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<?php

namespace GeoJson;

use GeoJson\CoordinateReferenceSystem\CoordinateReferenceSystem;
use GeoJson\Exception\UnserializationException;

/**
 * Base GeoJson object.
 *
 * @see http://www.geojson.org/geojson-spec.html#geojson-objects
 * @since 1.0
 */
abstract class GeoJson implements \JsonSerializable, JsonUnserializable
{
    /**
     * @var BoundingBox
     */
    protected $boundingBox;

/**
     * @var CoordinateReferenceSystem
     */
    protected $crs;

/**
     * @var string
     */
    protected $type;

/**
     * Return the BoundingBox for this GeoJson object.
     *
     * @return BoundingBox
     */
    public function getBoundingBox()
    {
        return $this->boundingBox;
    }

/**
     * Return the CoordinateReferenceSystem for this GeoJson object.
     *
     * @return CoordinateReferenceSystem
     */
    public function getCrs()
    {
        return $this->crs;
    }

/**
     * Return the type for this GeoJson object.
     *
     * @return string
     */
    public function getType()
    {
        return $this->type;
    }

/**
     * @see http://php.net/manual/en/jsonserializable.jsonserialize.php
     */
    public function jsonSerialize()
    {
        $json = array('type' => $this->type);

if (isset($this->crs)) {
            $json['crs'] = $this->crs->jsonSerialize();
        }

if (isset($this->boundingBox)) {
            $json['bbox'] = $this->boundingBox->jsonSerialize();
        }

return $json;
    }

/**
     * @see JsonUnserializable::jsonUnserialize()
     */
    final public static function jsonUnserialize($json)
    {
        if ( ! is_array($json) && ! is_object($json)) {
            throw UnserializationException::invalidValue('GeoJson', $json, 'array or object');
        }

$json = new \ArrayObject($json);

if ( ! $json->offsetExists('type')) {
            throw UnserializationException::missingProperty('GeoJson', 'type', 'string');
        }

$type = (string) $json['type'];
        $args = array();

switch ($type) {
            case 'LineString':
            case 'MultiLineString':
            case 'MultiPoint':
            case 'MultiPolygon':
            case 'Point':
            case 'Polygon':
                if ( ! $json->offsetExists('coordinates')) {
                    throw UnserializationException::missingProperty($type, 'coordinates', 'array');
                }

if ( ! is_array($json['coordinates'])) {
                    throw UnserializationException::invalidProperty($type, 'coordinates', $json['coordinates'], 'array');
                }

$args[] = $json['coordinates'];
                break;

case 'Feature':
                $geometry = isset($json['geometry']) ? $json['geometry'] : null;
                $properties = isset($json['properties']) ? $json['properties'] : null;

if (isset($geometry) && ! is_array($geometry) && ! is_object($geometry)) {
                    throw UnserializationException::invalidProperty($type, 'geometry', $geometry, 'array or object');
                }

if (isset($properties) && ! is_array($properties) && ! is_object($properties)) {
                    throw UnserializationException::invalidProperty($type, 'properties', $properties, 'array or object');
                }

$args[] = isset($geometry) ? self::jsonUnserialize($geometry) : null;
                $args[] = isset($properties) ? (array) $properties : null;
                $args[] = isset($json['id']) ? $json['id'] : null;
                break;

case 'FeatureCollection':
                if ( ! $json->offsetExists('features')) {
                    throw UnserializationException::missingProperty($type, 'features', 'array');
                }

if ( ! is_array($json['features'])) {
                    throw UnserializationException::invalidProperty($type, 'features', $json['features'], 'array');
                }

$args[] = array_map(array('self', 'jsonUnserialize'), $json['features']);
                break;

case 'GeometryCollection':
                if ( ! $json->offsetExists('geometries')) {
                    throw UnserializationException::missingProperty($type, 'geometries', 'array');
                }

if ( ! is_array($json['geometries'])) {
                    throw UnserializationException::invalidProperty($type, 'geometries', $json['geometries'], 'array');
                }

$args[] = array_map(array('self', 'jsonUnserialize'), $json['geometries']);
                break;

default:
                throw UnserializationException::unsupportedType('GeoJson', $type);
        }

if (isset($json['bbox'])) {
            $args[] = BoundingBox::jsonUnserialize($json['bbox']);
        }

if (isset($json['crs'])) {
            $args[] = CoordinateReferenceSystem::jsonUnserialize($json['crs']);
        }

$class = sprintf('GeoJson\%s\%s', (strncmp('Feature', $type, 7) === 0 ? 'Feature' : 'Geometry'), $type);
        $class = new \ReflectionClass($class);

return $class->newInstanceArgs($args);
    }

/**
     * Set optional CRS and BoundingBox arguments passed to a constructor.
     *
     * @todo Decide if multiple CRS or BoundingBox instances should override a
     *       previous value or be ignored
     */
    protected function setOptionalConstructorArgs(array $args)
    {
        foreach ($args as $arg) {
            if ($arg instanceof CoordinateReferenceSystem) {
                $this->crs = $arg;
            }

if ($arg instanceof BoundingBox) {
                $this->boundingBox = $arg;
            }
        }
    }
}