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


#--- (YAltitude class start)
#noinspection PyProtectedMember
class YAltitude(YSensor):
    """
    The YAltitude class allows you to read and configure Yoctopuce altimeters.
    It inherits from YSensor class the core functions to read measurements,
    to register callback functions, and to access the autonomous datalogger.
    This class adds the ability to configure the barometric pressure adjusted to
    sea level (QNH) for barometric sensors.

    """
    #--- (end of YAltitude class start)
    #--- (YAltitude return codes)
    #--- (end of YAltitude return codes)
    #--- (YAltitude dlldef)
    #--- (end of YAltitude dlldef)
    #--- (YAltitude yapiwrapper)
    #--- (end of YAltitude yapiwrapper)
    #--- (YAltitude definitions)
    QNH_INVALID = YAPI.INVALID_DOUBLE
    TECHNOLOGY_INVALID = YAPI.INVALID_STRING
    #--- (end of YAltitude definitions)

    def __init__(self, func):
        super(YAltitude, self).__init__(func)
        self._className = 'Altitude'
        #--- (YAltitude attributes)
        self._callback = None
        self._qnh = YAltitude.QNH_INVALID
        self._technology = YAltitude.TECHNOLOGY_INVALID
        #--- (end of YAltitude attributes)

    #--- (YAltitude implementation)
    def _parseAttr(self, json_val):
        if json_val.has("qnh"):
            self._qnh = round(json_val.getDouble("qnh") / 65.536) / 1000.0
        if json_val.has("technology"):
            self._technology = json_val.getString("technology")
        super(YAltitude, self)._parseAttr(json_val)

    def set_currentValue(self, newval):
        """
        Changes the current estimated altitude. This allows one to compensate for
        ambient pressure variations and to work in relative mode.
        Remember to call the saveToFlash()
        method of the module if the modification must be kept.

        @param newval : a floating point number corresponding to the current estimated altitude

        @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 set_qnh(self, newval):
        """
        Changes the barometric pressure adjusted to sea level used to compute
        the altitude (QNH). This enables you to compensate for atmospheric pressure
        changes due to weather conditions. Applicable to barometric altimeters only.
        Remember to call the saveToFlash()
        method of the module if the modification must be kept.

        @param newval : a floating point number corresponding to the barometric pressure adjusted to sea
        level used to compute
                the altitude (QNH)

        @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("qnh", rest_val)

    def get_qnh(self):
        """
        Returns the barometric pressure adjusted to sea level used to compute
        the altitude (QNH). Applicable to barometric altimeters only.

        @return a floating point number corresponding to the barometric pressure adjusted to sea level used to compute
                the altitude (QNH)

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

    def get_technology(self):
        """
        Returns the technology used by the sesnor to compute
        altitude. Possibles values are  "barometric" and "gps"

        @return a string corresponding to the technology used by the sesnor to compute
                altitude

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

    @staticmethod
    def FindAltitude(func):
        """
        Retrieves an altimeter 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 altimeter is online at the time
        it is invoked. The returned object is nevertheless valid.
        Use the method YAltitude.isOnline() to test if the altimeter is
        indeed online at a given time. In case of ambiguity when looking for
        an altimeter 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 altimeter, for instance
                YALTIMK2.altitude.

        @return a YAltitude object allowing you to drive the altimeter.
        """
        # obj
        obj = YFunction._FindFromCache("Altitude", func)
        if obj is None:
            obj = YAltitude(func)
            YFunction._AddToCache("Altitude", func, obj)
        return obj

    def nextAltitude(self):
        """
        Continues the enumeration of altimeters started using yFirstAltitude().
        Caution: You can't make any assumption about the returned altimeters order.
        If you want to find a specific an altimeter, use Altitude.findAltitude()
        and a hardwareID or a logical name.

        @return a pointer to a YAltitude object, corresponding to
                an altimeter currently online, or a None pointer
                if there are no more altimeters to enumerate.
        """
        hwidRef = YRefParam()
        if YAPI.YISERR(self._nextFunction(hwidRef)):
            return None
        if hwidRef.value == "":
            return None
        return YAltitude.FindAltitude(hwidRef.value)

#--- (end of YAltitude implementation)

#--- (YAltitude functions)

    @staticmethod
    def FirstAltitude():
        """
        Starts the enumeration of altimeters currently accessible.
        Use the method YAltitude.nextAltitude() to iterate on
        next altimeters.

        @return a pointer to a YAltitude object, corresponding to
                the first altimeter 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("Altitude", 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 YAltitude.FindAltitude(serialRef.value + "." + funcIdRef.value)

#--- (end of YAltitude functions)
