feat(routing): detect TTS language from valhalla trip

messages/de.json

@@ -160,5 +160,9 @@
 	"poi": {
 		"fuel": "Tankstelle",
 		"parking": "Parken"
+	},
+	"routing": {
+		"off-route": "Sie sind von der Route abgekommen",
+		"back-on-route": "Sie sind wieder auf der Route"
 	}
 }

messages/en.json

@@ -160,5 +160,9 @@
 	"poi": {
 		"fuel": "Fuel Station",
 		"parking": "Parking"
+	},
+	"routing": {
+		"off-route": "You went off route",
+		"back-on-route": "You are back on route"
 	}
 }

src/lib/services/navigation/TTS.ts

@@ -1,6 +1,7 @@
 import { duck, unduck } from "tauri-plugin-duck-api";
 import { invoke } from "@tauri-apps/api/core";
 import { m } from "$lang/messages";
+import { locales, type Locale } from "$lang/runtime";
 
 export let tts: "tauri" | "web" | null = null;
 
@@ -14,7 +15,15 @@ export async function initTTS() {
 	}
 }
 
-export default async function say(text: string) {
+export function findLocaleForValhallaLanguage(language: string) {
+	for(const locale of locales) {
+		if(m["language.valhalla"]({ language }, { locale }) === language) {
+			return locale;
+		}
+	}
+}
+
+export default async function say(text: string, language?: Locale) {
 	if (!tts) {
 		// alert("TTS not initialized");
 		// console.error("TTS not initialized");
@@ -24,7 +33,7 @@ export default async function say(text: string) {
 	duck();
 	if (tts !== "web") {
 		try {
-			await invoke("plugin:tts|speak", { text, language: m["language.tts"]() });
+			await invoke("plugin:tts|speak", { text, language: language ? m["language.tts"]({}, { locale: language }) : m["language.tts"]() });
 		} catch (e) {
 			console.error("Error speaking text", e);
 			alert(e);

src/lib/services/navigation/routing.svelte.ts

@@ -1,10 +1,11 @@
 import { location } from "$lib/components/lnv/location.svelte";
 import { map } from "$lib/components/lnv/map.svelte";
-import say from "./TTS";
+import say, { findLocaleForValhallaLanguage } from "./TTS";
 import type { ValhallaRequest } from "./ValhallaRequest";
 import type { LngLatBoundsLike } from "maplibre-gl";
 import { generateVoiceGuidance } from "./VoiceGuidance";
 import { keepScreenOn } from "tauri-plugin-keep-screen-on-api";
+import { m } from "$lang/messages";
 
 export const routing = $state({
 	geojson: {
@@ -180,14 +181,14 @@ async function tickRoute() {
 	if (!isOnShape(loc, polyline)) {
 		console.log("Off route!");
 		if (!info.isOffRoute) {
-			say("You went off route.");
+			say(m["routing.off-route"]());
 		}
 		info.isOffRoute = true;
 		// TODO: Implement re-routing logic
 		return;
 	} else {
 		if (info.isOffRoute) {
-			say("You are back on route.");
+			say(m["routing.back-on-route"]());
 		}
 		info.isOffRoute = false;
 	}
@@ -212,7 +213,8 @@ async function tickRoute() {
 				// currentManeuver.verbal_pre_transition_instruction,
 				instruction,
 			);
-			say(instruction);
+			const locale = findLocaleForValhallaLanguage(trip.language);
+			say(instruction, locale);
 		}
 	}
 
@@ -244,7 +246,8 @@ async function tickRoute() {
 				"[Verbal instruction] ",
 				currentManeuver.verbal_post_transition_instruction,
 			);
-			say(currentManeuver.verbal_post_transition_instruction);
+			const locale = findLocaleForValhallaLanguage(trip.language);
+			say(currentManeuver.verbal_post_transition_instruction, locale);
 		}
 	}