initial commit.

app/i18n/api.ts

@@ -0,0 +1,48 @@
+import { language_t } from "./lang";
+import { Cache } from "react-native-cache";
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import { LIBRETRANSLATE_BASE_URL } from "@/constants/api";
+
+const cache = new Cache({
+    namespace: "translation_terrace",
+    policy: {
+        maxEntries: 50000, // if unspecified, it can have unlimited entries
+        stdTTL: 0 // the standard ttl as number in seconds, default: 0 (unlimited)
+    },
+    backend: AsyncStorage
+});
+
+export class Translator {
+    constructor(public source : language_t, public target : language_t) {
+
+    }
+    async translate(text : string) {
+        const url = LIBRETRANSLATE_BASE_URL + `/translate`;
+        const res = await fetch(url, {
+            method: "POST",
+            body: JSON.stringify({
+                q: text,
+                source: this.source,
+                target: this.target,
+                format: "text",
+                alternatives: 3,
+                api_key: ""
+            }),
+            headers: { "Content-Type": "application/json" }
+        });
+        
+        const data = await res.json();
+        return data.translatedText
+    }
+}
+
+export class CachedTranslator extends Translator {
+    async translate (text : string) {
+        const key1 = `${this.source}::${this.target}::${text}`
+        const tr1 = await cache.get(key1);
+        if (tr1) return tr1;
+        const tr2 = await super.translate(text);
+        const key2 = `${this.source}::${this.target}::${text}`
+        await cache.set(key2, tr2);
+    }
+}

app/i18n/lang.ts

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+export const LANGUAGES = [
+    "en",
+    "es",
+    "fr",
+    "uk",
+    "rs",
+]
+
+export type language_t = typeof LANGUAGES[number];