// ================== TASK 3(a) ==================
// ICT Module Code Processing using explode() and string functions

if (isset($_GET['submit_modules']) && isset($_GET['modules']) && !empty($_GET['modules'])) {
    $input = $_GET['modules'];
    // Remove spaces and split by comma
    $cleanInput = str_replace(' ', '', $input);
    $moduleCodes = explode(',', $cleanInput);
    
    echo '<h3>Module Details:</h3>';
    echo '<table border="1" cellpadding="10" style="border-collapse: collapse; width: 100%;">';
    echo '<tr style="background: #3498db; color: white;"><th>Module Code</th><th>Year of Offering</th><th>NQF Level</th></tr>';
    
    foreach ($moduleCodes as $code) {
        $code = trim($code);
        if (!empty($code) && strlen($code) >= 5) {
            $year = $code[3]; // 4th character (0-indexed)
            $nqfLevel = $code[4]; // 5th character (0-indexed)
            echo "<tr>";
            echo "<td><strong>$code</strong></td>";
            echo "<td>$year" . "nd Year</td>";
            echo "<td>NQF Level $nqfLevel</td>";
            echo "</tr>";
        }
    }
    echo '</table>';
}

// ================== TASK 3(b) ==================
// DateTime and Age Calculation

function displayBirthdateAndAge($dateTime) {
    // Display in day/month/year format
    $formattedDate = $dateTime->format('d/m/Y');
    
    // Calculate age
    $now = new DateTime();
    $age = $now->diff($dateTime);
    $ageYears = $age->y;
    
    echo "<p><strong>Birthdate:</strong> $formattedDate</p>";
    echo "<p><strong>Age:</strong> $ageYears years</p>";
}

// Test with three DateTime objects
$date1 = DateTime::createFromFormat('d-m-Y', '29-03-1980');
displayBirthdateAndAge($date1);

$date2 = new DateTime();
displayBirthdateAndAge($date2);

$date3 = DateTime::createFromFormat('d-m-Y', '31-12-1996');
displayBirthdateAndAge($date3);

// ================== TASK 3(c) ==================
// Array Operations - range(), rsort(), asort()

// Create monthsNum array using range()
$monthsNum = range(1, 12);

// Create monthsString array
$monthsString = array(
    'January', 'February', 'March', 'April', 'May', 'June',
    'July', 'August', 'September', 'October', 'November', 'December'
);

// Display mapping using for loop
echo "<h3>Months Mapping:</h3>";
for ($i = 0; $i < count($monthsNum); $i++) {
    echo "{$monthsNum[$i]} - {$monthsString[$i]}<br>";
}

// Invoke rsort() on monthsString
rsort($monthsString);
echo "<h3>After rsort() on monthsString:</h3>";
foreach ($monthsString as $month) {
    echo "$month<br>";
}

// Create associative array
$assocMonths = array(
    1 => 'January', 2 => 'February', 3 => 'March', 4 => 'April',
    5 => 'May', 6 => 'June', 7 => 'July', 8 => 'August',
    9 => 'September', 10 => 'October', 11 => 'November', 12 => 'December'
);

echo "<h3>Associative Array:</h3>";
foreach ($assocMonths as $key => $value) {
    echo "$key - $value<br>";
}

// Invoke asort() on associative array
asort($assocMonths);
echo "<h3>After asort() on Associative Array:</h3>";
foreach ($assocMonths as $key => $value) {
    echo "$key - $value<br>";
}