import { createServer } from "node:http";
import { randomUUID } from "node:crypto";

import {
  buildMetadataFromEnv,
  imageTagFromReference,
  normalizeIsoTimestamp
} from "../build-metadata.mjs";
import { DEV_ENDPOINT, ENVIRONMENT_DEV, ERROR_CODES } from "../protocol/index.mjs";
import {
  AUDIT_FIELD_NAMES,
  CLOUD_API_SERVICE_ID,
  createAuditRecord
} from "../audit/index.mjs";
import {
  SUPPORTED_RPC_METHODS,
  createErrorEnvelope,
  handleJsonRpcRequest
} from "./json-rpc.mjs";
import {
  createCodeAgentErrorPayload,
  describeCodeAgentAvailability,
  handleCodeAgentChat
} from "./code-agent-chat.mjs";
import { buildGateDiagnosticsRows } from "./gate-diagnostics.mjs";
import {
  applyRuntimeDbReadinessLayers,
  buildDbRuntimeReadiness
} from "./db-contract.mjs";
import { buildCloudApiReadiness } from "./health-contract.mjs";
import {
  M3_IO_CONTROL_ROUTE,
  M3_STATUS_ROUTE,
  describeM3IoControl,
  describeM3IoControlLive,
  describeM3StatusLive,
  handleM3IoControl
} from "./m3-io-control.mjs";
import { createConfiguredCloudRuntimeStore } from "../db/runtime-store.mjs";
import { createGatewayDemoRegistry } from "./gateway-demo-registry.mjs";

const DEFAULT_BODY_LIMIT_BYTES = 1024 * 1024;
const LIVE_BUILD_TIMEOUT_MS = 900;
const LIVE_BUILD_SERVICE_ENDPOINTS = Object.freeze([
  Object.freeze({ serviceId: "hwlab-cloud-api", serviceName: "hwlab-cloud-api", urlEnv: null, defaultUrl: "http://127.0.0.1:6667" }),
  Object.freeze({ serviceId: "hwlab-cloud-web", serviceName: "hwlab-cloud-web", urlEnv: "HWLAB_CLOUD_WEB_SERVICE_URL", defaultUrl: "http://hwlab-cloud-web.hwlab-dev.svc.cluster.local:8080" }),
  Object.freeze({ serviceId: "hwlab-agent-mgr", serviceName: "hwlab-agent-mgr", urlEnv: "HWLAB_AGENT_MGR_URL", defaultUrl: "http://hwlab-agent-mgr.hwlab-dev.svc.cluster.local:7410" }),
  Object.freeze({ serviceId: "hwlab-agent-worker", serviceName: "hwlab-agent-worker", urlEnv: "HWLAB_AGENT_WORKER_URL", defaultUrl: "http://hwlab-agent-worker.hwlab-dev.svc.cluster.local:7411", activation: "suspended-job-template" }),
  Object.freeze({ serviceId: "hwlab-gateway", serviceName: "hwlab-gateway", urlEnv: "HWLAB_GATEWAY_URL", defaultUrl: "http://hwlab-gateway.hwlab-dev.svc.cluster.local:7001", activation: "manual" }),
  Object.freeze({ serviceId: "hwlab-gateway-simu", serviceName: "hwlab-gateway-simu", urlEnv: "HWLAB_GATEWAY_SIMU_URL", defaultUrl: "http://hwlab-gateway-simu.hwlab-dev.svc.cluster.local:7101" }),
  Object.freeze({ serviceId: "hwlab-box-simu", serviceName: "hwlab-box-simu", urlEnv: "HWLAB_BOX_SIMU_URL", defaultUrl: "http://hwlab-box-simu.hwlab-dev.svc.cluster.local:7201" }),
  Object.freeze({ serviceId: "hwlab-patch-panel", serviceName: "hwlab-patch-panel", urlEnv: "HWLAB_PATCH_PANEL_URL", defaultUrl: "http://hwlab-patch-panel.hwlab-dev.svc.cluster.local:7301" }),
  Object.freeze({ serviceId: "hwlab-router", serviceName: "hwlab-router", urlEnv: "HWLAB_ROUTER_URL", defaultUrl: "http://hwlab-router.hwlab-dev.svc.cluster.local:7401" }),
  Object.freeze({ serviceId: "hwlab-tunnel-client", serviceName: "hwlab-tunnel-client", urlEnv: "HWLAB_TUNNEL_CLIENT_URL", defaultUrl: "http://hwlab-tunnel-client.hwlab-dev.svc.cluster.local:7402" }),
  Object.freeze({ serviceId: "hwlab-frpc", serviceName: "hwlab-frpc", externalImage: true, defaultImage: "127.0.0.1:5000/hwlab/frpc:v0.68.1" }),
  Object.freeze({ serviceId: "hwlab-edge-proxy", serviceName: "hwlab-edge-proxy", urlEnv: "HWLAB_EDGE_PROXY_URL", defaultUrl: "http://hwlab-edge-proxy.hwlab-dev.svc.cluster.local:6667", healthPath: "/health" }),
  Object.freeze({ serviceId: "hwlab-cli", serviceName: "hwlab-cli", urlEnv: "HWLAB_CLI_URL", defaultUrl: "http://hwlab-cli.hwlab-dev.svc.cluster.local:7501", activation: "suspended-job-template" }),
  Object.freeze({ serviceId: "hwlab-agent-skills", serviceName: "hwlab-agent-skills", urlEnv: "HWLAB_AGENT_SKILLS_URL", defaultUrl: "http://hwlab-agent-skills.hwlab-dev.svc.cluster.local:7430" })
]);

export function createCloudApiServer(options = {}) {
  const env = options.env ?? process.env;
  const runtimeStore = options.runtimeStore || createConfiguredCloudRuntimeStore({ ...options, env });
  const gatewayRegistry = options.gatewayRegistry || createGatewayDemoRegistry({
    staleMs: parsePositiveInteger(env.HWLAB_GATEWAY_DEMO_STALE_MS, 30000),
    dispatchTimeoutMs: parsePositiveInteger(env.HWLAB_GATEWAY_DISPATCH_TIMEOUT_MS, 30000)
  });
  return createServer(async (request, response) => {
    try {
      await routeRequest(request, response, { ...options, env, runtimeStore, gatewayRegistry });
    } catch (error) {
      sendJson(response, 500, {
        error: {
          code: "internal_error",
          message: "hwlab-cloud-api request handling failed",
          reason: error.message
        }
      });
    }
  });
}

export async function buildHealthPayload(options = {}) {
  const serviceId = CLOUD_API_SERVICE_ID;
  const env = options.env ?? process.env;
  const metadata = buildMetadataFromEnv(env, {
    serviceId,
    fallbackImageRepository: "ghcr.io/pikastech/hwlab-cloud-api"
  });
  const dbProbe = await buildDbRuntimeReadiness(env, options.dbProbe);
  const codeAgent = describeCodeAgentAvailability(env, options);
  const runtime = await runtimeReadiness(options.runtimeStore ?? createConfiguredCloudRuntimeStore({ ...options, env }));
  const db = applyRuntimeDbReadinessLayers(dbProbe, runtime);
  const readiness = buildCloudApiReadiness({ db, codeAgent, runtime });

  return {
    serviceId,
    environment: ENVIRONMENT_DEV,
    status: readiness.status,
    ready: readiness.ready,
    revision: metadata.revision,
    readiness,
    blockers: readiness.blockers,
    blockerCodes: readiness.blockerCodes,
    service: {
      id: serviceId,
      role: "cloud-api",
      healthPath: "/health",
      livePath: "/health/live"
    },
    commit: metadata.commit,
    image: metadata.image,
    build: metadata.build,
    endpoint: env.HWLAB_PUBLIC_ENDPOINT || DEV_ENDPOINT,
    observedAt: new Date().toISOString(),
    db,
    codeAgent,
    runtime
  };
}

async function routeRequest(request, response, options) {
  const url = new URL(request.url || "/", "http://hwlab-cloud-api.local");

  if (request.method === "GET" && (url.pathname === "/health" || url.pathname === "/health/live")) {
    sendJson(response, 200, await buildHealthPayload(options));
    return;
  }

  if (request.method === "GET" && url.pathname === "/live") {
    sendJson(response, 200, {
      serviceId: CLOUD_API_SERVICE_ID,
      status: "live"
    });
    return;
  }

  if (request.method === "POST" && (url.pathname === "/rpc" || url.pathname === "/json-rpc")) {
    await handleRpcHttpRequest(request, response, options);
    return;
  }

  if (url.pathname === "/v1" || url.pathname.startsWith("/v1/")) {
    await handleRestAdapter(request, response, url, options);
    return;
  }

  sendRestError(request, response, 404, "not_found", "Route is not part of the L1 cloud-api runtime", {
    operation: `${request.method || "GET"} ${url.pathname}`,
    target: {
      type: "route",
      id: url.pathname
    }
  });
}

async function handleRpcHttpRequest(request, response, options) {
  const body = await readBody(request, options.bodyLimitBytes);
  let envelope;

  try {
    envelope = body ? JSON.parse(body) : {};
  } catch (error) {
    sendJson(
      response,
      400,
      createErrorEnvelope({
        id: "req_unassigned",
        code: ERROR_CODES.parseError,
        message: "Invalid JSON body",
        data: {
          reason: error.message
        },
        context: {
          operation: "json_rpc.parse",
          target: {
            type: "http_route",
            id: request.url || "/rpc"
          },
          result: "rejected"
        }
      })
    );
    return;
  }

  const rpcResponse = await handleJsonRpcRequest(envelope, {
    adapter: "json-rpc",
    runtimeStore: options.runtimeStore,
    env: options.env,
    dbProbe: options.dbProbe,
    m3IoRequestJson: options.m3IoRequestJson,
    gatewayRegistry: options.gatewayRegistry
  });
  sendJson(response, statusForRpcResponse(rpcResponse), rpcResponse);
}

async function handleRestAdapter(request, response, url, options) {
  if (request.method === "GET" && url.pathname === "/v1") {
    const dbProbe = await buildDbRuntimeReadiness(options.env ?? process.env, options.dbProbe);
    const codeAgent = describeCodeAgentAvailability(options.env ?? process.env, options);
    const runtime = await runtimeReadiness(options.runtimeStore);
    const db = applyRuntimeDbReadinessLayers(dbProbe, runtime);
    const readiness = buildCloudApiReadiness({ db, codeAgent, runtime });
    sendJson(response, 200, {
      serviceId: CLOUD_API_SERVICE_ID,
      adapter: "rest",
      status: readiness.status,
      ready: readiness.ready,
      rpcBridge: "POST /v1/rpc/{method}",
      codeAgent,
      methods: SUPPORTED_RPC_METHODS,
      auditFields: AUDIT_FIELD_NAMES,
      db,
      runtime,
      readiness,
      blockers: readiness.blockers,
      blockerCodes: readiness.blockerCodes,
      m3IoControl: describeM3IoControl(options)
    });
    return;
  }

  if (request.method === "GET" && url.pathname === M3_IO_CONTROL_ROUTE) {
    sendJson(response, 200, await describeM3IoControlLive(options));
    return;
  }

  if (request.method === "GET" && url.pathname === M3_STATUS_ROUTE) {
    sendJson(response, 200, await describeM3StatusLive(options));
    return;
  }

  if (request.method === "GET" && url.pathname === "/v1/diagnostics/gate") {
    sendJson(response, 200, await buildGateDiagnosticsRows(options));
    return;
  }

  if (request.method === "GET" && url.pathname === "/v1/live-builds") {
    sendJson(response, 200, await buildLiveBuildsPayload(options));
    return;
  }

  if (request.method === "GET" && url.pathname === "/v1/gateway/sessions") {
    sendJson(response, 200, options.gatewayRegistry.describe());
    return;
  }

  if (request.method === "POST" && url.pathname === "/v1/gateway/poll") {
    await handleGatewayPollHttp(request, response, options);
    return;
  }

  if (request.method === "POST" && url.pathname === "/v1/gateway/result") {
    await handleGatewayResultHttp(request, response, options);
    return;
  }

  if (request.method === "POST" && url.pathname === M3_IO_CONTROL_ROUTE) {
    await handleM3IoControlHttp(request, response, options);
    return;
  }

  if (request.method === "POST" && url.pathname === "/v1/agent/chat") {
    await handleCodeAgentChatHttp(request, response, options);
    return;
  }

  if (request.method !== "POST" || !url.pathname.startsWith("/v1/rpc/")) {
    sendRestError(request, response, 404, "not_found", "REST route is not implemented in the L1 cloud-api runtime", {
      operation: `${request.method || "GET"} ${url.pathname}`,
      target: {
        type: "route",
        id: url.pathname
      }
    });
    return;
  }

  const method = decodeURIComponent(url.pathname.slice("/v1/rpc/".length));
  const body = await readBody(request, options.bodyLimitBytes);
  let params = {};

  try {
    params = body ? JSON.parse(body) : {};
  } catch (error) {
    sendRestError(request, response, 400, "parse_error", "Invalid JSON body", {
      operation: method,
      target: {
        type: "rpc_method",
        id: method
      },
      result: "rejected",
      reason: error.message
    });
    return;
  }

  if (!params || typeof params !== "object" || Array.isArray(params)) {
    sendRestError(request, response, 400, "invalid_params", "REST RPC bridge body must be a JSON object", {
      operation: method,
      target: {
        type: "rpc_method",
        id: method
      },
      result: "rejected"
    });
    return;
  }

  const rpcResponse = await handleJsonRpcRequest(
    {
      jsonrpc: "2.0",
      id: getHeader(request, "x-request-id") || `req_${randomUUID()}`,
      method,
      params,
      meta: {
        traceId: getHeader(request, "x-trace-id") || `trc_${randomUUID()}`,
        actorId: getHeader(request, "x-actor-id"),
        serviceId: getHeader(request, "x-source-service-id") || CLOUD_API_SERVICE_ID,
        environment: ENVIRONMENT_DEV
      }
    },
    {
      adapter: "rest",
      runtimeStore: options.runtimeStore,
      env: options.env,
      dbProbe: options.dbProbe,
      m3IoRequestJson: options.m3IoRequestJson,
      gatewayRegistry: options.gatewayRegistry
    }
  );

  sendJson(response, statusForRpcResponse(rpcResponse), rpcResponse);
}

async function buildLiveBuildsPayload(options = {}) {
  const env = options.env ?? process.env;
  const services = await Promise.all(
    LIVE_BUILD_SERVICE_ENDPOINTS.map((service) => observeLiveBuildService(service, { ...options, env }))
  );
  const hwlabServices = services.filter((service) => service.kind === "hwlab");
  const latest = [...hwlabServices]
    .filter((service) => service.build.createdAt)
    .sort((left, right) => Date.parse(right.build.createdAt) - Date.parse(left.build.createdAt))[0] ?? null;

  return {
    serviceId: CLOUD_API_SERVICE_ID,
    environment: ENVIRONMENT_DEV,
    status: "ok",
    contractVersion: "live-builds-v1",
    observedAt: new Date().toISOString(),
    source: {
      kind: "live-health",
      route: "/v1/live-builds",
      healthPath: "/health/live",
      note: "Each row is read from the current live service health payload or marked unavailable/external; observedAt is not used as build time."
    },
    latest,
    counts: {
      total: services.length,
      hwlab: hwlabServices.length,
      withBuildTime: hwlabServices.filter((service) => Boolean(service.build.createdAt)).length,
      unavailable: hwlabServices.filter((service) => service.build.createdAt === null).length,
      external: services.filter((service) => service.kind === "external").length
    },
    services
  };
}

async function observeLiveBuildService(service, options) {
  if (service.externalImage) {
    return externalLiveBuildRecord(service, {
      healthUrl: null,
      httpStatus: null,
      imageReference: service.defaultImage ?? "unknown",
      reason: "外部镜像或非 HWLAB 构建产物"
    });
  }

  if (service.serviceId === CLOUD_API_SERVICE_ID) {
    const health = await buildHealthPayload(options);
    return liveBuildRecordFromHealth(service, {
      ok: true,
      status: 200,
      url: "/health/live",
      payload: health
    });
  }

  const baseUrl = String(options.env?.[service.urlEnv] || service.defaultUrl || "").replace(/\/+$/u, "");
  if (!baseUrl) {
    return unavailableLiveBuildRecord(service, {
      reasonCode: "service_url_unavailable",
      reason: `${service.serviceId} 没有配置 live health URL`
    });
  }

  const healthPath = service.healthPath ?? "/health/live";
  return liveBuildRecordFromHealth(
    service,
    await fetchServiceHealth(`${baseUrl}${healthPath}`, options.fetchImpl ?? fetch)
  );
}

async function fetchServiceHealth(url, fetchImpl) {
  const controller = new AbortController();
  const timeout = setTimeout(() => controller.abort(), LIVE_BUILD_TIMEOUT_MS);
  try {
    const response = await fetchImpl(url, {
      headers: { Accept: "application/json" },
      signal: controller.signal
    });
    const text = await response.text();
    let payload = null;
    try {
      payload = text ? JSON.parse(text) : null;
    } catch {
      return {
        ok: false,
        status: response.status,
        url,
        reasonCode: "invalid_json",
        reason: `${url} returned non-JSON health payload`
      };
    }
    return {
      ok: response.ok,
      status: response.status,
      url,
      payload,
      reasonCode: response.ok ? null : "http_error",
      reason: response.ok ? null : `${url} returned HTTP ${response.status}`
    };
  } catch (error) {
    const timedOut = error?.name === "AbortError";
    return {
      ok: false,
      status: null,
      url,
      reasonCode: timedOut ? "timeout" : "request_failed",
      reason: timedOut ? `${url} timed out after ${LIVE_BUILD_TIMEOUT_MS}ms` : error.message
    };
  } finally {
    clearTimeout(timeout);
  }
}

function liveBuildRecordFromHealth(service, result) {
  if (!result.ok) {
    return unavailableLiveBuildRecord(service, {
      healthUrl: result.url,
      httpStatus: result.status,
      reasonCode: result.reasonCode ?? "health_unavailable",
      reason: healthUnavailableReason(service, result.reason ?? `${service.serviceId} health unavailable`)
    });
  }

  const payload = result.payload ?? {};
  const payloadServiceId = payload.serviceId ?? service.serviceId;
  if (!String(payloadServiceId).startsWith("hwlab-")) {
    return externalLiveBuildRecord(service, {
      healthUrl: result.url,
      httpStatus: result.status,
      imageReference: payload.image?.reference ?? payload.image ?? "unknown",
      imageTag: payload.image?.tag ?? null,
      imageDigest: payload.image?.digest ?? "unknown",
      commitId: payload.commit?.id ?? payload.revision ?? payload.version ?? "unknown",
      commitSource: payload.commit?.source ?? "external-health",
      revision: payload.revision ?? payload.commit?.id ?? payload.version ?? "unknown",
      reason: "外部镜像或非 HWLAB 构建产物"
    });
  }

  const imageReference = payload.image?.reference ?? payload.image ?? "unknown";
  const commitId = payload.commit?.id ?? payload.revision ?? "unknown";
  const createdAt = normalizeHealthBuildTime(payload);
  return {
    serviceId: service.serviceId,
    name: service.serviceName,
    kind: "hwlab",
    status: createdAt ? "ok" : "build_time_unavailable",
    healthUrl: result.url,
    httpStatus: result.status,
    build: {
      createdAt,
      source: payload.build?.source ?? payload.commit?.source ?? "health-payload",
      metadataSource: payload.build?.metadataSource ?? (createdAt ? "health:build.createdAt" : "unavailable"),
      unavailableReason: createdAt ? null : "构建时间不可用：health payload 缺少 build.createdAt / image.createdAt / buildCreatedAt"
    },
    image: {
      reference: imageReference,
      tag: payload.image?.tag ?? imageTagFromReference(imageReference) ?? "unknown",
      digest: payload.image?.digest ?? "unknown"
    },
    commit: {
      id: commitId,
      source: payload.commit?.source ?? "health-payload"
    },
    revision: payload.revision ?? commitId
  };
}

function unavailableLiveBuildRecord(service, { healthUrl = null, httpStatus = null, reasonCode, reason }) {
  return {
    serviceId: service.serviceId,
    name: service.serviceName,
    kind: "hwlab",
    status: "unavailable",
    healthUrl,
    httpStatus,
    build: {
      createdAt: null,
      metadataSource: "unavailable",
      unavailableReason: `构建时间不可用：${reason}`
    },
    image: {
      reference: "unknown",
      tag: "unknown",
      digest: "unknown"
    },
    commit: {
      id: "unknown",
      source: "unavailable"
    },
    revision: "unknown",
    error: {
      code: reasonCode,
      message: reason
    }
  };
}

function externalLiveBuildRecord(service, {
  healthUrl = null,
  httpStatus = null,
  imageReference = "unknown",
  imageTag = null,
  imageDigest = "unknown",
  commitId = "unknown",
  commitSource = "external-image",
  revision = commitId,
  reason
}) {
  return {
    serviceId: service.serviceId,
    name: service.serviceName,
    kind: "external",
    status: "external",
    healthUrl,
    httpStatus,
    build: {
      createdAt: null,
      metadataSource: "external-image",
      unavailableReason: reason
    },
    image: {
      reference: imageReference,
      tag: imageTag ?? imageTagFromReference(imageReference) ?? "unknown",
      digest: imageDigest
    },
    commit: {
      id: commitId,
      source: commitSource
    },
    revision
  };
}

function healthUnavailableReason(service, reason) {
  if (service.activation === "suspended-job-template") {
    return `${service.serviceId} 是 suspended Job template，当前 live desired replicas=0，无可读取的常驻 /health/live`;
  }
  if (service.activation === "manual") {
    return `${service.serviceId} 是手动激活服务，当前 live health 不可用：${reason}`;
  }
  return reason;
}

function normalizeHealthBuildTime(payload) {
  return normalizeIsoTimestamp(
    payload?.build?.createdAt ??
    payload?.image?.createdAt ??
    payload?.buildCreatedAt ??
    payload?.metadata?.buildCreatedAt ??
    null
  );
}

async function handleGatewayPollHttp(request, response, options) {
  const body = await readBody(request, options.bodyLimitBytes);
  let params = {};

  try {
    params = body ? JSON.parse(body) : {};
  } catch (error) {
    sendJson(response, 400, {
      accepted: false,
      error: {
        code: "parse_error",
        message: "Invalid JSON body",
        reason: error.message
      }
    });
    return;
  }

  if (!params || typeof params !== "object" || Array.isArray(params)) {
    sendJson(response, 400, {
      accepted: false,
      error: {
        code: "invalid_params",
        message: "gateway poll body must be a JSON object"
      }
    });
    return;
  }

  const session = options.gatewayRegistry.updateSession(params);
  await persistGatewayDemoSession({
    runtimeStore: options.runtimeStore,
    session,
    request,
    env: options.env
  });
  const outbound = options.gatewayRegistry.nextRequest(session.gatewaySessionId);
  sendJson(response, 200, {
    accepted: true,
    serviceId: CLOUD_API_SERVICE_ID,
    mode: "gateway-outbound-poll-demo",
    gatewayId: session.gatewayId,
    gatewaySessionId: session.gatewaySessionId,
    queueDepth: session.queue.length,
    request: outbound,
    type: outbound ? "request" : "noop",
    observedAt: new Date().toISOString()
  });
}

async function handleGatewayResultHttp(request, response, options) {
  const body = await readBody(request, options.bodyLimitBytes);
  let params = {};

  try {
    params = body ? JSON.parse(body) : {};
  } catch (error) {
    sendJson(response, 400, {
      accepted: false,
      error: {
        code: "parse_error",
        message: "Invalid JSON body",
        reason: error.message
      }
    });
    return;
  }

  const result = options.gatewayRegistry.complete(params);
  sendJson(response, result.accepted ? 200 : 404, {
    ...result,
    serviceId: CLOUD_API_SERVICE_ID,
    mode: "gateway-outbound-poll-demo",
    observedAt: new Date().toISOString()
  });
}

async function persistGatewayDemoSession({ runtimeStore, session, request, env = process.env }) {
  if (!runtimeStore) return;
  const refreshMs = parsePositiveInteger(env.HWLAB_GATEWAY_REGISTRATION_REFRESH_MS, 60000);
  if (session.runtimeRegisteredEpochMs && Date.now() - session.runtimeRegisteredEpochMs < refreshMs) {
    return;
  }
  const meta = {
    traceId: getHeader(request, "x-trace-id") || `trc_gateway_poll_${randomUUID()}`,
    actorId: `svc_${session.serviceId}`,
    serviceId: CLOUD_API_SERVICE_ID,
    environment: ENVIRONMENT_DEV
  };

  try {
    await runtimeStore.registerGatewaySession?.({
      projectId: session.projectId,
      gatewaySessionId: session.gatewaySessionId,
      serviceId: "hwlab-gateway",
      gatewayId: session.gatewayId,
      endpoint: session.endpoint,
      status: "connected",
      labels: {
        demoOutboundPoll: "true",
        os: String(session.system?.platform ?? "unknown")
      }
    }, meta);
    await runtimeStore.registerBoxResource?.({
      projectId: session.projectId,
      gatewaySessionId: session.gatewaySessionId,
      resourceId: session.resourceId,
      boxId: session.boxId,
      resourceType: "simulator_endpoint",
      state: "available",
      metadata: {
        serviceId: "hwlab-gateway",
        demoShellHost: true
      }
    }, meta);
    if (session.capabilities.length > 0) {
      await runtimeStore.reportBoxCapabilities?.({
        capabilities: session.capabilities.map((capability) => ({
          ...capability,
          resourceId: capability.resourceId ?? session.resourceId,
          projectId: capability.projectId ?? session.projectId
        }))
      }, meta);
    }
    session.runtimeRegisteredAt = new Date().toISOString();
    session.runtimeRegisteredEpochMs = Date.now();
  } catch {
    // Demo polling must keep the gateway online even when durable runtime writes are not ready.
  }
}

async function handleCodeAgentChatHttp(request, response, options) {
  const body = await readBody(request, options.bodyLimitBytes);
  let params = {};

  try {
    params = body ? JSON.parse(body) : {};
  } catch (error) {
    sendJson(response, 400, {
      ...createCodeAgentErrorPayload({
        code: "parse_error",
        message: "Invalid JSON body",
        reason: error.message,
        traceId: getHeader(request, "x-trace-id") || "trc_unassigned",
        model: options.env?.HWLAB_CODE_AGENT_MODEL || options.env?.OPENAI_MODEL || process.env.HWLAB_CODE_AGENT_MODEL || process.env.OPENAI_MODEL || "unknown",
        layer: "api",
        retryable: true
      })
    });
    return;
  }

  if (!params || typeof params !== "object" || Array.isArray(params)) {
    sendJson(response, 400, {
      ...createCodeAgentErrorPayload({
        code: "invalid_params",
        message: "Code Agent chat body must be a JSON object",
        traceId: getHeader(request, "x-trace-id") || "trc_unassigned",
        model: options.env?.HWLAB_CODE_AGENT_MODEL || options.env?.OPENAI_MODEL || process.env.HWLAB_CODE_AGENT_MODEL || process.env.OPENAI_MODEL || "unknown",
        layer: "api",
        retryable: true
      })
    });
    return;
  }

  const payload = await handleCodeAgentChat(
    {
      ...params,
      traceId: getHeader(request, "x-trace-id") || params.traceId
    },
    {
      callProvider: options.callCodeAgentProvider,
      timeoutMs: options.codeAgentTimeoutMs,
      env: options.env,
      workspace: options.workspace,
      skillsDirs: options.skillsDirs,
      skillsDirsExact: options.skillsDirsExact,
      skillsDiscoveryDelayMs: options.skillsDiscoveryDelayMs,
      sessionRegistry: options.sessionRegistry,
      m3IoSkillRequestJson: options.m3IoSkillRequestJson,
      codexStdioManager: options.codexStdioManager
    }
  );

  sendJson(response, payload.status === "failed" && payload.error?.code === "invalid_params" ? 400 : 200, payload);
}

async function handleM3IoControlHttp(request, response, options) {
  const body = await readBody(request, options.bodyLimitBytes);
  let params = {};

  try {
    params = body ? JSON.parse(body) : {};
  } catch (error) {
    sendJson(response, 400, {
      serviceId: CLOUD_API_SERVICE_ID,
      contractVersion: "m3-io-control-v1",
      route: M3_IO_CONTROL_ROUTE,
      method: "POST",
      status: "blocked",
      accepted: false,
      traceId: getHeader(request, "x-trace-id") || "trc_unassigned",
      operationId: null,
      auditId: null,
      evidenceId: null,
      audit: {
        auditId: null,
        status: "not_written"
      },
      evidence: {
        evidenceId: null,
        status: "blocked",
        sourceKind: "BLOCKED"
      },
      readback: null,
      error: {
        code: "parse_error",
        message: "Invalid JSON body",
        reason: error.message
      }
    });
    return;
  }

  if (!params || typeof params !== "object" || Array.isArray(params)) {
    sendJson(response, 400, {
      serviceId: CLOUD_API_SERVICE_ID,
      contractVersion: "m3-io-control-v1",
      route: M3_IO_CONTROL_ROUTE,
      method: "POST",
      status: "blocked",
      accepted: false,
      traceId: getHeader(request, "x-trace-id") || "trc_unassigned",
      operationId: null,
      auditId: null,
      evidenceId: null,
      audit: {
        auditId: null,
        status: "not_written"
      },
      evidence: {
        evidenceId: null,
        status: "blocked",
        sourceKind: "BLOCKED"
      },
      readback: null,
      error: {
        code: "invalid_params",
        message: "M3 IO control body must be a JSON object"
      }
    });
    return;
  }

  try {
    const payload = await handleM3IoControl(
      {
        ...params,
        traceId: getHeader(request, "x-trace-id") || params.traceId,
        requestId: getHeader(request, "x-request-id") || params.requestId,
        actorId: getHeader(request, "x-actor-id") || params.actorId
      },
      {
        runtimeStore: options.runtimeStore,
        env: options.env,
        requestJson: options.m3IoRequestJson,
        traceId: getHeader(request, "x-trace-id"),
        requestId: getHeader(request, "x-request-id"),
        actorId: getHeader(request, "x-actor-id")
      }
    );
    sendJson(response, payload.httpStatus ?? 200, payload);
  } catch (error) {
    const protocolCode = Number.isInteger(error?.code) ? error.code : ERROR_CODES.internalError;
    sendJson(response, protocolCode === ERROR_CODES.invalidParams ? 400 : 200, {
      serviceId: CLOUD_API_SERVICE_ID,
      contractVersion: "m3-io-control-v1",
      route: M3_IO_CONTROL_ROUTE,
      method: "POST",
      status: "blocked",
      accepted: false,
      traceId: getHeader(request, "x-trace-id") || params.traceId || "trc_unassigned",
      operationId: null,
      auditId: null,
      evidenceId: null,
      audit: {
        auditId: null,
        status: "not_written"
      },
      evidence: {
        evidenceId: null,
        status: "blocked",
        sourceKind: "BLOCKED"
      },
      readback: null,
      error: {
        code: protocolCode,
        message: error.message,
        data: error.data ?? {}
      }
    });
  }
}

function sendRestError(request, response, statusCode, code, message, context = {}) {
  const requestId = getHeader(request, "x-request-id") || "req_unassigned";
  sendJson(response, statusCode, {
    error: {
      code,
      message,
      reason: context.reason,
      audit: createAuditRecord({
        requestId,
        actor: {
          type: "user",
          id: getHeader(request, "x-actor-id") || `system_${CLOUD_API_SERVICE_ID}`
        },
        source: {
          serviceId: CLOUD_API_SERVICE_ID,
          environment: ENVIRONMENT_DEV,
          traceId: getHeader(request, "x-trace-id"),
          adapter: "rest"
        },
        operation: context.operation || `${request.method || "GET"} ${request.url || "/"}`,
        target: context.target || {
          type: "route",
          id: request.url || "/"
        },
        result: context.result || "failed"
      })
    }
  });
}

function statusForRpcResponse(rpcResponse) {
  if (!rpcResponse.error) {
    return 200;
  }

  if (rpcResponse.error.code === ERROR_CODES.invalidRequest || rpcResponse.error.code === ERROR_CODES.parseError) {
    return 400;
  }

  if (rpcResponse.error.code === ERROR_CODES.methodNotFound) {
    return 404;
  }

  return 200;
}

function readBody(request, limitBytes = DEFAULT_BODY_LIMIT_BYTES) {
  const limit = Number.isInteger(limitBytes) && limitBytes > 0 ? limitBytes : DEFAULT_BODY_LIMIT_BYTES;

  return new Promise((resolve, reject) => {
    let body = "";
    request.setEncoding("utf8");

    request.on("data", (chunk) => {
      body += chunk;
      if (Buffer.byteLength(body, "utf8") > limit) {
        request.destroy(new Error(`request body exceeds ${limit} bytes`));
      }
    });

    request.on("end", () => resolve(body));
    request.on("error", reject);
  });
}

function sendJson(response, statusCode, body) {
  response.writeHead(statusCode, {
    "content-type": "application/json; charset=utf-8",
    "cache-control": "no-store"
  });
  response.end(`${JSON.stringify(body)}\n`);
}

function getHeader(request, name) {
  const value = request.headers[name.toLowerCase()];
  if (Array.isArray(value)) {
    return value[0];
  }
  return value;
}

function parsePositiveInteger(value, fallback) {
  const parsed = Number.parseInt(value ?? "", 10);
  return Number.isInteger(parsed) && parsed > 0 ? parsed : fallback;
}

async function runtimeReadiness(runtimeStore) {
  if (typeof runtimeStore?.readiness === "function") {
    return runtimeStore.readiness();
  }
  return runtimeStore.summary();
}