<?php
require_once __DIR__ . '/includes/app.php';

// Mock teacher authentication for now
$teacher_id = 1;
$db = db();
$action = $_GET['action'] ?? 'list';
$course_id = (int)($_GET['course_id'] ?? 0);
$activity_id = (int)($_GET['activity_id'] ?? 0);

// Helper to check course ownership
function owns_course($db, $course_id, $teacher_id) {
    $stmt = $db->prepare("SELECT id, name_en, name_ar FROM courses WHERE id = ? AND teacher_id = ?");
    $stmt->execute([$course_id, $teacher_id]);
    return $stmt->fetch(PDO::FETCH_ASSOC);
}

// Handle POST actions for activities and assessments
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $post_action = $_POST['action'] ?? '';
    
    if ($post_action === 'add_activity' || $post_action === 'edit_activity') {
        $c_id = (int)$_POST['course_id'];
        $course = owns_course($db, $c_id, $teacher_id);
        if ($course) {
            $act_id = (int)($_POST['activity_id'] ?? 0);
            $title_en = $_POST['title_en'] ?? '';
            $title_ar = $_POST['title_ar'] ?? '';
            $desc_en = $_POST['description_en'] ?? '';
            $desc_ar = $_POST['description_ar'] ?? '';
            
            if ($post_action === 'add_activity') {
                $stmt = $db->prepare("INSERT INTO course_activities (course_id, title_en, title_ar, description_en, description_ar) VALUES (?, ?, ?, ?, ?)");
                $stmt->execute([$c_id, $title_en, $title_ar, $desc_en, $desc_ar]);
            } else if ($post_action === 'edit_activity' && $act_id > 0) {
                $stmt = $db->prepare("UPDATE course_activities SET title_en = ?, title_ar = ?, description_en = ?, description_ar = ? WHERE id = ? AND course_id = ?");
                $stmt->execute([$title_en, $title_ar, $desc_en, $desc_ar, $act_id, $c_id]);
            }
        }
        header("Location: " . app_url('teacher.php', ['action' => 'activities', 'course_id' => $c_id]));
        exit;
    }
    
    if ($post_action === 'add_live' || $post_action === 'edit_live') {
        $c_id = (int)$_POST['course_id'];
        $live_id = (int)($_POST['live_id'] ?? 0);
        $title = $_POST['title'] ?? '';
        $scheduled_at = $_POST['scheduled_at'] ?? '';
        $meet_url = trim($_POST['meet_url'] ?? '');
        
        if (owns_course($db, $c_id, $teacher_id)) {
            if ($post_action === 'add_live') {
                $room_name = 'room_' . substr(md5(uniqid()), 0, 10);
                $stmt = $db->prepare("INSERT INTO course_live_lessons (course_id, title, scheduled_at, room_name, meet_url) VALUES (?, ?, ?, ?, ?)");
                $stmt->execute([$c_id, $title, $scheduled_at, $room_name, $meet_url]);
            } else if ($post_action === 'edit_live' && $live_id > 0) {
                $stmt = $db->prepare("UPDATE course_live_lessons SET title = ?, scheduled_at = ?, meet_url = ? WHERE id = ? AND course_id = ?");
                $stmt->execute([$title, $scheduled_at, $meet_url, $live_id, $c_id]);
            }
        }
        header("Location: " . app_url('teacher.php', ['action' => 'live', 'course_id' => $c_id]));
        exit;
    }
    
    if ($post_action === 'delete_live') {
        $c_id = (int)$_POST['course_id'];
        $live_id = (int)$_POST['live_id'];
        if (owns_course($db, $c_id, $teacher_id)) {
            $stmt = $db->prepare("DELETE FROM course_live_lessons WHERE id = ? AND course_id = ?");
            $stmt->execute([$live_id, $c_id]);
        }
        header("Location: " . app_url('teacher.php', ['action' => 'live', 'course_id' => $c_id]));
        exit;
    }

    if ($post_action === 'delete_activity') {
        $c_id = (int)$_POST['course_id'];
        $act_id = (int)$_POST['activity_id'];
        if (owns_course($db, $c_id, $teacher_id)) {
            $stmt = $db->prepare("DELETE FROM course_activities WHERE id = ? AND course_id = ?");
            $stmt->execute([$act_id, $c_id]);
        }
        header("Location: " . app_url('teacher.php', ['action' => 'activities', 'course_id' => $c_id]));
        exit;
    }
    
    if ($post_action === 'save_assessments') {
        $c_id = (int)$_POST['course_id'];
        $act_id = (int)$_POST['activity_id'];
        if (owns_course($db, $c_id, $teacher_id)) {
            $scores = $_POST['scores'] ?? [];
            $feedbacks = $_POST['feedbacks'] ?? [];
            
            $stmt = $db->prepare("INSERT INTO student_assessments (activity_id, student_id, score, feedback) VALUES (?, ?, ?, ?) ON DUPLICATE KEY UPDATE score = VALUES(score), feedback = VALUES(feedback)");
            foreach ($scores as $s_id => $score) {
                $s_id = (int)$s_id;
                $score_val = ($score !== '') ? (float)$score : null;
                $fb = $feedbacks[$s_id] ?? '';
                $stmt->execute([$act_id, $s_id, $score_val, $fb]);
            }
        }
        header("Location: " . app_url('teacher.php', ['action' => 'assessments', 'course_id' => $c_id, 'activity_id' => $act_id]));
        exit;
    }
}

render_head(
    t('Teacher workspace', 'مساحة المعلم'),
    t('Manage your courses, students, and activities.', 'إدارة دوراتك وطلابك وأنشطتك.')
);
render_nav('teacher.php');
?>
<main class="py-5">
  <div class="container">
    <div class="d-flex justify-content-between align-items-center mb-4">
        <div>
            <span class="eyebrow"><?= h(t('Teacher workspace', 'مساحة المعلم')) ?></span>
            <h1 class="section-title mb-0"><?= h(t('My Courses', 'دوراتي')) ?></h1>
        </div>
        <?php if ($action !== 'list'): ?>
            <a href="teacher.php" class="btn btn-outline-dark"><?= h(t('Back', 'العودة للدورات')) ?></a>
        <?php endif; ?>
    </div>

    <?php if ($action === 'list'): ?>
        <?php
        $stmt = $db->prepare("SELECT c.*, (SELECT COUNT(*) FROM course_students cs WHERE cs.course_id = c.id) as students_count FROM courses c WHERE c.teacher_id = ? AND c.status = 'active'");
        $stmt->execute([$teacher_id]);
        $courses = $stmt->fetchAll(PDO::FETCH_ASSOC);
        ?>
        <div class="row g-4">
            <?php foreach ($courses as $c): ?>
                <div class="col-md-6 col-lg-4">
                    <article class="panel-card h-100">
                        <?php if ($c['picture']): ?>
                            <img src="<?= h($c['picture']) ?>" class="img-fluid rounded mb-3" style="object-fit:cover; height:150px; width:100%;" alt="">
                        <?php else: ?>
                            <div class="bg-light rounded mb-3 d-flex align-items-center justify-content-center" style="height:150px;">
                                <span class="text-muted">No Image</span>
                            </div>
                        <?php endif; ?>
                        
                        <h2 class="h5 mb-2"><?= h(t($c['name_en'], $c['name_ar'])) ?></h2>
                        <div class="d-flex justify-content-between text-secondary small mb-3">
                            <span><?= h(t('Students:', 'الطلاب:')) ?> <?= h($c['students_count']) ?></span>
                        </div>
                        
                        <div class="d-flex flex-column gap-2">
                            <a href="<?= app_url('teacher.php', ['action' => 'students', 'course_id' => $c['id']]) ?>" class="btn btn-sm btn-outline-dark"><?= h(t('View Students', 'عرض الطلاب')) ?></a>
                            <a href="<?= app_url('teacher.php', ['action' => 'activities', 'course_id' => $c['id']]) ?>" class="btn btn-sm btn-outline-dark"><?= h(t('Manage Activities', 'إدارة الأنشطة')) ?></a>
                            <a href="<?= app_url('teacher.php', ['action' => 'live', 'course_id' => $c['id']]) ?>" class="btn btn-sm btn-danger text-white"><?= h(t('Live Lessons', 'دروس البث المباشر')) ?></a>
                        </div>
                    </article>
                </div>
            <?php endforeach; ?>
            <?php if (empty($courses)): ?>
                <div class="col-12"><div class="alert alert-info"><?= h(t('No active courses found assigned to you.', 'لم يتم العثور على دورات نشطة مخصصة لك.')) ?></div></div>
            <?php endif; ?>
        </div>

    <?php elseif ($action === 'students' && $course_id > 0): ?>
        <?php
        $course = owns_course($db, $course_id, $teacher_id);
        if (!$course) die('Unauthorized');
        
        $stmt = $db->prepare("
            SELECT s.id, s.full_name, s.email, s.whatsapp, cs.assigned_at 
            FROM course_students cs 
            JOIN student_subscriptions s ON cs.student_id = s.id 
            WHERE cs.course_id = ?
            ORDER BY cs.assigned_at DESC
        ");
        $stmt->execute([$course_id]);
        $students = $stmt->fetchAll(PDO::FETCH_ASSOC);
        ?>
        <h2 class="h4 mb-4"><?= h(t($course['name_en'], $course['name_ar'])) ?> - <?= h(t('Students', 'الطلاب')) ?></h2>
        <div class="panel-card">
            <div class="table-responsive">
                <table class="table table-hover align-middle mb-0">
                    <thead>
                        <tr>
                            <th><?= h(t('Name', 'الاسم')) ?></th>
                            <th><?= h(t('Email', 'البريد الإلكتروني')) ?></th>
                            <th><?= h(t('WhatsApp', 'واتساب')) ?></th>
                            <th><?= h(t('Enrolled At', 'تاريخ التسجيل')) ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach($students as $s): ?>
                        <tr>
                            <td><?= h($s['full_name']) ?></td>
                            <td><?= h($s['email']) ?></td>
                            <td><?= h($s['whatsapp']) ?></td>
                            <td><?= h(date('Y-m-d', strtotime($s['assigned_at']))) ?></td>
                        </tr>
                        <?php endforeach; ?>
                        <?php if(empty($students)): ?>
                            <tr><td colspan="4" class="text-center text-muted"><?= h(t('No students enrolled yet.', 'لم يقم أي طالب بالتسجيل بعد.')) ?></td></tr>
                        <?php endif; ?>
                    </tbody>
                </table>
            </div>
        </div>

    <?php elseif ($action === 'activities' && $course_id > 0): ?>
        <?php
        $course = owns_course($db, $course_id, $teacher_id);
        if (!$course) die('Unauthorized');
        
        $stmt = $db->prepare("SELECT * FROM course_activities WHERE course_id = ? ORDER BY created_at DESC");
        $stmt->execute([$course_id]);
        $activities = $stmt->fetchAll(PDO::FETCH_ASSOC);
        ?>
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h2 class="h4 mb-0"><?= h(t($course['name_en'], $course['name_ar'])) ?> - <?= h(t('Activities', 'الأنشطة')) ?></h2>
            <button class="btn btn-dark" data-bs-toggle="modal" data-bs-target="#activityModal" onclick="resetActivityForm()">
                <?= h(t('+ Add Activity', '+ إضافة نشاط')) ?>
            </button>
        </div>
        
        <div class="panel-card">
            <div class="table-responsive">
                <table class="table table-hover align-middle mb-0">
                    <thead>
                        <tr>
                            <th><?= h(t('Title (EN)', 'العنوان (إنجليزي)')) ?></th>
                            <th><?= h(t('Title (AR)', 'العنوان (عربي)')) ?></th>
                            <th><?= h(t('Date', 'التاريخ')) ?></th>
                            <th><?= h(t('Actions', 'الإجراءات')) ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach($activities as $act): ?>
                        <tr>
                            <td><?= h($act['title_en']) ?></td>
                            <td><?= h($act['title_ar']) ?></td>
                            <td><?= h(date('Y-m-d', strtotime($act['created_at']))) ?></td>
                            <td>
                                <div class="d-flex gap-2">
                                    <a href="<?= app_url('teacher.php', ['action' => 'assessments', 'course_id' => $course_id, 'activity_id' => $act['id']]) ?>" class="btn btn-sm btn-info text-white"><?= h(t('Assess', 'تقييم')) ?></a>
                                    <button class="btn btn-sm btn-outline-secondary" onclick="editActivity(<?= htmlspecialchars(json_encode($act)) ?>)"><?= h(t('Edit', 'تعديل')) ?></button>
                                    <form method="post" class="d-inline" onsubmit="return confirm('<?= h(t('Are you sure?', 'هل أنت متأكد؟')) ?>')">
                                        <input type="hidden" name="action" value="delete_activity">
                                        <input type="hidden" name="course_id" value="<?= $course_id ?>">
                                        <input type="hidden" name="activity_id" value="<?= $act['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-outline-danger"><?= h(t('Del', 'حذف')) ?></button>
                                    </form>
                                </div>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                        <?php if(empty($activities)): ?>
                            <tr><td colspan="4" class="text-center text-muted"><?= h(t('No activities found.', 'لم يتم العثور على أنشطة.')) ?></td></tr>
                        <?php endif; ?>
                    </tbody>
                </table>
            </div>
        </div>

        <!-- Activity Modal -->
        <div class="modal fade" id="activityModal" tabindex="-1" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <form method="post">
                        <div class="modal-header">
                            <h5 class="modal-title" id="activityModalLabel"><?= h(t('Activity', 'النشاط')) ?></h5>
                            <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                        </div>
                        <div class="modal-body">
                            <input type="hidden" name="action" id="modal_action" value="add_activity">
                            <input type="hidden" name="course_id" value="<?= $course_id ?>">
                            <input type="hidden" name="activity_id" id="modal_activity_id" value="">
                            
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Title (EN)', 'العنوان (إنجليزي)')) ?></label>
                                <input type="text" name="title_en" id="modal_title_en" class="form-control" required>
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Title (AR)', 'العنوان (عربي)')) ?></label>
                                <input type="text" name="title_ar" id="modal_title_ar" class="form-control" required dir="rtl">
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Description (EN)', 'الوصف (إنجليزي)')) ?></label>
                                <textarea name="description_en" id="modal_desc_en" class="form-control" rows="3"></textarea>
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Description (AR)', 'الوصف (عربي)')) ?></label>
                                <textarea name="description_ar" id="modal_desc_ar" class="form-control" rows="3" dir="rtl"></textarea>
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Google Meet URL', 'رابط Google Meet')) ?> <small class="text-muted"><?= h(t('(Optional, overrides platform studio)', '(اختياري، يحل محل استوديو المنصة)')) ?></small></label>
                                <input type="url" name="meet_url" id="modal_live_meet_url" class="form-control" placeholder="https://meet.google.com/xxx-xxxx-xxx">
                            </div>
                        </div>
                        <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal"><?= h(t('Cancel', 'إلغاء')) ?></button>
                            <button type="submit" class="btn btn-dark"><?= h(t('Save', 'حفظ')) ?></button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
        <script>
            function resetActivityForm() {
                document.getElementById('modal_action').value = 'add_activity';
                document.getElementById('modal_activity_id').value = '';
                document.getElementById('modal_title_en').value = '';
                document.getElementById('modal_title_ar').value = '';
                document.getElementById('modal_desc_en').value = '';
                document.getElementById('modal_desc_ar').value = '';
            }
            function editActivity(act) {
                document.getElementById('modal_action').value = 'edit_activity';
                document.getElementById('modal_activity_id').value = act.id;
                document.getElementById('modal_title_en').value = act.title_en;
                document.getElementById('modal_title_ar').value = act.title_ar;
                document.getElementById('modal_desc_en').value = act.description_en;
                document.getElementById('modal_desc_ar').value = act.description_ar;
                var modal = new bootstrap.Modal(document.getElementById('activityModal'));
                modal.show();
            }
        </script>

    <?php elseif ($action === 'live' && $course_id > 0): ?>
        <?php
        $course = owns_course($db, $course_id, $teacher_id);
        if (!$course) die('Unauthorized');
        
        $stmt = $db->prepare("SELECT * FROM course_live_lessons WHERE course_id = ? ORDER BY scheduled_at ASC");
        $stmt->execute([$course_id]);
        $lessons = $stmt->fetchAll(PDO::FETCH_ASSOC);
        ?>
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h2 class="h4 mb-0"><?= h(t($course['name_en'], $course['name_ar'])) ?> - <?= h(t('Live Lessons', 'دروس البث المباشر')) ?></h2>
            <button class="btn btn-danger text-white" data-bs-toggle="modal" data-bs-target="#liveModal" onclick="resetLiveForm()">
                <?= h(t('+ Schedule Lesson', '+ جدولة درس')) ?>
            </button>
        </div>
        
        <div class="panel-card">
            <div class="table-responsive">
                <table class="table table-hover align-middle mb-0">
                    <thead>
                        <tr>
                            <th><?= h(t('Title', 'العنوان')) ?></th>
                            <th><?= h(t('Scheduled At', 'موعد الدرس')) ?></th>
                            <th><?= h(t('Status', 'الحالة')) ?></th>
                            <th><?= h(t('Actions', 'الإجراءات')) ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach($lessons as $les): ?>
                        <tr>
                            <td><?= h($les['title']) ?></td>
                            <td><?= h(date('Y-m-d H:i', strtotime($les['scheduled_at']))) ?></td>
                            <td>
                                <?php if($les['status'] === 'scheduled'): ?>
                                    <span class="badge bg-warning text-dark"><?= h(t('Scheduled', 'مجدول')) ?></span>
                                <?php elseif($les['status'] === 'live'): ?>
                                    <span class="badge bg-danger animate-pulse"><?= h(t('LIVE', 'مباشر')) ?></span>
                                <?php else: ?>
                                    <span class="badge bg-secondary"><?= h(t('Ended', 'منتهي')) ?></span>
                                <?php endif; ?>
                            </td>
                            <td>
                                <div class="d-flex gap-2">
                                    <?php if($les['status'] !== 'ended'): ?>
                                        <a href="live_lesson.php?id=<?= $les['id'] ?>&as=teacher" class="btn btn-sm btn-success text-white">
                                            <?= h(t('Enter Studio', 'دخول الاستوديو')) ?>
                                        </a>
                                    <?php endif; ?>
                                    <button class="btn btn-sm btn-outline-secondary" onclick="editLive(<?= htmlspecialchars(json_encode($les)) ?>)"><?= h(t('Edit', 'تعديل')) ?></button>
                                    <form method="post" class="d-inline" onsubmit="return confirm('<?= h(t('Are you sure?', 'هل أنت متأكد؟')) ?>')">
                                        <input type="hidden" name="action" value="delete_live">
                                        <input type="hidden" name="course_id" value="<?= $course_id ?>">
                                        <input type="hidden" name="live_id" value="<?= $les['id'] ?>">
                                        <button type="submit" class="btn btn-sm btn-outline-danger"><?= h(t('Del', 'حذف')) ?></button>
                                    </form>
                                </div>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                        <?php if(empty($lessons)): ?>
                            <tr><td colspan="4" class="text-center text-muted"><?= h(t('No live lessons scheduled.', 'لا يوجد دروس مجدولة.')) ?></td></tr>
                        <?php endif; ?>
                    </tbody>
                </table>
            </div>
        </div>

        <!-- Live Modal -->
        <div class="modal fade" id="liveModal" tabindex="-1" aria-hidden="true">
            <div class="modal-dialog">
                <div class="modal-content">
                    <form method="post">
                        <div class="modal-header">
                            <h5 class="modal-title"><?= h(t('Live Lesson', 'الدرس المباشر')) ?></h5>
                            <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                        </div>
                        <div class="modal-body">
                            <input type="hidden" name="action" id="modal_live_action" value="add_live">
                            <input type="hidden" name="course_id" value="<?= $course_id ?>">
                            <input type="hidden" name="live_id" id="modal_live_id" value="">
                            
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Lesson Title', 'عنوان الدرس')) ?></label>
                                <input type="text" name="title" id="modal_live_title" class="form-control" required>
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Scheduled Time', 'وقت الدرس')) ?></label>
                                <input type="datetime-local" name="scheduled_at" id="modal_live_time" class="form-control" required>
                            </div>
                            <div class="mb-3">
                                <label class="form-label"><?= h(t('Google Meet URL', 'رابط Google Meet')) ?> <small class="text-muted"><?= h(t('(Optional, overrides platform studio)', '(اختياري، يحل محل استوديو المنصة)')) ?></small></label>
                                <input type="url" name="meet_url" id="modal_live_meet_url" class="form-control" placeholder="https://meet.google.com/xxx-xxxx-xxx">
                            </div>
                        </div>
                        <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" data-bs-dismiss="modal"><?= h(t('Cancel', 'إلغاء')) ?></button>
                            <button type="submit" class="btn btn-danger"><?= h(t('Save', 'حفظ')) ?></button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
        <script>
            function resetLiveForm() {
                document.getElementById('modal_live_action').value = 'add_live';
                document.getElementById('modal_live_id').value = '';
                document.getElementById('modal_live_title').value = '';
                document.getElementById('modal_live_time').value = '';
                document.getElementById('modal_live_meet_url').value = '';
            }
            function editLive(les) {
                document.getElementById('modal_live_action').value = 'edit_live';
                document.getElementById('modal_live_id').value = les.id;
                document.getElementById('modal_live_title').value = les.title;
                document.getElementById('modal_live_time').value = les.scheduled_at.replace(' ', 'T').substring(0, 16);
                document.getElementById('modal_live_meet_url').value = les.meet_url ? les.meet_url : '';
                var modal = new bootstrap.Modal(document.getElementById('liveModal'));
                modal.show();
            }
        </script>

    <?php elseif ($action === 'assessments' && $course_id > 0 && $activity_id > 0): ?>
        <?php
        $course = owns_course($db, $course_id, $teacher_id);
        if (!$course) die('Unauthorized');
        
        $stmt = $db->prepare("SELECT title_en, title_ar FROM course_activities WHERE id = ? AND course_id = ?");
        $stmt->execute([$activity_id, $course_id]);
        $activity = $stmt->fetch(PDO::FETCH_ASSOC);
        if (!$activity) die('Activity not found');

        $stmt = $db->prepare("
            SELECT s.id as student_id, s.full_name, sa.score, sa.feedback
            FROM course_students cs
            JOIN student_subscriptions s ON cs.student_id = s.id
            LEFT JOIN student_assessments sa ON sa.student_id = s.id AND sa.activity_id = ?
            WHERE cs.course_id = ?
            ORDER BY s.full_name ASC
        ");
        $stmt->execute([$activity_id, $course_id]);
        $students = $stmt->fetchAll(PDO::FETCH_ASSOC);
        ?>
        
        <div class="d-flex justify-content-between align-items-center mb-4">
            <div>
                <h2 class="h4 mb-1"><?= h(t($activity['title_en'], $activity['title_ar'])) ?> - <?= h(t('Assessments', 'التقييمات')) ?></h2>
                <p class="text-secondary mb-0"><?= h(t($course['name_en'], $course['name_ar'])) ?></p>
            </div>
            <a href="<?= app_url('teacher.php', ['action' => 'activities', 'course_id' => $course_id]) ?>" class="btn btn-outline-dark"><?= h(t('Back to Activities', 'العودة للأنشطة')) ?></a>
        </div>
        
        <div class="panel-card">
            <form method="post">
                <input type="hidden" name="action" value="save_assessments">
                <input type="hidden" name="course_id" value="<?= $course_id ?>">
                <input type="hidden" name="activity_id" value="<?= $activity_id ?>">
                
                <div class="table-responsive mb-3">
                    <table class="table table-hover align-middle mb-0">
                        <thead>
                            <tr>
                                <th style="width: 30%"><?= h(t('Student', 'الطالب')) ?></th>
                                <th style="width: 20%"><?= h(t('Score', 'الدرجة')) ?></th>
                                <th style="width: 50%"><?= h(t('Feedback', 'الملاحظات')) ?></th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php foreach($students as $s): ?>
                            <tr>
                                <td><?= h($s['full_name']) ?></td>
                                <td>
                                    <input type="number" step="0.01" class="form-control" name="scores[<?= $s['student_id'] ?>]" value="<?= h($s['score'] !== null ? $s['score'] : '') ?>" placeholder="0.00">
                                </td>
                                <td>
                                    <input type="text" class="form-control" name="feedbacks[<?= $s['student_id'] ?>]" value="<?= h($s['feedback']) ?>" placeholder="<?= h(t('Optional note...', 'ملاحظة اختيارية...')) ?>">
                                </td>
                            </tr>
                            <?php endforeach; ?>
                            <?php if(empty($students)): ?>
                                <tr><td colspan="3" class="text-center text-muted"><?= h(t('No students found to assess.', 'لا يوجد طلاب لتقييمهم.')) ?></td></tr>
                            <?php endif; ?>
                        </tbody>
                    </table>
                </div>
                
                <?php if(!empty($students)): ?>
                    <div class="text-end">
                        <button type="submit" class="btn btn-dark px-4"><?= h(t('Save All Grades', 'حفظ كل الدرجات')) ?></button>
                    </div>
                <?php endif; ?>
            </form>
        </div>
    <?php endif; ?>
  </div>
</main>
<?php render_footer(); ?>