website/test_language_logic.php

<?php
// Test language switching logic without redirects
session_start();
require_once 'includes/config.php';

echo "=== Testing Language Switching Logic ===\n\n";

// Test URL parsing logic directly
function testUrlParsing($testUrl) {
    echo "Testing URL: $testUrl\n";
    
    $parsedUrl = parse_url($testUrl);
    $redirectUrl = $parsedUrl['path'];
    
    if (isset($parsedUrl['query'])) {
        parse_str($parsedUrl['query'], $queryParams);
        unset($queryParams['lang']); // Remove lang parameter
        
        if (!empty($queryParams)) {
            $redirectUrl .= '?' . http_build_query($queryParams);
        }
    }
    
    echo "Parsed redirect URL: $redirectUrl\n\n";
    return $redirectUrl;
}

// Test various URL scenarios
$testUrls = [
    '/index.php?lang=fi&category=test',
    '/index.php?category=test&lang=fi',
    '/index.php?lang=fi',
    '/index.php?category=test&page=2',
    '/index.php'
];

foreach ($testUrls as $url) {
    testUrlParsing($url);
}

// Test session handling
echo "=== Testing Session Handling ===\n";

// Simulate language setting
$_SESSION['language'] = 'fi';
echo "Session language set to: " . $_SESSION['language'] . "\n";

// Test translation initialization
try {
    require_once 'includes/translation.php';
    
    // Clear GET to avoid redirect
    $_GET = array();
    
    $translation = Translation::getInstance();
    echo "Translation instance created successfully\n";
    echo "Current language: " . $translation->getCurrentLanguage() . "\n";
    echo "Supported languages: " . implode(', ', array_keys($translation->getSupportedLanguages())) . "\n";
    
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
}

echo "\n=== Language Switching Logic Test Complete ===\n";
?>