#!/usr/bin/env python3
import datetime
import json
import signal
import time
from typing import Any, Dict, List

import psutil  # type: ignore[import]
import pynvml  # type: ignore[import]


def get_processes_running_python_tests() -> List[Any]:
    python_processes = []
    for process in psutil.process_iter():
        try:
            if "python" in process.name() and process.cmdline():
                python_processes.append(process)
        except (psutil.NoSuchProcess, psutil.AccessDenied):
            # access denied or the process died
            pass
    return python_processes


def get_per_process_cpu_info() -> List[Dict[str, Any]]:
    processes = get_processes_running_python_tests()
    per_process_info = []
    for p in processes:
        info = {
            "pid": p.pid,
            "cmd": " ".join(p.cmdline()),
            "cpu_percent": p.cpu_percent(),
            "rss_memory": p.memory_info().rss,
            "uss_memory": p.memory_full_info().uss,
        }
        if "pss" in p.memory_full_info():
            # only availiable in linux
            info["pss_memory"] = p.memory_full_info().pss
        per_process_info.append(info)
    return per_process_info


def get_per_process_gpu_info(handle: Any) -> List[Dict[str, Any]]:
    processes = pynvml.nvmlDeviceGetComputeRunningProcesses(handle)
    per_process_info = []
    for p in processes:
        info = {"pid": p.pid, "gpu_memory": p.usedGpuMemory}
        per_process_info.append(info)
    return per_process_info


if __name__ == "__main__":

    handle = None
    try:
        pynvml.nvmlInit()
        handle = pynvml.nvmlDeviceGetHandleByIndex(0)
    except pynvml.NVMLError:
        # no pynvml avaliable, probably because not cuda
        pass

    kill_now = False

    def exit_gracefully(*args: Any) -> None:
        global kill_now
        kill_now = True

    signal.signal(signal.SIGTERM, exit_gracefully)

    while not kill_now:
        try:
            stats = {
                "time": datetime.datetime.utcnow().isoformat("T") + "Z",
                "total_cpu_percent": psutil.cpu_percent(),
                "per_process_cpu_info": get_per_process_cpu_info(),
            }
            if handle is not None:
                stats["per_process_gpu_info"] = get_per_process_gpu_info(handle)
                # https://docs.nvidia.com/deploy/nvml-api/structnvmlUtilization__t.html
                gpu_utilization = pynvml.nvmlDeviceGetUtilizationRates(handle)
                stats["total_gpu_utilization"] = gpu_utilization.gpu
                stats["total_gpu_mem_utilization"] = gpu_utilization.memory
        except Exception as e:
            stats = {
                "time": datetime.datetime.utcnow().isoformat("T") + "Z",
                "error": str(e),
            }
        finally:
            print(json.dumps(stats))
            time.sleep(1)