<?php
    if (isset($_GET['search'])) {
        $searchTerm = urlencode($_GET['search'] . " logo");

        $url = "https://www.google.com/search?q={$searchTerm}&tbm=isch";
        $backupUrl = "https://search.brave.com/search?q={$searchTerm}";

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

        // Convert all environment variable keys to lowercase
        $envVars = array_change_key_case($_SERVER, CASE_LOWER);

        // Check for http_proxy or https_proxy environment variables
        $httpProxy = isset($envVars['http_proxy']) ? $envVars['http_proxy'] : null;
        $httpsProxy = isset($envVars['https_proxy']) ? $envVars['https_proxy'] : null;

        if (!empty($httpProxy)) {
            curl_setopt($ch, CURLOPT_PROXY, $httpProxy);
        } elseif (!empty($httpsProxy)) {
            curl_setopt($ch, CURLOPT_PROXY, $httpsProxy);
        }

        $response = curl_exec($ch);

        if ($response === false) {
            // If cURL fails to access google images, use brave image search as a backup
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $backupUrl);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
            $envVars = array_change_key_case($_SERVER, CASE_LOWER);
            $httpProxy = isset($envVars['http_proxy']) ? $envVars['http_proxy'] : null;
            $httpsProxy = isset($envVars['https_proxy']) ? $envVars['https_proxy'] : null;
            if (!empty($httpProxy)) {
                curl_setopt($ch, CURLOPT_PROXY, $httpProxy);
            } elseif (!empty($httpsProxy)) {
                curl_setopt($ch, CURLOPT_PROXY, $httpsProxy);
            }
            $response = curl_exec($ch);
            if ($response === false) {
                echo json_encode(['error' => 'Failed to fetch data from Google.']);
            } else {
                $imageUrls = extractImageUrlsFromPage($response);
                header('Content-Type: application/json');
                echo json_encode(['imageUrls' => $imageUrls]);
            }
        } else {
            // Parse the HTML response to extract image URLs
            $imageUrls = extractImageUrlsFromPage($response);

            // Pass the image URLs to the client
            header('Content-Type: application/json');
            echo json_encode(['imageUrls' => $imageUrls]);
        }

        curl_close($ch);
    } else {
        echo json_encode(['error' => 'Invalid request.']);
    }

    function extractImageUrlsFromPage($html) {
        $imageUrls = [];

        $doc = new DOMDocument();
        @$doc->loadHTML($html);

        $imgTags = $doc->getElementsByTagName('img');
        foreach ($imgTags as $imgTag) {
            $src = $imgTag->getAttribute('src');
            if (!strstr($imgTag->getAttribute('class'), "favicon") && !strstr($imgTag->getAttribute('class'), "logo")) {
                if (filter_var($src, FILTER_VALIDATE_URL)) {
                    $imageUrls[] = $src;
                }
            }
        }

        return $imageUrls;
    }
    
?>