(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *)

{$INCLUDE "options.inc"}

unit uGearsHedgehog;

interface

uses uTypes, uGearsHandlersMess;

procedure doStepHedgehog(Gear: PGear);

procedure AfterAttack;

procedure HedgehogStep(Gear: PGear);

procedure doStepHedgehogMoving(Gear: PGear);

procedure HedgehogChAngle(HHGear: PGear);

procedure PickUp(HH, Gear: PGear);

procedure AddPickup(HH: THedgehog; ammo: TAmmoType; cnt, X, Y: LongWord);

procedure CheckIce(Gear: PGear); inline;

implementation

uses uConsts, uVariables, uFloat, uAmmos, uSound, uCaptions,

    uCommands, uLocale, uUtils, uStats, uIO, uScript,

    uGearsList, uCollisions, uRandom, uStore, uTeams,

    uGearsUtils, uVisualGearsList, uChat;

var GHStepTicks: LongWord = 0;

procedure AFKSkip;

var

    t: byte;

begin

    t:= 0;

    while (TeamsArray[t] <> CurrentTeam) do inc(t);

    SendHogSpeech(#1 + char(t) + 'AFK');

    ParseCommand('/skip', true)

end;

// Shouldn't more of this ammo switching stuff be moved to uAmmos ?

function ChangeAmmo(HHGear: PGear): boolean;

var slot, i: Longword;

    ammoidx: LongInt;

    prevAmmo: TAmmoType;

begin

ChangeAmmo:= false;

slot:= HHGear^.MsgParam;

with HHGear^.Hedgehog^ do

    begin

    HHGear^.Message:= HHGear^.Message and (not gmSlot);

    prevAmmo:= CurAmmoType;

    ammoidx:= 0;

    if (((HHGear^.State and (gstAttacking or gstAttacked)) <> 0) and (GameFlags and gfInfAttack = 0))

    or ((HHGear^.State and gstHHDriven) = 0) then

        exit;

    ChangeAmmo:= true;

    while (ammoidx < cMaxSlotAmmoIndex) and (Ammo^[slot, ammoidx].AmmoType <> CurAmmoType) do

        inc(ammoidx);

    if (MultiShootAttacks > 0) then

        begin

        if (CurAmmoType = amSniperRifle) and ((GameFlags and gfArtillery) = 0) then

            cArtillery := false;

        if (Ammoz[CurAmmoType].Ammo.Propz and ammoprop_NoRoundEnd) = 0 then

            begin

            MultiShootAttacks:= Ammoz[CurAmmoType].Ammo.NumPerTurn;

            AfterAttack

            end

        else OnUsedAmmo(HHGear^.Hedgehog^)

        end;

    MultiShootAttacks:= 0;

    HHGear^.Message:= HHGear^.Message and (not (gmLJump or gmHJump));

    if Ammoz[CurAmmoType].Slot = slot then

        begin

        i:= 0;

        repeat

        inc(ammoidx);

        if (ammoidx > cMaxSlotAmmoIndex) then

            begin

            inc(i);

            CurAmmoType:= amNothing;

            ammoidx:= -1;

            //TryDo(i < 2, 'Engine bug: no ammo in current slot', true)

            end;

        until (i = 1) or ((Ammo^[slot, ammoidx].Count > 0)

        and (Team^.Clan^.TurnNumber > Ammoz[Ammo^[slot, ammoidx].AmmoType].SkipTurns))

        end

    else

        begin

        i:= 0;

        // check whether there is ammo in slot

        while (i <= cMaxSlotAmmoIndex) and ((Ammo^[slot, i].Count = 0)

        or (Team^.Clan^.TurnNumber <= Ammoz[Ammo^[slot, i].AmmoType].SkipTurns))

            do inc(i);

        if i <= cMaxSlotAmmoIndex then

            ammoidx:= i

        else ammoidx:= -1

        end;

        if ammoidx >= 0 then

            CurAmmoType:= Ammo^[slot, ammoidx].AmmoType;

    if (prevAmmo <> CurAmmoType) then

        begin

        if CurAmmoType = amKnife then

            LoadHedgehogHat(HHGear^.Hedgehog^, 'Reserved/chef')

        else if prevAmmo = amKnife then

            LoadHedgehogHat(HHGear^.Hedgehog^, Hat);

        end;

    // Try again in the next slot

    if (CurAmmoType = prevAmmo) and (slot < cMaxSlotIndex) then

        begin

        inc(slot);

        HHGear^.MsgParam:= slot;

        ChangeAmmo(HHGear)

        end

    end

end;

procedure HHSetWeapon(HHGear: PGear);

var t: LongInt;

    weap: TAmmoType;

    Hedgehog: PHedgehog;

    s: boolean;

    prevState, newState: LongWord;

begin

s:= false;

weap:= TAmmoType(HHGear^.MsgParam);

Hedgehog:= HHGear^.Hedgehog;

if Hedgehog^.Team^.Clan^.TurnNumber <= Ammoz[weap].SkipTurns then

    exit; // weapon is not activated yet

HHGear^.MsgParam:= Ammoz[weap].Slot;

t:= cMaxSlotAmmoIndex;

HHGear^.Message:= HHGear^.Message and (not gmWeapon);

prevState:= HHGear^.State;

newState:= prevState;

with Hedgehog^ do

    while (CurAmmoType <> weap) and (t >= 0) do

        begin

        s:= ChangeAmmo(HHGear);

        if HHGear^.State <> prevState then // so we can keep gstAttacked out of consideration when looping

            newState:= HHGear^.State;

        HHGear^.State:= prevState;

        dec(t)

        end;

HHGear^.State:= newState;

if s then

    ApplyAmmoChanges(HHGear^.Hedgehog^)

end;

procedure HHSetTimer(Gear: PGear);

var CurWeapon: PAmmo;

    color: LongWord;

begin

Gear^.Message:= Gear^.Message and (not gmTimer);

CurWeapon:= GetCurAmmoEntry(Gear^.Hedgehog^);

with Gear^.Hedgehog^ do

    if ((Gear^.Message and gmPrecise) <> 0) and ((CurWeapon^.Propz and ammoprop_SetBounce) <> 0) then

        begin

        color:= Gear^.Hedgehog^.Team^.Clan^.Color;

        case Gear^.MsgParam of

            1: begin

               AddCaption(FormatA(trmsg[sidBounce], trmsg[sidBounce1]), color, capgrpAmmostate);

               CurWeapon^.Bounciness:= 350;

               end;

            2: begin

               AddCaption(FormatA(trmsg[sidBounce], trmsg[sidBounce2]), color, capgrpAmmostate);

               CurWeapon^.Bounciness:= 700;

               end;

            3: begin

               AddCaption(FormatA(trmsg[sidBounce], trmsg[sidBounce3]), color, capgrpAmmostate);

               CurWeapon^.Bounciness:= 1000;

               end;

            4: begin

               AddCaption(FormatA(trmsg[sidBounce], trmsg[sidBounce4]), color, capgrpAmmostate);

               CurWeapon^.Bounciness:= 2000;

               end;

            5: begin

               AddCaption(FormatA(trmsg[sidBounce], trmsg[sidBounce5]), color, capgrpAmmostate);

               CurWeapon^.Bounciness:= 4000;

               end

            end

        end

    else if (CurWeapon^.Propz and ammoprop_Timerable) <> 0 then

        begin

        CurWeapon^.Timer:= 1000 * Gear^.MsgParam;

        with CurrentTeam^ do

            ApplyAmmoChanges(Hedgehogs[CurrHedgehog]);

        end;

end;

procedure Attack(Gear: PGear);

var xx, yy, newDx, newDy, lx, ly: hwFloat;

    speech: PVisualGear;

    newGear:  PGear;

    CurWeapon: PAmmo;

    altUse: boolean;

    elastic: hwFloat;

begin

newGear:= nil;

bShowFinger:= false;

CurWeapon:= GetCurAmmoEntry(Gear^.Hedgehog^);

with Gear^,

    Gear^.Hedgehog^ do

        begin

        if ((State and gstHHDriven) <> 0) and ((State and (gstAttacked or gstHHChooseTarget)) = 0) and (((State and gstMoving) = 0)

        or (Power > 0)

        or (CurAmmoType = amTeleport)

        or

        // Allow attacks while moving on ammo with AltAttack

        ((CurAmmoGear <> nil) and ((Ammoz[CurAmmoGear^.AmmoType].Ammo.Propz and ammoprop_AltAttack) <> 0))

        or ((Ammoz[CurAmmoType].Ammo.Propz and ammoprop_AttackInMove) <> 0))

        and ((TargetPoint.X <> NoPointX) or ((Ammoz[CurAmmoType].Ammo.Propz and ammoprop_NeedTarget) = 0)) then

            begin

            State:= State or gstAttacking;

            if (Power = cMaxPower) or ((Ammoz[CurAmmoType].Ammo.Propz and ammoprop_Power) = 0) then

                Message:= Message and (not gmAttack)

            else

                begin

                if Power = 0 then

                    begin

                    AttackBar:= CurrentTeam^.AttackBar;

                    PlaySound(sndThrowPowerUp)

                    end;

                inc(Power)

                end;

            if ((Message and gmAttack) <> 0) then

                exit;

            if (Ammoz[CurAmmoType].Ammo.Propz and ammoprop_Power) <> 0 then

                begin

                StopSound(sndThrowPowerUp);

                PlaySound(sndThrowRelease);

                end;

            xx:= SignAs(AngleSin(Angle), dX);

            yy:= -AngleCos(Angle);

            lx:= X + int2hwfloat(round(GetLaunchX(CurAmmoType, hwSign(dX), Angle)));

            ly:= Y + int2hwfloat(round(GetLaunchY(CurAmmoType, Angle)));

            if ((Gear^.State and gstHHHJump) <> 0) and (not cArtillery) then

                xx:= - xx;

            if Ammoz[CurAmmoType].Ammo.AttackVoice <> sndNone then

                AddVoice(Ammoz[CurAmmoType].Ammo.AttackVoice, CurrentTeam^.voicepack);

// Initiating alt attack

            if  (CurAmmoGear <> nil)

            and ((Ammoz[CurAmmoGear^.AmmoType].Ammo.Propz and ammoprop_AltAttack) <> 0)

            and ((Gear^.Message and gmLJump) <> 0)

            and ((Ammoz[CurAmmoType].Ammo.Propz and ammoprop_AltUse) <> 0) then

                begin

                if (CurAmmoGear^.AmmoType = amJetpack) and (Gear^.Message and gmPrecise <> 0) then

                    begin

                    newDx:= xx*cMaxPower/cPowerDivisor;

                    newDy:= yy*cMaxPower/cPowerDivisor

                    end

                else

                    begin

                    newDx:= dX;

                    newDy:= dY

                    end;

                altUse:= true

                end

            else

                begin

                newDx:= xx*Power/cPowerDivisor;

                newDy:= yy*Power/cPowerDivisor;

                altUse:= false

                end;

            case CurAmmoType of

                      amGrenade: newGear:= AddGear(hwRound(lx), hwRound(ly), gtGrenade,         0, newDx, newDy, CurWeapon^.Timer);

                      amMolotov: newGear:= AddGear(hwRound(lx), hwRound(ly), gtMolotov,      0, newDx, newDy, 0);

                  amClusterBomb: newGear:= AddGear(hwRound(lx), hwRound(ly), gtClusterBomb,  0, newDx, newDy, CurWeapon^.Timer);

                      amGasBomb: newGear:= AddGear(hwRound(lx), hwRound(ly), gtGasBomb,      0, newDx, newDy, CurWeapon^.Timer);

                      amBazooka: newGear:= AddGear(hwRound(lx), hwRound(ly), gtShell,        0, newDx, newDy, 0);

                     amSnowball: newGear:= AddGear(hwRound(lx), hwRound(ly), gtSnowball,     0, newDx, newDy, 0);

                          amBee: newGear:= AddGear(hwRound(lx), hwRound(ly), gtBee,          0, newDx, newDy, 0);

                      amShotgun: begin

                                 PlaySound(sndShotgunReload);

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtShotgunShot,  0, xx * _0_5, yy * _0_5, 0);

                                 end;

                   amPickHammer: newGear:= AddGear(hwRound(lx), hwRound(ly) + cHHRadius, gtPickHammer, 0, _0, _0, 0);

                         amSkip: ParseCommand('/skip', true);

                         amRope: newGear:= AddGear(hwRound(lx), hwRound(ly), gtRope, 0, xx, yy, 0);

                         amMine: newGear:= AddGear(hwRound(lx) + hwSign(dX) * 7, hwRound(ly), gtMine, gstWait, SignAs(_0_02, dX), _0, 3000);

                        amSMine: newGear:= AddGear(hwRound(lx), hwRound(ly), gtSMine,    0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                        amKnife: begin

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtKnife,    0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                                 newGear^.State:= newGear^.State or gstMoving;

                                 newGear^.Radius:= 4 // temporarily shrink so it doesn't instantly embed in the ground

                                 end;

                       amDEagle: newGear:= AddGear(hwRound(lx + xx * cHHRadius), hwRound(ly + yy * cHHRadius), gtDEagleShot, 0, xx * _0_5, yy * _0_5, 0);

                      amSineGun: newGear:= AddGear(hwRound(lx + xx * cHHRadius), hwRound(ly + yy * cHHRadius), gtSineGunShot, 0, xx * _0_5, yy * _0_5, 0);

                    amPortalGun: begin

                                 newGear:= AddGear(hwRound(lx + xx * cHHRadius), hwRound(ly + yy * cHHRadius), gtPortal, 0, xx * _0_6, yy * _0_6,

                                 // set selected color

                                 CurWeapon^.Pos);

                                 end;

                  amSniperRifle: begin

                                 PlaySound(sndSniperReload);

                                 newGear:= AddGear(hwRound(lx + xx * cHHRadius), hwRound(ly + yy * cHHRadius), gtSniperRifleShot, 0, xx * _0_5, yy * _0_5, 0);

                                 end;

                     amDynamite: newGear:= AddGear(hwRound(lx) + hwSign(dX) * 7, hwRound(ly), gtDynamite, 0, SignAs(_0_03, dX), _0, 5000);

                    amFirePunch: newGear:= AddGear(hwRound(lx) + hwSign(dX) * 10, hwRound(ly), gtFirePunch, 0, xx, _0, 0);

                         amWhip: begin

                                 newGear:= AddGear(hwRound(lx) + hwSign(dX) * 10, hwRound(ly), gtWhip, 0, SignAs(_1, dX), - _0_8, 0);

                                 PlaySound(sndWhipCrack)

                                 end;

                       amHammer: begin

                                 newGear:= AddGear(hwRound(lx) + hwSign(dX) * 10, hwRound(ly), gtHammer, 0, SignAs(_1, dX), - _0_8, 0);

                                 PlaySound(sndWhack)

                                 end;

                  amBaseballBat: begin

                                 newGear:= AddGear(hwRound(lx) + hwSign(dX) * 10, hwRound(ly), gtShover, gsttmpFlag, xx * _0_5, yy * _0_5, 0);

                                 PlaySound(sndBaseballBat) // TODO: Only play if something is hit?

                                 end;

                    amParachute: begin

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtParachute, 0, _0, _0, 0);

                                 PlaySound(sndParachute)

                                 end;

                    // we save CurWeapon^.Pos (in this case: cursor direction) by using it as (otherwise irrelevant) X value of the new gear.

                    amAirAttack: newGear:= AddGear(CurWeapon^.Pos, 0, gtAirAttack, 0, _0, _0, 0);

                   amMineStrike: newGear:= AddGear(CurWeapon^.Pos, 0, gtAirAttack, 1, _0, _0, 0);

                  amDrillStrike: newGear:= AddGear(CurWeapon^.Pos, 0, gtAirAttack, 3, _0, _0, CurWeapon^.Timer);

                       amNapalm: newGear:= AddGear(CurWeapon^.Pos, 0, gtAirAttack, 2, _0, _0, 0);

                    amBlowTorch: newGear:= AddGear(hwRound(lx), hwRound(ly), gtBlowTorch, 0, SignAs(_0_5, dX), _0, 0);

                       amGirder: newGear:= AddGear(0, 0, gtGirder, CurWeapon^.Pos, _0, _0, 0);

                       amRubber: begin

                                 newGear:= AddGear(0, 0, gtGirder, CurWeapon^.Pos, _0, _0, 0);

                                 newGear^.AmmoType:= amRubber

                                 end;

                     amTeleport: newGear:= AddGear(CurWeapon^.Pos, 0, gtTeleport, 0, _0, _0, 0);

                       amSwitch: newGear:= AddGear(hwRound(lx), hwRound(ly), gtSwitcher, 0, _0, _0, 0);

                       amMortar: begin

                                 playSound(sndMortar);

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtMortar,  0, xx*cMaxPower/cPowerDivisor, yy*cMaxPower/cPowerDivisor, 0);

                                 end;

                      amRCPlane: begin

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtRCPlane,  0, xx * cMaxPower / cPowerDivisor / 4, yy * cMaxPower / cPowerDivisor / 4, 0);

                                 newGear^.SoundChannel:= LoopSound(sndRCPlane)

                                 end;

                     amKamikaze: newGear:= AddGear(hwRound(lx), hwRound(ly), gtKamikaze, 0, xx * _0_5, yy * _0_5, 0);

                         amCake: newGear:= AddGear(hwRound(lx) + hwSign(dX) * 3, hwRound(ly), gtCake, 0, SignAs(cLittle, xx), _0, 0);

                    amSeduction: newGear:= AddGear(hwRound(lx), hwRound(ly), gtSeduction, 0, _0, _0, 0);

                   amWatermelon: newGear:= AddGear(hwRound(lx), hwRound(ly), gtWatermelon,  0, newDx, newDy, CurWeapon^.Timer);

                  amHellishBomb: newGear:= AddGear(hwRound(lx), hwRound(ly), gtHellishBomb,    0, newDx, newDy, 0);

                        amDrill: newGear:= AddGear(hwRound(lx), hwRound(ly), gtDrill, 0, newDx, newDy, 0);

                      amBallgun: newGear:= AddGear(hwRound(X), hwRound(Y), gtBallgun,  0, xx * _0_5, yy * _0_5, 0);

                      amJetpack: newGear:= AddGear(hwRound(lx), hwRound(ly), gtJetpack, 0, _0, _0, 0);

                        amBirdy: begin

                             PlaySound(sndWhistle);

                             newGear:= AddGear(hwRound(lx), hwRound(ly) - 32, gtBirdy, 0, _0, _0, 0);

                             end;

                   amLowGravity: begin

                                 PlaySound(sndLowGravity);

                                 cGravity:= cMaxWindSpeed;

                                 cGravityf:= 0.00025

                                 end;

                  amExtraDamage: begin

                                 PlaySound(sndHellishImpact4);

                                 cDamageModifier:= _1_5

                                 end;

                 amInvulnerable: Effects[heInvulnerable]:= 1;

                    amExtraTime: begin

                                 PlaySound(sndSwitchHog);

                                 TurnTimeLeft:= TurnTimeLeft + 30000

                                 end;

                   amLaserSight: cLaserSighting:= true;

                     amVampiric: begin

                                 PlaySoundV(sndOw1, Team^.voicepack);

                                 cVampiric:= true;

                                 end;

                        amPiano: begin

                                 // Tuck the hedgehog away until the piano attack is completed

                                 Unplaced:= true;

                                 X:= _0;

                                 Y:= _0;

                                 newGear:= AddGear(TargetPoint.X, -1024, gtPiano, 0, _0, _0, 0);

                                 PauseMusic

                                 end;

                 amFlamethrower: newGear:= AddGear(hwRound(X), hwRound(Y), gtFlamethrower,  0, xx * _0_5, yy * _0_5, 0);

                      amLandGun: newGear:= AddGear(hwRound(X), hwRound(Y), gtLandGun,  0, xx * _0_5, yy * _0_5, 0);

                  amResurrector: begin

                                 newGear:= AddGear(hwRound(lx), hwRound(ly), gtResurrector, 0, _0, _0, 0);

                                 newGear^.SoundChannel := LoopSound(sndResurrector);

                                 end;

                    //amStructure: newGear:= AddGear(hwRound(lx) + hwSign(dX) * 7, hwRound(ly), gtStructure, gstWait, SignAs(_0_02, dX), _0, 3000);

                       amTardis: newGear:= AddGear(hwRound(X), hwRound(Y), gtTardis, 0, _0, _0, 0);

                       amIceGun: newGear:= AddGear(hwRound(X), hwRound(Y), gtIceGun, 0, _0, _0, 0);

            end;

            if altUse and (newGear <> nil) and

               ((CurAmmoGear = nil) or (CurAmmoGear^.AmmoType <> amJetpack) or (Gear^.Message and gmPrecise = 0)) then

               begin

               newGear^.dX:= newDx / newGear^.Density;

               newGear^.dY:= newDY / newGear^.Density

               end;

            if (CurAmmoGear <> nil) and (CurAmmoGear^.AmmoType = amJetpack) and

               (Gear^.Message and gmPrecise <> 0) and (hwRound(Y) > cWaterLine) then

                newGear^.State:= newGear^.State or gstSubmersible;

            case CurAmmoType of

                     amGrenade, amMolotov,

                 amClusterBomb, amGasBomb,

                     amBazooka, amSnowball,

                         amBee, amSMine,

                      amMortar, amWatermelon,

                 amHellishBomb, amDrill: FollowGear:= newGear;

                     amShotgun, amPickHammer,

                        amRope, amDEagle,

                     amSineGun, amSniperRifle,

                   amFirePunch, amWhip,

                      amHammer, amBaseballBat,

                   amParachute, amBlowTorch,

                      amGirder, amTeleport,

                      amSwitch, amRCPlane,

                    amKamikaze, amCake,

                   amSeduction, amBallgun,

                     amJetpack, amBirdy,

                amFlamethrower, amLandGun,

                 amResurrector, //amStructure,

                      amTardis, amPiano,

                      amIceGun, amRubber: CurAmmoGear:= newGear;

            end;

            if ((CurAmmoType = amMine) or (CurAmmoType = amSMine)) and (GameFlags and gfInfAttack <> 0) then

                newGear^.FlightTime:= GameTicks + 1000

            else if CurAmmoType = amDrill then

                newGear^.FlightTime:= GameTicks + 250;

            if Ammoz[CurAmmoType].Ammo.Propz and ammoprop_NeedTarget <> 0 then

                begin

                newGear^.Target.X:= TargetPoint.X;

                newGear^.Target.Y:= TargetPoint.Y

                end;

            if (newGear <> nil) and (newGear^.CollisionMask and lfCurrentHog <> 0) then newGear^.CollisionMask:= newGear^.CollisionMask and (not lfCurrentHog);

            // Clear FollowGear if using on a rope/parachute/saucer etc so focus stays with the hog's movement

            if altUse then

                FollowGear:= nil;

            if (newGear <> nil) and ((Ammoz[newGear^.AmmoType].Ammo.Propz and ammoprop_SetBounce) <> 0) then

                begin

                elastic:=  int2hwfloat(CurWeapon^.Bounciness) / _1000;

            if elastic < _1 then

                newGear^.Elasticity:= newGear^.Elasticity * elastic

            else if elastic > _1 then

                newGear^.Elasticity:= _1 - ((_1-newGear^.Elasticity) / elastic);

(* Experimented with friction modifier. Didn't seem helpful

            fric:= int2hwfloat(CurWeapon^.Bounciness) / _250;

            if fric < _1 then newGear^.Friction:= newGear^.Friction * fric

            else if fric > _1 then newGear^.Friction:= _1 - ((_1-newGear^.Friction) / fric)*)

            end;

            uStats.AmmoUsed(CurAmmoType);

            if not (SpeechText = '') then

                begin