' ********************************************************************
'
'  $Id: svn_id $
'
'  Implements yFindAltitude(), the high-level API for Altitude functions
'
'  - - - - - - - - - License information: - - - - - - - - -
'
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' *********************************************************************


Imports YDEV_DESCR = System.Int32
Imports YFUN_DESCR = System.Int32
Imports System.Runtime.InteropServices
Imports System.Text

Module yocto_altitude

    REM --- (YAltitude return codes)
    REM --- (end of YAltitude return codes)
    REM --- (YAltitude dlldef)
    REM --- (end of YAltitude dlldef)
   REM --- (YAltitude yapiwrapper)
   REM --- (end of YAltitude yapiwrapper)
  REM --- (YAltitude globals)

  Public Const Y_QNH_INVALID As Double = YAPI.INVALID_DOUBLE
  Public Const Y_TECHNOLOGY_INVALID As String = YAPI.INVALID_STRING
  Public Delegate Sub YAltitudeValueCallback(ByVal func As YAltitude, ByVal value As String)
  Public Delegate Sub YAltitudeTimedReportCallback(ByVal func As YAltitude, ByVal measure As YMeasure)
  REM --- (end of YAltitude globals)

  REM --- (YAltitude class start)

  '''*
  ''' <summary>
  '''   The <c>YAltitude</c> class allows you to read and configure Yoctopuce altimeters.
  ''' <para>
  '''   It inherits from <c>YSensor</c> 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.
  ''' </para>
  ''' </summary>
  '''/
  Public Class YAltitude
    Inherits YSensor
    REM --- (end of YAltitude class start)

    REM --- (YAltitude definitions)
    Public Const QNH_INVALID As Double = YAPI.INVALID_DOUBLE
    Public Const TECHNOLOGY_INVALID As String = YAPI.INVALID_STRING
    REM --- (end of YAltitude definitions)

    REM --- (YAltitude attributes declaration)
    Protected _qnh As Double
    Protected _technology As String
    Protected _valueCallbackAltitude As YAltitudeValueCallback
    Protected _timedReportCallbackAltitude As YAltitudeTimedReportCallback
    REM --- (end of YAltitude attributes declaration)

    Public Sub New(ByVal func As String)
      MyBase.New(func)
      _classname = "Altitude"
      REM --- (YAltitude attributes initialization)
      _qnh = QNH_INVALID
      _technology = TECHNOLOGY_INVALID
      _valueCallbackAltitude = Nothing
      _timedReportCallbackAltitude = Nothing
      REM --- (end of YAltitude attributes initialization)
    End Sub

    REM --- (YAltitude private methods declaration)

    Protected Overrides Function _parseAttr(ByRef json_val As YJSONObject) As Integer
      If json_val.has("qnh") Then
        _qnh = Math.Round(json_val.getDouble("qnh") / 65.536) / 1000.0
      End If
      If json_val.has("technology") Then
        _technology = json_val.getString("technology")
      End If
      Return MyBase._parseAttr(json_val)
    End Function

    REM --- (end of YAltitude private methods declaration)

    REM --- (YAltitude public methods declaration)

    '''*
    ''' <summary>
    '''   Changes the current estimated altitude.
    ''' <para>
    '''   This allows one to compensate for
    '''   ambient pressure variations and to work in relative mode.
    '''   Remember to call the <c>saveToFlash()</c>
    '''   method of the module if the modification must be kept.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="newval">
    '''   a floating point number corresponding to the current estimated altitude
    ''' </param>
    ''' <para>
    ''' </para>
    ''' <returns>
    '''   <c>YAPI.SUCCESS</c> if the call succeeds.
    ''' </returns>
    ''' <para>
    '''   On failure, throws an exception or returns a negative error code.
    ''' </para>
    '''/
    Public Function set_currentValue(ByVal newval As Double) As Integer
      Dim rest_val As String
      rest_val = Ltrim(Str(Math.Round(newval * 65536.0)))
      Return _setAttr("currentValue", rest_val)
    End Function

    '''*
    ''' <summary>
    '''   Changes the barometric pressure adjusted to sea level used to compute
    '''   the altitude (QNH).
    ''' <para>
    '''   This enables you to compensate for atmospheric pressure
    '''   changes due to weather conditions. Applicable to barometric altimeters only.
    '''   Remember to call the <c>saveToFlash()</c>
    '''   method of the module if the modification must be kept.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="newval">
    '''   a floating point number corresponding to the barometric pressure adjusted to sea level used to compute
    '''   the altitude (QNH)
    ''' </param>
    ''' <para>
    ''' </para>
    ''' <returns>
    '''   <c>YAPI.SUCCESS</c> if the call succeeds.
    ''' </returns>
    ''' <para>
    '''   On failure, throws an exception or returns a negative error code.
    ''' </para>
    '''/
    Public Function set_qnh(ByVal newval As Double) As Integer
      Dim rest_val As String
      rest_val = Ltrim(Str(Math.Round(newval * 65536.0)))
      Return _setAttr("qnh", rest_val)
    End Function
    '''*
    ''' <summary>
    '''   Returns the barometric pressure adjusted to sea level used to compute
    '''   the altitude (QNH).
    ''' <para>
    '''   Applicable to barometric altimeters only.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a floating point number corresponding to the barometric pressure adjusted to sea level used to compute
    '''   the altitude (QNH)
    ''' </returns>
    ''' <para>
    '''   On failure, throws an exception or returns <c>YAltitude.QNH_INVALID</c>.
    ''' </para>
    '''/
    Public Function get_qnh() As Double
      Dim res As Double = 0
      If (Me._cacheExpiration <= YAPI.GetTickCount()) Then
        If (Me.load(YAPI._yapiContext.GetCacheValidity()) <> YAPI.SUCCESS) Then
          Return QNH_INVALID
        End If
      End If
      res = Me._qnh
      Return res
    End Function

    '''*
    ''' <summary>
    '''   Returns the technology used by the sesnor to compute
    '''   altitude.
    ''' <para>
    '''   Possibles values are  "barometric" and "gps"
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a string corresponding to the technology used by the sesnor to compute
    '''   altitude
    ''' </returns>
    ''' <para>
    '''   On failure, throws an exception or returns <c>YAltitude.TECHNOLOGY_INVALID</c>.
    ''' </para>
    '''/
    Public Function get_technology() As String
      Dim res As String
      If (Me._cacheExpiration <= YAPI.GetTickCount()) Then
        If (Me.load(YAPI._yapiContext.GetCacheValidity()) <> YAPI.SUCCESS) Then
          Return TECHNOLOGY_INVALID
        End If
      End If
      res = Me._technology
      Return res
    End Function

    '''*
    ''' <summary>
    '''   Retrieves an altimeter for a given identifier.
    ''' <para>
    '''   The identifier can be specified using several formats:
    ''' </para>
    ''' <para>
    ''' </para>
    ''' <para>
    '''   - FunctionLogicalName
    ''' </para>
    ''' <para>
    '''   - ModuleSerialNumber.FunctionIdentifier
    ''' </para>
    ''' <para>
    '''   - ModuleSerialNumber.FunctionLogicalName
    ''' </para>
    ''' <para>
    '''   - ModuleLogicalName.FunctionIdentifier
    ''' </para>
    ''' <para>
    '''   - ModuleLogicalName.FunctionLogicalName
    ''' </para>
    ''' <para>
    ''' </para>
    ''' <para>
    '''   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 <c>YAltitude.isOnline()</c> 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.
    ''' </para>
    ''' <para>
    '''   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.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="func">
    '''   a string that uniquely characterizes the altimeter, for instance
    '''   <c>YALTIMK2.altitude</c>.
    ''' </param>
    ''' <returns>
    '''   a <c>YAltitude</c> object allowing you to drive the altimeter.
    ''' </returns>
    '''/
    Public Shared Function FindAltitude(func As String) As YAltitude
      Dim obj As YAltitude
      obj = CType(YFunction._FindFromCache("Altitude", func), YAltitude)
      If ((obj Is Nothing)) Then
        obj = New YAltitude(func)
        YFunction._AddToCache("Altitude", func, obj)
      End If
      Return obj
    End Function

    '''*
    ''' <summary>
    '''   Registers the callback function that is invoked on every change of advertised value.
    ''' <para>
    '''   The callback is then invoked only during the execution of <c>ySleep</c> or <c>yHandleEvents</c>.
    '''   This provides control over the time when the callback is triggered. For good responsiveness,
    '''   remember to call one of these two functions periodically. The callback is called once juste after beeing
    '''   registered, passing the current advertised value  of the function, provided that it is not an empty string.
    '''   To unregister a callback, pass a Nothing pointer as argument.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="callback">
    '''   the callback function to call, or a Nothing pointer. The callback function should take two
    '''   arguments: the function object of which the value has changed, and the character string describing
    '''   the new advertised value.
    ''' @noreturn
    ''' </param>
    '''/
    Public Overloads Function registerValueCallback(callback As YAltitudeValueCallback) As Integer
      Dim val As String
      If (Not (callback Is Nothing)) Then
        YFunction._UpdateValueCallbackList(Me, True)
      Else
        YFunction._UpdateValueCallbackList(Me, False)
      End If
      Me._valueCallbackAltitude = callback
      REM // Immediately invoke value callback with current value
      If (Not (callback Is Nothing) AndAlso Me.isOnline()) Then
        val = Me._advertisedValue
        If (Not (val = "")) Then
          Me._invokeValueCallback(val)
        End If
      End If
      Return 0
    End Function

    Public Overrides Function _invokeValueCallback(value As String) As Integer
      If (Not (Me._valueCallbackAltitude Is Nothing)) Then
        Me._valueCallbackAltitude(Me, value)
      Else
        MyBase._invokeValueCallback(value)
      End If
      Return 0
    End Function

    '''*
    ''' <summary>
    '''   Registers the callback function that is invoked on every periodic timed notification.
    ''' <para>
    '''   The callback is invoked only during the execution of <c>ySleep</c> or <c>yHandleEvents</c>.
    '''   This provides control over the time when the callback is triggered. For good responsiveness, remember to call
    '''   one of these two functions periodically. To unregister a callback, pass a Nothing pointer as argument.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="callback">
    '''   the callback function to call, or a Nothing pointer. The callback function should take two
    '''   arguments: the function object of which the value has changed, and an <c>YMeasure</c> object describing
    '''   the new advertised value.
    ''' @noreturn
    ''' </param>
    '''/
    Public Overloads Function registerTimedReportCallback(callback As YAltitudeTimedReportCallback) As Integer
      Dim sensor As YSensor
      sensor = Me
      If (Not (callback Is Nothing)) Then
        YFunction._UpdateTimedReportCallbackList(sensor, True)
      Else
        YFunction._UpdateTimedReportCallbackList(sensor, False)
      End If
      Me._timedReportCallbackAltitude = callback
      Return 0
    End Function

    Public Overrides Function _invokeTimedReportCallback(value As YMeasure) As Integer
      If (Not (Me._timedReportCallbackAltitude Is Nothing)) Then
        Me._timedReportCallbackAltitude(Me, value)
      Else
        MyBase._invokeTimedReportCallback(value)
      End If
      Return 0
    End Function


    '''*
    ''' <summary>
    '''   Continues the enumeration of altimeters started using <c>yFirstAltitude()</c>.
    ''' <para>
    '''   Caution: You can't make any assumption about the returned altimeters order.
    '''   If you want to find a specific an altimeter, use <c>Altitude.findAltitude()</c>
    '''   and a hardwareID or a logical name.
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a pointer to a <c>YAltitude</c> object, corresponding to
    '''   an altimeter currently online, or a <c>Nothing</c> pointer
    '''   if there are no more altimeters to enumerate.
    ''' </returns>
    '''/
    Public Function nextAltitude() As YAltitude
      Dim hwid As String = ""
      If (YISERR(_nextFunction(hwid))) Then
        Return Nothing
      End If
      If (hwid = "") Then
        Return Nothing
      End If
      Return YAltitude.FindAltitude(hwid)
    End Function

    '''*
    ''' <summary>
    '''   Starts the enumeration of altimeters currently accessible.
    ''' <para>
    '''   Use the method <c>YAltitude.nextAltitude()</c> to iterate on
    '''   next altimeters.
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a pointer to a <c>YAltitude</c> object, corresponding to
    '''   the first altimeter currently online, or a <c>Nothing</c> pointer
    '''   if there are none.
    ''' </returns>
    '''/
    Public Shared Function FirstAltitude() As YAltitude
      Dim v_fundescr(1) As YFUN_DESCR
      Dim dev As YDEV_DESCR
      Dim neededsize, err As Integer
      Dim serial, funcId, funcName, funcVal As String
      Dim errmsg As String = ""
      Dim size As Integer = Marshal.SizeOf(v_fundescr(0))
      Dim p As IntPtr = Marshal.AllocHGlobal(Marshal.SizeOf(v_fundescr(0)))

      err = yapiGetFunctionsByClass("Altitude", 0, p, size, neededsize, errmsg)
      Marshal.Copy(p, v_fundescr, 0, 1)
      Marshal.FreeHGlobal(p)

      If (YISERR(err) Or (neededsize = 0)) Then
        Return Nothing
      End If
      serial = ""
      funcId = ""
      funcName = ""
      funcVal = ""
      errmsg = ""
      If (YISERR(yapiGetFunctionInfo(v_fundescr(0), dev, serial, funcId, funcName, funcVal, errmsg))) Then
        Return Nothing
      End If
      Return YAltitude.FindAltitude(serial + "." + funcId)
    End Function

    REM --- (end of YAltitude public methods declaration)

  End Class

  REM --- (YAltitude functions)

  '''*
  ''' <summary>
  '''   Retrieves an altimeter for a given identifier.
  ''' <para>
  '''   The identifier can be specified using several formats:
  ''' </para>
  ''' <para>
  ''' </para>
  ''' <para>
  '''   - FunctionLogicalName
  ''' </para>
  ''' <para>
  '''   - ModuleSerialNumber.FunctionIdentifier
  ''' </para>
  ''' <para>
  '''   - ModuleSerialNumber.FunctionLogicalName
  ''' </para>
  ''' <para>
  '''   - ModuleLogicalName.FunctionIdentifier
  ''' </para>
  ''' <para>
  '''   - ModuleLogicalName.FunctionLogicalName
  ''' </para>
  ''' <para>
  ''' </para>
  ''' <para>
  '''   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 <c>YAltitude.isOnline()</c> 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.
  ''' </para>
  ''' <para>
  '''   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.
  ''' </para>
  ''' <para>
  ''' </para>
  ''' </summary>
  ''' <param name="func">
  '''   a string that uniquely characterizes the altimeter, for instance
  '''   <c>YALTIMK2.altitude</c>.
  ''' </param>
  ''' <returns>
  '''   a <c>YAltitude</c> object allowing you to drive the altimeter.
  ''' </returns>
  '''/
  Public Function yFindAltitude(ByVal func As String) As YAltitude
    Return YAltitude.FindAltitude(func)
  End Function

  '''*
  ''' <summary>
  '''   Starts the enumeration of altimeters currently accessible.
  ''' <para>
  '''   Use the method <c>YAltitude.nextAltitude()</c> to iterate on
  '''   next altimeters.
  ''' </para>
  ''' </summary>
  ''' <returns>
  '''   a pointer to a <c>YAltitude</c> object, corresponding to
  '''   the first altimeter currently online, or a <c>Nothing</c> pointer
  '''   if there are none.
  ''' </returns>
  '''/
  Public Function yFirstAltitude() As YAltitude
    Return YAltitude.FirstAltitude()
  End Function


  REM --- (end of YAltitude functions)

End Module
