import React from 'react';
import PropTypes from 'prop-types';
import RcSelect, { Option, OptGroup } from 'rc-select';
import classNames from 'classnames';
import enUS from '../locale-provider/en_US';
import warning from '../_util/warning';

export interface AbstractSelectProps {
  prefixCls?: string;
  className?: string;
  size?: 'default' | 'large' | 'small';
  notFoundContent?: React.ReactNode | null;
  transitionName?: string;
  choiceTransitionName?: string;
  showSearch?: boolean;
  allowClear?: boolean;
  disabled?: boolean;
  style?: React.CSSProperties;
  placeholder?: string;
  dropdownClassName?: string;
  dropdownStyle?: React.CSSProperties;
  dropdownMenuStyle?: React.CSSProperties;
  onSearch?: (value: string) => any;
  filterOption?: boolean | ((inputValue: string, option: Object) => any);
}

export interface LabeledValue {
  key: string;
  label: React.ReactNode;
}

export type SelectValue = string | any[] | LabeledValue | LabeledValue[];

export interface SelectProps extends AbstractSelectProps {
  value?: SelectValue;
  defaultValue?: SelectValue;
  mode?: 'default' | 'multiple' | 'tags' | 'combobox';
  multiple?: boolean;
  tags?: boolean;
  combobox?: boolean;
  optionLabelProp?: string;
  onChange?: (value: SelectValue) => void;
  onSelect?: (value: SelectValue, option: Object) => any;
  onDeselect?: (value: SelectValue) => any;
  onBlur?: () => any;
  onFocus?: () => any;
  dropdownMatchSelectWidth?: boolean;
  optionFilterProp?: string;
  defaultActiveFirstOption?: boolean;
  labelInValue?: boolean;
  getPopupContainer?: (triggerNode: Element) => HTMLElement;
  tokenSeparators?: string[];
  getInputElement?: () => React.ReactElement<any>;
}

export interface OptionProps {
  disabled?: boolean;
  value?: any;
  title?: string;
}

export interface OptGroupProps {
  label?: string | React.ReactElement<any>;
}

export interface SelectContext {
  antLocale?: {
    Select?: any,
  };
}

const SelectPropTypes = {
  prefixCls: PropTypes.string,
  className: PropTypes.string,
  size: PropTypes.oneOf(['default', 'large', 'small']),
  combobox: PropTypes.bool,
  notFoundContent: PropTypes.any,
  showSearch: PropTypes.bool,
  optionLabelProp: PropTypes.string,
  transitionName: PropTypes.string,
  choiceTransitionName: PropTypes.string,
};

// => It is needless to export the declaration of below two inner components.
// export { Option, OptGroup };

export default class Select extends React.Component<SelectProps, any> {
  static Option = Option as React.ClassicComponentClass<OptionProps>;
  static OptGroup = OptGroup as React.ClassicComponentClass<OptGroupProps>;

  static defaultProps = {
    prefixCls: 'ant-select',
    showSearch: false,
    transitionName: 'slide-up',
    choiceTransitionName: 'zoom',
  };

  static propTypes = SelectPropTypes;

  static contextTypes = {
    antLocale: PropTypes.object,
  };

  context: SelectContext;

  getLocale() {
    const { antLocale } = this.context;
    if (antLocale && antLocale.Select) {
      return antLocale.Select;
    }
    return enUS.Select;
  }

  render() {
    const {
      prefixCls,
      className = '',
      size,
      mode,
      // @deprecated
      multiple,
      tags,
      combobox,
      ...restProps,
    } = this.props;
    warning(
      !multiple && !tags && !combobox,
      '`Select[multiple|tags|combobox]` is deprecated, please use `Select[mode]` instead.',
    );

    const cls = classNames({
      [`${prefixCls}-lg`]: size === 'large',
      [`${prefixCls}-sm`]: size === 'small',
    }, className);

    const locale = this.getLocale();
    let { notFoundContent = locale.notFoundContent, optionLabelProp } = this.props;
    const isCombobox = mode === 'combobox' || combobox;
    if (isCombobox) {
      notFoundContent = null;
      // children 带 dom 结构时，无法填入输入框
      optionLabelProp = optionLabelProp || 'value';
    }

    const modeConfig = {
      multiple: mode === 'multiple' || multiple,
      tags: mode === 'tags' || tags,
      combobox: isCombobox,
    };

    return (
      <RcSelect
        {...restProps}
        {...modeConfig}
        prefixCls={prefixCls}
        className={cls}
        optionLabelProp={optionLabelProp || 'children'}
        notFoundContent={notFoundContent}
      />
    );
  }
}