import { INestApplication } from "@nestjs/common";
import { Readable } from "node:stream";
import { PDFDocument } from "pdf-lib";
import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
import { agent, bearer, closeTestApp, createTestApp, loginSuperAdmin, qaEmail, type AuthedTokens } from "./setup.js";

/**
 * Full e-signature envelope lifecycle, end to end through the real HTTP
 * API — the same rigor as documents-pdf.spec.ts/anatel-pdf.spec.ts, but
 * this module is security-critical enough to warrant covering the WHOLE
 * state machine in one connected flow (create → send → per-signer public
 * flow → sign → seal checkpoint → finalize → public verify), not just
 * isolated units. `renderPdf`/`uploadObject`/`getObjectStream`/`sendMail`
 * are mocked (an in-memory S3 substitute + captured emails) so the suite
 * doesn't need a real Chromium/MinIO/SMTP — `mergePdfs`/`getPdfPageCount`
 * are NOT mocked (`vi.importActual`), so the actual pdf-lib merge in
 * EnvelopeFinalizeService.finalize() really runs against the mocked
 * renderPdf's real (tiny, valid) PDF output.
 */
interface MockSendMailInput {
  to: string;
  subject: string;
  html: string;
  attachments?: Array<{ filename: string; content: Buffer; contentType?: string }>;
}

const s3Store = new Map<string, Buffer>();
const sendMailMock = vi.fn(async (_input: MockSendMailInput) => undefined);

vi.mock("@eden/integrations", async () => {
  const actual = await vi.importActual<typeof import("@eden/integrations")>("@eden/integrations");
  return {
    ...actual,
    renderPdf: vi.fn(async () => {
      const doc = await PDFDocument.create();
      doc.addPage();
      return Buffer.from(await doc.save());
    }),
    uploadObject: vi.fn(async (key: string, buffer: Buffer) => {
      s3Store.set(key, buffer);
    }),
    getObjectStream: vi.fn(async (key: string) => {
      const buffer = s3Store.get(key);
      if (!buffer) throw new Error(`qa mock S3: no object at ${key}`);
      return Readable.from([buffer]);
    }),
    sendMail: (input: MockSendMailInput) => sendMailMock(input),
  };
});

function extractUrlFromLastEmailTo(to: string, pattern: RegExp): string {
  const call = sendMailMock.mock.calls.find((c) => c[0].to === to);
  const html = call?.[0].html ?? "";
  const match = html.match(pattern);
  if (!match?.[1]) throw new Error(`URL not found in email to ${to}`);
  return match[1];
}

function extractOtpCodeFromLastEmail(to: string): string {
  const calls = sendMailMock.mock.calls.filter((c) => c[0].to === to);
  const html = calls.at(-1)?.[0].html ?? "";
  const match = html.match(/(\d{6})/);
  if (!match?.[1]) throw new Error(`OTP code not found in email to ${to}`);
  return match[1];
}

describe("signature envelopes — full lifecycle", () => {
  let app: INestApplication;
  let admin: AuthedTokens;
  let companyId: string;
  let resellerId: string;
  let generationId: string;
  let envelopeId: string;
  let documentId: string;
  let contratadaEmail: string;
  let contratanteEmail: string;
  let contratadaToken: string;
  let contratanteToken: string;

  beforeAll(async () => {
    app = await createTestApp();
    admin = await loginSuperAdmin(app);

    contratadaEmail = qaEmail("sig-contratada");
    contratanteEmail = qaEmail("sig-contratante");

    const company = await agent(app)
      .post("/api/v1/companies")
      .set(...bearer(admin.accessToken))
      .send({
        companyName: "qa-test- Empresa Assinatura",
        legalRepName: "Representante Legal QA",
        legalRepCpf: "11144477735",
        legalRepEmail: contratadaEmail,
        legalRepRole: "Diretor",
      })
      .expect(201);
    companyId = company.body.id;

    const reseller = await agent(app)
      .post("/api/v1/resellers")
      .set(...bearer(admin.accessToken))
      .send({ name: "qa-test- Revenda Assinatura" })
      .expect(201);
    resellerId = reseller.body.id;

    const template = await agent(app)
      .post("/api/v1/documents/templates")
      .set(...bearer(admin.accessToken))
      .send({ key: `qa_test_sig_${Date.now()}`, name: "qa-test- Template Assinatura", docGroup: "revenda" })
      .expect(201);
    const templateId = template.body.id;

    await agent(app)
      .post(`/api/v1/documents/templates/${templateId}/draft`)
      .set(...bearer(admin.accessToken))
      .expect(201);
    await agent(app)
      .patch(`/api/v1/documents/templates/${templateId}/draft`)
      .set(...bearer(admin.accessToken))
      .send({
        editorContent: {
          type: "doc",
          content: [
            { type: "paragraph", content: [{ type: "text", text: "Contrato de teste para assinatura eletrônica." }] },
          ],
        },
      })
      .expect(200);
    await agent(app)
      .post(`/api/v1/documents/templates/${templateId}/publish`)
      .set(...bearer(admin.accessToken))
      .expect(201);

    const generation = await agent(app)
      .post("/api/v1/documents/generations")
      .set(...bearer(admin.accessToken))
      .send({ templateId, resellerId, context: {} })
      .expect(201);
    generationId = generation.body.id;
  });

  afterAll(async () => {
    await agent(app)
      .patch(`/api/v1/resellers/${resellerId}`)
      .set(...bearer(admin.accessToken))
      .send({ active: false })
      .expect(200);
    await closeTestApp(app);
  });

  it("creates the envelope with an auto contratada signer + the requested contratante", async () => {
    const res = await agent(app)
      .post("/api/v1/signature-envelopes")
      .set(...bearer(admin.accessToken))
      .send({
        companyId,
        resellerId,
        documentGenerationIds: [generationId],
        signers: [{ fullName: "Cliente QA", cpf: "52998224725", email: contratanteEmail }],
      })
      .expect(201);

    expect(res.body.status).toBe("READY");
    expect(res.body.signers).toHaveLength(2);
    const contratada = res.body.signers.find((s: { party: string }) => s.party === "contratada");
    const contratante = res.body.signers.find((s: { party: string }) => s.party === "contratante");
    expect(contratada.full_name).toBe("Representante Legal QA");
    expect(contratada.email).toBe(contratadaEmail);
    expect(contratante.email).toBe(contratanteEmail);
    expect(res.body.documents).toHaveLength(1);

    envelopeId = res.body.id;
    documentId = res.body.documents[0].id;
  });

  it("downloads the frozen document PDF via the authenticated backoffice route", async () => {
    const res = await agent(app)
      .get(`/api/v1/signature-envelopes/${envelopeId}/documents/${documentId}/pdf`)
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(res.headers["content-type"]).toBe("application/pdf");
    expect(res.body.length).toBeGreaterThan(0);
  });

  it("rejects creation for a company with no legal representative", async () => {
    const bareCompany = await agent(app)
      .post("/api/v1/companies")
      .set(...bearer(admin.accessToken))
      .send({ companyName: "qa-test- Empresa Sem Rep Legal" })
      .expect(201);

    const res = await agent(app)
      .post("/api/v1/signature-envelopes")
      .set(...bearer(admin.accessToken))
      .send({
        companyId: bareCompany.body.id,
        resellerId,
        documentGenerationIds: [generationId],
        signers: [{ fullName: "Cliente QA 2", cpf: "52998224725", email: qaEmail("sig-nope") }],
      })
      .expect(400);
    expect(res.body.message).toContain("representante legal");
  });

  it("sends the invite to both parties and transitions to SENT", async () => {
    sendMailMock.mockClear();
    const res = await agent(app)
      .post(`/api/v1/signature-envelopes/${envelopeId}/send`)
      .set(...bearer(admin.accessToken))
      .send({ targets: "both" })
      .expect(201);
    expect(res.body.status).toBe("SENT");
    expect(sendMailMock).toHaveBeenCalledTimes(2);

    contratadaToken = extractUrlFromLastEmailTo(contratadaEmail, /\/assinar\/([a-f0-9]{64})/)!;
    contratanteToken = extractUrlFromLastEmailTo(contratanteEmail, /\/assinar\/([a-f0-9]{64})/)!;
    expect(contratadaToken).not.toBe(contratanteToken);
  });

  async function runSignerFlow(token: string, email: string) {
    const state = await agent(app).get(`/api/v1/public-signature/${token}`).expect(200);
    expect(state.body.signer.status).toBe("VIEWED");
    expect(state.body.documents).toHaveLength(1);

    const pdf = await agent(app).get(`/api/v1/public-signature/${token}/documents/${documentId}/pdf`).expect(200);
    expect(pdf.headers["content-type"]).toBe("application/pdf");
    await agent(app).post(`/api/v1/public-signature/${token}/documents/${documentId}/confirm-read`).expect(201);
    await agent(app).post(`/api/v1/public-signature/${token}/confirm-data`).expect(201);
    await agent(app).post(`/api/v1/public-signature/${token}/consent`).expect(201);

    sendMailMock.mockClear();
    await agent(app).post(`/api/v1/public-signature/${token}/otp/request`).expect(201);
    const code = extractOtpCodeFromLastEmail(email);

    await agent(app).post(`/api/v1/public-signature/${token}/otp/verify`).send({ code: "000000" }).expect(400);
    await agent(app).post(`/api/v1/public-signature/${token}/otp/verify`).send({ code }).expect(201);
    await agent(app).post(`/api/v1/public-signature/${token}/otp/verify`).send({ code }).expect(409); // single-use

    await agent(app).post(`/api/v1/public-signature/${token}/sign`).expect(201);
  }

  it("walks the contratada through the full public flow and signs", async () => {
    await runSignerFlow(contratadaToken, contratadaEmail);
  });

  it("envelope is still SENT with one signer left", async () => {
    const res = await agent(app)
      .get(`/api/v1/signature-envelopes/${envelopeId}`)
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(res.body.status).toBe("SENT");
  });

  it("walks the contratante through the full public flow — completing all signers flips the envelope straight to SIGNED", async () => {
    await runSignerFlow(contratanteToken, contratanteEmail);

    const res = await agent(app)
      .get(`/api/v1/signature-envelopes/${envelopeId}`)
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(res.body.status).toBe("SIGNED");
    expect(res.body.signers.every((s: { status: string }) => s.status === "SIGNED")).toBe(true);
  });

  it("the audit chain verifies clean before finalization", async () => {
    const res = await agent(app)
      .get(`/api/v1/signature-envelopes/${envelopeId}/verify-audit`)
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(res.body.valid).toBe(true);
    expect(res.body.eventsChecked).toBeGreaterThan(10);
  });

  let verificationId: string;

  it("seals the evidence checkpoint — SIGNED -> FINALIZING", async () => {
    const res = await agent(app)
      .post(`/api/v1/signature-envelopes/${envelopeId}/seal-checkpoint`)
      .set(...bearer(admin.accessToken))
      .expect(201);
    expect(res.body.status).toBe("FINALIZING");
    expect(res.body.verification_id).toMatch(/^[a-f0-9]{32}$/);
    expect(res.body.envelope_hash).toMatch(/^[a-f0-9]{64}$/);
    verificationId = res.body.verification_id;
  });

  it("finalize renders the certificate, consolidates the final PDF, and completes the envelope", async () => {
    sendMailMock.mockClear();
    const res = await agent(app)
      .post(`/api/v1/signature-envelopes/${envelopeId}/finalize`)
      .set(...bearer(admin.accessToken))
      .expect(201);
    expect(res.body.status).toBe("COMPLETED");
    expect(res.body.final_pdf_sha256).toMatch(/^[a-f0-9]{64}$/);

    const finalBuffer = s3Store.get(res.body.final_s3_key);
    expect(finalBuffer).toBeDefined();
    const merged = await PDFDocument.load(finalBuffer!);
    expect(merged.getPageCount()).toBe(2); // 1 frozen document page + 1 certificate page

    expect(sendMailMock).toHaveBeenCalledTimes(1); // only the contratante gets the final PDF
    expect(sendMailMock.mock.calls[0]![0].to).toBe(contratanteEmail);
  });

  it("downloads the final consolidated PDF via the authenticated backoffice route", async () => {
    const res = await agent(app)
      .get(`/api/v1/signature-envelopes/${envelopeId}/final-pdf`)
      .set(...bearer(admin.accessToken))
      .expect(200);
    expect(res.headers["content-type"]).toBe("application/pdf");
    expect(res.body.length).toBeGreaterThan(0);
  });

  it("public verify endpoint confirms integrity for the completed envelope", async () => {
    const res = await agent(app).get(`/api/v1/public-verify/${verificationId}`).expect(200);
    expect(res.body.integrityValid).toBe(true);
    expect(res.body.signers.every((s: { name: string }) => /\*/.test(s.name))).toBe(true); // masked
  });

  it("public verify 404s for a non-completed or unknown verification id", async () => {
    await agent(app).get("/api/v1/public-verify/0000000000000000000000000000ff").expect(404);
  });

  it("a revoked/unknown token is rejected on the public flow", async () => {
    await agent(app).get("/api/v1/public-signature/0000000000000000000000000000000000000000000000000000000000000000").expect(404);
  });

  it("the envelope can no longer be deleted once SIGNED/COMPLETED", async () => {
    const res = await agent(app)
      .delete(`/api/v1/signature-envelopes/${envelopeId}`)
      .set(...bearer(admin.accessToken))
      .expect(409);
    expect(res.body.message).toMatch(/cancelar/i);
  });
});