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monix
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package io.taig.android

import java.io.IOException

import android.os.Bundle
import com.google.android.gms
import com.google.android.gms.common.ConnectionResult
import com.google.android.gms.common.api.GoogleApiClient.{
  ConnectionCallbacks,
  OnConnectionFailedListener
}
import io.taig.android.log.Log
import io.taig.android.monix.GoogleApiClient.Event.{Connected, Suspended}
import _root_.monix.execution.Ack.Stop
import _root_.monix.execution.Cancelable
import _root_.monix.reactive.observers.Subscriber

package object monix {
  type GoogleApiClient = com.google.android.gms.common.api.GoogleApiClient

  object GoogleApiClient {
    type Builder = com.google.android.gms.common.api.GoogleApiClient.Builder

    sealed trait Event {
      def client: GoogleApiClient
    }

    object Event {
      def unapply(event: Event): Option[GoogleApiClient] = {
        Some(event.client)
      }

      final case class Connected(
          client: GoogleApiClient,
          bundle: Bundle
      ) extends Event

      final case class Suspended(
          client: GoogleApiClient,
          cause: Int
      ) extends Event
    }

    def disconnect(client: GoogleApiClient)(
        implicit
        t: Log.Tag
    ): Unit =
      if (client.isConnecting || client.isConnected) {
        Log.d("Disconnecting from GoogleApiClient")
        client.disconnect()
      }

    def apply(
        client: gms.common.api.GoogleApiClient,
        subscriber: Subscriber.Sync[Event]
    )(
        implicit
        t: Log.Tag
    ): Cancelable = {
      client.registerConnectionCallbacks {
        new ConnectionCallbacks {
          override def onConnected(bundle: Bundle): Unit = {
            Log.d("Connection to GoogleApiClient established")

            val event = Connected(client, bundle)
            if (subscriber.onNext(event) == Stop) {
              disconnect(client)
            }
          }

          override def onConnectionSuspended(cause: Int): Unit = {
            Log.d("Connection to GoogleApiClient suspended")

            val event = Suspended(client, cause)
            if (subscriber.onNext(event) == Stop) {
              disconnect(client)
            }
          }
        }
      }

      client.registerConnectionFailedListener {
        new OnConnectionFailedListener {
          override def onConnectionFailed(result: ConnectionResult) = {
            val message = result.getErrorMessage +
              s" (${result.getErrorCode})"
            val exception = new IOException(message)

            Log.d(
              "Connection to GoogleApiClient failed",
              exception
            )

            subscriber.onError(exception)
          }
        }
      }

      Log.d("Connecting to GoogleApiClient")

      client.connect()

      Cancelable { () ⇒
        disconnect(client)
      }
    }
  }
}