const express = require('express');
const multer = require('multer');
const path = require('path');
const fs = require('fs');

const app = express();

const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, 'uploads/');
    },
    filename: (req, file, cb) => {
        const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
        cb(null, uniqueSuffix + '-' + file.originalname);
    }
});

const upload = multer({ storage: storage });

app.use(express.static(__dirname));

app.post('/upload', upload.array('files'), (req, res) => {
    if (!req.files || req.files.length === 0) {
        return res.status(400).send('No files were uploaded.');
    }
    res.send(`Successfully uploaded ${req.files.length} file(s)!`);
});

app.get('/files', (req, res) => {
    const directoryPath = path.join(__dirname, 'uploads');
    fs.readdir(directoryPath, (err, files) => {
        if (err) {
            return res.status(500).send('Unable to scan directory: ' + err);
        }
        const fileListPromises = files.map(file => {
            return new Promise((resolve) => {
                const filePath = path.join(directoryPath, file);
                fs.stat(filePath, (err, stats) => {
                    if (err) {
                        return resolve(null);
                    }
                    resolve({
                        name: file,
                        path: `/uploads/${file}`,
                        size: stats.size,
                        date: stats.mtime
                    });
                });
            });
        });

        Promise.all(fileListPromises).then(fileList => {
            res.json(fileList.filter(file => file !== null));
        });
    });
});

app.get('/uploads/:filename', (req, res) => {
    const filePath = path.join(__dirname, 'uploads', req.params.filename);
    res.sendFile(filePath, err => {
        if (err) {
            res.status(404).send('File not found');
        }
    });
});

app.get('/download/:filename', (req, res) => {
    const filePath = path.join(__dirname, 'uploads', req.params.filename);
    res.download(filePath, err => {
        if (err) {
            res.status(404).send('File not found');
        }
    });
});

app.delete('/delete/:filename', (req, res) => {
    const filePath = path.join(__dirname, 'uploads', req.params.filename);
    fs.unlink(filePath, err => {
        if (err) {
            return res.status(404).send('File not found');
        }
        res.send('File deleted successfully');
    });
});

app.listen(3000, () => {
    console.log('[*] Server is running on http://localhost:3000');
});