#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.10"
# dependencies = ["websockets"]
# ///
"""tori-worker: connects to Tori server via WebSocket, reports hardware info, executes scripts."""

import argparse
import asyncio
import json
import os
import platform
import shutil
import subprocess
import tempfile

import websockets


def get_cpu_info() -> str:
    """Get CPU model name."""
    try:
        with open("/proc/cpuinfo") as f:
            for line in f:
                if line.startswith("model name"):
                    return line.split(":", 1)[1].strip()
    except Exception:
        pass
    return platform.processor() or platform.machine()


def get_memory_info() -> str:
    """Get total memory."""
    try:
        with open("/proc/meminfo") as f:
            for line in f:
                if line.startswith("MemTotal"):
                    kb = int(line.split()[1])
                    gb = kb / (1024 * 1024)
                    return f"{gb:.1f} GB"
    except Exception:
        pass
    return "unknown"


def get_gpu_info() -> str:
    """Get GPU info via nvidia-smi if available."""
    nvidia_smi = shutil.which("nvidia-smi")
    if nvidia_smi:
        try:
            out = subprocess.check_output(
                [nvidia_smi, "--query-gpu=name,memory.total", "--format=csv,noheader,nounits"],
                timeout=5, text=True
            ).strip()
            gpus = []
            for line in out.splitlines():
                parts = [p.strip() for p in line.split(",")]
                if len(parts) >= 2:
                    gpus.append(f"{parts[0]} ({parts[1]} MiB)")
                else:
                    gpus.append(parts[0])
            return "; ".join(gpus)
        except Exception:
            pass
    return "none"


def get_worker_info(name: str) -> dict:
    return {
        "name": name,
        "cpu": get_cpu_info(),
        "memory": get_memory_info(),
        "gpu": get_gpu_info(),
        "os": f"{platform.system()} {platform.release()}",
        "kernel": platform.release(),
    }


async def execute_script(script: str, timeout: int = 300) -> dict:
    """Execute a bash script and return result.

    If the script starts with a Python shebang or `# /// script` (uv inline metadata),
    it's written as .py and run via `uv run --script`. Otherwise it's run as bash.
    """
    is_python = script.lstrip().startswith(("#!/usr/bin/env python", "# /// script", "#!/usr/bin/python", "import ", "from "))
    suffix = ".py" if is_python else ".sh"

    with tempfile.NamedTemporaryFile(mode="w", suffix=suffix, delete=False) as f:
        f.write(script)
        f.flush()
        script_path = f.name

    try:
        if is_python:
            cmd = ["uv", "run", "--script", script_path]
        else:
            cmd = ["bash", script_path]

        proc = await asyncio.create_subprocess_exec(
            *cmd,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE,
        )
        try:
            stdout, stderr = await asyncio.wait_for(proc.communicate(), timeout=timeout)
        except asyncio.TimeoutError:
            proc.kill()
            await proc.wait()
            return {
                "job_id": "",
                "exit_code": -1,
                "stdout": "",
                "stderr": f"Script timed out after {timeout}s",
            }

        return {
            "job_id": "",
            "exit_code": proc.returncode,
            "stdout": stdout.decode(errors="replace"),
            "stderr": stderr.decode(errors="replace"),
        }
    finally:
        os.unlink(script_path)


async def run_worker(server_url: str, name: str):
    info = get_worker_info(name)
    print(f"Worker info: {json.dumps(info, indent=2)}")

    while True:
        try:
            print(f"Connecting to {server_url} ...")
            async with websockets.connect(server_url) as ws:
                # Register
                reg_msg = json.dumps({"type": "register", "info": info})
                await ws.send(reg_msg)

                ack = json.loads(await ws.recv())
                if ack.get("type") == "registered":
                    print(f"Registered as '{ack.get('name')}'")
                else:
                    print(f"Unexpected ack: {ack}")
                    await asyncio.sleep(5)
                    continue

                # Main loop: receive jobs, execute, send results
                async for message in ws:
                    msg = json.loads(message)
                    if msg.get("type") == "execute":
                        job_id = msg["job_id"]
                        script = msg["script"]
                        print(f"Executing job {job_id}: {script[:80]}...")

                        result = await execute_script(script)
                        result["job_id"] = job_id
                        result["type"] = "result"

                        await ws.send(json.dumps(result))
                        print(f"Job {job_id} done (exit={result['exit_code']})")

        except (websockets.exceptions.ConnectionClosed, ConnectionRefusedError, OSError) as e:
            print(f"Connection lost ({e}), reconnecting in 5s...")
            await asyncio.sleep(5)
        except Exception as e:
            print(f"Error: {e}")
            await asyncio.sleep(5)


def main():
    parser = argparse.ArgumentParser(description="Tori Worker")
    parser.add_argument("--server", default="wss://tori.euphon.cloud/ws/tori/workers",
                        help="WebSocket server URL")
    parser.add_argument("--name", default=platform.node(),
                        help="Worker name (default: hostname)")
    args = parser.parse_args()

    print(f"Starting tori-worker '{args.name}' -> {args.server}")
    asyncio.run(run_worker(args.server, args.name))


if __name__ == "__main__":
    main()