import React, { useState, useEffect, useCallback } from 'react';
import PropTypes from 'prop-types';
import { useTranslation } from 'react-i18next';
import AppContainer from '../../../services/AppContainer';
import { withUnstatedContainers } from '../../UnstatedUtils';
import { toastSuccess, toastError } from '../../../util/apiNotification';

import AccessTokenSettings from './AccessTokenSettings';
import OfficialBotSettings from './OfficialBotSettings';
import CustomBotWithoutProxySettings from './CustomBotWithoutProxySettings';
import CustomBotWithProxySettings from './CustomBotWithProxySettings';
import ConfirmBotChangeModal from './ConfirmBotChangeModal';
import BotTypeCard from './BotTypeCard';

const botTypes = ['officialBot', 'customBotWithoutProxy', 'customBotWithProxy'];

const SlackIntegration = (props) => {
  const { appContainer } = props;
  const { t } = useTranslation();
  const [currentBotType, setCurrentBotType] = useState(null);
  const [selectedBotType, setSelectedBotType] = useState(null);
  const [accessToken, setAccessToken] = useState('');
  const [slackSigningSecret, setSlackSigningSecret] = useState('');
  const [slackBotToken, setSlackBotToken] = useState('');
  const [slackSigningSecretEnv, setSlackSigningSecretEnv] = useState('');
  const [slackBotTokenEnv, setSlackBotTokenEnv] = useState('');
  const [isConnectedToSlack, setIsConnectedToSlack] = useState(null);
  const [isRgisterSlackCredentials, setIsRgisterSlackCredentials] = useState(false);


  const fetchData = useCallback(async() => {
    try {
      const response = await appContainer.apiv3.get('slack-integration/');
      const { currentBotType, customBotWithoutProxySettings, accessToken } = response.data.slackBotSettingParams;
      const {
        slackSigningSecret, slackBotToken, slackSigningSecretEnvVars, slackBotTokenEnvVars,
      } = customBotWithoutProxySettings;

      setCurrentBotType(currentBotType);
      setAccessToken(accessToken);
      setSlackSigningSecret(slackSigningSecret);
      setSlackBotToken(slackBotToken);
      setSlackSigningSecretEnv(slackSigningSecretEnvVars);
      setSlackBotTokenEnv(slackBotTokenEnvVars);
      setIsConnectedToSlack(isConnectedToSlack);

      if ((slackBotToken && slackSigningSecret) || (slackBotTokenEnv && slackSigningSecretEnv)) {
        setIsRgisterSlackCredentials(true);
      }

    }
    catch (err) {
      toastError(err);
    }
  }, [appContainer.apiv3, isConnectedToSlack, slackBotTokenEnv, slackSigningSecretEnv]);

  useEffect(() => {
    fetchData();
  }, [fetchData]);

  const handleBotTypeSelect = (clickedBotType) => {
    if (clickedBotType === currentBotType) {
      return;
    }
    if (currentBotType === null) {
      setCurrentBotType(clickedBotType);
      return;
    }
    setSelectedBotType(clickedBotType);
  };

  const cancelBotChangeHandler = () => {
    setSelectedBotType(null);
  };

  const changeCurrentBotSettingsHandler = async() => {
    try {
      const res = await appContainer.apiv3.put('slack-integration/custom-bot-without-proxy', {
        slackSigningSecret: '',
        slackBotToken: '',
        currentBotType: selectedBotType,
      });
      setCurrentBotType(res.data.customBotWithoutProxySettingParams.slackBotType);
      setSelectedBotType(null);
      toastSuccess(t('admin:slack_integration.bot_reset_successful'));
    }
    catch (err) {
      toastError(err);
    }
  };

  const generateTokenHandler = async() => {
    try {
      await appContainer.apiv3.put('slack-integration/access-token');
      fetchData();
    }
    catch (err) {
      toastError(err);
    }
  };

  const discardTokenHandler = async() => {
    try {
      await appContainer.apiv3.delete('slack-integration/access-token');
      fetchData();
      toastSuccess(t('admin:slack_integration.bot_reset_successful'));
    }
    catch (err) {
      toastError(err);
    }
  };

  let settingsComponent = null;

  switch (currentBotType) {
    case 'officialBot':
      settingsComponent = <OfficialBotSettings />;
      break;
    case 'customBotWithoutProxy':
      settingsComponent = (
        <CustomBotWithoutProxySettings {
          ...{
                slackBotToken,
                slackBotTokenEnv,
                slackSigningSecret,
                slackSigningSecretEnv,
                isConnectedToSlack,
                isRgisterSlackCredentials,
              }
            }
        />
      );
      break;
    case 'customBotWithProxy':
      settingsComponent = <CustomBotWithProxySettings />;
      break;
  }


  return (
    <>
      <ConfirmBotChangeModal
        isOpen={selectedBotType != null}
        onConfirmClick={changeCurrentBotSettingsHandler}
        onCancelClick={cancelBotChangeHandler}
      />

      <AccessTokenSettings
        accessToken={accessToken}
        onClickDiscardButton={discardTokenHandler}
        onClickGenerateToken={generateTokenHandler}
      />

      <div className="selecting-bot-type my-5">
        <h2 className="admin-setting-header mb-4">
          {t('admin:slack_integration.selecting_bot_types.slack_bot')}
          <span className="ml-2 btn-link">
            <span className="mr-1">{t('admin:slack_integration.selecting_bot_types.detailed_explanation')}</span>
            {/* TODO: add an appropriate link by GW-5614 */}
            <i className="fa fa-external-link" aria-hidden="true"></i>
          </span>

        </h2>

        {t('admin:slack_integration.selecting_bot_types.selecting_bot_type')}

        <div className="row my-4">
          <div className="card-deck mx-auto">
            {botTypes.map((botType) => {
              return (
                <BotTypeCard
                  key={botType}
                  botType={botType}
                  isActive={currentBotType === botType}
                  handleBotTypeSelect={handleBotTypeSelect}
                />
              );
            })}
          </div>
        </div>
      </div>

      {settingsComponent}
    </>
  );
};

const SlackIntegrationWrapper = withUnstatedContainers(SlackIntegration, [AppContainer]);

SlackIntegration.propTypes = {
  appContainer: PropTypes.instanceOf(AppContainer).isRequired,
};

export default SlackIntegrationWrapper;