import { jest } from "@jest/globals";

// Manual DB mock: getPool() returns a fake pooled client whose query() the test
// drives. No real database, no injection seams — the module under test calls the
// real getPool(), which Jest replaces here.
const query = jest.fn();
const release = jest.fn(async () => {});
jest.unstable_mockModule("../../db/index.js", () => ({
  getPool: async () => ({ query, release }),
}));

const { verifyKey, generateKey, listKeys, revokeKey, migrateLegacyApiKeys, _resetKeyCache } = await import("./apiKey.js");

beforeEach(() => {
  query.mockReset();
  release.mockClear();
  _resetKeyCache();
});

// Mint a key through generateKey and capture the stored (salted) hash, so the
// verifyKey tests can round-trip a real scrypt hash without a DB.
async function mintKey({ userId = 1, appId = 2 } = {}) {
  query
    .mockResolvedValueOnce({ rows: [{ id: appId }] }) // SELECT app
    .mockResolvedValueOnce({ rows: [{ id: 9, created_ts: "2026-01-01" }] }); // INSERT
  const out = await generateKey(userId, "core", { label: "ci" });
  const insertParams = query.mock.calls[1][1];
  return { raw: out.key, keyHash: insertParams[3], out };
}

describe("generateKey", () => {
  it("stores a salted scrypt hash (not the raw key) and returns the raw key once", async () => {
    const { raw, keyHash, out } = await mintKey();
    expect(raw).toMatch(/^[0-9a-f]{64}$/);
    expect(out).toMatchObject({ id: 9, prefix: raw.slice(0, 8), appType: "core", label: "ci" });
    // Stored hash is "<saltHex>:<derivedHex>" and never contains the raw key.
    expect(keyHash).toMatch(/^[0-9a-f]{32}:[0-9a-f]{128}$/);
    expect(keyHash).not.toContain(raw);
    expect(query.mock.calls[1][1]).not.toContain(raw);
  });

  it("throws for an unknown app type", async () => {
    query.mockResolvedValueOnce({ rows: [] }); // app lookup empty
    await expect(generateKey(1, "nope", {})).rejects.toThrow("unknown app type");
  });
});

describe("verifyKey", () => {
  it("returns null for an empty key without touching the DB", async () => {
    expect(await verifyKey("")).toBeNull();
    expect(query).not.toHaveBeenCalled();
  });

  it("verifies a real key by prefix + scrypt, then serves the cache without a DB query", async () => {
    const { raw, keyHash } = await mintKey();
    query.mockReset();
    // First verify: prefix lookup returns the candidate, UPDATE last_used is best-effort.
    query
      .mockResolvedValueOnce({ rows: [{ id: 9, user_id: 1, app_id: 2, key_hash: keyHash }] })
      .mockResolvedValue({ rows: [] });

    const first = await verifyKey(raw);
    expect(first).toEqual({ user_id: 1, app_id: 2 });
    expect(query.mock.calls[0][1]).toEqual([raw.slice(0, 8)]); // looked up by prefix

    // Second verify: served from the 30-min cache — no new SELECT.
    query.mockClear();
    const second = await verifyKey(raw);
    expect(second).toEqual({ user_id: 1, app_id: 2 });
    const selects = query.mock.calls.filter((c) => /SELECT/.test(c[0]));
    expect(selects).toHaveLength(0);
  });

  it("returns null when a candidate's hash does not match the raw key", async () => {
    const { keyHash } = await mintKey();
    query.mockReset();
    query.mockResolvedValueOnce({ rows: [{ id: 9, user_id: 1, app_id: 2, key_hash: keyHash }] });
    expect(await verifyKey("some-other-raw-key-that-does-not-match")).toBeNull();
  });

  it("returns null when no candidate row matches the prefix", async () => {
    query.mockResolvedValueOnce({ rows: [] });
    expect(await verifyKey("deadbeefcafefeed")).toBeNull();
  });
});

describe("listKeys", () => {
  it("returns metadata rows for the user", async () => {
    const rows = [{ id: 1, appType: "core", prefix: "ab12cd34" }];
    query.mockResolvedValueOnce({ rows });
    expect(await listKeys(7)).toEqual(rows);
    expect(query.mock.calls[0][1]).toEqual([7]);
  });
});

describe("revokeKey", () => {
  it("deletes the user's key and evicts its cached validation", async () => {
    // Prime the cache by verifying a real key (id 9).
    const { raw, keyHash } = await mintKey();
    query.mockReset();
    query
      .mockResolvedValueOnce({ rows: [{ id: 9, user_id: 1, app_id: 2, key_hash: keyHash }] })
      .mockResolvedValue({ rows: [] });
    await verifyKey(raw);

    // Revoke id 9 -> deletes, and the cached entry is evicted so the next verify re-hits the DB.
    query.mockReset();
    query.mockResolvedValueOnce({ rowCount: 1, rows: [{ id: 9 }] });
    expect(await revokeKey(7, 9)).toBe(true);
    expect(query.mock.calls[0][1]).toEqual([9, 7]); // scoped to (id, user_id)

    query.mockReset();
    query.mockResolvedValueOnce({ rows: [] }); // no candidate now
    expect(await verifyKey(raw)).toBeNull(); // cache was evicted -> DB consulted again
    expect(query.mock.calls[0][0]).toMatch(/SELECT/);
  });

  it("returns false when nothing was deleted", async () => {
    query.mockResolvedValueOnce({ rowCount: 0, rows: [] });
    expect(await revokeKey(7, 3)).toBe(false);
  });
});

describe("migrateLegacyApiKeys", () => {
  it("imports each legacy key once, hashed and with its prefix", async () => {
    query
      .mockResolvedValueOnce({ rows: [{ user_id: 1, app_id: 2, api_key: "abcdef1234567890" }] }) // SELECT auth
      .mockResolvedValueOnce({ rowCount: 0, rows: [] }) // existence check -> not present
      .mockResolvedValueOnce({ rows: [] }); // INSERT
    expect(await migrateLegacyApiKeys()).toBe(1);
    const [sql, params] = query.mock.calls[2];
    expect(sql).toMatch(/INSERT INTO api_key/);
    expect(params[4]).toBe("abcdef12"); // key_prefix = first 8 chars of the raw key
    expect(params[3]).toContain(":"); // salted scrypt hash "<saltHex>:<derivedHex>"
  });

  it("skips a key that was already imported (idempotent)", async () => {
    query
      .mockResolvedValueOnce({ rows: [{ user_id: 1, app_id: 2, api_key: "abcdef1234567890" }] }) // SELECT auth
      .mockResolvedValueOnce({ rowCount: 1, rows: [{ ok: 1 }] }); // existence check -> present
    expect(await migrateLegacyApiKeys()).toBe(0);
    expect(query).toHaveBeenCalledTimes(2); // SELECT + existence check, no INSERT
  });
});