<?php

require_once __DIR__ . '/faceai_config.php';

$config = faceai_config();

try {
    $resultId = faceai_request_value('resultId');
    $token = faceai_request_value('token');

    if ($resultId === '' || $token === '') {
        faceai_render_message_page(
            'FaceAI return non disponibile',
            'Mancano resultId o token nella chiamata di ritorno da FaceAI.',
            array(),
            400
        );
    }

    $payload = faceai_verify_payload($token, $config['shared_secret']);
    if (($payload['type'] ?? '') !== 'return') {
        throw new RuntimeException('Wrong return token type.');
    }

    if ((string) ($payload['resultId'] ?? '') !== $resultId) {
        throw new RuntimeException('Result id mismatch.');
    }

    if ($config['return_forward_url'] !== '') {
        header('Location: ' . faceai_build_url($config['return_forward_url'], array(
            'resultId' => $resultId,
            'token' => $token
        )), true, 302);
        exit;
    }

    $bridgeUrl = faceai_build_url($config['backend_internal_url'] . '/bridge/results/' . rawurlencode($resultId), array(
        'token' => $token
    ));
    $result = faceai_fetch_json($bridgeUrl);
    $returnUrl = (string) ($result['returnUrl'] ?? '');
    $matches = is_array($result['matches'] ?? null) ? $result['matches'] : array();

    if ($returnUrl === '') {
        throw new RuntimeException('Missing legacy return URL.');
    }

    $photoIds = array();
    foreach ($matches as $match) {
        $photoId = trim((string) ($match['photoId'] ?? ($match['id'] ?? '')));
        if ($photoId === '') {
            continue;
        }
        $photoIds[$photoId] = true;
    }

    $matchCount = count($photoIds);
    if ($matchCount === 0) {
        header('Location: ' . faceai_build_url($returnUrl, array(
            'faceaiMatchSource' => 'faceai',
            'faceaiMatchCount' => 0
        )), true, 302);
        exit;
    }

    $storageKey = 'faceai-result-' . preg_replace('/[^a-zA-Z0-9_-]/', '', $resultId);
    $redirectUrl = faceai_build_url($returnUrl, array(
        'faceaiMatchSource' => 'faceai',
        'faceaiMatchCount' => $matchCount,
        'faceaiMatchStorageKey' => $storageKey
    ));

    faceai_render_storage_redirect_page($redirectUrl, $storageKey, array_keys($photoIds), $matchCount, (string) ($result['raceId'] ?? ($payload['raceId'] ?? '')));
} catch (Throwable $error) {
    faceai_render_message_page('Errore return FaceAI', $error->getMessage(), array(), 500);
}