import * as React from 'react';
import classNames from 'classnames';
import styled from 'styled-components';

type Props = {
  name: string;
  elements: React.Node[];
};

type State = {
  collapsed: boolean;
};

const Container = styled.div`
  margin-bottom: 1em;
`;

const Wrapper = styled.div`
  padding: 0 0.75rem;
`;

export default class CardColumnGroup extends React.Component<Props, State> {
  constructor(props: Props) {
    super(props);
    this.state = {
      collapsed: false,
    };
  }

  toggleCollapse = () => {
    this.setState(prevState => ({
      collapsed: !prevState.collapsed,
    }));
  };

  isLastEntry = (array: React.Node[], index: number) => {
    return index === array.length - 1;
  };

  isLengthOdd = (array: React.Node[]) => {
    return array.length % 2 !== 0;
  };

  isFullSize = (array: React.Node[], index: number) => {
    return this.isLastEntry(array, index) && this.isLengthOdd(array);
  };

  render() {
    const { name, elements } = this.props;
    const { collapsed } = this.state;

    const icon = collapsed ? 'fa-angle-right' : 'fa-angle-down';
    let content = null;
    if (!collapsed) {
      content = elements.map((entry, index) => {
        const fullColumnWidth = this.isFullSize(elements, index);
        const sizeClass = fullColumnWidth ? 'is-full' : 'is-half';
        return (
          <div
            className={classNames(
              'box',
              'box-link-shadow',
              'column',
              'is-clipped',
              sizeClass,
            )}
            key={index}
          >
            {entry}
          </div>
        );
      });
    }
    return (
      <Container>
        <h2>
          <span
            className={classNames('is-size-4', 'has-cursor-pointer')}
            onClick={this.toggleCollapse}
          >
            <i className={classNames('fa', icon)} /> {name}
          </span>
        </h2>
        <hr />
        <Wrapper className={classNames('columns', 'is-multiline')}>
          {content}
        </Wrapper>
        <div className="is-clearfix" />
      </Container>
    );
  }
}