<?php

/**
 * @package   Gantry5
 * @author    RocketTheme http://www.rockettheme.com
 * @copyright Copyright (C) 2007 - 2015 RocketTheme, LLC
 * @license   Dual License: MIT or GNU/GPLv2 and later
 *
 * http://opensource.org/licenses/MIT
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * Gantry Framework code that extends GPL code is considered GNU/GPLv2 and later
 */

namespace Gantry\Component\File;

use RocketTheme\Toolbox\File\PhpFile;

/**
 * Class CompiledFile
 * @package Grav\Common\File
 *
 * @property string $filename
 * @property string $extension
 * @property string $raw
 * @property array|string $content
 */
trait CompiledFile
{
    protected $cachePath;

    /**
     * @param string $path
     * @return $this
     */
    public function setCachePath($path)
    {
        $this->cachePath = $path;

        return $this;
    }

    /**
     * Get/set parsed file contents.
     *
     * @param mixed $var
     * @return string
     * @throws \BadMethodCallException
     */
    public function content($var = null)
    {
        if (!$this->cachePath) {
            throw new \BadMethodCallException("Cache path not defined for compiled file ({$this->filename})!");
        }

        // If nothing has been loaded, attempt to get pre-compiled version of the file first.
        if ($var === null && $this->raw === null && $this->content === null) {
            $key = md5($this->filename);
            $file = PhpFile::instance($this->cachePath . "/{$key}{$this->extension}.php");
            $modified = $this->modified();

            if (!$modified) {
                return $this->decode($this->raw());
            }

            $class = get_class($this);

            $cache = $file->exists() ? $file->content() : null;

            // Load real file if cache isn't up to date (or is invalid).
            if (
                !isset($cache['@class'])
                || $cache['@class'] != $class
                || $cache['modified'] != $modified
                || $cache['filename'] != $this->filename
            ) {
                // Attempt to lock the file for writing.
                try {
                    $file->lock(false);
                } catch (\Exception $e) {
                    // Another process has locked the file; we will check this in a bit.
                }

                // Decode RAW file into compiled array.
                $data = $this->decode($this->raw());
                $cache = [
                    '@class' => $class,
                    'filename' => $this->filename,
                    'modified' => $modified,
                    'data' => $data
                ];

                // If compiled file wasn't already locked by another process, save it.
                if ($file->locked() !== false) {
                    $file->save($cache);
                    $file->unlock();
                }
            }

            $this->content = $cache['data'];
        }

        return parent::content($var);
    }
}
