import React, {Component} from 'react';
import PropTypes from 'prop-types';
import {
  View,
  Text,
  Image,
  Modal,
  TouchableHighlight,
  Platform,
  Animated,
  Keyboard
} from 'react-native';
import { DatePickerAndroid, DatePickerIOS, TimePickerAndroid } from '@react-native-community/datetimepicker';
import Style from './style';
import Moment from 'moment';

const FORMATS = {
  'date': 'YYYY-MM-DD',
  'datetime': 'YYYY-MM-DD HH:mm',
  'time': 'HH:mm'
};

const SUPPORTED_ORIENTATIONS = ['portrait', 'portrait-upside-down', 'landscape', 'landscape-left', 'landscape-right'];

class DatePicker extends Component {
  constructor(props) {
    super(props);

    this.state = {
      date: this.getDate(),
      modalVisible: false,
      animatedHeight: new Animated.Value(0),
      allowPointerEvents: true
    };

    this.getDate = this.getDate.bind(this);
    this.getDateStr = this.getDateStr.bind(this);
    this.datePicked = this.datePicked.bind(this);
    this.onPressDate = this.onPressDate.bind(this);
    this.onPressCancel = this.onPressCancel.bind(this);
    this.onPressConfirm = this.onPressConfirm.bind(this);
    this.onDateChange = this.onDateChange.bind(this);
    this.onPressMask = this.onPressMask.bind(this);
    this.onDatePicked = this.onDatePicked.bind(this);
    this.onTimePicked = this.onTimePicked.bind(this);
    this.onDatetimePicked = this.onDatetimePicked.bind(this);
    this.onDatetimeTimePicked = this.onDatetimeTimePicked.bind(this);
    this.setModalVisible = this.setModalVisible.bind(this);
  }

  componentWillReceiveProps(nextProps) {
    if (nextProps.date !== this.props.date) {
      this.setState({date: this.getDate(nextProps.date)});
    }
  }

  setModalVisible(visible) {
    const {height, duration} = this.props;

    // slide animation
    if (visible) {
      this.setState({modalVisible: visible});
      return Animated.timing(
        this.state.animatedHeight,
        {
          toValue: height,
          duration: duration
        }
      ).start();
    } else {
      return Animated.timing(
        this.state.animatedHeight,
        {
          toValue: 0,
          duration: duration
        }
      ).start(() => {
        this.setState({modalVisible: visible});
      });
    }
  }

  onStartShouldSetResponder(e) {
    return true;
  }

  onMoveShouldSetResponder(e) {
    return true;
  }

  onPressMask() {
    if (typeof this.props.onPressMask === 'function') {
      this.props.onPressMask();
    } else {
      this.onPressCancel();
    }
  }

  onPressCancel() {
    this.setModalVisible(false);

    if (typeof this.props.onCloseModal === 'function') {
      this.props.onCloseModal();
    }
  }

  onPressConfirm() {
    this.datePicked();
    this.setModalVisible(false);

    if (typeof this.props.onCloseModal === 'function') {
      this.props.onCloseModal();
    }
  }

  getDate(date = this.props.date) {
    const {mode, minDate, maxDate, format = FORMATS[mode]} = this.props;

    // date默认值
    if (!date) {
      let now = new Date();
      if (minDate) {
        let _minDate = this.getDate(minDate);

        if (now < _minDate) {
          return _minDate;
        }
      }

      if (maxDate) {
        let _maxDate = this.getDate(maxDate);

        if (now > _maxDate) {
          return _maxDate;
        }
      }

      return now;
    }

    if (date instanceof Date) {
      return date;
    }

    return Moment(date, format).toDate();
  }

  getDateStr(date = this.props.date) {
    const {mode, format = FORMATS[mode]} = this.props;

    const dateInstance = date instanceof Date
      ? date
      : this.getDate(date);

    if (typeof this.props.getDateStr === 'function') {
      return this.props.getDateStr(dateInstance);
    }

    return Moment(dateInstance).format(format);
  }

  datePicked() {
    if (typeof this.props.onDateChange === 'function') {
      this.props.onDateChange(this.getDateStr(this.state.date), this.state.date);
    }
  }

  getTitleElement() {
    const {date, placeholder, customStyles, allowFontScaling} = this.props;

    if (!date && placeholder) {
      return (
        <Text allowFontScaling={allowFontScaling} style={[Style.placeholderText, customStyles.placeholderText]}>
          {placeholder}
        </Text>
      );
    }
    return (
      <Text allowFontScaling={allowFontScaling} style={[Style.dateText, customStyles.dateText]}>
        {this.getDateStr()}
      </Text>
    );
  }

  onDateChange(date) {
    this.setState({
      allowPointerEvents: false,
      date: date
    });
    const timeoutId = setTimeout(() => {
      this.setState({
        allowPointerEvents: true
      });
      clearTimeout(timeoutId);
    }, 200);
  }

  onDatePicked({action, year, month, day}) {
    if (action !== DatePickerAndroid.dismissedAction) {
      this.setState({
        date: new Date(year, month, day)
      }, ()=>{
        this.datePicked();
      });
      
    } else {
      this.onPressCancel();
    }
  }

  onTimePicked({action, hour, minute}) {
    if (action !== DatePickerAndroid.dismissedAction) {
      this.setState({
        date: Moment().hour(hour).minute(minute).toDate()
      }, ()=>{
        this.datePicked();
      });
      
    } else {
      this.onPressCancel();
    }
  }

  onDatetimePicked({action, year, month, day}) {
    const {mode, androidMode, format = FORMATS[mode], is24Hour = !format.match(/h|a/)} = this.props;

    if (action !== DatePickerAndroid.dismissedAction) {
      let timeMoment = Moment(this.state.date);

      TimePickerAndroid.open({
        hour: timeMoment.hour(),
        minute: timeMoment.minutes(),
        is24Hour: is24Hour,
        mode: androidMode
      }).then(this.onDatetimeTimePicked.bind(this, year, month, day));
    } else {
      this.onPressCancel();
    }
  }

  onDatetimeTimePicked(year, month, day, {action, hour, minute}) {
    if (action !== DatePickerAndroid.dismissedAction) {
      this.setState({
        date: new Date(year, month, day, hour, minute)
      }, ()=>{
        this.datePicked();
      });
      
    } else {
      this.onPressCancel();
    }
  }

  onPressDate() {
    if (this.props.disabled) {
      return true;
    }

    Keyboard.dismiss();

    // reset state
    this.setState({
      date: this.getDate()
    }, ()=>{
      if (Platform.OS === 'ios') {
        this.setModalVisible(true);
      } else {
  
        const {mode, androidMode, format = FORMATS[mode], minDate, maxDate, is24Hour = !format.match(/h|a/)} = this.props;
  
        // 选日期
        if (mode === 'date') {
          DatePickerAndroid.open({
            date: this.state.date,
            minDate: minDate && this.getDate(minDate),
            maxDate: maxDate && this.getDate(maxDate),
            mode: androidMode
          }).then(this.onDatePicked);
        } else if (mode === 'time') {
          // 选时间
  
          let timeMoment = Moment(this.state.date);
  
          TimePickerAndroid.open({
            hour: timeMoment.hour(),
            minute: timeMoment.minutes(),
            is24Hour: is24Hour,
            mode: androidMode
          }).then(this.onTimePicked);
        } else if (mode === 'datetime') {
          // 选日期和时间
  
          DatePickerAndroid.open({
            date: this.state.date,
            minDate: minDate && this.getDate(minDate),
            maxDate: maxDate && this.getDate(maxDate),
            mode: androidMode
          }).then(this.onDatetimePicked);
        }
      }
  
      if (typeof this.props.onOpenModal === 'function') {
        this.props.onOpenModal();
      }
    });

    
  }

  _renderIcon() {
    const {
      showIcon,
      iconSource,
      iconComponent,
      customStyles
    } = this.props;

    if (showIcon) {
      if (iconComponent) {
        return iconComponent;
      }
      return (
        <Image
          style={[Style.dateIcon, customStyles.dateIcon]}
          source={iconSource}
        />
      );
    }

    return null;
  }

  render() {
    const {
      mode,
      style,
      customStyles,
      disabled,
      minDate,
      maxDate,
      minuteInterval,
      timeZoneOffsetInMinutes,
      cancelBtnText,
      confirmBtnText,
      TouchableComponent,
      testID,
      cancelBtnTestID,
      confirmBtnTestID,
      allowFontScaling,
      locale
    } = this.props;

    const dateInputStyle = [
      Style.dateInput, customStyles.dateInput,
      disabled && Style.disabled,
      disabled && customStyles.disabled
    ];

    return (
      <TouchableComponent
        style={[Style.dateTouch, style]}
        underlayColor={'transparent'}
        onPress={this.onPressDate}
        testID={testID}
      >
        <View style={[Style.dateTouchBody, customStyles.dateTouchBody]}>
          {
            !this.props.hideText ?
              <View style={dateInputStyle}>
                {this.getTitleElement()}
              </View>
            :
              <View/>
          }
          {this._renderIcon()}
          {Platform.OS === 'ios' && <Modal
            transparent={true}
            animationType="none"
            visible={this.state.modalVisible}
            supportedOrientations={SUPPORTED_ORIENTATIONS}
            onRequestClose={() => {this.setModalVisible(false);}}
          >
            <View
              style={{flex: 1}}
            >
              <TouchableComponent
                style={Style.datePickerMask}
                activeOpacity={1}
                underlayColor={'#00000077'}
                onPress={this.onPressMask}
              >
                <TouchableComponent
                  underlayColor={'#fff'}
                  style={{flex: 1}}
                >
                  <Animated.View
                    style={[Style.datePickerCon, {height: this.state.animatedHeight}, customStyles.datePickerCon]}
                  >
                    <View pointerEvents={this.state.allowPointerEvents ? 'auto' : 'none'}>
                      <DatePickerIOS
                        date={this.state.date}
                        mode={mode}
                        minimumDate={minDate && this.getDate(minDate)}
                        maximumDate={maxDate && this.getDate(maxDate)}
                        onDateChange={this.onDateChange}
                        minuteInterval={minuteInterval}
                        timeZoneOffsetInMinutes={timeZoneOffsetInMinutes ? timeZoneOffsetInMinutes : null}
                        style={[Style.datePicker, customStyles.datePicker]}
                        locale={locale}
                      />
                    </View>
                    <TouchableComponent
                      underlayColor={'transparent'}
                      onPress={this.onPressCancel}
                      style={[Style.btnText, Style.btnCancel, customStyles.btnCancel]}
                      testID={cancelBtnTestID}
                    >
                      <Text
                        allowFontScaling={allowFontScaling}
                        style={[Style.btnTextText, Style.btnTextCancel, customStyles.btnTextCancel]}
                      >
                        {cancelBtnText}
                      </Text>
                    </TouchableComponent>
                    <TouchableComponent
                      underlayColor={'transparent'}
                      onPress={this.onPressConfirm}
                      style={[Style.btnText, Style.btnConfirm, customStyles.btnConfirm]}
                      testID={confirmBtnTestID}
                    >
                      <Text allowFontScaling={allowFontScaling}
                            style={[Style.btnTextText, customStyles.btnTextConfirm]}
                      >
                        {confirmBtnText}
                      </Text>
                    </TouchableComponent>
                  </Animated.View>
                </TouchableComponent>
              </TouchableComponent>
            </View>
          </Modal>}
        </View>
      </TouchableComponent>
    );
  }
}

DatePicker.defaultProps = {
  mode: 'date',
  androidMode: 'default',
  date: '',
  // component height: 216(DatePickerIOS) + 1(borderTop) + 42(marginTop), IOS only
  height: 259,

  // slide animation duration time, default to 300ms, IOS only
  duration: 300,
  confirmBtnText: '确定',
  cancelBtnText: '取消',
  iconSource: require('./date_icon.png'),
  customStyles: {},

  // whether or not show the icon
  showIcon: true,
  disabled: false,
  allowFontScaling: true,
  hideText: false,
  placeholder: '',
  TouchableComponent: TouchableHighlight,
  modalOnResponderTerminationRequest: e => true
};

DatePicker.propTypes = {
  mode: PropTypes.oneOf(['date', 'datetime', 'time']),
  androidMode: PropTypes.oneOf(['clock', 'calendar', 'spinner', 'default']),
  date: PropTypes.oneOfType([PropTypes.string, PropTypes.instanceOf(Date), PropTypes.object]),
  format: PropTypes.string,
  minDate: PropTypes.oneOfType([PropTypes.string, PropTypes.instanceOf(Date)]),
  maxDate: PropTypes.oneOfType([PropTypes.string, PropTypes.instanceOf(Date)]),
  height: PropTypes.number,
  duration: PropTypes.number,
  confirmBtnText: PropTypes.string,
  cancelBtnText: PropTypes.string,
  iconSource: PropTypes.oneOfType([PropTypes.number, PropTypes.object]),
  iconComponent: PropTypes.element,
  customStyles: PropTypes.object,
  showIcon: PropTypes.bool,
  disabled: PropTypes.bool,
  allowFontScaling: PropTypes.bool,
  onDateChange: PropTypes.func,
  onOpenModal: PropTypes.func,
  onCloseModal: PropTypes.func,
  onPressMask: PropTypes.func,
  placeholder: PropTypes.string,
  modalOnResponderTerminationRequest: PropTypes.func,
  is24Hour: PropTypes.bool,
  getDateStr: PropTypes.func,
  locale: PropTypes.string
};

export default DatePicker;