<?php

namespace Kirby\Filesystem;

use Kirby\Cms\FileModifications;

/**
 * Anything in your public path can be converted
 * to an Asset object to use the same handy file
 * methods as for any other Kirby files. Pass a
 * relative path to the class to create the asset.
 *
 * @package   Kirby Filesystem
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier
 * @license   https://getkirby.com/license
 */
class Asset
{
    use IsFile;
    use FileModifications;

    /**
     * Relative file path
     *
     * @var string
     */
    protected $path;

    /**
     * Creates a new Asset object for the given path.
     *
     * @param string $path
     */
    public function __construct(string $path)
    {
        $this->setProperties([
            'path' => dirname($path),
            'root' => $this->kirby()->root('index') . '/' . $path,
            'url'  => $this->kirby()->url('index') . '/' . $path
        ]);
    }

    /**
     * Returns a unique id for the asset
     *
     * @return string
     */
    public function id(): string
    {
        return $this->root();
    }

    /**
     * Create a unique media hash
     *
     * @return string
     */
    public function mediaHash(): string
    {
        return crc32($this->filename()) . '-' . $this->modified();
    }

    /**
     * Returns the relative path starting at the media folder
     *
     * @return string
     */
    public function mediaPath(): string
    {
        return 'assets/' . $this->path() . '/' . $this->mediaHash() . '/' . $this->filename();
    }

    /**
     * Returns the absolute path to the file in the public media folder
     *
     * @return string
     */
    public function mediaRoot(): string
    {
        return $this->kirby()->root('media') . '/' . $this->mediaPath();
    }

    /**
     * Returns the absolute Url to the file in the public media folder
     *
     * @return string
     */
    public function mediaUrl(): string
    {
        return $this->kirby()->url('media') . '/' . $this->mediaPath();
    }

    /**
     * Returns the path of the file from the web root,
     * excluding the filename
     *
     * @return string
     */
    public function path(): string
    {
        return $this->path;
    }

    /**
     * Setter for the path
     *
     * @param string $path
     * @return $this
     */
    protected function setPath(string $path)
    {
        $this->path = $path === '.' ? '' : $path;
        return $this;
    }
}