/*
 * based on
 * github.com/roylee0704/react-flexbox-grid/blob/master/src/components/Col.js
 */

const constants = require('../../shared/constants');
const isUndefined = require('lodash.isundefined');
const fns = require('../../shared/functions');
const Styled = require('styled-components');

const {
  breakpoints,
  sizes
} = constants;

const {
  calc
} = fns;

const {
  default: styled,
  css
} = Styled;

const padding = sizes.halfGutterWidth || '0.5rem';

const direction = (size) => (props) => {
  return props[size] ? 'column-reverse' : 'column';
};

const width = (fallback) => (size) => (props) => {
  return !isUndefined(props[size])
    ? calc(`(${props[size]} / ${sizes.gridColumns}) * 100%`)
    : fallback;
};

const flexed = (...args) => (props) => {
  const isBasic = (
    !props.xs &&
    !props.sm &&
    !props.md &&
    !props.lg
  );

  return !isBasic ? css(...args) : css``;
};

const flexBasis = width('auto');
const maxWidth = width('none');
const marginLeft = width(0);

const breakpoint = (prop, size) => {
  return (...args) => (props) => props[prop] && breakpoints[size](...args);
};

const sm = breakpoint('sm', 'small');
const smOffset = breakpoint('smOffset', 'small');
const md = breakpoint('md', 'medium');
const mdOffset = breakpoint('mdOffset', 'medium');
const lg = breakpoint('lg', 'large');
const lgOffset = breakpoint('lgOffset', 'large');

module.exports = styled.div`
  box-sizing: border-box;
  padding-left: ${padding};
  padding-right: ${padding};

  ${flexed`
    flex: 0 0 auto;
    flex-grow: 1;

    flex-basis: ${flexBasis('xs')};
    max-width: ${maxWidth('xs')};
    margin-left: ${marginLeft('xsOffset')};
    flex-direction: ${direction('xsReverse')};
  `}

  ${sm`
    flex-basis: ${flexBasis('sm')};
    max-width: ${maxWidth('sm')};
    flex-direction: ${direction('smReverse')};
  `}

  ${smOffset`
    margin-left: ${marginLeft('smOffset')};
  `}

  ${md`
    flex-basis: ${flexBasis('md')};
    max-width: ${maxWidth('md')};
    flex-direction: ${direction('mdReverse')};
  `}

  ${mdOffset`
    margin-left: ${marginLeft('mdOffset')};
  `}

  ${lg`
    flex-basis: ${flexBasis('lg')};
    max-width: ${maxWidth('lg')};
    flex-direction: ${direction('lgReverse')};
  `}

  ${lgOffset`
    margin-left: ${marginLeft('lgOffset')};
  `}
`;