App.js

import React from 'react';
import { Platform, StatusBar, StyleSheet, View } from 'react-native';
import { AppLoading, Asset, Font, Icon } from 'expo';
import AppNavigator from './navigation/AppNavigator';
const port = require('./dev_port.json');

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      isLoadingComplete: false,
      favorites: null,
      currentSearch: '',
      currentSearchCategory: 'Beer',
      initSearch: false,
      updateProfile: false,
      user_id: 1
    };

    this.changeSearch = this.changeSearch.bind(this);
    this.changeSearchCategory = this.changeSearchCategory.bind(this);
    this.updateFavorites = this.updateFavorites.bind(this);
    this.profileUpdate = this.profileUpdate.bind(this);
    this.initiateSearch = this.initiateSearch.bind(this);
  }

  componentDidMount() {
    this.updateFavorites();
  }

  // Updates the favorites list when beers are added or removed by clicking
  // the star button on the beer details page.
  updateFavorites() {
    let url = `${port.DEV_PORT}/api/user/${this.state.user_id}/favorites`;
    fetch(url)
      .then(res => res.json())
      .then(data => {
        this.setState ({ favorites: data.result, })
      })
      .catch(error => {
        console.error(error);
      });
  }

  changeSearch(event) {
    this.setState({ currentSearch: event });
  }

  changeSearchCategory(event) {
    this.setState({ currentSearchCategory: event });
  }

  initiateSearch() {
    this.setState({ initSearch: !this.state.initSearch });
  }

  profileUpdate() {
    this.setState({ updateProfile: !this.state.updateProfile});
  }
  
  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <View style={styles.container}>
          {Platform.OS === 'ios' && <StatusBar barStyle="default" />}
          <AppNavigator
            screenProps={{
              user_id: this.state.user_id,
              favorites: this.state.favorites,
              updateFavorites: this.updateFavorites,
              changeSearch: this.changeSearch,
              changeSearchCategory: this.changeSearchCategory,
              currentSearch: this.state.currentSearch,
              currentSearchCategory: this.state.currentSearchCategory,
              initiateSearch: this.initiateSearch,
              initSearch: this.state.initSearch,
              profileUpdate: this.profileUpdate,
              updateProfile: this.state.updateProfile
              }}/>
        </View>
      );
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Font.loadAsync({
        // This is the font that we are using for our tab bar
        ...Icon.Ionicons.font,
        'MaterialIcons': require('@expo/vector-icons/fonts/MaterialIcons.ttf'),
        // We include SpaceMono because we use it in HomeScreen.js. Feel free
        // to remove this if you are not using it in your app
        'space-mono': require('./assets/fonts/SpaceMono-Regular.ttf'),
      }),
    ]);
   };

  _handleLoadingError = error => {
    // In this case, you might want to report the error to your error
    // reporting service, for example Sentry
    console.warn(error);
  };

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true });
  };
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
  },
});