<?php

// flush rewrite rules on plug-in activation or deactivation
register_activation_hook( ADDEFEND_PLUGIN_PHP_FILE, 'addefend_flush_rewrite_rules_act');
register_deactivation_hook( ADDEFEND_PLUGIN_PHP_FILE, 'addefend_flush_rewrite_rules_deact');
function addefend_flush_rewrite_rules_act() {
    flush_rewrite_rules();
}
function addefend_flush_rewrite_rules_deact() {
    global $deactivating;
    $deactivating = True;
    flush_rewrite_rules();
}

add_action('generate_rewrite_rules', "add_addefend_rewrite_rules");
function add_addefend_rewrite_rules() {
    global $wp_rewrite, $deactivating;
    // do not generate addefend rewrite rules when the plug-in is being deactivated
    if($deactivating){
        return;
    }
    $proxy_URL = get_option( 'addefend_proxy_URL' );
    addefend_log('ADDEFEND -- INFO : injecting '.$proxy_URL.' as the proxy URL');
    if(preg_match('/.*:\/\/.*\..*\/.*\/.*\/.*\/.*/', $proxy_URL)){
        $wp_rewrite->add_external_rule('^(.*)$', $proxy_URL.'/$1');
        add_filter('mod_rewrite_rules', "prepend_addefend_RewriteCond");
    }
}

// clean up the added rewrite rule and prepend RewriteConds
function prepend_addefend_RewriteCond( $rules ){
    $proxy_URL = get_option( 'addefend_proxy_URL' );
    $image_dir = get_option( 'addefend_image_dir', '/wp-content' );
    $pattern = "|RewriteRule \^\^\(\.\*\)\\$ /".$proxy_URL."/\\$1 \[QSA,L\]|";
    $replace="RewriteCond %{REQUEST_URI} ^".$image_dir."\r\nRewriteCond %{REQUEST_FILENAME} !-f\r\nRewriteRule ^(.*)\$ ".$proxy_URL."/\\$1 [P]";
    return preg_replace($pattern, $replace, $rules);
}