feat: Improved viewers popover (#2106)

* refactoring popover

* feat: DocumentViews popover

* i18n

* fix: tab focus warnings

* test: Add tests around users.info changes

* snapshots

app/components/DocumentViews.js

@@ -0,0 +1,82 @@
+// @flow
+import distanceInWordsToNow from "date-fns/distance_in_words_to_now";
+import { sortBy } from "lodash";
+import { observer } from "mobx-react";
+import * as React from "react";
+import { useTranslation } from "react-i18next";
+import Document from "models/Document";
+import Avatar from "components/Avatar";
+import ListItem from "components/List/Item";
+import PaginatedList from "components/PaginatedList";
+import useStores from "hooks/useStores";
+
+type Props = {|
+  document: Document,
+  isOpen?: boolean,
+|};
+
+function DocumentViews({ document, isOpen }: Props) {
+  const { t } = useTranslation();
+  const { views, presence } = useStores();
+
+  React.useEffect(() => {
+    views.fetchPage({ documentId: document.id });
+  }, [views, document.id]);
+
+  let documentPresence = presence.get(document.id);
+  documentPresence = documentPresence
+    ? Array.from(documentPresence.values())
+    : [];
+
+  const presentIds = documentPresence.map((p) => p.userId);
+  const editingIds = documentPresence
+    .filter((p) => p.isEditing)
+    .map((p) => p.userId);
+
+  // ensure currently present via websocket are always ordered first
+  const documentViews = views.inDocument(document.id);
+  const sortedViews = sortBy(documentViews, (view) =>
+    presentIds.includes(view.user.id)
+  );
+
+  const users = React.useMemo(() => sortedViews.map((v) => v.user), [
+    sortedViews,
+  ]);
+
+  return (
+    <>
+      {isOpen && (
+        <PaginatedList
+          items={users}
+          renderItem={(item) => {
+            const view = documentViews.find((v) => v.user.id === item.id);
+            const isPresent = presentIds.includes(item.id);
+            const isEditing = editingIds.includes(item.id);
+
+            const subtitle = isPresent
+              ? isEditing
+                ? t("Currently editing")
+                : t("Currently viewing")
+              : t("Viewed {{ timeAgo }} ago", {
+                  timeAgo: distanceInWordsToNow(
+                    view ? new Date(view.lastViewedAt) : new Date()
+                  ),
+                });
+
+            return (
+              <ListItem
+                key={item.id}
+                title={item.name}
+                subtitle={subtitle}
+                image={<Avatar key={item.id} src={item.avatarUrl} size={32} />}
+                border={false}
+              />
+            );
+          }}
+        />
+      )}
+    </>
+  );
+}
+
+export default observer(DocumentViews);