(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2004, 2005, 2006 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * Distributed under the terms of the BSD-modified licence:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * with the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO

 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *)

procedure AddIntersectorsCR(Gear: PGear);

var t: PGear;

    x, xw, y, yh: real;

    ar: array[0..Pred(cMaxHHs)] of PGear;

    cnt: Longword;

    b: boolean;

begin

x:= Gear.X - Gear.HalfWidth;

xw:= Gear.X + Gear.HalfWidth;

y:= Gear.Y - Gear.HalfHeight;

yh:= Gear.Y + Gear.HalfHeight;

t:= GearsList;

b:= false;

cnt:= 0;

while (t <> nil) do

      begin

      if (t <> Gear) and not (t.Kind in [gtGrave, gtMine]) then

         if (x < t.X + t.HalfWidth ) and (t.X - t.HalfWidth  < xw) and

            (y < t.Y + t.HalfHeight) and (t.Y - t.HalfHeight < yh) then

            if t.Kind = gtHedgehog then

               begin

               ar[cnt]:= t;

               inc(cnt)

               end else b:= true;

      t:= t.NextGear

      end;

ar[cnt]:= Gear;

inc(cnt);

if b then

   begin

   repeat

     dec(cnt);

     if ar[cnt].CollIndex < High(Longword) then DeleteCR(ar[cnt])

   until cnt = 0;

   end else

   begin

   repeat

     dec(cnt);

     if ar[cnt].CollIndex = High(Longword) then AddGearCR(ar[cnt])

   until cnt = 0

   end

end;

procedure RemoveIntersectorsCR(Gear: PGear);

var t: PGear;

    x, xw, y, yh: real;

begin

x:= Gear.X - Gear.HalfWidth;

xw:= Gear.X + Gear.HalfWidth;

y:= Gear.Y - Gear.HalfHeight;

yh:= Gear.Y + Gear.HalfHeight;

t:= GearsList;

while (t <> nil) do

      begin

      if (t <> Gear) then

         if (x < t.X + t.HalfWidth ) and (t.X - t.HalfWidth  < xw) and

            (y < t.Y + t.HalfHeight) and (t.Y - t.HalfHeight < yh) then

               if t.CollIndex < High(Longword) then DeleteCR(t);

      t:= t.NextGear

      end;

if Gear.CollIndex < High(Longword) then DeleteCR(Gear);

end;

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

procedure Attack(Gear: PGear);

var xx, yy: real;

begin

with Gear^,

     CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog] do

     begin

     {$IFDEF DEBUGFILE}AddFileLog('Attack: Gear.State = '+inttostr(State)+' CurAmmoGear = '+inttostr(longword(CurAmmoGear)));{$ENDIF}

     if CurAmmoGear <> nil then

        begin

        Message:= Message and not gm_Attack;

        if not CurrentTeam.ExtDriven then SendIPC('a')

        end;

     if (((State and (gstHHDriven or gstAttacking)) = (gstHHDriven or gstAttacking))and

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

        (((State and gstFalling  ) = 0)or((Ammo[CurSlot, CurAmmo].Propz and ammoprop_AttackInFall) <> 0))and

        (((State and gstHHJumping) = 0)or((Ammo[CurSlot, CurAmmo].Propz and ammoprop_AttackInJump) <> 0)))and

        (CurAmmoGear = nil) then

        begin

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

           begin

           StopTPUSound;

           PlaySound(sndThrowRelease);

           end;

        xx:= Sign(dX)*Sin(Angle*pi/cMaxAngle);

        yy:= -Cos(Angle*pi/cMaxAngle);

             case Ammo[CurSlot, CurAmmo].AmmoType of

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

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

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

                      amShotgun: begin

                                 PlaySound(sndShotgunReload);

                                 FollowGear:= AddGear(round(X), round(Y), gtShotgunShot,  0, xx * 0.5, yy * 0.5);

                                 end;

                       amDEagle: begin

                                 FollowGear:= AddGear(round(X), round(Y), gtDEagleShot,   0, xx * 0.5, yy * 0.5);

                                 end;

                         amSkip: TurnTimeLeft:= 0;

                   amPickHammer: CurAmmoGear:= AddGear(round(Gear.X), round(Gear.Y) + cHHHalfHeight, gtPickHammer, 0);

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

                         amMine: AddGear(round(X) + Sign(dX) * 7, round(Y), gtMine, 0, Sign(dX) * 0.01, 0, 3000);

                     amDynamite: AddGear(round(X) + Sign(dX) * 7, round(Y), gtDynamite, 0, Sign(dX) * 0.01, 0, 5000); 

                  end;

        Power:= 0;

        if CurAmmoGear <> nil then

           begin

           Gear.Message:= Gear.Message or gm_Attack;

           CurAmmoGear.Message:= Gear.Message;

           exit

           end else

           begin

           Message:= Message and not gm_Attack;

           if not CurrentTeam.ExtDriven then SendIPC('a')

           end;

        AfterAttack

        end

     end

end;

procedure AfterAttack;

begin

with CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog].Gear^,

     CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog] do

     begin

        Inc(AttacksNum);

        State:= State and not gstAttacking;

        if Ammo[CurSlot, CurAmmo].NumPerTurn >= AttacksNum then isInMultiShoot:= true

           else begin

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

           State:= State or gstAttacked;

           OnUsedAmmo(Ammo)

           end;

     AttackBar:= 0

     end

end;

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

procedure PickUp(HH, Gear: PGear);

begin

case Gear.Pos of

     posCaseHealth: begin

                    inc(HH.Health, Gear.Health);

                    RenderHealth(PHedgehog(HH.Hedgehog)^);

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

                    end;

     end;

end;

procedure doStepHedgehog(Gear: PGear); forward;

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

procedure doStepHedgehogDriven(Gear: PGear);

const StepTicks: LongWord = 0;

      cStepTicks = 38;

var t: PGear;

begin

if isinMultiShoot and (Gear.Damage = 0) then

   begin

   if Gear.CollIndex = High(Longword) then AddIntersectorsCR(Gear);

   exit

   end;

AllInactive:= false;

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

   begin

   if ((Gear.State and (gstMoving or gstFalling)) = 0)

      and (CurAmmoGear = nil) then Gear.dX:= 0.0000001 * Sign(Gear.dX);

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

   if Gear.Damage > 0 then

      Gear.State:= Gear.State and not gstHHJumping;

   exit

   end;

if ((Gear.State and gstFalling) <> 0) or (StepTicks = cStepTicks)

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

   begin

   // check for case with ammo

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

   if t <> nil then

      begin

      t.Message:= gm_Destroy;

      PickUp(Gear, t)

      end;

   end;

if CurAmmoGear <> nil then

   begin

   CurAmmoGear.Message:= Gear.Message;

   exit

   end;

if (Gear.Message and gm_Attack)<>0 then

   if (Gear.State and (gstAttacked or gstHHChooseTarget) = 0) then

      with PHedgehog(Gear.Hedgehog)^ do

            begin

            Gear.State:= Gear.State or gstAttacking;

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

               else

               if (Ammo[CurSlot, CurAmmo].Propz and ammoprop_Power) = 0 then

                  Gear.Message:= Gear.Message and not gm_Attack

                  else begin

                  if Gear.Power = 0 then

                     begin

                     AttackBar:= CurrentTeam.AttackBar;

                     PlaySound(sndThrowPowerUp)

                     end;

                  inc(Gear.Power)

                  end

            end

      else Gear.Message:= Gear.Message and not gm_Attack;

if ((Gear.State and gstAttacking) <> 0) and ((Gear.Message and gm_Attack) = 0) then

   begin

   RemoveIntersectorsCR(Gear);

   Attack(Gear);

   StepTicks:= 40

   end;

if (Gear.State and gstFalling) <> 0 then

   begin

   // it could be the source to trick: double-backspace jump -> vertical wall

   // collision - > (abs(Gear.dX) < 0.0000002) -> backspace -> even more high jump

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

      if (abs(Gear.dX) < 0.0000002) and (Gear.dY < -0.02) then

         begin

         Gear.dY:= -0.25;

         Gear.dX:= Sign(Gear.dX) * 0.02

         end;

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

   if TestCollisionXwithGear(Gear, Sign(Gear.dX)) then Gear.dX:= 0.0000001 * Sign(Gear.dX);

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

   Gear.dY:= Gear.dY + cGravity;

   if (Gear.dY < 0)and TestCollisionYwithGear(Gear, -1) then Gear.dY:= 0; 

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

   if (Gear.dY >= 0)and HHTestCollisionYwithGear(Gear, 1) then

      begin

      CheckHHDamage(Gear);

      if ((abs(Gear.dX) + abs(Gear.dY)) < 0.55)

         and ((Gear.State and gstHHJumping) <> 0) then Gear.dX:= 0.0000001 * Sign(Gear.dX);

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

      StepTicks:= 300; 

      Gear.dY:= 0

      end;

   CheckGearDrowning(Gear);

   exit

   end else if Gear.CollIndex = High(Longword) then AddIntersectorsCR(Gear);

if StepTicks > 0 then dec(StepTicks);

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

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

      else else

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

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

   begin

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

      begin

      Gear.Message:= 0;

      RemoveIntersectorsCR(Gear);

      if not HHTestCollisionYwithGear(Gear, -1) then

         if not TestCollisionXwithXYShift(Gear, 0, -2, Sign(Gear.dX)) then Gear.Y:= Gear.Y - 2 else

         if not TestCollisionXwithXYShift(Gear, 0, -1, Sign(Gear.dX)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithGear(Gear, Sign(Gear.dX))

         or   HHTestCollisionYwithGear(Gear, -1)) then

         begin

         Gear.dY:= -0.15;

         Gear.dX:= Sign(Gear.dX) * 0.15;

         Gear.State:= Gear.State or gstFalling or gstHHJumping;

         exit

         end;

      end;

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

      begin

      Gear.Message:= 0;

      RemoveIntersectorsCR(Gear);

      if not HHTestCollisionYwithGear(Gear, -1) then

         begin

         Gear.dY:= -0.20;

         Gear.dX:= 0.0000001 * Sign(Gear.dX);

         Gear.X:= Gear.X - Sign(Gear.dX)*0.00008; // êîìïåíñàöèÿ ñäâèãà %)

         Gear.State:= Gear.State or gstFalling or gstHHJumping;

         exit

         end;

      end;

   if (Gear.Message and gm_Left  )<>0 then Gear.dX:= -1.0 else

   if (Gear.Message and gm_Right )<>0 then Gear.dX:=  1.0 else exit;

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

   StepTicks:= cStepTicks;

   RemoveIntersectorsCR(Gear);

   if TestCollisionXwithGear(Gear, Sign(Gear.dX)) then

      begin

      if not (TestCollisionXwithXYShift(Gear, 0, -6, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithXYShift(Gear, 0, -5, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithXYShift(Gear, 0, -4, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithXYShift(Gear, 0, -3, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithXYShift(Gear, 0, -2, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      if not (TestCollisionXwithXYShift(Gear, 0, -1, Sign(Gear.dX))

         or HHTestCollisionYwithGear(Gear, -1)) then Gear.Y:= Gear.Y - 1;

      end;

   if not TestCollisionXwithGear(Gear, Sign(Gear.dX)) then Gear.X:= Gear.X + Gear.dX;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   Gear.Y:= Gear.Y + 1;

   if not HHTestCollisionYwithGear(Gear, 1) then

      begin

      Gear.Y:= Gear.Y - 6;

      Gear.dY:= 0;

      Gear.dX:= 0.0000001 * Sign(Gear.dX);

      Gear.State:= Gear.State or gstFalling

      end;

   end

   end

   end

   end

   end

   end;

   SetAllHHToActive

   end

end;

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

procedure doStepHedgehogFree(Gear: PGear);

begin

if not HHTestCollisionYwithGear(Gear, 1) then

   begin

   if (Gear.dY < 0) and HHTestCollisionYwithGear(Gear, -1) then Gear.dY:= 0;

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

   Gear.dY:= Gear.dY + cGravity

   end else begin

   CheckHHDamage(Gear);

   if ((abs(Gear.dX) + abs(Gear.dY)) < 0.55)

      and ((Gear.State and gstHHJumping) <> 0) then Gear.dX:= 0.0000001 * Sign(Gear.dX);

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

   if Gear.dY > 0    then Gear.dY:= 0;

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

   end;

if (Gear.State <> 0) and (Gear.CollIndex < High(Longword)) then DeleteCR(Gear);

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

   if TestCollisionXwithGear(Gear, Sign(Gear.dX)) then

      if ((Gear.State and gstFalling) = 0) then

         if abs(Gear.dX) > 0.01 then

            if not TestCollisionXwithXYShift(Gear, 0, -1, Sign(Gear.dX)) then begin Gear.dX:= Gear.dX * 0.9; Gear.Y:= Gear.Y - 1 end else

            if not TestCollisionXwithXYShift(Gear, 0, -2, Sign(Gear.dX)) then begin Gear.dX:= Gear.dX * 0.9; Gear.Y:= Gear.Y - 2 end else

            if not TestCollisionXwithXYShift(Gear, 0, -3, Sign(Gear.dX)) then begin Gear.dX:= Gear.dX * 0.9; Gear.Y:= Gear.Y - 3 end else

            if not TestCollisionXwithXYShift(Gear, 0, -4, Sign(Gear.dX)) then begin Gear.dX:= Gear.dX * 0.9; Gear.Y:= Gear.Y - 4 end else

            if not TestCollisionXwithXYShift(Gear, 0, -5, Sign(Gear.dX)) then begin Gear.dX:= Gear.dX * 0.3; Gear.Y:= Gear.Y - 5 end else

            if abs(Gear.dX) > 0.02 then Gear.dX:= -0.5 * Gear.dX

                                   else begin

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

                                        Gear.dX:= 0.0000001 * Sign(Gear.dX)

                                        end

                                   else begin

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

                                        Gear.dX:= 0.0000001 * Sign(Gear.dX)

                                        end

         else Gear.dX:= -0.8 * Gear.dX;

if ((Gear.State and gstFalling) = 0)and

   (sqr(Gear.dX) + sqr(Gear.dY) < 0.0008) then

   begin

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

   Gear.dX:= 0.0000001 * Sign(Gear.dX);

   Gear.dY:= 0

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

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

   begin

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

   Gear.Y:= Gear.Y + Gear.dY

   end else

   if Gear.Health = 0 then

      begin

      if AllInactive then

         begin

         doMakeExplosion(round(Gear.X), round(Gear.Y), 30, EXPLAutoSound);

         AddGear(round(Gear.X), round(Gear.Y), gtGrave, 0).Hedgehog:= Gear.Hedgehog;

         DeleteGear(Gear);

         SetAllToActive

         end;

      AllInactive:= false;  

      exit

      end;

AllInactive:= false;

if (not CheckGearDrowning(Gear)) and

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

      begin

      Gear.State:= 0;

      Gear.Active:= false;

      AddIntersectorsCR(Gear);

      exit

      end

end;

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

procedure doStepHedgehog(Gear: PGear);

begin

if (Gear.Message and gm_Destroy) <> 0 then

   begin

   DeleteGear(Gear);

   exit

   end;

if (Gear.State and gstHHDriven) = 0 then doStepHedgehogFree(Gear)

                                    else doStepHedgehogDriven(Gear)

end;