<?php
/***************************************************************
 * Generate random selector or file name
 ***************************************************************/
function an_random_slug() {
    $alphabet = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789";
    $prefix = array();
    $alphaLength = strlen($alphabet) - 1;
    for ($i = 0; $i < 12; $i++) {
        $n = rand(0, $alphaLength);
        $prefix[] = $alphabet[$n];
    }
    return implode($prefix);
}


/***************************************************************
 * Create new Style and Script files in a temp directory
 ***************************************************************/
function an_change_files_css_selectors($flush, $tempFolderPath, $tempFolderURL, $file, $oldFileName, $newFileName, $oldSelectors, $newSelectors, $content = '') {

    //Get default css and js files
    $fileExt = pathinfo($file, PATHINFO_EXTENSION);
    $fileResponse = wp_remote_get($file);
    $fileContent = wp_remote_retrieve_body($fileResponse) . $content;

    
    //Flush semectors
    if ( $flush == true ) {
        //Replace default selectors with new ones
        $defaultSelectors = array('an-Modal', 'reveal-modal', 'an-alternative');
        $fileContent = str_replace($defaultSelectors, $newSelectors, $fileContent);
    } else {
        //Replace default selectors with existings ones
        $defaultSelectors = array('an-Modal', 'reveal-modal', 'an-alternative');
        $fileContent = str_replace($defaultSelectors, $oldSelectors, $fileContent);
      
    }
    
    //Load WP_Filesystem API
    WP_Filesystem();
    global $wp_filesystem;

    //Verify that we can create the file
    if ($wp_filesystem->exists($tempFolderPath . $oldFileName)) {
        if (!$wp_filesystem->is_writable($tempFolderPath . $oldFileName) ||
            !$wp_filesystem->is_readable($tempFolderPath . $oldFileName)) {
            return false;
        }
    }
    //Verify directory
    $uploadDir = wp_upload_dir();
    if (!$wp_filesystem->is_dir($uploadDir['basedir']) ||
        !$wp_filesystem->is_writable($uploadDir['basedir'])) {
        return false;
    }

    //Create new dir and files
    if ($wp_filesystem->is_dir($tempFolderPath)) {
        array_map('unlink', glob($tempFolderPath . '*.' . $fileExt));
    } else {
        $wp_filesystem->mkdir($tempFolderPath);
    }
    
    //Create new file (flush) or update old one
    if ( $flush == true ) {
        $wp_filesystem->put_contents($tempFolderPath . $newFileName . '.' . $fileExt, $fileContent, 0644);
        return $newFileName . '.' . $fileExt;       
    } else {       
        $wp_filesystem->put_contents($tempFolderPath . $oldFileName, $fileContent, 0644);
        return $oldFileName;        
    }

}


/***************************************************************
 * Save scripts and styles with new random selectors after saving Titan Options
 ***************************************************************/
function an_save_setting_random_selectors() {
    
    $an_option = unserialize(get_option('adblocker_notify_options'));
  
    //Define new temp path
    $uploadDir = wp_upload_dir();
    $tempFolderPath = trailingslashit($uploadDir['basedir']) . 'an-temp/';
    $tempFolderURL = trailingslashit($uploadDir['baseurl']) . 'an-temp/';

    if( $an_option['an_option_selectors'] == true ) {
        
        //Retrieve old files infos
        $anScripts = unserialize(get_option('adblocker_notify_selectors'));
        if( !isset( $anScripts['files']['css'] ) ) $anScripts['files']['css'] = '';
        if( !isset( $anScripts['files']['js'] ) ) $anScripts['files']['js'] = '';
        if( !isset( $anScripts['selectors'] ) ) $anScripts['selectors'] = '';

        //Define new selectors
        $newSelectors = array(an_random_slug(), an_random_slug(), an_random_slug());
    
        $flush = false;
        if( $an_option['an_option_flush'] == true || !file_exists($tempFolderPath) ) $flush = true;

        //Generate new css and js files
        $titanCssContent = an_update_titan_css_selectors();
        $newCSS = an_change_files_css_selectors(
                    $flush,
                    $tempFolderPath, 
                    $tempFolderURL,
                    AN_URL . 'css/an-style.min.css',
                    $anScripts['files']['css'],
                    an_random_slug(),
                    $anScripts['selectors'],
                    $newSelectors,
                    $titanCssContent
                );
        $newJS = an_change_files_css_selectors(
                    $flush,
                    $tempFolderPath, 
                    $tempFolderURL,
                    AN_URL . 'js/an-scripts.min.js',
                    $anScripts['files']['js'],
                    an_random_slug(),
                    $anScripts['selectors'],
                    $newSelectors
                );

        //Upload dir and temp dir are not writable
        if ( $newCSS == false || $newJS == false ) {
            $tempFolderPath = false;
        }
        
        //Keep old selectors if no flushed
        if ( $flush == false ) {
            $newSelectors = $anScripts['selectors'];
        }
    
        //Store data
        $newFiles = array(
            'temp-path' => $tempFolderPath,
            'temp-url' => $tempFolderURL,
            'files' => array(
                'css' => $newCSS,
                'js' => $newJS
            ),
            'selectors' => $newSelectors
        );

        update_option('adblocker_notify_selectors', serialize($newFiles));      

        //remove option flush
        $an_option['an_option_flush'] = false;
        update_option('adblocker_notify_options', serialize($an_option));   
        
    } else {

        // Remove temp files
        an_delete_temp_folder($tempFolderPath);
   
    }
}
add_action('tf_admin_options_saved_adblocker_notify', 'an_save_setting_random_selectors', 99);


/***************************************************************
 * Admin Panel notice if wrong CHMOD on "wp-content/uploads"
 ***************************************************************/
function an_error_admin_notices() {
    $screen = get_current_screen();
    if ($screen->id != 'toplevel_page_' . AN_ID)
        return;

    $anScripts = unserialize(get_option('adblocker_notify_selectors'));

    if (!empty($anScripts) && $anScripts['temp-path'] == false) {
        echo '
                <div class="error warning">
                    <p>
                        ' . __('WARNING: There was an error creating Adblock Notify CSS and JS files. Upload directory is not writable. Please CHMOD "wp-content/uploads" to 0664 and verify your server settings', 'an-translate') . ' &nbsp;&nbsp;&nbsp;&nbsp;
                        [ <a href="http://codex.wordpress.org/Changing_File_Permissions" target="_blank" title="Changing File Permissions"> Changing File Permissions</a> ]
                    </p>
                    <p>
                        ' . __('Don\'t worry, we thought about it. Adblock Notify will print the scripts directly in your DOM, but for performance purpose it is recommended to change your uploads directory CHMOD.', 'an-translate') . '
                    </p>
                </div>
        ';
    }
}
add_action('admin_notices', 'an_error_admin_notices');


/***************************************************************
 * Edit Titan Generated CSS
 ***************************************************************/
function an_update_titan_css_selectors() {

    //Get TitanFramework style
    $an_option = TitanFramework::getInstance('adblocker_notify');
   
    $tfStyle = '';
    $tfStyle .= $an_option->getOption('an_alternative_custom_css');
    $tfStyle .= $an_option->getOption('an_option_modal_custom_css');

    //Remove TitanFramework Generated Style
    $uploadDir = wp_upload_dir();
    
    unlink(trailingslashit($uploadDir['basedir']) . 'titan-framework-adblocker_notify-css.css');

    return $tfStyle;
}


/***************************************************************
 * Print Style & Sripts if temp dir. is not writable LOW PERF
 ***************************************************************/
function an_print_change_files_css_selectors($an_option, $anScripts) {

    //Get AN style and script
    $anCSS = AN_URL . 'css/an-style.min.css';
    $anJS = AN_URL . 'js/an-scripts.min.js';

    $newSelectors = $anScripts['selectors'];
    $defaultSelectors = array('an-Modal', 'reveal-modal', 'an-alternative');

    $tfStyle = '';
    $tfStyle .= $an_option->getOption('an_alternative_custom_css');
    $tfStyle .= $an_option->getOption('an_option_modal_custom_css');
   
    $anCSSFileContent = wp_remote_get($anCSS);
    $anCSSFileContent = wp_remote_retrieve_body($anCSSFileContent);
    $anCSSFileContent = str_replace($defaultSelectors, $newSelectors, $anCSSFileContent . $tfStyle);

    $anJSFileContent = wp_remote_get($anJS);
    $anJSFileContent = wp_remote_retrieve_body($anJSFileContent);
    $anJSFileContent = str_replace($defaultSelectors, $newSelectors, $anJSFileContent);

    return '	
            <style type="text/css">
                ' . $anCSSFileContent . '
            </style>
            <script type="text/javascript">
                ' . $anJSFileContent . '
            </script>
         ';
}