import { BadRequestException } from '@nestjs/common';

import { ContractTransitionService } from './contract-transition.service';

/**
 * The staff signature seals with the ONE global stamp by REFERENCE: the
 * signature row stores the current global stampFileId instead of re-uploading
 * a copy per contract. That id stays valid after the stamp is replaced
 * (StampSettingsService never deletes retired stamp files), so each contract
 * keeps the exact seal it was signed with. These specs pin the sourcing
 * split: EDR always seals with the global stamp and staff never supply one,
 * while the customer must upload their own.
 */
describe('applySignature stamp sourcing', () => {
  const contract = { id: 'c-1', reference: 'CTR-1', status: 'SIGNED_CUSTOMER' };
  const GLOBAL_STAMP = 'data:image/png;base64,RURS';
  const GLOBAL_STAMP_FILE_ID = 'file-global-stamp';

  const build = (globalStampFileId: string | null = GLOBAL_STAMP_FILE_ID) => {
    const uploads: Array<{ code: string; image: string }> = [];
    const saved: unknown[] = [];
    const service = Object.create(
      ContractTransitionService.prototype,
    ) as ContractTransitionService;
    Object.assign(service, {
      logger: { warn: jest.fn(), log: jest.fn() },
      stampSettings: {
        get: jest.fn().mockResolvedValue({
          id: 's-1',
          stampFileId: globalStampFileId,
        }),
      },
      contractsRepository: {
        saveSignature: jest.fn((row: unknown) => {
          saved.push(row);
          return Promise.resolve(undefined);
        }),
      },
      signaturesService: {
        getForUser: jest.fn().mockResolvedValue(null),
        upsertForUser: jest.fn().mockResolvedValue(undefined),
      },
      uploadSignatureAsset: jest.fn((_c: unknown, code: string, image: string) => {
        uploads.push({ code, image });
        return Promise.resolve({ id: `file-${code}` });
      }),
    });
    return { service, uploads, saved };
  };

  const apply = (
    service: ContractTransitionService,
    dto: Record<string, unknown>,
  ) =>
    (
      service as unknown as {
        applySignature(
          c: unknown,
          d: unknown,
          o: { signerUserId?: string },
        ): Promise<void>;
      }
    ).applySignature(contract, dto, { signerUserId: 'u-1' });

  const staffDto = {
    role: 'STAFF' as const,
    signerDisplayName: 'E. Staff',
    signatureImageBase64: 'data:image/png;base64,U0lH',
  };

  it('seals the EDR side by referencing the global stamp file, without re-uploading it', async () => {
    const { service, uploads, saved } = build();

    await apply(service, staffDto);

    expect(uploads.map((u) => u.code)).toEqual(['signature_staff']);
    expect(saved[0]).toEqual(
      expect.objectContaining({ stampFileId: GLOBAL_STAMP_FILE_ID }),
    );
  });

  it('ignores a stamp a staff client tries to supply', async () => {
    const { service, uploads, saved } = build();

    await apply(service, {
      ...staffDto,
      stampImageBase64: 'data:image/png;base64,SEFDSw==',
    });

    expect(uploads.map((u) => u.image)).not.toContain(
      'data:image/png;base64,SEFDSw==',
    );
    expect(saved[0]).toEqual(
      expect.objectContaining({ stampFileId: GLOBAL_STAMP_FILE_ID }),
    );
  });

  /**
   * Failing loudly matters here: silently executing an unsealed contract
   * would be worse than refusing to counter-sign.
   */
  it('refuses to counter-sign when no global stamp is configured', async () => {
    const { service, saved } = build(null);

    await expect(apply(service, staffDto)).rejects.toBeInstanceOf(
      BadRequestException,
    );
    await expect(apply(service, staffDto)).rejects.toThrow(/company stamp is configured/i);
    expect(saved).toHaveLength(0);
  });

  it('requires the customer to upload their own stamp', async () => {
    const { service, saved } = build();

    await expect(
      apply(service, {
        role: 'CUSTOMER',
        signerDisplayName: 'C. Customer',
        signatureImageBase64: 'data:image/png;base64,U0lH',
      }),
    ).rejects.toThrow(/company stamp is required/i);
    expect(saved).toHaveLength(0);
  });

  it('snapshots the customer stamp and never substitutes the global one', async () => {
    const { service, uploads } = build();
    const customerStamp = 'data:image/png;base64,Q1VTVA==';

    await apply(service, {
      role: 'CUSTOMER',
      signerDisplayName: 'C. Customer',
      signatureImageBase64: 'data:image/png;base64,U0lH',
      stampImageBase64: customerStamp,
    });

    expect(uploads).toContainEqual({
      code: 'stamp_customer',
      image: customerStamp,
    });
    expect(uploads.map((u) => u.image)).not.toContain(GLOBAL_STAMP);
  });

  /**
   * DIRECTOR/CEO rows are internal approval signatures, not party seals, so
   * they are deliberately exempt from the stamp requirement.
   */
  it('lets internal approval signatures through without any stamp', async () => {
    const { service, uploads, saved } = build();

    await apply(service, {
      role: 'DIRECTOR',
      signerDisplayName: 'D. Director',
      signatureImageBase64: 'data:image/png;base64,U0lH',
    });

    expect(uploads.map((u) => u.code)).toEqual(['signature_director']);
    expect(saved[0]).toEqual(expect.objectContaining({ stampFileId: null }));
  });
});