(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2012 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

 *)

{$INCLUDE "options.inc"}

unit uAI;

interface

uses uFloat;

procedure initModule;

procedure freeModule;

procedure ProcessBot;

procedure FreeActionsList;

implementation

uses uConsts, SDLh, uAIMisc, uAIAmmoTests, uAIActions,

    uAmmos, SysUtils{$IFNDEF USE_SDLTHREADS} {$IFDEF UNIX}, cthreads{$ENDIF} {$ENDIF}, uTypes,

    uVariables, uCommands, uUtils, uDebug, uAILandMarks;

var BestActions: TActions;

    CanUseAmmo: array [TAmmoType] of boolean;

    StopThinking: boolean;

{$IFDEF USE_SDLTHREADS} 

    ThinkThread: PSDL_Thread = nil;

{$ELSE}

    ThinkThread: TThreadID;

{$ENDIF}

    hasThread: LongInt;

    StartTicks: Longword;

procedure FreeActionsList;

begin

    AddFileLog('FreeActionsList called');

    if hasThread <> 0 then

    begin

        AddFileLog('Waiting AI thread to finish');

        StopThinking:= true;

        repeat

            SDL_Delay(10)

        until hasThread = 0

    end;

    with CurrentHedgehog^ do

        if Gear <> nil then

            if BotLevel <> 0 then

                StopMessages(Gear^.Message);

    BestActions.Count:= 0;

    BestActions.Pos:= 0

end;

const 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;

var bRes: boolean;

begin

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

    if bRes then

        with Stack.States[Stack.Count] do

            begin

            WastedTicks:= Ticks;

            MadeActions:= Actions;

            Hedgehog:= Me;

            Hedgehog.Message:= Dir;

            inc(Stack.Count)

            end;

    Push:= bRes

end;

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

begin

    dec(Stack.Count);

    with Stack.States[Stack.Count] do

        begin

        Ticks:= WastedTicks;

        Actions:= MadeActions;

        Me:= Hedgehog

        end

end;

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

var BotLevel: Byte;

    ap: TAttackParams;

    Score, i, dAngle: LongInt;

    a, aa: TAmmoType;

begin

BotLevel:= Me^.Hedgehog^.BotLevel;

windSpeed:= hwFloat2Float(cWindSpeed);

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

    if (Targets.ar[i].Score >= 0) and (not StopThinking) then

        begin

        with Me^.Hedgehog^ do

            a:= CurAmmoType;

        aa:= a;

{$IFDEF USE_SDLTHREADS}

        SDL_delay(0);    //ThreadSwitch was only a hint

{$ELSE}

        ThreadSwitch();

{$ENDIF}       

        repeat

        if (CanUseAmmo[a]) 

            and ((not isMoved) or ((AmmoTests[a].flags and amtest_OnTurn) = 0)) 

            and ((i = 0) or ((AmmoTests[a].flags and amtest_NoTarget) = 0)) 

            then

            begin

{$HINTS OFF}

            Score:= AmmoTests[a].proc(Me, Targets.ar[i].Point, BotLevel, ap);

{$HINTS ON}

            if Actions.Score + Score > BestActions.Score then

                if (BestActions.Score < 0) or (Actions.Score + Score > BestActions.Score + Byte(BotLevel) * 2048) then

                    begin

                    BestActions:= Actions;

                    inc(BestActions.Score, Score);

                    BestActions.isWalkingToABetterPlace:= false;

                    AddAction(BestActions, aia_Weapon, Longword(a), 300 + random(400), 0, 0);

                    if (ap.Angle > 0) then

                        AddAction(BestActions, aia_LookRight, 0, 200, 0, 0)

                    else if (ap.Angle < 0) then

                        AddAction(BestActions, aia_LookLeft, 0, 200, 0, 0);

                    if (ap.Time <> 0) then

                        AddAction(BestActions, aia_Timer, ap.Time div 1000, 400, 0, 0);

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

                        begin

                        dAngle:= LongInt(Me^.Angle) - Abs(ap.Angle);

                        if dAngle > 0 then

                            begin

                            AddAction(BestActions, aia_Up, aim_push, 300 + random(250), 0, 0);

                            AddAction(BestActions, aia_Up, aim_release, dAngle, 0, 0)

                            end

                        else if dAngle < 0 then

                            begin

                            AddAction(BestActions, aia_Down, aim_push, 300 + random(250), 0, 0);

                            AddAction(BestActions, aia_Down, aim_release, -dAngle, 0, 0)

                            end

                        end;

                    if (Ammoz[a].Ammo.Propz and ammoprop_NeedTarget) <> 0 then

                        begin

                        AddAction(BestActions, aia_Put, 0, 1, ap.AttackPutX, ap.AttackPutY)

                        end;

                    if (Ammoz[a].Ammo.Propz and ammoprop_OscAim) <> 0 then

                        begin

                        AddAction(BestActions, aia_attack, aim_push, 350 + random(200), 0, 0);

                        AddAction(BestActions, aia_attack, aim_release, 1, 0, 0);

                        if abs(ap.Angle) > 32 then

                           begin

                           AddAction(BestActions, aia_Down, aim_push, 100 + random(150), 0, 0);

                           AddAction(BestActions, aia_Down, aim_release, 32, 0, 0);

                           end;

                        AddAction(BestActions, aia_waitAngle, ap.Angle, 250, 0, 0);

                        AddAction(BestActions, aia_attack, aim_push, 1, 0, 0);

                        AddAction(BestActions, aia_attack, aim_release, 1, 0, 0);

                        end else

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

                            begin

                            AddAction(BestActions, aia_attack, aim_push, 650 + random(300), 0, 0);

                            AddAction(BestActions, aia_attack, aim_release, ap.Power, 0, 0);

                            end;

                    if (Ammoz[a].Ammo.Propz and ammoprop_Track) <> 0 then

                        begin

                        AddAction(BestActions, aia_waitAmmoXY, 0, 12, ap.ExplX, ap.ExplY);

                        AddAction(BestActions, aia_attack, aim_push, 1, 0, 0);

                        AddAction(BestActions, aia_attack, aim_release, 7, 0, 0);

                        end;

                    if ap.ExplR > 0 then

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

                    end

            end;

        if a = High(TAmmoType) then

            a:= Low(TAmmoType)

        else inc(a)

        until (a = aa) or (CurrentHedgehog^.MultiShootAttacks > 0) {shooting same weapon}

            or StopThinking

        end

end;

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

const FallPixForBranching = cHHRadius;

var

    ticks, maxticks, steps, tmp: Longword;

    BaseRate, BestRate, Rate: integer;

    GoInfo: TGoInfo;

    CanGo: boolean;

    AltMe: TGear;

    BotLevel: Byte;

    a: TAmmoType;

begin

ticks:= 0; // avoid compiler hint

Stack.Count:= 0;

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

    CanUseAmmo[a]:= Assigned(AmmoTests[a].proc) and (HHHasAmmo(Me^.Hedgehog^, a) > 0);

BotLevel:= Me^.Hedgehog^.BotLevel;

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

    maxticks:= Max(0, TurnTimeLeft - 5000 - LongWord(4000 * BotLevel))

else

    maxticks:= TurnTimeLeft;

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

    TestAmmos(Actions, Me, false);

BestRate:= RatePlace(Me);

BaseRate:= Max(BestRate, 0);

// switch to 'skip' if we can't move because of mouse cursor being shown

if (Ammoz[Me^.Hedgehog^.CurAmmoType].Ammo.Propz and ammoprop_NeedTarget) <> 0 then

    AddAction(Actions, aia_Weapon, Longword(amSkip), 100 + random(200), 0, 0);

if ((CurrentHedgehog^.MultiShootAttacks = 0) or ((Ammoz[Me^.Hedgehog^.CurAmmoType].Ammo.Propz and ammoprop_NoMoveAfter) = 0)) 

    and (GameFlags and gfArtillery = 0) then

    begin

    tmp:= random(2) + 1;

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

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

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

        begin

        Pop(ticks, Actions, Me^);

        AddAction(Actions, Me^.Message, aim_push, 250, 0, 0);

        if (Me^.Message and gmLeft) <> 0 then

            AddAction(Actions, aia_WaitXL, hwRound(Me^.X), 0, 0, 0)

        else

            AddAction(Actions, aia_WaitXR, hwRound(Me^.X), 0, 0, 0);

        steps:= 0;

        while (not StopThinking) do

            begin

    {$HINTS OFF}

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

    {$HINTS ON}

            inc(ticks, GoInfo.Ticks);

            if ticks > maxticks then

                break;

                // check if we could go backwards and maybe ljump over a gap after this hjump

                if Push(ticks, Actions, AltMe, Me^.Message xor 3) then

                    begin

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

                        begin

                        if Me^.dX.isNegative then

                            AddAction(MadeActions, aia_LookRight, 0, 200, 0, 0)

                        else

                            AddAction(MadeActions, aia_LookLeft, 0, 200, 0, 0);

                        AddAction(MadeActions, aia_HJump, 0, 305 + random(50), 0, 0);

                        AddAction(MadeActions, aia_HJump, 0, 350, 0, 0);

                        if Me^.dX.isNegative then

                            AddAction(MadeActions, aia_LookLeft, 0, 200, 0, 0)

                        else

                            AddAction(MadeActions, aia_LookRight, 0, 200, 0, 0);

                        end;

                    // but first check walking forward

                    Push(ticks, Stack.States[Pred(Stack.Count)].MadeActions, AltMe, Me^.Message)

                    end;

                begin

                // at final check where we go after jump walking backward

                if Push(ticks, Actions, AltMe, Me^.Message xor 3) then

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

                        AddAction(MadeActions, aia_LJump, 0, 305 + random(50), 0, 0);

                // push current position so we proceed from it after checking jump+forward walk opportunities

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

                // first check where we go after jump walking forward

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

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

                        AddAction(MadeActions, aia_LJump, 0, 305 + random(50), 0, 0);

                break

                end;

            // 'not CanGO' means we can't go straight, possible jumps are checked above

            if not CanGo then

                break;

             inc(steps);

             Actions.actions[Pred(Actions.Count)].Param:= hwRound(Me^.X);

             Rate:= RatePlace(Me);

             if Rate > BestRate then

                begin

                BestActions:= Actions;

                BestActions.isWalkingToABetterPlace:= true;

                BestRate:= Rate;

                Me^.State:= Me^.State or gstAttacked // we have better place, go there and do not use ammo

                end

            else if Rate < BestRate then

                break;

            if ((Me^.State and gstAttacked) = 0) and ((steps mod 4) = 0) then

                begin

                    break;                    

                TestAmmos(Actions, Me, true);

                end;

            if GoInfo.FallPix >= FallPixForBranching then

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

            end {while};

        if BestRate > BaseRate then

            exit

        end {while}

    end {if}

end;

function Think(Me: Pointer): ptrint;

var BackMe, WalkMe: TGear;

    switchCount: LongInt;

    StartTicks, currHedgehogIndex, itHedgehog, switchesNum, i: Longword;

    switchImmediatelyAvailable: boolean;

    Actions: TActions;

begin

InterlockedIncrement(hasThread);

StartTicks:= GameTicks;

currHedgehogIndex:= CurrentTeam^.CurrHedgehog;

itHedgehog:= currHedgehogIndex;

switchesNum:= 0;

switchImmediatelyAvailable:= (CurAmmoGear <> nil) and (CurAmmoGear^.Kind = gtSwitcher);

if PGear(Me)^.Hedgehog^.BotLevel <> 5 then

    switchCount:= HHHasAmmo(PGear(Me)^.Hedgehog^, amSwitch)

else switchCount:= 0;

if (PGear(Me)^.State and gstAttacked) = 0 then

    if Targets.Count > 0 then

        begin

        // iterate over current team hedgehogs

        repeat

            WalkMe:= CurrentTeam^.Hedgehogs[itHedgehog].Gear^;

            Actions.Count:= 0;

            Actions.Pos:= 0;

            Actions.Score:= 0;

            if switchesNum > 0 then

                begin

                if not switchImmediatelyAvailable  then

                    begin

                    // when AI has to use switcher, make it cost smth unless they have a lot of switches

                    if (switchCount < 10) then Actions.Score:= (-27+switchCount*3)*4000;

                    AddAction(Actions, aia_Weapon, Longword(amSwitch), 300 + random(200), 0, 0);                    

                    AddAction(Actions, aia_attack, aim_push, 300 + random(300), 0, 0);

                    AddAction(Actions, aia_attack, aim_release, 1, 0, 0);

                    end;

                for i:= 1 to switchesNum do

                    AddAction(Actions, aia_Switch, 0, 300 + random(200), 0, 0);

                end;

            Walk(@WalkMe, Actions);

            // find another hog in team

            repeat

                itHedgehog:= Succ(itHedgehog) mod CurrentTeam^.HedgehogsNumber;

            until (itHedgehog = currHedgehogIndex) or (CurrentTeam^.Hedgehogs[itHedgehog].Gear <> nil);

            inc(switchesNum);

        until (not (switchImmediatelyAvailable or (switchCount > 0)))

            or StopThinking 

            or (itHedgehog = currHedgehogIndex)

            or BestActions.isWalkingToABetterPlace;

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

            SDL_Delay(1000);

        if (BestActions.Score < -1023) and (not BestActions.isWalkingToABetterPlace) then

            begin

            BestActions.Count:= 0;

            AddAction(BestActions, aia_Skip, 0, 250, 0, 0);

            end;

        end else

else

    begin

    BackMe:= PGear(Me)^;

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

        begin

(*

        // Maybe this would get a bit of movement out of them? Hopefully not *toward* water. Need to check how often he'd choose that strategy

        if SuddenDeathDmg and ((hwRound(BackMe.Y)+cWaterRise*2) > cWaterLine) then

            AddBonus(hwRound(BackMe.X), hwRound(BackMe.Y), 250, -40);

*)

        FillBonuses(true);

        WalkMe:= BackMe;

        Actions.Count:= 0;

        Actions.Pos:= 0;

        Actions.Score:= 0;

        Walk(@WalkMe, Actions);

        if not StopThinking then

            SDL_Delay(100)

        end

    end;

PGear(Me)^.State:= PGear(Me)^.State and (not gstHHThinking);

Think:= 0;

InterlockedDecrement(hasThread)

end;

procedure StartThink(Me: PGear);

begin

if ((Me^.State and (gstAttacking or gstHHJumping or gstMoving)) <> 0)

or isInMultiShoot then

    exit;

//DeleteCI(Me); // this will break demo/netplay

Me^.State:= Me^.State or gstHHThinking;

Me^.Message:= 0;

BestActions.Count:= 0;

BestActions.Pos:= 0;

BestActions.Score:= Low(LongInt);

BestActions.isWalkingToABetterPlace:= false;

StopThinking:= false;

ThinkingHH:= Me;

FillTargets;

if Targets.Count = 0 then

    begin

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

    exit

    end;