(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2004, 2005 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 doStepHedgehog(Gear: PGear); forward;

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

procedure doStepHedgehogDriven(Gear: PGear);

const StepTicks: LongWord = 0;

var t: PGear;

begin

if isinMultiShoot and (Gear.Damage = 0) then exit;

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;

// check for case with ammo

t:= CheckGearNear(Gear, gtCase, 30, 30);

if t <> nil then

   begin

   t.Message:= gm_Destroy;

   ; // take ammo from it

   end;

if CurAmmoGear <> nil then

   begin

   CurAmmoGear.Message:= Gear.Message;

   exit

   end;

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

      with PHedgehog(Gear.Hedgehog)^ do

            begin

            Gear.State:= Gear.State or gstAttacking;

               else begin

                  else begin

                  if Gear.Power = 0 then

                     begin

                     AttackBar:= CurrentTeam.AttackBar;

                     PlaySound(sndThrowPowerUp)

                     end;

                  inc(Gear.Power)

                  end

               end;

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

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:= 200;

      Gear.dY:= 0

      end;

   CheckGearDrowning(Gear);

   exit

   end;

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;

      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;

      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:= 40;

   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;

   SetAllHHToActive

   end

   end

   end

   end

   end

   end

   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 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;

      AddGearCR(Gear);

      exit

      end

end;

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

procedure doStepHedgehog(Gear: PGear);

begin

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

   begin

   DeleteGear(Gear);

   exit

   end;

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

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

                                    else doStepHedgehogDriven(Gear)

end;