<?php

use WP_CLI\Utils;

class Shell_Command extends WP_CLI_Command {

    /**
     * Opens an interactive PHP console for running and testing PHP code.
     *
     * `wp shell` allows you to evaluate PHP statements and expressions
     * interactively, from within a WordPress environment. Type a bit of code,
     * hit enter, and see the code execute right before you. Because WordPress
     * is loaded, you have access to all the functions, classes and globals
     * that you can use within a WordPress plugin, for example.
     *
     * ## OPTIONS
     *
     * [--basic]
     * : Force the use of WP-CLI's built-in PHP REPL, even if the Boris or
     * PsySH PHP REPLs are available.
     *
     * ## EXAMPLES
     *
     *     # Call get_bloginfo() to get the name of the site.
     *     $ wp shell
     *     wp> get_bloginfo( 'name' );
     *     => string(6) "WP-CLI"
     */
    public function __invoke( $_, $assoc_args ) {
        $implementations = array(
            'Psy\\Shell',
            'Boris\\Boris',
            'WP_CLI\\Shell\\REPL',
        );

        if ( Utils\get_flag_value( $assoc_args, 'basic' ) ) {
            $class = 'WP_CLI\\Shell\\REPL';
        } else {
            foreach ( $implementations as $candidate ) {
                if ( class_exists( $candidate ) ) {
                    $class = $candidate;
                    break;
                }
            }
        }

        if ( 'Psy\\Shell' === $class ) {
            $shell = new Psy\Shell();
            $shell->run();
        } else {
            $repl = new $class( 'wp> ' );
            $repl->start();
        }
    }
}