const cssBuilder = (
  gutter: string | number,
  negative: boolean,
  gutterType: string,
  gutterPosition: string[],
): string => {
  let negativeBoolean = negative;
  let operator = negativeBoolean ? '-' : '';
  let isString = false;
  let gutterSize = gutter;

  if (typeof gutterSize === 'string') {
    isString = true;
    gutterSize = stripUnit(gutterSize);
  }

  const remValue = rem(+gutterSize / 2);

  // If the value is already negative, remove the operator and set negative to true.
  if (!isString && gutterSize < 0) {
    negativeBoolean = true;
    operator = '';
  }

  // If we have declared negative gutters, force type to `margin.
  const gType = negativeBoolean ? 'margin' : gutterType;

  let css = '';

  for (const gutterPositionItem of gutterPosition) {
    css += `${gType}-${gutterPositionItem}: ${operator}${remValue};`;
  }

  return css;
};

export const CellOffset = (
  size: number | string,
  breakpoint: string,
  gutterType: string = 'margin',
  vertical: boolean = false,
  rtl: boolean = false,
  gutters: GuttersProps = DefaultGutters,
  mediaQueryOptions: MediaQueryOptionsProps = MediaQueryOptions,
): string => {
  let direction;

  if (vertical) {
    direction = 'top';
  } else if (rtl) {
    direction = 'right';
  } else {
    direction = 'left';
  }

  let lastBreakpointName = 'small';

  if (gutters[breakpoint] === undefined) {
    for (const breakpointName in mediaQueryOptions.breakpoints) {
      if (typeof breakpointName === 'string' && gutters[breakpointName] !== undefined) {
        lastBreakpointName = breakpointName;
      }
    }
  } else {
    lastBreakpointName = breakpoint;
  }

  let lastBreakpoint: number;

  if (typeof gutters[lastBreakpointName] === 'string') {
    lastBreakpoint = +stripUnit(`${gutters[lastBreakpointName]}`);
  } else {
    lastBreakpoint = +gutters[lastBreakpointName];
  }

  const gutter = rem(lastBreakpoint / 2);
  const gutterSize =
    gutterType === 'margin' ? `calc(${CellSize(size)} + ${gutter})` : CellSize(size);
  const css = `margin-${direction}: ${gutterSize};`;

  return mediaquery(breakpoint, mediaQueryOptions)`${css}`;
};

const calcHeading = (
  heading: number,
  fontSize: string,
  lineHeight: number,
  breakpoints: {},
  mediaQuery: MediaQueryOptionsProps,
): FlattenSimpleInterpolation => {
  if (Object.entries(breakpoints).length === 0) {
    throw new Error('Cant be empty @todo error message');
  }

  const size = stripUnit(em(fontSize));
  const lineHeightSpacing = (factor = 1): number => {
    return size * lineHeight * factor;
  };
  const spacingValue = lineHeightSpacing();
  const mediaqueries: string[] = [];

  for (const key in breakpoints) {
    if (Array.isArray(breakpoints[key])) {
      const calcSize = size * breakpoints[key][heading];
      let calcLineHeight = 0;
      let multiplier = 1;

      if (calcSize <= spacingValue) {
        calcLineHeight = spacingValue / calcSize;
      } else {
        while (lineHeightSpacing(multiplier) < calcSize) {
          multiplier += 0.5;
        }

        calcLineHeight = lineHeightSpacing(multiplier) / calcSize;
      }

      mediaqueries.push(mediaquery(key, mediaQuery)`
        font-size: ${em(calcSize, size)};
        line-height: ${calcLineHeight};
        font-weight: 700;
      `);
    }
  }

  return css`
    ${mediaqueries}
  `;
};