import { Injectable } from '@nestjs/common';
import { RateLimitStore } from './ports/rate-limit.store';

/** Proposals from one address within the window. */
const LIMIT = 5;
const WINDOW_MS = 15 * 60_000;

/**
 * Keeps one address from flooding a project with proposals. Counted in
 * Redis, so the limit holds across every instance of the API.
 */
@Injectable()
export class ProposalQuota {
  constructor(private readonly store: RateLimitStore) {}

  /** Counts one more proposal from `address`; false once it is over. */
  async take(address: string): Promise<boolean> {
    const count = await this.store.hit(`proposals:${address}`, WINDOW_MS);
    return count <= LIMIT;
  }
}