#!/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;
      try {
        resolve(JSON.parse(buffer.slice(0, newline).trim()));
      } 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 runProducerNode(addr) {
  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-export-source",
        "--process",
        "vp-export",
        "--task",
        "compile-linux",
        "--project",
        project,
        "--artifact",
        "/vfs/artifacts/export-output.txt",
      ],
      { cwd: repo }
    );
    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(`producer node failed with code ${code}\n${stderr}`));
        return;
      }
      try {
        resolve(JSON.parse(stdout.trim().split("\n").at(-1)));
      } catch (error) {
        reject(new Error(`producer node output was not JSON: ${stdout}\n${error.stack || error.message}`));
      }
    });
  });
}

function nodeCapabilities() {
  return {
    os: "Linux",
    arch: "x86_64",
    capabilities: ["Command", "VfsArtifacts"],
    environment_backends: [],
    source_providers: ["filesystem"],
  };
}

async function reportNode(addr, node, { directConnectivity = true, online = true } = {}) {
  const response = await send(addr, {
    type: "report_node_capabilities",
    tenant: "tenant",
    project: "project",
    node,
    capabilities: nodeCapabilities(),
    cached_environment_digests: [],
    dependency_cache_digests: [],
    source_snapshots: [],
    artifact_locations: [],
    direct_connectivity: directConnectivity,
    online,
  });
  assert.strictEqual(response.type, "node_capabilities_recorded");
  assert.strictEqual(response.node, node);
}

(async () => {
  const coordinator = cp.spawn(
    "cargo",
    [
      "run",
      "-q",
      "-p",
      "disasmer-coordinator",
      "--bin",
      "disasmer-coordinator",
      "--",
      "--listen",
      "127.0.0.1:0",
    ],
    { cwd: repo }
  );

  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 produced = await runProducerNode(addr);
    assert.strictEqual(produced.node_status, "completed");
    assert.strictEqual(produced.coordinator_response.type, "task_recorded");
    assert.strictEqual(produced.staged_artifact.path, "/vfs/artifacts/export-output.txt");

    await reportNode(addr, "node-export-source");

    const attachedReceiver = await send(addr, {
      type: "attach_node",
      tenant: "tenant",
      project: "project",
      node: "node-export-receiver",
      public_key: "node-export-receiver-public-key",
    });
    assert.strictEqual(attachedReceiver.type, "node_attached");
    await reportNode(addr, "node-export-receiver");

    const exportPlan = await send(addr, {
      type: "export_artifact_to_node",
      tenant: "tenant",
      project: "project",
      actor_user: "user",
      artifact: "export-output.txt",
      receiver_node: "node-export-receiver",
      direct_connectivity: true,
      failure_reason: "",
    });
    assert.strictEqual(exportPlan.type, "artifact_export_plan");
    assert.strictEqual(exportPlan.source_node, "node-export-source");
    assert.strictEqual(exportPlan.receiver_node, "node-export-receiver");
    assert.strictEqual(exportPlan.plan.transport, "NativeQuic");
    assert.strictEqual(exportPlan.plan.scope.tenant, "tenant");
    assert.strictEqual(exportPlan.plan.scope.project, "project");
    assert.strictEqual(exportPlan.plan.scope.process, "vp-export");
    assert.deepStrictEqual(exportPlan.plan.scope.object, { Artifact: "export-output.txt" });
    assert.strictEqual(exportPlan.plan.source.node, "node-export-source");
    assert.strictEqual(exportPlan.plan.destination.node, "node-export-receiver");
    assert.strictEqual(exportPlan.plan.coordinator_assisted_rendezvous, true);
    assert.strictEqual(exportPlan.plan.coordinator_bulk_relay_allowed, false);
    assert.match(exportPlan.plan.authorization_digest, /^sha256:[0-9a-f]{64}$/);

    const crossTenant = await send(addr, {
      type: "export_artifact_to_node",
      tenant: "other",
      project: "project",
      actor_user: "user",
      artifact: "export-output.txt",
      receiver_node: "node-export-receiver",
      direct_connectivity: true,
      failure_reason: "",
    });
    assert.strictEqual(crossTenant.type, "error");
    assert.match(crossTenant.message, /tenant mismatch/);

    const failedDirect = await send(addr, {
      type: "export_artifact_to_node",
      tenant: "tenant",
      project: "project",
      actor_user: "user",
      artifact: "export-output.txt",
      receiver_node: "node-export-receiver",
      direct_connectivity: false,
      failure_reason: "nat traversal failed",
    });
    assert.strictEqual(failedDirect.type, "error");
    assert.match(failedDirect.message, /nat traversal failed/);
    assert.match(failedDirect.message, /coordinator bulk relay is disabled/);

    await reportNode(addr, "node-export-receiver", { online: false });
    const offlineReceiver = await send(addr, {
      type: "export_artifact_to_node",
      tenant: "tenant",
      project: "project",
      actor_user: "user",
      artifact: "export-output.txt",
      receiver_node: "node-export-receiver",
      direct_connectivity: true,
      failure_reason: "",
    });
    assert.strictEqual(offlineReceiver.type, "error");
    assert.match(offlineReceiver.message, /offline/);
  } finally {
    coordinator.kill("SIGTERM");
  }

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