#!/usr/bin/env npx tsx

/**
 * Regression: a single SIGINT sent to the supervised supervisor entrypoint must allow
 * graceful daemon lifecycle shutdown to complete (no early forced exit path).
 */

import assert from "node:assert";
import { spawn, type ChildProcess } from "node:child_process";
import { mkdtemp, rm } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { $ } from "zx";
import { getAvailablePort } from "./helpers/network.ts";

$.verbose = false;

const pollIntervalMs = 100;
const testEnv = {
  PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD: process.env.PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD ?? "0",
  PASEO_DICTATION_ENABLED: process.env.PASEO_DICTATION_ENABLED ?? "0",
  PASEO_VOICE_MODE_ENABLED: process.env.PASEO_VOICE_MODE_ENABLED ?? "0",
};

function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

function isProcessRunning(pid: number): boolean {
  if (!Number.isInteger(pid) || pid <= 0) {
    return false;
  }

  try {
    process.kill(pid, 0);
    return true;
  } catch {
    return false;
  }
}

function signalProcessGroup(pid: number, signal: NodeJS.Signals): boolean {
  if (!Number.isInteger(pid) || pid <= 0) {
    return false;
  }

  if (process.platform === "win32") {
    try {
      process.kill(pid, signal);
      return true;
    } catch {
      return false;
    }
  }

  try {
    process.kill(-pid, signal);
    return true;
  } catch {
    return false;
  }
}

interface DaemonStatus {
  localDaemon: string | null;
  pid: number | null;
}

async function readDaemonStatus(paseoHome: string): Promise<DaemonStatus> {
  const result =
    await $`PASEO_HOME=${paseoHome} PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD=${testEnv.PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD} PASEO_DICTATION_ENABLED=${testEnv.PASEO_DICTATION_ENABLED} PASEO_VOICE_MODE_ENABLED=${testEnv.PASEO_VOICE_MODE_ENABLED} npx paseo daemon status --home ${paseoHome} --json`.nothrow();
  if (result.exitCode !== 0) {
    return { localDaemon: null, pid: null };
  }

  try {
    const parsed = JSON.parse(result.stdout) as { localDaemon?: unknown; pid?: unknown };
    const localDaemon = typeof parsed.localDaemon === "string" ? parsed.localDaemon : null;
    const pid =
      typeof parsed.pid === "number" && Number.isInteger(parsed.pid) && parsed.pid > 0
        ? parsed.pid
        : null;
    return { localDaemon, pid };
  } catch {
    return { localDaemon: null, pid: null };
  }
}

async function waitFor(
  check: () => Promise<boolean> | boolean,
  timeoutMs: number,
  message: string,
): Promise<void> {
  const deadline = Date.now() + timeoutMs;

  async function poll(): Promise<void> {
    if (await check()) return;
    if (Date.now() >= deadline) throw new Error(message);
    await sleep(pollIntervalMs);
    return poll();
  }

  return poll();
}

interface ExitResult {
  code: number | null;
  signal: NodeJS.Signals | null;
}

function waitForProcessExit(processRef: ChildProcess, timeoutMs: number): Promise<ExitResult> {
  return new Promise((resolve, reject) => {
    const timeout = setTimeout(() => {
      reject(new Error("timed out waiting for process exit"));
    }, timeoutMs);

    processRef.once("exit", (code, signal) => {
      clearTimeout(timeout);
      resolve({ code, signal });
    });
  });
}

console.log("=== Daemon SIGINT (supervisor regression) ===\n");

const port = await getAvailablePort();
const paseoHome = await mkdtemp(join(tmpdir(), "paseo-sigint-supervisor-"));
const cliRoot = join(import.meta.dirname, "..");

let supervisorProcess: ChildProcess | null = null;
let recentSupervisorLogs = "";

try {
  console.log("Test 1: start supervisor-entrypoint in dev mode with isolated PASEO_HOME");

  supervisorProcess = spawn(
    process.execPath,
    ["--import", "tsx", "../server/scripts/supervisor-entrypoint.ts", "--dev"],
    {
      cwd: cliRoot,
      env: {
        ...process.env,
        ...testEnv,
        PASEO_HOME: paseoHome,
        PASEO_LISTEN: `127.0.0.1:${port}`,
        PASEO_RELAY_ENABLED: "false",
        CI: "true",
      },
      stdio: ["ignore", "pipe", "pipe"],
      detached: process.platform !== "win32",
    },
  );

  supervisorProcess.stdout?.on("data", (chunk) => {
    recentSupervisorLogs = (recentSupervisorLogs + chunk.toString()).slice(-8000);
  });
  supervisorProcess.stderr?.on("data", (chunk) => {
    recentSupervisorLogs = (recentSupervisorLogs + chunk.toString()).slice(-8000);
  });

  await waitFor(
    async () => {
      const status = await readDaemonStatus(paseoHome);
      return (
        status.localDaemon === "running" && status.pid !== null && isProcessRunning(status.pid)
      );
    },
    120000,
    "daemon did not become running in time",
  );

  console.log("✓ supervised daemon started\n");

  console.log("Test 2: single SIGINT should shutdown gracefully without forced exit");
  const exitPromise = waitForProcessExit(supervisorProcess, 30000);
  const signaledGroup = signalProcessGroup(supervisorProcess.pid ?? -1, "SIGINT");
  if (!signaledGroup) {
    supervisorProcess.kill("SIGINT");
  }

  const exit = await exitPromise;
  assert.strictEqual(
    exit.signal,
    null,
    `supervisor should exit cleanly, got signal=${exit.signal}`,
  );
  assert.strictEqual(exit.code, 0, `supervisor should exit with status 0, got code=${exit.code}`);

  await waitFor(
    async () => {
      const status = await readDaemonStatus(paseoHome);
      return status.localDaemon === "stopped";
    },
    15000,
    "daemon status did not transition to stopped after SIGINT",
  );

  assert(
    !recentSupervisorLogs.includes("Forcing exit..."),
    `worker entered forced-exit path during single SIGINT:\n${recentSupervisorLogs}`,
  );
  assert(
    !recentSupervisorLogs.includes("Forcing shutdown - HTTP server didn't close in time"),
    `worker hit shutdown timeout during single SIGINT:\n${recentSupervisorLogs}`,
  );

  console.log("✓ single SIGINT completed graceful shutdown without forced exit\n");
} finally {
  if (supervisorProcess?.pid && isProcessRunning(supervisorProcess.pid)) {
    const signaledGroup = signalProcessGroup(supervisorProcess.pid, "SIGTERM");
    if (!signaledGroup) {
      supervisorProcess.kill("SIGTERM");
    }
    await waitFor(
      () => !isProcessRunning(supervisorProcess!.pid ?? -1),
      5000,
      "supervisor cleanup timed out",
    ).catch(() => {
      const killedGroup = signalProcessGroup(supervisorProcess!.pid ?? -1, "SIGKILL");
      if (!killedGroup) {
        supervisorProcess?.kill("SIGKILL");
      }
    });
  }

  await $`PASEO_HOME=${paseoHome} PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD=${testEnv.PASEO_LOCAL_SPEECH_AUTO_DOWNLOAD} PASEO_DICTATION_ENABLED=${testEnv.PASEO_DICTATION_ENABLED} PASEO_VOICE_MODE_ENABLED=${testEnv.PASEO_VOICE_MODE_ENABLED} npx paseo daemon stop --home ${paseoHome} --force`.nothrow();
  await rm(paseoHome, { recursive: true, force: true });
}

if (recentSupervisorLogs.trim().length === 0) {
  console.log("(no supervisor logs captured)");
}

console.log("=== Supervisor SIGINT regression test passed ===");