import { describe, expect, it } from "bun:test";
import { CredentialRefreshCoordinator, runWithCredentialRefresh, bindSessionCredential, credentialRefreshCoordinator, refreshSessionCredential, releaseSessionCredential, requestWithSessionCredential } from "../../src/product/credential-refresh.js";

describe("credential renewal", () => {
  it("rejects stale replies and stops repeated requests when the renewed credential is still rejected", async () => {
    const session = "rejected-credential-session";
    bindSessionCredential(session, { authorization: "Bearer OLD", projectId: "p" });
    let calls = 0;
    let failures = 0;
    const unsubscribe = credentialRefreshCoordinator.subscribe(session, (event) => {
      if (event.type === "credential_refresh_required") {
        expect(refreshSessionCredential(session, { authorization: "Bearer NEW", projectId: "other" }, event.requestId)).toBeFalse();
        expect(refreshSessionCredential(session, { authorization: "Bearer NEW", projectId: "p" }, "stale")).toBeFalse();
        refreshSessionCredential(session, { authorization: "Bearer NEW", projectId: "p" }, event.requestId);
      } else if (event.type === "credential_refresh_failed") failures += 1;
    });
    try {
      expect((await requestWithSessionCredential(session, async () => { calls += 1; return new Response(null, { status: 401 }); })).status).toBe(401);
      await expect(requestWithSessionCredential(session, async () => { calls += 1; return new Response(null, { status: 200 }); })).rejects.toThrow("renewal failed");
      expect(calls).toBe(2);
      expect(failures).toBe(1);
    } finally { unsubscribe(); releaseSessionCredential(session); }
  });
  it("coalesces concurrent 401 responses, resumes both calls, and retries only once", async () => {
    const coordinator = new CredentialRefreshCoordinator(1000);
    const old = { authorization: "Bearer TEST_OLD", projectId: "p" };
    const renewed = { authorization: "Bearer TEST_NEW", projectId: "p" };
    let requests = 0;
    coordinator.subscribe("s", (event) => {
      if (event.type === "credential_refresh_required") {
        requests += 1;
        queueMicrotask(() => coordinator.resolve("s", event.requestId, renewed));
      }
    });
    const calls: string[] = [];
    const execute = async (credential: typeof old) => {
      calls.push(credential.authorization);
      return { status: credential.authorization === old.authorization ? 401 : 200 };
    };
    expect((await Promise.all([runWithCredentialRefresh(coordinator, "s", old, execute), runWithCredentialRefresh(coordinator, "s", old, execute)])).map((result) => result.status)).toEqual([200, 200]);
    expect(requests).toBe(1);
    expect(calls).toHaveLength(4);
  });
  it("does not refresh 403 and fails when refresh is unavailable or cancelled", async () => {
    const coordinator = new CredentialRefreshCoordinator(1000);
    const credential = { authorization: "Bearer TEST", projectId: "p" };
    expect((await runWithCredentialRefresh(coordinator, "s", credential, async () => ({ status: 403 }))).status).toBe(403);
    await expect(runWithCredentialRefresh(coordinator, "s", credential, async () => ({ status: 401 }))).rejects.toThrow("unavailable");
    coordinator.enableBackground("s");
    const pending = coordinator.request("s", "access_token_expired");
    coordinator.cancelSession("s");
    await expect(pending).rejects.toThrow("cancelled");
  });
  it("renews before near-expiry execution and exposes the same pending request for reconnect", async () => {
    const coordinator = new CredentialRefreshCoordinator(1000);
    const old = { authorization: "Bearer OLD", projectId: "p", expiresAt: new Date(Date.now() + 1000).toISOString() };
    coordinator.subscribe("s", (event) => {
      if (event.type === "credential_refresh_required") {
        expect(coordinator.getPendingEvent("s")?.requestId).toBe(event.requestId);
        coordinator.resolve("s", event.requestId, { authorization: "Bearer NEW", projectId: "p" });
      }
    });
    expect(await runWithCredentialRefresh(coordinator, "s", old, async (credential) => ({ status: 200, authorization: credential.authorization }))).toMatchObject({ authorization: "Bearer NEW" });
  });
});