import messaging from '@react-native-firebase/messaging';
import { Platform } from 'react-native';
import RNCallKeep, { IOptions } from 'react-native-callkeep';
import {
  ConnectParams,
  EventType,
  TwilioPhone,
  twilioPhoneEmitter,
} from 'react-native-twilio-phone';
import VoipPushNotification from 'react-native-voip-push-notification';
import ramdomUuid from 'uuid-random';

export type RNTwilioPhoneOptions = {
  requestPermissionsOnInit: boolean; // Default: true
};

type Call = {
  uuid: string | null;
  sid: string | null;
  payload: object | null;
};

const defaultOptions: RNTwilioPhoneOptions = {
  requestPermissionsOnInit: true,
};

const CK_CONSTANTS = {
  END_CALL_REASONS: {
    FAILED: 1,
    REMOTE_ENDED: 2,
    UNANSWERED: 3,
    ANSWERED_ELSEWHERE: 4,
    DECLINED_ELSEWHERE: 5,
    MISSED: 6,
  },
};

class RNTwilioPhone {
  static calls: Call[] = [];

  private static fetchAccessToken: () => Promise<string>;
  private static deviceToken: string | null = null;
  private static activeCall: Call | null = null;

  static initialize(
    callKeepOptions: IOptions,
    fetchAccessToken: () => Promise<string>,
    options = defaultOptions
  ) {
    const unsubscribeCallKeep = RNTwilioPhone.initializeCallKeep(
      callKeepOptions,
      fetchAccessToken,
      options
    );

    const unsubscribeRegisterAndroid = RNTwilioPhone.registerAndroid();
    const unsubscribeRegisterIOS = RNTwilioPhone.registerIOS();

    return () => {
      unsubscribeCallKeep();
      unsubscribeRegisterAndroid();
      unsubscribeRegisterIOS();
    };
  }

  static initializeCallKeep(
    callKeepOptions: IOptions,
    fetchAccessToken: () => Promise<string>,
    options = defaultOptions
  ) {
    const { requestPermissionsOnInit } = options;

    RNTwilioPhone.fetchAccessToken = fetchAccessToken;

    if (Platform.OS === 'ios' || requestPermissionsOnInit) {
      RNCallKeep.setup(callKeepOptions)
        .then(() => {
          RNCallKeep.setAvailable(true);
        })
        .catch((e) => console.log(e));
    } else {
      RNCallKeep.registerPhoneAccount(callKeepOptions);
      RNCallKeep.registerAndroidEvents();
      RNCallKeep.setAvailable(true);
    }

    const unsubscribeTwilioPhone = RNTwilioPhone.listenTwilioPhone();
    const unsubscribeCallKeep = RNTwilioPhone.listenCallKeep();

    return () => {
      unsubscribeTwilioPhone();
      unsubscribeCallKeep();
    };
  }

  static handleBackgroundState(callKeepOptions: IOptions) {
    if (Platform.OS !== 'android') {
      return;
    }

    messaging().setBackgroundMessageHandler(async (remoteMessage) => {
      if (!remoteMessage.data) {
        return;
      }

      RNCallKeep.registerPhoneAccount(callKeepOptions);
      RNCallKeep.registerAndroidEvents();
      RNCallKeep.setAvailable(true);

      RNTwilioPhone.listenTwilioPhone();
      RNTwilioPhone.listenCallKeep();

      TwilioPhone.handleMessage(remoteMessage.data);
    });
  }

  static async startCall(
    to: string,
    calleeName?: string,
    from?: string,
    additionalParams: ConnectParams = {}
  ) {
    const accessToken = await RNTwilioPhone.fetchAccessToken();
    const params: ConnectParams = { to };

    if (from) {
      params.from = from;
    }

    TwilioPhone.startCall(accessToken, {
      ...params,
      ...additionalParams,
    });

    const uuid = ramdomUuid().toLowerCase();
    RNTwilioPhone.activeCall = { uuid: null, sid: null, payload: null };

    RNCallKeep.startCall(uuid, to, calleeName, 'generic');
  }

  static async unregister() {
    if (!RNTwilioPhone.deviceToken) {
      return;
    }

    const accessToken = await RNTwilioPhone.fetchAccessToken();
    TwilioPhone.unregister(accessToken, RNTwilioPhone.deviceToken);
  }

  private static registerAndroid() {
    if (Platform.OS !== 'android') {
      return () => {};
    }

    messaging()
      .getToken()
      .then(RNTwilioPhone.registerTwilioPhone)
      .catch((e) => console.log(e));

    // Listen to whether the token changes
    const unsubscribeTokenRefresh = messaging().onTokenRefresh(
      RNTwilioPhone.registerTwilioPhone
    );

    const unsubscribeMessage = messaging().onMessage((remoteMessage) => {
      if (remoteMessage.data) {
        TwilioPhone.handleMessage(remoteMessage.data);
      }
    });

    return () => {
      unsubscribeTokenRefresh();
      unsubscribeMessage();
    };
  }

  private static registerIOS() {
    if (Platform.OS !== 'ios') {
      return () => {};
    }

    VoipPushNotification.addEventListener(
      'register',
      RNTwilioPhone.registerTwilioPhone
    );

    VoipPushNotification.addEventListener(
      'notification',
      (notification: any) => {
        delete notification.aps;
        TwilioPhone.handleMessage(notification);
      }
    );

    VoipPushNotification.registerVoipToken();

    return () => {
      VoipPushNotification.removeEventListener('register');
      VoipPushNotification.removeEventListener('notification');
    };
  }

  private static listenTwilioPhone() {
    RNTwilioPhone.removeTwilioPhoneListeners();

    const subscriptions = [
      twilioPhoneEmitter.addListener(
        EventType.CallInvite,
        ({ callSid, from }) => {
          // Incoming call is already reported to CallKit on iOS
          if (Platform.OS === 'android') {
            const uuid = ramdomUuid().toLowerCase();
            RNTwilioPhone.addCall({ uuid, sid: callSid, payload: null });

            RNCallKeep.displayIncomingCall(uuid, from);
          }
        }
      ),
      twilioPhoneEmitter.addListener(
        EventType.CancelledCallInvite,
        ({ callSid }) => {
          const uuid = RNTwilioPhone.getCallUUID(callSid);

          if (uuid) {
            RNCallKeep.reportEndCallWithUUID(
              uuid,
              CK_CONSTANTS.END_CALL_REASONS.MISSED
            );

            RNTwilioPhone.removeCall(uuid);
          }
        }
      ),
      twilioPhoneEmitter.addListener(EventType.CallRinging, ({ callSid }) => {
        if (RNTwilioPhone.activeCall) {
          RNTwilioPhone.activeCall.sid = callSid;

          if (RNTwilioPhone.activeCall.uuid) {
            RNTwilioPhone.addCall(RNTwilioPhone.activeCall);
            RNTwilioPhone.activeCall = null;
          }
        }
      }),
      twilioPhoneEmitter.addListener(EventType.CallConnected, ({ callSid }) => {
        const uuid = RNTwilioPhone.getCallUUID(callSid);

        uuid && RNCallKeep.setCurrentCallActive(uuid);
      }),
      twilioPhoneEmitter.addListener(
        EventType.CallDisconnected,
        ({ callSid }) => {
          const uuid = RNTwilioPhone.getCallUUID(callSid);

          if (uuid) {
            RNCallKeep.reportEndCallWithUUID(
              uuid,
              CK_CONSTANTS.END_CALL_REASONS.REMOTE_ENDED
            );

            RNTwilioPhone.removeCall(uuid);
          }
        }
      ),
      twilioPhoneEmitter.addListener(
        EventType.CallDisconnectedError,
        ({ callSid }) => {
          const uuid = RNTwilioPhone.getCallUUID(callSid);

          if (uuid) {
            RNCallKeep.reportEndCallWithUUID(
              uuid,
              CK_CONSTANTS.END_CALL_REASONS.FAILED
            );

            RNTwilioPhone.removeCall(uuid);
          }
        }
      ),
    ];

    return () => {
      subscriptions.map((subscription) => {
        subscription.remove();
      });
    };
  }

  private static listenCallKeep() {
    RNTwilioPhone.removeCallKeepListeners();

    if (Platform.OS === 'ios') {
      RNCallKeep.addEventListener(
        'didDisplayIncomingCall',
        ({ callUUID, payload }) => {
          delete payload.aps;

          RNTwilioPhone.addCall({
            uuid: callUUID,
            sid: payload.twi_call_sid,
            payload,
          });
        }
      );

      RNCallKeep.addEventListener('didResetProvider', () => {
        TwilioPhone.deactivateAudio();
      });

      RNCallKeep.addEventListener('didActivateAudioSession', () => {
        TwilioPhone.activateAudio();
      });

      RNCallKeep.addEventListener('didDeactivateAudioSession', () => {
        TwilioPhone.deactivateAudio();
      });
    }

    RNCallKeep.addEventListener('didReceiveStartCallAction', ({ callUUID }) => {
      if (RNTwilioPhone.activeCall) {
        RNTwilioPhone.activeCall.uuid = callUUID;

        if (RNTwilioPhone.activeCall.sid) {
          RNTwilioPhone.addCall(RNTwilioPhone.activeCall);
          RNTwilioPhone.activeCall = null;
        }
      }
    });

    RNCallKeep.addEventListener('answerCall', ({ callUUID }) => {
      const sid = RNTwilioPhone.getCallSid(callUUID);

      sid && TwilioPhone.acceptCallInvite(sid);
    });

    RNCallKeep.addEventListener('endCall', ({ callUUID }) => {
      const sid = RNTwilioPhone.getCallSid(callUUID);

      sid && TwilioPhone.endCall(sid);

      RNTwilioPhone.removeCall(callUUID);
    });

    RNCallKeep.addEventListener(
      'didPerformSetMutedCallAction',
      ({ callUUID, muted }) => {
        const sid = RNTwilioPhone.getCallSid(callUUID);

        sid && TwilioPhone.toggleMuteCall(sid, muted);
      }
    );

    RNCallKeep.addEventListener(
      'didToggleHoldCallAction',
      ({ callUUID, hold }) => {
        const sid = RNTwilioPhone.getCallSid(callUUID);

        sid && TwilioPhone.toggleHoldCall(sid, hold);
      }
    );

    RNCallKeep.addEventListener(
      'didPerformDTMFAction',
      ({ callUUID, digits }) => {
        const sid = RNTwilioPhone.getCallSid(callUUID);

        sid && TwilioPhone.sendDigits(sid, digits);
      }
    );

    return () => {
      RNTwilioPhone.removeCallKeepListeners();
    };
  }

  private static removeTwilioPhoneListeners() {
    twilioPhoneEmitter.removeAllListeners(EventType.CallInvite);
    twilioPhoneEmitter.removeAllListeners(EventType.CancelledCallInvite);
    twilioPhoneEmitter.removeAllListeners(EventType.CallRinging);
    twilioPhoneEmitter.removeAllListeners(EventType.CallConnected);
    twilioPhoneEmitter.removeAllListeners(EventType.CallDisconnected);
    twilioPhoneEmitter.removeAllListeners(EventType.CallDisconnectedError);
  }

  private static removeCallKeepListeners() {
    if (Platform.OS === 'ios') {
      RNCallKeep.removeEventListener('didDisplayIncomingCall');
      RNCallKeep.removeEventListener('didResetProvider');
      RNCallKeep.removeEventListener('didActivateAudioSession');
      RNCallKeep.removeEventListener('didDeactivateAudioSession');
    }

    RNCallKeep.removeEventListener('didReceiveStartCallAction');
    RNCallKeep.removeEventListener('answerCall');
    RNCallKeep.removeEventListener('endCall');
    RNCallKeep.removeEventListener('didPerformSetMutedCallAction');
    RNCallKeep.removeEventListener('didToggleHoldCallAction');
    RNCallKeep.removeEventListener('didPerformDTMFAction');
  }

  private static async registerTwilioPhone(deviceToken: string) {
    try {
      const accessToken = await RNTwilioPhone.fetchAccessToken();

      TwilioPhone.register(accessToken, deviceToken);
      RNTwilioPhone.deviceToken = deviceToken;
    } catch (e) {
      console.log(e);
    }
  }

  private static addCall(call: Call) {
    RNTwilioPhone.calls.push(call);
  }

  private static removeCall(uuid: string) {
    let index = -1;

    for (let i = 0; i < RNTwilioPhone.calls.length; i++) {
      if (RNTwilioPhone.calls[i].uuid === uuid) {
        index = i;
        break;
      }
    }

    if (index > -1) {
      RNTwilioPhone.calls.splice(index, 1);
    }
  }

  private static getCallUUID(sid: string) {
    for (const call of RNTwilioPhone.calls) {
      if (call.sid === sid) {
        return call.uuid;
      }
    }

    return null;
  }

  private static getCallSid(uuid: string) {
    for (const call of RNTwilioPhone.calls) {
      if (call.uuid === uuid) {
        return call.sid;
      }
    }

    return null;
  }
}

export { RNTwilioPhone };