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

const app = express();

function loadConfig() {
	    try {
		            const configPath = path.join(__dirname, 'config.conf');
		            const content = fs.readFileSync(configPath, 'utf8');
		            const match = content.match(/^logs\s*=\s*(.*)$/m);
		            if (match && match[1].trim().toLowerCase() === 'disable') {
				                return { loggingEnabled: false };
				            }
		        } catch (e) {
				    }
	    return { loggingEnabled: true };
}

const config = loadConfig();

function logAction(message) {
	    if (config.loggingEnabled) {
		            console.log(`[ACTION] ${message}`);
		        }
}

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) {
		            logAction(`FAILED upload attempt: No files received.`);
		            return res.status(400).send('No files were uploaded.');
		        }
	    const uploadedNames = req.files.map(f => f.filename).join(', ');
	    logAction(`UPLOADED ${req.files.length} file(s): ${uploadedNames}`);
	    res.send(`Successfully uploaded ${req.files.length} file(s)!`);
});

app.get('/files', (req, res) => {
	    logAction(`LIST files requested.`);
	    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 filename = req.params.filename;
	    logAction(`PREVIEW/ACCESS file: ${filename}`);
	    const filePath = path.join(__dirname, 'uploads', filename);
	    res.sendFile(filePath, err => {
		            if (err) {
				                res.status(404).send(`File not found: ${filename}`);
				            }
		        });
});

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

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

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