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


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

    """
    #--- (end of YCompass class start)
    #--- (YCompass return codes)
    #--- (end of YCompass return codes)
    #--- (YCompass dlldef)
    #--- (end of YCompass dlldef)
    #--- (YCompass yapiwrapper)
    #--- (end of YCompass yapiwrapper)
    #--- (YCompass definitions)
    BANDWIDTH_INVALID = YAPI.INVALID_UINT
    MAGNETICHEADING_INVALID = YAPI.INVALID_DOUBLE
    AXIS_X = 0
    AXIS_Y = 1
    AXIS_Z = 2
    AXIS_INVALID = -1
    #--- (end of YCompass definitions)

    def __init__(self, func):
        super(YCompass, self).__init__(func)
        self._className = 'Compass'
        #--- (YCompass attributes)
        self._callback = None
        self._bandwidth = YCompass.BANDWIDTH_INVALID
        self._axis = YCompass.AXIS_INVALID
        self._magneticHeading = YCompass.MAGNETICHEADING_INVALID
        #--- (end of YCompass attributes)

    #--- (YCompass implementation)
    def _parseAttr(self, json_val):
        if json_val.has("bandwidth"):
            self._bandwidth = json_val.getInt("bandwidth")
        if json_val.has("axis"):
            self._axis = json_val.getInt("axis")
        if json_val.has("magneticHeading"):
            self._magneticHeading = round(json_val.getDouble("magneticHeading") / 65.536) / 1000.0
        super(YCompass, self)._parseAttr(json_val)

    def get_bandwidth(self):
        """
        Returns the measure update frequency, measured in Hz.

        @return an integer corresponding to the measure update frequency, measured in Hz

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

    def set_bandwidth(self, newval):
        """
        Changes the measure update frequency, measured in Hz. When the
        frequency is lower, the device performs averaging.
        Remember to call the saveToFlash()
        method of the module if the modification must be kept.

        @param newval : an integer corresponding to the measure update frequency, measured in Hz

        @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("bandwidth", rest_val)

    def get_axis(self):
        # res
        if self._cacheExpiration <= YAPI.GetTickCount():
            if self.load(YAPI._yapiContext.GetCacheValidity()) != YAPI.SUCCESS:
                return YCompass.AXIS_INVALID
        res = self._axis
        return res

    def get_magneticHeading(self):
        """
        Returns the magnetic heading, regardless of the configured bearing.

        @return a floating point number corresponding to the magnetic heading, regardless of the configured bearing

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

    @staticmethod
    def FindCompass(func):
        """
        Retrieves a compass function 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 compass function is online at the time
        it is invoked. The returned object is nevertheless valid.
        Use the method YCompass.isOnline() to test if the compass function is
        indeed online at a given time. In case of ambiguity when looking for
        a compass function 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 compass function, for instance
                Y3DMK002.compass.

        @return a YCompass object allowing you to drive the compass function.
        """
        # obj
        obj = YFunction._FindFromCache("Compass", func)
        if obj is None:
            obj = YCompass(func)
            YFunction._AddToCache("Compass", func, obj)
        return obj

    def nextCompass(self):
        """
        Continues the enumeration of compass functions started using yFirstCompass().
        Caution: You can't make any assumption about the returned compass functions order.
        If you want to find a specific a compass function, use Compass.findCompass()
        and a hardwareID or a logical name.

        @return a pointer to a YCompass object, corresponding to
                a compass function currently online, or a None pointer
                if there are no more compass functions to enumerate.
        """
        hwidRef = YRefParam()
        if YAPI.YISERR(self._nextFunction(hwidRef)):
            return None
        if hwidRef.value == "":
            return None
        return YCompass.FindCompass(hwidRef.value)

#--- (end of YCompass implementation)

#--- (YCompass functions)

    @staticmethod
    def FirstCompass():
        """
        Starts the enumeration of compass functions currently accessible.
        Use the method YCompass.nextCompass() to iterate on
        next compass functions.

        @return a pointer to a YCompass object, corresponding to
                the first compass function 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("Compass", 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 YCompass.FindCompass(serialRef.value + "." + funcIdRef.value)

#--- (end of YCompass functions)
