<?php
// Start session
session_start();

// Include database configuration
require_once '../../config/database.php';

// Check if user is logged in and has admin or director role
if (!isset($_SESSION['user_id']) || ($_SESSION['role'] !== 'admin' && $_SESSION['role'] !== 'director')) {
    echo json_encode(['error' => 'Unauthorized access']);
    exit;
}

// Check if question_id is provided
if (!isset($_POST['question_id']) || empty($_POST['question_id'])) {
    echo "Invalid question ID";
    exit;
}

$question_id = $_POST['question_id'];

// Get question details
$question_query = "SELECT q.*, b.title as bank_title, c.title as course_title 
                   FROM questions q 
                   LEFT JOIN question_banks b ON q.question_bank_id = b.id
                   LEFT JOIN courses c ON b.course_id = c.id 
                   WHERE q.id = ?";
try {
    $stmt = $conn->prepare($question_query);
    $stmt->bind_param("i", $question_id);
    $stmt->execute();
    $result = $stmt->get_result();

    if ($result->num_rows === 0) {
        echo "Question not found";
        exit;
    }

    $question = $result->fetch_assoc();
} catch (Exception $e) {
    echo "Error retrieving question: " . $e->getMessage();
    exit;
}

// Get options if it's a choice question
$options = [];
if ($question['question_type'] === 'multiple_choice' || $question['question_type'] === 'true_false') {
    try {
        $options_query = "SELECT * FROM question_options WHERE question_id = ? ORDER BY id";
        $options_stmt = $conn->prepare($options_query);
        $options_stmt->bind_param("i", $question_id);
        $options_stmt->execute();
        $options_result = $options_stmt->get_result();
        
        while ($option = $options_result->fetch_assoc()) {
            $options[] = $option;
        }
    } catch (Exception $e) {
        // Handle the case when there's no question_options table or no options
        // For older schema that might have used option_a, option_b, etc.
        if (isset($question['option_a']) && !empty($question['option_a'])) {
            $options[] = ['id' => 'a', 'option_text' => $question['option_a'], 'is_correct' => $question['correct_answer'] == 'a'];
        }
        if (isset($question['option_b']) && !empty($question['option_b'])) {
            $options[] = ['id' => 'b', 'option_text' => $question['option_b'], 'is_correct' => $question['correct_answer'] == 'b'];
        }
        if (isset($question['option_c']) && !empty($question['option_c'])) {
            $options[] = ['id' => 'c', 'option_text' => $question['option_c'], 'is_correct' => $question['correct_answer'] == 'c'];
        }
        if (isset($question['option_d']) && !empty($question['option_d'])) {
            $options[] = ['id' => 'd', 'option_text' => $question['option_d'], 'is_correct' => $question['correct_answer'] == 'd'];
        }
    }
}

// Determine difficulty field
$difficulty = isset($question['difficulty']) ? $question['difficulty'] : 
             (isset($question['difficulty_level']) ? $question['difficulty_level'] : 'Unknown');
?>

<div class="question-info">
    <div class="mb-3">
        <h6 class="font-weight-bold">Question:</h6>
        <p><?php echo nl2br(htmlspecialchars($question['question_text'])); ?></p>
    </div>
    
    <div class="mb-3">
        <h6 class="font-weight-bold">Bank:</h6>
        <p><?php echo htmlspecialchars($question['bank_title'] ?? 'Unknown'); ?> 
           <?php if (!empty($question['course_title'])): ?>
              (<?php echo htmlspecialchars($question['course_title']); ?>)
           <?php endif; ?>
        </p>
    </div>
    
    <div class="mb-3">
        <h6 class="font-weight-bold">Type:</h6>
        <p>
            <?php if ($question['question_type'] === 'true_false'): ?>
                <span class="badge bg-info">True/False</span>
            <?php elseif ($question['question_type'] === 'multiple_choice'): ?>
                <span class="badge bg-primary">Multiple Choice</span>
            <?php elseif ($question['question_type'] === 'short_answer'): ?>
                <span class="badge bg-secondary">Short Answer</span>
            <?php elseif ($question['question_type'] === 'essay'): ?>
                <span class="badge bg-warning">Essay</span>
            <?php else: ?>
                <span class="badge bg-secondary"><?php echo ucfirst($question['question_type']); ?></span>
            <?php endif; ?>
        </p>
    </div>

    <div class="mb-3">
        <h6 class="font-weight-bold">Difficulty:</h6>
        <p>
            <?php 
            $difficulty_class = '';
            switch ($difficulty) {
                case 'easy':
                    $difficulty_class = 'success';
                    break;
                case 'medium':
                    $difficulty_class = 'warning';
                    break;
                case 'hard':
                    $difficulty_class = 'danger';
                    break;
                default:
                    $difficulty_class = 'secondary';
            }
            ?>
            <span class="badge bg-<?php echo $difficulty_class; ?>">
                <?php echo ucfirst($difficulty); ?>
            </span>
        </p>
    </div>
    
    <div class="mb-3">
        <h6 class="font-weight-bold">Marks:</h6>
        <p><?php echo $question['marks']; ?></p>
    </div>
    
    <?php if ($question['question_type'] === 'multiple_choice' || $question['question_type'] === 'true_false'): ?>
        <div class="mb-3">
            <h6 class="font-weight-bold">Options:</h6>
            <ul class="list-group">
                <?php foreach ($options as $option): ?>
                    <li class="list-group-item <?php echo $option['is_correct'] ? 'list-group-item-success' : ''; ?>">
                        <?php echo htmlspecialchars($option['option_text']); ?>
                        <?php if ($option['is_correct']): ?>
                            <span class="float-end badge bg-success">Correct</span>
                        <?php endif; ?>
                    </li>
                <?php endforeach; ?>
            </ul>
        </div>
    <?php elseif ($question['question_type'] === 'short_answer' || $question['question_type'] === 'essay'): ?>
        <div class="mb-3">
            <h6 class="font-weight-bold">Correct Answer:</h6>
            <p><?php echo nl2br(htmlspecialchars($question['correct_answer'] ?? 'Not specified')); ?></p>
        </div>
    <?php endif; ?>
    
    <?php if (!empty($question['explanation'])): ?>
    <div class="mb-3">
        <h6 class="font-weight-bold">Explanation:</h6>
        <p><?php echo nl2br(htmlspecialchars($question['explanation'])); ?></p>
    </div>
    <?php endif; ?>
</div>