import assert from "node:assert/strict";
import test from "node:test";
import {
  CodeWhaleRuntimeClient,
  RuntimeApiError,
  RuntimeCapabilityError,
  createRuntimeClient,
} from "../index.js";

function jsonResponse(body, init = {}) {
  return new Response(JSON.stringify(body), {
    status: init.status ?? 200,
    headers: { "content-type": "application/json", ...(init.headers ?? {}) },
  });
}

function fakeFetch(responseFactory) {
  const calls = [];
  const fetch = async (url, init) => {
    calls.push({ url: url.toString(), init });
    return responseFactory(url, init, calls.length);
  };
  fetch.calls = calls;
  return fetch;
}

test("listFleetRuns calls the Runtime API with bearer auth", async () => {
  const fetch = fakeFetch(() =>
    jsonResponse({
      status: { runs: 1, workers: {} },
      runs: [{ id: "run-1", name: "smoke", tasks: [], labels: {} }],
    }),
  );
  const client = createRuntimeClient({
    baseUrl: "http://127.0.0.1:7878",
    token: "token-1",
    fetch,
  });

  const response = await client.listFleetRuns();

  assert.equal(response.runs[0].id, "run-1");
  assert.equal(fetch.calls[0].url, "http://127.0.0.1:7878/v1/fleet/runs");
  assert.equal(fetch.calls[0].init.method, "GET");
  assert.equal(fetch.calls[0].init.headers.get("authorization"), "Bearer token-1");
});

test("worker and run actions use POST endpoints", async () => {
  const fetch = fakeFetch((url) =>
    jsonResponse(
      url.pathname.endsWith("/stop")
        ? {
            action: "stop",
            run_id: "run-1",
            stopped: 1,
            status: { runs: 1, workers: {} },
          }
        : {
            action: url.pathname.endsWith("/restart") ? "restart" : "interrupt",
            worker: { worker_id: "w1", artifacts: [] },
          },
    ),
  );
  const client = new CodeWhaleRuntimeClient({ fetch });

  await client.interruptWorker("w1");
  await client.restartWorker("w1");
  await client.stopFleetRun("run-1");

  assert.deepEqual(
    fetch.calls.map((call) => [new URL(call.url).pathname, call.init.method]),
    [
      ["/v1/fleet/workers/w1/interrupt", "POST"],
      ["/v1/fleet/workers/w1/restart", "POST"],
      ["/v1/fleet/runs/run-1/stop", "POST"],
    ],
  );
});

test("unsupported fleet capabilities raise typed errors", async () => {
  const fetch = fakeFetch(() => jsonResponse({ error: "not found" }, { status: 404 }));
  const client = new CodeWhaleRuntimeClient({ fetch });

  await assert.rejects(
    () => client.createFleetRun({ name: "future" }),
    (error) =>
      error instanceof RuntimeCapabilityError &&
      error.capability === "fleet_run_create" &&
      error.status === 404,
  );

  await assert.rejects(
    async () => {
      for await (const _event of client.fleetEvents("run-1")) {
        throw new Error("unexpected event");
      }
    },
    (error) =>
      error instanceof RuntimeCapabilityError &&
      error.capability === "fleet_event_stream" &&
      error.status === 404,
  );
});

test("fleetEvents can replay JSON event fixtures when the API exposes them", async () => {
  const fetch = fakeFetch(() =>
    jsonResponse({
      events: [
        {
          seq: 1,
          run_id: "run-1",
          worker_id: "w1",
          task_id: "task-1",
          timestamp: "2026-06-13T00:00:00Z",
          label: "running",
          payload: { state: "running" },
        },
      ],
    }),
  );
  const client = new CodeWhaleRuntimeClient({ fetch });

  const events = [];
  for await (const event of client.fleetEvents("run-1", { path: "/v1/fleet/runs/run-1/events" })) {
    events.push(event);
  }

  assert.equal(events.length, 1);
  assert.equal(events[0].payload.state, "running");
});

test("fleetEvents parses text/event-stream frames", async () => {
  const encoder = new TextEncoder();
  const body = new ReadableStream({
    start(controller) {
      controller.enqueue(
        encoder.encode(
          'data: {"seq":2,"run_id":"run-1","worker_id":"w1","task_id":"task-1","timestamp":"2026-06-13T00:00:01Z","label":"heartbeat","payload":{"state":"heartbeat","memory_mb":128}}\n\n',
        ),
      );
      controller.close();
    },
  });
  const fetch = fakeFetch(
    () =>
      new Response(body, {
        status: 200,
        headers: { "content-type": "text/event-stream" },
      }),
  );
  const client = new CodeWhaleRuntimeClient({ fetch });

  const events = [];
  for await (const event of client.fleetEvents("run-1")) {
    events.push(event);
  }

  assert.equal(events.length, 1);
  assert.equal(events[0].payload.state, "heartbeat");
  assert.equal(events[0].payload.memory_mb, 128);
});

test("ordinary HTTP errors remain RuntimeApiError", async () => {
  const fetch = fakeFetch(() => jsonResponse({ error: "bad" }, { status: 500 }));
  const client = new CodeWhaleRuntimeClient({ fetch });

  await assert.rejects(
    () => client.getFleetRun("run-1"),
    (error) =>
      error instanceof RuntimeApiError &&
      !(error instanceof RuntimeCapabilityError) &&
      error.status === 500,
  );
});