(*

 * Hedgewars, a worms-like game

 * Copyright (c) 2005, 2006 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

 *)

unit uAI;

interface

{$INCLUDE options.inc}

procedure ProcessBot;

procedure FreeActionsList;

implementation

uses uTeams, uConsts, SDLh, uAIMisc, uGears, uAIAmmoTests, uAIActions, uMisc;

var BestActions: TActions;

    ThinkThread: PSDL_Thread = nil;

    StopThinking: boolean;

    CanUseAmmo: array [TAmmoType] of boolean;

procedure FreeActionsList;

begin

{$IFDEF DEBUGFILE}AddFileLog('FreeActionsList called');{$ENDIF}

if ThinkThread <> nil then

   begin

   {$IFDEF DEBUGFILE}AddFileLog('Waiting AI thread to finish');{$ENDIF}

   StopThinking:= true;

   SDL_WaitThread(ThinkThread, nil);

   ThinkThread:= nil

   end;

BestActions.Count:= 0;

BestActions.Pos:= 0

end;

procedure TestAmmos(var Actions: TActions; Me: PGear);

var Time, BotLevel: Longword;

    Angle, Power, Score, ExplX, ExplY, ExplR: integer;

    i: integer;

    a, aa: TAmmoType;

begin

BotLevel:= PHedgehog(Me.Hedgehog).BotLevel;

for i:= 0 to Pred(Targets.Count) do

    if (Targets.ar[i].Score >= 0) then

       begin

       with CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog] do

            a:= Ammo[CurSlot, CurAmmo].AmmoType;

       aa:= a;

       repeat

        if CanUseAmmo[a] then

           begin

           Score:= AmmoTests[a](Me, Targets.ar[i].Point, BotLevel, Time, Angle, Power, ExplX, ExplY, ExplR);

           if Actions.Score + Score > BestActions.Score then

              begin

              BestActions:= Actions;

              inc(BestActions.Score, Score);

              AddAction(BestActions, aia_Weapon, Longword(a), 500);

              if Time <> 0 then AddAction(BestActions, aia_Timer, Time div 1000, 400);

              if (Angle > 0) then AddAction(BestActions, aia_LookRight, 0, 200)

              else if (Angle < 0) then AddAction(BestActions, aia_LookLeft, 0, 200);

              if (Ammoz[a].Ammo.Propz and ammoprop_NoCrosshair) = 0 then

                 begin

                 Angle:= integer(Me.Angle) - Abs(Angle);

                 if Angle > 0 then

                    begin

                    AddAction(BestActions, aia_Up, aim_push, 500);

                    AddAction(BestActions, aia_Up, aim_release, Angle)

                    end else if Angle < 0 then

                    begin

                    AddAction(BestActions, aia_Down, aim_push, 500);

                    AddAction(BestActions, aia_Down, aim_release, -Angle)

                    end

                 end;

              AddAction(BestActions, aia_attack, aim_push, 800);

              AddAction(BestActions, aia_attack, aim_release, Power);

              if ExplR > 0 then

                 AddAction(BestActions, aia_AwareExpl, ExplR, 10, ExplX, ExplY);

              end

           end;

        if a = High(TAmmoType) then a:= Low(TAmmoType)

                               else inc(a)

       until (a = aa) or (CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog].AttacksNum > 0)

       end

end;

procedure Walk(Me: PGear);

const FallPixForBranching = cHHRadius * 2 + 8;

      cBranchStackSize = 12;

type TStackEntry = record

                   WastedTicks: Longword;

                   MadeActions: TActions;

                   Hedgehog: TGear;

                   end;

var Stack: record

           Count: Longword;

           States: array[0..Pred(cBranchStackSize)] of TStackEntry;

           end;

    function Push(Ticks: Longword; const Actions: TActions; const Me: TGear; Dir: integer): boolean;

    begin

    Result:= (Stack.Count < cBranchStackSize) and (Actions.Count < MAXACTIONS - 5);

    if Result then

       with Stack.States[Stack.Count] do

            begin

            WastedTicks:= Ticks;

            MadeActions:= Actions;

            Hedgehog:= Me;

            Hedgehog.Message:= Dir;

            inc(Stack.Count)

            end

    end;

    procedure Pop(out Ticks: Longword; out Actions: TActions; out Me: TGear);

    begin

    dec(Stack.Count);

    with Stack.States[Stack.Count] do

         begin

         Ticks:= WastedTicks;

         Actions:= MadeActions;

         Me:= Hedgehog

         end

    end;

    function PosInThinkStack(Me: PGear): boolean;

    var i: Longword;

    begin

    i:= 0;

    Result:= false;

    while (i < Stack.Count) and not Result do

          begin

          Result:= (abs(Stack.States[i].Hedgehog.X - Me.X) +

                    abs(Stack.States[i].Hedgehog.Y - Me.Y) <= 2)

                    and (Stack.States[i].Hedgehog.Message = Me.Message);

          inc(i)

          end

    end;

var Actions: TActions;

    ticks, maxticks, steps, BotLevel, tmp: Longword;

    BaseRate, BestRate, Rate: integer;

    GoInfo: TGoInfo;

    CanGo: boolean;

    AltMe: TGear;

begin

Actions.Count:= 0;

Actions.Pos:= 0;

Actions.Score:= 0;

Stack.Count:= 0;

BotLevel:= PHedgehog(Me.Hedgehog).BotLevel;

tmp:= random(2) + 1;

Push(0, Actions, Me^, tmp);

Push(0, Actions, Me^, tmp xor 3);

if (Me.State and gstAttacked) = 0 then maxticks:= max(0, TurnTimeLeft - 5000 - 4000 * BotLevel)

                                  else maxticks:= TurnTimeLeft;

if (Me.State and gstAttacked) = 0 then TestAmmos(Actions, Me);

BestRate:= RatePlace(Me);

BaseRate:= max(BestRate, 0);

while (Stack.Count > 0) and not StopThinking do

    begin

    Pop(ticks, Actions, Me^);

    AddAction(Actions, Me.Message, aim_push, 250);

    AddAction(Actions, aia_WaitX, round(Me.X), 0);

    AddAction(Actions, Me.Message, aim_release, 0);

    steps:= 0;

    while (not StopThinking) and (not PosInThinkStack(Me)) do

       begin

       CanGo:= HHGo(Me, @AltMe, GoInfo);

       inc(ticks, GoInfo.Ticks);

       if ticks > maxticks then break;

       if (BotLevel < 5) and (GoInfo.JumpType = jmpHJump) then // hjump support

          if Push(ticks, Actions, AltMe, Me^.Message) then

             with Stack.States[Pred(Stack.Count)] do

                  begin

                  AddAction(MadeActions, aia_HJump, 0, 305);

                  AddAction(MadeActions, aia_HJump, 0, 350);

                  end;

       if (BotLevel < 3) and (GoInfo.JumpType = jmpLJump) then // ljump support

          if Push(ticks, Actions, AltMe, Me^.Message) then

             with Stack.States[Pred(Stack.Count)] do

                  AddAction(MadeActions, aia_LJump, 0, 305);

       if not CanGo then break;

       inc(steps);

       Actions.actions[Actions.Count - 2].Param:= round(Me.X);

       Rate:= RatePlace(Me);

       if Rate > BestRate then

          begin

          BestActions:= Actions;

          BestRate:= Rate;

          Me.State:= Me.State or gstAttacked // we have better place, go there and don't use ammo

          end

       else if Rate < BestRate then break;

       if ((Me.State and gstAttacked) = 0)

           and ((steps mod 4) = 0) then TestAmmos(Actions, Me);

       if GoInfo.FallPix >= FallPixForBranching then

          Push(ticks, Actions, Me^, Me^.Message xor 3); // aia_Left xor 3 = aia_Right

       end;

    if BestRate > BaseRate then exit

    end

end;

procedure Think(Me: PGear); cdecl;

var BackMe, WalkMe: TGear;

    StartTicks: Longword;

begin

StartTicks:= GameTicks;

BestActions.Count:= 0;

BestActions.Pos:= 0;

BestActions.Score:= Low(integer);

BackMe:= Me^;

WalkMe:= BackMe;

if (Me.State and gstAttacked) = 0 then

   if Targets.Count > 0 then

      begin

      Walk(@WalkMe);

      if (StartTicks > GameTicks - 1500) and not StopThinking then SDL_Delay(2000);

      if BestActions.Score < -1023 then

         begin

         BestActions.Count:= 0;

         AddAction(BestActions, aia_Skip, 0, 250);

         end;

      end else

else begin

      Walk(@WalkMe);

      while (not StopThinking) and (BestActions.Count = 0) do

            begin

            SDL_Delay(100);

            FillBonuses(true);

            WalkMe:= BackMe;

            Walk(@WalkMe)

            end

      end;

Me.State:= Me.State and not gstHHThinking

end;

procedure StartThink(Me: PGear);

var a: TAmmoType;

begin

if ((Me.State and gstAttacking) <> 0) or isInMultiShoot then exit;

Me.State:= Me.State or gstHHThinking;

Me.Message:= 0;

StopThinking:= false;

ThinkingHH:= Me;

FillTargets;

if Targets.Count = 0 then

   begin

   OutError('AI: no targets!?');

   exit

   end;

FillBonuses((Me.State and gstAttacked) <> 0);

for a:= Low(TAmmoType) to High(TAmmoType) do

    CanUseAmmo[a]:= Assigned(AmmoTests[a]) and HHHasAmmo(PHedgehog(Me.Hedgehog), a);

{$IFDEF DEBUGFILE}AddFileLog('Enter Think Thread');{$ENDIF}

ThinkThread:= SDL_CreateThread(@Think, Me)

end;

procedure ProcessBot;

const StartTicks: Longword = 0;

begin

with CurrentTeam.Hedgehogs[CurrentTeam.CurrHedgehog] do

     if (Gear <> nil)

        and ((Gear.State and gstHHDriven) <> 0)

        and (TurnTimeLeft < cHedgehogTurnTime - 50) then

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

           if (BestActions.Pos >= BestActions.Count) then

              begin

              StartThink(Gear);

              StartTicks:= GameTicks

              end else ProcessAction(BestActions, Gear)

        else if (GameTicks - StartTicks) > cMaxAIThinkTime then StopThinking:= true

end;

end.