(*
 * 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 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)^)
                    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; // компенсация сдвига %)
         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;
   AddIntersectorsCR(Gear);
   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;