#!/usr/bin/env node

const assert = require("assert");
const cp = require("child_process");
const net = require("net");
const path = require("path");

const repo = path.resolve(__dirname, "..");
const project = path.join(repo, "examples/launch-build-demo");

function waitForJsonLine(child) {
  return new Promise((resolve, reject) => {
    let buffer = "";
    child.stdout.on("data", (chunk) => {
      buffer += chunk.toString();
      const newline = buffer.indexOf("\n");
      if (newline < 0) return;
      const line = buffer.slice(0, newline).trim();
      try {
        resolve(JSON.parse(line));
      } catch (error) {
        reject(error);
      }
    });
    child.once("exit", (code) => {
      reject(new Error(`process exited before JSON line with code ${code}`));
    });
  });
}

function send(addr, message) {
  return new Promise((resolve, reject) => {
    const socket = net.connect(addr.port, addr.host, () => {
      socket.write(`${JSON.stringify(message)}\n`);
    });
    let buffer = "";
    socket.on("data", (chunk) => {
      buffer += chunk.toString();
      const newline = buffer.indexOf("\n");
      if (newline < 0) return;
      socket.end();
      try {
        resolve(JSON.parse(buffer.slice(0, newline)));
      } catch (error) {
        reject(error);
      }
    });
    socket.on("error", reject);
  });
}

function runNode(addr, enrollmentGrant) {
  return new Promise((resolve, reject) => {
    const child = cp.spawn(
      "cargo",
      [
        "run",
        "-q",
        "-p",
        "disasmer-node",
        "--bin",
        "disasmer-node",
        "--",
        "--coordinator",
        `${addr.host}:${addr.port}`,
        "--tenant",
        "tenant",
        "--project-id",
        "project",
        "--node",
        "node-a",
        "--enrollment-grant",
        enrollmentGrant,
        "--public-key",
        "node-a-public-key",
        "--process",
        "vp-local",
        "--task",
        "compile-linux",
        "--project",
        project,
        "--artifact",
        "/vfs/artifacts/demo-test-output.txt"
      ],
      { cwd: repo }
    );
    const nodePid = child.pid;
    let stdout = "";
    let stderr = "";
    child.stdout.on("data", (chunk) => {
      stdout += chunk.toString();
    });
    child.stderr.on("data", (chunk) => {
      stderr += chunk.toString();
    });
    child.on("exit", (code) => {
      if (code !== 0) {
        reject(new Error(`node process failed with code ${code}\n${stderr}`));
        return;
      }
      try {
        resolve({ pid: nodePid, report: JSON.parse(stdout.trim().split("\n").at(-1)) });
      } catch (error) {
        reject(new Error(`node output was not JSON: ${stdout}\n${error.stack || error.message}`));
      }
    });
  });
}

(async () => {
  const coordinator = cp.spawn(
    "cargo",
    [
      "run",
      "-q",
      "-p",
      "disasmer-coordinator",
      "--bin",
      "disasmer-coordinator",
      "--",
      "--listen",
      "127.0.0.1:0"
    ],
    { cwd: repo }
  );
  assert(Number.isInteger(coordinator.pid));
  let coordinatorStderr = "";
  coordinator.stderr.on("data", (chunk) => {
    coordinatorStderr += chunk.toString();
  });

  try {
    const ready = await waitForJsonLine(coordinator);
    const [host, portText] = ready.listen.split(":");
    const addr = { host, port: Number(portText) };
    assert.strictEqual((await send(addr, { type: "ping" })).type, "pong");

    const grant = await send(addr, {
      type: "create_node_enrollment_grant",
      tenant: "tenant",
      project: "project",
      actor_user: "user",
      grant: "grant-local-services-node",
      now_epoch_seconds: 0,
      ttl_seconds: 900
    });
    assert.strictEqual(grant.type, "node_enrollment_grant_created");

    const { pid: nodePid, report } = await runNode(addr, grant.grant);
    assert(Number.isInteger(nodePid));
    assert.notStrictEqual(nodePid, coordinator.pid);
    assert.strictEqual(report.node_status, "completed");
    assert.strictEqual(report.status_code, 0);
    assert.strictEqual(report.large_bytes_uploaded, false);
    assert.strictEqual(report.registration_response.type, "node_enrollment_exchanged");
    assert.strictEqual(report.heartbeat_response.type, "node_heartbeat");
    assert.strictEqual(report.capability_response.type, "node_capabilities_recorded");
    assert.strictEqual(report.task_assignment_response.type, "task_placement");
    assert.strictEqual(report.debug_command_response.type, "debug_command");
    assert.strictEqual(report.log_event_response.type, "task_log_recorded");
    assert.strictEqual(report.vfs_metadata_response.type, "vfs_metadata_recorded");
    assert.strictEqual(report.session_requests, 10);
    assert.strictEqual(report.staged_artifact.path, "/vfs/artifacts/demo-test-output.txt");
    assert.strictEqual(report.coordinator_response.type, "task_recorded");

    const events = await send(addr, {
      type: "list_task_events",
      tenant: "tenant",
      project: "project",
      actor_user: "user",
      process: "vp-local"
    });
    assert.strictEqual(events.type, "task_events");
    assert.strictEqual(events.events.length, 1);
    assert.strictEqual(events.events[0].node, "node-a");
    assert.strictEqual(events.events[0].process, "vp-local");
    assert.strictEqual(events.events[0].task, "compile-linux");
    assert.strictEqual(events.events[0].status_code, 0);
    assert.strictEqual(events.events[0].artifact_path, "/vfs/artifacts/demo-test-output.txt");
  } finally {
    coordinator.kill("SIGTERM");
  }

  console.log("Local services smoke passed");
})().catch((error) => {
  console.error(error.stack || error.message);
  process.exit(1);
});