/**************************************************************************
*
* Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
*
* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
*
* @file SelfTests.c
*
* @author (last) Quang Nguyen
* @date (last) 28-Jan-2021
*
* @author (original) Quang Nguyen
* @date (original) 28-Jan-2021
*
***************************************************************************/

#include "AirTrap.h"
#include "BloodFlow.h"
#include "DGInterface.h"
#include "DialInFlow.h"
#include "DialOutFlow.h"
#include "FPGA.h"
#include "ModeTreatmentParams.h"
#include "PresOccl.h"
#include "SelfTests.h"
#include "SyringePump.h"
#include "SystemCommMessages.h"
#include "TaskGeneral.h"
#include "Timers.h"
#include "Valves.h"

/**
 *  @addtogroup SelfTests
 *  @{
 */

// ********** private definitions **********

#define PUMP_RUN_SELF_TEST_TIME_MS                          ( 15 * MS_PER_SECOND )                  ///< Self-test time to run pumps in ms.
#define PUMP_SELF_TEST_FLOW_RATE_ML_MIN                     100                                     ///< Self-test pump flow rate in mL/min.

#define BLOOD_LEAK_SELF_TEST_SET                            0x1                                     ///< Initiate blood leak self-test.
#define BLOOD_LEAK_NORMAL_OPERATION                         0x0                                     ///< Return blood leak to normal operation.

#define BLOOD_PUMP_RUN_TIME_PRESSURE_SELF_TEST              ( 5 * MS_PER_SECOND )                   ///< Pressure self-test time to run blood pump in ms.
#define NORMALIZED_PRESSURE_SELF_TEST_TIME                  ( 2 * MS_PER_SECOND )                   ///< Time to wait for pressure to normalize in ms.

#define ARTERIAL_PRESSURE_SELF_TEST_LOW_LIMIT_MMHG          -50.0                                   ///< Arterial pressure low limit after running blood pump.
#define VENOUS_PRESSURE_SELF_TEST_HIGH_LIMIT_MMHG           400                                     ///< Venous pressure high limit after running blood pump.

#define NORMAL_PRESSURE_DIFF_TOLERANCE_MMHG                 5.0                                     ///< Difference in pressure readings after return to normal state tolerance (in mmHg).

#define DIP_FLOW_RATE_SETUP_ML_MIN                          150                                     ///< Dialysate inlet pump flow rate during the setup for wet self-test.
#define DIP_FLOW_RATE_FIRST_DISPLACEMENT_ML_MIN             100                                     ///< Dialysate inlet pump flow rate during the first displacement in wet self-test.
#define DIP_FLOW_RATE_SECOND_DISPLACEMENT_ML_MIN            600                                     ///< Dialysate inlet pump flow rate during the second displacement in wet self-test.

#define WET_SELF_TEST_RESERVOIR_ONE_SETUP_VOLUME_ML         1200.0                                  ///< Setup volume for reservoir one before wet self-test in ml.
#define WET_SELF_TEST_FIRST_DISPLACEMENT_TARGET_VOLUME_ML   100.0                                   ///< Target of first displacement volume in ml.
#define WET_SELF_TEST_SECOND_DISPLACEMENT_TARGET_VOLUME_ML  600.0                                   ///< Target of second displacement volume in ml.
#define WET_SELF_TEST_INTEGRATED_VOLUME_TOLERANCE           5.0                                     ///< Tolerance on integrated volume in percentage.
#define WET_SELF_TEST_DISPLACEMENT_TOLERANCE_G              1.5                                     ///< Tolerance in the load cell readings of the displacement in grams.
#define WET_SELF_TEST_DISPLACEMENT_TIME_MS                  ( SEC_PER_MIN * MS_PER_SECOND )         ///< Time to displace dialysate in wet self-test in ms.
#define RESERVOIR_SETTLE_TIME_MS                            ( 4 *  MS_PER_SECOND )                  ///< Time allotted for reservoir to settle in ms.

#define MAX_NO_CARTRIDGE_SELF_TEST_TIME                     30                                       ///< Maximum no cartridge self-test time (in seconds).
#define MAX_DRY_SELF_TEST_TIME                              ( 3 * SEC_PER_MIN )                     ///< Maximum dry self-test time (in seconds).

#define SELF_TEST_TIME_DATA_PUB_INTERVAL                    ( MS_PER_SECOND )                       ///< Interval (ms/task time) at which self-test time data is published on the CAN bus.

/// Multiplier to conver flow (mL/min) into volume (mL) for period of general task interval.
static const F32 SELF_TEST_FLOW_INTEGRATOR = ( ( 1.0 * TASK_GENERAL_INTERVAL ) / ( SEC_PER_MIN * MS_PER_SECOND ) );

/// Wet self-tests state machine.
typedef enum Wet_Self_Tests_State
{
    WET_SELF_TESTS_START_STATE = 0,                         ///< Wet self-tests starting state.
    WET_SELF_TESTS_SETUP_STATE,                             ///< Setup reservoirs for wet self-tests.
    WET_SELF_TESTS_PRIME_CHECK_STATE,                       ///< Prime check wet self-tests state, checks for primed patient lines.
    WET_SELF_TESTS_FIRST_DISPLACEMENT_SETUP_STATE,          ///< Setup valve and start dialysate pump for first displacement.
    WET_SELF_TESTS_FIRST_DISPLACEMENT_STATE,                ///< Fill reservoir 2 with 100 mL of dialysate from reservoir 1 state.
    WET_SELF_TESTS_FIRST_DISPLACEMENT_VERIFY_STATE,         ///< After first displacement completed verify state.
    WET_SELF_TESTS_SECOND_DISPLACEMENT_SETUP_STATE,         ///< Setup valve and start dialysate pump for second displacement.
    WET_SELF_TESTS_SECOND_DISPLACEMENT_STATE,               ///< Fill reservoir 1 with 300 mL of dialysate from reservoir 2 state.
    WET_SELF_TESTS_SECOND_DISPLACEMENT_VERIFY_STATE,        ///< After first displacement completed verify state.
    WET_SELF_TESTS_STOPPED_STATE,                           ///< Wet self-test stopped state.
    WET_SELF_TESTS_COMPLETE_STATE,                          ///< Wet self-test complete state.
    NUM_OF_WET_SELF_TESTS_STATES                            ///< Number of wet self-tests states.
} WET_SELF_TESTS_STATE_T;

// ********** private data **********

static NO_CART_SELF_TESTS_STATE_T currentNoCartSelfTestsState;      ///< Current state of the no cartridge self-tests state machine.
static U32 runPumpStartTime;                                        ///< Beginning time when pumps start running
static BOOL havePumpsStarted;                                       ///< Flag indicates pumps have started running for self-test.

static DRY_SELF_TESTS_STATE_T currentDrySelfTestsState;             ///< Current state of the dry self-tests state machine.
static U32 pressureSelfTestBloodPumpRunStartTime;                   ///< Pressure dry self-test blood pump runs start time.
static U32 pressureSelfTestNormalizedStartTime;                     ///< Normalized pressure dry self-test start time.
static F32 previousNormalArterialPressure;                          ///< Holds the previous normal arterial pressure reading.
static F32 previousNormalVenousPressure;                            ///< Holds the previous normal venous pressure reading.

static BOOL wetSelfTestsResult;                                     ///< Result of wet self-tests.
static WET_SELF_TESTS_STATE_T currentWetSelfTestsState;             ///< Current state of the wet self-tests state machine.
static U32 settleStartTime;                                         ///< Wait for reservoir to settle start time.
static U32 displacementStartTime;                                   ///< Dialysate displacement starting time.
static F32 fmdIntegratedVolume;                                     ///< FMD integrated volume over displacement time.
static F32 reservoirVolume[ NUM_OF_DG_RESERVOIRS ];                 ///< Hold the current volume of all reservoirs.
static F32 setupDisplacementVolume;                                 ///< Hold the setup displacement volume to get reservoir one to target volume.
static BOOL isValvesSettingSent;                                    ///< Flag indicates valve setting change has been send to DG.

static U32 selfTestStartTime;                                       ///< Starting time of self-test (in ms).
static U32 selfTestPreviousPublishDataTime;                         ///< Last time self-test time data is being published (in ms).

static BOOL useHeparin;                                             ///< Flag indicates the user of heparin.

static BOOL selfTestsResumeRequested;                               ///< Flag indicates user requesting self-tests resume.

// ********** private function prototypes **********

static void resetSelfTestsFlags( void );
static void setupForSelfTestsStop( void );

static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestsWaitForClosedDoor( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestLeakDetectorsState( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeValvesState( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeSyringePumpState( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestPumpsState( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeIdleState( void );
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestStoppedState( void );

static DRY_SELF_TESTS_STATE_T handleDrySelfTestWaitForDoorCloseState( void );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestUsedCartridgeCheckState( void );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsSetupState( void );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsState( SELF_TEST_STATUS_T *result );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsNormalState( SELF_TEST_STATUS_T *result );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestSyringePumpPrimeState( void );
static DRY_SELF_TESTS_STATE_T handleDrySelfTestStoppedState( void );

static WET_SELF_TESTS_STATE_T handleWetSelfTestStartState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestSetupState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestPrimeCheckState( SELF_TEST_STATUS_T *result );
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementSetupState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementVerifyState( SELF_TEST_STATUS_T *result );
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementSetupState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementState( void );
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementVerifyState( SELF_TEST_STATUS_T *result );
static WET_SELF_TESTS_STATE_T handleWetSelfTestStoppedState( void );

/*********************************************************************//**
 * @brief
 * The initSelfTests function initializes the SelfTests module.
 * @details Inputs: none
 * @details Outputs: SelfTests module initialized.
 * @return none
 *************************************************************************/
void initSelfTests( void )
{
    selfTestStartTime = 0;
    selfTestPreviousPublishDataTime = 0;
}

/*********************************************************************//**
 * @brief
 * The signalResumeSelfTests function signals the self-tests to resume
 * previous operation.
 * @details Inputs: none
 * @details Outputs: primeResumeRequested
 * @return none
 *************************************************************************/
void signalResumeSelfTests( void )
{
    selfTestsResumeRequested = TRUE;
}

/*********************************************************************//**
 * @brief
 * The resetSelfTestsFlags function resets all self-tests signal flags.
 * @details Inputs: none
 * @details Outputs: signal flags set to FALSE
 * @return none
 *************************************************************************/
static void resetSelfTestsFlags( void )
{
    selfTestsResumeRequested = FALSE;
}

/*********************************************************************//**
 * @brief
 * The setupForSelfTestsStop function sets actuators appropriately for self-tests
 * states.
 * @details Inputs: none
 * @details Outputs: All pumps stopped
 * @return none
 *************************************************************************/
static void setupForSelfTestsStop( void )
{
    signalBloodPumpHardStop();
    signalDialInPumpHardStop();
    signalDialOutPumpHardStop();
    stopSyringePump();
}

/*********************************************************************//**
 * @brief
 * The transitionToNoCartSelfTests function resets anything required before
 * the start of no cartridge self-tests.
 * @details Inputs: none
 * @details Outputs: No cartridge self-tests re-initialized.
 * @return none
 *************************************************************************/
void transitionToNoCartSelfTests( void )
{
    F32 const bolusVol = getTreatmentParameterF32( TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME );
    F32 const hepRate = getTreatmentParameterF32( TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME );

#ifndef DISABLE_SYRINGE_PUMP
    useHeparin = ( ( bolusVol > 0.0 ) || ( hepRate > 0.0 ) );
#else
    useHeparin = FALSE;
#endif
    currentNoCartSelfTestsState = NO_CART_SELF_TESTS_START_STATE;
    runPumpStartTime = 0;
    havePumpsStarted = FALSE;
    selfTestStartTime = getMSTimerCount();
    selfTestPreviousPublishDataTime = getMSTimerCount();

    resetSelfTestsFlags();
}

/*********************************************************************//**
 * @brief
 * The execNoCartSelfTests function executes the no cartridge self-tests
 * state machine.
 * @details Inputs: currentNoCartSelfTestsState
 * @details Outputs: currentNoCartSelfTestsState
 * @return none
 *************************************************************************/
void execNoCartSelfTests( void )
{
    // execute no cartridge self-tests state machine
    switch ( currentNoCartSelfTestsState )
    {
        case NO_CART_SELF_TESTS_START_STATE:
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;
            break;

        case NO_CART_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestsWaitForClosedDoor();
            break;

        case NO_CART_SELF_TESTS_OCCLUSION_SENSORS_STATE:
            execPresOcclTest();
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_BLOOD_FLOW_METERS_STATE;
            break;

        case NO_CART_SELF_TESTS_BLOOD_FLOW_METERS_STATE:
            execBloodFlowTest();
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_DIALYSATE_FLOW_METERS_STATE;
            break;

        case NO_CART_SELF_TESTS_DIALYSATE_FLOW_METERS_STATE:
            execDialInFlowTest();

            // TODO: Use appropriate sensor driver
            setFPGASensorTest( BLOOD_LEAK_SELF_TEST_SET );
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_LEAK_DETECTORS_STATE;
            break;

        case NO_CART_SELF_TESTS_LEAK_DETECTORS_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestLeakDetectorsState();
            break;

        case NO_CART_SELF_TESTS_BOARD_TEMPERATURE_STATE:
            // TODO: Implement self tests
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_HOME_VALVES_STATE;
            break;

        case NO_CART_SELF_TESTS_HOME_VALVES_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestHomeValvesState();
            break;

        case NO_CART_SELF_TESTS_HOME_SYRINGE_PUMP_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestHomeSyringePumpState();
            break;

        case NO_CART_SELF_TESTS_PUMPS_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestPumpsState();
            break;

        case NO_CART_SELF_TESTS_HOME_IDLE_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestHomeIdleState();
            break;

        case NO_CART_SELF_TESTS_STOPPED_STATE:
            currentNoCartSelfTestsState = handleNoCartSelfTestStoppedState();
            break;

        case NO_CART_SELF_TESTS_COMPLETE_STATE:
            break;

        default:
            currentNoCartSelfTestsState = NO_CART_SELF_TESTS_START_STATE;
            SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_SOFTWARE_FAULT, SW_FAULT_ID_HD_INVALID_NO_CARTRIDGE_SELF_TEST_STATE, (U32)currentNoCartSelfTestsState );
            break;
    }

    // Self-tests flags should be handled by now, reset if flags not handled with current state
    resetSelfTestsFlags();

    // Publish current self-test time data
    if ( calcTimeSince( selfTestPreviousPublishDataTime ) >= SELF_TEST_TIME_DATA_PUB_INTERVAL )
    {
        U32 const elapsedSelfTestTimeInSecs = calcTimeSince( selfTestStartTime ) / MS_PER_SECOND;

        selfTestPreviousPublishDataTime = getMSTimerCount();
        broadcastNoCartSelfTestTime( MAX_NO_CARTRIDGE_SELF_TEST_TIME, ( MAX_NO_CARTRIDGE_SELF_TEST_TIME - elapsedSelfTestTimeInSecs ) );
    }
}

/*********************************************************************//**
 * @brief
 * The getNoCartSelfTestsState function returns the current state of no
 * cartridge self-tests sub-mode.
 * @details Inputs: currentNoCartSelfTestsState
 * @details Outputs: none
 * @return current no cartridge self-tests state
 *************************************************************************/
U32 getNoCartSelfTestsState( void )
{
    return (U32)currentNoCartSelfTestsState;
}

/*********************************************************************//**
 * @brief
 * The transitionToDrySelfTests function resets anything required before
 * the start of dry self-tests.
 * @details Inputs: none
 * @details Outputs: Dry self-tests re-initialized.
 * @return none
 *************************************************************************/
void transitionToDrySelfTests()
{
    F32 const bolusVol = getTreatmentParameterF32( TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME );
    F32 const hepRate = getTreatmentParameterF32( TREATMENT_PARAM_HEPARIN_BOLUS_VOLUME );

#ifndef DISABLE_SYRINGE_PUMP
    useHeparin = ( ( bolusVol > 0.0 ) || ( hepRate > 0.0 ) );
#else
    useHeparin = FALSE;
#endif
    currentDrySelfTestsState = DRY_SELF_TESTS_START_STATE;
    pressureSelfTestBloodPumpRunStartTime = 0;
    pressureSelfTestNormalizedStartTime = 0;
    previousNormalArterialPressure = 0.0;
    previousNormalVenousPressure = 0.0;
    selfTestStartTime = getMSTimerCount();
    selfTestPreviousPublishDataTime = getMSTimerCount();

    resetSelfTestsFlags();
}

/*********************************************************************//**
 * @brief
 * The execDrySelfTests function executes the dry self-tests state machine.
 * @details Inputs: currentDrySelfTestsState
 * @details Outputs: currentDrySelfTestsState
 * @return none
 *************************************************************************/
void execDrySelfTests( void )
{
    SELF_TEST_STATUS_T result = SELF_TEST_STATUS_PASSED;

    // execute dry self-tests state machine
    switch ( currentDrySelfTestsState )
    {
        case DRY_SELF_TESTS_START_STATE:
#ifdef SKIP_DRY_SELF_TESTS
            // TODO: Remove once dry self-test is ready to use
            currentDrySelfTestsState = DRY_SELF_TESTS_SYRINGE_PUMP_PRIME_STATE;
#else
            currentDrySelfTestsState = DRY_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;
#endif
            break;

        case DRY_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE:
            currentDrySelfTestsState = handleDrySelfTestWaitForDoorCloseState();
            break;

        case DRY_SELF_TESTS_USED_CARTRIDGE_CHECK_STATE:
            currentDrySelfTestsState = handleDrySelfTestUsedCartridgeCheckState();
            break;

        case DRY_SELF_TESTS_OCCLUSION_SENSORS_STATE:
            if ( SELF_TEST_STATUS_PASSED == execPresOcclDryTest() )
            {
                setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
                setValvePosition( VDO, VALVE_POSITION_C_CLOSE );
                setValvePosition( VBA, VALVE_POSITION_C_CLOSE );
                setValvePosition( VBV, VALVE_POSITION_C_CLOSE );
                setValveAirTrap( STATE_OPEN );
                currentDrySelfTestsState = DRY_SELF_TESTS_PRESSURE_SENSORS_SETUP_STATE;
            }
            break;

        case DRY_SELF_TESTS_PRESSURE_SENSORS_SETUP_STATE:
            currentDrySelfTestsState = handleDrySelfTestPressureSensorsSetupState();
            break;

        case DRY_SELF_TESTS_PRESSURE_SENSORS_STATE:
            currentDrySelfTestsState = handleDrySelfTestPressureSensorsState( &result );
            break;

        case DRY_SELF_TESTS_PRESSURE_SENSORS_NORMAL_STATE:
            currentDrySelfTestsState = handleDrySelfTestPressureSensorsNormalState( &result );
            break;

        case DRY_SELF_TESTS_SYRINGE_PUMP_PRIME_STATE:
            currentDrySelfTestsState = handleDrySelfTestSyringePumpPrimeState();
            break;

        case DRY_SELF_TESTS_STOPPED_STATE:
            currentDrySelfTestsState = handleDrySelfTestStoppedState();
            break;

        case DRY_SELF_TESTS_COMPLETE_STATE:
            break;

        default:
            currentDrySelfTestsState = DRY_SELF_TESTS_START_STATE;
            SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_SOFTWARE_FAULT, SW_FAULT_ID_HD_INVALID_DRY_SELF_TEST_STATE, (U32)currentDrySelfTestsState );
            break;
    }

    // Self-tests flags should be handled by now, reset if flags not handled with current state
    resetSelfTestsFlags();

    if ( SELF_TEST_STATUS_FAILED == result )
    {
        SET_ALARM_WITH_1_U32_DATA( ALARM_ID_PRE_TREATMENT_DRY_SELF_TEST_FAILURE, currentDrySelfTestsState );
    }

    // Publish current self-test time data
    if ( calcTimeSince( selfTestPreviousPublishDataTime ) >= SELF_TEST_TIME_DATA_PUB_INTERVAL )
    {
        U32 const elapsedSelfTestTimeInSecs = calcTimeSince( selfTestStartTime ) / MS_PER_SECOND;

        selfTestPreviousPublishDataTime = getMSTimerCount();
        broadcastDrySelfTestTime( MAX_DRY_SELF_TEST_TIME, ( MAX_DRY_SELF_TEST_TIME - elapsedSelfTestTimeInSecs ) );
    }
}

/*********************************************************************//**
 * @brief
 * The getDrySelfTestsState function returns the current state of dry self-tests sub-mode.
 * @details Inputs: currentDrySelfTestsState
 * @details Outputs: none
 * @return current dry self-tests state
 *************************************************************************/
U32 getDrySelfTestsState( void )
{
    return (U32)currentDrySelfTestsState;
}

/*********************************************************************//**
 * @brief
 * The transitionToWetSelfTests function resets anything required before
 * the start of wet self-tests.
 * @details Inputs: none
 * @details Outputs: Wet self-tests re-initialized.
 * @return none
 *************************************************************************/
void transitionToWetSelfTests()
{
    wetSelfTestsResult = FALSE;
    currentWetSelfTestsState = WET_SELF_TESTS_START_STATE;
    settleStartTime = 0;
    displacementStartTime = 0;
    fmdIntegratedVolume = 0.0;
    isValvesSettingSent = FALSE;
    selfTestStartTime = getMSTimerCount();
    selfTestPreviousPublishDataTime = getMSTimerCount();

    resetSelfTestsFlags();
}

/*********************************************************************//**
 * @brief
 * The execWetSelfTests function executes the wet self-tests state machine.
 * @details Inputs: currentWetSelfTestsState
 * @details Outputs: currentWetSelfTestsState, wetSelfTestsResult
 * @return none
 *************************************************************************/
void execWetSelfTests( void )
{
    SELF_TEST_STATUS_T result = SELF_TEST_STATUS_PASSED;

    // execute wet self-tests state machine
    switch ( currentWetSelfTestsState )
    {
        case WET_SELF_TESTS_START_STATE:
            currentWetSelfTestsState = handleWetSelfTestStartState();
            break;

        case WET_SELF_TESTS_SETUP_STATE:
            currentWetSelfTestsState = handleWetSelfTestSetupState();
            break;

        case WET_SELF_TESTS_PRIME_CHECK_STATE:
            currentWetSelfTestsState = handleWetSelfTestPrimeCheckState( &result );
            break;

        case WET_SELF_TESTS_FIRST_DISPLACEMENT_SETUP_STATE:
            currentWetSelfTestsState = handleWetSelfTestFirstDisplacementSetupState();
            break;

        case WET_SELF_TESTS_FIRST_DISPLACEMENT_STATE:
            currentWetSelfTestsState = handleWetSelfTestFirstDisplacementState();
            break;

        case WET_SELF_TESTS_FIRST_DISPLACEMENT_VERIFY_STATE:
            currentWetSelfTestsState = handleWetSelfTestFirstDisplacementVerifyState( &result );
            break;

        case WET_SELF_TESTS_SECOND_DISPLACEMENT_SETUP_STATE:
            currentWetSelfTestsState = handleWetSelfTestSecondDisplacementSetupState();
            break;

        case WET_SELF_TESTS_SECOND_DISPLACEMENT_STATE:
            currentWetSelfTestsState = handleWetSelfTestSecondDisplacementState();
            break;

        case WET_SELF_TESTS_SECOND_DISPLACEMENT_VERIFY_STATE:
            currentWetSelfTestsState = handleWetSelfTestSecondDisplacementVerifyState( &result );
            break;

        case WET_SELF_TESTS_STOPPED_STATE:
            currentWetSelfTestsState = handleWetSelfTestStoppedState();
            break;

        case WET_SELF_TESTS_COMPLETE_STATE:
            wetSelfTestsResult = TRUE;
            break;

        default:
            currentWetSelfTestsState = WET_SELF_TESTS_START_STATE;
            SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_SOFTWARE_FAULT, SW_FAULT_ID_HD_INVALID_WET_SELF_TEST_STATE, (U32)currentWetSelfTestsState );
            break;
    }

    // Self-tests flags should be handled by now, reset if flags not handled with current state
    resetSelfTestsFlags();

    if ( SELF_TEST_STATUS_FAILED == result )
    {
        SET_ALARM_WITH_1_U32_DATA( ALARM_ID_PRE_TREATMENT_WET_SELF_TEST_FAILURE, currentWetSelfTestsState );
    }
}

/*********************************************************************//**
 * @brief
 * The isDrySelfTestsPassed function returns the status of wet self-tests.
 * @details Inputs: none
 * @details Outputs: none
 * @return TRUE if wet self-tests passed, otherwise FALSE
 *************************************************************************/
BOOL isWetSelfTestsPassed( void )
{
    return wetSelfTestsResult;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartridgeWaitForClosedDoor function executes the wait for
 * door to be closed state of no cartridge self-tests state machine.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestsWaitForClosedDoor( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;

    signalBloodPumpHardStop();
    signalDialInPumpHardStop();
    signalDialOutPumpHardStop();

    // TODO: Use appropriate sensor driver
    if ( STATE_CLOSED == getFPGADoorState() )
    {
        state = NO_CART_SELF_TESTS_OCCLUSION_SENSORS_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestLeakDetectorsState function verifies leak detectors status.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestLeakDetectorsState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_LEAK_DETECTORS_STATE;
    // TODO: Use appropriate sensor driver
    BOOL const bloodLeakDetector = getFPGABloodLeakDetectorStatus();

    if ( TRUE == bloodLeakDetector )
    {
        // TODO: Use appropriate sensor driver
        setFPGASensorTest( BLOOD_LEAK_NORMAL_OPERATION );
        state = NO_CART_SELF_TESTS_BOARD_TEMPERATURE_STATE;
    }
    else
    {
        SET_ALARM_WITH_1_U32_DATA( ALARM_ID_HD_BLOOD_LEAK_SELF_TEST_FAILURE, (U32)bloodLeakDetector );
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestHomeValvesState function starts homing process for
 * all the valves.
 * @details Inputs: none
 * @details Outputs: Home all valves
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeValvesState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_HOME_SYRINGE_PUMP_STATE;
    VALVE_T valve;

    for ( valve = VDI; valve < NUM_OF_VALVES; ++valve )
    {
        homeValve( valve );
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestHomeSyringePumpState function homes syringe pump.
 * @details Inputs: useHeparin
 * @details Outputs: Home syringe pump
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeSyringePumpState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_HOME_SYRINGE_PUMP_STATE;

    if ( TRUE == useHeparin )
    {
        if ( ( FALSE == isSyringePumpHome() ) && ( TRUE == isSyringePumpStopped() ) )
        {
            retractSyringePump();
        }
    }

    if ( TRUE == isSyringePumpHome() )
    {
        state = NO_CART_SELF_TESTS_PUMPS_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestPumpsState function runs blood, dialysate inlet,
 * dialysate outlet pumps for certain time to make sure no alarms occur.
 * @details Inputs: none
 * @details Outputs: Ran self-test for blood, dialysate in, dialysate out pumps
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestPumpsState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_PUMPS_STATE;

    if ( FALSE == havePumpsStarted )
    {
        havePumpsStarted = TRUE;

        setBloodPumpTargetFlowRate( PUMP_SELF_TEST_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
        setDialInPumpTargetFlowRate( PUMP_SELF_TEST_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
        setDialOutPumpTargetRate( PUMP_SELF_TEST_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
        runPumpStartTime = getMSTimerCount();
    }

    if ( TRUE == didTimeout( runPumpStartTime, PUMP_RUN_SELF_TEST_TIME_MS ) )
    {
        signalBloodPumpHardStop();
        signalDialInPumpHardStop();
        signalDialOutPumpHardStop();

        // Home pumps for cartridge installation
        homeBloodPump();
        homeDialInPump();
        homeDialOutPump();
        state = NO_CART_SELF_TESTS_HOME_IDLE_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestHomeIdleState function waits for all pumps finish homing.
 * @details Inputs: none
 * @details Outputs: All pumps finished homing
 * @return the next state of no cartridge self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestHomeIdleState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_HOME_IDLE_STATE;

    if ( ( FALSE == isDialInPumpRunning() ) && ( FALSE == isDialOutPumpRunning() ) && ( FALSE == isBloodPumpRunning() ) )
    {
        state = NO_CART_SELF_TESTS_COMPLETE_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        setupForSelfTestsStop();
        state = NO_CART_SELF_TESTS_STOPPED_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleNoCartSelfTestStoppedState function handles the stopped no
 * cartridge self-tests operation.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of no cart self-tests state machine
 *************************************************************************/
static NO_CART_SELF_TESTS_STATE_T handleNoCartSelfTestStoppedState( void )
{
    NO_CART_SELF_TESTS_STATE_T state = NO_CART_SELF_TESTS_STOPPED_STATE;

    if ( TRUE == selfTestsResumeRequested )
    {
        selfTestsResumeRequested = FALSE;
        havePumpsStarted = FALSE;
        state = NO_CART_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestWaitForDoorCloseState function makes sure door is
 * closed before starting self-tests.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestWaitForDoorCloseState( void )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;

    // TODO: Use appropriate sensor driver
    if ( STATE_CLOSED == getFPGADoorState() )
    {
        state = DRY_SELF_TESTS_USED_CARTRIDGE_CHECK_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestUsedCartridgeCheckState function verify no fluid is
 * detected by bubble detectors to ensure the cartridge is new.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestUsedCartridgeCheckState( void )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_USED_CARTRIDGE_CHECK_STATE;

    // TODO: Use appropriate sensor driver
    BOOL const isADADetectedAir = getFPGAArterialAirBubbleStatus();
    BOOL const isADVDetectedAir = getFPGAVenousAirBubbleStatus();

    if ( ( TRUE == isADADetectedAir ) && ( TRUE == isADVDetectedAir ) &&
         ( AIR_TRAP_LEVEL_AIR == getAirTrapLevel( AIR_TRAP_LEVEL_SENSOR_LOWER ) ) &&
         ( AIR_TRAP_LEVEL_AIR == getAirTrapLevel( AIR_TRAP_LEVEL_SENSOR_UPPER ) ) )
    {
        state = DRY_SELF_TESTS_OCCLUSION_SENSORS_STATE;
    }
    else
    {
        activateAlarmNoData( ALARM_ID_INSTALL_NEW_CARTRIDGE );
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestPressureSensorsSetupState function handles the setup
 * for pressure sensors dry self-test.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsSetupState( void )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_PRESSURE_SENSORS_STATE;

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }
    else
    {
        previousNormalArterialPressure = getMeasuredArterialPressure();
        previousNormalVenousPressure = getMeasuredVenousPressure();

        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
        setValvePosition( VDO, VALVE_POSITION_C_CLOSE );
        setValvePosition( VBA, VALVE_POSITION_B_OPEN );
        setValvePosition( VBV, VALVE_POSITION_C_CLOSE );
        setValveAirTrap( STATE_CLOSED );
        setBloodPumpTargetFlowRate( PUMP_SELF_TEST_FLOW_RATE_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
        pressureSelfTestBloodPumpRunStartTime = getMSTimerCount();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestPressureSensorsState function tests the readings of
 * pressure sensors and verify they are in correct range.
 * @details Inputs: none
 * @details Outputs: none
 * @param result self-test result
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsState( SELF_TEST_STATUS_T *result )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_PRESSURE_SENSORS_STATE;
    F32 const arterialPressure = getMeasuredArterialPressure();
    F32 const venousPressure = getMeasuredVenousPressure();

    // End the test when reaching target pressure or time out
    if ( ( TRUE == didTimeout( pressureSelfTestBloodPumpRunStartTime, BLOOD_PUMP_RUN_TIME_PRESSURE_SELF_TEST ) ) ||
         ( ARTERIAL_PRESSURE_SELF_TEST_LOW_LIMIT_MMHG >= arterialPressure ) || ( VENOUS_PRESSURE_SELF_TEST_HIGH_LIMIT_MMHG <= venousPressure ) )
    {
        // Test pass when reading positive arterial pressure and negative venous pressure
        if ( ( arterialPressure < 0) && ( venousPressure > 0 ) )
        {
            signalBloodPumpHardStop();
            setValvePosition( VBV, VALVE_POSITION_B_OPEN );
            setValveAirTrap( STATE_OPEN );
            pressureSelfTestNormalizedStartTime = getMSTimerCount();
            state = DRY_SELF_TESTS_PRESSURE_SENSORS_NORMAL_STATE;
        }
        else
        {
            *result = SELF_TEST_STATUS_FAILED;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestPressureSensorsNormalState function verify the readings of
 * pressure sensors after returning to normal state.
 * @details Inputs: none
 * @details Outputs: none
 * @param result self-test result
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestPressureSensorsNormalState( SELF_TEST_STATUS_T *result )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_PRESSURE_SENSORS_NORMAL_STATE;

    F32 const arterialPressureDiff = fabs( getMeasuredArterialPressure() - previousNormalArterialPressure );
    F32 const venousPressureDiff = fabs( getMeasuredVenousPressure() - previousNormalVenousPressure );

    if ( TRUE == didTimeout( pressureSelfTestNormalizedStartTime, NORMALIZED_PRESSURE_SELF_TEST_TIME ) )
    {
        if ( ( arterialPressureDiff <= NORMAL_PRESSURE_DIFF_TOLERANCE_MMHG ) && ( venousPressureDiff <= NORMAL_PRESSURE_DIFF_TOLERANCE_MMHG ) )
        {
            state = DRY_SELF_TESTS_SYRINGE_PUMP_PRIME_STATE;
        }
        else
        {
            *result = SELF_TEST_STATUS_FAILED;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestSyringePumpPrimeState function handles the prime
 * operation for syringe pump.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestSyringePumpPrimeState( void )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_SYRINGE_PUMP_PRIME_STATE;

    if ( TRUE == useHeparin )
    {
        if ( TRUE == isSyringePlungerFound() )
        {
            if ( TRUE == isSyringePumpPrimed() )
            {
                state = DRY_SELF_TESTS_COMPLETE_STATE;
            }
            else
            {
                primeSyringePump();
            }
        }
        else
        {
            seekSyringePlunger();
        }
    }
    else
    {
        state = DRY_SELF_TESTS_COMPLETE_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = DRY_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleDrySelfTestStoppedState function handles the stopped dry self-tests
 * operation.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of dry self-tests state machine
 *************************************************************************/
static DRY_SELF_TESTS_STATE_T handleDrySelfTestStoppedState( void )
{
    DRY_SELF_TESTS_STATE_T state = DRY_SELF_TESTS_STOPPED_STATE;

    if ( TRUE == selfTestsResumeRequested )
    {
        selfTestsResumeRequested = FALSE;
#ifndef SKIP_DRY_SELF_TESTS
        state = DRY_SELF_TESTS_WAIT_FOR_DOOR_CLOSE_STATE;
#else
        state = DRY_SELF_TESTS_SYRINGE_PUMP_PRIME_STATE;
#endif
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestStartState function handles setup state for wet
 * self-tests sub-mode.
 * @details Inputs: reservoir one weight
 * @details Outputs: setup valves and dialysate inlet pump
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestStartState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_START_STATE;
    DG_CMD_RESPONSE_T cmdResp;

    F32 const resOneWeight = getReservoirWeightLargeFilter( DG_RESERVOIR_1 );
    setupDisplacementVolume = fabs( resOneWeight - WET_SELF_TEST_RESERVOIR_ONE_SETUP_VOLUME_ML );

    if ( FALSE == isValvesSettingSent )
    {
        isValvesSettingSent = TRUE;
        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
        setValvePosition( VDO, VALVE_POSITION_C_CLOSE );

        if ( resOneWeight > WET_SELF_TEST_RESERVOIR_ONE_SETUP_VOLUME_ML )
        {
            cmdChangeDGValveSetting( DG_VALVE_SETTING_R1_TO_R2 );
        }
        else
        {
            cmdChangeDGValveSetting( DG_VALVE_SETTING_R2_TO_R1 );
        }
    }

    if ( ( TRUE == isValvesSettingSent ) && ( TRUE == getDGCommandResponse( DG_CMD_VALVE_SETTING, &cmdResp ) ) )
    {
        // Re-send command if DG rejects
        isValvesSettingSent = FALSE;

        if ( FALSE == cmdResp.rejected )
        {
            setDialInPumpTargetFlowRate( DIP_FLOW_RATE_SETUP_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
            fmdIntegratedVolume = 0.0;
            state = WET_SELF_TESTS_SETUP_STATE;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestSetupState function setup reservoir one before
 * the start of wet self-tests.
 * @details Inputs: dialysate inlet flow rate
 * @details Outputs: stop dialysate inlet pump
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestSetupState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_SETUP_STATE;

    setupDisplacementVolume -= ( SELF_TEST_FLOW_INTEGRATOR * getMeasuredDialInFlowRate() );

    if ( setupDisplacementVolume <= 0 )
    {
        signalDialInPumpHardStop();
        state = WET_SELF_TESTS_PRIME_CHECK_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestPrimeCheckState function checks arterial and venous
 * lines to make sure they are primed.
 * @details Inputs: Arterial and venous bubble detectors status
 * @details Outputs: Test pass/fail
 * @param result self-test result
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestPrimeCheckState( SELF_TEST_STATUS_T *result )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_PRIME_CHECK_STATE;
    *result = SELF_TEST_STATUS_FAILED;

    // TODO: Use appropriate sensor driver
    BOOL const isADADetectedAir = getFPGAArterialAirBubbleStatus();
    BOOL const isADVDetectedAir = getFPGAVenousAirBubbleStatus();

#ifndef SKIP_AIR_BUBBLE_CHECK
    if ( ( FALSE == isADADetectedAir ) && ( FALSE == isADVDetectedAir ) )
#endif
    {
        settleStartTime = getMSTimerCount();
        state = WET_SELF_TESTS_FIRST_DISPLACEMENT_SETUP_STATE;
        *result = SELF_TEST_STATUS_PASSED;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestStartFirstDisplacementState function setups the valves
 * and pumps to start first dialysate displacement.
 * @details Inputs: settleStartTime
 * @details Outputs: setup valves and pump, reservoirVolume[]
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementSetupState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_FIRST_DISPLACEMENT_SETUP_STATE;
    DG_CMD_RESPONSE_T cmdResp;

    if ( ( FALSE == isValvesSettingSent ) && ( TRUE == didTimeout( settleStartTime, RESERVOIR_SETTLE_TIME_MS ) ) )
    {
        reservoirVolume[ DG_RESERVOIR_1 ] = getReservoirWeightLargeFilter( DG_RESERVOIR_1 );
        reservoirVolume[ DG_RESERVOIR_2 ] = getReservoirWeightLargeFilter( DG_RESERVOIR_2 );

        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
        setValvePosition( VDO, VALVE_POSITION_C_CLOSE );
        cmdChangeDGValveSetting( DG_VALVE_SETTING_R1_TO_R2 );
        isValvesSettingSent = TRUE;
    }

    if ( ( TRUE == isValvesSettingSent ) && ( TRUE == getDGCommandResponse( DG_CMD_VALVE_SETTING, &cmdResp ) ) )
    {
        // Re-send command if DG rejects
        isValvesSettingSent = FALSE;

        if ( FALSE == cmdResp.rejected )
        {
            setDialInPumpTargetFlowRate( DIP_FLOW_RATE_FIRST_DISPLACEMENT_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
            displacementStartTime = getMSTimerCount();
            fmdIntegratedVolume = 0.0;
            state = WET_SELF_TESTS_FIRST_DISPLACEMENT_STATE;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestFirstDisplacementState function handles the first
 * dialysate displacement from reservoir 1 to reservoir 2.
 * @details Inputs: firstDisplacementStartTime, measured dialysate flow rate
 * @details Outputs: integrated volume
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_FIRST_DISPLACEMENT_STATE;

    fmdIntegratedVolume += getMeasuredDialInFlowRate();

    if ( TRUE == didTimeout( displacementStartTime, WET_SELF_TEST_DISPLACEMENT_TIME_MS ) )
    {
        signalDialInPumpHardStop();
        fmdIntegratedVolume = ( ( fmdIntegratedVolume * TASK_GENERAL_INTERVAL ) / ( SEC_PER_MIN * MS_PER_SECOND ) );

        settleStartTime = getMSTimerCount();
        state = WET_SELF_TESTS_FIRST_DISPLACEMENT_VERIFY_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestFirstDisplacementVerifyState function checks the load cell
 * readings and FMD integrated volume after the first dialysate displacement.
 * @details Inputs: settleStartTime, reservoirVolume[], reservoirs' weights
 * @details Outputs: verify correctness of dialysate flow meter and load cell
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestFirstDisplacementVerifyState( SELF_TEST_STATUS_T *result )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_FIRST_DISPLACEMENT_VERIFY_STATE;

    if ( TRUE == didTimeout( settleStartTime, RESERVOIR_SETTLE_TIME_MS ) )
    {
        F32 const resOneDiffAfterDisplacement = reservoirVolume[ DG_RESERVOIR_1 ] - getReservoirWeightLargeFilter( DG_RESERVOIR_1 );
        F32 const resTwoDiffAfterDisplacement = getReservoirWeightLargeFilter( DG_RESERVOIR_2 ) - reservoirVolume[ DG_RESERVOIR_2 ];
        F32 const integratedVolumeToTargetPercent = fabs( 1.0 - ( fmdIntegratedVolume / WET_SELF_TEST_FIRST_DISPLACEMENT_TARGET_VOLUME_ML ) );

        if ( ( fabs( resOneDiffAfterDisplacement - resTwoDiffAfterDisplacement) <= WET_SELF_TEST_DISPLACEMENT_TOLERANCE_G ) &&
             ( integratedVolumeToTargetPercent <= WET_SELF_TEST_INTEGRATED_VOLUME_TOLERANCE ) )
        {
            state = WET_SELF_TESTS_SECOND_DISPLACEMENT_SETUP_STATE;
        }
        else
        {
            *result = SELF_TEST_STATUS_FAILED;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestSecondDisplacementSetupState function setups the valves
 * and pumps to start second dialysate displacement.
 * @details Inputs: settleStartTime
 * @details Outputs: setup valves and pump, reservoirVolume[]
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementSetupState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_SECOND_DISPLACEMENT_SETUP_STATE;
    DG_CMD_RESPONSE_T cmdResp;

    if ( FALSE == isValvesSettingSent )
    {
        reservoirVolume[ DG_RESERVOIR_1 ] = getReservoirWeightLargeFilter( DG_RESERVOIR_1 );
        reservoirVolume[ DG_RESERVOIR_2 ] = getReservoirWeightLargeFilter( DG_RESERVOIR_2 );

        setValvePosition( VDI, VALVE_POSITION_C_CLOSE );
        setValvePosition( VDO, VALVE_POSITION_C_CLOSE );
        cmdChangeDGValveSetting( DG_VALVE_SETTING_R1_TO_R2 );
        isValvesSettingSent = TRUE;
    }

    if ( ( TRUE == isValvesSettingSent ) && ( TRUE == getDGCommandResponse( DG_CMD_VALVE_SETTING, &cmdResp ) ) )
    {
        // Re-send command if DG rejects
        isValvesSettingSent = FALSE;

        if ( FALSE == cmdResp.rejected )
        {
            setDialInPumpTargetFlowRate( DIP_FLOW_RATE_SECOND_DISPLACEMENT_ML_MIN, MOTOR_DIR_FORWARD, PUMP_CONTROL_MODE_OPEN_LOOP );
            displacementStartTime = getMSTimerCount();
            fmdIntegratedVolume = 0.0;
            state = WET_SELF_TESTS_SECOND_DISPLACEMENT_STATE;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestSecondDisplacementState function handles the first
 * dialysate displacement from reservoir 2 to reservoir 1.
 * @details Inputs: firstDisplacementStartTime, measured dialysate flow rate
 * @details Outputs: integrated volume
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_SECOND_DISPLACEMENT_STATE;

    fmdIntegratedVolume += getMeasuredDialInFlowRate();

    if ( TRUE == didTimeout( displacementStartTime, WET_SELF_TEST_DISPLACEMENT_TIME_MS ) )
    {
        signalDialInPumpHardStop();
        // Convert flow into volume for period of general task interval
        fmdIntegratedVolume = ( ( fmdIntegratedVolume * TASK_GENERAL_INTERVAL ) / ( SEC_PER_MIN * MS_PER_SECOND ) );

        settleStartTime = getMSTimerCount();
        state = WET_SELF_TESTS_SECOND_DISPLACEMENT_VERIFY_STATE;
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestSecondDisplacementVerifyState function checks the load cell
 * readings and FMD integrated volume after the second dialysate displacement.
 * @details Inputs: settleStartTime, reservoirVolume[], reservoirs' weights
 * @details Outputs: verify correctness of dialysate flow meter and load cell
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestSecondDisplacementVerifyState( SELF_TEST_STATUS_T *result )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_SECOND_DISPLACEMENT_VERIFY_STATE;

    if ( TRUE == didTimeout( settleStartTime, RESERVOIR_SETTLE_TIME_MS ) )
    {
        F32 const resOneDiffAfterDisplacement = getReservoirWeightLargeFilter( DG_RESERVOIR_1 ) - reservoirVolume[ DG_RESERVOIR_1 ];
        F32 const resTwoDiffAfterDisplacement = reservoirVolume[ DG_RESERVOIR_2 ]  - getReservoirWeightLargeFilter( DG_RESERVOIR_2 );
        F32 const integratedVolumeToTargetPercent = fabs( 1.0 - ( fmdIntegratedVolume / WET_SELF_TEST_SECOND_DISPLACEMENT_TARGET_VOLUME_ML ) );

        if ( ( fabs( resOneDiffAfterDisplacement - resTwoDiffAfterDisplacement) <= WET_SELF_TEST_DISPLACEMENT_TOLERANCE_G ) &&
             ( integratedVolumeToTargetPercent <= WET_SELF_TEST_INTEGRATED_VOLUME_TOLERANCE ) )
        {
            state = WET_SELF_TESTS_COMPLETE_STATE;
        }
        else
        {
            *result = SELF_TEST_STATUS_FAILED;
        }
    }

    if ( TRUE == doesAlarmStatusIndicateStop() )
    {
        state = WET_SELF_TESTS_STOPPED_STATE;
        setupForSelfTestsStop();
    }

    return state;
}

/*********************************************************************//**
 * @brief
 * The handleWetSelfTestStoppedState function handles the stopped wet self-tests
 * operation.
 * @details Inputs: none
 * @details Outputs: none
 * @return the next state of wet self-tests state machine
 *************************************************************************/
static WET_SELF_TESTS_STATE_T handleWetSelfTestStoppedState( void )
{
    WET_SELF_TESTS_STATE_T state = WET_SELF_TESTS_STOPPED_STATE;

    if ( TRUE == selfTestsResumeRequested )
    {
        selfTestsResumeRequested = FALSE;
        state = WET_SELF_TESTS_START_STATE;
    }

    return state;
}

/**@}*/