cinny/src/app/components/event-readers/EventReaders.tsx

import React from 'react';
import classNames from 'classnames';
import {
  Avatar,
  Box,
  Header,
  Icon,
  IconButton,
  Icons,
  MenuItem,
  Scroll,
  Text,
  as,
  config,
} from 'folds';
import { Room } from 'matrix-js-sdk';
import { useRoomEventReaders } from '../../hooks/useRoomEventReaders';
import { getMemberDisplayName } from '../../utils/room';
import { getMxIdLocalPart, mxcUrlToHttp } from '../../utils/matrix';
import * as css from './EventReaders.css';
import { useMatrixClient } from '../../hooks/useMatrixClient';
import { UserAvatar } from '../user-avatar';
import { useMediaAuthentication } from '../../hooks/useMediaAuthentication';
import { useOpenUserRoomProfile } from '../../state/hooks/userRoomProfile';
import { useSpaceOptionally } from '../../hooks/useSpace';
import { getMouseEventCords } from '../../utils/dom';
import { useSetting } from '../../state/hooks/settings';
import { settingsAtom } from '../../state/settings';
import { today, yesterday, timeHourMinute, timeMon, timeDay, timeYear } from '../../utils/time';

function formatReadTs(ts: number, hour24Clock: boolean): string {
  const timeStr = timeHourMinute(ts, hour24Clock);
  if (today(ts)) return `Today at ${timeStr}`;
  if (yesterday(ts)) return `Yesterday at ${timeStr}`;
  const sameYear = timeYear(ts) === timeYear(Date.now());
  return sameYear
    ? `${timeMon(ts)} ${timeDay(ts)} at ${timeStr}`
    : `${timeMon(ts)} ${timeDay(ts)} ${timeYear(ts)} at ${timeStr}`;
}

export type EventReadersProps = {
  room: Room;
  eventId: string;
  requestClose: () => void;
};
export const EventReaders = as<'div', EventReadersProps>(
  ({ className, room, eventId, requestClose, ...props }, ref) => {
    const mx = useMatrixClient();
    const useAuthentication = useMediaAuthentication();
    const myUserId = mx.getUserId();
    const latestEventReaders = useRoomEventReaders(room, eventId).filter((id) => id !== myUserId);
    const openProfile = useOpenUserRoomProfile();
    const space = useSpaceOptionally();
    const [hour24Clock] = useSetting(settingsAtom, 'hour24Clock');
    const [lotusTerminal] = useSetting(settingsAtom, 'lotusTerminal');

    const getName = (userId: string) =>
      getMemberDisplayName(room, userId) ?? getMxIdLocalPart(userId) ?? userId;

    return (
      <Box
        className={classNames(css.EventReaders, className)}
        direction="Column"
        {...props}
        ref={ref}
      >
        <Header
          className={css.Header}
          variant="Surface"
          size="500"
          style={
            lotusTerminal
              ? {
                  borderBottomWidth: config.borderWidth.B300,
                  boxShadow: 'var(--lt-box-glow-cyan)',
                }
              : undefined
          }
        >
          <Box grow="Yes">
            <Text
              size="H3"
              style={
                lotusTerminal
                  ? {
                      color: 'var(--lt-accent-cyan)',
                      textShadow: 'var(--lt-glow-cyan)',
                      letterSpacing: '0.05em',
                    }
                  : undefined
              }
            >
              Seen by
            </Text>
          </Box>
          <IconButton size="300" radii="300" onClick={requestClose} aria-label="Close">
            <Icon src={Icons.Cross} />
          </IconButton>
        </Header>
        <Box grow="Yes">
          <Scroll visibility="Hover" hideTrack size="300">
            <Box className={css.Content} direction="Column">
              {latestEventReaders.map((readerId) => {
                const name = getName(readerId);
                const avatarMxcUrl = room.getMember(readerId)?.getMxcAvatarUrl();
                const avatarUrl = avatarMxcUrl
                  ? (mxcUrlToHttp(mx, avatarMxcUrl, useAuthentication, 100, 100, 'crop') ??
                    undefined)
                  : undefined;
                const receiptTs = room.getReadReceiptForUserId(readerId)?.data.ts;

                return (
                  <MenuItem
                    key={readerId}
                    style={{ padding: `0 ${config.space.S200}` }}
                    radii="400"
                    onClick={(event) => {
                      openProfile(
                        room.roomId,
                        space?.roomId,
                        readerId,
                        getMouseEventCords(event.nativeEvent),
                        'Bottom',
                      );
                    }}
                    before={
                      <Avatar size="200">
                        <UserAvatar
                          userId={readerId}
                          src={avatarUrl}
                          alt={name}
                          renderFallback={() => <Icon size="50" src={Icons.User} filled />}
                        />
                      </Avatar>
                    }
                  >
                    <Box direction="Column" grow="Yes">
                      <Text size="T400" truncate>
                        {name}
                      </Text>
                      {receiptTs !== undefined && (
                        <Text
                          size="T200"
                          priority="300"
                          style={
                            lotusTerminal
                              ? {
                                  color: 'var(--lt-accent-amber)',
                                  textShadow: 'var(--lt-glow-amber)',
                                }
                              : undefined
                          }
                        >
                          {formatReadTs(receiptTs, hour24Clock)}
                        </Text>
                      )}
                    </Box>
                  </MenuItem>
                );
              })}
            </Box>
          </Scroll>
        </Box>
      </Box>
    );
  },
);