<?php

/*
 * This file is part of the Access to Memory (AtoM) software.
 *
 * Access to Memory (AtoM) is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Access to Memory (AtoM) is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Access to Memory (AtoM).  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Simple representation of an asset.
 *
 * @author     David Juhasz <david@artefactual.com>
 */
class QubitAsset
{
    protected $name;
    protected $contents;
    protected $checksum;
    protected $checksumAlgorithm;
    protected $path;

    public function __construct()
    {
        $args = func_get_args();

        // File path passed
        if (1 == func_num_args()) {
            $path_parts = pathinfo($args[0]);

            $this->name = $path_parts['basename'];
            $this->path = $args[0];
        }
        // File name and contents passed
        elseif (2 == func_num_args()) {
            $this->name = $args[0];
            $this->contents = $args[1];
        }

        $this->generateChecksum('sha256');
    }

    public function setName($value)
    {
        $this->name = $value;

        return $this;
    }

    public function getName()
    {
        return $this->name;
    }

    public function getPath()
    {
        return $this->path;
    }

    public function setContents($value)
    {
        $this->contents = $value;

        return $this;
    }

    public function getContents()
    {
        return $this->contents;
    }

    public function setChecksum($value, $options)
    {
        if (isset($options['algorithm'])) {
            $this->setChecksumAlgorithm($options['algorithm']);
        }

        if (0 < strlen($value) && !isset($this->checksumAlgorithm)) {
            throw new Exception('You cannot set a checksum without specifiying an algorithm.');
        }

        $this->checksum = $value;

        return $this;
    }

    public function setChecksumAlgorithm($value)
    {
        $this->checksumAlgorithm = $value;

        return $this;
    }

    public function getChecksum()
    {
        return $this->checksum;
    }

    public function getChecksumAlgorithm()
    {
        return $this->checksumAlgorithm;
    }

    public function generateChecksum($algorithm)
    {
        if (!in_array($algorithm, hash_algos())) {
            throw new Exception('Invalid checksum algorithm');
        }

        $this->checksumAlgorithm = $algorithm;

        if (isset($this->contents)) {
            $this->checksum = hash($algorithm, $this->contents);
        } elseif (isset($this->path)) {
            $this->checksum = hash_file($algorithm, $this->path);
        }

        return $this->checksum;
    }
}
