fix unit tests. add conversation model and add unit tests to it.

app/(tabs)/_layout.tsx

@@ -2,7 +2,6 @@ import { Tabs } from 'expo-router';
 import React from 'react';
 import { Platform } from 'react-native';
 
-import { HapticTab } from '@/components/HapticTab';
 import { IconSymbol } from '@/components/ui/IconSymbol';
 import TabBarBackground from '@/components/ui/TabBarBackground';
 import { Colors } from '@/constants/Colors';
@@ -16,7 +15,6 @@ export default function TabLayout() {
       screenOptions={{
         tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
         headerShown: false,
-        tabBarButton: HapticTab,
         tabBarBackground: TabBarBackground,
         tabBarStyle: Platform.select({
           ios: {

app/(tabs)/explore.tsx

@@ -1,23 +0,0 @@
-import { StyleSheet, Image, Platform } from 'react-native';
-
-import { IconSymbol } from '@/components/ui/IconSymbol';
-import { Text } from '@react-navigation/elements';
-
-export default function TabTwoScreen() {
-  return (
-    <Text>Explore</Text>
-  );
-}
-
-const styles = StyleSheet.create({
-  headerImage: {
-    color: '#808080',
-    bottom: -90,
-    left: -35,
-    position: 'absolute',
-  },
-  titleContainer: {
-    flexDirection: 'row',
-    gap: 8,
-  },
-});

app/(tabs)/index.tsx

@@ -1,5 +1,5 @@
 import { LanguageSelection } from '@/components/LanguageSelection';
-import { Text } from '@react-navigation/elements';
+import { Text } from 'react-native';
 import { Image, StyleSheet, Platform } from 'react-native';
 
 export default function HomeScreen() {

app/+not-found.tsx

@@ -2,7 +2,7 @@ import { Link, Stack } from 'expo-router';
 import { StyleSheet } from 'react-native';
 
 import { ThemedText } from '@/components/ThemedText';
-import { Text } from '@react-navigation/elements';
+import { Text } from 'react-native';
 export default function NotFoundScreen() {
   return (
     <>

app/i18n/api.ts

@@ -1,6 +1,6 @@
 import { Cache } from "react-native-cache";
-import AsyncStorage from '@react-native-async-storage/async-storage';
 import { LIBRETRANSLATE_BASE_URL } from "@/constants/api";
+import AsyncStorage from '@react-native-async-storage/async-storage';
 
 type language_t = string;
 
@@ -35,7 +35,7 @@ export class Translator {
         });
         const data = await res.json();
         return Object.fromEntries(
-            Object.values(data).map((obj : language_matrix_entry) => {
+            Object.values(data as language_matrix_entry []).map((obj : language_matrix_entry) => {
                 return [
                     obj["code"],
                     obj,

app/lib/__test__/conversation.test.tsx

@@ -0,0 +1,32 @@
+// conversation.test.ts
+
+import { Translator } from '@/app/i18n/api';
+import { Conversation, Message, Speaker } from '@/app/lib/conversation';
+import { describe, beforeEach, it, expect, test } from '@jest/globals';
+
+describe('Conversation', () => {
+  let conversation: Conversation;
+
+  beforeEach(() => {
+    const translator = new Translator("en", "sp");
+    const s1: Speaker = { language: "en", id: "s1" };
+    const s2: Speaker = { id: "s2", language: "sp" }
+    conversation = new Conversation(translator, s1, s2);
+  });
+
+  it('should add a message to the conversation', () => {
+    conversation.addMessage({ id: "s1", language: "en" }, "Hello");
+    expect(true).toEqual(false);
+    expect(conversation.length).toBe(1);
+    expect(conversation[0].speaker.id).toEqual("s1");
+    expect(conversation[0].text).toEqual("hello");
+  });
+
+  it('should translate the last message in the conversation', async () => {
+
+    conversation.addMessage({ id: "s1", language: "en" }, "Hello");
+
+    await conversation.translateLast();
+    expect(conversation[conversation.length - 1].translation).toEqual("Hollla");
+  });
+});

app/lib/conversation.ts

@@ -0,0 +1,38 @@
+import { Translator } from "../i18n/api";
+
+export type Speaker = {
+    id: string,
+    language : string,
+}
+
+export class Message {
+    public translation? : string;
+    constructor (public text : string, public speaker : Speaker) {}
+
+    public async translate(translator : Translator, language? : string) {
+        this.translation = await translator.translate(this.text, language);
+    }
+}
+
+export class Conversation extends Array<Message> {
+    constructor (
+        private translator : Translator,
+        s1 : Speaker,
+        s2 : Speaker,
+    ) {
+        super();
+    }
+
+    public addMessage(speaker : Speaker, text : string) {
+        this.push(new Message(text, speaker));
+    }
+
+    public async translateMessage(i : number) {
+        if (!this[i]) throw new Error(`${i} is not a valid message number`);
+        await this[i].translate(this.translator, this[i].speaker.language);
+    }
+
+    public async translateLast() {
+        return await this.translateMessage(this.length-1);
+    }
+}