feat: add location autocomplete

bun.lock

@@ -12,6 +12,7 @@
         "@radix-ui/react-label": "^2.1.7",
         "@radix-ui/react-select": "^2.2.6",
         "@radix-ui/react-slot": "^1.2.3",
+        "@vis.gl/react-google-maps": "^1.8.3",
         "better-auth": "^1.6.0",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
@@ -172,6 +173,8 @@
 
     "@floating-ui/utils": ["@floating-ui/utils@0.2.10", "", {}, "sha512-aGTxbpbg8/b5JfU1HXSrbH3wXZuLPJcNEcZQFMxLs3oSzgtVu6nFPkbbGGUvBcUjKV2YyB9Wxxabo+HEH9tcRQ=="],
 
+    "@googlemaps/js-api-loader": ["@googlemaps/js-api-loader@2.0.2", "", { "dependencies": { "@types/google.maps": "^3.53.1" } }, "sha512-bKVuTqatS8Jven5aFqVB7rCHF1VFEzpzyi0ruzO0GUR+A7m9oMqMgtnmpANj7kMYEvvhty8Fk7TnJ1MKjWHu+Q=="],
+
     "@humanfs/core": ["@humanfs/core@0.19.1", "", {}, "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA=="],
 
     "@humanfs/node": ["@humanfs/node@0.16.7", "", { "dependencies": { "@humanfs/core": "^0.19.1", "@humanwhocodes/retry": "^0.4.0" } }, "sha512-/zUx+yOsIrG4Y43Eh2peDeKCxlRt/gET6aHfaKpuq267qXdYDFViVHfMaLyygZOnl0kGWxFIgsBy8QFuTLUXEQ=="],
@@ -442,6 +445,8 @@
 
     "@types/estree": ["@types/estree@1.0.8", "", {}, "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w=="],
 
+    "@types/google.maps": ["@types/google.maps@3.58.1", "", {}, "sha512-X9QTSvGJ0nCfMzYOnaVs/k6/4L+7F5uCS+4iUmkLEls6J9S/Phv+m/i3mDeyc49ZBgwab3EFO1HEoBY7k98EGQ=="],
+
     "@types/json-schema": ["@types/json-schema@7.0.15", "", {}, "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA=="],
 
     "@types/json5": ["@types/json5@0.0.29", "", {}, "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ=="],
@@ -528,6 +533,8 @@
 
     "@unrs/resolver-binding-win32-x64-msvc": ["@unrs/resolver-binding-win32-x64-msvc@1.11.1", "", { "os": "win32", "cpu": "x64" }, "sha512-lrW200hZdbfRtztbygyaq/6jP6AKE8qQN2KvPcJ+x7wiD038YtnYtZ82IMNJ69GJibV7bwL3y9FgK+5w/pYt6g=="],
 
+    "@vis.gl/react-google-maps": ["@vis.gl/react-google-maps@1.8.3", "", { "dependencies": { "@googlemaps/js-api-loader": "^2.0.2", "@types/google.maps": "^3.54.10", "fast-deep-equal": "^3.1.3" }, "peerDependencies": { "react": ">=16.8.0 || ^19.0 || ^19.0.0-rc", "react-dom": ">=16.8.0 || ^19.0 || ^19.0.0-rc" } }, "sha512-DW7nEuvOJ299DmdBnvGiUARrgS/+sTEO1iJgG9J8YaErZqLoq7S4TJ22f3EjJvR4dti4L4gft43JEK77nnKXDw=="],
+
     "acorn": ["acorn@8.15.0", "", { "bin": { "acorn": "bin/acorn" } }, "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg=="],
 
     "acorn-jsx": ["acorn-jsx@5.3.2", "", { "peerDependencies": { "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0" } }, "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ=="],

src/app/api/location-autocomplete/route.ts

@@ -0,0 +1,61 @@
+import { NextResponse } from "next/server";
+import {
+	getGoogleMapsLocationCapability,
+	getGoogleMapsServerApiKey,
+	mapGooglePlacesSuggestions,
+} from "@/lib/google-maps";
+
+const AUTOCOMPLETE_FIELD_MASK = [
+	"suggestions.placePrediction.place",
+	"suggestions.placePrediction.placeId",
+	"suggestions.placePrediction.text.text",
+	"suggestions.placePrediction.structuredFormat.mainText.text",
+	"suggestions.placePrediction.structuredFormat.secondaryText.text",
+].join(",");
+
+export async function GET(request: Request) {
+	const capability = getGoogleMapsLocationCapability();
+	if (!capability.enabled) {
+		return NextResponse.json({ suggestions: [] }, { status: 503 });
+	}
+
+	const apiKey = getGoogleMapsServerApiKey();
+	if (!apiKey) {
+		return NextResponse.json({ suggestions: [] }, { status: 503 });
+	}
+
+	const { searchParams } = new URL(request.url);
+	const input = searchParams.get("input")?.trim();
+	const sessionToken = searchParams.get("sessionToken")?.trim();
+
+	if (!input) {
+		return NextResponse.json({ suggestions: [] });
+	}
+
+	const response = await fetch(
+		"https://places.googleapis.com/v1/places:autocomplete",
+		{
+			method: "POST",
+			headers: {
+				"Content-Type": "application/json",
+				"X-Goog-Api-Key": apiKey,
+				"X-Goog-FieldMask": AUTOCOMPLETE_FIELD_MASK,
+			},
+			body: JSON.stringify({
+				input,
+				sessionToken: sessionToken || undefined,
+			}),
+		},
+	);
+
+	if (!response.ok) {
+		return NextResponse.json({ suggestions: [] }, { status: 502 });
+	}
+
+	const payload = (await response.json()) as Parameters<
+		typeof mapGooglePlacesSuggestions
+	>[0];
+	return NextResponse.json({
+		suggestions: mapGooglePlacesSuggestions(payload),
+	});
+}

src/components/event-dialog.tsx

@@ -3,8 +3,8 @@
 import { addHours, addMinutes, isValid, parseISO } from "date-fns";
 import { useEffect } from "react";
 import { Controller, useForm } from "react-hook-form";
-import { LucideMapPin } from "lucide-react";
 import { DateTimePicker } from "@/components/date-time-picker";
+import { LocationAutocomplete } from "@/components/location-autocomplete";
 import { RecurrencePicker } from "@/components/recurrence-picker";
 import { Button } from "@/components/ui/button";
 import { Checkbox } from "@/components/ui/checkbox";
@@ -19,12 +19,12 @@ import {
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { Textarea } from "@/components/ui/textarea";
-import { validateRecurrence, parseRecurrenceRule } from "@/lib/recurrence";
 import {
+	type EventFormValues,
 	getDefaultEventFormValues,
 	validateEventFormValues,
-	type EventFormValues,
 } from "@/lib/event-form";
+import { parseRecurrenceRule, validateRecurrence } from "@/lib/recurrence";
 
 interface EventDialogProps {
 	open: boolean;
@@ -46,7 +46,11 @@ export const EventDialog = ({
 	onReset,
 }: EventDialogProps) => {
 	const isAiDraft = dialogSource === "ai" && !editingId;
-	const titleText = editingId ? "Edit Event" : isAiDraft ? "Review AI Draft" : "New Event";
+	const titleText = editingId
+		? "Edit Event"
+		: isAiDraft
+			? "Review AI Draft"
+			: "New Event";
 	const descriptionText = editingId
 		? "Update the event details below. Title and start date are required."
 		: isAiDraft
@@ -89,11 +93,16 @@ export const EventDialog = ({
 		{ label: "+3 hours", minutes: 180 },
 	];
 
-	const handleApplyDuration = (minutes: number, currentAllDay: boolean, currentStart: string) => {
+	const handleApplyDuration = (
+		minutes: number,
+		currentAllDay: boolean,
+		currentStart: string,
+	) => {
 		if (!currentStart) return;
 		const base = parseISO(currentStart);
 		if (!isValid(base)) return;
-		const next = minutes < 60 ? addMinutes(base, minutes) : addHours(base, minutes / 60);
+		const next =
+			minutes < 60 ? addMinutes(base, minutes) : addHours(base, minutes / 60);
 		const pad = (value: number) => String(value).padStart(2, "0");
 		const result = currentAllDay
 			? `${next.getFullYear()}-${pad(next.getMonth() + 1)}-${pad(next.getDate())}`
@@ -108,14 +117,18 @@ export const EventDialog = ({
 			for (const [fieldName, messages] of Object.entries(fieldErrors)) {
 				const firstMessage = messages?.[0];
 				if (firstMessage) {
-					setError(fieldName as keyof EventFormValues, { message: firstMessage });
+					setError(fieldName as keyof EventFormValues, {
+						message: firstMessage,
+					});
 				}
 			}
 			return;
 		}
 
 		if (values.recurrenceRule) {
-			const recurrenceValidation = validateRecurrence(parseRecurrenceRule(values.recurrenceRule));
+			const recurrenceValidation = validateRecurrence(
+				parseRecurrenceRule(values.recurrenceRule),
+			);
 			if (!recurrenceValidation.isValid) {
 				setError("recurrenceRule", {
 					message:
@@ -143,14 +156,22 @@ export const EventDialog = ({
 				<form className="space-y-3" onSubmit={onSubmit}>
 					{isAiDraft && (
 						<div className="rounded-md border border-primary/20 bg-primary/5 px-3 py-2 text-xs leading-relaxed text-primary">
-							This draft was generated from natural language. Double-check dates, times, location, recurrence, and links before saving.
+							This draft was generated from natural language. Double-check
+							dates, times, location, recurrence, and links before saving.
 						</div>
 					)}
 
 					<div className="space-y-1.5">
 						<Label htmlFor="event-title">Title</Label>
-						<Input id="event-title" placeholder="Event title" className="font-medium" {...register("title")} />
+						<Input
-						{errors.title && <p className="text-xs text-destructive">{errors.title.message}</p>}
+							id="event-title"
+							placeholder="Event title"
+							className="font-medium"
+							{...register("title")}
+						/>
+						{errors.title && (
+							<p className="text-xs text-destructive">{errors.title.message}</p>
+						)}
 					</div>
 
 					<div className="space-y-1.5">
@@ -163,18 +184,27 @@ export const EventDialog = ({
 						/>
 					</div>
 
-					<div className="grid grid-cols-2 gap-3">
+					<div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
 						<div className="space-y-1.5">
 							<Label htmlFor="event-location">Location</Label>
-							<div className="relative">
+							<Controller
-								<LucideMapPin className="absolute left-3 top-1/2 h-3.5 w-3.5 -translate-y-1/2 text-muted-foreground/50" />
+								name="location"
-								<Input id="event-location" placeholder="Location" className="pl-8" {...register("location")} />
+								control={control}
-							</div>
+								render={({ field }) => (
+									<LocationAutocomplete
+										id="event-location"
+										onChange={field.onChange}
+										value={field.value}
+									/>
+								)}
+							/>
 						</div>
 						<div className="space-y-1.5">
 							<Label htmlFor="event-url">URL</Label>
 							<Input id="event-url" placeholder="URL" {...register("url")} />
-							{errors.url && <p className="text-xs text-destructive">{errors.url.message}</p>}
+							{errors.url && (
+								<p className="text-xs text-destructive">{errors.url.message}</p>
+							)}
 						</div>
 					</div>
 
@@ -182,11 +212,17 @@ export const EventDialog = ({
 						name="recurrenceRule"
 						control={control}
 						render={({ field }) => (
-							<RecurrencePicker value={field.value} onChange={field.onChange} start={start} />
+							<RecurrencePicker
+								value={field.value}
+								onChange={field.onChange}
+								start={start}
+							/>
 						)}
 					/>
 					{errors.recurrenceRule && (
-						<p className="text-xs text-destructive">{errors.recurrenceRule.message}</p>
+						<p className="text-xs text-destructive">
+							{errors.recurrenceRule.message}
+						</p>
 					)}
 
 					<div className="flex items-center gap-2 py-1">
@@ -197,11 +233,16 @@ export const EventDialog = ({
 								<Checkbox
 									id="event-all-day"
 									checked={field.value}
-									onCheckedChange={(checked) => field.onChange(checked === true)}
+									onCheckedChange={(checked) =>
+										field.onChange(checked === true)
+									}
 								/>
 							)}
 						/>
-						<Label htmlFor="event-all-day" className="cursor-pointer text-sm font-normal">
+						<Label
+							htmlFor="event-all-day"
+							className="cursor-pointer text-sm font-normal"
+						>
 							All day
 						</Label>
 					</div>
@@ -211,7 +252,12 @@ export const EventDialog = ({
 							name="start"
 							control={control}
 							render={({ field }) => (
-								<DateTimePicker value={field.value} onChange={field.onChange} allDay={allDay} placeholder="Start date" />
+								<DateTimePicker
+									value={field.value}
+									onChange={field.onChange}
+									allDay={allDay}
+									placeholder="Start date"
+								/>
 							)}
 						/>
 						{!allDay && (
@@ -227,7 +273,9 @@ export const EventDialog = ({
 												variant="ghost"
 												size="sm"
 												disabled={!start}
-											onClick={() => handleApplyDuration(minutes, allDay, start)}
+												onClick={() =>
+													handleApplyDuration(minutes, allDay, start)
+												}
 												className="px-2 py-1 text-xs text-muted-foreground"
 											>
 												{label}
@@ -241,15 +289,28 @@ export const EventDialog = ({
 							name="end"
 							control={control}
 							render={({ field }) => (
-								<DateTimePicker value={field.value} onChange={field.onChange} allDay={allDay} placeholder="End date" />
+								<DateTimePicker
+									value={field.value}
+									onChange={field.onChange}
+									allDay={allDay}
+									placeholder="End date"
+								/>
 							)}
 						/>
-						{errors.start && <p className="text-xs text-destructive">{errors.start.message}</p>}
+						{errors.start && (
-						{errors.end && <p className="text-xs text-destructive">{errors.end.message}</p>}
+							<p className="text-xs text-destructive">{errors.start.message}</p>
+						)}
+						{errors.end && (
+							<p className="text-xs text-destructive">{errors.end.message}</p>
+						)}
 					</div>
 
 					<DialogFooter className="gap-2 sm:gap-0">
-						<Button type="button" variant="ghost" onClick={() => handleOpenChange(false)}>
+						<Button
+							type="button"
+							variant="ghost"
+							onClick={() => handleOpenChange(false)}
+						>
 							Cancel
 						</Button>
 						<Button type="submit">{saveLabel}</Button>

src/components/location-autocomplete.tsx

@@ -0,0 +1,222 @@
+"use client";
+
+import { LucideMapPin } from "lucide-react";
+import { useEffect, useMemo, useRef, useState } from "react";
+import { Input } from "@/components/ui/input";
+import {
+	type GoogleMapsLocationCapability,
+	type GoogleMapsSuggestion,
+	getGoogleMapsLocationCapability,
+	getGoogleMapsPlaceLabel,
+	getLocationAutocompletePlaceholder,
+} from "@/lib/google-maps";
+import { cn } from "@/lib/utils";
+
+interface LocationAutocompleteProps {
+	capability?: GoogleMapsLocationCapability;
+	className?: string;
+	id: string;
+	onChange: (value: string) => void;
+	value: string;
+}
+
+const SEARCH_HELP_TEXT = "Search Google Maps or keep typing a custom location.";
+const SEARCH_UNAVAILABLE_TEXT =
+	"Google Maps search is unavailable right now. You can still type a location.";
+
+export const LocationAutocomplete = ({
+	capability,
+	className,
+	id,
+	onChange,
+	value,
+}: LocationAutocompleteProps) => {
+	const resolvedCapability = capability ?? getGoogleMapsLocationCapability();
+
+	if (!resolvedCapability.enabled) {
+		return (
+			<ManualLocationInput
+				className={className}
+				id={id}
+				onChange={onChange}
+				placeholder={getLocationAutocompletePlaceholder(resolvedCapability)}
+				value={value}
+			/>
+		);
+	}
+
+	return (
+		<ServerLocationInput
+			capability={resolvedCapability}
+			className={className}
+			id={id}
+			onChange={onChange}
+			value={value}
+		/>
+	);
+};
+
+const ManualLocationInput = ({
+	className,
+	id,
+	onChange,
+	placeholder,
+	value,
+}: Omit<LocationAutocompleteProps, "capability"> & { placeholder: string }) => {
+	return (
+		<div className="space-y-1.5" data-location-mode="manual">
+			<div className="relative">
+				<LucideMapPin className="absolute left-3 top-1/2 h-3.5 w-3.5 -translate-y-1/2 text-muted-foreground/50" />
+				<Input
+					className={cn("pl-8", className)}
+					id={id}
+					onChange={(event) => onChange(event.target.value)}
+					placeholder={placeholder}
+					value={value}
+				/>
+			</div>
+		</div>
+	);
+};
+
+const ServerLocationInput = ({
+	capability,
+	className,
+	id,
+	onChange,
+	value,
+}: Omit<LocationAutocompleteProps, "capability"> & {
+	capability: GoogleMapsLocationCapability;
+}) => {
+	const [hasSearchError, setHasSearchError] = useState(false);
+	const [isLoadingSuggestions, setIsLoadingSuggestions] = useState(false);
+	const [suggestions, setSuggestions] = useState<GoogleMapsSuggestion[]>([]);
+	const sessionTokenRef = useRef<string | null>(null);
+	const skipNextLookupRef = useRef(false);
+
+	const helperText = useMemo(() => {
+		return hasSearchError ? SEARCH_UNAVAILABLE_TEXT : SEARCH_HELP_TEXT;
+	}, [hasSearchError]);
+
+	useEffect(() => {
+		if (skipNextLookupRef.current) {
+			skipNextLookupRef.current = false;
+			return;
+		}
+
+		const query = value.trim();
+		if (!query || hasSearchError) {
+			setSuggestions([]);
+			setIsLoadingSuggestions(false);
+			return;
+		}
+
+		if (!sessionTokenRef.current) {
+			sessionTokenRef.current = crypto.randomUUID();
+		}
+
+		const controller = new AbortController();
+		setIsLoadingSuggestions(true);
+
+		void fetch(
+			`/api/location-autocomplete?input=${encodeURIComponent(query)}&sessionToken=${encodeURIComponent(sessionTokenRef.current)}`,
+			{ signal: controller.signal },
+		)
+			.then(async (response) => {
+				if (!response.ok) {
+					throw new Error("Autocomplete request failed");
+				}
+
+				return (await response.json()) as {
+					suggestions?: GoogleMapsSuggestion[];
+				};
+			})
+			.then((payload) => {
+				setSuggestions(payload.suggestions ?? []);
+			})
+			.catch((error) => {
+				if (controller.signal.aborted) {
+					return;
+				}
+
+				console.error("Location autocomplete failed", error);
+				setHasSearchError(true);
+				setSuggestions([]);
+			})
+			.finally(() => {
+				if (!controller.signal.aborted) {
+					setIsLoadingSuggestions(false);
+				}
+			});
+
+		return () => controller.abort();
+	}, [hasSearchError, value]);
+
+	const handleSuggestionSelect = (suggestion: GoogleMapsSuggestion) => {
+		const nextValue = getGoogleMapsPlaceLabel({
+			formattedAddress: suggestion.formattedAddress,
+			name: suggestion.text,
+			predictionText: suggestion.text,
+		});
+
+		if (!nextValue) {
+			return;
+		}
+
+		skipNextLookupRef.current = true;
+		sessionTokenRef.current = null;
+		setSuggestions([]);
+		onChange(nextValue);
+	};
+
+	const showSuggestions = suggestions.length > 0 && !hasSearchError;
+
+	return (
+		<div className="space-y-1.5" data-location-mode="google-maps-server">
+			<div className="relative">
+				<LucideMapPin className="absolute left-3 top-1/2 h-3.5 w-3.5 -translate-y-1/2 text-muted-foreground/50" />
+				<Input
+					aria-autocomplete="list"
+					aria-expanded={showSuggestions}
+					className={cn("pl-8", className)}
+					id={id}
+					onChange={(event) => {
+						setHasSearchError(false);
+						onChange(event.target.value);
+					}}
+					placeholder={getLocationAutocompletePlaceholder(capability)}
+					role="combobox"
+					value={value}
+				/>
+				{showSuggestions ? (
+					<div className="absolute left-0 right-0 top-[calc(100%+0.375rem)] z-20 rounded-md border border-border/60 bg-background/95 p-1 shadow-lg backdrop-blur-sm">
+						<div className="space-y-1" role="listbox">
+							{suggestions.map((suggestion) => {
+								const suggestionKey =
+									suggestion.placeId || suggestion.text || "suggestion";
+
+								return (
+									<div key={suggestionKey}>
+										<button
+											className="w-full rounded-sm px-3 py-2 text-left text-sm text-foreground transition hover:bg-accent hover:text-accent-foreground"
+											onClick={() => handleSuggestionSelect(suggestion)}
+											type="button"
+										>
+											{suggestion.text || "Use this place"}
+										</button>
+									</div>
+								);
+							})}
+						</div>
+					</div>
+				) : null}
+			</div>
+			<p className="text-xs text-muted-foreground">{helperText}</p>
+			{isLoadingSuggestions ? (
+				<p className="text-xs text-muted-foreground">
+					Loading place suggestions…
+				</p>
+			) : null}
+		</div>
+	);
+};

src/lib/google-maps.ts

@@ -0,0 +1,170 @@
+export interface GoogleMapsLocationConfig {
+	enabled?: boolean | null;
+	region?: string | null;
+	publicEnabled?: boolean | null;
+	serverApiKey?: string | null;
+}
+
+export interface GoogleMapsLocationCapability {
+	enabled: boolean;
+	reason: "configured" | "missing_server_api_key" | "disabled";
+	region: string;
+}
+
+export interface GoogleMapsPlaceLabelSource {
+	displayName?: string | { text?: string | null } | null;
+	formattedAddress?: string | null;
+	name?: string | null;
+	predictionText?: string | null;
+}
+
+export interface GoogleMapsSuggestion {
+	formattedAddress?: string;
+	placeId?: string;
+	text: string;
+}
+
+const DEFAULT_GOOGLE_MAPS_REGION = "us";
+
+const normalizeConfigValue = (value?: string | null) => {
+	const trimmedValue = value?.trim();
+	return trimmedValue ? trimmedValue : null;
+};
+
+const getDisplayNameText = (
+	displayName?: string | { text?: string | null } | null,
+) => {
+	if (typeof displayName === "string") {
+		return normalizeConfigValue(displayName);
+	}
+
+	return normalizeConfigValue(displayName?.text);
+};
+
+const parseEnabledValue = (value?: string | null) => {
+	const normalizedValue = normalizeConfigValue(value)?.toLowerCase();
+
+	if (!normalizedValue) {
+		return true;
+	}
+
+	return !["0", "false", "no", "off"].includes(normalizedValue);
+};
+
+export const getGoogleMapsLocationCapability = (
+	config: GoogleMapsLocationConfig = {},
+): GoogleMapsLocationCapability => {
+	const enabled =
+		typeof config.enabled === "boolean"
+			? config.enabled
+			: typeof config.publicEnabled === "boolean"
+				? config.publicEnabled
+				: parseEnabledValue(
+						process.env.NEXT_PUBLIC_GOOGLE_MAPS_AUTOCOMPLETE_ENABLED,
+					);
+	const serverApiKey = normalizeConfigValue(
+		config.serverApiKey ?? process.env.GOOGLE_MAPS_API_KEY,
+	);
+	const region =
+		normalizeConfigValue(config.region ?? process.env.GOOGLE_MAPS_REGION) ??
+		DEFAULT_GOOGLE_MAPS_REGION;
+
+	if (!enabled) {
+		return {
+			enabled: false,
+			reason: "disabled",
+			region,
+		};
+	}
+
+	if (typeof window !== "undefined") {
+		return {
+			enabled: true,
+			reason: "configured",
+			region,
+		};
+	}
+
+	if (!serverApiKey) {
+		return {
+			enabled: false,
+			reason: "missing_server_api_key",
+			region,
+		};
+	}
+
+	return {
+		enabled: true,
+		reason: "configured",
+		region,
+	};
+};
+
+export const getGoogleMapsServerApiKey = () =>
+	normalizeConfigValue(process.env.GOOGLE_MAPS_API_KEY);
+
+export const getGoogleMapsPlaceLabel = (source: GoogleMapsPlaceLabelSource) => {
+	return (
+		normalizeConfigValue(source.predictionText) ??
+		getDisplayNameText(source.displayName) ??
+		normalizeConfigValue(source.formattedAddress) ??
+		normalizeConfigValue(source.name) ??
+		""
+	);
+};
+
+export const getLocationAutocompletePlaceholder = (
+	capability: GoogleMapsLocationCapability,
+) => {
+	return capability.enabled
+		? "Search Google Maps or type a location"
+		: "Location";
+};
+
+interface GooglePlacesAutocompleteResponse {
+	suggestions?: Array<{
+		placePrediction?: {
+			place?: string;
+			placeId?: string;
+			text?: { text?: string | null };
+			structuredFormat?: {
+				mainText?: { text?: string | null };
+				secondaryText?: { text?: string | null };
+			};
+		};
+	}>;
+}
+
+export const mapGooglePlacesSuggestions = (
+	payload: GooglePlacesAutocompleteResponse,
+): GoogleMapsSuggestion[] => {
+	const suggestions: GoogleMapsSuggestion[] = [];
+
+	for (const suggestion of payload.suggestions ?? []) {
+		const placePrediction = suggestion.placePrediction;
+		const text =
+			normalizeConfigValue(placePrediction?.text?.text) ??
+			normalizeConfigValue(placePrediction?.structuredFormat?.mainText?.text) ??
+			"";
+
+		if (!text) {
+			continue;
+		}
+
+		suggestions.push({
+			formattedAddress:
+				normalizeConfigValue(
+					placePrediction?.structuredFormat?.secondaryText?.text,
+				) ?? undefined,
+			placeId:
+				normalizeConfigValue(placePrediction?.placeId) ??
+				normalizeConfigValue(
+					placePrediction?.place?.replace(/^places\//, ""),
+				) ??
+				undefined,
+			text,
+		});
+	}
+
+	return suggestions;
+};

tests/location-autocomplete.test.ts

@@ -0,0 +1,111 @@
+import { describe, expect, test } from "bun:test";
+import { createElement } from "react";
+import { renderToStaticMarkup } from "react-dom/server";
+import {
+	getGoogleMapsLocationCapability,
+	getGoogleMapsPlaceLabel,
+	mapGooglePlacesSuggestions,
+} from "@/lib/google-maps";
+
+const renderLocationAutocomplete = async (capability: {
+	enabled: boolean;
+	region: string;
+	reason: "configured" | "missing_server_api_key" | "disabled";
+}) => {
+	const { LocationAutocomplete } = await import("@/components/location-autocomplete");
+
+	return renderToStaticMarkup(
+		createElement(LocationAutocomplete, {
+			capability,
+			id: "event-location",
+			onChange: () => {},
+			value: "",
+		}),
+	);
+};
+
+describe("Google Maps location capability boundary", () => {
+	test("disables Google Maps search when the server API key is missing", () => {
+		expect(getGoogleMapsLocationCapability({ serverApiKey: "" })).toEqual({
+			enabled: false,
+			reason: "missing_server_api_key",
+			region: "us",
+		});
+	});
+
+	test("enables Google Maps search when the server API key is present", () => {
+		expect(
+			getGoogleMapsLocationCapability({ serverApiKey: "maps-server-key", region: "gb" }),
+		).toEqual({
+			enabled: true,
+			reason: "configured",
+			region: "gb",
+		});
+	});
+});
+
+describe("LocationAutocomplete fallback mode", () => {
+	test("renders a plain text location field when Google Maps configuration is unavailable", async () => {
+		const markup = await renderLocationAutocomplete({
+			enabled: false,
+			reason: "missing_server_api_key",
+			region: "us",
+		});
+
+		expect(markup).toContain('data-location-mode="manual"');
+		expect(markup).toContain('placeholder="Location"');
+		expect(markup).not.toContain("Search Google Maps");
+	});
+});
+
+describe("LocationAutocomplete configured mode", () => {
+	test("renders a server-backed Google Maps-assisted input path while keeping manual typing available", async () => {
+		const markup = await renderLocationAutocomplete({
+			enabled: true,
+			reason: "configured",
+			region: "us",
+		});
+
+		expect(markup).toContain('data-location-mode="google-maps-server"');
+		expect(markup).toContain('placeholder="Search Google Maps or type a location"');
+		expect(markup).toContain("Search Google Maps or keep typing a custom location.");
+	});
+});
+
+describe("Google Maps place label selection", () => {
+	test("prefers the chosen prediction label for the visible location value", () => {
+		expect(
+			getGoogleMapsPlaceLabel({
+				displayName: "Google HQ",
+				formattedAddress: "1600 Amphitheatre Parkway, Mountain View, CA",
+				predictionText: "Googleplex",
+			}),
+		).toBe("Googleplex");
+	});
+});
+
+describe("Google Places server response mapping", () => {
+	test("maps server autocomplete predictions into lightweight suggestion records", () => {
+		expect(
+			mapGooglePlacesSuggestions({
+				suggestions: [
+					{
+						placePrediction: {
+							place: "places/abc123",
+							structuredFormat: {
+								secondaryText: { text: "Mountain View, CA" },
+							},
+							text: { text: "Googleplex" },
+						},
+					},
+				],
+			}),
+		).toEqual([
+			{
+				formattedAddress: "Mountain View, CA",
+				placeId: "abc123",
+				text: "Googleplex",
+			},
+		]);
+	});
+});