import type { FastifyInstance, FastifyRequest } from 'fastify';
import { DigestService } from './DigestService';

/**
 * On-demand digest read (P1.1). The scheduled path is bin/daily-digest.ts;
 * this endpoint lets the UI (or curl) build the same report any time.
 */
export class DigestController {
  constructor(private readonly digest: DigestService) {}

  register(app: FastifyInstance): void {
    app.get('/api/digest', this.today.bind(this));
  }

  /** GET /api/digest?date=YYYY-MM-DD (defaults to today) */
  private async today(req: FastifyRequest) {
    const { date } = req.query as { date?: string };
    const day =
      date && /^\d{4}-\d{2}-\d{2}$/.test(date) ? date : new Date().toISOString().slice(0, 10);
    return this.digest.build(day);
  }
}