"""
Provide basic class to build an operational scope

Created by Eugeniy E. Mikhailov 2021/11/29
"""

from qolab.hardware.scpi import SCPIinstr
from qolab.hardware.basic import BasicInstrument
from qolab.data.trace import TraceSetSameX


def calcSparsingAndNumPoints(self, availableNpnts=None, maxRequiredPoints=None):
    """Calculate sparcing and number of sparced points.
    
    Parameters
    ----------
    availableNpnts: int or None
        Number of available points. If set to None exit with error
    maxRequiredPoints: int or (None)
        number of requested points after decimation.
        If availableNpnts< maxRequiredPoints*2,
        decimation is impossible and we will get up to factor of 2 more
        than requested.

    Return
    ------
    (sparsing, Npnts, availableNpnts, maxRequiredPoints)
    """
    if availableNpnts is None:
        raise ValueError("Invalid availableNpnts value, must be int.")
    if maxRequiredPoints is None:
        maxRequiredPoints = self.maxRequiredPoints

    if availableNpnts <= maxRequiredPoints * 2:
        Npnts = availableNpnts
        sparsing = 1
    else:
        sparsing = int(np.floor(availableNpnts / maxRequiredPoints))
        Npnts = int(np.floor(availableNpnts / sparsing))
    return (sparsing, Npnts, availableNpnts, maxRequiredPoints)


class Scope(BasicInstrument):
    """Minimal class to implement a scope.

    Intended to be used as a parent for hardware aware scopes.

    Provide a minimal set of methods to be implemented by a scope.
    """

    def __init__(self, *args, **kwds):
        BasicInstrument.__init__(self, *args, **kwds)
        self.config["Device type"] = "Scope"
        self.config["Device model"] = "Generic Scope Without Hardware interface"
        self.config["FnamePrefix"] = "scope"
        self.numberOfChannels = 0
        # deviceProperties must have 'get' and preferably 'set' methods available,
        # i.e. 'SampleRate' needs getSampleRate() and love to have setSampleRate(value)
        # they will be used to obtain config and set device according to it
        self.deviceProperties.update(
            {"SampleRate", "TimePerDiv", "TrigDelay", "TriggerMode", "Roll", "Run"}
        )
        # same is applied to channelProperties
        # but we need setter/getter with channel number
        # i.e.  VoltsPerDiv must provide
        # getChanVoltsPerDiv(chNum) and setSampleRate(chNum, value)
        self.channelProperties = {
            "VoltsPerDiv",
            "VoltageOffset",
        }

    def getTrace(
        self, chNum, availableNpnts=None, maxRequiredPoints=None, decimate=True
    ):
        # Should work with minimal arguments list
        # but might be faster if parameters provided: less IO requests
        # old_trg_mode = self.getTriggerMode()
        # self.setTriggerMode('STOP'); # to get synchronous channels
        raise NotImplementedError("getTrace function is not implemented")
        # if old_trg_mode != "STOP":
        # short speed up here with this check
        # self.setTriggerMode(old_trg_mode)

    def getTriggerMode(self):
        # we expect NORM, AUTO, SINGLE, STOP
        raise NotImplementedError("getTriggerMode function is not implemented")

    def setTriggerMode(self, mode):
        # we expect NORM, AUTO, SINGLE, STOP
        raise NotImplementedError("setTriggerMode function is not implemented")

    def getAllTraces(self, availableNpnts=None, maxRequiredPoints=None, decimate=True):
        allTraces = TraceSetSameX("scope traces")
        allTraces.config["tags"]["DAQ"] = self.getConfig()
        old_trg_mode = self.getTriggerMode()
        self.setTriggerMode("STOP")
        # to get synchronous channels
        for chNum in range(1, self.numberOfChannels + 1):
            allTraces.addTrace(
                self.getTrace(
                    chNum,
                    availableNpnts=availableNpnts,
                    maxRequiredPoints=maxRequiredPoints,
                    decimate=decimate,
                )
            )
        # restore scope to the before acquisition mode
        if old_trg_mode != "STOP":
            # short speed up here with this check
            self.setTriggerMode(old_trg_mode)
        return allTraces

    def plot(self, **kwargs):
        allTraces = self.getAllTraces(**kwargs)
        allTraces.plot()

    def save(
        self,
        fname=None,
        item_format="e",
        availableNpnts=None,
        maxRequiredPoints=None,
        decimate=True,
        extension="dat",
    ):
        allTraces = self.getAllTraces(
            availableNpnts=availableNpnts,
            maxRequiredPoints=maxRequiredPoints,
            decimate=decimate,
        )
        allTraces.config["item_format"] = item_format
        if fname is None:
            fname = self.getNextDataFile(extension=extension)
        allTraces.save(fname)
        print(f"Data saved to: {fname}")
        return fname


class ScopeSCPI(SCPIinstr, Scope):
    """SCPI aware scope.

    Use as a parent for a hardware aware scope classes.

    Example
    -------

    >>> rm = pyvisa.ResourceManager()
    >>> ScopeSCPI(rm.open_resource('TCPIP::192.168.0.2::INSTR'))
    """

    def __init__(self, resource, *args, **kwds):
        SCPIinstr.__init__(self, resource)
        Scope.__init__(self, *args, **kwds)
        self.config["DeviceId"] = str.strip(self.idn)