/**
 * Copyright 2004-present Facebook. All Rights Reserved.
 * @flow
 */
'use strict';

var React = require('react-native');
var StyleSheet = require('StyleSheet');
var {
  ActivityIndicatorIOS,
  StyleSheet,
  Text,
  TextInput,
  TouchableOpacity,
  View,
  WebView
} = React;

var HEADER = '#3b5998';
var BGWASH = 'rgba(255,255,255,0.8)';
var DISABLED_WASH = 'rgba(255,255,255,0.25)';

var TEXT_INPUT_REF = 'urlInput';
var WEBVIEW_REF = 'webview';
var DEFAULT_URL = 'https://m.facebook.com';

var WebViewExample = React.createClass({

  getInitialState: function() {
    return {
      url: DEFAULT_URL,
      status: 'No Page Loaded',
      backButtonEnabled: false,
      forwardButtonEnabled: false,
      loading: true,
    };
  },

  inputText: '',

  handleTextInputChange: function(event) {
    this.inputText = event.nativeEvent.text;
  },

  render: function() {
    this.inputText = this.state.url;

    return (
      <View style={[styles.container]}>
        <View style={[styles.addressBarRow]}>
          <TouchableOpacity onPress={this.goBack}>
            <View style={this.state.backButtonEnabled ? styles.navButton : styles.disabledButton}>
              <Text>
                 {'<'}
              </Text>
            </View>
          </TouchableOpacity>
          <TouchableOpacity onPress={this.goForward}>
            <View style={this.state.forwardButtonEnabled ? styles.navButton : styles.disabledButton}>
              <Text>
                {'>'}
              </Text>
            </View>
          </TouchableOpacity>
          <TextInput
            ref={TEXT_INPUT_REF}
            autoCapitalize="none"
            value={this.state.url}
            onSubmitEditing={this.onSubmitEditing}
            onChange={this.handleTextInputChange}
            clearButtonMode="while-editing"
            style={styles.addressBarTextInput}
          />
          <TouchableOpacity onPress={this.pressGoButton}>
            <View style={styles.goButton}>
              <Text>
                 Go!
              </Text>
            </View>
          </TouchableOpacity>
        </View>
        <WebView
          ref={WEBVIEW_REF}
          automaticallyAdjustContentInsets={false}
          style={styles.webView}
          url={this.state.url}
          renderError={this.renderError}
          renderLoading={this.renderLoading}
          onNavigationStateChange={this.onNavigationStateChange}
          startInLoadingState={true}
        />
        <View style={styles.statusBar}>
          <Text style={styles.statusBarText}>{this.state.status}</Text>
        </View>
      </View>
    );
  },

  goBack: function() {
    this.refs[WEBVIEW_REF].goBack();
  },

  goForward: function() {
    this.refs[WEBVIEW_REF].goForward();
  },

  reload: function() {
    this.refs[WEBVIEW_REF].reload();
  },

  onNavigationStateChange: function(navState) {
    this.setState({
      backButtonEnabled: navState.canGoBack,
      forwardButtonEnabled: navState.canGoForward,
      url: navState.url,
      status: navState.title,
      loading: navState.loading,
    });
  },

  renderError: function(errorDomain, errorCode, errorDesc) {
    return (
      <View style={styles.errorContainer}>
        <Text style={styles.errorTextTitle}>
          Error loading page
        </Text>
        <Text style={styles.errorText}>
          {'Domain: ' + errorDomain}
        </Text>
        <Text style={styles.errorText}>
          {'Error Code: ' + errorCode}
        </Text>
        <Text style={styles.errorText}>
          {'Description: ' + errorDesc}
        </Text>
      </View>
    );
  },

  renderLoading: function() {
    return (
      <View style={styles.loadingView}>
        <ActivityIndicatorIOS />
      </View>
    );
  },

  onSubmitEditing: function(event) {
    this.pressGoButton();
  },

  pressGoButton: function() {
    var url = this.inputText.toLowerCase();
    if (url === this.state.url) {
      this.reload();
    } else {
      this.setState({
        url: url,
      });
    }
    // dismiss keyoard
    this.refs[TEXT_INPUT_REF].blur();
  },

});

var styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: HEADER,
  },
  addressBarRow: {
    flexDirection: 'row',
    padding: 8,
  },
  webView: {
    backgroundColor: BGWASH,
    height: 350,
  },
  addressBarTextInput: {
    backgroundColor: BGWASH,
    borderColor: 'transparent',
    borderRadius: 3,
    borderWidth: 1,
    height: 24,
    paddingLeft: 10,
    paddingTop: 3,
    paddingBottom: 3,
    flex: 1,
    fontSize: 14,
  },
  navButton: {
    width: 20,
    padding: 3,
    marginRight: 3,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: BGWASH,
    borderColor: 'transparent',
    borderRadius: 3,
  },
  disabledButton: {
    width: 20,
    padding: 3,
    marginRight: 3,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: DISABLED_WASH,
    borderColor: 'transparent',
    borderRadius: 3,
  },
  goButton: {
    height: 24,
    padding: 3,
    marginLeft: 8,
    alignItems: 'center',
    backgroundColor: BGWASH,
    borderColor: 'transparent',
    borderRadius: 3,
    alignSelf: 'stretch',
  },
  loadingView: {
    backgroundColor: BGWASH,
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  errorContainer: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: BGWASH,
  },
  errorTextTitle: {
    fontSize: 15,
    fontWeight: 'bold',
    marginBottom: 10,
  },
  errorText: {
    fontSize: 14,
    textAlign: 'center',
    marginBottom: 2,
  },
  statusBar: {
    flexDirection: 'row',
    alignItems: 'center',
    paddingLeft: 5,
    height: 22,
  },
  statusBarText: {
    color: 'white',
    fontSize: 13,
  },
  spinner: {
    width: 20,
    marginRight: 6,
  },
});

exports.title = '<WebView>';
exports.description = 'Base component to display web content';
exports.examples = [
  {
    title: 'WebView',
    render(): ReactElement { return <WebViewExample />; }
  }
];