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import { AI_WEATHER_TOOL, requestAiWeather } from "./ai-weather";
import type { DataState, LocationValue } from "./live-state";
import type { PhoneLocale } from "./phone-types";
const MAX_LOCATION_AGE_MS = 120_000;
const MAX_SEARCH_QUERY = 500;
export type AiCitationSource = {
readonly title: string;
readonly url: string;
};
export type AiWebSearchUsage = {
readonly model: string;
readonly inputTokens: number;
readonly cachedInputTokens: number;
readonly outputTokens: number;
readonly webSearchCalls: number;
};
export type AiWebSearchResult = {
readonly answer: string;
readonly sources: readonly AiCitationSource[];
readonly usage: AiWebSearchUsage;
};
export type BuiltinAiToolResult =
| {
readonly ok: true;
readonly data: Record<string, unknown>;
readonly sources?: readonly AiCitationSource[];
readonly usage?: AiWebSearchUsage;
}
| {
readonly ok: false;
readonly error: { readonly code: string; readonly message: string };
};
export const BUILTIN_AI_TOOLS = [
AI_WEATHER_TOOL,
{
type: "function" as const,
name: "get_current_time",
description: "Get the exact current local time, date, timezone, and UTC offset.",
parameters: { type: "object", properties: {}, additionalProperties: false },
},
{
type: "function" as const,
name: "get_current_location",
description: "Get the latest exact live GPS location from the user's glasses session. Call only when location is needed.",
parameters: { type: "object", properties: {}, additionalProperties: false },
},
{
type: "function" as const,
name: "search_web",
description: "Search the live web for current or factual information and return grounded sources.",
parameters: {
type: "object",
properties: {
query: { type: "string", minLength: 1, maxLength: MAX_SEARCH_QUERY },
},
required: ["query"],
additionalProperties: false,
},
},
] as const;
function failed(code: string, message: string): BuiltinAiToolResult {
return { ok: false, error: { code, message } };
}
function utcOffset(date: Date): string {
const minutes = -date.getTimezoneOffset();
const sign = minutes >= 0 ? "+" : "-";
const absolute = Math.abs(minutes);
return `${sign}${String(Math.floor(absolute / 60)).padStart(2, "0")}`
+ `:${String(absolute % 60).padStart(2, "0")}`;
}
function parseObject(value: string): Record<string, unknown> | undefined {
if (value.length > 2_048) return undefined;
try {
const parsed: unknown = JSON.parse(value || "{}");
return typeof parsed === "object" && parsed !== null && !Array.isArray(parsed)
? parsed as Record<string, unknown>
: undefined;
} catch {
return undefined;
}
}
export async function executeBuiltinAiTool(
name: string,
rawArguments: string,
context: {
readonly locale: PhoneLocale;
readonly fetchImpl?: typeof fetch;
readonly signal?: AbortSignal;
readonly now: () => Date;
readonly getLocation: () => DataState<LocationValue>;
readonly searchWeb: (
query: string,
locale: PhoneLocale,
) => Promise<AiWebSearchResult>;
},
): Promise<BuiltinAiToolResult> {
const args = parseObject(rawArguments);
if (!args) return failed("INVALID_ARGUMENTS", "Tool arguments are invalid");
if(name === "get_weather") {
try { const result=await requestAiWeather(args,{locale:context.locale,fetchImpl:context.fetchImpl,signal:context.signal});return {ok:true,...result}; }
catch(error) { return failed("WEATHER_UNAVAILABLE",error instanceof Error?error.message:"Weather is unavailable"); }
}
if (name === "get_current_time") {
const date = context.now();
const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone || "UTC";
return {
ok: true,
data: {
iso: date.toISOString(),
timezone,
utcOffset: utcOffset(date),
locale: context.locale,
display: new Intl.DateTimeFormat(context.locale, {
dateStyle: "full",
timeStyle: "long",
timeZone: timezone,
}).format(date),
},
};
}
if (name === "get_current_location") {
const location = context.getLocation();
const age = context.now().getTime() - (location.fetchedAt ?? 0);
if (
location.status !== "fresh"
|| location.value?.source !== "live"
|| age < 0
|| age > MAX_LOCATION_AGE_MS
) {
return failed("LOCATION_UNAVAILABLE", "Live GPS is unavailable");
}
return {
ok: true,
data: {
latitude: location.value.coordinate.latitude,
longitude: location.value.coordinate.longitude,
accuracyMeters: location.value.accuracy,
speedMetersPerSecond: location.value.speed,
headingDegrees: location.value.heading,
source: "live",
timestamp: new Date(location.fetchedAt ?? context.now().getTime())
.toISOString(),
},
};
}
if (name === "search_web") {
const query = typeof args.query === "string" ? args.query.trim() : "";
if (!query || query.length > MAX_SEARCH_QUERY) {
return failed("INVALID_ARGUMENTS", "A bounded search query is required");
}
try {
const result = await context.searchWeb(query, context.locale);
return {
ok: true,
data: { answer: result.answer, sources: result.sources },
sources: result.sources,
usage: result.usage,
};
} catch {
return failed("WEB_SEARCH_FAILED", "Web search is unavailable");
}
}
return failed("UNKNOWN_TOOL", "The requested tool is unavailable");
}