// ================== TASK 1 ==================
// Extracurricular Activity Registration Form

// Activities array with cost and type
$activities = [
    'soccer' => ['label' => 'Soccer', 'cost' => 150, 'type' => 'paid'],
    'netball' => ['label' => 'Netball', 'cost' => 150, 'type' => 'paid'],
    'chess' => ['label' => 'Chess', 'cost' => 100, 'type' => 'paid'],
    'pottery' => ['label' => 'Pottery', 'cost' => 0, 'type' => 'free'],
    'choir' => ['label' => 'Choir', 'cost' => 0, 'type' => 'free'],
    'golf' => ['label' => 'Golf', 'cost' => 0, 'type' => 'free']
];

// ================== FORM PROCESSING ==================
if (isset($_GET['submit'])) {
    $fullname = isset($_GET['fullname']) ? trim($_GET['fullname']) : '';
    $grade = isset($_GET['grade']) ? $_GET['grade'] : '';
    $selectedActivities = isset($_GET['activities']) ? $_GET['activities'] : array();
    
    // Validation
    $errors = array();
    
    if (empty($fullname)) {
        $errors[] = "Please enter the learner's full name.";
    }
    
    if (empty($grade)) {
        $errors[] = "Please select a grade.";
    }
    
    if (count($selectedActivities) < 2) {
        $errors[] = "Please select at least two extracurricular activities.";
    }
    
    // Display errors or success
    if (!empty($errors)) {
        echo '<div class="error">';
        echo '<strong>Form incomplete:</strong><ul>';
        foreach ($errors as $error) {
            echo "<li>$error</li>";
        }
        echo '</ul></div>';
    } else {
        // Calculate total cost
        $totalCost = 0;
        $activityNames = array();
        foreach ($selectedActivities as $activityKey) {
            if (isset($activities[$activityKey])) {
                $totalCost += $activities[$activityKey]['cost'];
                $activityNames[] = $activities[$activityKey]['label'];
            }
        }
        
        // Display registration summary
        echo '<div class="success">';
        echo "<h3>Registration Successful!</h3>";
        echo "<p><strong>Learner:</strong> " . htmlspecialchars($fullname) . "</p>";
        echo "<p><strong>Grade:</strong> " . htmlspecialchars($grade) . "</p>";
        echo "<p><strong>Activities registered for:</strong> " . implode(', ', $activityNames) . "</p>";
        echo "<p><strong>Total amount to be paid:</strong> R" . number_format($totalCost, 2) . "</p>";
        echo '</div>';
    }
}

// ================== GENERATING GRADE DROPDOWN ==================
for ($i = 1; $i <= 7; $i++) {
    $selected = (isset($_GET['grade']) && $_GET['grade'] == $i) ? 'selected' : '';
    echo "<option value='$i' $selected>Grade $i</option>";
}

// ================== GENERATING CHECKBOXES ==================
foreach ($activities as $key => $activity) {
    $costDisplay = $activity['cost'] == 0 ? 'Free' : 'R' . $activity['cost'];
    $checked = (isset($_GET['activities']) && in_array($key, $_GET['activities'])) ? 'checked' : '';
    echo "<label>
            <input type='checkbox' name='activities[]' value='$key' $checked>
            {$activity['label']} ($costDisplay)
          </label>";
}