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

const info = {
	deptName: "IT Support",
	supportEmail: "ITHelp@MaineCC.edu",
	supportPhone: "(207) 453-5079"
}

const receiptFooter = `For other technical assistance, contact ${info.deptName}:\n${info.supportEmail}\nor ${info.supportPhone}.`;

const mccContractor = {
	name: "Contracting Company",
	email: "helpme@contractor.com",
	phone: "1 (800) 234-5678",
	site: "www.google.com"
};

module.exports = {
	generateInfo: {
		credentials(username, studentId) {
			// Create the output text
			const infoArray = [
				`Username: ${username}`,
				'',
				'Email:',
				`${username}@kvcc.me.edu`,
				'',
				`Student ID: ${studentId}`,
				'',
				'Note: the MyKV Portal uses your username to sign in, not email.',
				receiptFooter
			];
			return infoArray.join('\n');
		},
		maineCC() {
			// Create the output text
			const infoArray = [
				'Kennebec Valley Community College is migrating email domains from @kvcc.me.edu to @mainecc.edu.\n',
				`For support with this transition, please contact:\n${mccContractor.name}`,
				`${mccContractor.phone}`,
				`${mccContractor.email}`,
				`${mccContractor.site}\n`,
				receiptFooter
			];
			return infoArray.join('\n');
		},
		tempPassword(password) {
			// Create the output text
			const infoArray = [
				'We have changed your password to a temporary password, shown below. Next time you log into Microsoft you will be prompted to change your password.\n',
				'Temporary Password:',
				`${password}\n`,
				'Password requirements:\n8+ characters\n1+ Uppercase\n1+ Lowercase\n1+ Special (!/_=.,?)\n',
				receiptFooter
			];
			return infoArray.join('\n');
		}
	},
	generatePdf(infoString) {
		return new Promise((resolve, reject) => {
			// Define the path for the PDF file
			const pdfFilePath = path.join(__dirname, '../public/output.pdf');
			
			// Create a new PDF document
			const doc = new PDFDocument({
				size: [204, 400],
				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',
			});
			
			// Move down below the Logo/Banner image
			doc.moveDown();
			doc.moveDown();
			doc.moveDown();
			doc.moveDown();
			doc.moveDown();
			doc.moveDown();
			doc.moveDown();

			// Write the text from infoString
			doc.fontSize(12)
			doc.font('public/Outfit-Regular.ttf').text(infoString, {
				align: 'left',
			});
			
			// Finalize the PDF
			doc.end();
			
			writeStream.on('finish', () => {
				resolve();
			});
			
			// Handle any errors during file writing
			writeStream.on('error', (err) => {
				reject(err);
			});
		})
	},
	print() {
		return new Promise((resolve, reject) => {
			// Define the path for the PDF file
			const pdfFilePath = path.join(__dirname, '../public/output.pdf');
			// Start the print command
			const printer = spawn('lp', ['-d', 'ITThermal', pdfFilePath]);
			
			// Handle error if the printing process fails
			printer.on('error', (err) => {
				reject(err);
			});
			
			// Handle the process exit event
			printer.on('close', (code) => {
				if (code === 0) {
					resolve()
				} else {
					reject("lp process exited with non-zero result.");
				}
			});
		})
	}
}