# -*- coding: utf-8 -*-
# ********************************************************************
#
#  $Id: svn_id $
#
#  Implements yFindQuadratureDecoder(), the high-level API for QuadratureDecoder functions
#
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__docformat__ = 'restructuredtext en'
from yocto_api import *


#--- (YQuadratureDecoder class start)
#noinspection PyProtectedMember
class YQuadratureDecoder(YSensor):
    """
    The YQuadratureDecoder class allows you to read and configure Yoctopuce quadrature decoders.
    It inherits from YSensor class the core functions to read measurements,
    to register callback functions, and to access the autonomous datalogger.

    """
    #--- (end of YQuadratureDecoder class start)
    #--- (YQuadratureDecoder return codes)
    #--- (end of YQuadratureDecoder return codes)
    #--- (YQuadratureDecoder dlldef)
    #--- (end of YQuadratureDecoder dlldef)
    #--- (YQuadratureDecoder yapiwrapper)
    #--- (end of YQuadratureDecoder yapiwrapper)
    #--- (YQuadratureDecoder definitions)
    SPEED_INVALID = YAPI.INVALID_DOUBLE
    EDGESPERCYCLE_INVALID = YAPI.INVALID_UINT
    DECODING_OFF = 0
    DECODING_ON = 1
    DECODING_INVALID = -1
    #--- (end of YQuadratureDecoder definitions)

    def __init__(self, func):
        super(YQuadratureDecoder, self).__init__(func)
        self._className = 'QuadratureDecoder'
        #--- (YQuadratureDecoder attributes)
        self._callback = None
        self._speed = YQuadratureDecoder.SPEED_INVALID
        self._decoding = YQuadratureDecoder.DECODING_INVALID
        self._edgesPerCycle = YQuadratureDecoder.EDGESPERCYCLE_INVALID
        #--- (end of YQuadratureDecoder attributes)

    #--- (YQuadratureDecoder implementation)
    def _parseAttr(self, json_val):
        if json_val.has("speed"):
            self._speed = round(json_val.getDouble("speed") / 65.536) / 1000.0
        if json_val.has("decoding"):
            self._decoding = json_val.getInt("decoding") > 0
        if json_val.has("edgesPerCycle"):
            self._edgesPerCycle = json_val.getInt("edgesPerCycle")
        super(YQuadratureDecoder, self)._parseAttr(json_val)

    def set_currentValue(self, newval):
        """
        Changes the current expected position of the quadrature decoder.
        Invoking this function implicitly activates the quadrature decoder.

        @param newval : a floating point number corresponding to the current expected position of the quadrature decoder

        @return YAPI.SUCCESS if the call succeeds.

        On failure, throws an exception or returns a negative error code.
        """
        rest_val = str(int(round(newval * 65536.0, 1)))
        return self._setAttr("currentValue", rest_val)

    def get_speed(self):
        """
        Returns the cycle frequency, in Hz.

        @return a floating point number corresponding to the cycle frequency, in Hz

        On failure, throws an exception or returns YQuadratureDecoder.SPEED_INVALID.
        """
        # res
        if self._cacheExpiration <= YAPI.GetTickCount():
            if self.load(YAPI._yapiContext.GetCacheValidity()) != YAPI.SUCCESS:
                return YQuadratureDecoder.SPEED_INVALID
        res = self._speed
        return res

    def get_decoding(self):
        """
        Returns the current activation state of the quadrature decoder.

        @return either YQuadratureDecoder.DECODING_OFF or YQuadratureDecoder.DECODING_ON, according to the
        current activation state of the quadrature decoder

        On failure, throws an exception or returns YQuadratureDecoder.DECODING_INVALID.
        """
        # res
        if self._cacheExpiration <= YAPI.GetTickCount():
            if self.load(YAPI._yapiContext.GetCacheValidity()) != YAPI.SUCCESS:
                return YQuadratureDecoder.DECODING_INVALID
        res = self._decoding
        return res

    def set_decoding(self, newval):
        """
        Changes the activation state of the quadrature decoder.
        Remember to call the saveToFlash()
        method of the module if the modification must be kept.

        @param newval : either YQuadratureDecoder.DECODING_OFF or YQuadratureDecoder.DECODING_ON, according
        to the activation state of the quadrature decoder

        @return YAPI.SUCCESS if the call succeeds.

        On failure, throws an exception or returns a negative error code.
        """
        rest_val = "1" if newval > 0 else "0"
        return self._setAttr("decoding", rest_val)

    def get_edgesPerCycle(self):
        """
        Returns the edge count per full cycle configuration setting.

        @return an integer corresponding to the edge count per full cycle configuration setting

        On failure, throws an exception or returns YQuadratureDecoder.EDGESPERCYCLE_INVALID.
        """
        # res
        if self._cacheExpiration <= YAPI.GetTickCount():
            if self.load(YAPI._yapiContext.GetCacheValidity()) != YAPI.SUCCESS:
                return YQuadratureDecoder.EDGESPERCYCLE_INVALID
        res = self._edgesPerCycle
        return res

    def set_edgesPerCycle(self, newval):
        """
        Changes the edge count per full cycle configuration setting.
        Remember to call the saveToFlash()
        method of the module if the modification must be kept.

        @param newval : an integer corresponding to the edge count per full cycle configuration setting

        @return YAPI.SUCCESS if the call succeeds.

        On failure, throws an exception or returns a negative error code.
        """
        rest_val = str(newval)
        return self._setAttr("edgesPerCycle", rest_val)

    @staticmethod
    def FindQuadratureDecoder(func):
        """
        Retrieves a quadrature decoder for a given identifier.
        The identifier can be specified using several formats:

        - FunctionLogicalName
        - ModuleSerialNumber.FunctionIdentifier
        - ModuleSerialNumber.FunctionLogicalName
        - ModuleLogicalName.FunctionIdentifier
        - ModuleLogicalName.FunctionLogicalName


        This function does not require that the quadrature decoder is online at the time
        it is invoked. The returned object is nevertheless valid.
        Use the method YQuadratureDecoder.isOnline() to test if the quadrature decoder is
        indeed online at a given time. In case of ambiguity when looking for
        a quadrature decoder by logical name, no error is notified: the first instance
        found is returned. The search is performed first by hardware name,
        then by logical name.

        If a call to this object's is_online() method returns FALSE although
        you are certain that the matching device is plugged, make sure that you did
        call registerHub() at application initialization time.

        @param func : a string that uniquely characterizes the quadrature decoder, for instance
                YMXBTN01.quadratureDecoder1.

        @return a YQuadratureDecoder object allowing you to drive the quadrature decoder.
        """
        # obj
        obj = YFunction._FindFromCache("QuadratureDecoder", func)
        if obj is None:
            obj = YQuadratureDecoder(func)
            YFunction._AddToCache("QuadratureDecoder", func, obj)
        return obj

    def nextQuadratureDecoder(self):
        """
        Continues the enumeration of quadrature decoders started using yFirstQuadratureDecoder().
        Caution: You can't make any assumption about the returned quadrature decoders order.
        If you want to find a specific a quadrature decoder, use QuadratureDecoder.findQuadratureDecoder()
        and a hardwareID or a logical name.

        @return a pointer to a YQuadratureDecoder object, corresponding to
                a quadrature decoder currently online, or a None pointer
                if there are no more quadrature decoders to enumerate.
        """
        hwidRef = YRefParam()
        if YAPI.YISERR(self._nextFunction(hwidRef)):
            return None
        if hwidRef.value == "":
            return None
        return YQuadratureDecoder.FindQuadratureDecoder(hwidRef.value)

#--- (end of YQuadratureDecoder implementation)

#--- (YQuadratureDecoder functions)

    @staticmethod
    def FirstQuadratureDecoder():
        """
        Starts the enumeration of quadrature decoders currently accessible.
        Use the method YQuadratureDecoder.nextQuadratureDecoder() to iterate on
        next quadrature decoders.

        @return a pointer to a YQuadratureDecoder object, corresponding to
                the first quadrature decoder currently online, or a None pointer
                if there are none.
        """
        devRef = YRefParam()
        neededsizeRef = YRefParam()
        serialRef = YRefParam()
        funcIdRef = YRefParam()
        funcNameRef = YRefParam()
        funcValRef = YRefParam()
        errmsgRef = YRefParam()
        size = YAPI.C_INTSIZE
        #noinspection PyTypeChecker,PyCallingNonCallable
        p = (ctypes.c_int * 1)()
        err = YAPI.apiGetFunctionsByClass("QuadratureDecoder", 0, p, size, neededsizeRef, errmsgRef)

        if YAPI.YISERR(err) or not neededsizeRef.value:
            return None

        if YAPI.YISERR(
                YAPI.yapiGetFunctionInfo(p[0], devRef, serialRef, funcIdRef, funcNameRef, funcValRef, errmsgRef)):
            return None

        return YQuadratureDecoder.FindQuadratureDecoder(serialRef.value + "." + funcIdRef.value)

#--- (end of YQuadratureDecoder functions)
