import React, {PropTypes, Component} from 'react';
import GregorianCalendar from 'gregorian-calendar';
import CalendarLocale from 'rc-calendar/lib/locale/zh_CN';
import FullCalendar from 'rc-calendar/lib/FullCalendar';
import {PREFIX_CLS} from './Constants';
import Header from './Header';

function noop () { return null; }

function zerofixed (v) {
  if (v < 10) return '0' + v;
  return v + '';
}

function getNow() {
  const value = new GregorianCalendar();
  value.setTime(Date.now());
  return value;
}

class Calendar extends Component {
  constructor(props) {
    super();
    this.state = {
      value: props.value || getNow(),
      type: props.type,
    };
  }
  monthCellRender(value, locale) {
    const prefixCls = this.props.prefixCls;
    const month = value.getMonth();
    return <div className={`${prefixCls}-fullscreen-month`}>
      <span>{locale.format.shortMonths[month]}</span>
      {this.props.monthCellRender(value)}
    </div>;
  }
  fullscreenDateCellRender(value) {
    const prefixCls = this.props.prefixCls;
    return <span className={`${prefixCls}-fullscreen-date`}>
      <span>{ zerofixed(value.getDayOfMonth()) }</span>
      {this.props.dateCellRender(value)}
    </span>;
  }
  dateCellRender(value) {
    const prefixCls = this.props.prefixCls;
    return <div style={{ position: 'relative' }}>
      <span className={`${prefixCls}-date ${prefixCls}-notes-date`}>
        {zerofixed(value.getDayOfMonth())}
      </span>
      {this.props.dateCellRender(value)}
    </div>;
  }
  setValue(value) {
    if (this.state.value !== value) {
      this.setState({ value });
      this.props.onChange(value);
    }
  }
  setType(type) {
    const oldType = this.state.type;
    this.setState({ type });
    this.props.onTypeChange(type, oldType);
  }
  onPanelChange(value) {
    if (this.state.type === 'month') {
      this.setType('date');
    }
    this.setValue(value);
  }
  render() {
    const props = this.props;
    const {value, type} = this.state;
    const {locale, prefixCls, style, className, fullscreen} = props;
    const dateCellRender = fullscreen
      ? this.fullscreenDateCellRender : this.dateCellRender;

    return (
      <div className={prefixCls + '-wrapper' + (className ? ' ' + className : '') + (fullscreen ? ' ' + prefixCls + '-wrapper-fullscreen' : '' )} style={style}>
        <Header
          fullscreen={fullscreen}
          type={type}
          value={value}
          locale={locale}
          prefixCls={`${prefixCls}`}
          onTypeChange={this.setType.bind(this)}
          onValueChange={this.setValue.bind(this)}/>
        <FullCalendar
          {...props}
          type={type}
          prefixCls={`${prefixCls}`}
          showHeader={false}
          value={value}
          onChange={this.onPanelChange.bind(this)}
          monthCellRender={ this.monthCellRender.bind(this) }
          dateCellRender={ dateCellRender.bind(this) } />
      </div>
    );
  }
}

Calendar.propTypes = {
  monthCellRender: PropTypes.func,
  dateCellRender: PropTypes.func,
  fullscreen: PropTypes.bool,
  locale: PropTypes.object,
  prefixCls: PropTypes.string,
  className: PropTypes.string,
  style: PropTypes.object,
  onChange: PropTypes.func,
  onTypeChange: PropTypes.func,
};

Calendar.defaultProps = {
  monthCellRender: noop,
  dateCellRender: noop,
  locale: CalendarLocale,
  fullscreen: true,
  prefixCls: PREFIX_CLS,
  onChange: noop,
  onTypeChange: noop,
  type: 'date',
};

export default Calendar;