<?php

namespace VfxApply\Plugin\Executor;

use VfxApply\Plugin;
use VfxApply\Input;
use VfxApply\Output;
use VfxApply\Preset;

class Script
{
    /** @var array Variables */
    protected $vars = [];

    protected $plugin;

    public function setPlugin($plugin)
    {
        $this->plugin = $plugin;
    }

    public function set($k,$v)
    {
        $this->vars[$k] = $v;
    }

    public function addOperation(Operation $operation)
    {
        $operation->setScript($this);
        $this->operations[] = $operation;
    }

    public function addHelper($name, Helper $helper)
    {
        $helper->setScript($this);
        $this->helpers[$name] = $helper;
    }

    public function getHelper($name)
    {
        return $this->helpers[$name];
    }

    public function execute(array $env)
    {
        $env = $this->buildEnvironment($env, $this->vars);
        //print_r($env);
        foreach ($this->operations as $operation) {
            //printf("Executing: %s\n", $operation->getInfo());
            $dialog = $this->plugin->createDialog(DIALOG_PROGRESS, $operation->getInfo());
            $dialog->show();
            $operation->execute($env, $dialog);
            unset($dialog);
        }
    }

    private function buildEnvironment(array $env, array $vars)
    {
        $vars = array_merge($env, $vars);
        foreach ($vars as $k=>$var) {
            if (is_array($var)) {
                $esc = empty($var['escape'])?false:$var['escape'];
                $var = preg_replace_callback('/\{\%([a-z]+?)\}/i', function ($match) use (&$vars,$var) {
                    $k = $match[1];
                    if (empty($vars[$k])) return null;
                    return $vars[$k];
                }, $var['value']);
                if ($esc) $var = escapeshellarg($var);
                $vars[$k] = $var;
            }
        }
        return $vars;
    }

    public function parseVariable($value, array $env)
    {
        return preg_replace_callback('/\{\%([a-z]+?)\}/i', function ($match) use (&$env) {
            $k = $match[1];
            if (empty($env[$k])) return null;
            return $env[$k];
        }, $value);
    }
}