import { AdapterError } from "@/domain/spreadsheet-adapter/errors";
import { assertStorageKey } from "@/domain/spreadsheet-adapter/filenames";

export interface ObjectStorage {
  put(key: string, body: Buffer): Promise<void>;
  get(key: string): Promise<Buffer>;
  delete(key: string): Promise<void>;
  /** Listagem completa do prefixo. Implementações remotas devem paginar. */
  list(prefix: string): Promise<string[]>;
  /** Verdadeiro quando o bucket responde. Usado pelo health check. */
  healthcheck(): Promise<boolean>;
}

export class MemoryStorage implements ObjectStorage {
  private readonly objects = new Map<string, Buffer>();

  async put(key: string, body: Buffer): Promise<void> {
    assertStorageKey(key);
    this.objects.set(key, Buffer.from(body));
  }

  async get(key: string): Promise<Buffer> {
    assertStorageKey(key);
    const value = this.objects.get(key);
    if (!value) throw new AdapterError("NOT_FOUND", "Arquivo não encontrado.", 404);
    return Buffer.from(value);
  }

  async delete(key: string): Promise<void> {
    assertStorageKey(key);
    this.objects.delete(key);
  }

  async list(prefix: string): Promise<string[]> {
    return [...this.objects.keys()].filter((key) => key.startsWith(prefix));
  }

  async healthcheck(): Promise<boolean> {
    return true;
  }
}