/**
 * @file cc-usage.test.js
 * @description Tests for per-profile quota lookup.
 *
 * Two properties carry the whole feature. A profile's refreshed OAuth tokens
 * must be written back — the exchange retires the refresh token it was given,
 * so dropping the result leaves an account the user has to log into again. And
 * a still-valid token must NOT be refreshed, because every refresh rewrites
 * credentials on disk and the point of a read is to read.
 *
 * `fetch` is stubbed throughout: nothing here talks to Anthropic.
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, beforeEach, afterEach, after } = require("node:test");
const assert = require("node:assert/strict");
const fs = require("node:fs");
const path = require("node:path");
const os = require("node:os");

const TMP = fs.mkdtempSync(path.join(os.tmpdir(), "cc-usage-"));
process.env.CLAUDE_HOME = TMP;

const profiles = require("../lib/cc-profiles");
const usage = require("../lib/cc-usage");

const realFetch = global.fetch;
let calls = [];

after(() => {
  global.fetch = realFetch;
  try {
    fs.rmSync(TMP, { recursive: true, force: true, maxRetries: 5 });
  } catch {
    /* best-effort temp cleanup */
  }
});

function writeProfileFile(name, credentials) {
  const dir = profiles.profilesDir();
  fs.mkdirSync(dir, { recursive: true });
  fs.writeFileSync(
    path.join(dir, `${name}.json`),
    JSON.stringify({
      name,
      label: "Label kept",
      savedAt: 1,
      account: { emailAddress: "a@b.c" },
      credentials,
    })
  );
}

/** Answer the token endpoint and the usage endpoint, recording both. */
function stubFetch({ usageStatus = 200, usageBody } = {}) {
  global.fetch = async (url, init) => {
    calls.push({ url: String(url), init });
    if (String(url).includes("/v1/oauth/token")) {
      return {
        ok: true,
        status: 200,
        text: async () =>
          JSON.stringify({
            access_token: "fresh-access",
            refresh_token: "rotated-refresh",
            expires_in: 28800,
          }),
      };
    }
    return {
      ok: usageStatus === 200,
      status: usageStatus,
      json: async () =>
        usageBody || {
          five_hour: { utilization: 48.0, resets_at: "2026-09-17T13:00:00Z" },
          seven_day: { utilization: 66.0, resets_at: "2026-09-21T08:00:00Z" },
          seven_day_opus: null,
        },
    };
  };
}

beforeEach(() => {
  calls = [];
  fs.rmSync(profiles.profilesDir(), { recursive: true, force: true });
});

afterEach(() => {
  global.fetch = realFetch;
});

describe("profileUsage", () => {
  it("reports the two windows, and only those", async () => {
    writeProfileFile("live", {
      accessToken: "still-good",
      refreshToken: "r",
      expiresAt: Date.now() + 3_600_000,
    });
    stubFetch();

    const result = await usage.profileUsage("live");

    assert.deepEqual(result.fiveHour, { utilization: 48, resetsAt: "2026-09-17T13:00:00Z" });
    assert.deepEqual(result.sevenDay, { utilization: 66, resetsAt: "2026-09-21T08:00:00Z" });
    // Nothing token-shaped may be in what a route is about to serialise.
    assert.equal(JSON.stringify(result).includes("still-good"), false);
  });

  it("does not refresh a token that is still valid", async () => {
    writeProfileFile("live", {
      accessToken: "still-good",
      refreshToken: "r",
      expiresAt: Date.now() + 3_600_000,
    });
    stubFetch();

    const result = await usage.profileUsage("live");

    assert.equal(result.refreshed, false);
    assert.equal(
      calls.some((c) => c.url.includes("/v1/oauth/token")),
      false,
      "a read must not rewrite credentials on disk"
    );
    assert.match(calls[0].init.headers.Authorization, /still-good/);
  });

  it("refreshes an expired token and WRITES THE ROTATED PAIR BACK", async () => {
    // The exchange retires the refresh token it was handed. A refresh whose
    // result is not persisted leaves the profile holding a dead credential —
    // the account could never be activated again without a fresh login.
    writeProfileFile("stale", {
      accessToken: "expired",
      refreshToken: "original-refresh",
      expiresAt: Date.now() - 1000,
      subscriptionType: "team",
    });
    stubFetch();

    const result = await usage.profileUsage("stale");

    assert.equal(result.refreshed, true);
    const stored = profiles.readProfile("stale");
    assert.equal(stored.credentials.accessToken, "fresh-access");
    assert.equal(stored.credentials.refreshToken, "rotated-refresh");
    assert.ok(stored.credentials.expiresAt > Date.now());
    // Everything else about the profile survives the rewrite.
    assert.equal(stored.label, "Label kept");
    assert.equal(stored.credentials.subscriptionType, "team");
    assert.equal(stored.account.emailAddress, "a@b.c");
  });

  it("retries once through a refresh when a token that looked valid is refused", async () => {
    writeProfileFile("revoked", {
      accessToken: "revoked-but-unexpired",
      refreshToken: "original-refresh",
      expiresAt: Date.now() + 3_600_000,
    });
    let first = true;
    global.fetch = async (url) => {
      calls.push({ url: String(url) });
      if (String(url).includes("/v1/oauth/token")) {
        return {
          ok: true,
          status: 200,
          text: async () =>
            JSON.stringify({ access_token: "fresh", refresh_token: "rot", expires_in: 100 }),
        };
      }
      if (first) {
        first = false;
        return { ok: false, status: 401, json: async () => ({}) };
      }
      return {
        ok: true,
        status: 200,
        json: async () => ({ five_hour: { utilization: 1, resets_at: null }, seven_day: null }),
      };
    };

    const result = await usage.profileUsage("revoked");

    assert.equal(result.refreshed, true);
    assert.deepEqual(result.fiveHour, { utilization: 1, resetsAt: null });
  });

  it("refuses a profile with no refresh token instead of half-answering", async () => {
    writeProfileFile("tokenless", { accessToken: "expired", expiresAt: Date.now() - 1000 });
    stubFetch();

    await assert.rejects(
      () => usage.profileUsage("tokenless"),
      (e) => e.code === "ENOREFRESH"
    );
  });

  it("uses the CLI's own token for the account that is logged in, not the saved copy", async () => {
    // The saved copy of the LIVE account is the one set of credentials certain
    // to fail: the CLI has refreshed since, and that retired the refresh token
    // sitting in the profile file. Refreshing it here would also rotate the
    // token the user's terminal is using.
    const account = { accountUuid: "uuid-live", emailAddress: "a@b.c" };
    fs.mkdirSync(profiles.profilesDir(), { recursive: true });
    fs.writeFileSync(
      path.join(profiles.profilesDir(), "mine.json"),
      JSON.stringify({
        name: "mine",
        account,
        credentials: { accessToken: "retired", refreshToken: "retired-r", expiresAt: 1 },
      })
    );
    fs.writeFileSync(
      path.join(TMP, ".credentials.json"),
      JSON.stringify({
        claudeAiOauth: {
          accessToken: "live-token",
          refreshToken: "live-r",
          expiresAt: Date.now() + 3_600_000,
        },
      })
    );
    fs.writeFileSync(path.join(TMP, ".claude.json"), JSON.stringify({ oauthAccount: account }));
    stubFetch();

    const result = await usage.profileUsage("mine");

    assert.equal(result.refreshed, false);
    assert.match(calls[0].init.headers.Authorization, /live-token/);
    assert.equal(
      calls.some((c) => c.url.includes("/v1/oauth/token")),
      false,
      "refreshing the live account would log the user's own terminal out"
    );
    fs.rmSync(path.join(TMP, ".credentials.json"));
    fs.rmSync(path.join(TMP, ".claude.json"));
  });

  it("names a spent refresh token instead of echoing the upstream 400", async () => {
    writeProfileFile("superseded", {
      accessToken: "expired",
      refreshToken: "already-rotated",
      expiresAt: Date.now() - 1000,
    });
    global.fetch = async (url) => {
      calls.push({ url: String(url) });
      return {
        ok: false,
        status: 400,
        text: async () => '{"error": "invalid_grant", "error_description": "not found"}',
      };
    };

    await assert.rejects(
      () => usage.profileUsage("superseded"),
      (e) => e.code === "ESTALE" && /save the profile again/.test(e.message)
    );
  });

  it("reports an unknown profile as ENOTFOUND", async () => {
    stubFetch();
    await assert.rejects(
      () => usage.profileUsage("nope"),
      (e) => e.code === "ENOTFOUND"
    );
  });
});