// @flow
import * as React from 'react';
import { withRouter, type RouterHistory } from 'react-router-dom';
import { observable } from 'mobx';
import { observer } from 'mobx-react';
import { lighten } from 'polished';
import styled, { withTheme } from 'styled-components';
import RichMarkdownEditor from 'rich-markdown-editor';
import { uploadFile } from 'utils/uploadFile';
import isInternalUrl from 'utils/isInternalUrl';
import Tooltip from 'components/Tooltip';
import UiStore from 'stores/UiStore';
import embeds from '../../embeds';

const EMPTY_ARRAY = [];

type Props = {
  id: string,
  defaultValue?: string,
  readOnly?: boolean,
  grow?: boolean,
  disableEmbeds?: boolean,
  history: RouterHistory,
  forwardedRef: React.Ref<RichMarkdownEditor>,
  ui: UiStore,
};

@observer
class Editor extends React.Component<Props> {
  @observable redirectTo: ?string;

  onUploadImage = async (file: File) => {
    const result = await uploadFile(file, { documentId: this.props.id });
    return result.url;
  };

  onClickLink = (href: string) => {
    // on page hash
    if (href[0] === '#') {
      window.location.href = href;
      return;
    }

    if (isInternalUrl(href)) {
      // relative
      let navigateTo = href;

      // probably absolute
      if (href[0] !== '/') {
        try {
          const url = new URL(href);
          navigateTo = url.pathname + url.hash;
        } catch (err) {
          navigateTo = href;
        }
      }

      this.props.history.push(navigateTo);
    } else {
      window.open(href, '_blank');
    }
  };

  onShowToast = (message: string) => {
    this.props.ui.showToast(message);
  };

  render() {
    return (
      <StyledEditor
        ref={this.props.forwardedRef}
        uploadImage={this.onUploadImage}
        onClickLink={this.onClickLink}
        onShowToast={this.onShowToast}
        embeds={this.props.disableEmbeds ? EMPTY_ARRAY : embeds}
        tooltip={EditorTooltip}
        {...this.props}
      />
    );
  }
}

const StyledEditor = styled(RichMarkdownEditor)`
  flex-grow: ${props => (props.grow ? 1 : 0)};
  justify-content: start;

  > div {
    transition: ${props => props.theme.backgroundTransition};
  }

  p {
    a {
      color: ${props => props.theme.link};
      border-bottom: 1px solid ${props => lighten(0.5, props.theme.link)};
      font-weight: 500;

      &:hover {
        border-bottom: 1px solid ${props => props.theme.link};
        text-decoration: none;
      }
    }
  }
`;

const EditorTooltip = ({ children, ...props }) => (
  <Tooltip offset="0, 16" delay={150} {...props}>
    <span>{children}</span>
  </Tooltip>
);

const EditorWithRouterAndTheme = withRouter(withTheme(Editor));

// $FlowIssue - https://github.com/facebook/flow/issues/6103
export default React.forwardRef((props, ref) => (
  <EditorWithRouterAndTheme {...props} forwardedRef={ref} />
));