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/**
 *    @author     ETSI / STF405
 *    @version    $URL$
 *                $Id$
 *    @desc       Module containing common functions for ITS
module LibItsCommon_Functions {

    // LibCommon
    import from LibCommon_Sync all;
    import from LibCommon_VerdictControl all;
    
    // LibIts
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    import from DENM_PDU_Descriptions language "ASN.1:1997" all; // TODO LibCommon shall be protocol independant?
    import from LibItsCommon_Pixits all;
    import from LibIts_Interface all;
    import from LibItsCommon_TypesAndValues all;
    group upperTester {
        
        /**
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         * @desc Upper tester functions
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        group utFuntions { 
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            /**
             * @desc    Requests to bring the IUT in an initial state
             * @param   p_init The initialisation to trigger.
             */
            function f_utInitializeIut(template (value) UtInitialize p_init) runs on ItsAdapterComponent {
                
                utPort.send(p_init);
                tc_wait.start;
                alt {
                    [] utPort.receive(UtResult:true) {
                        tc_wait.stop;
                        log("*** f_utInitializeIut: INFO: IUT initialized ***");
                    }
                    [] utPort.receive {
                        tc_wait.stop;
                        log("*** f_utInitializeIut: INFO: IUT could not be initialized ***");
                        f_selfOrClientSyncAndVerdict("error", e_error);
                    }
                    [] tc_wait.timeout {
                        log("*** f_utInitializeIut: INFO: IUT could not be initialized in time ***");
                        f_selfOrClientSyncAndVerdict("error", e_timeout);
                    }
                    [else] { // Shortcut defaults
                        repeat;	
                    }
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            /**
             * @desc    Triggers event from the application layer
             * @param   p_event The event to trigger.
             */
            function f_utTriggerEvent(template (value) UtEvent p_event) runs on ItsAdapterComponent {
                var template (value) UtTrigger v_utMsg := { p_event };
                
                utPort.send(v_utMsg);
                alt {
                    [] utPort.receive(UtResult:true) {
                        tc_wait.stop;
                    }
                    [] utPort.receive {
                        tc_wait.stop;
                    }
                    [] tc_wait.timeout {
                    }
                    [else] { // Shortcut defaults
                        repeat; 
                    }
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            }
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            /**
             * @desc Checks that the event was indicated at the application layer
             * @param p_event The event to check.
             * @param   p_discard The event should not appear. Default value: FALSE.
             */
            function f_utCheckEvent(template (value) UtEvent p_event, boolean p_discard) runs on ItsAdapterComponent {
                var template (value) UtCheck v_utMsg := { p_event };
                
                utPort.send(v_utMsg);
                tc_wait.start;
                alt {
                    [] utPort.receive(UtResult:true) {
                        tc_wait.stop;
                        if (p_discard == false) {
                            log("*** f_utCheckEvent: INFO: Event correctly indicated at application layer ***");
                        }
                        else {
                            log("*** f_utCheckEvent: ERROR: Event indicated at application layer where it should be discarded ***");
                            f_selfOrClientSyncAndVerdict("error", e_error);
                        }
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                    [] utPort.receive(UtResult:false) {
                        tc_wait.stop;
                        if (p_discard == false) {
                            log("*** f_utCheckEvent: ERROR: Event not correctly indicated at application layer ***");
                            f_selfOrClientSyncAndVerdict("error", e_error);
                        }
                        else {
                            log("*** f_utCheckEvent: INFO: Event not indicated at application layer***");
                        }
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                    [] tc_wait.timeout {
                        log("*** f_utCheckEvent: ERROR: Timeout while waiting for event check result ***");
                        f_selfOrClientSyncAndVerdict("error", e_timeout);                    
                    }
                    [else] { // Shortcut defaults
                        repeat; 
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            /**
             * @desc    Send a command/request request primitive and wait for the command confirm response
             * @param   p_commandReq    The command/request request
             * @param   p_commandConf   The command/request confirm response
             * @param   p_discard       Set to true if command confirm responses shall be discard, otherwise the function failed 
             * @param   p_result        The command/request confirm response
             * @verdict Unchanged on success, fail otherwise
             */
            function f_utCommandRequest(
                in template (value) UtCommandRequest p_commandReq, 
                in template (present) UtCommandConfirm p_commandConf, 
                in boolean p_discard, 
                out UtCommandConfirm p_result) 
            runs on ItsAdapterComponent {
                
                utPort.send(p_commandReq);
                tc_wait.start;
                alt {
                    [] utPort.receive(p_commandConf) -> value p_result{
                        tc_wait.stop;
                    }
                    [] utPort.receive {
                        tc_wait.stop;
                        if (p_discard == false) {
                            log("*** f_utCommandRequest: ERROR: Event not correctly indicated at application layer ***");
                            f_selfOrClientSyncAndVerdict("error", e_error);
                        }
                        else {
                            log("*** f_utCommandRequest: INFO: Another event indicated at application layer, repeating check ***");
                            repeat;
                        }
                    }
                    [] tc_wait.timeout {
                        if (p_discard == false) {
                            log("*** f_utCommandRequest: ERROR: Timeout while waiting for event check result ***");
                            f_selfOrClientSyncAndVerdict("error", e_timeout);
                        }
                        else {
                            log("*** f_utCommandRequest: INFO: Event not indicated at application layer ***");
                        }
                    }
                } // end of 'alt' statement
                
            } // End of function f_utCommandRequest
            
            /**
             * @desc Capture the next event sent to the Upper Tester
             * @param   p_event     Receive template of the expected event
             * @param   p_result    Return the value of the received event if template matchs
             */
            function f_utCommandIndication( 
                in template UtCommandIndication p_event,
                out UtCommandIndication p_result
            ) runs on ItsAdapterComponent {
                
                tc_wait.start;
                alt {
                    [] utPort.receive(p_event) -> value p_result{
                        tc_wait.stop;
                    }
                    [] utPort.receive {
                        tc_wait.stop;
                        log("*** f_utCommandIndication: INFO: Another event indicated at application layer, repeating check ***");
                    }
                    [] tc_wait.timeout {
                        log("*** f_utCommandIndication: ERROR: Timeout while waiting for event check result ***");
                    }
                } // end of 'alt' statement
                
            } // End of function f_utCommandIndication
            
        } // End of group utFunctions
        
//        /**
//         * @desc Upper tester altsteps
//         */
//        group utAltstep {
//            
//            
//            altstep a_utCommandRequest(in template UtCommandRequest p_commandReq) runs on ItsAdapterComponent { 
//                [] utPort.receive(p_commandReq) {
//                    log("*** a_utCommandRequest: INFO: Receive Command Request message ***");
//                }
//            } // End of altsetp a_utCommandRequest
//            
//        } // End of group utAltstep
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    } // End of group upper tester
        /** 
         * @desc    function to generate integer random values
         *            
         * @see        ttcn-3 - rnd()
         * @param     p_lowerbound lowest number in range
         * @param     p_upperbound highest number in range
         * @return     random integer
         *
        */
        function f_random(    in integer p_lowerbound,
                            in integer p_upperbound )
        return integer {
            //Variables
            var integer v_random := 0;
            v_random := float2int(int2float(p_upperbound - p_lowerbound +1)*rnd()) + p_lowerbound;
    
            log("*** f_random: INFO: OK - random value = " & int2str(v_random) & " ***");
        } // end function f_random
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        /**
         * @desc    Computes the absolute value of an integer 
         * @param   p_number    the number
         * @return  Absolute value of the number
         */
        function f_abs(in integer p_number) 
        return integer {
            
            if(p_number < 0) {
            	return 0 - p_number;
            }
            return p_number;	
        }

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        /**
         * @desc    Compares two values and returns the lowest onde  
         * @param   p_a     First value
         * @param   p_b     Second value
         * @return  Lowest value
         */
        function f_min(in integer p_a, in integer p_b) 
        return integer {
            
            if(p_a < p_b) {
                return p_a;
            }
            return p_b;    
        }

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        /** 
         * @desc    Removes unsignificant right-most 0 bits of a bitstring
         *            
         * @param     p_bitstring Bitstring to be reduced
         * @return    Reduced bitstring
         *
        */    
        function f_removeUnsignificantBits(in bitstring p_bitstring)
        return bitstring {
        	var integer i, len;
        	
        	len := lengthof(p_bitstring);
        	for(i:=len-1; i >=0 and p_bitstring[i] == '0'B; i:=i-1) {}
        	return substr(p_bitstring, 0, i + 1);
        } 
    
        /**
         * @desc    Gets the current time
         * @return  Timestamp - current time in Epoch format
         */
        function f_getCurrentTime() return TimeStamp {
            var TimeStamp v_timeStamp := 0;
            
            log("*** f_getCurrentTime: INFO: calling fx_getCurrentTime() ***");
            v_timeStamp := fx_getCurrentTime();
            
            return v_timeStamp;
        }
           
    } // end generalFunctions  
       
    group itsFunctions { 

        /** 
         * @desc    Gets the station identifier of test system
         * @return  Test system's station ID
         * @see     PX_TESTER_STATION_ID
         */
        function f_getTsStationId()
        return StationID {
            
            return PX_TESTER_STATION_ID;
                
        } // end f_getTsStationId
        
        /**
         * @desc    Gets the current position of test system
         * @return  Test system's position
         */
        function f_getTsCurrentPosition() return ReferencePosition {
            
            /* TODO: consider getting position from TA (as it is done for GN) */
            return PX_TS_POSITION;
            
        } // end f_getTsCurrentPosition
                
    } // end itsFunctions       
  
    group externalFunctions {
        
        /**
         * @desc    This external function gets the current time    
         * @return  Timestamp - current time in Epoch format
         */
        external function fx_getCurrentTime() return TimeStamp;
        
    } // end externalFunctions


} // end of module