/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 NSValueTransformer subclass for transforming MLMediaObject to it's CLLocation value.

 */

import Foundation

import MediaLibrary

class MediaObjectToLocationTransformer : ValueTransformer {

    func transformedValueClass() -> AnyClass {

        return CLLocation.self

    }

    func allowsReverseTransformation() -> Bool {

        return false

    }

    override func transformedValue(_ value: Any?) -> Any? {

        guard value != nil else { return nil }

        let mediaObject = value as! MLMediaObject

        // Convert the latitude/longitude values from the media object to a CLLocation object.

        var returnLocation : CLLocation?

        if let latitude = mediaObject.attributes["latitude"] {

            if let longitude = mediaObject.attributes["longitude"] {

                returnLocation = CLLocation(latitude: (latitude as! NSNumber).doubleValue, longitude: (longitude as! NSNumber).doubleValue)

            }

        }

        return returnLocation

    }

}