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const User = require('../Models/User');
const Event = require('../Models/Event');
const EventParticipationLog = require('../Models/EventParticipationLog');
const Institution = require('../Models/Institution');
const axios = require('axios');
const QRCode = require('qrcode');
const nodemailer = require('nodemailer'); // Added for email notifications
const { notifyUser } = require('../Services/notification');
// ML Certificate Generation API Configuration
const ML_API_CONFIG = {
baseURL: process.env.ML_CERTIFICATE_API_URL || 'https://ml-certificate-api.example.com',
timeout: 30000, // 30 seconds
headers: {
'Content-Type': 'application/json',
'Authorization': `Bearer ${process.env.ML_API_KEY || ''}`
}
};
/**
* Generate certificate data for ML API
*/
async function prepareCertificateData(userId, eventId, certificateType) {
try {
// Fetch user, event, and participation data
const [user, event, participationLog] = await Promise.all([
User.findById(userId).populate('institutionId'),
Event.findById(eventId).populate('hostUserId'),
EventParticipationLog.findOne({ userId, eventId, status: 'attended' })
]);
if (!user || !event || !participationLog) {
throw new Error('User, event, or attendance data not found');
}
// Generate QR code for certificate verification
const qrData = JSON.stringify({
certificateId: `cert_${userId}_${eventId}_${Date.now()}`,
userId: userId.toString(),
eventId: eventId.toString(),
issuedAt: new Date().toISOString()
});
const qrCode = await QRCode.toDataURL(qrData);
// Prepare certificate data for ML API
const certificateData = {
userName: user.name,
userEmail: user.email,
eventTitle: event.title,
eventDescription: event.description,
eventDate: event.schedule.start,
eventLocation: event.location || 'Online',
organizerName: event.hostUserId ? event.hostUserId.name : event.organizer,
institutionName: user.institutionId ? user.institutionId.name : 'Unknown Institution',
certificateType,
userSkills: user.skills || [],
eventTags: event.tags || [],
attendanceDate: participationLog.attendanceTimestamp,
qrCode,
// Additional metadata for ML processing
eventDuration: event.schedule.end - event.schedule.start,
userInterests: user.interests || [],
eventType: event.type,
isPaid: event.isPaid,
price: event.price
};
return certificateData;
} catch (error) {
console.error('Error preparing certificate data:', error);
throw error;
}
}
/**
* Send certificate data to ML API for generation
*/
async function sendToMLAPI(certificateData) {
try {
const response = await axios.post(
`${ML_API_CONFIG.baseURL}/generate-certificate`,
certificateData,
{
timeout: ML_API_CONFIG.timeout,
headers: ML_API_CONFIG.headers
}
);
return {
success: true,
requestId: response.data.requestId,
certificateURL: response.data.certificateURL,
generationStatus: 'generated'
};
} catch (error) {
console.error('ML API Error:', error.response?.data || error.message);
return {
success: false,
requestId: null,
errorMessage: error.response?.data?.message || error.message,
generationStatus: 'failed'
};
}
}
/**
* Generate certificate for attended user
*/
async function generateCertificate(req, res) {
try {
const { userId, eventId, certificateType = 'participant' } = req.body;
const requesterId = req.user.id;
// Validate inputs
if (!userId || !eventId) {
return res.status(400).json({ error: 'User ID and Event ID are required' });
}
// Check if user has permission (host, co-host, or platform admin)
const event = await Event.findById(eventId);
if (!event) {
return res.status(404).json({ error: 'Event not found' });
}
const isHost = event.hostUserId.toString() === requesterId;
const isCoHost = event.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can generate certificates' });
}
// Check if user attended the event
const participationLog = await EventParticipationLog.findOne({
userId,
eventId,
status: 'attended'
});
if (!participationLog) {
return res.status(400).json({ error: 'User must have attended the event to receive a certificate' });
}
// Check if certificate already exists
const existingCertificate = await Certificate.findOne({ userId, eventId });
if (existingCertificate) {
return res.status(400).json({ error: 'Certificate already exists for this user and event' });
}
// Prepare certificate data
const certificateData = await prepareCertificateData(userId, eventId, certificateType);
// Create certificate record
const certificate = new Certificate({
userId,
eventId,
type: certificateType,
status: 'pending',
certificateData
});
// Send to ML API
const mlResponse = await sendToMLAPI(certificateData);
// Update certificate with ML API response
certificate.mlApiResponse = {
requestId: mlResponse.requestId,
generationStatus: mlResponse.generationStatus,
errorMessage: mlResponse.errorMessage,
generatedAt: new Date()
};
if (mlResponse.success) {
certificate.status = 'generated';
certificate.certificateURL = mlResponse.certificateURL;
// Notify user of certificate generation
const user = await User.findById(userId);
if (user) {
await notifyUser({
userId,
type: 'certificate',
message: `Your certificate for ${event.title} is ready!`,
data: { eventId, certificateId: certificate._id, certificateURL: certificate.certificateURL },
emailOptions: {
to: user.email,
subject: `Your Certificate for ${event.title} is Ready!`,
html: `<h2>🎉 Your Certificate is Ready!</h2><p>Dear ${user.name},</p><p>Your certificate for <strong>${event.title}</strong> has been generated and is now available.</p><p><strong>Certificate Type:</strong> ${certificate.type}</p><p>You can view and download your certificate from your CampVerse dashboard.</p><br><p>Best regards,<br>CampVerse Team</p>`
}
});
}
} else {
certificate.status = 'failed';
}
await certificate.save();
return res.status(201).json({
message: 'Certificate generation initiated',
certificate: {
id: certificate._id,
status: certificate.status,
type: certificate.type,
certificateURL: certificate.certificateURL,
issuedAt: certificate.issuedAt
}
});
} catch (error) {
console.error('Certificate generation error:', error);
return res.status(500).json({ error: 'Error generating certificate' });
}
}
/**
* Generate certificates for all attended users (batch processing)
*/
async function generateBatchCertificates(req, res) {
try {
const { eventId, certificateType = 'participant' } = req.body;
const requesterId = req.user.id;
// Validate inputs
if (!eventId) {
return res.status(400).json({ error: 'Event ID is required' });
}
// Check permissions
const event = await Event.findById(eventId);
if (!event) {
return res.status(404).json({ error: 'Event not found' });
}
const isHost = event.hostUserId.toString() === requesterId;
const isCoHost = event.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can generate batch certificates' });
}
// Get all attended users for the event
const attendedUsers = await EventParticipationLog.find({
eventId,
status: 'attended'
}).populate('userId', 'name email');
if (attendedUsers.length === 0) {
return res.status(400).json({ error: 'No attended users found for this event' });
}
const results = {
total: attendedUsers.length,
generated: 0,
skipped: 0,
failed: 0,
certificates: []
};
// Process each attended user
for (const attendance of attendedUsers) {
try {
// Check if certificate already exists
const existingCertificate = await Certificate.findOne({
userId: attendance.userId._id,
eventId
});
if (existingCertificate) {
results.skipped++;
results.certificates.push({
userId: attendance.userId._id,
userName: attendance.userId.name,
userEmail: attendance.userId.email,
status: 'skipped',
reason: 'Certificate already exists'
});
continue;
}
// Prepare certificate data
const certificateData = await prepareCertificateData(
attendance.userId._id,
eventId,
certificateType
);
// Create certificate record
const certificate = new Certificate({
userId: attendance.userId._id,
eventId,
type: certificateType,
status: 'pending',
certificateData
});
// Send to ML API
const mlResponse = await sendToMLAPI(certificateData);
// Update certificate with ML API response
certificate.mlApiResponse = {
requestId: mlResponse.requestId,
generationStatus: mlResponse.generationStatus,
errorMessage: mlResponse.errorMessage,
generatedAt: new Date()
};
if (mlResponse.success) {
certificate.status = 'generated';
certificate.certificateURL = mlResponse.certificateURL;
results.generated++;
} else {
certificate.status = 'failed';
results.failed++;
}
await certificate.save();
results.certificates.push({
userId: attendance.userId._id,
userName: attendance.userId.name,
userEmail: attendance.userId.email,
status: certificate.status,
certificateId: certificate._id,
certificateURL: certificate.certificateURL
});
} catch (error) {
console.error(`Error generating certificate for user ${attendance.userId._id}:`, error);
results.failed++;
results.certificates.push({
userId: attendance.userId._id,
userName: attendance.userId.name,
userEmail: attendance.userId.email,
status: 'failed',
reason: error.message
});
}
}
return res.status(200).json({
message: 'Batch certificate generation completed',
eventId,
eventTitle: event.title,
results
});
} catch (error) {
console.error('Batch certificate generation error:', error);
return res.status(500).json({ error: 'Error generating batch certificates' });
}
}
/**
* Get user's certificates
*/
async function getUserCertificates(req, res) {
try {
const userId = req.params.userId || req.user.id;
const certificates = await Certificate.find({ userId })
.populate('eventId', 'title description schedule')
.sort({ issuedAt: -1 });
return res.json({ certificates });
} catch (error) {
console.error('Error fetching user certificates:', error);
return res.status(500).json({ error: 'Error fetching certificates' });
}
}
/**
* Get certificate by ID
*/
async function getCertificateById(req, res) {
try {
const certificateId = req.params.id;
const certificate = await Certificate.findById(certificateId)
.populate('userId', 'name email')
.populate('eventId', 'title description schedule organizer');
if (!certificate) {
return res.status(404).json({ error: 'Certificate not found' });
}
return res.json({ certificate });
} catch (error) {
console.error('Error fetching certificate:', error);
return res.status(500).json({ error: 'Error fetching certificate' });
}
}
/**
* Verify certificate using QR code
*/
async function verifyCertificate(req, res) {
try {
const { qrCode } = req.body;
if (!qrCode) {
return res.status(400).json({ error: 'QR code is required' });
}
// Decode QR code data
let qrData;
try {
qrData = JSON.parse(qrCode);
} catch (error) {
return res.status(400).json({ error: 'Invalid QR code format' });
}
// Find certificate
const certificate = await Certificate.findOne({
userId: qrData.userId,
eventId: qrData.eventId
}).populate('userId', 'name email')
.populate('eventId', 'title description schedule');
if (!certificate) {
return res.status(404).json({ error: 'Certificate not found' });
}
if (certificate.status !== 'generated') {
return res.status(400).json({ error: 'Certificate not yet generated' });
}
return res.json({
valid: true,
certificate: {
userName: certificate.userId.name,
userEmail: certificate.userId.email,
eventTitle: certificate.eventId.title,
eventDate: certificate.eventId.schedule.start,
certificateType: certificate.type,
issuedAt: certificate.issuedAt,
certificateURL: certificate.certificateURL
}
});
} catch (error) {
console.error('Certificate verification error:', error);
return res.status(500).json({ error: 'Error verifying certificate' });
}
}
/**
* Export attended users for ML certificate generation (batch processing)
*/
async function exportAttendedUsers(req, res) {
try {
const { eventId } = req.params;
const requesterId = req.user.id;
// Check permissions
const event = await Event.findById(eventId);
if (!event) {
return res.status(404).json({ error: 'Event not found' });
}
const isHost = event.hostUserId.toString() === requesterId;
const isCoHost = event.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can export attended users' });
}
// Get all attended users for the event
const attendedUsers = await EventParticipationLog.find({
eventId,
status: 'attended'
}).populate('userId', 'name email skills interests')
.populate('eventId', 'title description schedule tags type');
// Prepare data for ML API
const exportData = {
eventId,
eventTitle: event.title,
eventDescription: event.description,
eventDate: event.schedule.start,
eventLocation: event.location || 'Online',
organizerName: event.organizer,
totalAttended: attendedUsers.length,
attendedUsers: attendedUsers.map(log => ({
userId: log.userId._id,
userName: log.userId.name,
userEmail: log.userId.email,
userSkills: log.userId.skills || [],
userInterests: log.userId.interests || [],
attendanceDate: log.attendanceTimestamp,
certificateType: 'participant' // Default type
}))
};
return res.json({
message: 'Attended users exported successfully',
data: exportData,
count: attendedUsers.length
});
} catch (error) {
console.error('Export attended users error:', error);
return res.status(500).json({ error: 'Error exporting attended users' });
}
}
/**
* Retry failed certificate generation
*/
async function retryCertificateGeneration(req, res) {
try {
const { certificateId } = req.params;
const requesterId = req.user.id;
const certificate = await Certificate.findById(certificateId)
.populate('eventId');
if (!certificate) {
return res.status(404).json({ error: 'Certificate not found' });
}
// Check permissions
const isHost = certificate.eventId.hostUserId.toString() === requesterId;
const isCoHost = certificate.eventId.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can retry certificate generation' });
}
if (certificate.status !== 'failed') {
return res.status(400).json({ error: 'Certificate is not in failed status' });
}
// Retry ML API call
const mlResponse = await sendToMLAPI(certificate.certificateData);
// Update certificate
certificate.mlApiResponse = {
requestId: mlResponse.requestId,
generationStatus: mlResponse.generationStatus,
errorMessage: mlResponse.errorMessage,
generatedAt: new Date()
};
if (mlResponse.success) {
certificate.status = 'generated';
certificate.certificateURL = mlResponse.certificateURL;
}
await certificate.save();
return res.json({
message: 'Certificate generation retry completed',
status: certificate.status,
certificateURL: certificate.certificateURL
});
} catch (error) {
console.error('Retry certificate generation error:', error);
return res.status(500).json({ error: 'Error retrying certificate generation' });
}
}
/**
* Get certificate statistics
*/
async function getCertificateStats(req, res) {
try {
const userId = req.user.id;
const stats = await Certificate.aggregate([
{ $match: { userId: new require('mongoose').Types.ObjectId(userId) } },
{
$group: {
_id: '$status',
count: { $sum: 1 }
}
}
]);
const totalCertificates = await Certificate.countDocuments({ userId });
const generatedCertificates = await Certificate.countDocuments({
userId,
status: 'generated'
});
return res.json({
totalCertificates,
generatedCertificates,
pendingCertificates: totalCertificates - generatedCertificates,
stats
});
} catch (error) {
console.error('Certificate stats error:', error);
return res.status(500).json({ error: 'Error fetching certificate statistics' });
}
}
/**
* Get certificate generation progress for an event
*/
async function getCertificateProgress(req, res) {
try {
const { eventId } = req.params;
const requesterId = req.user.id;
// Check permissions
const event = await Event.findById(eventId);
if (!event) {
return res.status(404).json({ error: 'Event not found' });
}
const isHost = event.hostUserId.toString() === requesterId;
const isCoHost = event.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can view certificate progress' });
}
// Get total attended users
const totalAttended = await EventParticipationLog.countDocuments({
eventId,
status: 'attended'
});
// Get certificate statistics
const certificates = await Certificate.find({ eventId });
const generated = certificates.filter(c => c.status === 'generated').length;
const pending = certificates.filter(c => c.status === 'pending').length;
const failed = certificates.filter(c => c.status === 'failed').length;
const notGenerated = totalAttended - certificates.length;
const progress = {
eventId,
eventTitle: event.title,
totalAttended,
certificatesGenerated: generated,
certificatesPending: pending,
certificatesFailed: failed,
certificatesNotGenerated: notGenerated,
generationProgress: totalAttended > 0 ? Math.round((certificates.length / totalAttended) * 100) : 0,
successRate: certificates.length > 0 ? Math.round((generated / certificates.length) * 100) : 0
};
return res.json(progress);
} catch (error) {
console.error('Certificate progress error:', error);
return res.status(500).json({ error: 'Error fetching certificate progress' });
}
}
/**
* Send certificate notification to user
*/
async function sendCertificateNotification(req, res) {
try {
const { certificateId } = req.params;
const requesterId = req.user.id;
const certificate = await Certificate.findById(certificateId)
.populate('userId', 'name email')
.populate('eventId', 'title');
if (!certificate) {
return res.status(404).json({ error: 'Certificate not found' });
}
// Check permissions
const isHost = certificate.eventId.hostUserId.toString() === requesterId;
const isCoHost = certificate.eventId.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can send certificate notifications' });
}
if (certificate.status !== 'generated') {
return res.status(400).json({ error: 'Certificate must be generated before sending notification' });
}
await notifyUser({
userId: certificate.userId._id,
type: 'certificate',
message: `Your certificate for ${certificate.eventId.title} is ready!`,
data: { eventId: certificate.eventId._id, certificateId: certificate._id, certificateURL: certificate.certificateURL },
emailOptions: {
to: certificate.userId.email,
subject: `Your Certificate for ${certificate.eventId.title} is Ready!`,
html: `<h2>🎉 Your Certificate is Ready!</h2><p>Dear ${certificate.userId.name},</p><p>Your certificate for <strong>${certificate.eventId.title}</strong> has been generated and is now available.</p><p><strong>Certificate Type:</strong> ${certificate.type}</p><p>You can view and download your certificate from your CampVerse dashboard.</p><br><p>Best regards,<br>CampVerse Team</p>`
}
});
return res.json({
message: 'Certificate notification sent successfully',
recipient: certificate.userId.email
});
} catch (error) {
console.error('Send certificate notification error:', error);
return res.status(500).json({ error: 'Error sending certificate notification' });
}
}
/**
* Get certificate management dashboard for hosts
*/
async function getCertificateDashboard(req, res) {
try {
const requesterId = req.user.id;
const { eventId, status, certificateType, page = 1, limit = 10 } = req.query;
// Build query for events hosted by the user
const eventQuery = { hostUserId: requesterId };
if (eventId) {
eventQuery._id = eventId;
}
const events = await Event.find(eventQuery, '_id title schedule');
const eventIds = events.map(event => event._id);
if (eventIds.length === 0) {
return res.json({
certificates: [],
pagination: {
page: parseInt(page),
limit: parseInt(limit),
total: 0,
pages: 0
},
summary: {
totalCertificates: 0,
generated: 0,
pending: 0,
failed: 0
}
});
}
// Build certificate query
const certificateQuery = { eventId: { $in: eventIds } };
if (status) {
certificateQuery.status = status;
}
if (certificateType) {
certificateQuery.type = certificateType;
}
// Calculate pagination
const skip = (parseInt(page) - 1) * parseInt(limit);
const totalCertificates = await Certificate.countDocuments(certificateQuery);
// Get certificates with pagination
const certificates = await Certificate.find(certificateQuery)
.populate('userId', 'name email')
.populate('eventId', 'title schedule')
.sort({ createdAt: -1 })
.skip(skip)
.limit(parseInt(limit));
// Get summary statistics
const summary = await Certificate.aggregate([
{ $match: { eventId: { $in: eventIds } } },
{
$group: {
_id: '$status',
count: { $sum: 1 }
}
}
]);
const summaryObj = {
totalCertificates,
generated: 0,
pending: 0,
failed: 0
};
summary.forEach(item => {
summaryObj[item._id] = item.count;
});
return res.json({
certificates: certificates.map(cert => ({
id: cert._id,
userId: cert.userId._id,
userName: cert.userId.name,
userEmail: cert.userId.email,
eventId: cert.eventId._id,
eventTitle: cert.eventId.title,
eventDate: cert.eventId.schedule?.start,
certificateType: cert.type,
status: cert.status,
certificateURL: cert.certificateURL,
issuedAt: cert.issuedAt,
createdAt: cert.createdAt
})),
pagination: {
page: parseInt(page),
limit: parseInt(limit),
total: totalCertificates,
pages: Math.ceil(totalCertificates / parseInt(limit))
},
summary: summaryObj,
events: events.map(event => ({
id: event._id,
title: event.title,
date: event.schedule?.start
}))
});
} catch (error) {
console.error('Certificate dashboard error:', error);
return res.status(500).json({ error: 'Error fetching certificate dashboard' });
}
}
/**
* Bulk retry failed certificates for an event
*/
async function bulkRetryFailedCertificates(req, res) {
try {
const { eventId } = req.params;
const requesterId = req.user.id;
// Check permissions
const event = await Event.findById(eventId);
if (!event) {
return res.status(404).json({ error: 'Event not found' });
}
const isHost = event.hostUserId.toString() === requesterId;
const isCoHost = event.coHosts.includes(requesterId);
const isAdmin = req.user.roles.includes('platformAdmin');
if (!isHost && !isCoHost && !isAdmin) {
return res.status(403).json({ error: 'Only event hosts, co-hosts, or admins can retry failed certificates' });
}
// Get all failed certificates for the event
const failedCertificates = await Certificate.find({
eventId,
status: 'failed'
});
if (failedCertificates.length === 0) {
return res.status(400).json({ error: 'No failed certificates found for this event' });
}
const results = {
total: failedCertificates.length,
retried: 0,
success: 0,
failed: 0,
certificates: []
};
// Retry each failed certificate
for (const certificate of failedCertificates) {
try {
// Retry ML API call
const mlResponse = await sendToMLAPI(certificate.certificateData);
// Update certificate
certificate.mlApiResponse = {
requestId: mlResponse.requestId,
generationStatus: mlResponse.generationStatus,
errorMessage: mlResponse.errorMessage,
generatedAt: new Date()
};
if (mlResponse.success) {
certificate.status = 'generated';
certificate.certificateURL = mlResponse.certificateURL;
results.success++;
} else {
certificate.status = 'failed';
results.failed++;
}
await certificate.save();
results.retried++;
results.certificates.push({
certificateId: certificate._id,
status: certificate.status,
success: mlResponse.success,
errorMessage: mlResponse.errorMessage
});
} catch (error) {
console.error(`Error retrying certificate ${certificate._id}:`, error);
results.failed++;
results.certificates.push({
certificateId: certificate._id,
status: 'failed',
success: false,
errorMessage: error.message
});
}
}
return res.json({
message: 'Bulk retry completed',
eventId,
eventTitle: event.title,
results
});
} catch (error) {
console.error('Bulk retry error:', error);
return res.status(500).json({ error: 'Error retrying failed certificates' });
}
}
module.exports = {
generateCertificate,
getUserCertificates,
getCertificateById,
verifyCertificate,
exportAttendedUsers,
retryCertificateGeneration,
getCertificateStats,
generateBatchCertificates,
getCertificateProgress,
sendCertificateNotification,
getCertificateDashboard,
bulkRetryFailedCertificates
}; |