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from pymeasure.instruments import Instrument, SCPIUnknownMixin
from pymeasure.instruments.validators import strict_discrete_set, truncated_range

CHANNEL_NUMS = [1, 2, 3]


class BKPrecision9130B(SCPIUnknownMixin, Instrument):
    """ Represents the BK Precision 9130B DC Power Supply interface for interacting with
    the instrument. """

    current = Instrument.control(
        'MEASure:SCALar:CURRent:DC?',
        'SOURce:CURRent:LEVel:IMMediate:AMPLitude %g',
        """Control the current of the selected channel. (float)""",
        validator=truncated_range,
        values=[0, 3]
    )

    source_enabled = Instrument.control(
        'SOURce:CHANnel:OUTPut:STATe?',
        'SOURce:CHANnel:OUTPut:STATe %d',
        """Control whether the source is enabled. (bool) """,
        validator=strict_discrete_set,
        values={True: 1, False: 0},
        map_values=True
    )

    channel = Instrument.control(
        'INSTrument:SELect?',
        'INSTrument:SELect CH%d',
        f"""Control which channel is selected. Can only take
        values {CHANNEL_NUMS}. (int)""",
        validator=strict_discrete_set,
        values=CHANNEL_NUMS,
        get_process=lambda x: int(x[2])
    )

    def __init__(self, adapter, name="BK Precision 9130B Source", **kwargs):
        super().__init__(
            adapter, name, **kwargs
        )

    @property
    def voltage(self):
        """Control voltage of the selected channel. (float)"""
        return float(self.ask("MEASure:SCALar:VOLTage:DC?"))

    @voltage.setter
    def voltage(self, level):
        voltage_range = [0, 5] if self.channel == 3 else [0, 30]
        new_level = truncated_range(level, voltage_range)
        self.write("SOURce:VOLTage:LEVel:IMMediate:AMPLitude %g" % new_level)