<?php
//
// Automatically login a single WordPress user upon arrival to main page.
//
function auto_login() {
    if (!is_user_logged_in()) {
        // Admin user_id
        $admins = get_users(array('role'=>'administrator'));
        $user_id = $admins[0]->ID;
        $user = get_user_by( 'ID', $user_id );
        if ( !$user ) {
            error_log("wp_auto_login: user_id==1 not found redirecting to admin_url");
            $redirect_page = admin_url();
            wp_redirect( $redirect_page );
            exit();
        }
        $loginusername = $user->user_login;
        wp_set_current_user($user_id, $loginusername);
        wp_set_auth_cookie($user_id);
        // Go to admin area
        $redirect_page = admin_url();
        error_log("wp_auto_login: trying to login user_id==1 loginusername=$loginusername to admin_url=$redirect_page");
        wp_redirect( $redirect_page );
        exit();
    }
}
// Initialize wordpress
define( 'WP_USE_THEMES', true );
// Delete itself to make sure it is executed only once
unlink(__FILE__);
if ( ! isset( $wp_did_header ) ) {
    $wp_did_header = true;
    // Load the WordPress library.
    require_once( dirname( __FILE__ ) . '/wp-load.php' );
    // If the user is already logged in just redirect it to admin area
    if ( is_user_logged_in() ) {
        $redirect_page = admin_url();
        wp_redirect( $redirect_page );
        exit();
    }
    auto_login();
    // Set up the WordPress query
    wp();
    // Load the theme template
    require_once( ABSPATH . WPINC . '/template-loader.php' );
}