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


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

    """
    #--- (end of YGroundSpeed class start)
    #--- (YGroundSpeed return codes)
    #--- (end of YGroundSpeed return codes)
    #--- (YGroundSpeed dlldef)
    #--- (end of YGroundSpeed dlldef)
    #--- (YGroundSpeed yapiwrapper)
    #--- (end of YGroundSpeed yapiwrapper)
    #--- (YGroundSpeed definitions)
    #--- (end of YGroundSpeed definitions)

    def __init__(self, func):
        super(YGroundSpeed, self).__init__(func)
        self._className = 'GroundSpeed'
        #--- (YGroundSpeed attributes)
        self._callback = None
        #--- (end of YGroundSpeed attributes)

    #--- (YGroundSpeed implementation)
    def _parseAttr(self, json_val):
        super(YGroundSpeed, self)._parseAttr(json_val)

    @staticmethod
    def FindGroundSpeed(func):
        """
        Retrieves a ground speed sensor 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 ground speed sensor is online at the time
        it is invoked. The returned object is nevertheless valid.
        Use the method YGroundSpeed.isOnline() to test if the ground speed sensor is
        indeed online at a given time. In case of ambiguity when looking for
        a ground speed sensor 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 ground speed sensor, for instance
                YGNSSMK2.groundSpeed.

        @return a YGroundSpeed object allowing you to drive the ground speed sensor.
        """
        # obj
        obj = YFunction._FindFromCache("GroundSpeed", func)
        if obj is None:
            obj = YGroundSpeed(func)
            YFunction._AddToCache("GroundSpeed", func, obj)
        return obj

    def nextGroundSpeed(self):
        """
        Continues the enumeration of ground speed sensors started using yFirstGroundSpeed().
        Caution: You can't make any assumption about the returned ground speed sensors order.
        If you want to find a specific a ground speed sensor, use GroundSpeed.findGroundSpeed()
        and a hardwareID or a logical name.

        @return a pointer to a YGroundSpeed object, corresponding to
                a ground speed sensor currently online, or a None pointer
                if there are no more ground speed sensors to enumerate.
        """
        hwidRef = YRefParam()
        if YAPI.YISERR(self._nextFunction(hwidRef)):
            return None
        if hwidRef.value == "":
            return None
        return YGroundSpeed.FindGroundSpeed(hwidRef.value)

#--- (end of YGroundSpeed implementation)

#--- (YGroundSpeed functions)

    @staticmethod
    def FirstGroundSpeed():
        """
        Starts the enumeration of ground speed sensors currently accessible.
        Use the method YGroundSpeed.nextGroundSpeed() to iterate on
        next ground speed sensors.

        @return a pointer to a YGroundSpeed object, corresponding to
                the first ground speed sensor 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("GroundSpeed", 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 YGroundSpeed.FindGroundSpeed(serialRef.value + "." + funcIdRef.value)

#--- (end of YGroundSpeed functions)
