import subprocess
import pynvml


cdef class HardwareService:
    """Handles hardware information retrieval and hash generation."""

    def __init__(self):
        try:
            res = subprocess.check_output("ver", shell=True).decode('utf-8')
            if "Microsoft Windows" in res:
                self.is_windows = True
            else:
                self.is_windows = False
        except Exception:
            print('Error during os type checking')
            self.is_windows = False

    @staticmethod
    cdef has_nvidia_gpu():
        try:
            pynvml.nvmlInit()
            device_count = pynvml.nvmlDeviceGetCount()

            if device_count > 0:
                print(f"Found NVIDIA GPU(s).")
                return True
            else:
                print("No NVIDIA GPUs found by NVML.")
                return False

        except pynvml.NVMLError as error:
            print(f"Failed to find NVIDIA GPU")
            return False
        finally:
            try:
                pynvml.nvmlShutdown()
            except:
                print('Failed to shutdown pynvml cause probably no NVidia GPU')
                pass

    cdef str get_hardware_info(self):
        if self.is_windows:
            os_command = (
                "powershell -Command \""
                "Get-CimInstance -ClassName Win32_Processor | Select-Object -ExpandProperty Name | Write-Output; "
                "Get-CimInstance -ClassName Win32_VideoController | Select-Object -ExpandProperty Name | Write-Output; "
                "Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object -ExpandProperty TotalVisibleMemorySize | Write-Output; "
                "(Get-Disk | Where-Object {$_.IsSystem -eq $true}).SerialNumber"
                "\""
            )
        else:
            os_command = (
                "/bin/bash -c \" lscpu | grep 'Model name:' | cut -d':' -f2 && "
                "lspci | grep VGA | cut -d':' -f3 && "
                "free -g | grep Mem: | awk '{print $2}' && \""
                "udevadm info --query=property --name=\"/dev/$(lsblk -no pkname \"$(findmnt -n -o SOURCE --target /)\")\" | grep -E 'ID_SERIAL=|ID_SERIAL_SHORT=' | cut -d'=' -f2- | head -n1 && "
            )
        # in case of subprocess error do:
        # cdef bytes os_command_bytes = os_command.encode('utf-8')
        # and use os_command_bytes

        result = subprocess.check_output(os_command, shell=True).decode('utf-8')
        lines = [line.strip() for line in result.splitlines() if line.strip()]

        cdef str cpu = lines[0].replace("Name=", "").replace("  ", " ")
        cdef str gpu = lines[1].replace("Name=", "").replace("  ", " ")
        # could be multiple gpus

        len_lines = len(lines)
        cdef str memory = lines[len_lines-2].replace("TotalVisibleMemorySize=", "").replace("  ", " ")
        cdef str drive_serial = lines[len_lines-1]

        cdef str res =  f'CPU: {cpu}. GPU: {gpu}. Memory: {memory}. DriveSerial: {drive_serial}'
        return res