(*
 * Hedgewars, a free turn based strategy game
 * Copyright (c) 2005-2011 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 uAIMisc;
interface
uses SDLh, uConsts, uFloat, uTypes;

const MAXBONUS = 1024;

type TTarget = record
    Point: TPoint;
    Score: LongInt;
    end;
TTargets = record
    Count: Longword;
    ar: array[0..Pred(cMaxHHs)] of TTarget;
    end;
TJumpType = (jmpNone, jmpHJump, jmpLJump);
TGoInfo = record
    Ticks: Longword;
    FallPix: Longword;
    JumpType: TJumpType;
    end;
TBonus = record
    X, Y: LongInt;
    Radius: LongInt;
    Score: LongInt;
    end;

procedure initModule;
procedure freeModule;

procedure FillTargets;
procedure FillBonuses(isAfterAttack: boolean; filter: TGearsType = []);
procedure AwareOfExplosion(x, y, r: LongInt);
function RatePlace(Gear: PGear): LongInt;
function TestCollExcludingMe(Me: PGear; x, y, r: LongInt): boolean;
function TestColl(x, y, r: LongInt): boolean;
function RateExplosion(Me: PGear; x, y, r: LongInt): LongInt;
function RateShove(Me: PGear; x, y, r, power: LongInt): LongInt;
function RateShotgun(Me: PGear; x, y: LongInt): LongInt;
function RateHammer(Me: PGear): LongInt;
function HHGo(Gear, AltGear: PGear; var GoInfo: TGoInfo): boolean;
function AIrndSign(num: LongInt): LongInt;

var ThinkingHH: PGear;
    Targets: TTargets;

    bonuses: record
        Count: Longword;
        ar: array[0..Pred(MAXBONUS)] of TBonus;
        end;

implementation
uses uCollisions, uVariables, uUtils, uDebug;

const KillScore = 200;

var friendlyfactor: LongInt = 300;
    KnownExplosion: record
        X, Y, Radius: LongInt
        end = (X: 0; Y: 0; Radius: 0);

procedure FillTargets;
var i, t: Longword;
    f, e: LongInt;
begin
Targets.Count:= 0;
f:= 0;
e:= 0;
for t:= 0 to Pred(TeamsCount) do
    with TeamsArray[t]^ do
        if not hasGone then
            begin
            for i:= 0 to cMaxHHIndex do
                if (Hedgehogs[i].Gear <> nil)
                and (Hedgehogs[i].Gear <> ThinkingHH) then
                    begin
                    with Targets.ar[Targets.Count], Hedgehogs[i] do
                        begin
                        Point.X:= hwRound(Gear^.X);
                        Point.Y:= hwRound(Gear^.Y);
                        if Clan <> CurrentTeam^.Clan then
                            begin
                            Score:=  Gear^.Health;
                            inc(e)
                            end else
                            begin
                            Score:= -Gear^.Health;
                            inc(f)
                            end
                        end;
                    inc(Targets.Count)
                    end;
            end;

if e > f then friendlyfactor:= 300 + (e - f) * 30
else friendlyfactor:= max(30, 300 - f * 80 div max(1,e))
end;

procedure AddBonus(x, y: LongInt; r: Longword; s: LongInt);
begin
bonuses.ar[bonuses.Count].x:= x;
bonuses.ar[bonuses.Count].y:= y;
bonuses.ar[bonuses.Count].Radius:= r;
bonuses.ar[bonuses.Count].Score:= s;
inc(bonuses.Count);
TryDo(bonuses.Count <= MAXBONUS, 'Bonuses overflow', true)
end;

procedure FillBonuses(isAfterAttack: boolean; filter: TGearsType);
var Gear: PGear;
    MyClan: PClan;
begin
bonuses.Count:= 0;
MyClan:= ThinkingHH^.Hedgehog^.Team^.Clan;
Gear:= GearsList;
while Gear <> nil do
    begin
    if (filter = []) or (Gear^.Kind in filter) then
        case Gear^.Kind of
            gtCase:
            AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 33, 25);
            gtFlame:
                if (Gear^.State and gsttmpFlag) <> 0 then
                    AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 20, -50);
// avoid mines unless they are very likely to be duds, or are duds. also avoid if they are about to blow 
            gtMine:
                if ((Gear^.State and gstAttacking) = 0) and (((cMineDudPercent < 90) and (Gear^.Health <> 0))
                or (isAfterAttack and (Gear^.Health = 0) and (Gear^.Damage > 30))) then
                    AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 50, -50)
                else if (Gear^.State and gstAttacking) <> 0 then
                    AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 100, -50); // mine is on
                    
            gtExplosives:
            if isAfterAttack then
                AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 75, -60+Gear^.Health);
                
            gtSMine:
                AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 50, -30);
                
            gtDynamite:
                AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 150, -75);
                
            gtHedgehog:
                begin
                if Gear^.Damage >= Gear^.Health then
                    AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 60, -25)
                else
                    if isAfterAttack and (ThinkingHH^.Hedgehog <> Gear^.Hedgehog) then
                        if (ClansCount > 2) or (MyClan = Gear^.Hedgehog^.Team^.Clan) then
                            AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 150, -3) // hedgehog-friend
                        else
                            AddBonus(hwRound(Gear^.X), hwRound(Gear^.Y), 100, 3)
                end;
            end;
    Gear:= Gear^.NextGear
    end;
if isAfterAttack and (KnownExplosion.Radius > 0) then
    with KnownExplosion do
        AddBonus(X, Y, Radius + 10, -Radius);
end;

procedure AwareOfExplosion(x, y, r: LongInt);
begin
KnownExplosion.X:= x;
KnownExplosion.Y:= y;
KnownExplosion.Radius:= r
end;

function RatePlace(Gear: PGear): LongInt;
var i, r: LongInt;
    rate: LongInt;
begin
rate:= 0;
for i:= 0 to Pred(bonuses.Count) do
    with bonuses.ar[i] do
        begin
        r:= hwRound(Distance(Gear^.X - int2hwFloat(X), Gear^.Y - int2hwFloat(Y)));
        if r < Radius then
            inc(rate, Score * (Radius - r))
        end;
    RatePlace:= rate;
end;

// Wrapper to test various approaches.  If it works reasonably, will just replace.
// Right now, converting to hwFloat is a tad inefficient since the x/y were hwFloat to begin with...
function TestCollExcludingMe(Me: PGear; x, y, r: LongInt): boolean;
var MeX, MeY: LongInt;
begin
    if ((x and LAND_WIDTH_MASK) = 0) and ((y and LAND_HEIGHT_MASK) = 0) then
        begin
        MeX:= hwRound(Me^.X);
        MeY:= hwRound(Me^.Y);
        // We are still inside the hog. Skip radius test
        if ((((x-MeX)*(x-MeX)) + ((y-MeY)*(y-MeY))) < 256) and ((Land[y, x] and $FF00) = 0) then
            exit(false);
        end;
    exit(TestColl(x, y, r))
end;

function TestColl(x, y, r: LongInt): boolean;
var b: boolean;
begin
b:= (((x-r) and LAND_WIDTH_MASK) = 0)and(((y-r) and LAND_HEIGHT_MASK) = 0) and (Land[y-r, x-r] <> 0);
if b then
    exit(true);
    
b:=(((x-r) and LAND_WIDTH_MASK) = 0)and(((y+r) and LAND_HEIGHT_MASK) = 0) and (Land[y+r, x-r] <> 0);
if b then
    exit(true);
    
b:=(((x+r) and LAND_WIDTH_MASK) = 0)and(((y-r) and LAND_HEIGHT_MASK) = 0) and (Land[y-r, x+r] <> 0);
if b then
    exit(true);
    
TestColl:=(((x+r) and LAND_WIDTH_MASK) = 0)and(((y+r) and LAND_HEIGHT_MASK) = 0) and (Land[y+r, x+r] <> 0)
end;

function RateExplosion(Me: PGear; x, y, r: LongInt): LongInt;
var i, dmg, rate: LongInt;
begin
rate:= 0;
// add our virtual position
with Targets.ar[Targets.Count] do
    begin
    Point.x:= hwRound(Me^.X);
    Point.y:= hwRound(Me^.Y);
    Score:= - ThinkingHH^.Health
    end;
// rate explosion
for i:= 0 to Targets.Count do
    with Targets.ar[i] do
        begin
        dmg:= hwRound(_0_01 * cDamageModifier * min((r + cHHRadius div 2 - LongInt(DistanceI(Point.x - x, Point.y - y).Round)) div 2, r) * cDamagePercent);

        if dmg > 0 then
            begin
            if dmg >= abs(Score) then
                if Score > 0 then
                    inc(rate, KillScore)
                else
                    dec(rate, KillScore * friendlyfactor div 100)
            else
                if Score > 0 then
                    inc(rate, dmg)
            else
                dec(rate, dmg * friendlyfactor div 100)
            end;
        end;
RateExplosion:= rate * 1024;
end;

function RateShove(Me: PGear; x, y, r, power: LongInt): LongInt;
var i, dmg, rate: LongInt;
begin
Me:= Me; // avoid compiler hint
rate:= 0;
for i:= 0 to Pred(Targets.Count) do
    with Targets.ar[i] do
        begin
        dmg:= r - hwRound(DistanceI(Point.x - x, Point.y - y));
        dmg:= hwRound(_0_01 * cDamageModifier * dmg * cDamagePercent);
        if dmg > 0 then
            begin
            if power >= abs(Score) then
                if Score > 0 then
                    inc(rate, KillScore)
                else
                    dec(rate, KillScore * friendlyfactor div 100)
            else
                if Score > 0 then
                    inc(rate, power)
                else
                    dec(rate, power * friendlyfactor div 100)
            end;
        end;
RateShove:= rate * 1024
end;

function RateShotgun(Me: PGear; x, y: LongInt): LongInt;
var i, dmg, rate: LongInt;
begin
rate:= 0;
// add our virtual position
with Targets.ar[Targets.Count] do
    begin
    Point.x:= hwRound(Me^.X);
    Point.y:= hwRound(Me^.Y);
    Score:= - ThinkingHH^.Health
    end;
// rate shot
for i:= 0 to Targets.Count do
    with Targets.ar[i] do
        begin
        dmg:= min(cHHRadius + cShotgunRadius + 4 - hwRound(DistanceI(Point.x - x, Point.y - y)), 25);
        dmg:= hwRound(_0_01 * cDamageModifier * dmg * cDamagePercent);
        if dmg > 0 then
            begin
                if dmg >= abs(Score) then
                    dmg := KillScore;
                if Score > 0 then
                    inc(rate, dmg)
                else
                    dec(rate, dmg * friendlyfactor div 100);
            end;
        end;        
RateShotgun:= rate * 1024;
end;

function RateHammer(Me: PGear): LongInt;
var x, y, i, r, rate: LongInt;
begin
// hammer hit shift against attecker hog is 10
x:= hwRound(Me^.X) + hwSign(Me^.dX) * 10;
y:= hwRound(Me^.Y);
rate:= 0;

for i:= 0 to Pred(Targets.Count) do
    with Targets.ar[i] do
        begin
         // hammer hit radius is 8, shift is 10
        r:= hwRound(DistanceI(Point.x - x, Point.y - y));

        if r <= 18 then
            if Score > 0 then 
                inc(rate, Score div 3)
            else 
                inc(rate, Score div 3 * friendlyfactor div 100)
        end;
RateHammer:= rate * 1024;
end;

function HHJump(Gear: PGear; JumpType: TJumpType; var GoInfo: TGoInfo): boolean;
var bX, bY: LongInt;
    bRes: boolean;
begin
bRes:= false;
GoInfo.Ticks:= 0;
GoInfo.JumpType:= jmpNone;
bX:= hwRound(Gear^.X);
bY:= hwRound(Gear^.Y);
case JumpType of
    jmpNone:
    exit(bRes);
    
    jmpHJump:
    if TestCollisionYwithGear(Gear, -1) = 0 then
        begin
        Gear^.dY:= -_0_2;
        SetLittle(Gear^.dX);
        Gear^.State:= Gear^.State or gstMoving or gstHHJumping;
        end
    else
        exit(bRes);
        
    jmpLJump:
    begin
    if TestCollisionYwithGear(Gear, -1) <> 0 then
          if not TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX)) then
            Gear^.Y:= Gear^.Y - int2hwFloat(2)
        else
            if not TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX)) then
                Gear^.Y:= Gear^.Y - _1;
        if not (TestCollisionXwithGear(Gear, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            begin
            Gear^.dY:= -_0_15;
            Gear^.dX:= SignAs(_0_15, Gear^.dX);
            Gear^.State:= Gear^.State or gstMoving or gstHHJumping
            end
        else
            exit(bRes)
    end
    end;

repeat
    if not (hwRound(Gear^.Y) + cHHRadius < cWaterLine) then
        exit(bRes);
    if (Gear^.State and gstMoving) <> 0 then
        begin
        if (GoInfo.Ticks = 350) then
            if (not (hwAbs(Gear^.dX) > cLittle)) and (Gear^.dY < -_0_02) then
                begin
                Gear^.dY:= -_0_25;
                Gear^.dX:= SignAs(_0_02, Gear^.dX)
                end;
    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then SetLittle(Gear^.dX);
        Gear^.X:= Gear^.X + Gear^.dX;
    inc(GoInfo.Ticks);
    Gear^.dY:= Gear^.dY + cGravity;
    if Gear^.dY > _0_4 then
        exit(bRes);
    if (Gear^.dY.isNegative)and (TestCollisionYwithGear(Gear, -1) <> 0) then
        Gear^.dY:= _0;
    Gear^.Y:= Gear^.Y + Gear^.dY;
    if (not Gear^.dY.isNegative)and (TestCollisionYwithGear(Gear, 1) <> 0) then
        begin
        Gear^.State:= Gear^.State and not (gstMoving or gstHHJumping);
        Gear^.dY:= _0;
        case JumpType of
            jmpHJump:
            if bY - hwRound(Gear^.Y) > 5 then
                begin
                bRes:= true;
                GoInfo.JumpType:= jmpHJump;
                inc(GoInfo.Ticks, 300 + 300) // 300 before jump, 300 after
                end;
            jmpLJump: if abs(bX - hwRound(Gear^.X)) > 30 then
                begin
                bRes:= true;
                GoInfo.JumpType:= jmpLJump;
                inc(GoInfo.Ticks, 300 + 300) // 300 before jump, 300 after
                end
                end;
            exit(bRes)
            end;
        end;
until false
end;

function HHGo(Gear, AltGear: PGear; var GoInfo: TGoInfo): boolean;
var pX, pY: LongInt;
begin
AltGear^:= Gear^;

GoInfo.Ticks:= 0;
GoInfo.FallPix:= 0;
GoInfo.JumpType:= jmpNone;
repeat
pX:= hwRound(Gear^.X);
pY:= hwRound(Gear^.Y);
if pY + cHHRadius >= cWaterLine then
    exit(false);
if (Gear^.State and gstMoving) <> 0 then
    begin
    inc(GoInfo.Ticks);
    Gear^.dY:= Gear^.dY + cGravity;
    if Gear^.dY > _0_4 then
        begin
        Goinfo.FallPix:= 0;
        HHJump(AltGear, jmpLJump, GoInfo); // try ljump instead of fall with damage
        exit(false)
        end;
    Gear^.Y:= Gear^.Y + Gear^.dY;
    if hwRound(Gear^.Y) > pY then
        inc(GoInfo.FallPix);
    if TestCollisionYwithGear(Gear, 1) <> 0 then
        begin
        inc(GoInfo.Ticks, 410);
        Gear^.State:= Gear^.State and not (gstMoving or gstHHJumping);
        Gear^.dY:= _0;
        HHJump(AltGear, jmpLJump, GoInfo); // try ljump instead of fall
        exit(true)
        end;
    continue
    end;
    if (Gear^.Message and gmLeft  )<>0 then
        Gear^.dX:= -cLittle
    else
        if (Gear^.Message and gmRight )<>0 then
             Gear^.dX:=  cLittle
        else
                exit(false);
    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then
        begin
        if not (TestCollisionXwithXYShift(Gear, _0, -6, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
            
        if not (TestCollisionXwithXYShift(Gear, _0, -5, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
            
        if not (TestCollisionXwithXYShift(Gear, _0, -4, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
            
        if not (TestCollisionXwithXYShift(Gear, _0, -3, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
        if not (TestCollisionXwithXYShift(Gear, _0, -2, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
            
        if not (TestCollisionXwithXYShift(Gear, _0, -1, hwSign(Gear^.dX))
        or (TestCollisionYwithGear(Gear, -1) <> 0)) then
            Gear^.Y:= Gear^.Y - _1;
        end;

    if not TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then
        begin
        Gear^.X:= Gear^.X + int2hwFloat(hwSign(Gear^.dX));
        inc(GoInfo.Ticks, cHHStepTicks)
        end;
        
    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y + _1;
        
    if TestCollisionYwithGear(Gear, 1) = 0 then
          begin
        Gear^.Y:= Gear^.Y + _1;
        
    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y + _1;

    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y + _1;

    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y + _1;

    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y + _1;

    if TestCollisionYwithGear(Gear, 1) = 0 then
        begin
        Gear^.Y:= Gear^.Y - _6;
        Gear^.dY:= _0;
        Gear^.State:= Gear^.State or gstMoving
        end
    end
    end
    end
    end
    end
    end;
if (pX <> hwRound(Gear^.X)) and ((Gear^.State and gstMoving) = 0) then
    exit(true);
until (pX = hwRound(Gear^.X)) and (pY = hwRound(Gear^.Y)) and ((Gear^.State and gstMoving) = 0);
HHJump(AltGear, jmpHJump, GoInfo);
HHGo:= false;
end;

function AIrndSign(num: LongInt): LongInt;
begin
if random(2) = 0 then
    AIrndSign:=   num
else
    AIrndSign:= - num
end;

procedure initModule;
begin
    friendlyfactor:= 300;
    KnownExplosion.X:= 0;
    KnownExplosion.Y:= 0;
    KnownExplosion.Radius:= 0;
end;

procedure freeModule;
begin

end;

end.