import Foundation

import GoogleSignIn

class GoogleLoginManager: NSObject, GIDSignInUIDelegate, GIDSignInDelegate {

    static let sharedInstance = GoogleLoginManager()
    private override init() {}

    var viewController: UIViewController?
    var completionHandler: ((_ user: UserModel?, _ error:String?) -> Void)?

    func signIn(controller:UIViewController, completion: @escaping (_ user: UserModel?, _ error:String?) -> Void) -> Void {

        self.viewController = controller
        self.completionHandler = completion

        GIDSignIn.sharedInstance().delegate = self
        GIDSignIn.sharedInstance().uiDelegate = self
        GIDSignIn.sharedInstance().signIn()
    }

    func logOutUser() -> Void {
        GIDSignIn.sharedInstance().signOut()
    }

    //MARK:Google SignIn Delegate

    func sign(inWillDispatch signIn: GIDSignIn!, error: Error!) {
    }

    func sign(_ signIn: GIDSignIn!,
              present viewController: UIViewController!) {

        self.viewController?.present(viewController, animated: true, completion: nil)
    }

    func sign(_ signIn: GIDSignIn!,
              dismiss viewController: UIViewController!) {
        self.viewController?.dismiss(animated: true, completion: nil)
    }

    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {

        if (error == nil) {

            var userProfile:[String:String] = [:]

            let idToken = user.authentication.idToken // Safe to send to the server

            userProfile[UserModel.Keys.firstName] = user.profile.name
            userProfile[UserModel.Keys.userId] = user.userID
            userProfile[UserModel.Keys.email] = user.profile.email
            userProfile[UserModel.Keys.userType] = "g"

            if user.profile.hasImage {

                let imageURL = user.profile.imageURL(withDimension: 100)

                if let string = imageURL {
                    userProfile[UserModel.Keys.picture] = string.absoluteString
                }
            }

            let userModel = UserModel(dictionary: userProfile)

            self.completionHandler!(userModel, nil)

        }
        else {
            print("error in sign in")
            self.completionHandler!(nil, error.localizedDescription)
        }
    }
}