<?php

class CmplzTestUrls extends WP_UnitTestCase {

    public function test_external_links() {
        // Set the base directory path where your plugin files are located
        $plugin_dir = dirname( __FILE__, 2 );

        // Define the regular expression pattern to match links
        $link_pattern = '/(?:(?<=\%s)|https:\/\/)[^\s\)%]+?(?=(?:\%s|[\'"]))/';

        // Set URLS and failed_urls
        $urls        = [];
        $failed_urls = [];

        // Use RecursiveIteratorIterator/RegexIterator classes to get all .php files in root + recursive plugin directories
        // This proved more reliable than using glob()
        $iterator  = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( $plugin_dir ) );
        $php_files = new RegexIterator( $iterator, '/^.+\.php$/i', RecursiveRegexIterator::GET_MATCH );

        // Now loop through these files. Exclude /vendor and /node_modules as we only want links from the plugin itself and not from dependencies
        foreach ( $php_files as $file ) {

            if (    strpos( $file[0], 'node_modules' ) !== false
                || strpos( $file[0], 'vendor' ) !== false
                || strpos( $file[0], 'burst-statistics' ) !== false
                || strpos( $file[0], 'really-simple-ssl' ) !== false
                || strpos( $file[0], 'vendor' ) !== false
                || strpos( $file[0], 'wp-admin' ) !== false
                || strpos( $file[0], 'wp-includes' ) !== false )
            {
                continue;
            }

            // Use the regular expression $link_pattern to match all links
            preg_match_all( $link_pattern, file_get_contents( $file[0] ), $matches );

            // Add each matched link to the URLs array
            foreach ( $matches[0] as $link ) {
                if ( strpos( $link, 'https://' ) === 0 ) {
                    // First remove excess HTML from links in PHP code using "><img src=" for example.
                    $link = strip_tags( $link );
                    // Then cut off the link after ? to exclude mtmcampaign etc.
                    $link = preg_replace( '/^([^?]+)\??.*$/', '$1', $link );
                    // Finally, replace all characters that should not be present in an URL, leaving only the following: forward /, word characters (\w), a period (.), a colon (:), a hyphen (-), or a hash symbol (#) with an empty string.
                    // This is done to strip artifacts from extracted URLS in PHP code, e.g. " ' < > \ etc.
                    $link   = trim( preg_replace( '/[^\/\w.:#\-]/', '', $link ) );
                    if ( filter_var($link, FILTER_VALIDATE_URL) ) {
                        $urls[] = $link;
                    }
                }
            }
        }

        // Remove duplicates
        $urls = array_unique( $urls );

        // Now filter the links to only include links from the following domains:
        // (scan.)really-simple-ssl.com, complianz.io, burst-statistics.com, really-simple-plugins.com, ziprecipes.net and wordpress.org
        $urls = array_filter( $urls, static function ( $url ) {
            return preg_match( '/^https?:\/\/(?:really-simple-ssl\.com|scan\.really-simple-ssl\.com|complianz\.io|really-simple-plugins\.com|ziprecipes\.net|wordpress\.org)/', $url );
        } );

        // Loop through each URL and make an HTTP request
        foreach ( $urls as $link ) {
            // Wait for a random amount of time (200-500ms) between requests to prevent hammering the servers
            usleep( rand( 200000, 500000 ) );
            // Now retrieve the webpage for a link
            $response = wp_remote_get( $link );

            // Add to failed URLs on WP error
            if ( is_wp_error( $response ) ) {
                $failed_urls[] = $link;
                error_log( "Failed to fetch URL: " . $link );
            } else {
                // Get status code
                $status_code = wp_remote_retrieve_response_code( $response );
                // Add to failed on 404
                if ( $status_code === 404 ) {
                    $failed_urls[] = $link;
                    error_log( "URL returned 404: " . $link );
                    error_log(print_r( $file , true ) );
                } else {
                    // This link works!
                }
            }
        }

        // Check if failed_urls is empty. Is it empty? Congratulations! Test passed!
        if ( empty( $failed_urls ) ) {
            $this->assertEmpty($failed_urls);
        } else {
            // Fail the test if any URLs did not pass our checks
            $this->fail( "Test Failed! Failed to fetch the following URLs:\n" . implode( "\n", $failed_urls ) );
        }
    }
}
