<?php
// Database connection
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "popularcomputer";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

echo "<h2>Adding attempt_date column to student_exams table</h2>";

// Add attempt_date column
$addColumn = "ALTER TABLE student_exams 
              ADD COLUMN attempt_date DATETIME DEFAULT CURRENT_TIMESTAMP AFTER attempt_number";

if ($conn->query($addColumn) === TRUE) {
    echo "<p>Successfully added attempt_date column to student_exams table.</p>";
    
    // Update existing records to set attempt_date to created_at
    $updateRecords = "UPDATE student_exams SET attempt_date = created_at";
    if ($conn->query($updateRecords) === TRUE) {
        echo "<p>Updated existing records with attempt_date values.</p>";
    } else {
        echo "<p>Error updating records: " . $conn->error . "</p>";
    }
} else {
    echo "<p>Error adding column: " . $conn->error . "</p>";
}

// Close connection
$conn->close();

echo "<a href='student/exam-results.php'>Go to Exam Results</a>";
?>