<?php
require_once 'includes/config.php';
require_once 'includes/auth.php';
require_once 'includes/db.php';
require_once 'includes/survey_functions.php';

header('Content-Type: application/json');

try {
    $auth = new Auth();
    if (!$auth->isLoggedIn()) {
        throw new Exception('Unauthorized');
    }

    $surveyId = isset($_GET['survey_id']) ? (int)$_GET['survey_id'] : null;
    $questionId = isset($_GET['question_id']) ? (int)$_GET['question_id'] : null;
    
    if (!$surveyId) {
        throw new Exception('Survey ID is required');
    }

    $db = Database::getInstance();
    
    // Check if survey exists and user has access
    $stmt = $db->prepare("SELECT * FROM surveys WHERE id = ? AND created_by = ?");
    $stmt->bind_param('ii', $surveyId, $_SESSION['user_id']);
    $stmt->execute();
    $survey = $stmt->get_result()->fetch_assoc();
    
    if (!$survey) {
        throw new Exception('Survey not found or access denied');
    }

    // Get questions
    if ($questionId) {
        // Get specific question
        $stmt = $db->prepare("SELECT * FROM survey_questions WHERE id = ? AND survey_id = ?");
        $stmt->bind_param('ii', $questionId, $surveyId);
        $stmt->execute();
        $question = $stmt->get_result()->fetch_assoc();
        
        if (!$question) {
            throw new Exception('Question not found');
        }
        
        // Parse JSON fields
        if (!empty($question['options'])) {
            $question['options'] = json_decode($question['options'], true);
        }
        
        if (!empty($question['config'])) {
            $question['config'] = json_decode($question['config'], true);
        }
        
        echo json_encode([
            'success' => true,
            'question' => $question
        ]);
    } else {
        // Get all questions
        $stmt = $db->prepare("SELECT * FROM survey_questions WHERE survey_id = ? ORDER BY question_order ASC");
        $stmt->bind_param('i', $surveyId);
        $stmt->execute();
        $result = $stmt->get_result();
        
        $questions = [];
        while ($question = $result->fetch_assoc()) {
            // Parse JSON fields
            if (!empty($question['options'])) {
                $question['options'] = json_decode($question['options'], true);
            }
            
            if (!empty($question['config'])) {
                $question['config'] = json_decode($question['config'], true);
            }
            
            $questions[] = $question;
        }
        
        echo json_encode([
            'success' => true,
            'questions' => $questions
        ]);
    }
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}
?>