Extract Search handling from RoomView into its own Component (#9574)

* Extract Search handling from RoomView into its own Component

* Iterate

* Fix types

* Add tests

* Increase coverage

* Simplify test

* Improve coverage

src/components/structures/RoomSearchView.tsx

@@ -0,0 +1,258 @@
+/*
+Copyright 2015 - 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React, { forwardRef, RefObject, useCallback, useContext, useEffect, useRef, useState } from 'react';
+import { ISearchResults } from 'matrix-js-sdk/src/@types/search';
+import { IThreadBundledRelationship } from 'matrix-js-sdk/src/models/event';
+import { THREAD_RELATION_TYPE } from 'matrix-js-sdk/src/models/thread';
+import { logger } from "matrix-js-sdk/src/logger";
+
+import ScrollPanel from "./ScrollPanel";
+import { SearchScope } from "../views/rooms/SearchBar";
+import Spinner from "../views/elements/Spinner";
+import { _t } from "../../languageHandler";
+import { haveRendererForEvent } from "../../events/EventTileFactory";
+import SearchResultTile from "../views/rooms/SearchResultTile";
+import { searchPagination } from "../../Searching";
+import Modal from "../../Modal";
+import ErrorDialog from "../views/dialogs/ErrorDialog";
+import ResizeNotifier from "../../utils/ResizeNotifier";
+import MatrixClientContext from "../../contexts/MatrixClientContext";
+import { RoomPermalinkCreator } from "../../utils/permalinks/Permalinks";
+import RoomContext from "../../contexts/RoomContext";
+
+const DEBUG = false;
+let debuglog = function(msg: string) {};
+
+/* istanbul ignore next */
+if (DEBUG) {
+    // using bind means that we get to keep useful line numbers in the console
+    debuglog = logger.log.bind(console);
+}
+
+interface Props {
+    term: string;
+    scope: SearchScope;
+    promise: Promise<ISearchResults>;
+    abortController?: AbortController;
+    resizeNotifier: ResizeNotifier;
+    permalinkCreator: RoomPermalinkCreator;
+    className: string;
+    onUpdate(inProgress: boolean, results: ISearchResults | null): void;
+}
+
+// XXX: todo: merge overlapping results somehow?
+// XXX: why doesn't searching on name work?
+export const RoomSearchView = forwardRef<ScrollPanel, Props>(({
+    term,
+    scope,
+    promise,
+    abortController,
+    resizeNotifier,
+    permalinkCreator,
+    className,
+    onUpdate,
+}: Props, ref: RefObject<ScrollPanel>) => {
+    const client = useContext(MatrixClientContext);
+    const roomContext = useContext(RoomContext);
+    const [inProgress, setInProgress] = useState(true);
+    const [highlights, setHighlights] = useState<string[] | null>(null);
+    const [results, setResults] = useState<ISearchResults | null>(null);
+    const aborted = useRef(false);
+
+    const handleSearchResult = useCallback((searchPromise: Promise<ISearchResults>): Promise<boolean> => {
+        setInProgress(true);
+
+        return searchPromise.then(async (results) => {
+            debuglog("search complete");
+            if (aborted.current) {
+                logger.error("Discarding stale search results");
+                return false;
+            }
+
+            // postgres on synapse returns us precise details of the strings
+            // which actually got matched for highlighting.
+            //
+            // In either case, we want to highlight the literal search term
+            // whether it was used by the search engine or not.
+
+            let highlights = results.highlights;
+            if (!highlights.includes(term)) {
+                highlights = highlights.concat(term);
+            }
+
+            // For overlapping highlights,
+            // favour longer (more specific) terms first
+            highlights = highlights.sort(function(a, b) {
+                return b.length - a.length;
+            });
+
+            if (client.supportsExperimentalThreads()) {
+                // Process all thread roots returned in this batch of search results
+                // XXX: This won't work for results coming from Seshat which won't include the bundled relationship
+                for (const result of results.results) {
+                    for (const event of result.context.getTimeline()) {
+                        const bundledRelationship = event
+                            .getServerAggregatedRelation<IThreadBundledRelationship>(THREAD_RELATION_TYPE.name);
+                        if (!bundledRelationship || event.getThread()) continue;
+                        const room = client.getRoom(event.getRoomId());
+                        const thread = room.findThreadForEvent(event);
+                        if (thread) {
+                            event.setThread(thread);
+                        } else {
+                            room.createThread(event.getId(), event, [], true);
+                        }
+                    }
+                }
+            }
+
+            setHighlights(highlights);
+            setResults({ ...results }); // copy to force a refresh
+        }, (error) => {
+            if (aborted.current) {
+                logger.error("Discarding stale search results");
+                return false;
+            }
+            logger.error("Search failed", error);
+            Modal.createDialog(ErrorDialog, {
+                title: _t("Search failed"),
+                description: error?.message
+                    ?? _t("Server may be unavailable, overloaded, or search timed out :("),
+            });
+            return false;
+        }).finally(() => {
+            setInProgress(false);
+        });
+    }, [client, term]);
+
+    // Mount & unmount effect
+    useEffect(() => {
+        aborted.current = false;
+        handleSearchResult(promise);
+        return () => {
+            aborted.current = true;
+            abortController?.abort();
+        };
+    }, []); // eslint-disable-line react-hooks/exhaustive-deps
+
+    // show searching spinner
+    if (results?.count === undefined) {
+        return (
+            <div
+                className="mx_RoomView_messagePanel mx_RoomView_messagePanelSearchSpinner"
+                data-testid="messagePanelSearchSpinner"
+            />
+        );
+    }
+
+    const onSearchResultsFillRequest = async (backwards: boolean): Promise<boolean> => {
+        if (!backwards) {
+            return false;
+        }
+
+        if (!results.next_batch) {
+            debuglog("no more search results");
+            return false;
+        }
+
+        debuglog("requesting more search results");
+        const searchPromise = searchPagination(results);
+        return handleSearchResult(searchPromise);
+    };
+
+    const ret: JSX.Element[] = [];
+
+    if (inProgress) {
+        ret.push(<li key="search-spinner">
+            <Spinner />
+        </li>);
+    }
+
+    if (!results.next_batch) {
+        if (!results?.results?.length) {
+            ret.push(<li key="search-top-marker">
+                <h2 className="mx_RoomView_topMarker">{ _t("No results") }</h2>
+            </li>);
+        } else {
+            ret.push(<li key="search-top-marker">
+                <h2 className="mx_RoomView_topMarker">{ _t("No more results") }</h2>
+            </li>);
+        }
+    }
+
+    // once dynamic content in the search results load, make the scrollPanel check
+    // the scroll offsets.
+    const onHeightChanged = () => {
+        const scrollPanel = ref.current;
+        scrollPanel?.checkScroll();
+    };
+
+    let lastRoomId: string;
+
+    for (let i = (results?.results?.length || 0) - 1; i >= 0; i--) {
+        const result = results.results[i];
+
+        const mxEv = result.context.getEvent();
+        const roomId = mxEv.getRoomId();
+        const room = client.getRoom(roomId);
+        if (!room) {
+            // if we do not have the room in js-sdk stores then hide it as we cannot easily show it
+            // As per the spec, an all rooms search can create this condition,
+            // it happens with Seshat but not Synapse.
+            // It will make the result count not match the displayed count.
+            logger.log("Hiding search result from an unknown room", roomId);
+            continue;
+        }
+
+        if (!haveRendererForEvent(mxEv, roomContext.showHiddenEvents)) {
+            // XXX: can this ever happen? It will make the result count
+            // not match the displayed count.
+            continue;
+        }
+
+        if (scope === SearchScope.All) {
+            if (roomId !== lastRoomId) {
+                ret.push(<li key={mxEv.getId() + "-room"}>
+                    <h2>{ _t("Room") }: { room.name }</h2>
+                </li>);
+                lastRoomId = roomId;
+            }
+        }
+
+        const resultLink = "#/room/"+roomId+"/"+mxEv.getId();
+
+        ret.push(<SearchResultTile
+            key={mxEv.getId()}
+            searchResult={result}
+            searchHighlights={highlights}
+            resultLink={resultLink}
+            permalinkCreator={permalinkCreator}
+            onHeightChanged={onHeightChanged}
+        />);
+    }
+
+    return (
+        <ScrollPanel
+            ref={ref}
+            className={"mx_RoomView_searchResultsPanel " + className}
+            onFillRequest={onSearchResultsFillRequest}
+            resizeNotifier={resizeNotifier}
+        >
+            <li className="mx_RoomView_scrollheader" />
+            { ret }
+        </ScrollPanel>
+    );
+});