// @flow
import { css } from 'styled-components';
import { theme } from '../theme';

export const hexa = (hex: string, alpha: number) => {
  const r = parseInt(hex.slice(1, 3), 16);

  const g = parseInt(hex.slice(3, 5), 16);

  const b = parseInt(hex.slice(5, 7), 16);

  if (alpha >= 0) {
    return `rgba(${r}, ${g}, ${b}, ${alpha})`;
  }
  return `rgb(${r}, ${g}, ${b})`;
};

export const tint = (hex: string, amount: number) => {
  let R = parseInt(hex.substring(1, 3), 16);
  let G = parseInt(hex.substring(3, 5), 16);
  let B = parseInt(hex.substring(5, 7), 16);

  const getSingle = (number: number) =>
    parseInt((number * (100 + amount)) / 100, 10);

  R = getSingle(R);
  G = getSingle(G);
  B = getSingle(B);

  R = R < 255 ? R : 255;
  G = G < 255 ? G : 255;
  B = B < 255 ? B : 255;

  const getDouble = (number: number) =>
    number.toString(16).length === 1
      ? `0${number.toString(16)}`
      : number.toString(16);

  const RR = getDouble(R);
  const GG = getDouble(G);
  const BB = getDouble(B);

  return `#${RR}${GG}${BB}`;
};

export const Shadows = {
  default: css`
    box-shadow: ${theme.shadows.default};
    transition: ${theme.animations.default};
  `,
  hover: css`
    box-shadow: ${theme.shadows.hover};
    transition: ${theme.animations.hover};
  `,
  active: css`
    box-shadow: ${theme.shadows.active};
    transition: ${theme.animations.active};
  `,
};

export const Content = css`
  h1 {
    font-size: 40px;
    font-weight: 700;
    color: ${props => props.theme.text.default};
    margin-top: 28px;
  }

  h2 {
    font-size: 32px;
    font-weight: 700;
    color: ${props => props.theme.text.default};
    margin-top: 26px;
  }

  h3 {
    font-size: 24px;
    font-weight: 600;
    color: ${props => props.theme.text.default};
    margin-top: 24px;
  }

  h4 {
    font-size: 20px;
    font-weight: 600;
    color: ${props => props.theme.text.default};
    margin-top: 16px;
  }

  h5 {
    font-size: 18px;
    font-weight: 600;
    color: ${props => props.theme.text.default};
    margin-top: 16px;
  }

  h6 {
    font-size: 16px;
    font-weight: 500;
    color: ${props => props.theme.text.default};
    margin-top: 16px;
    text-transform: uppercase;
  }

  p {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.6;
    color: ${props => props.theme.text.secondary};
    margin-top: 16px;
  }

  a {
    color: ${props => props.theme.brand.default};
    font-weight: 500;
  }

  a:hover {
    text-decoration: none;
    color: ${props => tint(props.theme.brand.default, -40)};
  }

  a:hover button {
    text-decoration: none !important;
  }

  ul,
  ol {
    margin-left: 24px;
    margin-top: 12px;
    margin-bottom: 16px;
    font-size: 18px;
    font-weight: 400;
    line-height: 1.5;
    color: ${props => props.theme.text.secondary};
    margin-top: 16px;
  }

  li {
    line-height: 1.6;
    padding: 4px 0;
  }

  strong {
    font-weight: 600;
  }
`;

export const Truncate = (width: number) => css`
  width: ${width}px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
`;

export const shuffleArray = (array: Array<any>) => {
  for (let i = array.length - 1; i > 0; i -= 1) {
    const j = Math.floor(Math.random() * (i + 1));
    const temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }
  return array;
};