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<?php

/*
 * This file is part of the JsonSchema package.
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace JsonSchema\Entity;

use JsonSchema\Exception\InvalidArgumentException;

/**
 * @package JsonSchema\Entity
 *
 * @author Joost Nijhuis <[email protected]>
 */
class JsonPointer
{
    /** @var string */
    private $filename;

    /** @var string[] */
    private $propertyPaths = array();

    /**
     * @var bool Whether the value at this path was set from a schema default
     */
    private $fromDefault = false;

    /**
     * @param string $value
     *
     * @throws InvalidArgumentException when $value is not a string
     */
    public function __construct($value)
    {
        if (!is_string($value)) {
            throw new InvalidArgumentException('Ref value must be a string');
        }

        $splitRef = explode('#', $value, 2);
        $this->filename = $splitRef[0];
        if (array_key_exists(1, $splitRef)) {
            $this->propertyPaths = $this->decodePropertyPaths($splitRef[1]);
        }
    }

    /**
     * @param string $propertyPathString
     *
     * @return string[]
     */
    private function decodePropertyPaths($propertyPathString)
    {
        $paths = array();
        foreach (explode('/', trim($propertyPathString, '/')) as $path) {
            $path = $this->decodePath($path);
            if (is_string($path) && '' !== $path) {
                $paths[] = $path;
            }
        }

        return $paths;
    }

    /**
     * @return array
     */
    private function encodePropertyPaths()
    {
        return array_map(
            array($this, 'encodePath'),
            $this->getPropertyPaths()
        );
    }

    /**
     * @param string $path
     *
     * @return string
     */
    private function decodePath($path)
    {
        return strtr($path, array('~1' => '/', '~0' => '~', '%25' => '%'));
    }

    /**
     * @param string $path
     *
     * @return string
     */
    private function encodePath($path)
    {
        return strtr($path, array('/' => '~1', '~' => '~0', '%' => '%25'));
    }

    /**
     * @return string
     */
    public function getFilename()
    {
        return $this->filename;
    }

    /**
     * @return string[]
     */
    public function getPropertyPaths()
    {
        return $this->propertyPaths;
    }

    /**
     * @param array $propertyPaths
     *
     * @return JsonPointer
     */
    public function withPropertyPaths(array $propertyPaths)
    {
        $new = clone $this;
        $new->propertyPaths = $propertyPaths;

        return $new;
    }

    /**
     * @return string
     */
    public function getPropertyPathAsString()
    {
        return rtrim('#/' . implode('/', $this->encodePropertyPaths()), '/');
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->getFilename() . $this->getPropertyPathAsString();
    }

    /**
     * Mark the value at this path as being set from a schema default
     */
    public function setFromDefault()
    {
        $this->fromDefault = true;
    }

    /**
     * Check whether the value at this path was set from a schema default
     *
     * @return bool
     */
    public function fromDefault()
    {
        return $this->fromDefault;
    }
}