import Picker from 'react-month-picker'

    constructor(props, context) {
        super(props, context)

        this.state = {
            singleValue: {year: 2014, month: 11},
            singleValue2: {year: 2016, month: 7},
            multiValue: [ {year: 2016, month: 7}, {year: 2016, month: 11}, {year: 2017, month: 3}, {year: 2019, month: 5}, ],
            rangeValue: {from: {year: 2014, month: 8}, to: {year: 2015, month: 5}},
            rangeValue2: {from: {year: 2013, month: 11}, to: {year: 2016, month: 3}},
        }

        this.pickAMonth = React.createRef()
        this.pickAMonth2 = React.createRef()
        this.pickMulti = React.createRef()
        this.pickRange = React.createRef()
        this.pickRange2 = React.createRef()
    }

    render() {
        const pickerLang = {
            months: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
            from: 'From', to: 'To',
        }
        const { singleValue, singleValue2, multiValue, rangeValue, rangeValue2, } = this.state
    
        const makeText = m => {
            if (m && m.year && m.month) return (pickerLang.months[m.month-1] + '. ' + m.year)
            return '?'
        }
    
        return (
            <ul>
                <li>
                    <label><b>Pick A Month</b><span>(Available years: 2008, 2011, 2012, 2014, 2016)</span></label>
                    <div className="edit">
                        <Picker
                            ref={this.pickAMonth}
                            years={[2008, 2011, 2012, 2014, 2016, 2018, 2020]}
                            value={singleValue}
                            lang={pickerLang.months}
                            onChange={this.handleAMonthChange}
                            onDismiss={this.handleAMonthDissmis}
                        >
                            <MonthBox value={makeText(singleValue)} onClick={this.handleClickMonthBox} />
                        </Picker>
                    </div>
                </li>
                <li>
                    <label><b>Pick A Month</b><span>(Available months from Feb.2016 to Sep.2016)</span></label>
                    <div className="edit">
                        <Picker
                            ref={this.pickAMonth2}
                            years={{min: {year: 2016, month: 2}, max: {year: 2016, month: 9}}}
                            value={singleValue2}
                            lang={pickerLang.months}
                            theme="dark"
                            onChange={this.handleAMonthChange2}
                            onDismiss={this.handleAMonthDissmis2}
                        >
                            <MonthBox value={makeText(singleValue2)} onClick={this.handleClickMonthBox2} />
                        </Picker>
                    </div>
                </li>
                <li>
                    <label><b>Pick Several Month</b><span>(Available months from Feb.2016 to Apr.2020)</span></label>
                    <div className="edit">
                        <Picker
                            ref={this.pickMulti}
                            years={{min: {year: 2016, month: 2}, max: {year: 2020, month: 4}}}
                            value={multiValue}
                            lang={pickerLang.months}
                            theme="dark"
                            onChange={this.handleMultiChange}
                            onDismiss={this.handleMultiDissmis}
                        >
                            <MonthBox value={multiValue.map(v => makeText(v)).join(' | ')} onClick={this.handleClickMultiBox} />
                        </Picker>
                    </div>
                </li>
                <li>
                    <label><b>Pick A Span of Months</b><span>(Available years from 2013 to this year)</span></label>
                    <div className="edit">
                        <Picker
                            ref={this.pickRange}
                            years={{min: 2013}}
                            value={rangeValue}
                            lang={pickerLang}
                            theme="light"
                            onChange={this.handleRangeChange}
                            onDismiss={this.handleRangeDissmis}
                        >
                            <MonthBox value={makeText(rangeValue.from) + ' ~ ' + makeText(rangeValue.to)} onClick={this._handleClickRangeBox} />
                        </Picker>
                    </div>
                </li>
                <li>
                    <label><b>Pick A Span of Months</b><span>(Available months from Apr.2013 to Sep.2016)</span></label>
                    <div className="edit">
                        <Picker
                            ref={this.pickRange2}
                            years={{min: {year: 2012, month: 4}, max: {year: 2017, month: 9}}}
                            value={rangeValue2}
                            lang={pickerLang}
                            theme="dark"
                            onChange={this.handleRangeChange2}
                            onDismiss={this.handleRangeDissmis2}
                        >
                            <MonthBox value={makeText(rangeValue2.from) + ' ~ ' + makeText(rangeValue2.to)} onClick={this._handleClickRangeBox2} />
                        </Picker>
                    </div>
                </li>
            </ul>
        )
    }