add popover to show what fields will be saved

web/public/locales/en/views/settings.json

@@ -91,6 +91,23 @@
       "desc": "Do you want to save your changes before continuing?"
     }
   },
+  "saveAllPreview": {
+    "title": "Changes to be saved",
+    "triggerLabel": "Review pending changes",
+    "empty": "No pending changes.",
+    "scope": {
+      "label": "Scope",
+      "global": "Global",
+      "camera": "Camera: {{cameraName}}"
+    },
+    "field": {
+      "label": "Field"
+    },
+    "value": {
+      "label": "New value",
+      "reset": "Reset"
+    }
+  },
   "cameraSetting": {
     "camera": "Camera",
     "noCamera": "No Camera"

web/src/components/overlay/detail/SaveAllPreviewPopover.tsx

@@ -0,0 +1,142 @@
+import { useCallback, useState } from "react";
+import { useTranslation } from "react-i18next";
+import { LuInfo, LuX } from "react-icons/lu";
+import {
+  Popover,
+  PopoverContent,
+  PopoverTrigger,
+} from "@/components/ui/popover";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+export type SaveAllPreviewItem = {
+  scope: "global" | "camera";
+  cameraName?: string;
+  fieldPath: string;
+  value: unknown;
+};
+
+type SaveAllPreviewPopoverProps = {
+  items: SaveAllPreviewItem[];
+  className?: string;
+  align?: "start" | "center" | "end";
+  side?: "top" | "bottom" | "left" | "right";
+};
+
+export default function SaveAllPreviewPopover({
+  items,
+  className,
+  align = "end",
+  side = "bottom",
+}: SaveAllPreviewPopoverProps) {
+  const { t } = useTranslation(["views/settings", "common"]);
+  const [open, setOpen] = useState(false);
+  const resetLabel = t("saveAllPreview.value.reset", {
+    ns: "views/settings",
+  });
+
+  const formatValue = useCallback(
+    (value: unknown) => {
+      if (value === "") return resetLabel;
+      if (typeof value === "string") return value;
+      try {
+        return JSON.stringify(value, null, 2);
+      } catch {
+        return String(value);
+      }
+    },
+    [resetLabel],
+  );
+
+  return (
+    <Popover open={open} onOpenChange={setOpen}>
+      <PopoverTrigger asChild>
+        <Button
+          type="button"
+          variant="ghost"
+          size="icon"
+          className={cn("size-8", className)}
+          aria-label={t("saveAllPreview.triggerLabel", {
+            ns: "views/settings",
+          })}
+        >
+          <LuInfo className="size-4" />
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent
+        align={align}
+        side={side}
+        className="w-[90vw] max-w-sm border bg-background p-4 shadow-lg"
+        onOpenAutoFocus={(event) => event.preventDefault()}
+      >
+        <div className="flex items-center justify-between gap-2">
+          <div className="text-sm font-semibold text-primary-variant">
+            {t("saveAllPreview.title", { ns: "views/settings" })}
+          </div>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="size-7"
+            onClick={() => setOpen(false)}
+            aria-label={t("button.close", { ns: "common" })}
+          >
+            <LuX className="size-4" />
+          </Button>
+        </div>
+        {items.length === 0 ? (
+          <div className="mt-3 text-xs text-muted-foreground">
+            {t("saveAllPreview.empty", { ns: "views/settings" })}
+          </div>
+        ) : (
+          <div className="scrollbar-container mt-3 flex max-h-72 flex-col gap-2 overflow-y-auto pr-1">
+            {items.map((item) => {
+              const scopeLabel =
+                item.scope === "global"
+                  ? t("saveAllPreview.scope.global", {
+                      ns: "views/settings",
+                    })
+                  : t("saveAllPreview.scope.camera", {
+                      ns: "views/settings",
+                      cameraName: item.cameraName,
+                    });
+              return (
+                <div
+                  key={`${item.scope}-${item.cameraName ?? "global"}-${
+                    item.fieldPath
+                  }`}
+                  className="rounded-md border border-secondary bg-background_alt p-2"
+                >
+                  <div className="grid grid-cols-[auto_1fr] gap-x-3 gap-y-1 text-xs">
+                    <span className="text-muted-foreground">
+                      {t("saveAllPreview.scope.label", {
+                        ns: "views/settings",
+                      })}
+                    </span>
+                    <span className="truncate">{scopeLabel}</span>
+                    <span className="text-muted-foreground">
+                      {t("saveAllPreview.field.label", {
+                        ns: "views/settings",
+                      })}
+                    </span>
+                    <span className="font-mono break-words">
+                      {item.fieldPath}
+                    </span>
+                    <span className="text-muted-foreground">
+                      {t("saveAllPreview.value.label", {
+                        ns: "views/settings",
+                      })}
+                    </span>
+                    <span className="font-mono whitespace-pre-wrap break-words">
+                      {formatValue(item.value)}
+                    </span>
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        )}
+      </PopoverContent>
+    </Popover>
+  );
+}

web/src/pages/Settings.tsx

@@ -87,6 +87,9 @@ import { RJSFSchema } from "@rjsf/utils";
 import { prepareSectionSavePayload } from "@/utils/configUtil";
 import ActivityIndicator from "@/components/indicators/activity-indicator";
 import RestartDialog from "@/components/overlay/dialog/RestartDialog";
+import SaveAllPreviewPopover, {
+  type SaveAllPreviewItem,
+} from "@/components/overlay/detail/SaveAllPreviewPopover";
 import { useRestart } from "@/api/ws";
 
 const allSettingsViews = [
@@ -152,6 +155,42 @@ const allSettingsViews = [
 ] as const;
 type SettingsType = (typeof allSettingsViews)[number];
 
+const parsePendingDataKey = (pendingDataKey: string) => {
+  if (pendingDataKey.includes("::")) {
+    const idx = pendingDataKey.indexOf("::");
+    return {
+      scope: "camera" as const,
+      cameraName: pendingDataKey.slice(0, idx),
+      sectionPath: pendingDataKey.slice(idx + 2),
+    };
+  }
+
+  return {
+    scope: "global" as const,
+    cameraName: undefined,
+    sectionPath: pendingDataKey,
+  };
+};
+
+const flattenOverrides = (
+  value: unknown,
+  path: string[] = [],
+): Array<{ path: string; value: unknown }> => {
+  if (value === undefined) return [];
+  if (value === null || typeof value !== "object" || Array.isArray(value)) {
+    return [{ path: path.join("."), value }];
+  }
+
+  const entries = Object.entries(value as Record<string, unknown>);
+  if (entries.length === 0) {
+    return [{ path: path.join("."), value: {} }];
+  }
+
+  return entries.flatMap(([key, entryValue]) =>
+    flattenOverrides(entryValue, [...path, key]),
+  );
+};
+
 const createSectionPage = (
   sectionKey: string,
   level: "global" | "camera",
@@ -620,6 +659,42 @@ export default function Settings() {
   const { data: fullSchema } = useSWR<RJSFSchema>("config/schema.json");
 
   const hasPendingChanges = Object.keys(pendingDataBySection).length > 0;
+  const pendingChangesPreview = useMemo<SaveAllPreviewItem[]>(() => {
+    if (!config || !fullSchema) return [];
+
+    const items: SaveAllPreviewItem[] = [];
+    Object.entries(pendingDataBySection).forEach(
+      ([pendingDataKey, pendingData]) => {
+        const payload = prepareSectionSavePayload({
+          pendingDataKey,
+          pendingData,
+          config,
+          fullSchema,
+        });
+
+        if (!payload) return;
+
+        const { scope, cameraName, sectionPath } =
+          parsePendingDataKey(pendingDataKey);
+        const flattened = flattenOverrides(payload.sanitizedOverrides);
+
+        flattened.forEach(({ path, value }) => {
+          const fieldPath = path ? `${sectionPath}.${path}` : sectionPath;
+          items.push({ scope, cameraName, fieldPath, value });
+        });
+      },
+    );
+
+    return items.sort((left, right) => {
+      const scopeCompare = left.scope.localeCompare(right.scope);
+      if (scopeCompare !== 0) return scopeCompare;
+      const cameraCompare = (left.cameraName ?? "").localeCompare(
+        right.cameraName ?? "",
+      );
+      if (cameraCompare !== 0) return cameraCompare;
+      return left.fieldPath.localeCompare(right.fieldPath);
+    });
+  }, [config, fullSchema, pendingDataBySection]);
 
   // Map a pendingDataKey to SettingsType menu key for clearing section status
   const pendingKeyToMenuKey = useCallback(
@@ -982,8 +1057,17 @@ export default function Settings() {
         {!contentMobileOpen && (
           <div className="flex size-full flex-col">
             <div className="sticky -top-2 z-50 mb-2 bg-background p-4">
-              <div className="flex items-center justify-center">
+              <div className="relative flex w-full items-center justify-center">
                 <Logo className="h-8" />
+                <div className="absolute right-0">
+                  <CameraSelectButton
+                    allCameras={cameras}
+                    selectedCamera={selectedCamera}
+                    setSelectedCamera={setSelectedCamera}
+                    cameraEnabledStates={cameraEnabledStates}
+                    currentPage={page}
+                  />
+                </div>
               </div>
               <div className="flex flex-row text-center">
                 <h2 className="ml-2 text-lg">
@@ -1035,12 +1119,20 @@ export default function Settings() {
             {hasPendingChanges && (
               <div className="sticky bottom-0 z-50 mt-2 bg-background p-4">
                 <div className="flex flex-col items-center gap-2">
-                  <span className="text-sm text-danger">
-                    {t("unsavedChanges", {
-                      ns: "views/settings",
-                      defaultValue: "You have unsaved changes",
-                    })}
-                  </span>
+                  <div className="flex items-center gap-2">
+                    <span className="text-sm text-danger">
+                      {t("unsavedChanges", {
+                        ns: "views/settings",
+                        defaultValue: "You have unsaved changes",
+                      })}
+                    </span>
+                    <SaveAllPreviewPopover
+                      items={pendingChangesPreview}
+                      className="h-7 w-7"
+                      align="center"
+                      side="top"
+                    />
+                  </div>
 
                   <Button
                     onClick={handleUndoAll}
@@ -1169,7 +1261,19 @@ export default function Settings() {
         </Heading>
         <div className="flex items-center gap-5">
           {hasPendingChanges && (
-            <div className="flex flex-row gap-2 border-r border-secondary pr-5">
+            <div
+              className={cn(
+                "flex flex-row items-center gap-2",
+                CAMERA_SELECT_BUTTON_PAGES.includes(page) &&
+                  "border-r border-secondary pr-5",
+              )}
+            >
+              <SaveAllPreviewPopover
+                items={pendingChangesPreview}
+                className="size-8"
+                align="end"
+                side="bottom"
+              />
               <Button
                 onClick={handleUndoAll}
                 variant="outline"