Infinite piece query

packages/frontend/src/routes/Pieces.tsx

@@ -14,32 +14,27 @@ import clsx from "clsx";
 import { PieceId, Updater } from "common";
 import * as Body from "common/Body";
 import { getMediaTypeForFilename } from "common/MediaType";
-import { Array, Cause, Effect, Fiber, Iterable, Match, Option, Order, pipe, Predicate, Scope, SortedMap } from "effect";
-import { Import, Loader2, Plus } from "lucide-react";
-import { DragEventHandler, FormEventHandler, useId, useRef, useState } from "react";
+import { Array, Effect, Fiber, Iterable, Match, Option, Order, pipe, Predicate, Scope, SortedMap } from "effect";
+import { Import, Loader2, Plus, RefreshCwIcon } from "lucide-react";
+import { DragEventHandler, FormEventHandler, RefObject, useCallback, useId, useImperativeHandle, useRef, useState } from "react";
 import { Link, useNavigate } from "react-router-dom";
 
+const LIMIT = 100;
+
 export function Pieces() {
 
 	const name = useStore(state => state.pieceQueryName);
 	const author = useStore(state => state.pieceQueryAuthor);
 
 	const [importDialogOpen, setImportDialogOpen] = useState(false);
+	const [refresh, setRefresh] = useState(Effect.void);
 
 	const debounce = useRef(Effect.void);
 	const breakpoint = useBreakpoint();
-	const columns = breakpoint ? 4 : 1;
 
-	const { isLoading, error, data: pieceIds, refresh } = useLoading(Effect.gen(function* () {
-		yield* debounce.current;
-		const data = yield* client.queryPieces({
-			name: name !== "" ? Option.some(name) : Option.none(),
-			author: author !== "" ? Option.some(author) : Option.none(),
-			offset: 0,
-			limit: 100,
-		});
-		return data;
-	}), [name, author]);
+	const queryRef = useCallback((ref: Query.Ref | null) => {
+		setRefresh(ref !== null ? ref.refresh : Effect.void);
+	}, []);
 
 	return (
 		<div className="p-4 overflow-y-auto flex flex-col gap-4">
@@ -93,30 +88,98 @@ export function Pieces() {
 					</TableHeader>
 				)}
 				<TableBody>
-					{isLoading ? (
-						<TableRow>
-							<TableCell colSpan={columns} >
-								<div className="flex items-center justify-center gap-2">
-									<Loader2 className="animate-spin" />
-									Ładowanie…
-								</div>
-							</TableCell>
-						</TableRow>
-					) : error !== null ? (
-						<TableRow>
-							<TableCell colSpan={columns} className="text-center">
-								{Cause.isUnknownException(error) ? "Wystąpił nieznany błąd" : `Wystąpił błąd: ${JSON.stringify(error)}`}
-							</TableCell>
-						</TableRow>
-					) : (
-						pieceIds.map((pieceId) => <PieceRow key={pieceId} pieceId={pieceId} />)
-					)}
+					<Query
+						ref={queryRef}
+						offset={0}
+						debounce={debounce}
+					/>
 				</TableBody>
 			</Table>
 		</div>
 	);
 }
 
+namespace Query {
+	export interface Props {
+		readonly offset: number;
+		readonly debounce?: RefObject<Effect.Effect<void>> | undefined;
+		readonly ref?: React.Ref<Ref> | undefined;
+	}
+
+	export interface Ref {
+		readonly refresh: Effect.Effect<void>;
+	}
+}
+
+function Query({
+	offset,
+	debounce,
+	ref,
+}: Query.Props) {
+
+	const name = useStore(state => state.pieceQueryName);
+	const author = useStore(state => state.pieceQueryAuthor);
+
+	const breakpoint = useBreakpoint();
+	const columns = breakpoint ? 4 : 1;
+
+	const [continuationOpen, setContinuationOpen] = useState(false);
+
+	const { isLoading, error, data: pieceIds, refresh } = useLoading(Effect.gen(function* () {
+		setContinuationOpen(false);
+		if (debounce !== undefined) {
+			yield* debounce.current;
+		}
+
+		const data = yield* client.queryPieces({
+			name: name !== "" ? Option.some(name) : Option.none(),
+			author: author !== "" ? Option.some(author) : Option.none(),
+			offset,
+			limit: LIMIT,
+		});
+		return data;
+	}), [name, author, offset]);
+
+	useImperativeHandle(ref, () => Object.freeze<Query.Ref>({
+		refresh,
+	}), [refresh]);
+
+	return isLoading ? (
+		<TableRow>
+			<TableCell colSpan={columns} >
+				<div className="flex items-center justify-center gap-2">
+					<Loader2 className="animate-spin" />
+					Ładowanie…
+				</div>
+			</TableCell>
+		</TableRow>
+	) : error !== null ? (
+		<TableRow>
+			<TableCell colSpan={columns} className="text-center">
+				Wystąpił błąd: {Match.value(error).pipe(
+					Match.tag("FetchError", () => "Nie można połączyć się z serwerem"),
+					Match.tag("Unauthenticated", () => "Zaloguj się, aby kontynuować"),
+					Match.tag("Unauthorized", () => "Nie posiadasz uprawnień"),
+					Match.exhaustive,
+				)}
+			</TableCell>
+		</TableRow>
+	) : (<>
+		{pieceIds.map((pieceId) => <PieceRow key={pieceId} pieceId={pieceId} />)}
+		{continuationOpen ? (
+			<Query offset={offset + LIMIT} />
+		) : pieceIds.length >= LIMIT ? (
+			<TableRow>
+				<TableCell colSpan={columns} className="text-center">
+					<Button variant="outline" onClick={() => setContinuationOpen(true)}>
+						<RefreshCwIcon/>Załaduj więcej
+					</Button>
+				</TableCell>
+			</TableRow>
+		) : null}
+	</>);
+}
+
 namespace PieceRow {
 	export interface Props {
 		readonly pieceId: PieceId;