' ********************************************************************
'
'  $Id: svn_id $
'
'  Implements yFindCurrent(), the high-level API for Current functions
'
'  - - - - - - - - - License information: - - - - - - - - -
'
'  Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
'
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' *********************************************************************


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

Module yocto_current

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

  Public Const Y_ENABLED_FALSE As Integer = 0
  Public Const Y_ENABLED_TRUE As Integer = 1
  Public Const Y_ENABLED_INVALID As Integer = -1
  Public Delegate Sub YCurrentValueCallback(ByVal func As YCurrent, ByVal value As String)
  Public Delegate Sub YCurrentTimedReportCallback(ByVal func As YCurrent, ByVal measure As YMeasure)
  REM --- (end of YCurrent globals)

  REM --- (YCurrent class start)

  '''*
  ''' <summary>
  '''   The <c>YCurrent</c> class allows you to read and configure Yoctopuce current sensors.
  ''' <para>
  '''   It inherits from <c>YSensor</c> class the core functions to read measurements,
  '''   to register callback functions, and to access the autonomous datalogger.
  ''' </para>
  ''' </summary>
  '''/
  Public Class YCurrent
    Inherits YSensor
    REM --- (end of YCurrent class start)

    REM --- (YCurrent definitions)
    Public Const ENABLED_FALSE As Integer = 0
    Public Const ENABLED_TRUE As Integer = 1
    Public Const ENABLED_INVALID As Integer = -1
    REM --- (end of YCurrent definitions)

    REM --- (YCurrent attributes declaration)
    Protected _enabled As Integer
    Protected _valueCallbackCurrent As YCurrentValueCallback
    Protected _timedReportCallbackCurrent As YCurrentTimedReportCallback
    REM --- (end of YCurrent attributes declaration)

    Public Sub New(ByVal func As String)
      MyBase.New(func)
      _classname = "Current"
      REM --- (YCurrent attributes initialization)
      _enabled = ENABLED_INVALID
      _valueCallbackCurrent = Nothing
      _timedReportCallbackCurrent = Nothing
      REM --- (end of YCurrent attributes initialization)
    End Sub

    REM --- (YCurrent private methods declaration)

    Protected Overrides Function _parseAttr(ByRef json_val As YJSONObject) As Integer
      If json_val.has("enabled") Then
        If (json_val.getInt("enabled") > 0) Then _enabled = 1 Else _enabled = 0
      End If
      Return MyBase._parseAttr(json_val)
    End Function

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

    REM --- (YCurrent public methods declaration)
    '''*
    ''' <summary>
    '''   Returns the activation state of this input.
    ''' <para>
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   either <c>YCurrent.ENABLED_FALSE</c> or <c>YCurrent.ENABLED_TRUE</c>, according to the activation
    '''   state of this input
    ''' </returns>
    ''' <para>
    '''   On failure, throws an exception or returns <c>YCurrent.ENABLED_INVALID</c>.
    ''' </para>
    '''/
    Public Function get_enabled() As Integer
      Dim res As Integer
      If (Me._cacheExpiration <= YAPI.GetTickCount()) Then
        If (Me.load(YAPI._yapiContext.GetCacheValidity()) <> YAPI.SUCCESS) Then
          Return ENABLED_INVALID
        End If
      End If
      res = Me._enabled
      Return res
    End Function


    '''*
    ''' <summary>
    '''   Changes the activation state of this voltage input.
    ''' <para>
    '''   When AC measurements are disabled,
    '''   the device will always assume a DC signal, and vice-versa. When both AC and DC measurements
    '''   are active, the device switches between AC and DC mode based on the relative amplitude
    '''   of variations compared to the average value.
    '''   Remember to call the <c>saveToFlash()</c>
    '''   method of the module if the modification must be kept.
    ''' </para>
    ''' <para>
    ''' </para>
    ''' </summary>
    ''' <param name="newval">
    '''   either <c>YCurrent.ENABLED_FALSE</c> or <c>YCurrent.ENABLED_TRUE</c>, according to the activation
    '''   state of this voltage input
    ''' </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_enabled(ByVal newval As Integer) As Integer
      Dim rest_val As String
      If (newval > 0) Then rest_val = "1" Else rest_val = "0"
      Return _setAttr("enabled", rest_val)
    End Function
    '''*
    ''' <summary>
    '''   Retrieves a current sensor 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 current sensor is online at the time
    '''   it is invoked. The returned object is nevertheless valid.
    '''   Use the method <c>YCurrent.isOnline()</c> to test if the current sensor is
    '''   indeed online at a given time. In case of ambiguity when looking for
    '''   a current 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.
    ''' </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 current sensor, for instance
    '''   <c>YAMPMK01.current1</c>.
    ''' </param>
    ''' <returns>
    '''   a <c>YCurrent</c> object allowing you to drive the current sensor.
    ''' </returns>
    '''/
    Public Shared Function FindCurrent(func As String) As YCurrent
      Dim obj As YCurrent
      obj = CType(YFunction._FindFromCache("Current", func), YCurrent)
      If ((obj Is Nothing)) Then
        obj = New YCurrent(func)
        YFunction._AddToCache("Current", 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 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 the character string describing
    '''   the new advertised value.
    ''' @noreturn
    ''' </param>
    '''/
    Public Overloads Function registerValueCallback(callback As YCurrentValueCallback) As Integer
      Dim val As String
      If (Not (callback Is Nothing)) Then
        YFunction._UpdateValueCallbackList(Me, True)
      Else
        YFunction._UpdateValueCallbackList(Me, False)
      End If
      Me._valueCallbackCurrent = 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._valueCallbackCurrent Is Nothing)) Then
        Me._valueCallbackCurrent(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 YCurrentTimedReportCallback) 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._timedReportCallbackCurrent = callback
      Return 0
    End Function

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


    '''*
    ''' <summary>
    '''   Continues the enumeration of current sensors started using <c>yFirstCurrent()</c>.
    ''' <para>
    '''   Caution: You can't make any assumption about the returned current sensors order.
    '''   If you want to find a specific a current sensor, use <c>Current.findCurrent()</c>
    '''   and a hardwareID or a logical name.
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a pointer to a <c>YCurrent</c> object, corresponding to
    '''   a current sensor currently online, or a <c>Nothing</c> pointer
    '''   if there are no more current sensors to enumerate.
    ''' </returns>
    '''/
    Public Function nextCurrent() As YCurrent
      Dim hwid As String = ""
      If (YISERR(_nextFunction(hwid))) Then
        Return Nothing
      End If
      If (hwid = "") Then
        Return Nothing
      End If
      Return YCurrent.FindCurrent(hwid)
    End Function

    '''*
    ''' <summary>
    '''   Starts the enumeration of current sensors currently accessible.
    ''' <para>
    '''   Use the method <c>YCurrent.nextCurrent()</c> to iterate on
    '''   next current sensors.
    ''' </para>
    ''' </summary>
    ''' <returns>
    '''   a pointer to a <c>YCurrent</c> object, corresponding to
    '''   the first current sensor currently online, or a <c>Nothing</c> pointer
    '''   if there are none.
    ''' </returns>
    '''/
    Public Shared Function FirstCurrent() As YCurrent
      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("Current", 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 YCurrent.FindCurrent(serial + "." + funcId)
    End Function

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

  End Class

  REM --- (YCurrent functions)

  '''*
  ''' <summary>
  '''   Retrieves a current sensor 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 current sensor is online at the time
  '''   it is invoked. The returned object is nevertheless valid.
  '''   Use the method <c>YCurrent.isOnline()</c> to test if the current sensor is
  '''   indeed online at a given time. In case of ambiguity when looking for
  '''   a current 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.
  ''' </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 current sensor, for instance
  '''   <c>YAMPMK01.current1</c>.
  ''' </param>
  ''' <returns>
  '''   a <c>YCurrent</c> object allowing you to drive the current sensor.
  ''' </returns>
  '''/
  Public Function yFindCurrent(ByVal func As String) As YCurrent
    Return YCurrent.FindCurrent(func)
  End Function

  '''*
  ''' <summary>
  '''   Starts the enumeration of current sensors currently accessible.
  ''' <para>
  '''   Use the method <c>YCurrent.nextCurrent()</c> to iterate on
  '''   next current sensors.
  ''' </para>
  ''' </summary>
  ''' <returns>
  '''   a pointer to a <c>YCurrent</c> object, corresponding to
  '''   the first current sensor currently online, or a <c>Nothing</c> pointer
  '''   if there are none.
  ''' </returns>
  '''/
  Public Function yFirstCurrent() As YCurrent
    Return YCurrent.FirstCurrent()
  End Function


  REM --- (end of YCurrent functions)

End Module
