(*

 * 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 uGearsUtils;

interface

uses uTypes, math;

function  ModifyDamage(dmg: Longword; Gear: PGear): Longword;

procedure ApplyDamage(Gear: PGear; AttackerHog: PHedgehog; Damage: Longword; Source: TDamageSource);

procedure spawnHealthTagForHH(HHGear: PGear; dmg: Longword);

procedure HHHurt(Hedgehog: PHedgehog; Source: TDamageSource);

procedure CheckHHDamage(Gear: PGear);

procedure CalcRotationDirAngle(Gear: PGear);

procedure ResurrectHedgehog(gear: PGear);

function  CheckGearNear(Gear: PGear; Kind: TGearType; rX, rY: LongInt): PGear;

function  CheckGearDrowning(Gear: PGear): boolean;

var doStepHandlers: array[TGearType] of TGearStepProcedure;

implementation

uses uFloat, uSound, uCollisions, uUtils, uConsts, uVisualGears, uAIMisc,

    uVariables, uLandGraphics, uScript, uStats, uCaptions, uTeams, uStore,

    uLocale, uTextures, uRenderUtils, uRandom, SDLh, uDebug, uGears,

    uGearsList;

procedure doMakeExplosion(X, Y, Radius: LongInt; AttackingHog: PHedgehog; Mask: Longword; const Tint: LongWord);

var Gear: PGear;

    dmg, dmgBase: LongInt;

    fX, fY, tdX, tdY: hwFloat;

    vg: PVisualGear;

    i, cnt: LongInt;

begin

if Radius > 4 then AddFileLog('Explosion: at (' + inttostr(x) + ',' + inttostr(y) + ')');

if Radius > 25 then KickFlakes(Radius, X, Y);

if ((Mask and EXPLNoGfx) = 0) then

    begin

    vg:= nil;

    if Radius > 50 then vg:= AddVisualGear(X, Y, vgtBigExplosion)

    else if Radius > 10 then vg:= AddVisualGear(X, Y, vgtExplosion);

    if vg <> nil then

        vg^.Tint:= Tint;

    end;

if (Mask and EXPLAutoSound) <> 0 then PlaySound(sndExplosion);

(*if (Mask and EXPLAllDamageInRadius) = 0 then

    dmgRadius:= Radius shl 1

else

    dmgRadius:= Radius;

dmgBase:= dmgRadius + cHHRadius div 2;*)

dmgBase:= Radius shl 1 + cHHRadius div 2;

fX:= int2hwFloat(X);

fY:= int2hwFloat(Y);

Gear:= GearsList;

while Gear <> nil do

    begin

    dmg:= 0;

    //dmg:= dmgRadius  + cHHRadius div 2 - hwRound(Distance(Gear^.X - int2hwFloat(X), Gear^.Y - int2hwFloat(Y)));

    //if (dmg > 1) and

    if (Gear^.State and gstNoDamage) = 0 then

        begin

        case Gear^.Kind of

            gtHedgehog,

                gtMine,

                gtBall,

                gtMelonPiece,

                gtGrenade,

                gtClusterBomb,

            //    gtCluster, too game breaking I think

                gtSMine,

                gtCase,

                gtTarget,

                gtFlame,

                gtExplosives,

                gtStructure: begin

// Run the calcs only once we know we have a type that will need damage

                        tdX:= Gear^.X-fX;

                        tdY:= Gear^.Y-fY;

                        if hwRound(hwAbs(tdX)+hwAbs(tdY)) < dmgBase then

                            dmg:= dmgBase - max(hwRound(Distance(tdX, tdY)),Gear^.Radius);

                        if dmg > 1 then

                            begin

                            dmg:= ModifyDamage(min(dmg div 2, Radius), Gear);

                            //AddFileLog('Damage: ' + inttostr(dmg));

                            if (Mask and EXPLNoDamage) = 0 then

                                begin

                                if not Gear^.Invulnerable then

                                    ApplyDamage(Gear, AttackingHog, dmg, dsExplosion)

                                else

                                    Gear^.State:= Gear^.State or gstWinner;

                                end;

                            if ((Mask and EXPLDoNotTouchAny) = 0) and (((Mask and EXPLDoNotTouchHH) = 0) or (Gear^.Kind <> gtHedgehog)) then

                                begin

                                DeleteCI(Gear);

                                Gear^.dX:= Gear^.dX + SignAs(_0_005 * dmg + cHHKick, tdX)/(Gear^.Density/_3);

                                Gear^.dY:= Gear^.dY + SignAs(_0_005 * dmg + cHHKick, tdY)/(Gear^.Density/_3);

                                Gear^.State:= (Gear^.State or gstMoving) and (not gstLoser);

                                if not Gear^.Invulnerable then

                                    Gear^.State:= (Gear^.State or gstMoving) and (not gstWinner);

                                Gear^.Active:= true;

                                if Gear^.Kind <> gtFlame then FollowGear:= Gear

                                end;

                            if ((Mask and EXPLPoisoned) <> 0) and (Gear^.Kind = gtHedgehog) and (not Gear^.Invulnerable) then

                                Gear^.Hedgehog^.Effects[hePoisoned] := true;

                            end;

                        end;

                gtGrave: begin

// Run the calcs only once we know we have a type that will need damage

                        tdX:= Gear^.X-fX;

                        tdY:= Gear^.Y-fY;

                        if hwRound(hwAbs(tdX)+hwAbs(tdY)) < dmgBase then

                            dmg:= dmgBase - hwRound(Distance(tdX, tdY));

                        if dmg > 1 then

                            begin

                            dmg:= ModifyDamage(min(dmg div 2, Radius), Gear);

                            Gear^.dY:= - _0_004 * dmg;

                            Gear^.Active:= true

                            end

                        end;

            end;

        end;

    Gear:= Gear^.NextGear

    end;

if (Mask and EXPLDontDraw) = 0 then

    if (GameFlags and gfSolidLand) = 0 then

        begin

        cnt:= DrawExplosion(X, Y, Radius) div 1608; // approx 2 16x16 circles to erase per chunk

        if (cnt > 0) and (SpritesData[sprChunk].Texture <> nil) then

            for i:= 0 to cnt do

                AddVisualGear(X, Y, vgtChunk)

        end;

uAIMisc.AwareOfExplosion(0, 0, 0)

end;

function ModifyDamage(dmg: Longword; Gear: PGear): Longword;

var i: hwFloat;

begin

(* Invulnerability cannot be placed in here due to still needing kicks

   Not without a new damage machine.

   King check should be in here instead of ApplyDamage since Tiy wants them kicked less

*)

i:= _1;

if (CurrentHedgehog <> nil) and CurrentHedgehog^.King then

    i:= _1_5;

if (Gear^.Hedgehog <> nil) and (Gear^.Hedgehog^.King) then

    ModifyDamage:= hwRound(_0_01 * cDamageModifier * dmg * i * cDamagePercent * _0_5)

else

    ModifyDamage:= hwRound(_0_01 * cDamageModifier * dmg * i * cDamagePercent)

end;

procedure ApplyDamage(Gear: PGear; AttackerHog: PHedgehog; Damage: Longword; Source: TDamageSource);

var s: shortstring;

    vampDmg, tmpDmg, i: Longword;

    vg: PVisualGear;

begin

    if Damage = 0 then

        exit; // nothing to apply

    if (Gear^.Kind = gtHedgehog) then

        begin

        Gear^.LastDamage := AttackerHog;

        Gear^.Hedgehog^.Team^.Clan^.Flawless:= false;

        HHHurt(Gear^.Hedgehog, Source);

        AddDamageTag(hwRound(Gear^.X), hwRound(Gear^.Y), Damage, Gear^.Hedgehog^.Team^.Clan^.Color);

        tmpDmg:= min(Damage, max(0,Gear^.Health-Gear^.Damage));

        if (Gear <> CurrentHedgehog^.Gear) and (CurrentHedgehog^.Gear <> nil) and (tmpDmg >= 1) then

            begin

            if cVampiric then

                begin

                vampDmg:= hwRound(int2hwFloat(tmpDmg)*_0_8);

                if vampDmg >= 1 then

                    begin

                    // was considering pulsing on attack, Tiy thinks it should be permanent while in play

                    //CurrentHedgehog^.Gear^.State:= CurrentHedgehog^.Gear^.State or gstVampiric;

                    inc(CurrentHedgehog^.Gear^.Health,vampDmg);

                    str(vampDmg, s);

                    s:= '+' + s;

                    AddCaption(s, CurrentHedgehog^.Team^.Clan^.Color, capgrpAmmoinfo);

                    RenderHealth(CurrentHedgehog^);

                    RecountTeamHealth(CurrentHedgehog^.Team);

                    i:= 0;

                    while i < vampDmg do

                        begin

                        vg:= AddVisualGear(hwRound(CurrentHedgehog^.Gear^.X), hwRound(CurrentHedgehog^.Gear^.Y), vgtStraightShot);

                        if vg <> nil then

                            with vg^ do

                                begin

                                Tint:= $FF0000FF;

                                State:= ord(sprHealth)

                                end;

                        inc(i, 5);

                        end;

                    end

                end;

        if ((GameFlags and gfKarma) <> 0) and 

        ((GameFlags and gfInvulnerable) = 0)

        and (not CurrentHedgehog^.Gear^.Invulnerable) then

            begin // this cannot just use Damage or it interrupts shotgun and gets you called stupid

            inc(CurrentHedgehog^.Gear^.Karma, tmpDmg);

            CurrentHedgehog^.Gear^.LastDamage := CurrentHedgehog;

            spawnHealthTagForHH(CurrentHedgehog^.Gear, tmpDmg);

            end;

        uStats.HedgehogDamaged(Gear, AttackerHog, Damage, false);    

        end;

    end

    else if Gear^.Kind <> gtStructure then // not gtHedgehog nor gtStructure

        begin

        Gear^.Hedgehog:= AttackerHog;

        end;

    inc(Gear^.Damage, Damage);

    ScriptCall('onGearDamage', Gear^.UID, Damage);

end;

procedure spawnHealthTagForHH(HHGear: PGear; dmg: Longword);

var tag: PVisualGear;

begin

tag:= AddVisualGear(hwRound(HHGear^.X), hwRound(HHGear^.Y), vgtHealthTag, dmg);

if (tag <> nil) then

    tag^.Hedgehog:= HHGear^.Hedgehog; // the tag needs the tag to determine the text color

AllInactive:= false;

HHGear^.Active:= true;

end;

procedure HHHurt(Hedgehog: PHedgehog; Source: TDamageSource);

begin

if (Source = dsFall) or (Source = dsExplosion) then

    case random(3) of

        0: PlaySound(sndOoff1, Hedgehog^.Team^.voicepack);

        1: PlaySound(sndOoff2, Hedgehog^.Team^.voicepack);

        2: PlaySound(sndOoff3, Hedgehog^.Team^.voicepack);

    end

else if (Source = dsPoison) then

    case random(2) of

        0: PlaySound(sndPoisonCough, Hedgehog^.Team^.voicepack);

        1: PlaySound(sndPoisonMoan, Hedgehog^.Team^.voicepack);

    end

else

    case random(4) of

        0: PlaySound(sndOw1, Hedgehog^.Team^.voicepack);

        1: PlaySound(sndOw2, Hedgehog^.Team^.voicepack);

        2: PlaySound(sndOw3, Hedgehog^.Team^.voicepack);

        3: PlaySound(sndOw4, Hedgehog^.Team^.voicepack);

    end

end;

procedure CheckHHDamage(Gear: PGear);

var 

    dmg: Longword;

    i: LongInt;

    particle: PVisualGear;

begin

    if _0_4 < Gear^.dY then

        begin

        dmg := ModifyDamage(1 + hwRound((hwAbs(Gear^.dY) - _0_4) * 70), Gear);

        PlaySound(sndBump);

        if dmg < 1 then

            exit;

        for i:= min(12, (3 + dmg div 10)) downto 0 do

            begin

            particle := AddVisualGear(hwRound(Gear^.X) - 5 + Random(10), hwRound(Gear^.Y) + 12, vgtDust);

            if particle <> nil then

                particle^.dX := particle^.dX + (Gear^.dX.QWordValue / 21474836480);

            end;

        if (Gear^.Invulnerable) then

            exit;

        //if _0_6 < Gear^.dY then

        //    PlaySound(sndOw4, Gear^.Hedgehog^.Team^.voicepack)

        //else

        //    PlaySound(sndOw1, Gear^.Hedgehog^.Team^.voicepack);

        if Gear^.LastDamage <> nil then

            ApplyDamage(Gear, Gear^.LastDamage, dmg, dsFall)

        else

            ApplyDamage(Gear, CurrentHedgehog, dmg, dsFall);

    end

end;

procedure CalcRotationDirAngle(Gear: PGear);

var 

    dAngle: real;

begin

    dAngle := (Gear^.dX.QWordValue + Gear^.dY.QWordValue) / $80000000;

    if not Gear^.dX.isNegative then

        Gear^.DirAngle := Gear^.DirAngle + dAngle

    else

        Gear^.DirAngle := Gear^.DirAngle - dAngle;

    if Gear^.DirAngle < 0 then

        Gear^.DirAngle := Gear^.DirAngle + 360

    else if 360 < Gear^.DirAngle then

        Gear^.DirAngle := Gear^.DirAngle - 360

end;

function CheckGearDrowning(Gear: PGear): boolean;

var 

    skipSpeed, skipAngle, skipDecay: hwFloat;

    i, maxDrops, X, Y: LongInt;

    vdX, vdY: real;

    particle, splash: PVisualGear;

    isSubmersible: boolean;

begin

    // probably needs tweaking. might need to be in a case statement based upon gear type

    Y:= hwRound(Gear^.Y);

    if cWaterLine < Y + Gear^.Radius then

        begin

        isSubmersible:= (Gear = CurrentHedgehog^.Gear) and (CurAmmoGear <> nil) and (CurAmmoGear^.AmmoType = amJetpack);

        skipSpeed := _0_25;

        skipAngle := _1_9;

        skipDecay := _0_87;

        X:= hwRound(Gear^.X);

        vdX:= hwFloat2Float(Gear^.dX);

        vdY:= hwFloat2Float(Gear^.dY);

        // this could perhaps be a tiny bit higher.

        if  (hwSqr(Gear^.dX) + hwSqr(Gear^.dY) > skipSpeed)

        and (hwAbs(Gear^.dX) > skipAngle * hwAbs(Gear^.dY)) then

            begin

            Gear^.dY.isNegative := true;

            Gear^.dY := Gear^.dY * skipDecay;

            Gear^.dX := Gear^.dX * skipDecay;

            CheckGearDrowning := false;

            PlaySound(sndSkip)

            end

        else

            begin

            if not isSubmersible then

                begin

                CheckGearDrowning := true;

                Gear^.State := gstDrowning;

                Gear^.RenderTimer := false;

                if (Gear^.Kind <> gtSniperRifleShot) and (Gear^.Kind <> gtShotgunShot)

                and (Gear^.Kind <> gtDEagleShot) and (Gear^.Kind <> gtSineGunShot) then

                    if Gear^.Kind = gtHedgehog then

                        begin

                        if Gear^.Hedgehog^.Effects[heResurrectable] then

                            ResurrectHedgehog(Gear)

                        else

                            begin

                            Gear^.doStep := @doStepDrowningGear;

                            Gear^.State := Gear^.State and (not gstHHDriven);

                            AddCaption(Format(GetEventString(eidDrowned), Gear^.Hedgehog^.Name), cWhiteColor, capgrpMessage);

                            end

                        end

                    else

                        Gear^.doStep := @doStepDrowningGear;

                        if Gear^.Kind = gtFlake then

                            exit // skip splashes 

                end;

            if ((not isSubmersible) and (Y < cWaterLine + 64 + Gear^.Radius))

            or (isSubmersible and (Y < cWaterLine + 2 + Gear^.Radius) and ((CurAmmoGear^.Pos = 0)

            and (CurAmmoGear^.dY < _0_01))) then

                if Gear^.Density * Gear^.dY > _1 then

                    PlaySound(sndSplash)

                else if Gear^.Density * Gear^.dY > _0_5 then 

                    PlaySound(sndSkip)

                else

                    PlaySound(sndDroplet2);

            end;

        if ((cReducedQuality and rqPlainSplash) = 0)

        and (((not isSubmersible) and (Y < cWaterLine + 64 + Gear^.Radius))

        or (isSubmersible and (Y < cWaterLine + 2 + Gear^.Radius) and ((CurAmmoGear^.Pos = 0)

        and (CurAmmoGear^.dY < _0_01)))) then

            begin

            splash:= AddVisualGear(X, cWaterLine, vgtSplash);

            if splash <> nil then 

                begin

                splash^.Scale:= hwFloat2Float(Gear^.Density / _3 * Gear^.dY);

                if splash^.Scale > 1 then splash^.Scale:= power(splash^.Scale,0.3333)

                else splash^.Scale:= splash^.Scale + ((1-splash^.Scale) / 2);

                end;

            maxDrops := (hwRound(Gear^.Density) * 3) div 2 + round(vdX * hwRound(Gear^.Density) * 6) + round(vdY * hwRound(Gear^.Density) * 6);

            for i:= max(maxDrops div 3, min(32, Random(maxDrops))) downto 0 do

                begin

                particle := AddVisualGear(X - 3 + Random(6), cWaterLine, vgtDroplet);

                if particle <> nil then

                    begin

                    particle^.dX := particle^.dX - vdX / 10;

                    particle^.dY := particle^.dY - vdY / 5;

                    if splash <> nil then

                        begin

                        if splash^.Scale > 1 then 

                            begin

                            particle^.dX:= particle^.dX * power(splash^.Scale,0.3333); // tone down the droplet height further

                            particle^.dY:= particle^.dY * power(splash^.Scale, 0.3333)

                            end

                        else 

                            begin

                            particle^.dX:= particle^.dX * splash^.Scale;

                            particle^.dY:= particle^.dY * splash^.Scale

                            end

                        end

                    end

                end

            end;

        if isSubmersible and (CurAmmoGear^.Pos = 0) then

            CurAmmoGear^.Pos := 1000

        end

    else

        CheckGearDrowning := false;

end;

procedure ResurrectHedgehog(gear: PGear);

var tempTeam : PTeam;

begin

    AttackBar:= 0;

    gear^.dX := _0;

    gear^.dY := _0;

    gear^.Damage := 0;

    gear^.Health := gear^.Hedgehog^.InitialHealth;

    gear^.Hedgehog^.Effects[hePoisoned] := false;

    if not CurrentHedgehog^.Effects[heResurrectable] then

        with CurrentHedgehog^ do 

            begin

            inc(Team^.stats.AIKills);

            FreeTexture(Team^.AIKillsTex);

            Team^.AIKillsTex := RenderStringTex(inttostr(Team^.stats.AIKills), Team^.Clan^.Color, fnt16);

            end;

    tempTeam := gear^.Hedgehog^.Team;

    DeleteCI(gear);

    FindPlace(gear, false, 0, LAND_WIDTH, true); 

    if gear <> nil then

        begin

        RenderHealth(gear^.Hedgehog^);

        ScriptCall('onGearResurrect', gear^.uid);

        gear^.State := gstWait;

    end;

    RecountTeamHealth(tempTeam);

end;

function CountNonZeroz(x, y, r, c: LongInt): LongInt;

var i: LongInt;

    count: LongInt = 0;

begin

if (y and LAND_HEIGHT_MASK) = 0 then

    for i:= max(x - r, 0) to min(x + r, LAND_WIDTH - 4) do

        if Land[y, i] <> 0 then

            begin

            inc(count);

            if count = c then

                exit(count)

            end;

CountNonZeroz:= count;

end;

function NoGearsToAvoid(mX, mY: LongInt; rX, rY: LongInt): boolean;

var t: PGear;

begin

t:= GearsList;

rX:= sqr(rX);

rY:= sqr(rY);