// @flow
import * as React from "react";
import { observer, inject } from "mobx-react";
import styled, { withTheme } from "styled-components";
import Flex from "components/Flex";
import Avatar from "components/Avatar";
import User from "models/User";

type Props = {
  users: User[],
  size?: number,
  overflow: number,
  renderAvatar: (user: User) => React.Node,
};

@observer
class Facepile extends React.Component<Props> {
  render() {
    const {
      users,
      overflow,
      size = 32,
      renderAvatar = renderDefaultAvatar,
      ...rest
    } = this.props;

    return (
      <Avatars {...rest}>
        {overflow > 0 && (
          <More size={size}>
            <span>+{overflow}</span>
          </More>
        )}
        {users.map(user => (
          <AvatarWrapper key={user.id}>{renderAvatar(user)}</AvatarWrapper>
        ))}
      </Avatars>
    );
  }
}

function renderDefaultAvatar(user: User) {
  return <Avatar user={user} src={user.avatarUrl} size={32} />;
}

const AvatarWrapper = styled.div`
  margin-right: -8px;

  &:first-child {
    margin-right: 0;
  }
`;

const More = styled.div`
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: ${props => props.size}px;
  height: ${props => props.size}px;
  border-radius: 100%;
  background: ${props => props.theme.slate};
  color: ${props => props.theme.text};
  border: 2px solid ${props => props.theme.background};
  text-align: center;
  font-size: 11px;
  font-weight: 600;
`;

const Avatars = styled(Flex)`
  align-items: center;
  flex-direction: row-reverse;
  cursor: pointer;
`;

export default inject("views", "presence")(withTheme(Facepile));