import React, {useEffect, useState} from 'react';
import {TFunction, useTranslation} from 'react-i18next';
import QRCode from 'react-native-qrcode-svg';

import {Centered, Button, Column, Text} from '../../components/ui';
import {Theme} from '../../components/ui/styleUtils';
import {useRequestScreen} from './RequestScreenController';
import BluetoothStateManager from 'react-native-bluetooth-state-manager';
import {Platform} from 'react-native';
import Storage from '../../shared/storage';
import {ErrorMessageOverlay} from '../../components/MessageOverlay';
import {
  NavigationProp,
  useFocusEffect,
  useNavigation,
} from '@react-navigation/native';
import {MainBottomTabParamList} from '../../routes/main';
import {BOTTOM_TAB_ROUTES} from '../../routes/routesConstants';

type RequestStackParamList = {
  RequestScreen: undefined;
  ReceiveVcScreen: undefined;
};

type RequestLayoutNavigation = NavigationProp<
  RequestStackParamList & MainBottomTabParamList
>;

export const RequestScreen: React.FC = () => {
  const {t} = useTranslation('RequestScreen');
  const controller = useRequestScreen();
  const props: RequestScreenProps = {t, controller};
  const [isBluetoothOn, setIsBluetoothOn] = useState(false);
  const navigation = useNavigation<RequestLayoutNavigation>();

  useEffect(() => {
    (async () => {
      await BluetoothStateManager.onStateChange(state => {
        if (state === 'PoweredOff') {
          setIsBluetoothOn(false);
        } else {
          setIsBluetoothOn(true);
        }
      }, true);
    })();
  }, [isBluetoothOn]);

  return (
    <Column
      fill
      padding="24"
      align="space-between"
      backgroundColor={Theme.Colors.lightGreyBackgroundColor}>
      {loadQRCode()}
      {controller.isMinimumStorageLimitReached && (
        <ErrorMessageOverlay
          isVisible={controller.isMinimumStorageLimitReached}
          error="errors.storageLimitReached"
          onDismiss={() => {
            navigation.navigate(BOTTOM_TAB_ROUTES.home);
          }}
          translationPath="RequestScreen"
        />
      )}
    </Column>
  );

  function loadQRCode() {
    if (controller.isNearByDevicesPermissionDenied) {
      return <NearByPrompt {...props} />;
    }
    if (
      (controller.isBluetoothDenied || !isBluetoothOn) &&
      controller.isReadyForBluetoothStateCheck
    ) {
      return <BluetoothPrompt {...props} />;
    }
    if (
      !controller.isCheckingBluetoothService &&
      !controller.isBluetoothDenied
    ) {
      return (
        <Column align="flex-end" fill>
          {controller.isWaitingForConnection && <SharingQR {...props} />}
          <StatusMessage {...props} />
        </Column>
      );
    }
  }
};

const BluetoothPrompt: React.FC<RequestScreenProps> = ({t}) => {
  return (
    <Centered fill>
      <Text color={Theme.Colors.errorMessage} align="center" margin="0 10">
        {t(
          Platform.OS === 'ios' ? 'bluetoothStateIos' : 'bluetoothStateAndroid',
        )}
      </Text>
    </Centered>
  );
};

const NearByPrompt: React.FC<RequestScreenProps> = ({t, controller}) => {
  return (
    <Column fill align="space-between">
      <Centered fill>
        <Text color={Theme.Colors.errorMessage} align="center">
          {t('errors.nearbyDevicesPermissionDenied.message')}
        </Text>
      </Centered>
      <Button
        title={t('errors.nearbyDevicesPermissionDenied.button')}
        onPress={controller.GOTO_SETTINGS}
      />
    </Column>
  );
};

const SharingQR: React.FC<RequestScreenProps> = ({t, controller}) => {
  return (
    <React.Fragment>
      <Text align="center">{t('showQrCode')}</Text>

      <Centered fill>
        {controller.openId4VpUri !== '' ? (
          <QRCode
            size={200}
            value={controller.openId4VpUri}
            backgroundColor={Theme.Colors.QRCodeBackgroundColor}
          />
        ) : null}
      </Centered>
    </React.Fragment>
  );
};

const StatusMessage: React.FC<RequestScreenProps> = ({t, controller}) => {
  return (
    controller.statusMessage !== '' && (
      <Column elevation={1} padding="16 24">
        <Text>{controller.statusMessage}</Text>
        {controller.statusHint !== '' && (
          <Text size="small" color={Theme.Colors.textLabel}>
            {controller.statusHint}
          </Text>
        )}
        {controller.isStatusCancellable && (
          <Button
            margin={[8, 0, 0, 0]}
            title={t('cancel', {ns: 'common'})}
            loading={controller.isCancelling}
            onPress={controller.CANCEL}
          />
        )}
      </Column>
    )
  );
};

interface RequestScreenProps {
  t: TFunction;
  controller: ReturnType<typeof useRequestScreen>;
}