import Foundation

if let bundleURL = NSBundle.mainBundle().URLForResource("Settings", withExtension: "bundle") {
    NSUserDefaults.registerDefaults(settingsBundleURL: bundleURL)
}

extension NSUserDefaults {
    static func registerDefaults(#settingsBundleURL: NSURL) {
        if let rootDict = NSDictionary(contentsOfURL: settingsBundleURL.URLByAppendingPathComponent("Root.plist")) {
            var defaults: NSUserDefaults?
            if let containerIdentifier = rootDict.valueForKey("ApplicationGroupContainerIdentifier") as? String {
                defaults = NSUserDefaults(suiteName: containerIdentifier)
            } else {
                defaults = NSUserDefaults.standardUserDefaults()
            }
            if let defaults = defaults, preferences = rootDict.valueForKey("PreferenceSpecifiers") as? [[String:AnyObject]] {
                var registrationDictionary: [NSObject:AnyObject] = [:]
                for prefs in preferences {
                    if let key = prefs["Key"] as? String, let value = p["DefaultValue"] {
                        registrationDictionary[key] = value
                    }
                }
                defaults.registerDefaults(registrationDictionary)
            }
        }
    }
}