/*
   Copyright (C) Prikol Software 1996-1997
   Copyright (C) Aleksey Volynskov 1996-1997
   Copyright (C) <ARembo@gmail.com> 2011

   This file is part of the Doom2D:Rembo project.

   Doom2D:Rembo is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation.

   Doom2D:Rembo 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, see <http://www.gnu.org/licenses/> or
   write to the Free Software Foundation, Inc.,
   51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
*/

#include "glob.h"
#include <stdlib.h>
#include "error.h"
#include "view.h"
#include "items.h"
#include "fx.h"
#include "player.h"
#include "monster.h"
#include "things.h"
#include "misc.h"
#include "map.h"
#include "my.h"
#include "files.h"
#include "game.h"
item_t it[MAXITEM];

static void *snd[4];
static int tsndtm, rsndtm;

int itm_rtime = 1092;

void IT_savegame (FILE *h) {
  int i, n;
  for (n = MAXITEM - 1; n >= 0 && it[n].t == 0; n--) {
    // empty
  }
  n += 1;
  myfwrite32(n, h);
  for (i = 0; i < n; i++) {
    myfwrite32(it[i].o.x, h);
    myfwrite32(it[i].o.y, h);
    myfwrite32(it[i].o.xv, h);
    myfwrite32(it[i].o.yv, h);
    myfwrite32(it[i].o.vx, h);
    myfwrite32(it[i].o.vy, h);
    myfwrite32(it[i].o.r, h);
    myfwrite32(it[i].o.h, h);
    myfwrite32(it[i].t, h);
    myfwrite32(it[i].s, h);
  }
  myfwrite32(itm_rtime, h);
}

void IT_loadgame (FILE *h) {
  int i, n;
  n = myfread32(h);
  for (i = 0; i < n; i++) {
    it[i].o.x = myfread32(h);
    it[i].o.y = myfread32(h);
    it[i].o.xv = myfread32(h);
    it[i].o.yv = myfread32(h);
    it[i].o.vx = myfread32(h);
    it[i].o.vy = myfread32(h);
    it[i].o.r = myfread32(h);
    it[i].o.h = myfread32(h);
    it[i].t = myfread32(h);
    it[i].s = myfread32(h);
  }
  itm_rtime = myfread32(h);
}

void IT_alloc (void) {
  int i, j, n;
  static char nm[][6] = {
    "ITEMUP", "WPNUP", "GETPOW", "ITMBK"
  };
  for (i = 0; i < 4; ++i) {
    snd[i] = Z_getsnd(nm[i]);
  }
  for (i = 0; i < MAXITEM; ++i) {
    it[i].o.r = 10;
    it[i].o.h = 8;
  }
}

void IT_init (void) {
  int i;
  for (i = 0; i < MAXITEM; ++i) {
    it[i].t = I_NONE;
    it[i].o.xv = 0;
    it[i].o.yv = 0;
    it[i].o.vx = 0;
    it[i].o.vy = 0;
  }
  tsndtm = 0;
  rsndtm = 0;
}

int IT_load (FILE *h) {
  int m, i, j;
  old_thing_t t;
  switch (blk.t) {
	case MB_THING:
	  for (i = 0; blk.sz > 0; ++i, blk.sz -= 8) {
      t.x = myfread16(h);
      t.y = myfread16(h);
      t.t = myfread16(h);
      t.f = myfread16(h);
      it[i].o.x = t.x;
      it[i].o.y = t.y;
      it[i].t = t.t;
      it[i].s = t.f;
      if (it[i].t && (it[i].s & THF_DM) && !g_dm) {
        it[i].t=0;
      }
	  }
    m = i;
	  for (i = 0, j = -1; i < m; ++i) {
      if (it[i].t == TH_PLR1) {
        j = i;
        it[i].t = 0;
      }
    }
	  if (!g_dm) {
      if (j == -1) {
        ERR_fatal("Предмет игрок_1 не найден");
      }
      dm_pos[0].x = it[j].o.x;
      dm_pos[0].y = it[j].o.y;
      dm_pos[0].d = it[j].s & THF_DIR;
	  }
	  for (i = 0, j = -1; i < m; ++i) {
      if (it[i].t == TH_PLR2) {
        j = i;
        it[i].t = 0;
      }
    }
	  if (!g_dm && _2pl) {
      if (j == -1) {
        ERR_fatal("Предмет игрок_2 не найден");
      }
      dm_pos[1].x = it[j].o.x;
      dm_pos[1].y = it[j].o.y;
      dm_pos[1].d = it[j].s & THF_DIR;
	  }
	  for (i = 0, j = 0; i < m; ++i) {
      if (it[i].t == TH_DMSTART) {
        if (g_dm) {
          dm_pos[j].x = it[i].o.x;
          dm_pos[j].y = it[i].o.y;
          dm_pos[j].d = it[i].s & THF_DIR;
        }
        it[i].t = 0;
        ++j;
      }
    }
	  if (g_dm && j < 2) {
      ERR_fatal("Меньше 2-ух точек DM");
    }
	  if (g_dm) {
	    dm_pnum = j;
	    dm_pl1p = myrand(dm_pnum);
	    do {
        dm_pl2p = myrand(dm_pnum);
      } while (dm_pl2p == dm_pl1p);
	  } else {
      dm_pl1p = 0;
      dm_pl2p = 1;
      dm_pnum = 2;
    }
	  PL_spawn(&pl1, dm_pos[dm_pl1p].x, dm_pos[dm_pl1p].y, dm_pos[dm_pl1p].d);
	  if (_2pl) {
      PL_spawn(&pl2, dm_pos[dm_pl2p].x, dm_pos[dm_pl2p].y, dm_pos[dm_pl2p].d);
    }
	  for (i = 0; i < m; ++i) {
      if (it[i].t >= TH_CLIP && it[i].t < TH_DEMON) {
        it[i].s = 0;
        it[i].t = it[i].t - TH_CLIP + I_CLIP;
        if (it[i].t >= I_KEYR && it[i].t <= I_KEYB) {
          it[i].t |= 0x8000;
        }
      } else if (it[i].t >= TH_DEMON) {
        MN_spawn(it[i].o.x, it[i].o.y, it[i].s & THF_DIR, it[i].t - TH_DEMON + MN_DEMON);
        it[i].t = 0;
      }
    }
	  return 1;
  }
  return 0;
}

static void takesnd (int t) {
  if(tsndtm) return;
  t&=0x7FFF;
  if(t<=I_CELP || (t>=I_BPACK && t<=I_BFG) || t==I_GUN2)
    {tsndtm=Z_sound(snd[1],128);return;}
  if(t==I_MEGA || t==I_INVL || t==I_SUPER)
    {tsndtm=Z_sound(snd[2],192);return;}
  tsndtm=Z_sound(snd[0], 255);
}

void IT_act (void) {
  int i,j;

  if(tsndtm) --tsndtm;
  if(rsndtm) --rsndtm;
  for(i=0;i<MAXITEM;++i) if(it[i].t)
    if(it[i].s<0) {
      if(++it[i].s==-8) {
		FX_ifog(it[i].o.x,it[i].o.y);
		if(!rsndtm) rsndtm=Z_sound(snd[3],128);
	  }
	}else{
	  switch(it[i].t) {
		case I_ARM1: case I_ARM2:
		  if(++it[i].s>=18) it[i].s=0; break;
		case I_MEGA: case I_INVL:
		case I_SUPER: case I_RTORCH: case I_GTORCH: case I_BTORCH:
		  if(++it[i].s>=8) it[i].s=0; break;
		case I_GOR1: case I_FCAN:
		  if(++it[i].s>=6) it[i].s=0; break;
      }
	  if(it[i].t&0x8000) {
		if((j=Z_moveobj(&it[i].o))&Z_FALLOUT) {it[i].t=0;continue;}
		else if(j&Z_HITWATER) Z_splash(&it[i].o,it[i].o.r+it[i].o.h);
	  }
      if(Z_overlap(&it[i].o,&pl1.o))
		if(PL_give(&pl1,it[i].t&0x7FFF)) {
		  takesnd(it[i].t);
		  if(_2pl) if((it[i].t&0x7FFF)>=I_KEYR && (it[i].t&0x7FFF)<=I_KEYB) continue;
		  if(!(it[i].s=-itm_rtime) || (it[i].t&0x8000)) it[i].t=0;
		  continue;
		}
	  if(_2pl) if(Z_overlap(&it[i].o,&pl2.o))
		if(PL_give(&pl2,it[i].t&0x7FFF)) {
		  takesnd(it[i].t);
		  if((it[i].t&0x7FFF)>=I_KEYR && (it[i].t&0x7FFF)<=I_KEYB) continue;
		  if(!(it[i].s=-itm_rtime) || (it[i].t&0x8000)) it[i].t=0;
		  continue;
		}
	}
}

void IT_spawn (int x,int y,int t) {
  int i;

  for(i=0;i<MAXITEM;++i) if(!it[i].t) {
	it[i].t=t|0x8000;it[i].s=0;
    it[i].o.x=x;it[i].o.y=y;
    it[i].o.xv=it[i].o.yv=it[i].o.vx=it[i].o.vy=0;
    it[i].o.r=10;it[i].o.h=8;
    return;
  }
}

void IT_drop_ammo (int t, int n, int x, int y) {
  static int an[8]={10,4,1,40,50,25,5,100};
  int a;

again:;
  for(a=an[t-I_CLIP];n>=a;n-=a)
	IT_spawn(x+myrand(3*2+1)-3,y-myrand(7),t);
  if(t>=I_AMMO) {t-=4;goto again;}
}