/*********************************************************************
 *
 *  $Id: svn_id $
 *
 *  Declares yFindArithmeticSensor(), the high-level API for ArithmeticSensor functions
 *
 *  - - - - - - - - - License information: - - - - - - - - -
 *
 *  Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
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#ifndef YOCTO_ARITHMETICSENSOR_H
#define YOCTO_ARITHMETICSENSOR_H

#include <cfloat>
#include <cmath>

#include "yocto_api.h"

#ifdef YOCTOLIB_NAMESPACE
namespace YOCTOLIB_NAMESPACE
{
#endif

//--- (YArithmeticSensor return codes)
//--- (end of YArithmeticSensor return codes)
//--- (YArithmeticSensor yapiwrapper)
//--- (end of YArithmeticSensor yapiwrapper)
//--- (YArithmeticSensor definitions)
class YArithmeticSensor; // forward declaration

typedef void (*YArithmeticSensorValueCallback)(YArithmeticSensor *func, const string& functionValue);
class YMeasure; // forward declaration
typedef void (*YArithmeticSensorTimedReportCallback)(YArithmeticSensor *func, YMeasure measure);
#define Y_DESCRIPTION_INVALID           (YAPI_INVALID_STRING)
#define Y_COMMAND_INVALID               (YAPI_INVALID_STRING)
//--- (end of YArithmeticSensor definitions)

//--- (YArithmeticSensor declaration)
/**
 * YArithmeticSensor Class: arithmetic sensor control interface, available for instance in the
 * Yocto-MaxiMicroVolt-Rx
 *
 * The YArithmeticSensor class allows some Yoctopuce devices to compute in real-time
 * values based on an arithmetic formula involving one or more measured signals as
 * well as the temperature. As for any physical sensor, the computed values can be
 * read by callback and stored in the built-in datalogger.
 */
class YOCTO_CLASS_EXPORT YArithmeticSensor: public YSensor {
#ifdef __BORLANDC__
#pragma option push -w-8022
#endif
//--- (end of YArithmeticSensor declaration)
protected:
    //--- (YArithmeticSensor attributes)
    // Attributes (function value cache)
    string          _description;
    string          _command;
    YArithmeticSensorValueCallback _valueCallbackArithmeticSensor;
    YArithmeticSensorTimedReportCallback _timedReportCallbackArithmeticSensor;

    friend YArithmeticSensor *yFindArithmeticSensor(const string& func);
    friend YArithmeticSensor *yFirstArithmeticSensor(void);

    // Function-specific method for parsing of JSON output and caching result
    virtual int     _parseAttr(YJSONObject *json_val);

    // Constructor is protected, use yFindArithmeticSensor factory function to instantiate
    YArithmeticSensor(const string& func);
    //--- (end of YArithmeticSensor attributes)

public:
    virtual ~YArithmeticSensor();
    //--- (YArithmeticSensor accessors declaration)

    static const string DESCRIPTION_INVALID;
    static const string COMMAND_INVALID;

    /**
     * Changes the measuring unit for the arithmetic sensor.
     * Remember to call the saveToFlash() method of the module if the
     * modification must be kept.
     *
     * @param newval : a string corresponding to the measuring unit for the arithmetic sensor
     *
     * @return YAPI::SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    int             set_unit(const string& newval);
    inline int      setUnit(const string& newval)
    { return this->set_unit(newval); }

    /**
     * Returns a short informative description of the formula.
     *
     * @return a string corresponding to a short informative description of the formula
     *
     * On failure, throws an exception or returns YArithmeticSensor::DESCRIPTION_INVALID.
     */
    string              get_description(void);

    inline string       description(void)
    { return this->get_description(); }

    string              get_command(void);

    inline string       command(void)
    { return this->get_command(); }

    int             set_command(const string& newval);
    inline int      setCommand(const string& newval)
    { return this->set_command(newval); }

    /**
     * Retrieves an arithmetic 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 arithmetic sensor is online at the time
     * it is invoked. The returned object is nevertheless valid.
     * Use the method isOnline() to test if the arithmetic sensor is
     * indeed online at a given time. In case of ambiguity when looking for
     * an arithmetic 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 arithmetic sensor, for instance
     *         RXUVOLT1.arithmeticSensor1.
     *
     * @return a YArithmeticSensor object allowing you to drive the arithmetic sensor.
     */
    static YArithmeticSensor* FindArithmeticSensor(string func);

    /**
     * Registers the callback function that is invoked on every change of advertised value.
     * The callback is then invoked only during the execution of ySleep or yHandleEvents.
     * 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 NULL pointer as argument.
     *
     * @param callback : the callback function to call, or a NULL 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
     */
    virtual int         registerValueCallback(YArithmeticSensorValueCallback callback);
    using YSensor::registerValueCallback;

    virtual int         _invokeValueCallback(string value);

    /**
     * Registers the callback function that is invoked on every periodic timed notification.
     * The callback is invoked only during the execution of ySleep or yHandleEvents.
     * 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 NULL pointer as argument.
     *
     * @param callback : the callback function to call, or a NULL pointer. The callback function should take two
     *         arguments: the function object of which the value has changed, and an YMeasure object describing
     *         the new advertised value.
     * @noreturn
     */
    virtual int         registerTimedReportCallback(YArithmeticSensorTimedReportCallback callback);
    using YSensor::registerTimedReportCallback;

    virtual int         _invokeTimedReportCallback(YMeasure value);

    /**
     * Defines the arithmetic function by means of an algebraic expression. The expression
     * may include references to device sensors, by their physical or logical name, to
     * usual math functions and to auxiliary functions defined separately.
     *
     * @param expr : the algebraic expression defining the function.
     * @param descr : short informative description of the expression.
     *
     * @return the current expression value if the call succeeds.
     *
     * On failure, throws an exception or returns YAPI::INVALID_DOUBLE.
     */
    virtual double      defineExpression(string expr,string descr);

    /**
     * Retrieves the algebraic expression defining the arithmetic function, as previously
     * configured using the defineExpression function.
     *
     * @return a string containing the mathematical expression.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual string      loadExpression(void);

    /**
     * Defines a auxiliary function by means of a table of reference points. Intermediate values
     * will be interpolated between specified reference points. The reference points are given
     * as pairs of floating point numbers.
     * The auxiliary function will be available for use by all ArithmeticSensor objects of the
     * device. Up to nine auxiliary function can be defined in a device, each containing up to
     * 96 reference points.
     *
     * @param name : auxiliary function name, up to 16 characters.
     * @param inputValues : array of floating point numbers, corresponding to the function input value.
     * @param outputValues : array of floating point numbers, corresponding to the output value
     *         desired for each of the input value, index by index.
     *
     * @return YAPI::SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         defineAuxiliaryFunction(string name,vector<double> inputValues,vector<double> outputValues);

    /**
     * Retrieves the reference points table defining an auxiliary function previously
     * configured using the defineAuxiliaryFunction function.
     *
     * @param name : auxiliary function name, up to 16 characters.
     * @param inputValues : array of floating point numbers, that is filled by the function
     *         with all the function reference input value.
     * @param outputValues : array of floating point numbers, that is filled by the function
     *         output value for each of the input value, index by index.
     *
     * @return YAPI::SUCCESS if the call succeeds.
     *
     * On failure, throws an exception or returns a negative error code.
     */
    virtual int         loadAuxiliaryFunction(string name,vector<double>& inputValues,vector<double>& outputValues);


    inline static YArithmeticSensor *Find(string func)
    { return YArithmeticSensor::FindArithmeticSensor(func); }

    /**
     * Continues the enumeration of arithmetic sensors started using yFirstArithmeticSensor().
     * Caution: You can't make any assumption about the returned arithmetic sensors order.
     * If you want to find a specific an arithmetic sensor, use ArithmeticSensor.findArithmeticSensor()
     * and a hardwareID or a logical name.
     *
     * @return a pointer to a YArithmeticSensor object, corresponding to
     *         an arithmetic sensor currently online, or a NULL pointer
     *         if there are no more arithmetic sensors to enumerate.
     */
           YArithmeticSensor *nextArithmeticSensor(void);
    inline YArithmeticSensor *next(void)
    { return this->nextArithmeticSensor();}

    /**
     * Starts the enumeration of arithmetic sensors currently accessible.
     * Use the method YArithmeticSensor::nextArithmeticSensor() to iterate on
     * next arithmetic sensors.
     *
     * @return a pointer to a YArithmeticSensor object, corresponding to
     *         the first arithmetic sensor currently online, or a NULL pointer
     *         if there are none.
     */
           static YArithmeticSensor *FirstArithmeticSensor(void);
    inline static YArithmeticSensor *First(void)
    { return YArithmeticSensor::FirstArithmeticSensor();}
#ifdef __BORLANDC__
#pragma option pop
#endif
    //--- (end of YArithmeticSensor accessors declaration)
};

//--- (YArithmeticSensor functions declaration)

/**
 * Retrieves an arithmetic 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 arithmetic sensor is online at the time
 * it is invoked. The returned object is nevertheless valid.
 * Use the method isOnline() to test if the arithmetic sensor is
 * indeed online at a given time. In case of ambiguity when looking for
 * an arithmetic 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 arithmetic sensor, for instance
 *         RXUVOLT1.arithmeticSensor1.
 *
 * @return a YArithmeticSensor object allowing you to drive the arithmetic sensor.
 */
inline YArithmeticSensor *yFindArithmeticSensor(const string& func)
{ return YArithmeticSensor::FindArithmeticSensor(func);}
/**
 * Starts the enumeration of arithmetic sensors currently accessible.
 * Use the method YArithmeticSensor::nextArithmeticSensor() to iterate on
 * next arithmetic sensors.
 *
 * @return a pointer to a YArithmeticSensor object, corresponding to
 *         the first arithmetic sensor currently online, or a NULL pointer
 *         if there are none.
 */
inline YArithmeticSensor *yFirstArithmeticSensor(void)
{ return YArithmeticSensor::FirstArithmeticSensor();}

//--- (end of YArithmeticSensor functions declaration)

#ifdef YOCTOLIB_NAMESPACE
// end of namespace definition
}
#endif

#endif
