<?php

namespace NoccyLabs\Shell;

use NoccyLabs\Shell\LineRead;

abstract class Shell
{
    public function __construct(array $config=[])
    {
        $this->configure($config);
    }

    abstract protected function configure(array $config);

    public function addCommand($command, callable $handler)
    {
        $this->commands[$command] = $handler;
    }

    public function execute($command)
    {
        $buffer = str_getcsv($command, " ", "\"", "\\");

        if (count($buffer)>0) {
            $this->executeBuffer($buffer);
        }
    }

    protected function executeBuffer(array $buffer)
    {
        $commandName = array_shift($buffer);
        if (array_key_exists($commandName, $this->commands)) {
            $command = $this->commands[$commandName];
            call_user_func_array($command,$buffer);
            return;
        }
        $this->writeln("Bad command: ".$commandName);
    }

    public function writeln($output)
    {
        echo "\r\e[K\e[0m".$output."\n";
    }
    
    protected function onUpdate()
    {
    }

    public function run(callable $updateFunc=null)
    {
        $lineRead = new LineRead();

        $this->running = true;
        
        
        
        do {
            $buffer = $lineRead->update();
            ob_start();
            if (is_callable($updateFunc)) {
                call_user_func($updateFunc);
            }
            $this->onUpdate();
            $buf = ob_get_contents();
            ob_end_clean();
            if ($buf) {
                $lineRead->erase();
                echo rtrim($buf)."\n";
                $lineRead->redraw();
            }
            //$buffer = readline($this->getPrompt());
            if ($buffer === null) {
                usleep(10000);
                continue;
            } else {
                $this->execute($buffer);
            }
        } while ($this->running);

    }

    public function stop()
    {
        $this->running = false;
    }
}