(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2004-2007 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

 *)

////////////////////////////////////////////////////////////////////////////////

procedure ChangeAmmo(Gear: PGear);

var slot: Longword;

    caSlot, caAmmo: PLongword;

begin

slot:= Gear^.MsgParam;

with PHedgehog(Gear^.Hedgehog)^ do

     begin

     if ((Gear^.State and (gstAttacking or gstAttacked)) <> 0) or (AttacksNum > 0)

        or ((Gear^.State and gstHHDriven) = 0) then exit;

     Gear^.Message:= Gear^.Message and not (gm_LJump or gm_HJump or gm_Slot);

     if CurAmmoGear = nil then begin caSlot:= @CurSlot; caAmmo:= @CurAmmo end

                          else begin caSlot:= @AltSlot; caAmmo:= @AltAmmo end;

     if caSlot^ = slot then

        begin

        inc(caAmmo^);

        if (caAmmo^ > cMaxSlotAmmoIndex) or (Ammo^[slot, caAmmo^].Count = 0) then caAmmo^:= 0

        end else

     if Ammo^[slot, 0].Count > 0 then

        begin

        caSlot^:= slot;

        caAmmo^:= 0;

        end;

     end;

ApplyAmmoChanges(PHedgehog(Gear^.Hedgehog)^)

end;

procedure HHSetWeapon(Gear: PGear);

var t: LongInt;

    weap: TAmmoType;

begin

weap:= TAmmoType(Gear^.MsgParam);

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

t:= cMaxSlotAmmoIndex;

Gear^.Message:= Gear^.Message and not gm_Weapon;

with PHedgehog(Gear^.Hedgehog)^ do

     while (Ammo^[CurSlot, CurAmmo].AmmoType <> weap) and (t >= 0) do

           begin

           ChangeAmmo(Gear);

           dec(t)

           end

end;

procedure Attack(Gear: PGear);

var xx, yy: hwFloat;

begin

with Gear^,

     PHedgehog(Gear^.Hedgehog)^ do

     begin

     if ((State and gstHHDriven) <> 0)and

        ((State and (gstAttacked or gstHHChooseTarget)) = 0)and

        (((State and gstMoving) = 0)or((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_AttackInMove) <> 0))and

          ((TargetPoint.X <> NoPointX) or ((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_NeedTarget) = 0)) then

        begin

        State:= State or gstAttacking;

        if Power = cMaxPower then Message:= Message and not gm_Attack

        else if (Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) = 0 then Message:= Message and not gm_Attack

        else begin

             if Power = 0 then

                begin

                AttackBar:= CurrentTeam^.AttackBar;

                PlaySound(sndThrowPowerUp, false)

                end;

             inc(Power)

             end;

        if ((Message and gm_Attack) <> 0) then exit;

        if (Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) <> 0 then

           begin

           StopSound(sndThrowPowerUp);

           PlaySound(sndThrowRelease, false);

           end;

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

        yy:= -AngleCos(Angle); 

             case Ammo^[CurSlot, CurAmmo].AmmoType of

                      amGrenade: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtAmmo_Bomb,    0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, Ammo^[CurSlot, CurAmmo].Timer);

                  amClusterBomb: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtClusterBomb,  0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, Ammo^[CurSlot, CurAmmo].Timer);

                      amBazooka: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtAmmo_Grenade, 0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                          amUFO: FollowGear:= AddGear(hwRound(X), hwRound(Y), gtUFO,          0, xx*Power/cPowerDivisor, yy*Power/cPowerDivisor, 0);

                      amShotgun: begin

                                 PlaySound(sndShotgunReload, false);

                                 CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtShotgunShot,  0, xx * _0_5, yy * _0_5, 0);

                                 end;

                   amPickHammer: CurAmmoGear:= AddGear(hwRound(Gear^.X), hwRound(Gear^.Y) + cHHRadius, gtPickHammer, 0, _0, _0, 0);

                         amSkip: TurnTimeLeft:= 0;

                         amRope: CurAmmoGear:= AddGear(hwRound(Gear^.X), hwRound(Gear^.Y), gtRope, 0, xx, yy, 0);

                         amMine: begin

                                 AddGear(hwRound(X) + hwSign(dX) * 7, hwRound(Y), gtMine, 0, SignAs(_0_02, dX), _0, 3000);

                                 PlaySound(sndLaugh, false)

                                 end;

                       amDEagle: AddGear(hwRound(X + xx * cHHRadius), hwRound(Y + yy * cHHRadius), gtDEagleShot, 0, xx * _0_5, yy * _0_5, 0);

                     amDynamite: AddGear(hwRound(X) + hwSign(dX) * 7, hwRound(Y), gtDynamite, 0, SignAs(_0_03, dX), _0, 5000);

                  amBaseballBat: AddGear(hwRound(X) + hwSign(dX) * 10, hwRound(Y), gtShover, 0, xx * _0_5, yy * _0_5, 0)^.Radius:= 20;

                    amFirePunch: CurAmmoGear:= AddGear(hwRound(X) + hwSign(dX) * 10, hwRound(Y), gtFirePunch, 0, _0, _0, 0);

                    amParachute: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtParachute, 0, _0, _0, 0);

                    amAirAttack: AddGear(Ammo^[CurSlot, CurAmmo].Pos, 0, gtAirAttack, 0, _0, _0, 0);

                   amMineStrike: AddGear(Ammo^[CurSlot, CurAmmo].Pos, 0, gtAirAttack, 1, _0, _0, 0);

                    amBlowTorch: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtBlowTorch, 0, SignAs(_0_5, dX), _0, 0);

                       amGirder: CurAmmoGear:= AddGear(0, 0, gtGirder, Ammo^[CurSlot, CurAmmo].Pos, _0, _0, 0);

                     amTeleport: CurAmmoGear:= AddGear(0, 0, gtTeleport, 0, _0, _0, 0);

                       amSwitch: CurAmmoGear:= AddGear(hwRound(X), hwRound(Y), gtSwitcher, 0, _0, _0, 0);

                  end;

        Power:= 0;

        if CurAmmoGear <> nil then

           begin

           Message:= Message or gm_Attack;

           CurAmmoGear^.Message:= Message

           end else begin

           if not CurrentTeam^.ExtDriven and

             ((Ammo^[CurSlot, CurAmmo].Propz and ammoprop_Power) <> 0) then SendIPC('a');

           AfterAttack

           end

        end else Message:= Message and not gm_Attack

     end

end;

procedure AfterAttack;

begin

with CurrentHedgehog^.Gear^,

     CurrentHedgehog^ do

     begin

        Inc(AttacksNum);

        State:= State and not gstAttacking;

        if (Ammo^[CurSlot, CurAmmo].NumPerTurn >= AttacksNum) or

           ((GameFlags and gfMultiWeapon) <> 0) then isInMultiShoot:= true

           else begin

           TurnTimeLeft:= Ammoz[Ammo^[CurSlot, CurAmmo].AmmoType].TimeAfterTurn;

           State:= State or gstAttacked;

           OnUsedAmmo(CurrentHedgehog^)

           end;

     AttackBar:= 0;

     end

end;

////////////////////////////////////////////////////////////////////////////////

procedure PickUp(HH, Gear: PGear);

var s: shortstring;

    a: TAmmoType;

begin

Gear^.Message:= gm_Destroy;

case Gear^.Pos of

       posCaseAmmo: begin

                    a:= TAmmoType(Gear^.State);

                    AddAmmo(PHedgehog(HH^.Hedgehog)^, a);

                    s:= trammo[Ammoz[a].NameId] + '(+' + IntToStr(Ammoz[a].NumberInCase) + ')';

                    AddCaption(s, PHedgehog(HH^.Hedgehog)^.Team^.Clan^.Color, capgrpAmmoinfo);

                    end;

     posCaseHealth: begin

                    inc(HH^.Health, Gear^.Health);

                    str(Gear^.Health, s);

                    s:= '+' + s;

                    AddCaption(s, PHedgehog(HH^.Hedgehog)^.Team^.Clan^.Color, capgrpAmmoinfo);

                    RenderHealth(PHedgehog(HH^.Hedgehog)^);

                    RecountTeamHealth(PHedgehog(HH^.Hedgehog)^.Team)

                    end;

     end

end;

const StepTicks: LongWord = 0;

procedure HedgehogStep(Gear: PGear);

var PrevdX: LongInt;

begin

if ((Gear^.State and (gstAttacking or gstMoving)) = 0) then

   begin

   if isCursorVisible then

      with PHedgehog(Gear^.Hedgehog)^ do

        with Ammo^[CurSlot, CurAmmo] do

          begin

          if (Gear^.Message and gm_Left  ) <> 0 then

             Pos:= (Pos + Ammoz[AmmoType].PosCount - 1) mod Ammoz[AmmoType].PosCount

          else

          if (Gear^.Message and gm_Right ) <> 0 then

             Pos:= (Pos + 1) mod Ammoz[AmmoType].PosCount

          else exit;

          StepTicks:= 200;

          exit

          end;

   if ((Gear^.Message and gm_LJump ) <> 0) then

      begin

      Gear^.Message:= Gear^.Message and not gm_LJump;

      DeleteCI(Gear);

      if not TestCollisionYwithGear(Gear, -1) then

         if not TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX)) then Gear^.Y:= Gear^.Y - _2 else

         if not TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithGear(Gear, hwSign(Gear^.dX))

         or   TestCollisionYwithGear(Gear, -1)) then

         begin

         Gear^.dY:= -_0_15;

         Gear^.dX:= SignAs(_0_15, Gear^.dX);

         Gear^.State:= Gear^.State or gstMoving or gstHHJumping;

         PlaySound(sndJump1, false);

         exit

         end;

      end;

   if ((Gear^.Message and gm_HJump ) <> 0) then

      begin

      DeleteCI(Gear);

      Gear^.Message:= Gear^.Message and not gm_HJump;

      if not TestCollisionYwithGear(Gear, -1) then

         begin

         Gear^.dY:= -_0_2;

         SetLittle(Gear^.dX);

         Gear^.State:= Gear^.State or gstMoving or gstHHJumping;

         PlaySound(sndJump3, false);

         exit

         end;

      end;

   PrevdX:= hwSign(Gear^.dX);

   if (Gear^.Message and gm_Left  )<>0 then Gear^.dX:= -cLittle else

   if (Gear^.Message and gm_Right )<>0 then Gear^.dX:=  cLittle else exit;

   StepTicks:= cHHStepTicks;

   if PrevdX <> hwSign(Gear^.dX) then

      begin

      FollowGear:= Gear;

      exit

      end;

   DeleteCI(Gear); // must be after exit!! (see previous line)

   PHedgehog(Gear^.Hedgehog)^.visStepPos:= (PHedgehog(Gear^.Hedgehog)^.visStepPos + 1) and 7;

   if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then

      begin

      if not (TestCollisionXwithXYShift(Gear, _0, -6, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -5, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -4, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -3, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      if not (TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX))

         or TestCollisionYwithGear(Gear, -1)) then Gear^.Y:= Gear^.Y - _1;

      end;

   if not TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then Gear^.X:= Gear^.X + SignAs(_1, Gear^.dX);

   SetAllHHToActive;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

   begin

   Gear^.Y:= Gear^.Y + _1;

   if not TestCollisionYwithGear(Gear, 1) then

      begin

      Gear^.Y:= Gear^.Y - _6;

      Gear^.dY:= _0;

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

      exit

      end;

   end

   end

   end

   end

   end

   end;

   AddGearCI(Gear)

   end

end;

procedure HedgehogChAngle(Gear: PGear);

begin

if ((Gear^.State and gstMoving) = 0) then

   if (Gear^.Message and gm_Up    )<>0 then if Gear^.Angle > CurMinAngle then dec(Gear^.Angle)

   else else

   if (Gear^.Message and gm_Down  )<>0 then if Gear^.Angle < CurMaxAngle then inc(Gear^.Angle);

end;

procedure doStepHedgehog(Gear: PGear); forward;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHedgehogMoving(Gear: PGear);

var isFalling: boolean;

begin

isFalling:= not TestCollisionYKick(Gear, 1);

if isFalling then

   begin

   if (Gear^.dY.isNegative) and TestCollisionYKick(Gear, -1) then Gear^.dY:= _0;

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

   Gear^.dY:= Gear^.dY + cGravity

   end else

   begin

   if ((hwAbs(Gear^.dX) + hwAbs(Gear^.dY)) < _0_55)

      and ((Gear^.State and gstHHJumping) <> 0) then SetLittle(Gear^.dX);

   if not Gear^.dY.isNegative then

      begin

      CheckHHDamage(Gear);

      if ((Gear^.State and gstHHHJump) <> 0) and

         (Gear^.dX.QWordValue < _0_02.QWordValue) then Gear^.dX.isNegative:= not Gear^.dX.isNegative; // landing after high jump

      Gear^.State:= Gear^.State and not (gstHHJumping or gstHHHJump);

      Gear^.dY:= _0;

      end else Gear^.dY:= Gear^.dY + cGravity;

   if ((Gear^.State and gstMoving) <> 0) then Gear^.dX:= Gear^.dX * Gear^.Friction

   end;

if (Gear^.State <> 0) then DeleteCI(Gear);

if (Gear^.State and gstMoving) <> 0 then

   if TestCollisionXKick(Gear, hwSign(Gear^.dX)) then

      if not isFalling then

         if hwAbs(Gear^.dX) > _0_01 then

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -1, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_96; Gear^.Y:= Gear^.Y - _1 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -2, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_93; Gear^.Y:= Gear^.Y - _2 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -3, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_9 ; Gear^.Y:= Gear^.Y - _3 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -4, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_87; Gear^.Y:= Gear^.Y - _4 end else

            if not TestCollisionXwithXYShift(Gear, int2hwFloat(hwSign(Gear^.dX)) - Gear^.dX, -5, hwSign(Gear^.dX)) then begin Gear^.X:= Gear^.X + Gear^.dX; Gear^.dX:= Gear^.dX * _0_84; Gear^.Y:= Gear^.Y - _5 end else

            if hwAbs(Gear^.dX) > _0_02 then Gear^.dX:= -Gear^.Elasticity * Gear^.dX

                                   else begin

                                        Gear^.State:= Gear^.State and not gstMoving;

                                        SetLittle(Gear^.dX)

                                        end

            else begin

                 Gear^.State:= Gear^.State and not gstMoving;

                 SetLittle(Gear^.dX)

                 end

         else if hwAbs(Gear^.dX) > cLittle then Gear^.dX:= -Gear^.Elasticity * Gear^.dX

                                           else SetLittle(Gear^.dX);

if (not isFalling) and

   (hwAbs(Gear^.dX) + hwAbs(Gear^.dY) < _0_03) then

   begin

   Gear^.State:= Gear^.State and not gstMoving;

   SetLittle(Gear^.dX);

   Gear^.dY:= _0

   end else Gear^.State:= Gear^.State or gstMoving;

if (Gear^.State and gstMoving) <> 0 then

   begin

   Gear^.State:= Gear^.State and not gstAnimation;

   Gear^.X:= Gear^.X + Gear^.dX;

   Gear^.Y:= Gear^.Y + Gear^.dY;

   if (not Gear^.dY.isNegative) and

      (not TestCollisionYKick(Gear, 1)) and

       TestCollisionYwithXYShift(Gear, 0, 1, 1) then

      begin

      CheckHHDamage(Gear);

      Gear^.dY:= _0;

      Gear^.Y:= Gear^.Y + _1

      end;

   CheckGearDrowning(Gear)

   end

end;

procedure doStepHedgehogDriven(Gear: PGear);

var t: PGear;

begin

if not isInMultiShoot then

   AllInactive:= false

else

   Gear^.Message:= 0;

if (TurnTimeLeft = 0) or (Gear^.Damage > 0) then

   begin

   TurnTimeLeft:= 0;

   Gear^.State:= Gear^.State and not gstHHDriven;

   if Gear^.Damage > 0 then

      Gear^.State:= Gear^.State and not (gstHHJumping or gstHHHJump);

   exit

   end;

if ((Gear^.State and gstMoving) <> 0)

   or (StepTicks = cHHStepTicks)

   or (CurAmmoGear <> nil) then // we're moving

   begin

   // check for case with ammo

   t:= CheckGearNear(Gear, gtCase, 36, 36);

   if t <> nil then

      PickUp(Gear, t)

   end;

if CurAmmoGear <> nil then

   begin

   CurAmmoGear^.Message:= Gear^.Message;

   exit

   end;

if ((Gear^.Message and gm_Slot) <> 0) then ChangeAmmo(Gear);

if ((Gear^.Message and gm_Weapon) <> 0) then HHSetWeapon(Gear);

if ((Gear^.Message and gm_Attack) <> 0) or

   ((Gear^.State and gstAttacking) <> 0) then Attack(Gear);

if (Gear^.State and gstMoving) <> 0 then

   begin

   if ((Gear^.Message and gm_HJump) <> 0) and

      ((Gear^.State and gstHHJumping) <> 0) and

      ((Gear^.State and gstHHHJump) = 0) then

      if (not (hwAbs(Gear^.dX) > cLittle)) and (Gear^.dY < -_0_02) then

         begin

         Gear^.State:= Gear^.State or gstHHHJump or gstMoving;

         Gear^.dY:= -_0_25;

         Gear^.dX:= -SignAs(_0_02, Gear^.dX);

         PlaySound(sndJump2, false)

         end;

   Gear^.Message:= Gear^.Message and not (gm_LJump or gm_HJump);

   if ((Gear^.State and gstHHJumping) <> 0) and

      TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then SetLittle(Gear^.dX);

   doStepHedgehogMoving(Gear);

   if (Gear^.State and gstMoving) = 0 then

      begin

      AddGearCI(Gear);

      StepTicks:= 350

      end;

   exit

   end;

   if not isInMultiShoot then

      begin

      HedgehogChAngle(Gear);

      if StepTicks > 0 then dec(StepTicks);

      if (StepTicks = 0) then HedgehogStep(Gear)

      end

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHedgehogFree(Gear: PGear);

var prevState: Longword;

begin

prevState:= Gear^.State;

doStepHedgehogMoving(Gear);

if (Gear^.State and gstMoving) = 0 then

   if Gear^.Health = 0 then

      begin

      if AllInactive then

         begin

         Gear^.State:= Gear^.State or gstNoDamage;

         doMakeExplosion(hwRound(Gear^.X), hwRound(Gear^.Y), 30, EXPLAutoSound);

         AddGear(hwRound(Gear^.X), hwRound(Gear^.Y), gtGrave, 0, _0, _0, 0)^.Hedgehog:= Gear^.Hedgehog;

         DeleteGear(Gear);