import express from 'express';
import multer from 'multer';
import { saveLead, getLeads } from '../db.js';
import { sendContactEmail, sendCareersEmail, sendStrategyEmail } from '../services/mailService.js';

const router = express.Router();
const upload = multer({ storage: multer.memoryStorage(), limits: { fileSize: 10 * 1024 * 1024 } });

async function verifyTurnstile(token, remoteip) {
  const secretKey = process.env.TURNSTILE_SECRET_KEY || '1x000000000000000000000000000000AA';
  if (!token) return { success: false, 'error-codes': ['missing-input-response'] };

  try {
    const formData = new URLSearchParams();
    formData.append('secret', secretKey);
    formData.append('response', token);
    if (remoteip) formData.append('remoteip', remoteip);

    const res = await fetch('https://challenges.cloudflare.com/turnstile/v0/siteverify', {
      method: 'POST',
      body: formData
    });
    return await res.json();
  } catch (err) {
    console.error('Turnstile verification exception:', err);
    return { success: true };
  }
}

// POST /api/contact - Handle Contact, Careers, and Strategy Call form submissions via SMTP
router.post('/', upload.single('resume'), async (req, res) => {
  try {
    const { name, email, phone, mobile, subject, message, interests, type, designation, dateTime, resumeName, turnstileToken } = req.body;

    const contactName = name?.trim();
    const contactEmail = email?.trim();
    const contactPhone = (phone || mobile || '').trim();
    const contactSubject = (subject || interests || type || 'General Inquiry').trim();
    const contactMessage = (message || req.body.comments || '').trim();

    if (!contactName || !contactEmail) {
      return res.status(400).json({ error: 'Name and Email are required.' });
    }

    // Verify Cloudflare Turnstile Token
    if (turnstileToken) {
      const turnstileRes = await verifyTurnstile(turnstileToken, req.ip);
      if (!turnstileRes.success) {
        return res.status(400).json({ error: 'Cloudflare Turnstile security verification failed. Please try again.' });
      }
    }

    // Save lead record in database
    const lead = saveLead({
      name: contactName,
      email: contactEmail,
      phone: contactPhone,
      subject: contactSubject,
      message: contactMessage,
      designation,
      dateTime,
      resumeName,
      type: type || 'contact'
    });

    // Attempt sending email via SMTP service based on form type
    let mailResult = { success: false };

    if (type === 'careers') {
      mailResult = await sendCareersEmail({
        name: contactName,
        email: contactEmail,
        phone: contactPhone,
        resumeName: req.file ? req.file.originalname : (resumeName || 'Resume Uploaded'),
        message: contactMessage,
        file: req.file
      });
    } else if (type === 'strategy') {
      mailResult = await sendStrategyEmail({
        name: contactName,
        email: contactEmail,
        phone: contactPhone,
        designation: designation || 'N/A',
        dateTime: dateTime || 'N/A',
        interests: interests || 'General Strategy Consultation',
        message: contactMessage
      });
    } else {
      mailResult = await sendContactEmail({
        name: contactName,
        email: contactEmail,
        phone: contactPhone,
        subject: contactSubject,
        message: contactMessage
      });
    }

    if (!mailResult.success) {
      // If SMTP is not yet configured or fails, return 200 with lead saved & warning
      return res.status(200).json({
        success: true,
        saved: true,
        leadId: lead.id,
        smtpError: mailResult.error,
        message: 'Your request was saved successfully. Note: SMTP email dispatch requires SMTP credentials in .env.'
      });
    }

    return res.status(200).json({
      success: true,
      saved: true,
      leadId: lead.id,
      messageId: mailResult.messageId,
      message: 'Request sent successfully via SMTP!'
    });
  } catch (error) {
    console.error('[Contact Route Error]', error);
    return res.status(500).json({ error: error.message || 'Internal Server Error' });
  }
});

// GET /api/contact/leads - Retrieve saved contact leads
router.get('/leads', (_req, res) => {
  try {
    const leads = getLeads();
    return res.json({ success: true, leads });
  } catch (error) {
    return res.status(500).json({ error: error.message });
  }
});

export default router;