import test from "node:test";
import assert from "node:assert/strict";
import { createServer } from "node:http";
import { spawn } from "node:child_process";
import { mkdtemp, mkdir, readFile, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { fileURLToPath } from "node:url";

const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");

async function startMockControlPlane() {
  let resolveHeartbeat;
  const heartbeatReceived = new Promise((resolve) => {
    resolveHeartbeat = resolve;
  });

  const server = createServer(async (request, response) => {
    const chunks = [];
    for await (const chunk of request) {
      chunks.push(chunk);
    }

    const bodyText = Buffer.concat(chunks).toString("utf8");
    if (request.method === "POST" && request.url === "/api/device-heartbeat") {
      resolveHeartbeat({
        headers: request.headers,
        bodyText,
      });
    }

    response.writeHead(200, { "content-type": "application/json" });
    response.end(JSON.stringify({ ok: true }));
  });

  await new Promise((resolve) => {
    server.listen(0, "127.0.0.1", resolve);
  });

  const address = server.address();
  if (!address || typeof address === "string") {
    throw new Error("failed to bind mock control plane");
  }

  return {
    server,
    port: address.port,
    heartbeatReceived,
  };
}

test("local-agent heartbeat reports gui and cli capability state", async () => {
  const runtimeRoot = await mkdtemp(path.join(os.tmpdir(), "boss-local-agent-heartbeat-capabilities-"));
  const skillsDir = path.join(runtimeRoot, "skills");
  await mkdir(skillsDir, { recursive: true });

  const mockControlPlane = await startMockControlPlane();
  const exampleConfig = JSON.parse(
    await readFile(path.join(repoRoot, "local-agent", "config.example.json"), "utf8"),
  );
  const configPath = path.join(runtimeRoot, "config.json");
  await writeFile(
    configPath,
    JSON.stringify(
      {
        ...exampleConfig,
        bindHost: "127.0.0.1",
        port: 0,
        controlPlaneUrl: `http://127.0.0.1:${mockControlPlane.port}`,
        heartbeatIntervalMs: 60_000,
        masterAgentPollIntervalMs: 60_000,
        masterAgentEnabled: false,
        codexSessionDiscoveryEnabled: false,
        projects: [],
        projectCandidates: [],
        skillsDir,
      },
      null,
      2,
    ),
    "utf8",
  );

  const child = spawn(process.execPath, ["local-agent/server.mjs", configPath], {
    cwd: repoRoot,
    stdio: ["ignore", "pipe", "pipe"],
  });

  let stderr = "";
  child.stderr.on("data", (chunk) => {
    stderr += String(chunk);
  });

  try {
    const heartbeatRequest = await Promise.race([
      mockControlPlane.heartbeatReceived,
      new Promise((_, reject) => {
        setTimeout(() => {
          reject(new Error(`timed out waiting for heartbeat\n${stderr}`));
        }, 8000);
      }),
    ]);

    const payload = JSON.parse(heartbeatRequest.bodyText);

    assert.ok(payload.capabilities, "heartbeat payload should include device capabilities");
    assert.equal(payload.capabilities.gui.connected, false);
    assert.equal(payload.capabilities.cli.connected, true);
    assert.equal(payload.preferredExecutionMode, "cli");
  } finally {
    child.kill("SIGTERM");
    await new Promise((resolve) => {
      child.once("close", resolve);
    }).catch(() => null);
    await new Promise((resolve) => {
      mockControlPlane.server.close(resolve);
    });
    await rm(runtimeRoot, { recursive: true, force: true });
  }
});