market_screener/server/domains/screener/analyze.controller.ts

import type { FastifyInstance, FastifyRequest, FastifyReply } from 'fastify';
import type { LLMAnalyst } from '../../domains/shared';
import { CatalystCache, CatalystAnalyst } from '../../domains/shared';
import { analyzeSchema } from '../../domains/shared/types/schemas';

export class AnalyzeController {
  private readonly catalystAnalyst: CatalystAnalyst;

  constructor(
    private readonly catalystCache: CatalystCache,
    private readonly llm: LLMAnalyst,
  ) {
    // Create a fresh instance for per-ticker story fetching (not cached)
    this.catalystAnalyst = new CatalystAnalyst();
  }

  register(app: FastifyInstance): void {
    app.post(
      '/api/analyze',
      { schema: analyzeSchema, config: { rateLimit: { max: 10, timeWindow: '1 minute' } } },
      this.analyze.bind(this),
    );
  }

  private async analyze(req: FastifyRequest, reply: FastifyReply) {
    if (!this.llm.isAvailable) {
      return reply.code(400).send({ error: 'ANTHROPIC_API_KEY is not set in .env' });
    }

    const tickers = (req.body as { tickers: string[] }).tickers.map((t) => t.toUpperCase());

    const stories = await this.catalystAnalyst.fetchStoriesForTickers(tickers);
    if (!stories.length) return reply.code(200).send({ analysis: null, reason: 'no_stories' });

    const { tickerFrequency } = CatalystAnalyst.rankTickers(stories);
    const analysis = await this.llm.analyze(stories, tickers, tickerFrequency);
    return { analysis };
  }
}