/**
 * Unit tests for the Complete Credential (DBIS cc-*) adapters.
 *
 * All tests are headless — they either exercise the embedded mock /
 * matrix or stub `fetch` directly. No network, no UI.
 */

import {
  createCcIdentityClient,
  loadControlsMatrix,
  findControl,
  type CcIdentityClient,
} from "../../src/services/completeCredential";

describe("completeCredential.createCcIdentityClient() — mock mode", () => {
  let client: CcIdentityClient;

  beforeAll(() => {
    delete process.env.CC_IDENTITY_URL;
    delete process.env.CC_IDENTITY_API_KEY;
    client = createCcIdentityClient();
  });

  it("reports mock mode", () => {
    expect(client.mode).toBe("mock");
  });

  it("returns ok for health()", async () => {
    const h = await client.health();
    expect(h.status).toBe("ok");
    expect(h.service).toBe("cc-identity-core");
  });

  it("returns a ready response with persistence=false in mock", async () => {
    const r = await client.ready();
    expect(r.status).toBe("ok");
    expect(r.persistence).toBe(false);
  });

  it("creates a subject with a uuid and defaulted tenant/entity", async () => {
    const s = await client.createSubject({});
    expect(s.subjectId).toMatch(/^[0-9a-f-]{36}$/);
    expect(s.tenantId).toBe("tenant-demo");
    expect(s.entityId).toBe("entity-demo");
  });

  it("passes tenant/entity through when provided", async () => {
    const s = await client.createSubject({
      tenantId: "t-acme",
      entityId: "e-bank-1",
    });
    expect(s.tenantId).toBe("t-acme");
    expect(s.entityId).toBe("e-bank-1");
  });
});

describe("completeCredential.createCcIdentityClient() — live mode (stubbed fetch)", () => {
  function makeFetch(
    record: (url: string, init: RequestInit) => void,
    responseBody: unknown,
    status = 200,
  ): typeof fetch {
    return (async (input: string | URL | Request, init?: RequestInit) => {
      record(String(input), init ?? {});
      return new Response(JSON.stringify(responseBody), {
        status,
        headers: { "Content-Type": "application/json" },
      });
    }) as typeof fetch;
  }

  it("reports live mode when baseUrl is set", () => {
    const client = createCcIdentityClient({
      baseUrl: "http://cc.example.test",
      fetchImpl: makeFetch(() => undefined, { status: "ok", service: "x" }),
    });
    expect(client.mode).toBe("live");
  });

  it("hits GET /health", async () => {
    const calls: string[] = [];
    const client = createCcIdentityClient({
      baseUrl: "http://cc.example.test",
      fetchImpl: makeFetch(
        (url) => {
          calls.push(url);
        },
        { status: "ok", service: "cc-identity-core" },
      ),
    });
    const h = await client.health();
    expect(h.status).toBe("ok");
    expect(calls[0]).toBe("http://cc.example.test/health");
  });

  it("posts to /v1/subjects with X-Correlation-Id + api key header", async () => {
    const calls: { url: string; headers: Record<string, string>; body?: string }[] = [];
    const client = createCcIdentityClient({
      baseUrl: "http://cc.example.test",
      apiKey: "k-1",
      fetchImpl: makeFetch(
        (url, init) => {
          calls.push({
            url,
            headers: (init.headers ?? {}) as Record<string, string>,
            body: init.body as string,
          });
        },
        {
          subjectId: "11111111-2222-3333-4444-555555555555",
          tenantId: "t-1",
          entityId: "e-1",
          createdAt: "2026-01-01T00:00:00Z",
        },
      ),
    });

    const s = await client.createSubject({ tenantId: "t-1", entityId: "e-1" }, "corr-42");
    expect(s.subjectId).toContain("-");
    expect(calls[0].url).toBe("http://cc.example.test/v1/subjects");
    expect(calls[0].headers["X-API-Key"]).toBe("k-1");
    expect(calls[0].headers["X-Correlation-Id"]).toBe("corr-42");
    expect(JSON.parse(calls[0].body ?? "{}")).toEqual({
      tenantId: "t-1",
      entityId: "e-1",
    });
  });

  it("auto-generates a correlation id when not provided", async () => {
    const calls: Record<string, string>[] = [];
    const client = createCcIdentityClient({
      baseUrl: "http://cc.example.test",
      fetchImpl: makeFetch(
        (_url, init) => {
          calls.push((init.headers ?? {}) as Record<string, string>);
        },
        {
          subjectId: "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
          tenantId: "t",
          entityId: "e",
          createdAt: "2026-01-01T00:00:00Z",
        },
      ),
    });
    await client.createSubject({});
    expect(calls[0]["X-Correlation-Id"]).toMatch(/^[0-9a-f-]{36}$/);
  });

  it("throws a descriptive error on non-2xx", async () => {
    const client = createCcIdentityClient({
      baseUrl: "http://cc.example.test",
      fetchImpl: makeFetch(() => undefined, { error: "boom" }, 500),
    });
    await expect(client.health()).rejects.toThrow(/HTTP 500/);
  });
});

describe("completeCredential.loadControlsMatrix() — embedded mode", () => {
  beforeAll(() => {
    delete process.env.CC_CONTROLS_MATRIX_URL;
  });

  it("returns the embedded v0 matrix when no URL is set", async () => {
    const m = await loadControlsMatrix();
    expect(m.source).toBe("embedded");
    expect(m.version).toBe(0);
    expect(m.domains.length).toBeGreaterThan(0);
  });

  it("exposes expected control ids", async () => {
    const m = await loadControlsMatrix();
    const ids = m.domains.flatMap((d) => d.controls.map((c) => c.id));
    expect(ids).toEqual(expect.arrayContaining(["IDP-001", "PAY-001", "AUD-001", "REG-001"]));
  });

  it("findControl() resolves by id", async () => {
    const m = await loadControlsMatrix();
    const c = findControl(m, "PAY-001");
    expect(c?.title).toContain("PAN");
  });

  it("findControl() returns undefined for unknown ids", async () => {
    const m = await loadControlsMatrix();
    expect(findControl(m, "NOPE-999")).toBeUndefined();
  });
});

describe("completeCredential.loadControlsMatrix() — remote mode", () => {
  function makeFetch(responseBody: unknown, status = 200): typeof fetch {
    return (async () =>
      new Response(JSON.stringify(responseBody), {
        status,
        headers: { "Content-Type": "application/json" },
      })) as typeof fetch;
  }

  it("fetches and normalises a JSON matrix", async () => {
    const matrix = await loadControlsMatrix({
      url: "http://cc.example.test/controls/matrix/v0.json",
      fetchImpl: makeFetch({
        version: 1,
        domains: [
          {
            id: "extra",
            controls: [
              {
                id: "X-001",
                title: "Extra",
                evidence_type: "doc_review",
                owner_team: "ops",
                frequency: "monthly",
              },
            ],
          },
        ],
      }),
    });
    expect(matrix.source).toBe("remote");
    expect(matrix.version).toBe(1);
    expect(matrix.domains[0].controls[0].evidenceType).toBe("doc_review");
    expect(matrix.domains[0].controls[0].ownerTeam).toBe("ops");
  });

  it("throws on non-2xx", async () => {
    await expect(
      loadControlsMatrix({
        url: "http://cc.example.test/nope",
        fetchImpl: makeFetch({}, 404),
      }),
    ).rejects.toThrow(/HTTP 404/);
  });
});