<?php

namespace SilverStripe\Dev;

use SilverStripe\Control\Controller;
use SilverStripe\Control\Director;
use Exception;

/* Don't actually define these, since it'd clutter up the namespace.
define('1',E_ERROR);
define('2',E_WARNING);
define('4',E_PARSE);
define('8',E_NOTICE);
define('16',E_CORE_ERROR);
define('32',E_CORE_WARNING);
define('64',E_COMPILE_ERROR);
define('128',E_COMPILE_WARNING);
define('256',E_USER_ERROR);
define('512',E_USER_WARNING);
define('1024',E_USER_NOTICE);
define('2048',E_STRICT);
define('4096',E_RECOVERABLE_ERROR);
define('8192',E_DEPRECATED);
define('16384',E_USER_DEPRECATED);
define('30719',E_ALL);
*/
/**
 */
class SapphireREPL extends Controller
{

    private static $allowed_actions = [
        'index'
    ];

    public function error_handler($errno, $errstr, $errfile, $errline, $errctx)
    {
        // Ignore unless important error
        if (($errno & ~( 2048 | 8192 | 16384 )) == 0) {
            return ;
        }
        // Otherwise throw exception to handle in REPL loop
        throw new Exception(sprintf("%s:%d\r\n%s", $errfile, $errline, $errstr));
    }

    public function index()
    {
        if (!Director::is_cli()) {
            return "The SilverStripe Interactive Command-line doesn't work in a web browser."
                . " Use 'sake interactive' from the command-line to run.";
        }


        /* Try using PHP_Shell if it exists */
        @include 'php-shell-cmd.php' ;

        /* Fall back to our simpler interface */
        if (empty($__shell)) {
            set_error_handler([$this, 'error_handler']);

            echo "SilverStripe Interactive Command-line (REPL interface). Type help for hints.\n\n";
            while (true) {
                echo CLI::text("?> ", "cyan");
                echo CLI::start_colour("yellow");
                $command = trim(fgets(STDIN, 4096));
                echo CLI::end_colour();

                if ($command == 'help' || $command == '?') {
                    print "help or ? to exit\n" ;
                    print "quit or \q to exit\n" ;
                    print "install PHP_Shell for a more advanced interface with"
                        . " auto-completion and readline support\n\n" ;
                    continue ;
                }

                if ($command == 'quit' || $command == '\q') {
                    break ;
                }

                // Simple command processing
                if (substr($command, -1) == ';') {
                    $command = substr($command, 0, -1);
                }
                $is_print = preg_match('/^\s*print/i', $command);
                $is_return = preg_match('/^\s*return/i', $command);
                if (!$is_print && !$is_return) {
                    $command = "return ($command)";
                }
                $command .= ";";

                try {
                    $result = eval($command);
                    if (!$is_print) {
                        print_r($result);
                    }
                    echo "\n";
                } catch (Exception $__repl_exception) {
                    echo CLI::start_colour("red");
                    printf(
                        '%s (code: %d) got thrown' . PHP_EOL,
                        get_class($__repl_exception),
                        $__repl_exception->getCode()
                    );
                    print $__repl_exception;
                    echo "\n";
                }
            }
        }
    }
}