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<?php
// Start session if not already started
if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

// Check if user is logged in
$is_logged_in = isset($_SESSION['user_id']);
$is_faculty = $is_logged_in && $_SESSION['user_type'] === 'faculty';
$is_student = $is_logged_in && $_SESSION['user_type'] === 'student';

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Domain Management System</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
    <link href="css/styles.css" rel="stylesheet">
</head>
<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark shadow-sm mb-4">

        <div class="container">

            <a class="navbar-brand" href="index.php">

                <i class="fas fa-database me-2"></i>

                Domain Management System

            </a>

            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">

                <span class="navbar-toggler-icon"></span>

            </button>

            <div class="collapse navbar-collapse" id="navbarNav">

                <ul class="navbar-nav me-auto">

                    <li class="nav-item">

                        <a class="nav-link" href="index.php"><i class="fas fa-home me-1"></i> Home</a>

                    </li>

                    <li class="nav-item">

                        <a class="nav-link" href="domains.php"><i class="fas fa-layer-group me-1"></i> Domains</a>

                    </li>

                    <li class="nav-item">

                        <a class="nav-link" href="projects.php"><i class="fas fa-project-diagram me-1"></i> Projects</a>

                    </li>

                    <?php if (!$is_student): // Only show Students page to faculty ?>

                    <li class="nav-item">

                        <a class="nav-link" href="students.php"><i class="fas fa-user-graduate me-1"></i> Students</a>

                    </li>

                    <?php endif; ?>

                    <?php if ($is_faculty): ?>

                    <li class="nav-item dropdown">

                        <a class="nav-link dropdown-toggle" href="#" id="projectManagementDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">

                            <i class="fas fa-tools me-1"></i> Project Management

                        </a>

                        <ul class="dropdown-menu" aria-labelledby="projectManagementDropdown">

                            <li><a class="dropdown-item" href="project_add.php"><i class="fas fa-plus-circle me-1"></i> Add Project</a></li>

                            <li><a class="dropdown-item" href="project_manage.php"><i class="fas fa-edit me-1"></i> Manage Projects</a></li>

                        </ul>

                    </li>

                    <li class="nav-item">

                        <a class="nav-link" href="admin.php"><i class="fas fa-cogs me-1"></i> Admin Panel</a>

                    </li>

                    <?php endif; ?>

                </ul>

                <ul class="navbar-nav">

                    <?php if ($is_logged_in): ?>

                    <li class="nav-item dropdown">

                        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">

                            <i class="fas fa-user-circle me-1"></i> 

                            <?php echo htmlspecialchars($_SESSION['username']); ?> 

                            (<?php echo ucfirst($_SESSION['user_type']); ?>)

                        </a>

                        <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="navbarDropdown">

                            <?php if ($is_student): ?>

                            <li><a class="dropdown-item" href="my_projects.php"><i class="fas fa-tasks me-1"></i> My Projects</a></li>

                            <?php endif; ?>

                            <li><a class="dropdown-item" href="profile.php"><i class="fas fa-id-card me-1"></i> My Profile</a></li>

                            <li><hr class="dropdown-divider"></li>

                            <li><a class="dropdown-item" href="logout.php"><i class="fas fa-sign-out-alt me-1"></i> Logout</a></li>

                        </ul>

                    </li>

                    <?php else: ?>

                    <li class="nav-item">

                        <a class="nav-link" href="login.php"><i class="fas fa-sign-in-alt me-1"></i> Login</a>

                    </li>

                    <?php endif; ?>

                </ul>

            </div>

        </div>

    </nav>

    

    <div class="container mb-4">

    <main class="container py-4">