import React, { Children } from 'react'
import {
  TouchableOpacity,
  View,
  Dimensions,
  Animated,
  Easing,
  PanResponder,
} from 'react-native'
import PropTypes from 'prop-types'
import CarouselItem from './carouselItem'

export default class CarouselHorizontal extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      translateX: new Animated.Value(0),
      fresh: true,
    }
    this.index = 0
    this.scrollOffset = {
      startX: 0,
      endX: 0,
      directionX: 'R',
    }

    this.panResponder = props.enableScroll
      ? PanResponder.create({
          onStartShouldSetPanResponder: (evt, gestureState) => {},
          onStartShouldSetPanResponderCapture: (evt, gestureState) => {
            this.props.hasTouch && this.props.hasTouch(true)
          },

          onMoveShouldSetResponderCapture: () => true,
          onMoveShouldSetPanResponder: (evt, gestureState) => true,
          onMoveShouldSetPanResponderCapture: () => true,
          onPanResponderGrant: (evt, gestureState) => {
            //

            // if (this.props.panResponBool) {
            //   this.props.hasTouch && this.props.hasTouch(true);
            // }
            this.scrollOffset.startX = evt.nativeEvent.pageX
          },
          onPanResponderRelease: (evt, gestureState) => {
            this.scrollOffset.endX = evt.nativeEvent.pageX
            this.directionJudg()
            this.index =
              this.scrollOffset.directionX == 'R' ? this.index - 2 : this.index
            if (this.index <= -2) {
              this.index = 0
            } else {
              this.scrollCarousel(this.props.children.length)
            }
            //
            // if (this.props.panResponBool) {
            // this.props.hasTouch && this.props.hasTouch(false);
            // }
          },
          onShouldBlockNativeResponder: (evt, gestureState) => {
            this.props.hasTouch && this.props.hasTouch(false)
            // 返回一个布尔值，决定当前组件是否应该阻止原生组件成为JS响应者
            // 默认返回true。目前暂时只支持android。
            return true
          },
        })
      : {
          panHandlers: {},
        }
  }
  static propTypes = {
    width: PropTypes.number,
    imgTouch: PropTypes.func,
    activeOpacity: PropTypes.number,
    enableScroll: PropTypes.bool,
    delayTime: PropTypes.number,
    duration: PropTypes.number,
    tintColor: PropTypes.string,
    progressBar: PropTypes.bool,
    panResponBool: PropTypes.bool,
  }
  static defaultProps = {
    width: Dimensions.get('window').width,
    activeOpacity: 1,
    imgTouch: () => {},
    enableScroll: false,
    delayTime: 5000,
    duration: 300,
    tintColor: 'red',
    progressBar: true,
    panResponBool: false,
    touchArrStyle: {
      bottom: '20%',
      flexDirection: 'row',
    },
    entertouchItemStyle: {
      marginRight: 5,
      width: 20,
      height: 5,
      borderRadius: 5,
    },
    touchItemStyle: {
      backgroundColor: '#FFF',
      opacity: 0.5,
      marginRight: 5,
      width: 5,
      height: 5,
      borderRadius: 5,
    },
  }

  componentDidMount() {
    this.scrollTimer = setInterval(
      () => this.scrollCarousel(this.props.children.length),
      this.props.delayTime
    )
  }
  //组件将被卸载
  componentWillUnmount() {
    //重写组件的setState方法，直接返回空
    this.setState = (state, callback) => {
      return
    }
  }

  directionJudg() {
    this.scrollOffset.directionX =
      this.scrollOffset.endX - this.scrollOffset.startX > 0 ? 'R' : 'L'
  }

  scrollCarousel(count, stopTimer) {
    let styleWidth = -this.props.width
    this.index++
    if (this._animated) {
      this._animated.stop()
    }
    this._animated = Animated.timing(this.state.translateX, {
      toValue: styleWidth * this.index,
      duration: this.props.duration,
      Easing: Easing.linear,
    }).start(() => {
      if (this.index >= count) {
        this.index = 0
        this.state.translateX.setValue(0)
      }
      this.setState({ fresh: !this.state.fresh })
    })
  }

  render() {
    let touchArr = []

    for (let i = 0; i < this.props.children.length; i++) {
      if (this.index == i) {
        touchArr.push(
          <View
            key={i}
            style={[
              this.props.entertouchItemStyle,
              { backgroundColor: this.props.tintColor },
            ]}
          />
        )
      } else {
        touchArr.push(<View key={i} style={[this.props.touchItemStyle]} />)
      }
    }
    return (
      <View
        style={{
          // width: this.props.width * this.props.children.length,
          flex: 1,
        }}
      >
        <Animated.View
          {...this.panResponder.panHandlers}
          style={[
            {
              width: this.props.width * this.props.children.length,
              overflow: 'hidden',
              flexDirection: 'row',
              justifyContent: 'flex-start',
            },
            {
              transform: [
                {
                  translateX: this.state.translateX,
                },
              ],
            },
          ]}
        >
          {Children.map(this.props.children, (child, index) => (
            <CarouselItem
              item={child}
              index={index}
              imgTouch={e => this.props.imgTouch(e)}
              activeOpacity={this.props.activeOpacity}
              width={this.props.width}
            />
          ))}
        </Animated.View>
        {this.props.progressBar ? (
          <View
            style={[
              {
                alignSelf: 'center',
              },
              this.props.touchArrStyle,
            ]}
          >
            {touchArr}
          </View>
        ) : null}
      </View>
    )
  }
}