import 'babel-polyfill'; // required for @ledgerhq/hw-transport-u2f

import React from 'react';
import { get } from 'lodash';

import Bridge from './bridge/Bridge';
import Walletgen from './walletgen/Walletgen';
// import { AppNavigation } from './common/components/AppNavigation'

import './common/style/index.css';
import './bridge/style/index.css';

class Root extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      appView: 'bridge',
    };

    this.setView = this.setView.bind(this);
  }

  /*
    Style switching:

    To switch between walletgen and bridge styles without them clobbering each
    other, we need a way to identify which app the stylesheet belongs to.

    So we include a "walletgen" or "bridge" style as the first rule of any
    stylesheet. If this directive is included, we can disable the appropriate
    sheet when the user switches applications

    A bit hacky, but does the job for now. These styles should probably be
    fully merged at some point.
  */

  isWalletgenStyle(styleSheet) {
    return get(styleSheet, 'cssRules[0].selectorText', null) === 'walletgen';
  }

  isBridgeStyle(styleSheet) {
    return get(styleSheet, 'cssRules[0].selectorText', null) === 'bridge';
  }

  disableStylesheets(appView) {
    for (var i = 0; i < document.styleSheets.length; i++) {
      let styleSheet = document.styleSheets[i];

      if (appView === 'bridge') {
        if (this.isWalletgenStyle(styleSheet)) styleSheet.disabled = true;
        if (this.isBridgeStyle(styleSheet)) styleSheet.disabled = false;
      } else if (appView === 'walletgen') {
        if (this.isWalletgenStyle(styleSheet)) styleSheet.disabled = false;
        if (this.isBridgeStyle(styleSheet)) styleSheet.disabled = true;
      }
    }
  }

  componentDidMount() {
    this.disableStylesheets(this.state.appView);
  }

  setView(appView) {
    this.disableStylesheets(appView);

    this.setState({
      appView,
    });
  }

  render() {
    const { appView } = this.state;

    switch (appView) {
      case 'walletgen':
        return <Walletgen appView={appView} setView={this.setView} />;
      case 'bridge':
        return <Bridge appView={appView} setView={this.setView} />;
      default:
        throw new Error(`Unknown appView ${appView}`);
    }
  }
}

export { Root };