import assert from "node:assert/strict";
import { mkdtemp, rm, writeFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { test } from "bun:test";

import { createCloudApiBunServer } from "./bun-server.ts";
import { createCloudApiServer } from "./server.ts";
import { connectHwpodNodeWs, createHwpodNodeServer } from "../../tools/src/hwpod-node-lib.ts";

test("cloud-api exposes hwpod-node-ops contract on /v1", async () => {
  const server = createCloudApiServer();
  await listen(server);
  try {
    const response = await fetch(`${serverUrl(server)}/v1`);
    const payload = await response.json();
    assert.equal(response.status, 200);
    assert.equal(payload.hwpod.contractVersion, "hwpod-node-ops-v1");
    assert.equal(payload.hwpod.apiRole, "node-ops-forwarder");
    assert.ok(payload.hwpod.supportedOps.includes("workspace.ls"));
  } finally {
    await close(server);
  }
});

test("cloud-api forwards valid hwpod-node-ops plans to injected node handler", async () => {
  const seen: any[] = [];
  const server = createCloudApiServer({
    hwpodNodeOpsHandler: async (plan: any, context: any) => {
      seen.push({ plan, context });
      return {
        ok: true,
        status: "completed",
        results: plan.ops.map((op: any) => ({ opId: op.opId, op: op.op, ok: true, status: "completed", output: { sample: true } }))
      };
    }
  });
  await listen(server);
  try {
    const response = await fetch(`${serverUrl(server)}/v1/hwpod-node-ops`, {
      method: "POST",
      headers: { "content-type": "application/json", "x-trace-id": "trc_hwpod_test" },
      body: JSON.stringify(samplePlan())
    });
    const payload = await response.json();
    assert.equal(response.status, 200);
    assert.equal(payload.ok, true);
    assert.equal(payload.status, "completed");
    assert.equal(payload.contractVersion, "hwpod-node-ops-v1");
    assert.equal(payload.results[0].op, "workspace.ls");
    assert.equal(seen.length, 1);
    assert.equal(seen[0].plan.nodeId, "pc-host-1");
    assert.equal(seen[0].context.requestMeta.traceId, "trc_hwpod_test");
  } finally {
    await close(server);
  }
});

test("cloud-api returns blocked payload when hwpod-node is not wired yet", async () => {
  const server = createCloudApiServer();
  await listen(server);
  try {
    const response = await fetch(`${serverUrl(server)}/v1/hwpod-node-ops`, {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify(samplePlan())
    });
    const payload = await response.json();
    assert.equal(response.status, 200);
    assert.equal(payload.ok, false);
    assert.equal(payload.status, "blocked");
    assert.equal(payload.blocker.code, "hwpod_node_unavailable");
    assert.equal(payload.results[0].blocker.layer, "hwpod-node");
  } finally {
    await close(server);
  }
});

test("cloud-api forwards hwpod-node-ops to configured thin hwpod-node URL", async () => {
  const node = createHwpodNodeServer();
  await listen(node);
  const server = createCloudApiServer({
    env: {
      PATH: process.env.PATH,
      HWLAB_HWPOD_NODE_OPS_URL: `${serverUrl(node)}/v1/hwpod-node-ops`
    }
  });
  await listen(server);
  try {
    const plan = samplePlan();
    plan.ops[0].args.workspacePath = process.cwd();
    const response = await fetch(`${serverUrl(server)}/v1/hwpod-node-ops`, {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify(plan)
    });
    const payload = await response.json();
    assert.equal(response.status, 200);
    assert.equal(payload.ok, true);
    assert.equal(payload.status, "completed");
    assert.equal(payload.results[0].op, "workspace.ls");
    assert.equal(payload.results[0].output.entries.some((entry: any) => entry.name === "package.json"), true);
  } finally {
    await close(server);
    await close(node);
  }
});

test("cloud-api dispatches hwpod-node-ops to outbound WebSocket hwpod-node by nodeId", async () => {
  const root = await mkdtemp(path.join(os.tmpdir(), "hwlab-hwpod-node-ws-"));
  const runtime = await createCloudApiBunServer({ host: "127.0.0.1", port: 0, env: { PATH: process.env.PATH } });
  const connector = connectHwpodNodeWs({ cloudUrl: runtime.url, nodeId: "pc-host-1", reconnect: false, heartbeatIntervalMs: 1000 });
  try {
    await writeFile(path.join(root, "main.c"), "int main(void) { return 0; }\n", "utf8");
    await withTimeout(connector.ready, 3000, "hwpod-node WebSocket registration timed out");
    const plan = samplePlan();
    plan.ops[0].args.workspacePath = root;
    const response = await fetch(`${runtime.url}/v1/hwpod-node-ops`, {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify(plan)
    });
    const payload = await response.json();
    assert.equal(response.status, 200);
    assert.equal(payload.ok, true);
    assert.equal(payload.status, "completed");
    assert.equal(payload.nodeId, "pc-host-1");
    assert.equal(payload.results[0].op, "workspace.ls");
    assert.equal(payload.results[0].output.entries.some((entry: any) => entry.name === "main.c"), true);
  } finally {
    connector.close();
    runtime.stop();
    await rm(root, { recursive: true, force: true });
  }
});

test("cloud-api rejects unsupported hwpod-node ops before forwarding", async () => {
  const server = createCloudApiServer({
    hwpodNodeOpsHandler: async () => {
      throw new Error("must not be called");
    }
  });
  await listen(server);
  try {
    const plan = samplePlan();
    plan.ops[0].op = "debug.flash";
    const response = await fetch(`${serverUrl(server)}/v1/hwpod-node-ops`, {
      method: "POST",
      headers: { "content-type": "application/json" },
      body: JSON.stringify(plan)
    });
    const payload = await response.json();
    assert.equal(response.status, 400);
    assert.equal(payload.ok, false);
    assert.equal(payload.error.code, "unsupported_hwpod_node_op");
  } finally {
    await close(server);
  }
});

function samplePlan() {
  return {
    contractVersion: "hwpod-node-ops-v1",
    planId: "hwpod_plan_test",
    hwpodId: "hwpod-local",
    nodeId: "pc-host-1",
    intent: "workspace.ls",
    ops: [
      { opId: "op_01_workspace_ls", op: "workspace.ls", args: { workspacePath: "/workspace/fw", path: "." } }
    ]
  };
}

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

async function close(server: any) {
  await new Promise((resolve, reject) => server.close((error: Error | undefined) => (error ? reject(error) : resolve(undefined))));
}

function serverUrl(server: any) {
  return `http://127.0.0.1:${server.address().port}`;
}

async function withTimeout(promise: Promise<unknown>, timeoutMs: number, message: string) {
  let timer: ReturnType<typeof setTimeout> | null = null;
  try {
    return await Promise.race([
      promise,
      new Promise((_resolve, reject) => {
        timer = setTimeout(() => reject(new Error(message)), timeoutMs);
      })
    ]);
  } finally {
    if (timer !== null) clearTimeout(timer);
  }
}