'use strict';

import React, { Animated, PixelRatio, Image, StyleSheet, Text, TouchableOpacity, View, NavigationExperimental, Dimensions, Platform, BackAndroid, Alert } from 'react-native';
import {Actions} from 'react-native-router-flux';
import CONFIG from '../constants/config';

const {
    AnimatedView: NavigationAnimatedView,
    Card: NavigationCard,
    RootContainer: NavigationRootContainer,
    Header: NavigationHeader,
    } = NavigationExperimental;

export default class NavBar extends React.Component {
  static defaultProps = {
    drawerImage: require('../images/menu_burger.png'),
    backButtonImage: require('../images/menu_back.png')
  };
  componentWillMount() {
    const state = this.props.navigationState;
    this._renderRightButton = this._renderRightButton.bind(this);
    this._renderBackButton = this._renderBackButton.bind(this);
    this._renderLeftButton = this._renderLeftButton.bind(this);
    this._renderTitle = this._renderTitle.bind(this);
    this._renderUserInfo = this._renderUserInfo.bind(this);
    if (Platform.OS === 'android') {
      BackAndroid.addEventListener('hardwareBackPress', this._onBackAndroid);
    }
  }
  componentWillUnmount() {
    if (Platform.OS === 'android') {
      BackAndroid.removeEventListener('hardwareBackPress', this._onBackAndroid);
    }
  }
  render() {
    let state = this.props.navigationState;
    const child = state.children[state.index];
    let selected = state.children[state.index];
    while (selected.hasOwnProperty('children')) {
      state = selected;
      selected = selected.children[selected.index];
    }

    let renderLeftButton = selected.renderLeftButton || this._renderLeftButton;
    let renderRightButton = selected.renderRightButton || this._renderRightButton;
    let renderBackButton = selected.renderBackButton || this._renderBackButton;
    let renderTitle = selected.renderTitle;
    let renderUserInfo = this._renderUserInfo;
    let sceneKey = state.sceneKey;
    return (

            <Animated.View style={[styles.header, this.props.navigationBarStyle, state.navigationBarStyle, selected.navigationBarStyle]}
    >
              <Image source={require('../images/navbar.png')} style={[styles.image, CONFIG.sceneKey.user === sceneKey && styles.imageMy]}>
                  {selected.renderTitle ? selected.renderTitle(state) : state.children.map(this._renderTitle, this)}
                  {renderBackButton() || renderLeftButton()}
                  {renderRightButton()}
                  {renderUserInfo(sceneKey)}
              </Image>
            </Animated.View>

        );
  }

  _renderBackButton() {
    const state = this.props.navigationState;
    const childState = state.children[state.index];
    let buttonImage = childState.backButtonImage || state.backButtonImage || this.props.backButtonImage;
    let onPress = Actions.pop;

    if (state.index === 0) {
      return null;
    }

    let text = childState.backTitle ? <Text style={[styles.barBackButtonText, this.props.backButtonTextStyle, state.backButtonTextStyle, childState.backButtonTextStyle]}>
            {childState.backTitle}
        </Text> : null;

    return (
            <TouchableOpacity testID="backNavButton" style={[styles.backButton, this.props.leftButtonStyle, state.leftButtonStyle, childState.leftButtonStyle]} onPress={onPress}>
                {buttonImage && <Image source={buttonImage} style={[styles.backButtonImage, this.props.leftButtonIconStyle, state.barButtonIconStyle, state.leftButtonIconStyle, childState.leftButtonIconStyle]} />}
                {text}
            </TouchableOpacity>
        );
  }

  _renderRightButton() {
    const self = this;
    const state = this.props.navigationState;
    function tryRender(state) {
      if (state.rightButton) {
        const Button = state.rightButton;
        return <Button {...self.props} {...state} key={'rightNavBarBtn'} testID="rightNavButton" style={[styles.rightButton, state.rightButtonStyle]} />;
      }
      if (state.onRight && (state.rightTitle || state.rightButtonImage)) {
        return (
                    <TouchableOpacity key={'rightNavBarBtn'} testID="rightNavButton" style={[styles.rightButton, state.rightButtonStyle]}
                      onPress={state.onRight.bind(null, state)}
        >
                        {state.rightTitle && <Text style={[styles.barRightButtonText, state.rightButtonTextStyle]}>{state.rightTitle}</Text>}
                        {state.rightButtonImage && <View style={{ flex:1, justifyContent:'center', alignItems:'flex-end' }}><Image source={state.rightButtonImage} style={state.rightButtonIconStyle} /></View>}
                    </TouchableOpacity>
                );
      }
      if ((!!state.onRight ^ !!(state.rightTitle || state.rightButtonImage))) {
        console.warn('Both onRight and rightTitle/rightButtonImage must be specified for the scene: ' + state.name);
      }
    }
    return tryRender(this.props);
  }

  _renderLeftButton() {
    const self = this;
    const drawer = this.context.drawer;
    const state = this.props.navigationState;
    function tryRender(state) {
      let onPress = state.onLeft;
      let buttonImage = state.leftButtonImage;

      if (state.leftButton) {
        const Button = state.leftButton;
        return <Button {...self.props} {...state} key={'leftNavBarBtn'} testID="leftNavButton" style={[styles.leftButton, state.leftButtonStyle]} />;
      }

      if (!!drawer && typeof drawer.toggle === 'function') {
        buttonImage = state.drawerImage;
        if (buttonImage) {
          onPress = drawer.toggle;
        }
      }

      if (onPress && (state.leftTitle || buttonImage)) {
        return (
                    <TouchableOpacity key={'leftNavBarBtn'} testID="leftNavButton" style={[styles.leftButton, state.leftButtonStyle]} onPress={onPress.bind(null, state)}>
                        {state.leftTitle && <Text style={[styles.barLeftButtonText, state.leftButtonTextStyle]}>{state.leftTitle}</Text>}
                        {buttonImage && <View style={{ flex:1, justifyContent:'center', alignItems:'flex-start' }}><Image source={buttonImage} style={state.leftButtonIconStyle} /></View>}
                    </TouchableOpacity>
                );
      }
      if ((!!state.onLeft ^ !!(state.leftTitle || buttonImage))) {
        console.warn('Both onLeft and leftTitle/leftButtonImage must be specified for the scene: ' + state.name);
      }
    }
    return tryRender(this.props);
  }

  _renderTitle(childState: NavigationState, index:number) {

    const title = this.props.getTitle ? this.props.getTitle(childState) : childState.title;
    return (
            <Animated.Text
              key={childState.key}
              style={[
                styles.title, this.props.titleStyle, this.props.navigationState.titleStyle, childState.titleStyle,
                {
                  opacity: this.props.position.interpolate({
                    inputRange: [index - 1, index, index + 1],
                    outputRange: [0, 1, 0],
                  }),
                  left: this.props.position.interpolate({
                    inputRange: [index - 1, index + 1],
                    outputRange: [200, -200],
                  }),
                  right: this.props.position.interpolate({
                    inputRange: [index - 1, index + 1],
                    outputRange: [-200, 200],
                  }),
                },
              ]}
    >
                {title}
            </Animated.Text>
        );
  }

  _renderUserInfo(sceneKey) {

    if (CONFIG.sceneKey.user === sceneKey) {
      return (
          <View style={styles.userInfoContainer}  >
              <Text style={styles.userInfoTitle} onPress={() => {Actions.Logout();}}>vans旗舰店</Text>
              <Image source={require('../images/white.png')} style={styles.whiteArrow}/>
          </View>

      );
    }

  }

  _onBackAndroid = () => {
    let sceneKey = this.props.navigationState.sceneKey;
    if (CONFIG.sceneKey.root === sceneKey) {
        Actions.pop();
        return true;
    }
    return false;
  }

}


NavBar.contextTypes = {
  drawer: React.PropTypes.object
};

const styles = StyleSheet.create({
  image: {
    width: Dimensions.get('window').width,
    height: (Platform.OS === 'android') ? 50 : 64,
  },
  imageMy: {
    height: 120,
  },
  title: {
    textAlign: 'center',
    marginTop: (Platform.OS === 'android') ? 0 : 10,
    fontSize: 18,
    fontWeight: '500',
    color: '#0A0A0A',
    position: 'absolute',
    top: (Platform.OS === 'android') ? 15 : 20,
    left: 0,
    right: 0,
  },
  header: {
    // backgroundColor: '#EFEFF2',
    paddingTop: 0,
    top: 0,
    height: 64,
    right: 0,
    left: 0,
    // borderBottomWidth: 0.5,
    // borderBottomColor: '#828287',
    position: 'absolute',
  },
  backButton: {
    width: 130,
    height: 37,
    position: 'absolute',
    bottom: 4,
    left: 2,
    padding: 8,
    flexDirection: 'row',
  },
  rightButton: {
    width: 100,
    height: 37,
    position: 'absolute',
    bottom: 4,
    right: 2,
    padding: 8,
  },
  leftButton: {
    width: 100,
    height: 37,
    position: 'absolute',
    bottom: 4,
    left: 2,
    padding: 8,
  },
  barRightButtonText: {
    color: 'rgb(0, 122, 255)',
    textAlign: 'right',
    fontSize: 17,
  },
  barBackButtonText: {
    color: 'rgb(0, 122, 255)',
    textAlign: 'left',
    fontSize: 17,
    paddingLeft: 6,
  },
  barLeftButtonText: {
    color: 'rgb(0, 122, 255)',
    textAlign: 'left',
    fontSize: 17,
  },
  backButtonImage: {
    width: 13,
    height: 21,
  },
  rightButtonIconStyle: {

  },
  userInfoContainer: {
    width: Dimensions.get('window').width,
    height: 120,
  },
  userInfoTitle: {
    position: 'absolute',
    left: 0,
    right: 0,
    bottom: 33,
    fontSize: 14,
    textAlign: 'center',
    color: '#ffffff',
  },
  whiteArrow: {
    position: 'absolute',
    right: 15,
    bottom: 33,
  }
});