const PDFDocument = require('pdfkit');
const fs = require('fs');
const { spawn } = require('child_process');
const path = require('path');

module.exports = {
	generateFile(username, studentId, req, res) {
		// Create the output text
		const infoArray = [
			'Username:',
			`${username}`,
			'',
			'Email:',
			`${username}@kvcc.me.edu`,
			'',
			'Student ID:',
			`${studentId}`,
			'',
			'Note: When signing into the MyKV Portal, use your Username not your Email.',
			'',
			'For further assistance contact ithelp@mainecc.edu'
		];
		const infoString = infoArray.join('\n');
		
		// Define the path for the PDF file
		const pdfFilePath = path.join(__dirname, 'output.pdf');
		
		// Create a new PDF document
		const doc = new PDFDocument({
			size: [204, 1000],
			margin: 5
		});
		
		// Create a writable stream to save the PDF to a file
		const writeStream = fs.createWriteStream(pdfFilePath);
		doc.pipe(writeStream);
		
		// Add content (image, text) to the PDF
		doc.image('./public/itslogo.jpg', {
			fit: [196, 100],
			align: 'center',
			valign: 'top',
		});
		
		doc.moveDown();
		doc.moveDown();
		doc.moveDown();
		doc.moveDown();
		doc.moveDown();
		doc.moveDown();
		doc.moveDown();
		doc.fontSize(12).text(infoString, {
			align: 'left',
		});
		
		// Finalize the PDF
		doc.end();
		
		writeStream.on('finish', () => {
			// PDF file has been saved, now print it using lp command
			const printer = spawn('lp', ['-d', 'ITThermal', pdfFilePath]); // Replace 'ITThermal' with your actual printer name
			
			// Handle error if the printing process fails
			printer.on('error', (err) => {
				console.error('Failed to start printing process:', err);
				res.status(500).json({ message: 'Failed to start printing process', error: err.message });
			});
			
			// Handle the process exit event
			printer.on('close', (code) => {
				if (code === 0) {
					// Delete the file after printing to clean up
					fs.unlink(pdfFilePath, (err) => {
						if (err) {
							console.error('Error deleting file:', err);
							res.status(500).json({ message: 'Failed to clean up after printing', error: err.message });
							return;
						}
						res.send('PDF sent to printer successfully.');
					});
				} else {
					res.status(500).json({ message: 'Failed to print PDF' });
				}
			});
		});
		
		// Handle any errors during file writing
		writeStream.on('error', (err) => {
			console.error('Error writing PDF file:', err);
			res.status(500).json({ message: 'Error writing PDF file', error: err.message });
		});
	}
}