import Foundation
import Firebase
import RxSwift

class FireAuth {

  static let instance = FireAuth()
  private let auth: Auth

  init() {
    self.auth = Auth.auth()
  }

  public func register(_ params: [String:String]) -> Single<User> {
    return Single.create { callback in

      let email = params["email"] ?? ""
      let password = params["password"] ?? ""
      self.auth.createUser(withEmail: email, password: password) { (res, err) in
        if let user = res?.user { callback(.success(user)) }
        else if let err = err { callback(.error(ErrorPair.castOrCreate(err))) }
      }

      return Disposables.create()
    }
  }

  public func login(_ params: [String:String]) -> Single<User> {
    return Single.create { callback in

      let email = params["email"] ?? ""
      let password = params["password"] ?? ""
      self.auth.signIn(withEmail: email, password: password) { (res, err) in
        if let user = res?.user { callback(.success(user)) }
        else if let err = err { callback(.error(ErrorPair.castOrCreate(err))) }
      }

      return Disposables.create()
    }
  }

  public func logout() -> Completable {
    return Completable.create { callback in

      do { try self.auth.signOut(); callback(.completed) }
      catch let err { callback(.error(ErrorPair.castOrCreate(err))) }

      return Disposables.create()
    }

  }

}