router.get('/', (req, res) => {
    res.status(400).json({ error: 'Bad Request. The request cannot be fulfilled due to bad syntax or missing parameters.' });
});

router.use(fileUpload({
    limits: { fileSize: 15 * 1024 * 1024 * 1024 },
}));

router.post('/', authenticateToken, async (req, res) => {
    try {
        if (!req.files || Object.keys(req.files).length === 0) {
            return res.status(400).send('5410 - Download error, please try again later.');
        }

        const file = req.files.file;
        const userId = req.user.name;
        const Id = req.user.id;
        const uploadDir = path.join('cdn-files', userId);
        const originalFileName = file.name;
        const domain = config.domain || 'mydomain.com';
        let expiryDate = req.body.expiryDate;
        let password = req.body.password;

        if (!fs.existsSync(uploadDir)) {
            fs.mkdirSync(uploadDir, { recursive: true });
        }

        file.mv(path.join(uploadDir, originalFileName), async (err) => {
            if (err) {
                console.error(err);
                return res.status(500).send({ message: 'Error downloading file.' });
            }

            const fileExtension = path.extname(originalFileName).toLowerCase();

            const bcrypt = require('bcrypt');
            const saltRounds = 10;

            let hashedPassword = '';
            if (password) {
                hashedPassword = bcrypt.hashSync(password, saltRounds);
            }

            const fileInfo = {
                fileName: originalFileName,
                expiryDate: expiryDate || '',
                password: hashedPassword,
                Id: Id,
                path: path.join(uploadDir, originalFileName) 
            };

            if (expiryDate || password) {
                let data = [];
                if (fs.existsSync(path.join(__dirname, '../../../data', 'file_info.json'))) {
                    const existingData = await fs.promises.readFile(path.join(__dirname, '../../../data', 'file_info.json'), 'utf8');
                    data = JSON.parse(existingData);
                    if (!Array.isArray(data)) {
                        data = [];
                    }
                }
                data.push(fileInfo);
                await fs.promises.writeFile(path.join(__dirname, '../../../data', 'file_info.json'), JSON.stringify(data, null, 2));
            }

            res.status(200).send({ message: 'Your file has been successfully uploaded.' });
        });       
    } catch (error) {
        console.error(error);
        return res.status(500).send({ message: 'Error downloading file.' });
    }
});

module.exports = router;