import { expect, it, mock } from "bun:test";
import { createTaskCalculationWaiter } from "../../src/mcp/task-calculation-waiter.js";
const owner = { context: { sessionId: "s", clientSessionId: "c", actorKey: "a", projectKey: "p", projectId: "p", traceId: "t", purpose: "task_execution" as const }, runtimeSessionId: "s" };
const result = (status: string) => ({ content: [], structuredContent: { data: [{ job_id: "job-1", status, poll_after_ms: 1500 }], page: { has_more: false } } });
it("waits in the host across bounded status reads then resumes once for terminal results", async () => {
  const outputs = [result("queued"), result("running"), result("succeeded"), result("succeeded")];
  const query = mock(async () => outputs.shift()!);
  const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
  const wait = createTaskCalculationWaiter({ query }, () => owner, pause);
  const signal = new AbortController().signal;
  expect(await wait("s", signal)).toContain("get_calculation_result");
  expect(pause).toHaveBeenCalledTimes(2);
  expect(pause.mock.calls[0]?.[0]).toBe(1500);
  expect(await wait("s", signal)).toBeNull();
  expect(query).toHaveBeenCalledTimes(4);
});
it("does not turn unavailable status into a completed task", async () => {
  const query = mock(async () => ({ content: [], isError: true }));
  await expect(createTaskCalculationWaiter({ query }, () => owner)("s", new AbortController().signal)).rejects.toThrow("unavailable");
});
it("aborts host waiting without issuing Server cancellation", async () => {
  const controller = new AbortController();
  const names: string[] = [];
  const query = mock(async (_id: string, _owner: unknown, name: string) => { names.push(name); return result("running"); });
  const wait = createTaskCalculationWaiter({ query }, () => owner, async () => { controller.abort(); });
  await expect(wait("s", controller.signal)).rejects.toThrow();
  expect(names).toEqual(["list_calculation_jobs"]);
});

it("resumes recovery for a worker-interrupted job instead of waiting or completing silently", async () => {
  const query = mock(async () => result("interrupted"));
  const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
  const wait = createTaskCalculationWaiter({ query }, () => owner, pause);
  const resume = await wait("s", new AbortController().signal);
  expect(resume).toContain("interrupted");
  expect(resume).toContain("不要重复提交");
  expect(pause).not.toHaveBeenCalled();
});

for (const failure of [
  Object.assign(new TypeError("fetch failed"), { cause: { code: "ECONNRESET" } }),
  new DOMException("Timed out", "TimeoutError"),
  Object.assign(new Error("busy"), { status: 429 }),
  Object.assign(new Error("unavailable"), { status: 503 }),
  ...["RATE_LIMITED", "QUERY_TIMEOUT", "SOURCE_UNAVAILABLE"].map((code) => ({ content: [], isError: true, structuredContent: { error: { code } } })),
]) {
  it(`retries transient status failures (${"name" in failure ? failure.name : failure.structuredContent.error.code})`, async () => {
    let calls = 0;
    const query = mock(async () => {
      if (calls++ === 0) { if (failure instanceof Error || failure instanceof DOMException) throw failure; return failure; }
      return result("succeeded");
    });
    const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
    const wait = createTaskCalculationWaiter({ query }, () => owner, pause, () => 0.5);
    expect(await wait("s", new AbortController().signal)).toContain("succeeded");
    expect(pause.mock.calls.map(([ms]) => ms)).toEqual([1000]);
    expect(query).toHaveBeenCalledTimes(2);
  });
}

it("bounds exponential retry delays and fails clearly after exhaustion", async () => {
  const names: string[] = [];
  const query = mock(async (_id: string, _owner: unknown, name: string) => {
    names.push(name);
    throw Object.assign(new Error("unavailable"), { status: 503 });
  });
  const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
  const wait = createTaskCalculationWaiter({ query }, () => owner, pause, () => 1);
  await expect(wait("s", new AbortController().signal)).rejects.toThrow("after transient retries");
  expect(pause.mock.calls.map(([ms]) => ms)).toEqual([1250, 2500, 5000]);
  expect(names).toEqual(Array(4).fill("list_calculation_jobs"));
});

for (const failure of [
  Object.assign(new Error("denied"), { status: 401 }),
  Object.assign(new Error("denied"), { status: 403 }),
  ...["AUTH_REQUIRED", "QUERY_CONTEXT_DENIED", "QUERY_CONTEXT_STALE"].map((code) => ({ content: [], isError: true, structuredContent: { error: { code } } })),
]) {
  it("fails authorization and stale context errors without retrying", async () => {
    const query = mock(async () => { if (failure instanceof Error) throw failure; return failure; });
    const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
    await expect(createTaskCalculationWaiter({ query }, () => owner, pause)("s", new AbortController().signal)).rejects.toThrow();
    expect(query).toHaveBeenCalledTimes(1);
    expect(pause).not.toHaveBeenCalled();
  });
}

it("aborts retry backoff without reading again or cancelling jobs", async () => {
  const controller = new AbortController();
  const names: string[] = [];
  const query = mock(async (_id: string, _owner: unknown, name: string) => {
    names.push(name);
    throw new DOMException("Timed out", "TimeoutError");
  });
  const wait = createTaskCalculationWaiter({ query }, () => owner, async () => { controller.abort(); });
  await expect(wait("s", controller.signal)).rejects.toThrow();
  expect(names).toEqual(["list_calculation_jobs"]);
});

it("returns new terminal jobs while other jobs remain pending and checks pending jobs next round", async () => {
  const mixed = { content: [], structuredContent: { data: [{ job_id: "job-1", status: "succeeded" }, { job_id: "job-2", status: "running" }], page: { has_more: false } } };
  const finished = { content: [], structuredContent: { data: [{ job_id: "job-1", status: "succeeded" }, { job_id: "job-2", status: "failed" }], page: { has_more: false } } };
  const outputs = [mixed, mixed, finished];
  const query = mock(async () => outputs.shift()!);
  const pause = mock(async (_ms: number, _signal: AbortSignal) => {});
  const wait = createTaskCalculationWaiter({ query }, () => owner, pause);
  const signal = new AbortController().signal;
  const first = await wait("s", signal);
  expect(first).toContain("job-1");
  expect(first).not.toContain("job-2");
  expect(pause).not.toHaveBeenCalled();
  const second = await wait("s", signal);
  expect(second).toContain("job-2");
  expect(second).not.toContain("job-1");
  expect(pause).toHaveBeenCalledTimes(1);
});