import json
import sys

def instrument(pyvisa_instrument_address, device_handle):
        """
        Create an instance  

        Args:
            instrument_handle (Pyvisa Object): Input Pyvisa Object linked to target device.
            device_handle            (String): Input String indicating the make of the instrument.

        Returns:
            Object: Object of the device with bare essential interface commands.
        """
        # load the known devices json
        handle_exists_flag = 0
        module_obj = []

        f = open('supported_devices.json')
        allowed_handles = json.load(f)
        for handle in allowed_handles['supported_instruments']:
            # If handle found, create object
            if handle["make"] == device_handle:
                handle_exists_flag = 1
                # load the right instrument module and save as global import
                try:
                    sys.path.append(f"equipment/{handle["type"]}/py_generated/")
                    module_obj = __import__(f'{handle["make"]}')
                    module_obj = eval(f'module_obj.{handle["make"]}("{pyvisa_instrument_address}","{device_handle}")')
                except:
                    raise ValueError(f'[MeasKit] Invalid \"{device_handle}\" instrument class.')
                break
            # If similar handle, warn user
            elif handle["make"].lower() == device_handle.lower():
                tmp = handle["make"]
                print(f'[MeasKit] Similarely capitalized device handle found. Handle \"{device_handle}\" was queried for but \"{tmp}\" was found.')
        f.close()
        # If no exactly matching handles found error
        if not handle_exists_flag:
            raise ValueError(f'[MeasKit] Device handle \"{device_handle}\" not supported yet.')
        # waste some resources in the mem heap, investigate removing these
        return module_obj