// 권장하지 않음: 직렬 요청
for (const prompt of prompts) {
  const result = await generateImage(prompt);
  results.push(result);
}
 
// 권장: 병렬 요청
const results = await Promise.all(
  prompts.map(prompt => generateImage(prompt))
);

class GeminiCache {
  constructor(ttl = 3600) {
    this.cache = new Map();
    this.ttl = ttl * 1000;
  }
 
  async get(key, generator) {
    const cached = this.cache.get(key);
 
    if (cached && Date.now() - cached.time < this.ttl) {
      return cached.value;
    }
 
    const value = await generator();
    this.cache.set(key, { value, time: Date.now() });
    return value;
  }
}

async function* streamGeneration(prompt) {
  const stream = await gemini.generateContentStream(prompt);
 
  for await (const chunk of stream) {
    yield chunk.text();
  }
}
 
// 스트림 응답 사용
for await (const text of streamGeneration(prompt)) {
  updateUI(text); // 실시간 UI 업데이트
}

// 최적화 전: 장황한 프롬프트
const prompt = `
  Please generate an image of a cat.
  The cat should be sitting.
  The cat should be orange.
  The background should be a garden.
`;
 
// 최적화 후: 간결한 프롬프트
const prompt = "Orange cat sitting in garden";

async function intelligentGenerate(prompt, complexity) {
  // 작업 복잡성에 따라 모델 선택
  const model = complexity > 0.7
    ? 'gemini-pro'
    : 'gemini-flash';
 
  return await gemini[model].generate(prompt);
}

// 재생성 대신 변형 생성
async function generateVariations(baseResult) {
  const variations = [];
  const seeds = [1, 2, 3, 4];
 
  for (const seed of seeds) {
    variations.push(
      modifyResult(baseResult, { seed })
    );
  }
 
  return variations;
}

async function robustGenerate(prompt, maxRetries = 3) {
  let lastError;
 
  for (let i = 0; i < maxRetries; i++) {
    try {
      return await gemini.generate(prompt);
    } catch (error) {
      lastError = error;
 
      if (error.code === 'RATE_LIMIT') {
        await sleep(Math.pow(2, i) * 1000); // Exponential backoff
      } else if (error.code === 'INVALID_PROMPT') {
        throw error; // Non-retryable error
      }
    }
  }
 
  throw lastError;
}

async function generateWithFallback(prompt) {
  try {
    // 기본 모델 시도
    return await gemini.pro.generate(prompt);
  } catch (error) {
    console.warn('Primary model failed, using fallback');
 
    try {
      // 백업 모델로 다운그레이드
      return await gemini.flash.generate(prompt);
    } catch (fallbackError) {
      // 기본 응답 반환
      return getDefaultResponse();
    }
  }
}

class ContentFilter {
  constructor() {
    this.bannedWords = new Set([...]);
    this.sensitivePatterns = [...];
  }
 
  validate(prompt) {
    // 금지된 단어 확인
    for (const word of this.bannedWords) {
      if (prompt.toLowerCase().includes(word)) {
        throw new Error('Inappropriate content detected');
      }
    }
 
    // 민감한 패턴 확인
    for (const pattern of this.sensitivePatterns) {
      if (pattern.test(prompt)) {
        return this.sanitize(prompt);
      }
    }
 
    return prompt;
  }
}

class RateLimiter {
  constructor(maxRequests = 60, window = 60000) {
    this.requests = [];
    this.maxRequests = maxRequests;
    this.window = window;
  }
 
  async acquire() {
    const now = Date.now();
 
    // 만료된 요청 정리
    this.requests = this.requests.filter(
      time => now - time < this.window
    );
 
    if (this.requests.length >= this.maxRequests) {
      const oldestRequest = this.requests[0];
      const waitTime = this.window - (now - oldestRequest);
      await sleep(waitTime);
      return this.acquire();
    }
 
    this.requests.push(now);
  }
}

class PerformanceMonitor {
  async track(operation, fn) {
    const start = performance.now();
    const result = await fn();
    const duration = performance.now() - start;
 
    this.log({
      operation,
      duration,
      timestamp: new Date(),
      success: true
    });
 
    return result;
  }
 
  getStatistics() {
    return {
      avgResponseTime: this.calculateAverage(),
      p95ResponseTime: this.calculatePercentile(95),
      successRate: this.calculateSuccessRate()
    };
  }
}

class GeminiLogger {
  log(level, message, metadata = {}) {
    const logEntry = {
      timestamp: new Date().toISOString(),
      level,
      message,
      ...metadata,
      environment: process.env.NODE_ENV
    };
 
    if (level === 'error') {
      this.sendToMonitoring(logEntry);
    }
 
    console.log(JSON.stringify(logEntry));
  }
}

async function generateWithProgress(prompt, onProgress) {
  onProgress({ stage: 'validating', progress: 0 });
  await validatePrompt(prompt);
 
  onProgress({ stage: 'generating', progress: 30 });
  const result = await gemini.generate(prompt);
 
  onProgress({ stage: 'processing', progress: 70 });
  const processed = await postProcess(result);
 
  onProgress({ stage: 'complete', progress: 100 });
  return processed;
}

class PredictiveLoader {
  async preload(userBehavior) {
    const likelyPrompts = this.predictNextPrompts(userBehavior);
 
    // 캐시 워밍
    for (const prompt of likelyPrompts) {
      this.cache.warm(prompt);
    }
  }
}

// config/gemini.js
export const geminiConfig = {
  development: {
    apiKey: process.env.GEMINI_DEV_KEY,
    model: 'gemini-flash',
    maxRetries: 5,
    timeout: 30000
  },
  production: {
    apiKey: process.env.GEMINI_PROD_KEY,
    model: 'gemini-pro',
    maxRetries: 3,
    timeout: 15000
  }
};

class GeminiService {
  constructor(config, cache, logger) {
    this.config = config;
    this.cache = cache;
    this.logger = logger;
    this.client = new GeminiClient(config);
  }
 
  async generate(prompt, options = {}) {
    const cacheKey = this.getCacheKey(prompt, options);
 
    return await this.cache.get(cacheKey, async () => {
      this.logger.log('info', 'Generating content', { prompt });
      return await this.client.generate(prompt, options);
    });
  }
}

describe('GeminiService', () => {
  it('should cache repeated requests', async () => {
    const service = new GeminiService(mockConfig);
 
    const result1 = await service.generate('test prompt');
    const result2 = await service.generate('test prompt');
 
    expect(result1).toBe(result2);
    expect(mockClient.generate).toHaveBeenCalledTimes(1);
  });
});

describe('Gemini Integration', () => {
  it('should handle rate limits gracefully', async () => {
    const promises = Array(100).fill(null).map(() =>
      service.generate('test')
    );
 
    const results = await Promise.allSettled(promises);
    const successful = results.filter(r => r.status === 'fulfilled');
 
    expect(successful.length).toBeGreaterThan(0);
  });
});