XYOracleNetwork/sdk-xyo-swift

//
//  XYCentralAgent.swift
//  XYBleSdk
//
//  Created by Darren Sutherland on 11/1/18.
//  Copyright © 2018 XY - The Findables Company. All rights reserved.
//

import CoreBluetooth
import Promises

// An agent that allows for adding connecting to the Central in an XYBluetoothDevice connection block
// or any other Promises chain
public final class XYCentralAgent: XYCentralDelegate {
  private let
  central = XYCentral.instance,
  delegateKey: String
  
  private lazy var promise = Promise<Void>.pending()
  
  public init() {
    self.delegateKey = "XYCentralAgent:\(UUID.init().uuidString)"
  }
  
  @discardableResult public func powerOn() -> Promise<Void> {
    guard self.central.state != .poweredOn else { return Promise(()) }
    
    self.central.setDelegate(self, key: self.delegateKey)
    self.central.enable()
    
    return promise.always(on: XYCentral.centralQueue) {
      self.central.removeDelegate(for: self.delegateKey)
    }
  }
  
  public func stateChanged(newState: CBManagerState) {
    newState == .poweredOn ?
      promise.fulfill(()) :
      promise.reject(XYBluetoothError.couldNotPowerOnCentral)
  }
  
  // Unused
  public func located(peripheral: XYPeripheral) {}
  public func discovered(beacon: XYIBeaconDefinition) {}
  public func connected(peripheral: XYPeripheral) {}
  public func timeout() {}
  public func couldNotConnect(peripheral: XYPeripheral) {}
  public func disconnected(periperhal: XYPeripheral) {}
}