562 lines
23 KiB
TypeScript
562 lines
23 KiB
TypeScript
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import { GoogleGenAI, Modality, Type } from "@google/genai";
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import { PronunciationFeedback, Language, ReadingLesson, ReadingDifficulty, OCRAnalysis, ListeningLesson } from "../types";
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import { base64ToUint8Array, uint8ArrayToBase64 } from "../utils/audioUtils";
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export const USER_API_KEY_STORAGE = 'sakura_user_api_key';
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export const USER_BASE_URL_STORAGE = 'sakura_user_base_url';
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// Helper to decode audio for playback
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// Updated to support raw PCM (typically returned by Gemini TTS) which browser cannot decode automatically
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export const decodeAudioData = async (
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base64Data: string,
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audioContext: AudioContext
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): Promise<AudioBuffer> => {
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const binaryString = atob(base64Data);
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const len = binaryString.length;
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const bytes = new Uint8Array(len);
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for (let i = 0; i < len; i++) {
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bytes[i] = binaryString.charCodeAt(i);
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}
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try {
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// Try standard decoding first (wav/mp3 containers)
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// We clone the buffer because decodeAudioData detaches it
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return await audioContext.decodeAudioData(bytes.buffer.slice(0));
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} catch (e) {
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// Fallback: Treat as raw PCM (16-bit, 24kHz default for Gemini TTS, or 16kHz)
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// Assuming 24kHz Mono 16-bit Little Endian based on typical Gemini TTS raw output
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const pcmData = new Int16Array(bytes.buffer);
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const float32Data = new Float32Array(pcmData.length);
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for (let i = 0; i < pcmData.length; i++) {
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// Convert int16 to float32 (-1.0 to 1.0)
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float32Data[i] = pcmData[i] / 32768.0;
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}
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// Create buffer: 1 channel, length, 24000 sample rate
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const audioBuffer = audioContext.createBuffer(1, float32Data.length, 24000);
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audioBuffer.getChannelData(0).set(float32Data);
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return audioBuffer;
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}
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};
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// Helper to check/request Veo key
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export const ensureVeoKey = async (): Promise<void> => {
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// @ts-ignore
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if (window.aistudio) {
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// @ts-ignore
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const hasKey = await window.aistudio.hasSelectedApiKey();
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if (!hasKey) {
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// @ts-ignore
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await window.aistudio.openSelectKey();
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}
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}
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};
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const LANGUAGE_MAP = {
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en: "English",
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ja: "Japanese",
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zh: "Chinese (Simplified)"
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};
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class GeminiService {
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private getAi() {
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const userKey = localStorage.getItem(USER_API_KEY_STORAGE);
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let userBaseUrl = localStorage.getItem(USER_BASE_URL_STORAGE);
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const envKey = process.env.API_KEY;
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const keyToUse = (userKey && userKey.trim().length > 0) ? userKey : envKey;
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if (!keyToUse) {
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console.error("API_KEY is missing.");
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throw new Error("API Key is missing");
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}
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const config: any = { apiKey: keyToUse };
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if (userBaseUrl && userBaseUrl.trim().length > 0) {
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// Sanitize Base URL: remove quotes and trailing slashes
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let cleanUrl = userBaseUrl.trim().replace(/['"]/g, '').replace(/\/+$/, '');
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config.baseUrl = cleanUrl;
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}
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return new GoogleGenAI(config);
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}
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private async getApiKey(): Promise<string> {
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const userKey = localStorage.getItem(USER_API_KEY_STORAGE);
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const envKey = process.env.API_KEY;
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const key = (userKey && userKey.trim().length > 0) ? userKey : envKey;
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if (!key) throw new Error("No API Key available");
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return key;
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}
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private async retryOperation<T>(operation: () => Promise<T>, retries = 3, delay = 1000): Promise<T> {
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try {
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return await operation();
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} catch (error: any) {
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const errorMsg = error?.message || '';
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// Check for Network/CORS/Proxy errors specifically
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if (errorMsg.includes('Failed to fetch') || errorMsg.includes('NetworkError')) {
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console.error("Network Error Detected:", error);
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throw new Error("Network connection failed. Please check your Base URL (Proxy) settings or internet connection.");
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}
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const isOverloaded =
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error?.status === 503 ||
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error?.response?.status === 503 ||
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errorMsg.includes('503') ||
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errorMsg.includes('overloaded');
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if (isOverloaded && retries > 0) {
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console.warn(`Model overloaded (503). Retrying...`);
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await new Promise(resolve => setTimeout(resolve, delay));
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return this.retryOperation(operation, retries - 1, delay * 2);
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}
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throw error;
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}
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}
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// 1. Text Chat Response - Returns { text, model }
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async generateTextResponse(
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prompt: string,
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imageBase64?: string,
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useThinking: boolean = false,
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language: Language = 'en',
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modelOverride?: string,
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aiSpeakingLanguage: 'ja' | 'native' = 'native'
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): Promise<{ text: string, model: string }> {
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const ai = this.getAi();
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// Ensure model name is clean
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let modelName = useThinking
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? 'gemini-3-pro-preview'
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: (imageBase64 ? 'gemini-3-pro-preview' : (modelOverride || 'gemini-2.5-flash'));
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// Extra safety: strip quotes just in case
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modelName = modelName.replace(/['"]/g, '');
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const targetLangName = LANGUAGE_MAP[language];
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const parts: any[] = [];
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if (imageBase64) {
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parts.push({
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inlineData: {
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mimeType: 'image/jpeg',
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data: imageBase64
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}
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});
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parts.push({ text: `Analyze this image in the context of learning Japanese. Explain in ${targetLangName}: ` + prompt });
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} else {
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parts.push({ text: prompt });
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}
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let instruction = "";
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if (aiSpeakingLanguage === 'ja') {
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instruction = `You are Sakura, a Japanese language tutor.
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IMPORTANT:
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- Respond primarily in Japanese (日本語) to help the user practice immersion.
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- Only use ${targetLangName} for complex grammar explanations or if the user asks specifically for a translation.
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- Keep the tone encouraging and natural.`;
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} else {
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instruction = `You are Sakura, a friendly, encouraging, and highly skilled Japanese language tutor. You help users learn vocabulary, grammar, listening, and speaking. You provide clear explanations, examples, and translations.
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IMPORTANT:
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- You are teaching Japanese.
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- However, the user speaks ${targetLangName}.
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- Provide your explanations, translations, and feedback in ${targetLangName}.`;
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}
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const config: any = {
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systemInstruction: instruction,
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};
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if (useThinking) {
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config.thinkingConfig = { thinkingBudget: 32768 };
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}
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return this.retryOperation(async () => {
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const response = await ai.models.generateContent({
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model: modelName,
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contents: { parts },
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config: config
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});
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return {
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text: response.text || "I apologize, I couldn't generate a response.",
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model: modelName
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};
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});
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}
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// Internal helper for single TTS chunk
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private async _generateSpeechChunk(text: string): Promise<string | null> {
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const ai = this.getAi();
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return this.retryOperation(async () => {
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try {
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash-preview-tts',
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contents: [{ parts: [{ text }] }],
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config: {
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responseModalities: [Modality.AUDIO],
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speechConfig: {
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voiceConfig: { prebuiltVoiceConfig: { voiceName: 'Kore' } },
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},
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},
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});
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return response.candidates?.[0]?.content?.parts?.[0]?.inlineData?.data || null;
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} catch (e) {
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console.error("TTS Chunk Error", e);
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throw e; // Throw to retryOperation to handle network errors
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}
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});
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}
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async generateSpeech(text: string): Promise<string | null> {
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if (!text || !text.trim()) return null;
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const MAX_CHUNK_LENGTH = 250; // Safe limit to prevent network timeout on long generation
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// If text is short, process directly
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if (text.length <= MAX_CHUNK_LENGTH) {
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try {
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return await this._generateSpeechChunk(text);
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} catch (e) {
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return null;
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}
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}
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// Split text into chunks by sentence to avoid breaking words
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const regex = /[^。！？.!?\n]+[。！？.!?\n]*|[^。！？.!?\n]+$/g;
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const sentences = text.match(regex) || [text];
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const chunks: string[] = [];
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let currentChunk = '';
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for (const sentence of sentences) {
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if ((currentChunk + sentence).length > MAX_CHUNK_LENGTH) {
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if (currentChunk) chunks.push(currentChunk);
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currentChunk = sentence;
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// Force split if a single sentence exceeds max length
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while (currentChunk.length > MAX_CHUNK_LENGTH) {
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chunks.push(currentChunk.slice(0, MAX_CHUNK_LENGTH));
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currentChunk = currentChunk.slice(MAX_CHUNK_LENGTH);
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}
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} else {
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currentChunk += sentence;
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}
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}
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if (currentChunk) chunks.push(currentChunk);
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try {
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// Generate chunks in parallel to speed up total time
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// Note: Promise.all order is preserved
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const results = await Promise.all(chunks.map(chunk => this._generateSpeechChunk(chunk)));
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// If any chunk failed, the whole audio is compromised
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if (results.some(r => r === null)) return null;
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// Convert Base64 -> Uint8Array
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const audioSegments = results.map(r => base64ToUint8Array(r!));
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// Concatenate raw PCM data
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const totalLength = audioSegments.reduce((acc, cur) => acc + cur.length, 0);
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const combined = new Uint8Array(totalLength);
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let offset = 0;
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for (const seg of audioSegments) {
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combined.set(seg, offset);
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offset += seg.length;
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}
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// Convert back to Base64 for playback/storage
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return uint8ArrayToBase64(combined);
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} catch (e) {
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console.error("TTS Assembly Error", e);
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return null;
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}
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}
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async transcribeAudio(audioBase64: string): Promise<string> {
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const ai = this.getAi();
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return this.retryOperation(async () => {
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash',
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contents: {
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parts: [
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{ inlineData: { mimeType: 'audio/wav', data: audioBase64 } },
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{ text: "Transcribe accurately." },
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],
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},
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});
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return response.text || "";
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});
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}
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async generateImage(prompt: string): Promise<string | null> {
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const ai = this.getAi();
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return this.retryOperation(async () => {
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try {
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const response = await ai.models.generateImages({
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model: 'imagen-4.0-generate-001',
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prompt: prompt + " style of a japanese textbook illustration",
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config: { numberOfImages: 1, outputMimeType: 'image/jpeg', aspectRatio: '1:1' },
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});
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const bytes = response.generatedImages?.[0]?.image?.imageBytes;
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return bytes ? `data:image/jpeg;base64,${bytes}` : null;
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} catch (e) {
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console.error("Image Gen Error", e);
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throw e;
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}
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});
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}
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async editImage(base64Original: string, prompt: string): Promise<string | null> {
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const ai = this.getAi();
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return this.retryOperation(async () => {
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try {
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const cleanBase64 = base64Original.replace(/^data:image\/(png|jpeg|jpg|webp|heic|heif);base64,/i, "");
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash-image',
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contents: {
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parts: [
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{ inlineData: { data: cleanBase64, mimeType: 'image/jpeg' } },
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{ text: prompt }
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]
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},
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config: { responseModalities: [Modality.IMAGE] }
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});
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for (const part of response.candidates?.[0]?.content?.parts || []) {
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if (part.inlineData) return `data:image/png;base64,${part.inlineData.data}`;
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}
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return null;
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} catch (e) {
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console.error("Image Edit Error", e);
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throw e;
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}
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});
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}
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async generateVideo(prompt: string, onStatusUpdate: (status: string) => void): Promise<string | null> {
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await ensureVeoKey();
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const ai = this.getAi();
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try {
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onStatusUpdate("Initializing Veo...");
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let operation = await ai.models.generateVideos({
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model: 'veo-3.1-fast-generate-preview',
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prompt: prompt,
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config: { numberOfVideos: 1, resolution: '720p', aspectRatio: '16:9' }
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});
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onStatusUpdate("Dreaming up video...");
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while (!operation.done) {
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await new Promise(resolve => setTimeout(resolve, 5000));
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operation = await ai.operations.getVideosOperation({ operation: operation });
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}
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const videoUri = operation.response?.generatedVideos?.[0]?.video?.uri;
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if (!videoUri) return null;
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const apiKey = await this.getApiKey();
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const videoRes = await fetch(`${videoUri}&key=${apiKey}`);
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const blob = await videoRes.blob();
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return URL.createObjectURL(blob);
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} catch (e) {
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console.error("Veo Error", e);
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return null;
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}
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}
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async analyzeSpeakingPerformance(audioBase64: string, scenarioContext: string, historyContext: string, language: Language = 'en'): Promise<PronunciationFeedback | null> {
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const ai = this.getAi();
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const targetLangName = LANGUAGE_MAP[language];
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const prompt = `Roleplay: ${scenarioContext}. History: ${historyContext}. Listen, Transcribe, Reply, Evaluate (JSON). Translation/Advice in ${targetLangName}.`;
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return this.retryOperation(async () => {
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash',
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contents: {
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parts: [{ inlineData: { mimeType: 'audio/wav', data: audioBase64 } }, { text: prompt }]
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},
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config: {
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responseMimeType: "application/json",
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responseSchema: {
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type: Type.OBJECT,
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properties: {
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transcription: { type: Type.STRING },
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response: { type: Type.STRING },
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translation: { type: Type.STRING },
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score: { type: Type.INTEGER },
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pronunciationIssues: { type: Type.ARRAY, items: { type: Type.STRING } },
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advice: { type: Type.STRING }
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},
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required: ["transcription", "response", "translation", "score", "pronunciationIssues", "advice"]
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}
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}
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});
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return response.text ? JSON.parse(response.text) : null;
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});
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}
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async generateReadingLesson(topic: string, difficulty: ReadingDifficulty, language: Language): Promise<ReadingLesson | null> {
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const ai = this.getAi();
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const targetLangName = LANGUAGE_MAP[language];
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const prompt = `Create a complete Japanese reading lesson on "${topic}", level ${difficulty}.
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The 'japaneseContent' MUST be a complete article or story (at least 300 characters).
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Output JSON with title, japaneseContent, translation (${targetLangName}), vocabulary, and grammarPoints (list of key grammar used in the text with explanations).`;
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return this.retryOperation(async () => {
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash',
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contents: { parts: [{ text: prompt }] },
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config: {
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responseMimeType: "application/json",
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responseSchema: {
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type: Type.OBJECT,
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properties: {
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title: { type: Type.STRING },
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japaneseContent: { type: Type.STRING },
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translation: { type: Type.STRING },
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vocabulary: { type: Type.ARRAY, items: { type: Type.OBJECT, properties: { word: { type: Type.STRING }, reading: { type: Type.STRING }, meaning: { type: Type.STRING } } } },
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grammarPoints: { type: Type.ARRAY, items: { type: Type.OBJECT, properties: { point: { type: Type.STRING }, explanation: { type: Type.STRING } } } }
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},
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required: ["title", "japaneseContent", "translation", "vocabulary", "grammarPoints"]
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}
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}
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});
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return response.text ? JSON.parse(response.text) : null;
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});
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}
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async generateListeningLesson(topic: string, difficulty: ReadingDifficulty, language: Language): Promise<ListeningLesson | null> {
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const ai = this.getAi();
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const targetLangName = LANGUAGE_MAP[language];
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// Prompt asks for a conversation or monologue suitable for listening practice
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const prompt = `Create a Japanese listening practice script on "${topic}", level ${difficulty}. It should be a conversation or monologue.
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Output JSON with:
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- title
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- script (The full Japanese text of the conversation/monologue)
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- translation (The full text in ${targetLangName})
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- vocabulary (Key words)
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- questions (3 multiple choice comprehension questions in ${targetLangName})
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- Each question needs: question, options (array of 3 strings), correctIndex (0-2), explanation.
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`;
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return this.retryOperation(async () => {
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const response = await ai.models.generateContent({
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model: 'gemini-2.5-flash',
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contents: { parts: [{ text: prompt }] },
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config: {
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responseMimeType: "application/json",
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responseSchema: {
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type: Type.OBJECT,
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properties: {
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title: { type: Type.STRING },
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script: { type: Type.STRING },
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translation: { type: Type.STRING },
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vocabulary: { type: Type.ARRAY, items: { type: Type.OBJECT, properties: { word: { type: Type.STRING }, reading: { type: Type.STRING }, meaning: { type: Type.STRING } } } },
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questions: {
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type: Type.ARRAY,
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items: {
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type: Type.OBJECT,
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properties: {
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id: { type: Type.STRING },
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question: { type: Type.STRING },
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options: { type: Type.ARRAY, items: { type: Type.STRING } },
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correctIndex: { type: Type.INTEGER },
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explanation: { type: Type.STRING }
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},
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required: ["question", "options", "correctIndex", "explanation"]
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}
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}
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},
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required: ["title", "script", "translation", "vocabulary", "questions"]
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}
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}
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});
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return response.text ? JSON.parse(response.text) : null;
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});
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}
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async generateReadingTutorResponse(question: string, lesson: ReadingLesson | ListeningLesson, history: string, language: Language): Promise<string> {
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const ai = this.getAi();
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// Handle both ReadingLesson (japaneseContent) and ListeningLesson (script)
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const content = 'japaneseContent' in lesson ? lesson.japaneseContent : lesson.script;
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const prompt = `Tutor for text "${lesson.title}". Question: "${question}". History: ${history}. Explain in ${LANGUAGE_MAP[language]}.`;
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return this.retryOperation(async () => {
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const res = await ai.models.generateContent({
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model: 'gemini-2.5-flash',
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contents: { parts: [{ text: prompt }] }
|
|
});
|
|
return res.text || "";
|
|
});
|
|
}
|
|
|
|
async translateText(text: string, target: string, source: string = "Auto"): Promise<string> {
|
|
const ai = this.getAi();
|
|
return this.retryOperation(async () => {
|
|
const res = await ai.models.generateContent({
|
|
model: 'gemini-2.5-flash',
|
|
contents: { parts: [{ text: `Translate the following text from ${source} to ${target}.` }, { text: text }] },
|
|
config: {
|
|
responseMimeType: "application/json",
|
|
responseSchema: {
|
|
type: Type.OBJECT,
|
|
properties: { translation: { type: Type.STRING } },
|
|
required: ["translation"]
|
|
}
|
|
}
|
|
});
|
|
return (res.text ? JSON.parse(res.text).translation : "") || "";
|
|
});
|
|
}
|
|
|
|
async translateImage(base64: string, target: string, source: string = "Auto"): Promise<{ original: string; translated: string } | null> {
|
|
const ai = this.getAi();
|
|
const cleanBase64 = base64.replace(/^data:image\/(png|jpeg|jpg|webp|heic|heif);base64,/i, "");
|
|
return this.retryOperation(async () => {
|
|
const res = await ai.models.generateContent({
|
|
model: 'gemini-2.5-flash',
|
|
contents: {
|
|
parts: [{ inlineData: { mimeType: 'image/jpeg', data: cleanBase64 } }, { text: `Extract text (Language: ${source}) and translate to ${target}. JSON output: original, translated.` }]
|
|
},
|
|
config: {
|
|
responseMimeType: "application/json",
|
|
responseSchema: {
|
|
type: Type.OBJECT,
|
|
properties: { original: { type: Type.STRING }, translated: { type: Type.STRING } },
|
|
required: ["original", "translated"]
|
|
}
|
|
}
|
|
});
|
|
return res.text ? JSON.parse(res.text) : null;
|
|
});
|
|
}
|
|
|
|
async extractAndAnalyzeText(base64: string, language: Language): Promise<OCRAnalysis | null> {
|
|
const ai = this.getAi();
|
|
const cleanBase64 = base64.replace(/^data:image\/(png|jpeg|jpg|webp|heic|heif);base64,/i, "");
|
|
const targetLang = LANGUAGE_MAP[language];
|
|
const prompt = `OCR and analyze text. Explain in ${targetLang}. JSON: extractedText, detectedLanguage, summary, vocabulary, grammarPoints.`;
|
|
|
|
return this.retryOperation(async () => {
|
|
const res = await ai.models.generateContent({
|
|
model: 'gemini-2.5-flash',
|
|
contents: {
|
|
parts: [{ inlineData: { mimeType: 'image/jpeg', data: cleanBase64 } }, { text: prompt }]
|
|
},
|
|
config: {
|
|
responseMimeType: "application/json",
|
|
responseSchema: {
|
|
type: Type.OBJECT,
|
|
properties: {
|
|
extractedText: { type: Type.STRING },
|
|
detectedLanguage: { type: Type.STRING },
|
|
summary: { type: Type.STRING },
|
|
vocabulary: { type: Type.ARRAY, items: { type: Type.OBJECT, properties: { word: { type: Type.STRING }, reading: { type: Type.STRING }, meaning: { type: Type.STRING } } } },
|
|
grammarPoints: { type: Type.ARRAY, items: { type: Type.OBJECT, properties: { point: { type: Type.STRING }, explanation: { type: Type.STRING } } } }
|
|
},
|
|
required: ["extractedText", "detectedLanguage", "summary", "vocabulary", "grammarPoints"]
|
|
}
|
|
}
|
|
});
|
|
return res.text ? JSON.parse(res.text) : null;
|
|
});
|
|
}
|
|
}
|
|
|
|
export const geminiService = new GeminiService();
|