feat(client): add compare selection mode to page history list

apps/client/public/locales/en-US/translation.json

@@ -1289,5 +1289,9 @@
   "{{count}} rows deleted_one": "1 row deleted",
   "{{count}} rows deleted_other": "{{count}} rows deleted",
   "{{count}} selected_one": "1 selected",
-  "{{count}} selected_other": "{{count}} selected"
+  "{{count}} selected_other": "{{count}} selected",
+  "Compare": "Compare",
+  "Compare versions": "Compare versions",
+  "Select version from {{date}}": "Select version from {{date}}",
+  "Version actions for {{date}}": "Version actions for {{date}}"
 }

apps/client/src/features/page-history/components/css/history.module.css

@@ -1,7 +1,7 @@
 .history {
-  display: block;
+  display: flex;
+  align-items: center;
   width: 100%;
-  padding: var(--mantine-spacing-md);
   color: light-dark(var(--mantine-color-black), var(--mantine-color-dark-0));
 
   @mixin hover {
@@ -12,6 +12,28 @@
   }
 }
 
+.historyButton {
+  flex: 1;
+  min-width: 0;
+  color: inherit;
+}
+
+.compareCheckbox {
+  padding-left: var(--mantine-spacing-xs);
+}
+
+.itemMenu {
+  opacity: 0;
+  margin-right: var(--mantine-spacing-xs);
+}
+
+.history:hover .itemMenu,
+.history:focus-within .itemMenu,
+.history.active .itemMenu,
+.itemMenu[aria-expanded="true"] {
+  opacity: 1;
+}
+
 .historyEditor {
   :global(.ProseMirror) {
     padding: 0 !important;

apps/client/src/features/page-history/components/history-item.tsx

@@ -1,10 +1,21 @@
-import { Text, Group, UnstyledButton, Avatar, Tooltip } from "@mantine/core";
+import {
+  Text,
+  Group,
+  UnstyledButton,
+  Avatar,
+  Tooltip,
+  ActionIcon,
+  Checkbox,
+  Menu,
+} from "@mantine/core";
+import { IconDots } from "@tabler/icons-react";
 import { CustomAvatar } from "@/components/ui/custom-avatar.tsx";
 import { formattedDate } from "@/lib/time";
 import classes from "./css/history.module.css";
 import clsx from "clsx";
 import { IPageHistory } from "@/features/page-history/types/page.types";
 import { memo, useCallback } from "react";
+import { useTranslation } from "react-i18next";
 
 const MAX_VISIBLE_AVATARS = 5;
 
@@ -15,6 +26,13 @@ interface HistoryItemProps {
   onHover?: (id: string, index: number) => void;
   onHoverEnd?: () => void;
   isActive: boolean;
+  compareMode: boolean;
+  isChecked: boolean;
+  isCheckboxDisabled: boolean;
+  canCompare: boolean;
+  onToggleCompare: (id: string) => void;
+  onStartCompare: (id: string) => void;
+  onRestore?: (id: string, index: number) => void;
 }
 
 const HistoryItem = memo(function HistoryItem({
@@ -24,10 +42,24 @@ const HistoryItem = memo(function HistoryItem({
   onHover,
   onHoverEnd,
   isActive,
+  compareMode,
+  isChecked,
+  isCheckboxDisabled,
+  canCompare,
+  onToggleCompare,
+  onStartCompare,
+  onRestore,
 }: HistoryItemProps) {
+  const { t } = useTranslation();
+  const date = formattedDate(new Date(historyItem.createdAt));
+
   const handleClick = useCallback(() => {
+    if (compareMode) {
+      onToggleCompare(historyItem.id);
+    } else {
       onSelect(historyItem.id, index);
-  }, [onSelect, historyItem.id, index]);
+    }
+  }, [compareMode, onToggleCompare, onSelect, historyItem.id, index]);
 
   const handleMouseEnter = useCallback(() => {
     onHover?.(historyItem.id, index);
@@ -37,22 +69,42 @@ const HistoryItem = memo(function HistoryItem({
   const hasContributors = contributors && contributors.length > 0;
 
   return (
+    <div
+      className={clsx(classes.history, { [classes.active]: isActive })}
+      onMouseEnter={handleMouseEnter}
+      onMouseLeave={onHoverEnd}
+    >
+      {compareMode && (
+        <Checkbox
+          size="xs"
+          className={classes.compareCheckbox}
+          checked={isChecked}
+          disabled={isCheckboxDisabled}
+          onChange={() => onToggleCompare(historyItem.id)}
+          aria-label={t("Select version from {{date}}", { date })}
+        />
+      )}
+
       <UnstyledButton
         p="xs"
         onClick={handleClick}
-      onMouseEnter={handleMouseEnter}
+        className={classes.historyButton}
-      onMouseLeave={onHoverEnd}
-      className={clsx(classes.history, { [classes.active]: isActive })}
       >
-      <Text size="sm">{formattedDate(new Date(historyItem.createdAt))}</Text>
+        <Text size="sm">{date}</Text>
 
         <Group gap={6} wrap="nowrap" mt={4}>
           {hasContributors ? (
             <>
               <Tooltip.Group openDelay={300} closeDelay={100}>
                 <Avatar.Group spacing={8}>
-                {contributors.slice(0, MAX_VISIBLE_AVATARS).map((contributor) => (
+                  {contributors
-                  <Tooltip key={contributor.id} label={contributor.name} withArrow>
+                    .slice(0, MAX_VISIBLE_AVATARS)
+                    .map((contributor) => (
+                      <Tooltip
+                        key={contributor.id}
+                        label={contributor.name}
+                        withArrow
+                      >
                         <CustomAvatar
                           size="sm"
                           avatarUrl={contributor.avatarUrl}
@@ -63,7 +115,9 @@ const HistoryItem = memo(function HistoryItem({
                   {contributors.length > MAX_VISIBLE_AVATARS && (
                     <Tooltip
                       withArrow
-                    label={contributors.slice(MAX_VISIBLE_AVATARS).map((c) => (
+                      label={contributors
+                        .slice(MAX_VISIBLE_AVATARS)
+                        .map((c) => (
                           <div key={c.id}>{c.name}</div>
                         ))}
                     >
@@ -94,6 +148,36 @@ const HistoryItem = memo(function HistoryItem({
           )}
         </Group>
       </UnstyledButton>
+
+      {!compareMode && (
+        <Menu shadow="md" width={180} position="bottom-end">
+          <Menu.Target>
+            <ActionIcon
+              variant="subtle"
+              color="gray"
+              className={classes.itemMenu}
+              aria-label={t("Version actions for {{date}}", { date })}
+              onClick={(e) => e.stopPropagation()}
+            >
+              <IconDots size={18} />
+            </ActionIcon>
+          </Menu.Target>
+          <Menu.Dropdown>
+            <Menu.Item
+              disabled={!canCompare}
+              onClick={() => onStartCompare(historyItem.id)}
+            >
+              {t("Compare")}
+            </Menu.Item>
+            {onRestore && (
+              <Menu.Item onClick={() => onRestore(historyItem.id, index)}>
+                {t("Restore")}
+              </Menu.Item>
+            )}
+          </Menu.Dropdown>
+        </Menu>
+      )}
+    </div>
   );
 });
 

apps/client/src/features/page-history/components/history-list.tsx

@@ -6,8 +6,12 @@ import HistoryItem from "@/features/page-history/components/history-item";
 import {
   activeHistoryIdAtom,
   activeHistoryPrevIdAtom,
+  compareModeAtom,
+  comparePairAtom,
+  compareSelectionAtom,
   historyAtoms,
 } from "@/features/page-history/atoms/history-atoms";
+import { resolveComparePair } from "@/features/page-history/utils/resolve-compare-pair";
 import { useAtom, useSetAtom } from "jotai";
 import { useCallback, useEffect, useMemo, useRef } from "react";
 import {
@@ -32,6 +36,10 @@ function HistoryList({ pageId }: Props) {
   const [activeHistoryId, setActiveHistoryId] = useAtom(activeHistoryIdAtom);
   const setActiveHistoryPrevId = useSetAtom(activeHistoryPrevIdAtom);
   const setHistoryModalOpen = useSetAtom(historyAtoms);
+  const [compareMode, setCompareMode] = useAtom(compareModeAtom);
+  const [compareSelection, setCompareSelection] = useAtom(compareSelectionAtom);
+  // @ts-ignore
+  const setComparePair = useSetAtom(comparePairAtom);
 
   const {
     data: pageHistoryData,
@@ -79,10 +87,60 @@ function HistoryList({ pageId }: Props) {
 
   const handleSelect = useCallback(
     (id: string, index: number) => {
+      // @ts-ignore
+      setComparePair(null);
       setActiveHistoryId(id);
       setActiveHistoryPrevId(historyItems[index + 1]?.id ?? "");
     },
-    [historyItems, setActiveHistoryId, setActiveHistoryPrevId],
+    [historyItems, setActiveHistoryId, setActiveHistoryPrevId, setComparePair],
+  );
+
+  const handleToggleCompare = useCallback(
+    (id: string) => {
+      setCompareSelection((prev) => {
+        if (prev.includes(id)) return prev.filter((item) => item !== id);
+        if (prev.length >= 2) return prev;
+        return [...prev, id];
+      });
+    },
+    [setCompareSelection],
+  );
+
+  const handleStartCompare = useCallback(
+    (id: string) => {
+      // @ts-ignore
+      setComparePair(null);
+      setCompareMode(true);
+      setCompareSelection([id]);
+    },
+    [setComparePair, setCompareMode, setCompareSelection],
+  );
+
+  const handleCancelCompare = useCallback(() => {
+    setCompareMode(false);
+    setCompareSelection([]);
+  }, [setCompareMode, setCompareSelection]);
+
+  const handleConfirmCompare = useCallback(() => {
+    const pair = resolveComparePair(historyItems, compareSelection);
+    if (!pair) return;
+    setComparePair(pair);
+    setCompareMode(false);
+    setCompareSelection([]);
+  }, [
+    historyItems,
+    compareSelection,
+    setComparePair,
+    setCompareMode,
+    setCompareSelection,
+  ]);
+
+  const handleRestoreItem = useCallback(
+    (id: string, index: number) => {
+      handleSelect(id, index);
+      confirmRestore(id);
+    },
+    [handleSelect, confirmRestore],
   );
 
   useEffect(() => {
@@ -138,6 +196,16 @@ function HistoryList({ pageId }: Props) {
             onHover={handleHover}
             onHoverEnd={clearPrefetchTimeout}
             isActive={historyItem.id === activeHistoryId}
+            compareMode={compareMode}
+            isChecked={compareSelection.includes(historyItem.id)}
+            isCheckboxDisabled={
+              !compareSelection.includes(historyItem.id) &&
+              compareSelection.length >= 2
+            }
+            canCompare={historyItems.length >= 2}
+            onToggleCompare={handleToggleCompare}
+            onStartCompare={handleStartCompare}
+            onRestore={canRestore ? handleRestoreItem : undefined}
           />
         ))}
         {hasNextPage && <div ref={loadMoreRef} style={{ height: 1 }} />}
@@ -148,7 +216,28 @@ function HistoryList({ pageId }: Props) {
         )}
       </ScrollArea>
 
-      {canRestore && (
+      {compareMode ? (
+        <>
+          <Divider />
+          <Group p="xs" wrap="nowrap">
+            <Button
+              variant="default"
+              size="compact-md"
+              onClick={handleCancelCompare}
+            >
+              {t("Cancel")}
+            </Button>
+            <Button
+              size="compact-md"
+              disabled={compareSelection.length !== 2}
+              onClick={handleConfirmCompare}
+            >
+              {t("Compare versions")}
+            </Button>
+          </Group>
+        </>
+      ) : (
+        canRestore && (
           <>
             <Divider />
             <Group p="xs" wrap="nowrap">
@@ -164,6 +253,7 @@ function HistoryList({ pageId }: Props) {
               </Button>
             </Group>
           </>
+        )
       )}
     </div>
   );