import React from 'react';
import remcalc from 'remcalc';
import PropTypes from 'prop-types';
import is, { isOr } from 'styled-is';
import styled, { css } from 'styled-components';
import { A, Button as NButton } from 'normalized-styled-components';
import { Link } from 'react-router-dom';
import { borderRadius } from '../boxes';
import typography from '../typography';
import Baseline from '../baseline';
import StatusLoader from '../status-loader';

// Based on bootstrap 4
const style = css`
  box-sizing: border-box;
  display: inline-block;
  justify-content: center;
  align-items: center;

  min-height: ${remcalc(48)};
  height: ${remcalc(48)};
  min-width: ${remcalc(120)};
  margin-bottom: ${remcalc(8)};
  margin-top: ${remcalc(8)};
  padding: ${remcalc(15)} ${remcalc(18)};
  position: relative;

  ${typography.normal};
  ${typography.loadedFontFamily};
  font-size: ${remcalc(15)};
  text-align: center;
  font-style: normal;
  font-stretch: normal;
  line-height: normal;
  letter-spacing: normal;
  text-decoration: none;

  white-space: nowrap;
  vertical-align: middle;
  touch-action: manipulation;
  cursor: pointer;

  color: ${props => props.theme.white};
  background-image: none;
  background-color: ${props => props.theme.primary};
  border-radius: ${borderRadius};
  border: solid ${remcalc(1)} ${props => props.theme.primaryActive};

  &:focus {
    outline: 0;
    text-decoration: none;
    background-color: ${props => props.theme.primary};
    border-color: ${props => props.theme.primaryActive};
  }

  &:hover {
    background-color: ${props => props.theme.primaryHover};
    border: solid ${remcalc(1)} ${props => props.theme.primaryActive};
  }

  &:active,
  &:active:hover,
  &:active:focus {
    background-image: none;
    outline: 0;
    background-color: ${props => props.theme.primaryActive};
    border-color: ${props => props.theme.primaryActive};
  }

  &[disabled] {
    cursor: not-allowed;
    pointer-events: none;
  }

  ${is('secondary')`
    color: ${props => props.theme.secondary};
    background-color: ${props => props.theme.white};
    border-color: ${props => props.theme.grey};

    &:focus {
      background-color: ${props => props.theme.white};
      border-color: ${props => props.theme.grey};
    }

    &:hover {
      background-color: ${props => props.theme.whiteHover};
      border-color: ${props => props.theme.grey};
    }

    &:active,
    &:active:hover,
    &:active:focus {
      background-color: ${props => props.theme.whiteActive};
      border-color: ${props => props.theme.grey};
    }
  `};

  ${is('error')`
    color: ${props => props.theme.red};
    background-color: ${props => props.theme.white};
    border-color: ${props => props.theme.red};
    font-weight: 600;

    &:focus {
      background-color: ${props => props.theme.white};
      border-color: ${props => props.theme.red};
    }

    &:hover {
      background-color: ${props => props.theme.whiteHover};
      border-color: ${props => props.theme.red};
    }

    &:active,
    &:active:hover,
    &:active:focus {
      background-color: ${props => props.theme.whiteActive};
      border-color: ${props => props.theme.red};
    }
  `};

  ${isOr('disabled', 'loading')`
    cursor: not-allowed;
    pointer-events: none;
    color: ${props => props.theme.grey};
    background-color: ${props => props.theme.disabled};
    border-color: ${props => props.theme.grey};

    &:focus {
      background-color: ${props => props.theme.disabled};
      border-color: ${props => props.theme.grey};
    }

    &:hover {
      background-color: ${props => props.theme.disabled};
      border-color: ${props => props.theme.disabled};
    }

    &:active,
    &:active:hover,
    &:active:focus {
      background-color: ${props => props.theme.disabled};
      border-color: ${props => props.theme.disabled};
    }
  `};

  ${is('rect')`
    border-radius: 0;
  `};

  ${is('small')`
    padding: ${remcalc(9)} ${remcalc(18)};
    font-size: ${remcalc(13)};
    min-width: ${remcalc(0)};
  `};

  ${is('icon')`
    display: inline-flex;
    align-items: center;
    min-width: ${remcalc(0)};


    & svg + span {
      margin-left: ${remcalc(12)};
    }

    & svg {
      max-height: ${remcalc(18)};
    }
  `};

  ${is('fluid')`
    width: 100%;
    max-width: 100%;
  `};

  ${is('marginless')`
    margin: 0;
  `};

  ${is('bold')`
    font-weight: 500;
  `};

  ${is('right')`
    float: right;
  `};
`;

const StyledButton = NButton.extend`
  min-width: ${remcalc(120)};

  ${style} & + button {
    margin-left: ${remcalc(6)};
  }
`;

const StyledAnchor = A.extend`
  display: inline-block;
  ${style};
`;

const StyledLink = styled(Link)`
  display: inline-block;
  ${style};
`;

/**
 * Buttons are the core of any UI kit, and we are no exception. Here we have documented to most basic variations of the button states, which include but are limited to; Default, Hover, Clicked, and Disabled.
 */
const Button = props => {
  const { href = '', to = '', loading = false, secondary } = props;

  const Views = [
    () => (to ? StyledLink : null),
    () => (href ? StyledAnchor : null),
    () => StyledButton
  ];

  const View = Views.reduce((sel, view) => (sel ? sel : view()), null);

  const children = loading ? (
    <StatusLoader secondary={!secondary} small />
  ) : (
    props.children
  );

  return <View {...props}>{children}</View>;
};

Button.propTypes = {
  /**
   * The `<button>`/`<a>`/`<Link>` text
   */
  children: PropTypes.node,
  /**
   * When used, it will render an `<a>` with the given href
   */
  href: PropTypes.string,
  /**
   * When used, it will render a `<Link>` with the given to
   */
  to: PropTypes.string,
  /**
   * Is it primary ?
   */
  primary: PropTypes.bool,
  /**
   * Is it secondary ?
   */
  secondary: PropTypes.bool,
  /**
   * When set to true a smaller version of the button will show
   */
  small: PropTypes.bool,
  /**
   * Set to true to show loading animation
   */
  loading: PropTypes.bool
};

Button.defaultProps = {
  primary: true,
  secondary: false,
  small: false,
  loading: false
};

export default Baseline(Button);