/**
 * Toast
 * Created by chenyxi on 2020/3/17.
 */
import React,{Component}from 'react';
import {
  StyleSheet,
  View,
  Easing,
  Dimensions,
  Text,
  Animated,
  ActivityIndicator,
  Keyboard,
  Platform
} from 'react-native';
import PropTypes from 'prop-types';

const {width,height} = Dimensions.get('window');
//iphoneX
const X_WIDTH = 375;
const X_HEIGHT = 812;
//显示时长
const DURATION = 1500;
// Toast提示框透明度
const OPACITY = 0.8;

class ToastView extends Component {
  
  static PropTypes = {
    message : PropTypes.string,
    time: PropTypes.number,
    isShow:PropTypes.bool,
    toastStartPosition:PropTypes.string,
    marginBottom:PropTypes.number,
    containerTop:PropTypes.number
  }
  
  dismissHandler = null;
  isShow = false;

  constructor(props) {
    super(props);
    this.state = {
        message:'',
        time:DURATION,
        isShow:false,
        toastStartPosition:'center',//toast展示的位置，默认中间位置
        opacityAnimate: new Animated.Value(OPACITY), // 动画 值初始化
        marginBottom:0,//距离底部高度
        containerTop:0//距离顶部偏移
    }
  }

  componentWillUnmount() {
    //在页面生命周期结束时，解除定时器，避免内存泄露
    clearTimeout(this.dismissHandler);
  }

  show(message, position = 'center') {
    if(this.isShow){
        clearTimeout(this.dismissHandler);
        this.state.isShow = false;
    }
    this.isShow = true;
    this.state.toastStartPosition = 'center';
    this.state.marginBottom = 0;
    this.state.containerTop = 0;
     this.setState({
         isShow:true,
         message:message
     });
     this.state.opacityAnimate.setValue(OPACITY);
     this.state.isShow =true;
     if (this.dismissHandler) {
         clearTimeout(this.dismissHandler);
     }
     this.dismissHandler = setTimeout(() => {
         // 开启动画
         Animated.timing(this.state.opacityAnimate, {
             toValue: 0.0,
             duration: 600,
         }).start(() => {
             // 动画结束后，初始化状态
             this.setState({
                 isShow: false,
             });
             this.isShow = false;
             this.onDismiss();
         });
     }, this.state.time);
  }

  onDismiss = () => {
    if (this.props.onDismiss) {
        this.props.onDismiss()
    }
  }

  //判断是否iphoneX
  isIphoneX = () => {
    return (
      Platform.OS === 'ios' && ((height === X_HEIGHT && width === X_WIDTH) || (height === X_WIDTH && width === X_HEIGHT))
    )
  }

  render() {
    return this.state.isShow ?(
        <View style={[styles.container,{marginTop:this.state.containerTop}]} pointerEvents='none' >{/*pointerEvents='none'*/}
          <Animated.View style={[styles.textContainer, { opacity: this.state.opacityAnimate,alignSelf:this.state.toastStartPosition,marginBottom:this.state.marginBottom}]}>
            <Text
              style={styles.defaultText}>{this.state.message}
            </Text>
          </Animated.View>
        </View>
    ):null
  }
}

const styles = StyleSheet.create({
  textContainer: {
      backgroundColor: 'rgba(0,0,0,.8)',
      borderRadius: 8,
      padding: 10,
      maxWidth: width/5*4,
      justifyContent: 'center',
      alignItems: 'center',
  },
  defaultText: {
      color: "#FFF",
      fontSize: 15,
  },
  container: {
      position: "absolute",
      width: width,
      height: height,
      zIndex: 99999,
      flexDirection: "row",
      justifyContent: "center",
      alignItems: 'center',

  }
});

export default ToastView