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<?php
/**
 * SHIELD VERIFICATION ENDPOINT
 * 
 * Validates the challenge response and issues verification cookie
 */

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

require_once 'config/shield_config.php';
require_once 'includes/shield.php';

// If Shield is disabled, just pass
if (!shield_is_enabled()) {
    $return_url = $_SESSION['shield_challenge']['return_url'] ?? '/';
    echo json_encode(['success' => true, 'redirect' => $return_url]);
    exit;
}

// Only accept POST
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    http_response_code(405);
    echo json_encode(['success' => false, 'error' => 'Method not allowed']);
    exit;
}

// Parse JSON body
$input = json_decode(file_get_contents('php://input'), true);

if (!$input) {
    echo json_encode(['success' => false, 'error' => 'Invalid request']);
    exit;
}

$ip = $_SERVER['REMOTE_ADDR'] ?? 'unknown';

// Verify we have an active challenge
if (!isset($_SESSION['shield_challenge'])) {
    shield_log('verify_no_challenge', $ip, []);
    echo json_encode(['success' => false, 'error' => 'No active challenge']);
    exit;
}

$challenge = $_SESSION['shield_challenge'];

// Verify token matches
if ($input['token'] !== $challenge['token']) {
    shield_log('verify_token_mismatch', $ip, []);
    echo json_encode(['success' => false, 'error' => 'Invalid token']);
    exit;
}

// Verify challenge not expired
if (time() - $challenge['time'] > SHIELD_CHALLENGE_TIMEOUT) {
    shield_log('verify_expired', $ip, []);
    unset($_SESSION['shield_challenge']);
    echo json_encode(['success' => false, 'error' => 'Challenge expired']);
    exit;
}

// Verify puzzle answer
$expected_answer = $challenge['puzzle_answer'] ?? null;
$provided_answer = $input['answer'] ?? null;

if ($expected_answer === null || $provided_answer != $expected_answer) {
    shield_log('verify_wrong_answer', $ip, [
        'expected' => $expected_answer,
        'provided' => $provided_answer
    ]);
    echo json_encode(['success' => false, 'error' => 'Verification failed']);
    exit;
}

// Verify solve time
$solve_time = $input['solve_time'] ?? 0;
$puzzle_time = $challenge['puzzle_time'] ?? 0;

// Calculate actual time (client-reported)
if ($solve_time < SHIELD_MIN_SOLVE_TIME) {
    // Too fast - likely a bot
    shield_log('verify_too_fast', $ip, ['solve_time' => $solve_time]);
    echo json_encode(['success' => false, 'error' => 'Verification failed']);
    exit;
}

if ($solve_time > SHIELD_MAX_SOLVE_TIME) {
    // Too slow - might be automated
    shield_log('verify_too_slow', $ip, ['solve_time' => $solve_time]);
    echo json_encode(['success' => false, 'error' => 'Verification timeout']);
    exit;
}

// Check bot indicators
$bot_indicators = $input['bot_indicators'] ?? [];

if (!empty($bot_indicators)) {
    // Log but don't necessarily block - some legitimate browsers trip these
    shield_log('bot_indicators_detected', $ip, [
        'indicators' => $bot_indicators,
        'ua' => $_SERVER['HTTP_USER_AGENT'] ?? ''
    ]);
    
    // Block if webdriver or headless detected
    if (in_array('webdriver', $bot_indicators) || in_array('headless', $bot_indicators)) {
        echo json_encode(['success' => false, 'error' => 'Browser verification failed']);
        exit;
    }
}

// All checks passed - issue verification cookie
$fingerprint = $input['fingerprint'] ?? '';
shield_generate_cookie($ip, $fingerprint);

// Clear challenge session
$return_url = $challenge['return_url'] ?? '/';
unset($_SESSION['shield_challenge']);

// Log successful verification
shield_log('verified', $ip, [
    'solve_time' => $solve_time,
    'fingerprint_hash' => substr(hash('sha256', $fingerprint), 0, 16)
]);

echo json_encode([
    'success' => true,
    'redirect' => $return_url
]);