import { ContractViewModelBuilder, ContractSignatureView } from "./contract-view-model.builder";

/**
 * The EDR side of a contract is sealed with the ONE global company stamp, read
 * live at render time; the client side keeps whatever stamp the customer
 * uploaded. These specs pin that asymmetry — the standing rule is that
 * centralizing the EDR seal must not touch customer stamps.
 */
describe("ContractViewModelBuilder.attachProviderStamp", () => {
  const STAMP = "data:image/png;base64,RURS";

  const build = (stampImageUrl: string | null = STAMP) => {
    const getStampImageUrl = jest.fn().mockResolvedValue(stampImageUrl);
    const builder = Object.create(
      ContractViewModelBuilder.prototype,
    ) as ContractViewModelBuilder;
    Object.assign(builder, { stampSettings: { getStampImageUrl } });
    return { builder, getStampImageUrl };
  };

  const sig = (role: "STAFF" | "CUSTOMER", extra: Partial<ContractSignatureView> = {}) =>
    ({
      role,
      signerDisplayName: `${role} signer`,
      signedAt: "1 January 2026",
      signatureImageUrl: "https://minio.local/sig.png",
      ...extra,
    }) as ContractSignatureView;

  it("stamps the EDR side with the global stamp", async () => {
    const { builder } = build();
    const signatures = [sig("STAFF")];

    await builder.attachProviderStamp(signatures);

    expect(signatures[0]!.stampImageUrl).toBe(STAMP);
  });

  it("leaves the customer side untouched", async () => {
    const { builder } = build();
    const customerStamp = "data:image/png;base64,Q1VTVA==";
    const signatures = [
      sig("CUSTOMER", { stampImageUrl: customerStamp }),
      sig("STAFF"),
    ];

    await builder.attachProviderStamp(signatures);

    expect(signatures[0]!.stampImageUrl).toBe(customerStamp);
    expect(signatures[1]!.stampImageUrl).toBe(STAMP);
  });

  it("does not read the stamp at all when EDR has not signed yet", async () => {
    const { builder, getStampImageUrl } = build();
    const signatures = [sig("CUSTOMER")];

    await builder.attachProviderStamp(signatures);

    expect(getStampImageUrl).not.toHaveBeenCalled();
    expect(signatures[0]!.stampImageUrl).toBeUndefined();
  });

  it("renders unstamped rather than failing when no stamp is configured", async () => {
    const { builder } = build(null);
    const signatures = [sig("STAFF")];

    await expect(builder.attachProviderStamp(signatures)).resolves.toBeUndefined();
    expect(signatures[0]!.stampImageUrl).toBeNull();
  });

  it("reads the stamp once for every EDR signature row", async () => {
    const { builder, getStampImageUrl } = build();
    const signatures = [sig("STAFF"), sig("STAFF")];

    await builder.attachProviderStamp(signatures);

    expect(getStampImageUrl).toHaveBeenCalledTimes(1);
    expect(signatures.map((s) => s.stampImageUrl)).toEqual([STAMP, STAMP]);
  });

  it("is applied by loadSignatures, so the HTML view and the PDF agree", async () => {
    const { builder } = build();
    Object.assign(builder, {
      bookingsRepository: {
        findContractSignatures: jest.fn().mockResolvedValue([
          { signerRole: "STAFF", signerDisplayName: "EDR", signedAt: new Date() },
        ]),
      },
    });

    const views = await (
      builder as unknown as {
        loadSignatures(id: string): Promise<ContractSignatureView[]>;
      }
    ).loadSignatures("b-1");

    expect(views[0]!.stampImageUrl).toBe(STAMP);
  });
});