const http = require("node:http");
const fs = require("node:fs");
const os = require("node:os");
const path = require("node:path");

// Claude usage snapshot (issue #48): POST /claude-usage pushed by the ThinkPad
// agent, GET /claude-usage read by the admin dashboard.
//
// Three things are pinned here.
//   * The sanitizer, as a pure function (claude-usage.js): the whitelist, the
//     contract bounds, and the rule that an invalid value is dropped rather
//     than coerced.
//   * The gate: a third token kind, `claude-ingest`, isolated both ways from
//     the workstation token and from the read token, each ingestion token
//     failing closed to a 503 that names its own variable.
//   * The round trip: ceiling, atomic write, server-stamped receivedAt, and a
//     staleness decided by the server alone.

const TOKEN = "test-token";
const INGEST_TOKEN = "test-ingest-token";
const CLAUDE_TOKEN = "test-claude-token";

// Restated rather than imported, so a silent change to the constant turns the
// matrix red instead of quietly re-drawing the ceiling (same rule as hosts).
const CLAUDE_MAX_BODY_BYTES = 65536;
const HOSTS_MAX_BODY_BYTES = 4096;
const DEFAULT_STALE_SECONDS = 2700;
const FROZEN_NOW = Date.UTC(2026, 8, 27, 19, 0, 0);

let tmpDir;
let usagePath;
let server;
let baseUrl;

function validUsage() {
  return {
    schemaVersion: 1,
    generatedAt: "2026-09-27T19:00:00.000Z",
    claudeCodeVersion: "2.1.283",
    timeZone: "America/Toronto",
    limits: {
      status: "ok",
      detail: "http_429",
      fetchedAt: "2026-09-27T19:00:00.000Z",
      items: [
        { kind: "session", group: "session", percent: 1, severity: "normal", resetsAt: "2026-09-27T21:30:00Z", model: null },
        { kind: "weekly_scoped", group: "weekly", percent: 63, severity: "normal", resetsAt: "2026-10-01T07:00:00Z", model: "Fable" },
      ],
    },
    days: [
      { date: "2026-09-26", models: {} },
      {
        date: "2026-09-27",
        models: { "claude-opus-5-5": { input: 2, output: 1950, cacheCreation: 43176, cacheRead: 33814, requests: 1 } },
      },
    ],
    projects: [
      { name: "simpl-resultat", work: 123456, cacheRead: 7890123, requests: 812 },
      { name: "(autres)", work: 10, cacheRead: 20, requests: 3 },
    ],
  };
}

function freshSanitizer() {
  delete require.cache[require.resolve("../claude-usage.js")];
  return require("../claude-usage.js");
}

function startServer() {
  delete require.cache[require.resolve("../index.js")];
  delete require.cache[require.resolve("../claude-usage.js")];
  const { handler } = require("../index.js");
  server = http.createServer(handler);
  return new Promise((resolve) => {
    server.listen(0, () => {
      baseUrl = `http://127.0.0.1:${server.address().port}`;
      resolve();
    });
  });
}

function stopServer() {
  return new Promise((resolve) => {
    if (!server) return resolve();
    server.close(() => resolve());
  });
}

async function restartServer() {
  await stopServer();
  await startServer();
}

async function request(route, { method = "GET", auth, body, headers: extra } = {}) {
  const headers = { ...extra };
  if (auth) headers.Authorization = auth;
  if (body !== undefined) headers["Content-Type"] = "application/json";
  const res = await fetch(`${baseUrl}${route}`, { method, headers, body });
  const parsed = await res.json().catch(() => ({}));
  return { status: res.status, body: parsed };
}

function push({ auth = `Bearer ${CLAUDE_TOKEN}`, body = JSON.stringify(validUsage()) } = {}) {
  return request("/claude-usage", { method: "POST", auth, body });
}

function read(auth = `Bearer ${TOKEN}`) {
  return request("/claude-usage", { auth });
}

// Same contract as hosts.test.js: the 413 must come back as a status, a dead
// socket is reported as such and never folded into the expected value.
async function pushOversized(route, body, auth) {
  try {
    const { status } = await request(route, { method: "POST", auth, body });
    return status;
  } catch (err) {
    return `transport error instead of a status: ${err.cause?.code || err.code || err.message}`;
  }
}

// A JSON body of exactly `bytes` bytes around a payload that is otherwise valid.
function bodyOfExactly(base, bytes) {
  const padded = { ...base, padding: "" };
  const overhead = JSON.stringify(padded).length;
  return JSON.stringify({ ...padded, padding: "x".repeat(bytes - overhead) });
}

function writeStored(record) {
  fs.mkdirSync(path.dirname(usagePath), { recursive: true });
  fs.writeFileSync(usagePath, typeof record === "string" ? record : JSON.stringify(record));
}

async function frozenRead() {
  const realNow = Date.now;
  Date.now = () => FROZEN_NOW;
  try {
    return await read();
  } finally {
    Date.now = realNow;
  }
}

beforeEach(async () => {
  tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "vps-health-claude-usage-test-"));
  usagePath = path.join(tmpDir, "claude-usage", "claude-usage.json");

  process.env.HEALTH_TOKEN = TOKEN;
  process.env.HOSTS_INGEST_TOKEN = INGEST_TOKEN;
  process.env.CLAUDE_USAGE_INGEST_TOKEN = CLAUDE_TOKEN;
  process.env.CLAUDE_USAGE_PATH = usagePath;
  delete process.env.CLAUDE_USAGE_STALE_SECONDS;
  process.env.HOSTS_DIR = path.join(tmpDir, "hosts");
  process.env.HOSTS_ALLOWED_IDS = "thinkpad";
  process.env.REPORTS_DIR = path.join(tmpDir, "reports");
  process.env.DEFENSEURS_AGENTS_MAP_PATH = path.join(tmpDir, "agents-map.json");
  process.env.DEFENSEURS_STATUS_PATH = path.join(tmpDir, "status.json");
  process.env.DEFENSEURS_FINDINGS_STATE_PATH = path.join(tmpDir, "findings-state.json");
  // Closed port: no request may reach the real IdP.
  process.env.LOGTO_HEALTH_URL = "http://127.0.0.1:1/oidc/.well-known/openid-configuration";

  await startServer();
});

afterEach(async () => {
  await stopServer();
  fs.rmSync(tmpDir, { recursive: true, force: true });
});

afterAll(() => {
  // Other files reuse the worker: leave no claude-usage config behind.
  delete process.env.CLAUDE_USAGE_INGEST_TOKEN;
  delete process.env.CLAUDE_USAGE_PATH;
  delete process.env.CLAUDE_USAGE_STALE_SECONDS;
});

// --- The sanitizer, as a pure function --------------------------------------

describe("sanitizeClaudeUsage — the contract, kept as is", () => {
  test("a valid snapshot comes back identical", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    expect(sanitizeClaudeUsage(validUsage())).toEqual({ snapshot: validUsage() });
  });

  test("it is idempotent, so GET can re-run it on the stored file", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const noisy = { ...validUsage(), extra: 1, timeZone: "T".repeat(500) };
    const once = sanitizeClaudeUsage(noisy).snapshot;
    expect(sanitizeClaudeUsage(once).snapshot).toEqual(once);
  });

  test("the nullable fields keep an explicit null", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.fetchedAt = null;
    payload.limits.items[0].resetsAt = null;
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot.limits.fetchedAt).toBeNull();
    expect(snapshot.limits.items[0].resetsAt).toBeNull();
    expect(snapshot.limits.items[0].model).toBeNull();
  });

  test("every status of the enum is kept", () => {
    const { sanitizeClaudeUsage, LIMIT_STATUSES } = freshSanitizer();
    expect(LIMIT_STATUSES).toEqual(["ok", "token_expired", "http_error", "unavailable", "disabled"]);
    for (const status of LIMIT_STATUSES) {
      const payload = validUsage();
      payload.limits.status = status;
      expect(sanitizeClaudeUsage(payload).snapshot.limits.status).toBe(status);
    }
  });

  test("the documented detail codes are kept", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    for (const detail of ["no_credentials", "parse_error", "no_version", "timeout", "network", "bad_response", "http_503"]) {
      const payload = validUsage();
      payload.limits.detail = detail;
      expect(sanitizeClaudeUsage(payload).snapshot.limits.detail).toBe(detail);
    }
  });

  test("0 is a legitimate count and 0 and 100 legitimate percents", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.items[0].percent = 0;
    payload.limits.items[1].percent = 100;
    payload.projects[0].work = 0;
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot.limits.items.map((item) => item.percent)).toEqual([0, 100]);
    expect(snapshot.projects[0].work).toBe(0);
  });
});

describe("sanitizeClaudeUsage — the whole body refused", () => {
  test.each([
    ["an array", []],
    ["null", null],
    ["a string", "snapshot"],
    ["a number", 1],
  ])("error on %s", (_label, payload) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    expect(sanitizeClaudeUsage(payload)).toEqual({ error: "body must be a JSON object" });
  });

  test.each([
    ["missing", undefined],
    ["2", 2],
    ["the string \"1\"", "1"],
  ])("error when schemaVersion is %s", (_label, schemaVersion) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    expect(sanitizeClaudeUsage({ ...validUsage(), schemaVersion })).toEqual({ error: "schemaVersion must be 1" });
  });
});

describe("sanitizeClaudeUsage — invalid values are dropped, not coerced", () => {
  test("unknown fields are dropped at every level", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.extra = "x";
    payload.limits.extra = "x";
    payload.limits.items[0].extra = "x";
    payload.days[1].extra = "x";
    payload.days[1].models["claude-opus-5-5"].extra = 1;
    payload.projects[0].extra = "x";
    expect(sanitizeClaudeUsage(payload).snapshot).toEqual(validUsage());
  });

  test("a __proto__ key, top-level or as a model name, never survives", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const raw = JSON.stringify(validUsage())
      .replace('"schemaVersion":1', '"__proto__":{"polluted":true},"schemaVersion":1')
      .replace('"models":{}', '"models":{"__proto__":{"input":1}}');
    const { snapshot } = sanitizeClaudeUsage(JSON.parse(raw));
    expect(Object.keys(snapshot)).not.toContain("__proto__");
    expect(Object.keys(snapshot.days[0].models)).toEqual([]);
    expect({}.polluted).toBeUndefined();
  });

  const BAD_NUMBERS = [
    ["negative", -1],
    ["past 2^53", 2 ** 53 + 2],
    ["exactly 2^53 (not a safe integer)", 2 ** 53],
    ["fractional", 1.5],
    ["a string", "12"],
    ["null", null],
  ];

  test.each(BAD_NUMBERS)("a %s model counter is dropped", (_label, value) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.days[1].models["claude-opus-5-5"].output = value;
    const model = sanitizeClaudeUsage(payload).snapshot.days[1].models["claude-opus-5-5"];
    expect(model).not.toHaveProperty("output");
    expect(model.input).toBe(2);
  });

  test.each(BAD_NUMBERS)("a %s project counter is dropped", (_label, value) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.projects[0].work = value;
    const project = sanitizeClaudeUsage(payload).snapshot.projects[0];
    expect(project).not.toHaveProperty("work");
    expect(project.requests).toBe(812);
  });

  test("a number past 2^53 written in the raw JSON is dropped", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const raw = JSON.stringify(validUsage()).replace('"requests":812', '"requests":9007199254740993');
    expect(sanitizeClaudeUsage(JSON.parse(raw)).snapshot.projects[0]).not.toHaveProperty("requests");
  });

  test.each([
    ["over 100", 101],
    ["negative", -1],
    ["fractional", 63.5],
  ])("a percent %s is dropped", (_label, value) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.items[1].percent = value;
    const item = sanitizeClaudeUsage(payload).snapshot.limits.items[1];
    expect(item).not.toHaveProperty("percent");
    expect(item.kind).toBe("weekly_scoped");
  });

  test.each([
    ["an unknown value", "rate_limited"],
    ["a different case", "OK"],
    ["a number", 1],
  ])("a status that is %s is dropped", (_label, status) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.status = status;
    const { limits } = sanitizeClaudeUsage(payload).snapshot;
    expect(limits).not.toHaveProperty("status");
    expect(limits.items).toHaveLength(2);
  });

  // `detail` is a reason code, never free text: an upstream response body
  // must not ride along to the dashboard.
  test.each([
    ["free text with spaces", "HTTP 500 Internal Server Error"],
    ["markup", "<html>"],
    ["uppercase", "HTTP_429"],
    ["empty", ""],
    ["33 characters", "a".repeat(33)],
    ["a number", 429],
  ])("a detail that is %s is dropped", (_label, detail) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.detail = detail;
    expect(sanitizeClaudeUsage(payload).snapshot.limits).not.toHaveProperty("detail");
  });

  test("a detail of exactly 32 characters is kept", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.limits.detail = "a".repeat(32);
    expect(sanitizeClaudeUsage(payload).snapshot.limits.detail).toBe("a".repeat(32));
  });

  test.each([
    ["a date without time", "2026-09-27"],
    ["no offset", "2026-09-27T19:00:00"],
    ["an impossible instant", "2026-13-45T99:00:00Z"],
    ["free text", "yesterday"],
    ["a number", 1759000000000],
  ])("a timestamp that is %s is dropped", (_label, value) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.generatedAt = value;
    payload.limits.fetchedAt = value;
    payload.limits.items[0].resetsAt = value;
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot).not.toHaveProperty("generatedAt");
    expect(snapshot.limits).not.toHaveProperty("fetchedAt");
    expect(snapshot.limits.items[0]).not.toHaveProperty("resetsAt");
  });

  test("an offset timestamp is a valid ISO date", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = { ...validUsage(), generatedAt: "2026-09-27T15:00:00.000-04:00" };
    expect(sanitizeClaudeUsage(payload).snapshot.generatedAt).toBe("2026-09-27T15:00:00.000-04:00");
  });

  test.each([
    ["no zero padding", "2026-9-27"],
    ["a day that does not exist", "2026-02-31"],
    ["a timestamp", "2026-09-27T00:00:00Z"],
    ["a number", 20260927],
  ])("a day whose date is %s is dropped", (_label, date) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.days[0].date = date;
    expect(sanitizeClaudeUsage(payload).snapshot.days.map((day) => day.date)).toEqual(["2026-09-27"]);
  });

  test.each([
    ["uppercase", "Claude-Opus"],
    ["a leading dot", ".hidden"],
    ["a slash", "claude/opus"],
    ["65 characters", `a${"b".repeat(64)}`],
  ])("a model key that is %s is dropped", (_label, key) => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.days[0].models[key] = { input: 1 };
    expect(sanitizeClaudeUsage(payload).snapshot.days[0].models).toEqual({});
  });

  test("a model key of 64 characters is kept", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    const key = `a${"b".repeat(63)}`;
    payload.days[0].models[key] = { input: 1 };
    expect(sanitizeClaudeUsage(payload).snapshot.days[0].models).toEqual({ [key]: { input: 1 } });
  });

  test("strings are truncated to 128 characters", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.claudeCodeVersion = "v".repeat(500);
    payload.timeZone = "t".repeat(500);
    payload.limits.items[0].kind = "k".repeat(500);
    payload.limits.items[1].model = "m".repeat(500);
    payload.projects[0].name = "n".repeat(500);
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot.claudeCodeVersion).toBe("v".repeat(128));
    expect(snapshot.timeZone).toBe("t".repeat(128));
    expect(snapshot.limits.items[0].kind).toBe("k".repeat(128));
    expect(snapshot.limits.items[1].model).toBe("m".repeat(128));
    expect(snapshot.projects[0].name).toBe("n".repeat(128));
  });

  test("a section of the wrong type is dropped, the rest kept", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = { ...validUsage(), limits: "ok", days: {}, projects: null };
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot).not.toHaveProperty("limits");
    expect(snapshot).not.toHaveProperty("days");
    expect(snapshot).not.toHaveProperty("projects");
    expect(snapshot.timeZone).toBe("America/Toronto");
  });

  test("entries that are not objects are dropped from every list", () => {
    const { sanitizeClaudeUsage } = freshSanitizer();
    const payload = validUsage();
    payload.days.unshift("2026-09-25", null);
    payload.limits.items.push([1]);
    payload.projects.push(42);
    payload.days[3].models["claude-opus-5-5"] = [1, 2];
    const { snapshot } = sanitizeClaudeUsage(payload);
    expect(snapshot.days).toHaveLength(2);
    expect(snapshot.days[1].models).toEqual({});
    expect(snapshot.limits.items).toHaveLength(2);
    expect(snapshot.projects).toHaveLength(2);
  });
});

describe("sanitizeClaudeUsage — list bounds", () => {
  function dayList(count) {
    const start = Date.UTC(2026, 7, 1);
    return Array.from({ length: count }, (_, i) => ({
      date: new Date(start + i * 86400000).toISOString().slice(0, 10),
      models: {},
    }));
  }

  test("31 days are kept; past that, the most recent 31", () => {
    const { sanitizeClaudeUsage, MAX_DAYS } = freshSanitizer();
    expect(MAX_DAYS).toBe(31);
    expect(sanitizeClaudeUsage({ ...validUsage(), days: dayList(31) }).snapshot.days).toEqual(dayList(31));
    const days = sanitizeClaudeUsage({ ...validUsage(), days: dayList(40) }).snapshot.days;
    expect(days).toEqual(dayList(40).slice(-31));
  });

  test("12 models per day; past that, the first 12", () => {
    const { sanitizeClaudeUsage, MAX_MODELS_PER_DAY } = freshSanitizer();
    expect(MAX_MODELS_PER_DAY).toBe(12);
    const payload = validUsage();
    payload.days[0].models = Object.fromEntries(
      Array.from({ length: 15 }, (_, i) => [`model-${String(i).padStart(2, "0")}`, { requests: i }]),
    );
    const models = sanitizeClaudeUsage(payload).snapshot.days[0].models;
    expect(Object.keys(models)).toHaveLength(12);
    expect(Object.keys(models).at(-1)).toBe("model-11");
  });

  test("12 limit items; past that, the first 12", () => {
    const { sanitizeClaudeUsage, MAX_LIMIT_ITEMS } = freshSanitizer();
    expect(MAX_LIMIT_ITEMS).toBe(12);
    const payload = validUsage();
    payload.limits.items = Array.from({ length: 14 }, (_, i) => ({ kind: `k${i}`, percent: i }));
    const items = sanitizeClaudeUsage(payload).snapshot.limits.items;
    expect(items).toHaveLength(12);
    expect(items.at(-1).kind).toBe("k11");
  });

  test("9 projects (top 8 plus \"(autres)\"); past that, the first 9", () => {
    const { sanitizeClaudeUsage, MAX_PROJECTS } = freshSanitizer();
    expect(MAX_PROJECTS).toBe(9);
    const payload = validUsage();
    payload.projects = Array.from({ length: 11 }, (_, i) => ({ name: `p${i}`, work: i }));
    const projects = sanitizeClaudeUsage(payload).snapshot.projects;
    expect(projects).toHaveLength(9);
    expect(projects.at(-1).name).toBe("p8");
  });

  test("the body ceiling is 64 KiB", () => {
    expect(freshSanitizer().CLAUDE_USAGE_MAX_BODY_BYTES).toBe(CLAUDE_MAX_BODY_BYTES);
  });
});

// --- The gate ---------------------------------------------------------------

describe("POST /claude-usage — authentication", () => {
  test.each([
    ["no Authorization header", null],
    ["a wrong token", "Bearer wrong"],
    ["the workstation ingest token", `Bearer ${INGEST_TOKEN}`],
    ["the read token", `Bearer ${TOKEN}`],
    ["the Claude token without the Bearer scheme", CLAUDE_TOKEN],
    ["a prefix of the Claude token", `Bearer ${CLAUDE_TOKEN.slice(0, -1)}`],
  ])("401 with %s, and nothing is written", async (_label, auth) => {
    const { status, body } = await push({ auth });
    expect(status).toBe(401);
    expect(body.error).toBe("Unauthorized");
    expect(fs.existsSync(usagePath)).toBe(false);
  });

  test("the Claude token does not open POST /hosts/<id>", async () => {
    const { status, body } = await request("/hosts/thinkpad", {
      method: "POST",
      auth: `Bearer ${CLAUDE_TOKEN}`,
      body: "{}",
    });
    expect(status).toBe(401);
    expect(body.error).toBe("Unauthorized");
    expect(fs.existsSync(path.join(process.env.HOSTS_DIR, "thinkpad.json"))).toBe(false);
  });

  test.each(["/claude-usage", "/hosts", "/health", "/defenseurs"])(
    "the Claude token does not open GET %s",
    async (route) => {
      const { status, body } = await request(route, { auth: `Bearer ${CLAUDE_TOKEN}` });
      expect(status).toBe(401);
      expect(body.error).toBe("Unauthorized");
    },
  );

  test("the comparison goes through timingSafeEqual on two digests", async () => {
    const crypto = require("node:crypto");
    const spy = vi.spyOn(crypto, "timingSafeEqual");
    try {
      await restartServer();
      const { status } = await push({ auth: "Bearer x" });
      expect(status).toBe(401);
      expect(spy).toHaveBeenCalledTimes(1);
      const [a, b] = spy.mock.calls[0];
      expect([a.length, b.length]).toEqual([32, 32]);
    } finally {
      spy.mockRestore();
    }
  });
});

describe("GET /claude-usage — authentication", () => {
  test.each([
    ["no Authorization header", null],
    ["a wrong token", "Bearer wrong"],
    ["the workstation ingest token", `Bearer ${INGEST_TOKEN}`],
  ])("401 with %s", async (_label, auth) => {
    const { status, body } = await read(auth);
    expect(status).toBe(401);
    expect(body.error).toBe("Unauthorized");
  });

  test("401 when HEALTH_TOKEN is unset (fail-closed)", async () => {
    delete process.env.HEALTH_TOKEN;
    await restartServer();
    const { status, body } = await read();
    expect(status).toBe(401);
    expect(body.error).toBe("HEALTH_TOKEN not configured");
  });
});

describe("fail-closed — each ingestion token names its own variable", () => {
  test("503 naming CLAUDE_USAGE_INGEST_TOKEN when it is unset", async () => {
    delete process.env.CLAUDE_USAGE_INGEST_TOKEN;
    await restartServer();
    for (const auth of [null, `Bearer ${CLAUDE_TOKEN}`, `Bearer ${INGEST_TOKEN}`]) {
      const { status, body } = await push({ auth });
      expect(status).toBe(503);
      expect(body.error).toBe("CLAUDE_USAGE_INGEST_TOKEN not configured");
    }
    expect(fs.existsSync(usagePath)).toBe(false);
  });

  test("the other routes are unaffected when CLAUDE_USAGE_INGEST_TOKEN is unset", async () => {
    delete process.env.CLAUDE_USAGE_INGEST_TOKEN;
    await restartServer();
    expect((await read()).status).toBe(200);
    expect((await request("/hosts", { auth: `Bearer ${TOKEN}` })).status).toBe(200);
  });

  test("/hosts keeps its 503 naming HOSTS_INGEST_TOKEN, and /claude-usage keeps working", async () => {
    delete process.env.HOSTS_INGEST_TOKEN;
    await restartServer();
    const hosts = await request("/hosts/thinkpad", { method: "POST", auth: `Bearer ${CLAUDE_TOKEN}`, body: "{}" });
    expect(hosts.status).toBe(503);
    expect(hosts.body.error).toBe("HOSTS_INGEST_TOKEN not configured");
    expect((await push()).status).toBe(204);
  });
});

describe("routing", () => {
  test.each([
    ["PUT", "/claude-usage"],
    ["DELETE", "/claude-usage"],
    ["POST", "/claude-usage/"],
    ["POST", "/claude-usage/x"],
    ["GET", "/claude-usage/../hosts/thinkpad.json"],
  ])("404 (not 401) on %s %s without Authorization", async (method, route) => {
    const { status, body } = await request(route, { method });
    expect(status).toBe(404);
    expect(body.error).toBe("Not found");
  });
});

describe("rejections leave an audit trail", () => {
  let warn;

  beforeEach(() => {
    warn = vi.spyOn(console, "warn").mockImplementation(() => {});
  });

  afterEach(() => {
    warn.mockRestore();
  });

  test("a 401 on POST /claude-usage is logged", async () => {
    await push({ auth: "Bearer wrong" });
    const line = warn.mock.calls.at(-1)[0];
    expect(line).toContain("[auth] 401 POST /claude-usage");
    expect(line).toContain("id=-");
    expect(line).toContain("reason=missing or invalid bearer token");
  });

  test("a 401 on GET /claude-usage is logged", async () => {
    await read(null);
    expect(warn.mock.calls.at(-1)[0]).toContain("[auth] 401 GET /claude-usage");
  });

  test("a 503 names its cause in the log", async () => {
    delete process.env.CLAUDE_USAGE_INGEST_TOKEN;
    await restartServer();
    await push();
    expect(warn.mock.calls.at(-1)[0]).toContain("reason=claude usage ingest token not configured");
  });
});

// --- Ingestion --------------------------------------------------------------

describe("POST /claude-usage — the 64 KiB ceiling", () => {
  const claudeAuth = `Bearer ${CLAUDE_TOKEN}`;

  test("a body of exactly 65 536 bytes is accepted, the padding dropped", async () => {
    const body = bodyOfExactly(validUsage(), CLAUDE_MAX_BODY_BYTES);
    expect(Buffer.byteLength(body)).toBe(CLAUDE_MAX_BODY_BYTES);
    const { status } = await push({ body });
    expect(status).toBe(204);
    expect(fs.readFileSync(usagePath, "utf-8")).not.toContain("padding");
  });

  test("a body of 65 537 bytes is refused with 413 and nothing is written", async () => {
    const body = bodyOfExactly(validUsage(), CLAUDE_MAX_BODY_BYTES + 1);
    expect(await pushOversized("/claude-usage", body, claudeAuth)).toBe(413);
    expect(fs.existsSync(usagePath)).toBe(false);
  });

  test("POST /hosts/<id> keeps its own 4 KiB ceiling: 413 at 4 097 bytes", async () => {
    const hostBase = {
      hostname: "thinkpad-x1",
      uptime: 4242,
      cpu: { model: "Intel Core i7", cores: 8, loadAvg: [0.5, 0.4, 0.3], usagePercent: 12 },
      memory: { totalGB: 32, usedGB: 12.5, freeGB: 19.5, usagePercent: 39 },
      disk: { totalGB: 500, usedGB: 220, freeGB: 280, usagePercent: 44 },
    };
    const body = bodyOfExactly(hostBase, HOSTS_MAX_BODY_BYTES + 1);
    expect(await pushOversized("/hosts/thinkpad", body, `Bearer ${INGEST_TOKEN}`)).toBe(413);
  });
});

describe("POST /claude-usage — payload", () => {
  test.each([
    ["truncated JSON", "{not json"],
    ["an empty body", ""],
  ])("400 on %s, nothing written", async (_label, body) => {
    const res = await push({ body });
    expect(res.status).toBe(400);
    expect(res.body.error).toBe("Bad request: body must be valid JSON");
    expect(fs.existsSync(usagePath)).toBe(false);
  });

  test("400 on a JSON array", async () => {
    const res = await push({ body: "[]" });
    expect(res.status).toBe(400);
    expect(res.body.error).toBe("Bad request: body must be a JSON object");
  });

  test("400 on another schemaVersion", async () => {
    const res = await push({ body: JSON.stringify({ ...validUsage(), schemaVersion: 2 }) });
    expect(res.status).toBe(400);
    expect(res.body.error).toBe("Bad request: schemaVersion must be 1");
    expect(fs.existsSync(usagePath)).toBe(false);
  });

  test("204, the file holds the sanitized snapshot plus a server receivedAt, mode 600", async () => {
    const before = Date.now();
    const sent = { ...validUsage(), extra: "dropped", receivedAt: "2000-01-01T00:00:00.000Z" };
    const res = await push({ body: JSON.stringify(sent) });
    expect(res.status).toBe(204);

    const stored = JSON.parse(fs.readFileSync(usagePath, "utf-8"));
    const { receivedAt, ...snapshot } = stored;
    expect(snapshot).toEqual(validUsage());
    // A client-supplied receivedAt is ignored: the server stamps it.
    expect(new Date(receivedAt).getTime()).toBeGreaterThanOrEqual(before - 1000);
    expect(fs.statSync(usagePath).mode & 0o777).toBe(0o600);
    // Atomic write: no temp file left beside the snapshot. history/ holds the
    // closed day of this two-day snapshot (#55, claude-usage-history.test.js).
    expect(fs.readdirSync(path.dirname(usagePath)).sort()).toEqual(["claude-usage.json", "history"]);
  });

  test("a second push replaces the first", async () => {
    await push();
    const second = { ...validUsage(), claudeCodeVersion: "2.1.284" };
    expect((await push({ body: JSON.stringify(second) })).status).toBe(204);
    expect(JSON.parse(fs.readFileSync(usagePath, "utf-8")).claudeCodeVersion).toBe("2.1.284");
  });

  test("500 when the rename fails after the temp file is written, and the temp file is removed", async () => {
    // The target is a non-empty directory: mkdir and the temp write succeed,
    // renameSync fails. Only the cleanup in writeJsonAtomic() removes the
    // temp file (#54: the mkdir case below never reaches it).
    fs.mkdirSync(path.join(usagePath, "occupied"), { recursive: true });
    const error = vi.spyOn(console, "error").mockImplementation(() => {});
    try {
      const res = await push();
      expect(res.status).toBe(500);
      expect(res.body.error).toBe("Internal error");
    } finally {
      error.mockRestore();
    }
    expect(fs.readdirSync(path.dirname(usagePath))).toEqual(["claude-usage.json"]);
    expect(fs.readdirSync(usagePath)).toEqual(["occupied"]);
  });

  test("500 when the snapshot cannot be written, and no temp file is left", async () => {
    // The parent of the file is a regular file: mkdir fails, nothing lands.
    const blocker = path.join(tmpDir, "blocker");
    fs.writeFileSync(blocker, "");
    process.env.CLAUDE_USAGE_PATH = path.join(blocker, "claude-usage.json");
    await restartServer();
    const error = vi.spyOn(console, "error").mockImplementation(() => {});
    try {
      const res = await push();
      expect(res.status).toBe(500);
      expect(res.body.error).toBe("Internal error");
    } finally {
      error.mockRestore();
    }
  });
});

// --- Reading ----------------------------------------------------------------

describe("GET /claude-usage", () => {
  test("no file -> { status: \"no_data\" }", async () => {
    const res = await read();
    expect(res.status).toBe(200);
    expect(res.body).toEqual({ status: "no_data" });
  });

  test("POST then GET: identical snapshot, receivedAt, ageSeconds, stale", async () => {
    const sent = { ...validUsage(), extra: "dropped" };
    expect((await push({ body: JSON.stringify(sent) })).status).toBe(204);
    const stored = JSON.parse(fs.readFileSync(usagePath, "utf-8"));

    const res = await read();
    expect(res.status).toBe(200);
    expect(Object.keys(res.body).sort()).toEqual(["ageSeconds", "receivedAt", "snapshot", "stale", "staleAfterSeconds"]);
    expect(res.body.snapshot).toEqual(validUsage());
    expect(res.body.receivedAt).toBe(stored.receivedAt);
    expect(res.body.ageSeconds).toBeGreaterThanOrEqual(0);
    expect(res.body.ageSeconds).toBeLessThan(5);
    expect(res.body.stale).toBe(false);
    expect(res.body.staleAfterSeconds).toBe(DEFAULT_STALE_SECONDS);
  });

  test.each([
    [DEFAULT_STALE_SECONDS - 1, false],
    [DEFAULT_STALE_SECONDS, false],
    [DEFAULT_STALE_SECONDS + 1, true],
  ])("aged %i s -> stale %s (server clock, exact boundary)", async (age, stale) => {
    writeStored({ ...validUsage(), receivedAt: new Date(FROZEN_NOW - age * 1000).toISOString() });
    const res = await frozenRead();
    expect(res.body.ageSeconds).toBe(age);
    expect(res.body.stale).toBe(stale);
  });

  test("CLAUDE_USAGE_STALE_SECONDS moves the boundary", async () => {
    process.env.CLAUDE_USAGE_STALE_SECONDS = "60";
    await restartServer();
    writeStored({ ...validUsage(), receivedAt: new Date(FROZEN_NOW - 61 * 1000).toISOString() });
    const res = await frozenRead();
    expect(res.body.staleAfterSeconds).toBe(60);
    expect(res.body.stale).toBe(true);
  });

  test.each(["0", "-5", "abc"])("an invalid CLAUDE_USAGE_STALE_SECONDS (%s) falls back to 2700", async (value) => {
    process.env.CLAUDE_USAGE_STALE_SECONDS = value;
    await restartServer();
    writeStored({ ...validUsage(), receivedAt: new Date(FROZEN_NOW).toISOString() });
    expect((await frozenRead()).body.staleAfterSeconds).toBe(DEFAULT_STALE_SECONDS);
  });

  test("a receivedAt in the future reads as age 0, not negative", async () => {
    writeStored({ ...validUsage(), receivedAt: new Date(FROZEN_NOW + 60000).toISOString() });
    const res = await frozenRead();
    expect(res.body.ageSeconds).toBe(0);
    expect(res.body.stale).toBe(false);
  });

  test("the stored file is re-sanitized on the way out", async () => {
    const raw = validUsage();
    raw.extra = "<script>";
    raw.limits.detail = "HTTP 500 body";
    raw.projects[0].work = -1;
    writeStored({ ...raw, receivedAt: new Date(FROZEN_NOW).toISOString() });
    const { body } = await frozenRead();
    expect(body.snapshot).not.toHaveProperty("extra");
    expect(body.snapshot.limits).not.toHaveProperty("detail");
    expect(body.snapshot.projects[0]).not.toHaveProperty("work");
    expect(body.snapshot).not.toHaveProperty("receivedAt");
  });

  describe("degrades to no_data", () => {
    let error;

    beforeEach(() => {
      error = vi.spyOn(console, "error").mockImplementation(() => {});
    });

    afterEach(() => {
      error.mockRestore();
    });

    test.each([
      ["a corrupt file", "{corrupt"],
      ["an array", "[]"],
      ["another schemaVersion", JSON.stringify({ ...validUsage(), schemaVersion: 2, receivedAt: "2026-09-27T19:00:00.000Z" })],
      ["no receivedAt", JSON.stringify(validUsage())],
      ["an unusable receivedAt", JSON.stringify({ ...validUsage(), receivedAt: "never" })],
      // new Date() reads all three; the server only ever stamps a full ISO
      // timestamp with an offset, so anything else was not written by it (#54).
      ["a receivedAt of \"1\"", JSON.stringify({ ...validUsage(), receivedAt: "1" })],
      ["a date-only receivedAt", JSON.stringify({ ...validUsage(), receivedAt: "2026-10-07" })],
      ["a receivedAt without an offset", JSON.stringify({ ...validUsage(), receivedAt: "2026-10-07T12:00:00" })],
    ])("on %s", async (_label, raw) => {
      writeStored(raw);
      const res = await read();
      expect(res.status).toBe(200);
      expect(res.body).toEqual({ status: "no_data" });
    });

    test("when the path is a directory", async () => {
      fs.mkdirSync(usagePath, { recursive: true });
      const res = await read();
      expect(res.body).toEqual({ status: "no_data" });
    });
  });
});

describe("the server image", () => {
  test("the Dockerfile COPY line ships claude-usage.js", () => {
    const dockerfile = fs.readFileSync(path.join(__dirname, "..", "Dockerfile"), "utf-8");
    const copy = dockerfile.split("\n").find((line) => /^\s*COPY\s/.test(line));
    expect(copy.trim().split(/\s+/)).toContain("claude-usage.js");
  });
});