start_live_class.php

<?php
session_start();
require "config.php";

if (!isset($_SESSION['id']) || $_SESSION['role'] !== 'teacher') {
    die("Access denied");
}

$class_id = (int)($_GET['id'] ?? 0);
if ($class_id <= 0) {
    die("Invalid class ID");
}

/* ===========================
   GET TEACHER.ID
=========================== */
$stmt = $pdo->prepare("SELECT id FROM teachers WHERE user_id = ?");
$stmt->execute([$_SESSION['id']]);
$teacher_id = $stmt->fetchColumn();

if (!$teacher_id) {
    die("Teacher profile not found");
}

/* ===========================
   START LIVE CLASS
=========================== */
$stmt = $pdo->prepare("
    UPDATE live_classes 
    SET status = 'live'
    WHERE id = ? AND teacher_id = ?
");
$stmt->execute([$class_id, $teacher_id]);

if ($stmt->rowCount() === 0) {
    die("Unable to start live class");
}

header("Location: live_class_room.php?id=$class_id");
exit;