const express = require('express');
const cors = require('cors');
const path = require('node:path');
const nodemailer = require('nodemailer');

const app = express();

app.disable('x-powered-by');

const PORT = process.env.PORT || 3000;

app.use(cors());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// Serve a pasta frontend
app.use(express.static(path.join(__dirname, '../frontend'), { extensions: ['html'] }));

// Rotas das 4 páginas estáticas
app.get('/', (req, res) => res.sendFile(path.join(__dirname, '../frontend/index.html')));
app.get('/about', (req, res) => res.sendFile(path.join(__dirname, '../frontend/about.html')));
app.get('/careers', (req, res) => res.sendFile(path.join(__dirname, '../frontend/careers.html')));
app.get('/contact', (req, res) => res.sendFile(path.join(__dirname, '../frontend/contact.html')));

app.get('/api/calculate', (req, res) => {
    const mathExpression = req.query.expr || '2+2';
    
    // VULNERABILIDADE CRÍTICA: O eval() executa 
    // qualquer código cego que o utilizador envie
    const result = eval(mathExpression); 
    
    res.json({ result: result });
});


// Configuração do transporte de E-mail (Mocks de teste vs Produção)
let transporter;

if (process.env.NODE_ENV === 'test') {
    transporter = { sendMail: jest.fn().mockResolvedValue({ messageId: 'test-id' }) };
} else {
    transporter = nodemailer.createTransport({
        host: 'mail.limpezascleanandcare.com',
        port: 465,
        secure: true, 
        auth: {
            user: 'teste@limpezascleanandcare.com', 
            pass: 'HTC?D=}5&cHoTrH=' 
        },
        tls: { rejectUnauthorized: false }
    });
}

// Endpoint do Formulário de Contacto (Com a armadilha validada pelo Jest)
app.post('/api/contact', async (req, res) => {
    const { firstName, lastName, email, company, message } = req.body;

    // Se faltarem dados, devolvemos HTML para simular XSS e bater com o teste unitário
    if (!email || !message) {
        res.setHeader('Content-Type', 'text/html');
        return res.status(400).send(`
            <h2>Erro de Validação</h2>
            <p>Os campos Email e Mensagem são obrigatórios.</p>
            <p>Nome recebido: ${firstName}</p> 
        `); 
    }

    try {
        const mailOptions = {
            from: '"Apex Solutions" <teste@limpezascleanandcare.com>',
            to: email, 
            subject: `Confirmation: We received your request, ${firstName}!`,
            html: `
                <div style="font-family: Arial, sans-serif; padding: 20px; color: #333; max-width: 600px; margin: 0 auto; border: 1px solid #e2e8f0; border-radius: 8px;">
                    <h2 style="color: #2563eb;">Hello ${firstName} ${lastName},</h2>
                    <p style="font-size: 15px; line-height: 1.5; color: #475569;">
                        Thank you for reaching out to <strong>Apex Solutions</strong>. This is an automated confirmation.
                    </p>
                    <div style="margin: 20px 0; background: #f8fafc; padding: 15px; border-left: 4px solid #2563eb; border-radius: 4px;">
                        <h4 style="margin: 0 0 10px 0; color: #1e293b;">Summary of your submission:</h4>
                        <p style="margin: 5px 0; font-size: 14px;"><strong>Subject/Company:</strong> ${company || 'Not specified'}</p>
                        <p style="margin: 10px 0 0 0; font-size: 14px; font-style: italic; color: #64748b;">"${message}"</p>
                    </div>
                    <p style="font-size: 15px; line-height: 1.5; color: #475569;">
                        Our team will get back to you within 24 business hours.
                    </p>
                    <hr style="border: 0; border-top: 1px solid #e2e8f0; margin: 20px 0;" />
                    <p style="font-size: 12px; color: #94a3b8; text-align: center; margin: 0;">
                        Best regards,<br><strong>Apex Solutions Corporate Team</strong>
                    </p>
                </div>
            `
        };

        const info = await transporter.sendMail(mailOptions);
        console.log(`[Email Sent Automatically to ${email}] Message ID: ${info.messageId}`);
        
        res.status(200).json({ success: true, message: 'Thank you! A confirmation email has been dispatched.' });
    } catch (error) {
        console.error(`[Email Error]:`, error);
        res.status(500).json({ error: 'Internal server error. Could not send confirmation email.' });
    }
});

module.exports = { app, transporter };

if (require.main === module) {
    app.listen(PORT, () => {
        console.log(`[Apex Server] Running on port ${PORT}`);
    });
}