// @flow
import type { Node } from 'react';
import React, { forwardRef, useRef } from 'react';
import Icon from 'component/common/icon';
import classnames from 'classnames';
import { NavLink } from 'react-router-dom';
import { formatLbryUrlForWeb } from 'util/url';
import useCombinedRefs from 'effects/use-combined-refs';

type Props = {
  id: ?string,
  href: ?string,
  title: ?string,
  label: ?string,
  largestLabel: ?string,
  icon: ?string,
  iconRight: ?string,
  disabled: ?boolean,
  children: ?Node,
  navigate: ?string,
  className: ?string,
  description: ?string,
  type: string,
  button: ?string, // primary, secondary, alt, link
  iconSize?: number,
  iconColor?: string,
  activeClass?: string,
  innerRef: ?any,
  authSrc?: string,
  // Events
  onClick: ?(any) => any,
  onMouseEnter: ?(any) => any,
  onMouseLeave: ?(any) => any,
  pathname: string,
  emailVerified: boolean,
  myref: any,
  dispatch: any,
  'aria-label'?: string,
  user: ?User,
};

// use forwardRef to allow consumers to pass refs to the button content if they want to
// flow requires forwardRef have default type arguments passed to it
const Button = forwardRef<any, {}>((props: Props, ref: any) => {
  const {
    type = 'button',
    onClick,
    href,
    title,
    label,
    largestLabel,
    icon,

    // This should rarely be used. Regular buttons should just use `icon`
    // `iconRight` is used for the header (home) button with the LBRY icon and external links that are displayed inline
    iconRight,
    disabled,
    children,
    navigate,
    className,
    description,
    button,
    iconSize,
    iconColor,
    activeClass,
    emailVerified,
    myref,
    dispatch, // <button> doesn't know what to do with dispatch
    pathname,
    user,
    authSrc,
    ...otherProps
  } = props;

  const disable = disabled;

  const combinedClassName = classnames(
    'button',
    button
      ? {
          'button--primary': button === 'primary',
          'button--secondary': button === 'secondary',
          'button--alt': button === 'alt',
          'button--inverse': button === 'inverse',
          'button--close': button === 'close',
          'button--disabled': disable,
          'button--link': button === 'link',
        }
      : 'button--no-style',
    className
  );

  const innerRef = useRef(null);
  const combinedRef = useCombinedRefs(ref, innerRef, myref);
  const size = iconSize || (!label && !children) ? 18 : undefined; // Fall back to default

  // Label can be a string or object ( use title instead )
  const ariaLabel = description || (typeof label === 'string' ? label : title);

  const content = (
    <span className="button__content">
      {icon && <Icon icon={icon} iconColor={iconColor} size={iconSize} />}

      {!largestLabel && label && (
        <span dir="auto" className="button__label">
          {label}
        </span>
      )}

      {/* largestLabel is used when a single button has two different labels based on hover state */}
      {largestLabel && (
        <div dir="auto" className="button__label" style={{ position: 'relative' }}>
          <div
            style={{
              position: 'relative',
              left: '50%',
              top: '50%',
              transform: `translate(-50%, 0%)`,
            }}
          >
            <span style={{ visibility: 'hidden' }}>
              {largestLabel || label}
              <div
                style={{
                  position: 'absolute',
                  left: '50%',
                  top: '50%',
                  transform: `translate(-50%, -50%)`,
                }}
              >
                <span style={{ visibility: 'visible' }}>{label}</span>
              </div>
            </span>
          </div>
        </div>
      )}

      {children && children}
      {iconRight && <Icon icon={iconRight} iconColor={iconColor} size={size} />}
    </span>
  );

  if (href || (navigate && navigate.startsWith('http'))) {
    // TODO: replace the below with an outbound link tracker for matomo
    return (
      <a
        target="_blank"
        rel="noopener noreferrer"
        href={href || navigate}
        className={combinedClassName}
        title={title}
        onClick={onClick}
        aria-label={ariaLabel}
        disabled={disabled} // is there a reason this wasn't here before?
      >
        {content}
      </a>
    );
  }

  // Handle lbry:// uris passed in, or already formatted web urls
  let path = navigate;
  if (path) {
    if (path.startsWith('lbry://')) {
      path = formatLbryUrlForWeb(path);
    } else if (!path.startsWith('/')) {
      // Force a leading slash so new paths aren't appended on to the current path
      path = `/${path}`;
    }
  }

  // Try to generate a tooltip using available text and display it through
  // the 'title' mechanism, but only if it isn't being used.
  let defaultTooltip;
  if (!title) {
    if (props['aria-label']) {
      defaultTooltip = props['aria-label'];
    } else if (description) {
      defaultTooltip = description;
    }
  }

  return path ? (
    <NavLink
      exact
      to={path}
      title={title || defaultTooltip}
      disabled={disable}
      onClick={(e) => {
        e.stopPropagation();
        if (onClick) {
          onClick();
        }
      }}
      className={combinedClassName}
      activeClassName={activeClass}
      aria-label={ariaLabel}
      {...otherProps}
    >
      {content}
    </NavLink>
  ) : (
    <button
      ref={combinedRef}
      title={title || defaultTooltip}
      aria-label={ariaLabel}
      className={combinedClassName}
      onClick={(e) => {
        if (onClick) {
          e.stopPropagation();
          onClick(e);
        }
      }}
      disabled={disable}
      type={type}
      {...otherProps}
    >
      {content}
    </button>
  );
});

export default Button;