(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2007 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 uTriggers;

interface

uses SDLh, uConsts;

const trigTurns = $80000001;

type TTrigAction = (taSpawnGear, taSuccessFinish, taFailFinish);

procedure AddTriggerSpawner(id, Ticks, Lives: Longword; GearType: TGearType; X, Y: LongInt; GearTriggerId: Longword);

procedure AddTriggerSuccess(id, Ticks, Lives: Longword);

procedure AddTriggerFail(id, Ticks, Lives: Longword);

procedure TickTrigger(id: Longword);

implementation

uses uGears, uFloat, uMisc, uWorld;

type PTrigger = ^TTrigger;

     TTrigger = record

                id: Longword;

                Ticks: Longword;

                Lives: Longword;

                TicksPerLife: LongWord;

                Action: TTrigAction;

                X, Y: LongInt;

                SpawnGearType: TGearType;

                SpawnGearTriggerId: Longword;

                Next: PTrigger;

                end;

var TriggerList: PTrigger = nil;

function AddTrigger(id, Ticks, Lives: Longword): PTrigger;

var tmp: PTrigger;

begin

new(tmp);

FillChar(tmp^, sizeof(TTrigger), 0);

tmp^.id:= id;

tmp^.Ticks:= Ticks;

tmp^.TicksPerLife:= Ticks;

tmp^.Lives:= Lives;

if TriggerList <> nil then tmp^.Next:= TriggerList;

TriggerList:= tmp;

AddTrigger:= tmp

end;

procedure AddTriggerSpawner(id, Ticks, Lives: Longword; GearType: TGearType; X, Y: LongInt; GearTriggerId: Longword);

var tmp: PTrigger;

begin

if (Ticks = 0) or (Lives = 0) then exit;

tmp:= AddTrigger(id, Ticks, Lives);

tmp^.Action:= taSpawnGear;

tmp^.X:= X;

tmp^.Y:= Y;

tmp^.SpawnGearType:= GearType;

tmp^.SpawnGearTriggerId:= GearTriggerId

end;

procedure AddTriggerSuccess(id, Ticks, Lives: Longword);

begin

with AddTrigger(id, Ticks, Lives)^ do

     Action:= taSuccessFinish

end;

procedure AddTriggerFail(id, Ticks, Lives: Longword);

begin

with AddTrigger(id, Ticks, Lives)^ do

     Action:= taFailFinish

end;

procedure TickTriggerT(Trigger: PTrigger);

begin

{$IFDEF DEBUGFILE}AddFileLog('Tick trigger (type: ' + inttostr(LongWord(Trigger^.Action)) + ')');{$ENDIF}

with Trigger^ do

  case Action of

     taSpawnGear: begin

                  FollowGear:= AddGear(X, Y, SpawnGearType, 0, _0, _0, 0);

                  FollowGear^.TriggerId:= SpawnGearTriggerId

                  end;

 taSuccessFinish: begin

                  GameState:= gsExit

                  end;

    taFailFinish: begin

                  GameState:= gsExit

                  end

  end

end;

procedure TickTrigger(id: Longword);

var t, pt, nt: PTrigger;

begin

t:= TriggerList;

pt:= nil;

while (t <> nil) do

  begin

  nt:= t^.Next;

  if (t^.id = id) then

    begin

    dec(t^.Ticks);

    if (t^.Ticks = 0) then

       begin

       TickTriggerT(t);

       dec(t^.Lives);

       t^.Ticks:= t^.TicksPerLife;

       if (t^.Lives = 0) then

          begin

          if t = TriggerList then

             begin

             TriggerList:= nt;

             Dispose(t)

             end

          else

             begin

             pt^.Next:= nt;

             Dispose(t);

             t:= pt

             end

          end

       end

    end;

  pt:= t;

  t:= nt

  end

end;