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const { body, validationResult } = require('express-validator');
const pool = require('../database/connection');
const { authenticateToken, requireRole } = require('../middleware/auth');
const router = express.Router();
// Get all applications (with filtering)
router.get('/', authenticateToken, async (req, res) => {
try {
const {
jobId,
candidateId,
status,
employerId,
page = 1,
limit = 10
} = req.query;
let query = `
SELECT a.*,
j.title as job_title,
j.employer_id,
e.company_name,
c.user_id as candidate_user_id,
u.first_name,
u.last_name,
u.email as candidate_email
FROM applications a
JOIN jobs j ON a.job_id = j.id
JOIN employers e ON j.employer_id = e.id
JOIN candidates c ON a.candidate_id = c.id
JOIN users u ON c.user_id = u.id
`;
const queryParams = [];
let paramCount = 0;
const conditions = [];
Iif (jobId) {
paramCount++;
conditions.push(`a.job_id = $${paramCount}`);
queryParams.push(jobId);
}
Iif (candidateId) {
paramCount++;
conditions.push(`a.candidate_id = $${paramCount}`);
queryParams.push(candidateId);
}
Iif (status) {
paramCount++;
conditions.push(`a.status = $${paramCount}`);
queryParams.push(status);
}
Iif (employerId) {
paramCount++;
conditions.push(`j.employer_id = $${paramCount}`);
queryParams.push(employerId);
}
// Role-based filtering
if (req.user.role === 'candidate') {
// Candidates can only see their own applications
const candidateResult = await pool.query(
'SELECT id FROM candidates WHERE user_id = $1',
[req.user.id]
);
Eif (candidateResult.rows.length > 0) {
paramCount++;
conditions.push(`a.candidate_id = $${paramCount}`);
queryParams.push(candidateResult.rows[0].id);
}
} else Eif (req.user.role === 'employer') {
// Employers can only see applications for their jobs
const employerResult = await pool.query(
'SELECT id FROM employers WHERE user_id = $1',
[req.user.id]
);
if (employerResult.rows.length > 0) {
paramCount++;
conditions.push(`j.employer_id = $${paramCount}`);
queryParams.push(employerResult.rows[0].id);
}
}
Eif (conditions.length > 0) {
query += ` WHERE ${conditions.join(' AND ')}`;
}
query += ` ORDER BY a.applied_at DESC`;
// Add pagination
const offset = (page - 1) * limit;
paramCount++;
query += ` LIMIT $${paramCount}`;
queryParams.push(limit);
paramCount++;
query += ` OFFSET $${paramCount}`;
queryParams.push(offset);
const result = await pool.query(query, queryParams);
// Get total count for pagination
let countQuery = `
SELECT COUNT(*)
FROM applications a
JOIN jobs j ON a.job_id = j.id
JOIN employers e ON j.employer_id = e.id
JOIN candidates c ON a.candidate_id = c.id
`;
const countParams = [];
let countParamCount = 0;
const countConditions = [];
Iif (jobId) {
countParamCount++;
countConditions.push(`a.job_id = $${countParamCount}`);
countParams.push(jobId);
}
Iif (candidateId) {
countParamCount++;
countConditions.push(`a.candidate_id = $${countParamCount}`);
countParams.push(candidateId);
}
Iif (status) {
countParamCount++;
countConditions.push(`a.status = $${countParamCount}`);
countParams.push(status);
}
Iif (employerId) {
countParamCount++;
countConditions.push(`j.employer_id = $${countParamCount}`);
countParams.push(employerId);
}
// Role-based filtering for count
if (req.user.role === 'candidate') {
const candidateResult = await pool.query(
'SELECT id FROM candidates WHERE user_id = $1',
[req.user.id]
);
Eif (candidateResult.rows.length > 0) {
countParamCount++;
countConditions.push(`a.candidate_id = $${countParamCount}`);
countParams.push(candidateResult.rows[0].id);
}
} else Eif (req.user.role === 'employer') {
const employerResult = await pool.query(
'SELECT id FROM employers WHERE user_id = $1',
[req.user.id]
);
if (employerResult.rows.length > 0) {
countParamCount++;
countConditions.push(`j.employer_id = $${countParamCount}`);
countParams.push(employerResult.rows[0].id);
}
}
Eif (countConditions.length > 0) {
countQuery += ` WHERE ${countConditions.join(' AND ')}`;
}
const countResult = await pool.query(countQuery, countParams);
res.json({
applications: result.rows,
pagination: {
page: parseInt(page),
limit: parseInt(limit),
total: parseInt(countResult.rows[0].count),
pages: Math.ceil(countResult.rows[0].count / limit)
}
});
} catch (error) {
console.error('Get applications error:', error);
res.status(500).json({ error: 'Failed to fetch applications' });
}
});
// Get application by ID
router.get('/:id', authenticateToken, async (req, res) => {
try {
const { id } = req.params;
const result = await pool.query(`
SELECT a.*,
j.title as job_title,
j.description as job_description,
j.employer_id,
e.company_name,
c.user_id as candidate_user_id,
u.first_name,
u.last_name,
u.email as candidate_email
FROM applications a
JOIN jobs j ON a.job_id = j.id
JOIN employers e ON j.employer_id = e.id
JOIN candidates c ON a.candidate_id = c.id
JOIN users u ON c.user_id = u.id
WHERE a.id = $1
`, [id]);
Iif (result.rows.length === 0) {
return res.status(404).json({ error: 'Application not found' });
}
const application = result.rows[0];
// Check permissions
Iif (req.user.role === 'candidate') {
const candidateResult = await pool.query(
'SELECT id FROM candidates WHERE user_id = $1',
[req.user.id]
);
if (candidateResult.rows.length === 0 || application.candidate_id !== candidateResult.rows[0].id) {
return res.status(403).json({ error: 'Access denied' });
}
} else Eif (req.user.role === 'employer') {
const employerResult = await pool.query(
'SELECT id FROM employers WHERE user_id = $1',
[req.user.id]
);
Iif (employerResult.rows.length === 0 || application.employer_id !== employerResult.rows[0].id) {
return res.status(403).json({ error: 'Access denied' });
}
}
res.json(application);
} catch (error) {
console.error('Get application error:', error);
res.status(500).json({ error: 'Failed to fetch application' });
}
});
// Create application
router.post('/', authenticateToken, requireRole(['candidate']), [
body('jobId').isUUID(),
body('coverLetter').optional().trim(),
body('notes').optional().trim()
], async (req, res) => {
try {
const errors = validationResult(req);
Iif (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const { jobId, coverLetter, notes } = req.body;
// Get candidate ID for the current user
const candidateResult = await pool.query(
'SELECT id FROM candidates WHERE user_id = $1',
[req.user.id]
);
Iif (candidateResult.rows.length === 0) {
return res.status(400).json({ error: 'Candidate profile not found' });
}
const candidateId = candidateResult.rows[0].id;
// Check if job exists and is active
const jobResult = await pool.query(
'SELECT id, status FROM jobs WHERE id = $1',
[jobId]
);
Iif (jobResult.rows.length === 0) {
return res.status(404).json({ error: 'Job not found' });
}
Iif (jobResult.rows[0].status !== 'active') {
return res.status(400).json({ error: 'Job is not accepting applications' });
}
// Check if application already exists
const existingApplication = await pool.query(
'SELECT id FROM applications WHERE job_id = $1 AND candidate_id = $2',
[jobId, candidateId]
);
Iif (existingApplication.rows.length > 0) {
return res.status(400).json({ error: 'Application already exists' });
}
const result = await pool.query(`
INSERT INTO applications (job_id, candidate_id, cover_letter, notes)
VALUES ($1, $2, $3, $4)
RETURNING *
`, [jobId, candidateId, coverLetter, notes]);
res.status(201).json({
message: 'Application submitted successfully',
application: result.rows[0]
});
} catch (error) {
console.error('Create application error:', error);
res.status(500).json({ error: 'Failed to submit application' });
}
});
// Update application status
router.put('/:id/status', authenticateToken, [
body('status').isIn(['applied', 'reviewed', 'shortlisted', 'interviewed', 'offered', 'rejected', 'withdrawn'])
], async (req, res) => {
try {
const errors = validationResult(req);
Iif (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const { id } = req.params;
const { status } = req.body;
// Check if application exists and user has permission
const applicationResult = await pool.query(`
SELECT a.*, j.employer_id, e.user_id as employer_user_id
FROM applications a
JOIN jobs j ON a.job_id = j.id
JOIN employers e ON j.employer_id = e.id
WHERE a.id = $1
`, [id]);
Iif (applicationResult.rows.length === 0) {
return res.status(404).json({ error: 'Application not found' });
}
const application = applicationResult.rows[0];
// Check permissions
Iif (req.user.role === 'candidate') {
const candidateResult = await pool.query(
'SELECT id FROM candidates WHERE user_id = $1',
[req.user.id]
);
if (candidateResult.rows.length === 0 || application.candidate_id !== candidateResult.rows[0].id) {
return res.status(403).json({ error: 'Access denied' });
}
// Candidates can only withdraw their applications
if (status !== 'withdrawn') {
return res.status(403).json({ error: 'Candidates can only withdraw applications' });
}
} else if (req.user.role === 'employer') {
Iif (application.employer_user_id !== req.user.id) {
return res.status(403).json({ error: 'Access denied' });
}
} else Eif (req.user.role !== 'admin' && req.user.role !== 'recruiter') {
return res.status(403).json({ error: 'Access denied' });
}
const result = await pool.query(
'UPDATE applications SET status = $1, updated_at = CURRENT_TIMESTAMP WHERE id = $2 RETURNING *',
[status, id]
);
res.json({
message: 'Application status updated successfully',
application: result.rows[0]
});
} catch (error) {
console.error('Update application status error:', error);
res.status(500).json({ error: 'Failed to update application status' });
}
});
// Update application notes
router.put('/:id/notes', authenticateToken, [
body('notes').notEmpty().trim()
], async (req, res) => {
try {
const errors = validationResult(req);
Iif (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const { id } = req.params;
const { notes } = req.body;
// Check if application exists and user has permission
const applicationResult = await pool.query(`
SELECT a.*, j.employer_id, e.user_id as employer_user_id
FROM applications a
JOIN jobs j ON a.job_id = j.id
JOIN employers e ON j.employer_id = e.id
WHERE a.id = $1
`, [id]);
Iif (applicationResult.rows.length === 0) {
return res.status(404).json({ error: 'Application not found' });
}
const application = applicationResult.rows[0];
// Check permissions (employers, recruiters, and admins can add notes)
Iif (req.user.role === 'candidate') {
return res.status(403).json({ error: 'Candidates cannot add notes to applications' });
} else if (req.user.role === 'employer') {
Iif (application.employer_user_id !== req.user.id) {
return res.status(403).json({ error: 'Access denied' });
}
} else Eif (req.user.role !== 'admin' && req.user.role !== 'recruiter') {
return res.status(403).json({ error: 'Access denied' });
}
const result = await pool.query(
'UPDATE applications SET notes = $1, updated_at = CURRENT_TIMESTAMP WHERE id = $2 RETURNING *',
[notes, id]
);
res.json({
message: 'Application notes updated successfully',
application: result.rows[0]
});
} catch (error) {
console.error('Update application notes error:', error);
res.status(500).json({ error: 'Failed to update application notes' });
}
});
module.exports = router;
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