import React, { PropTypes } from 'react';
import Trigger from 'rc-trigger';
import Panel from './Panel';
import placements from './placements';
import moment from 'moment';

function noop() {
}

function refFn(field, component) {
  this[field] = component;
}

const Picker = React.createClass({
  propTypes: {
    prefixCls: PropTypes.string,
    clearText: PropTypes.string,
    value: PropTypes.object,
    defaultOpenValue: PropTypes.object,
    disabled: PropTypes.bool,
    allowEmpty: PropTypes.bool,
    defaultValue: PropTypes.object,
    open: PropTypes.bool,
    defaultOpen: PropTypes.bool,
    align: PropTypes.object,
    placement: PropTypes.any,
    transitionName: PropTypes.string,
    getPopupContainer: PropTypes.func,
    placeholder: PropTypes.string,
    format: PropTypes.string,
    showHour: PropTypes.bool,
    style: PropTypes.object,
    className: PropTypes.string,
    showSecond: PropTypes.bool,
    disabledHours: PropTypes.func,
    disabledMinutes: PropTypes.func,
    disabledSeconds: PropTypes.func,
    hideDisabledOptions: PropTypes.bool,
    onChange: PropTypes.func,
    onOpen: PropTypes.func,
    onClose: PropTypes.func,
  },

  getDefaultProps() {
    return {
      clearText: 'clear',
      prefixCls: 'rc-time-picker',
      defaultOpen: false,
      style: {},
      className: '',
      align: {},
      defaultOpenValue: moment(),
      allowEmpty: true,
      showHour: true,
      showSecond: true,
      disabledHours: noop,
      disabledMinutes: noop,
      disabledSeconds: noop,
      hideDisabledOptions: false,
      placement: 'bottomLeft',
      onChange: noop,
      onOpen: noop,
      onClose: noop,
    };
  },

  getInitialState() {
    this.savePanelRef = refFn.bind(this, 'panelInstance');
    const { defaultOpen, defaultValue, open = defaultOpen, value = defaultValue } = this.props;
    return {
      open,
      value,
    };
  },

  componentWillReceiveProps(nextProps) {
    const { value, open } = nextProps;
    if ('value' in nextProps) {
      this.setState({
        value,
      });
    }
    if (open !== undefined) {
      this.setState({ open });
    }
  },

  onPanelChange(value) {
    this.setValue(value);
  },

  onPanelClear() {
    this.setValue(null);
    this.setOpen(false);
  },

  onVisibleChange(open) {
    this.setOpen(open);
  },

  onEsc() {
    this.setOpen(false);
    this.refs.picker.focus();
  },

  onKeyDown(e) {
    if (e.keyCode === 40) {
      this.setOpen(true);
    }
  },

  setValue(value) {
    if (!('value' in this.props)) {
      this.setState({
        value,
      });
    }
    this.props.onChange(value);
  },

  getFormat() {
    const format = this.props.format;
    if (format) {
      return format;
    }
    if (!this.props.showSecond) {
      return 'HH:mm';
    }
    if (!this.props.showHour) {
      return 'mm:ss';
    }
    return 'HH:mm:ss';
  },

  getPanelElement() {
    const {
      prefixCls, placeholder, disabledHours,
      disabledMinutes, disabledSeconds, hideDisabledOptions,
      allowEmpty, showHour, showSecond, defaultOpenValue, clearText,
    } = this.props;
    return (
      <Panel
        clearText={clearText}
        prefixCls={`${prefixCls}-panel`}
        ref={this.savePanelRef}
        value={this.state.value}
        onChange={this.onPanelChange}
        onClear={this.onPanelClear}
        defaultOpenValue={defaultOpenValue}
        showHour={showHour}
        onEsc={this.onEsc}
        showSecond={showSecond}
        allowEmpty={allowEmpty}
        format={this.getFormat()}
        placeholder={placeholder}
        disabledHours={disabledHours}
        disabledMinutes={disabledMinutes}
        disabledSeconds={disabledSeconds}
        hideDisabledOptions={hideDisabledOptions}
      />
    );
  },

  setOpen(open, callback) {
    const { onOpen, onClose } = this.props;
    if (this.state.open !== open) {
      this.setState({
        open,
      }, callback);
      const event = {
        open,
      };
      if (open) {
        onOpen(event);
      } else {
        onClose(event);
      }
    }
  },

  render() {
    const {
      prefixCls, placeholder, placement, align,
      disabled, transitionName, style, className, showHour,
      showSecond, getPopupContainer,
    } = this.props;
    const { open, value } = this.state;
    let popupClassName;
    if (!showHour || !showSecond) {
      popupClassName = `${prefixCls}-panel-narrow`;
    }
    return (
      <Trigger
        prefixCls={`${prefixCls}-panel`}
        popupClassName={popupClassName}
        popup={this.getPanelElement()}
        popupAlign={align}
        builtinPlacements={placements}
        popupPlacement={placement}
        action={disabled ? [] : ['click']}
        destroyPopupOnHide
        getPopupContainer={getPopupContainer}
        popupTransitionName={transitionName}
        popupVisible={open}
        onPopupVisibleChange={this.onVisibleChange}
      >
        <span className={`${prefixCls} ${className}`} style={style}>
          <input
            className={`${prefixCls}-input`}
            ref="picker" type="text" placeholder={placeholder}
            readOnly
            onKeyDown={this.onKeyDown}
            disabled={disabled} value={value && value.format(this.getFormat()) || ''}
          />
          <span className={`${prefixCls}-icon`}/>
        </span>
      </Trigger>
    );
  },
});

export default Picker;