/*****************************************************************************/
/* D2K: A Doom Source Port for the 21st Century                              */
/*                                                                           */
/* Copyright (C) 2014: See COPYRIGHT file                                    */
/*                                                                           */
/* This file is part of D2K.                                                 */
/*                                                                           */
/* D2K 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, either version 2 of the License, or (at your option) any      */
/* later version.                                                            */
/*                                                                           */
/* D2K 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 D2K.  If not, see <http://www.gnu.org/licenses/>.                    */
/*                                                                           */
/*****************************************************************************/


#include "z_zone.h"

#include "doomdef.h"
#include "doomstat.h"
#include "d_event.h"
#include "am_map.h"
#include "p_user.h"
#include "g_game.h"
#include "r_defs.h"
#include "r_patch.h"
#include "r_data.h"
#include "p_setup.h"
#include "p_mobj.h"
#include "p_inter.h"
#include "p_tick.h"
#include "m_cheat.h"
#include "m_argv.h"
#include "n_main.h"
#include "s_sound.h"
#include "sounds.h"
#include "dstrings.h"
#include "r_main.h"
#include "p_map.h"
#include "d_deh.h"  // Ty 03/27/98 - externalized strings
/* cph 2006/07/23 - needs direct access to thinkercap */
#include "p_tick.h"

#define plyr (players+consoleplayer)     /* the console player */

//e6y: for speedup
static int boom_cheat_route[MAX_COMPATIBILITY_LEVEL];

//-----------------------------------------------------------------------------
//
// CHEAT SEQUENCE PACKAGE
//
//-----------------------------------------------------------------------------

static void cheat_mus();
static void cheat_choppers();
static void cheat_god();
static void cheat_fa();
static void cheat_k();
static void cheat_kfa();
static void cheat_noclip();
static void cheat_pw();
static void cheat_behold();
static void cheat_clev();
static void cheat_mypos();
static void cheat_rate();
static void cheat_comp();
static void cheat_friction();
static void cheat_pushers();
static void cheat_tnttran();
static void cheat_massacre();
static void cheat_ddt();
static void cheat_hom();
static void cheat_fast();
static void cheat_tntkey();
static void cheat_tntkeyx();
static void cheat_tntkeyxx();
static void cheat_tntweap();
static void cheat_tntweapx();
static void cheat_tntammo();
static void cheat_tntammox();
static void cheat_smart();
static void cheat_pitch();
static void cheat_megaarmour();
static void cheat_health();
static void cheat_notarget();
static void cheat_fly();

//-----------------------------------------------------------------------------
//
// List of cheat codes, functions, and special argument indicators.
//
// The first argument is the cheat code.
//
// The second argument is its DEH name, or NULL if it's not supported by -deh.
//
// The third argument is a combination of the bitmasks:
// {always, not_dm, not_coop, not_net, not_menu, not_demo, not_deh},
// which excludes the cheat during certain modes of play.
//
// The fourth argument is the handler function.
//
// The fifth argument is passed to the handler function if it's non-negative;
// if negative, then its negative indicates the number of extra characters
// expected after the cheat code, which are passed to the handler function
// via a pointer to a buffer (after folding any letters to lowercase).
//
//-----------------------------------------------------------------------------

cheatseq_t cheat[] = {
  CHEAT("idmus",      "Change music",     always, cheat_mus, -2),
  CHEAT("idchoppers", "Chainsaw",         cht_never, cheat_choppers, 0),
  CHEAT("iddqd",      "God mode",         cht_never, cheat_god, 0),
  CHEAT("idkfa",      "Ammo & Keys",      cht_never, cheat_kfa, 0),
  CHEAT("idfa",       "Ammo",             cht_never, cheat_fa, 0),
  CHEAT("idspispopd", "No Clipping 1",    cht_never, cheat_noclip, 0),
  CHEAT("idclip",     "No Clipping 2",    cht_never, cheat_noclip, 0),
  CHEAT("idbeholdh",  "Invincibility",    cht_never, cheat_health, 0),
  CHEAT("idbeholdm",  "Invincibility",    cht_never, cheat_megaarmour, 0),
  CHEAT("idbeholdv",  "Invincibility",    cht_never, cheat_pw, pw_invulnerability),
  CHEAT("idbeholds",  "Berserk",          cht_never, cheat_pw, pw_strength),
  CHEAT("idbeholdi",  "Invisibility",     cht_never, cheat_pw, pw_invisibility),
  CHEAT("idbeholdr",  "Radiation Suit",   cht_never, cheat_pw, pw_ironfeet),
  CHEAT("idbeholda",  "Auto-map",         not_dm, cheat_pw, pw_allmap),
  CHEAT("idbeholdl",  "Lite-Amp Goggles", not_dm, cheat_pw, pw_infrared),
  CHEAT("idbehold",   "BEHOLD menu",      not_dm, cheat_behold, 0),
  CHEAT("idclev",     "Level Warp",       cht_never | not_menu, cheat_clev, -2),
  CHEAT("idmypos",    "Player Position",  not_dm, cheat_mypos, 0),
  CHEAT("idrate",     "Frame rate",       always, cheat_rate, 0),
  // phares
  CHEAT("tntcomp",    NULL,               cht_never, cheat_comp, 0),
  // jff 2/01/98 kill all monsters
  CHEAT("tntem",      NULL,               cht_never, cheat_massacre, 0),
  // killough 2/07/98: moved from am_map.c
  CHEAT("iddt",       "Map cheat",        not_dm, cheat_ddt, 0),
  // killough 2/07/98: HOM autodetector
  CHEAT("tnthom",     NULL,               always, cheat_hom, 0),
  // killough 2/16/98: generalized key cheats
  CHEAT("tntkey",     NULL,               cht_never, cheat_tntkey, 0),
  CHEAT("tntkeyr",    NULL,               cht_never, cheat_tntkeyx, 0),
  CHEAT("tntkeyy",    NULL,               cht_never, cheat_tntkeyx, 0),
  CHEAT("tntkeyb",    NULL,               cht_never, cheat_tntkeyx, 0),
  CHEAT("tntkeyrc",   NULL,               cht_never, cheat_tntkeyxx, it_redcard),
  CHEAT("tntkeyyc",   NULL,               cht_never, cheat_tntkeyxx, it_yellowcard),
  CHEAT("tntkeybc",   NULL,               cht_never, cheat_tntkeyxx, it_bluecard),
  CHEAT("tntkeyrs",   NULL,               cht_never, cheat_tntkeyxx, it_redskull),
  CHEAT("tntkeyys",   NULL,               cht_never, cheat_tntkeyxx, it_yellowskull),
  // killough 2/16/98: end generalized keys
  CHEAT("tntkeybs",   NULL,               cht_never, cheat_tntkeyxx, it_blueskull),
  // Ty 04/11/98 - Added TNTKA
  CHEAT("tntka",      NULL,               cht_never, cheat_k, 0),
  // killough 2/16/98: generalized weapon cheats
  CHEAT("tntweap",    NULL,               cht_never, cheat_tntweap, 0),
  CHEAT("tntweap",    NULL,               cht_never, cheat_tntweapx, -1),
  CHEAT("tntammo",    NULL,               cht_never, cheat_tntammo, 0),
  // killough 2/16/98: end generalized weapons
  CHEAT("tntammo",    NULL,               cht_never, cheat_tntammox, -1),
  // invoke translucency         // phares
  CHEAT("tnttran",    NULL,               always, cheat_tnttran, 0),
  // killough 2/21/98: smart monster toggle
  CHEAT("tntsmart",   NULL,               cht_never, cheat_smart, 0),
  // killough 2/21/98: pitched sound toggle
  CHEAT("tntpitch",   NULL,               always, cheat_pitch, 0),
  // killough 2/21/98: reduce RSI injury by adding simpler alias sequences:
  // killough 2/21/98: same as tnttran
  CHEAT("tntran",     NULL,               always, cheat_tnttran, 0),
  // killough 2/21/98: same as tntammo
  CHEAT("tntamo",     NULL,               cht_never, cheat_tntammo, 0),
  // killough 2/21/98: same as tntammo
  CHEAT("tntamo",     NULL,               cht_never, cheat_tntammox, -1),
  // killough 3/6/98: -fast toggle
  CHEAT("tntfast",    NULL,               cht_never, cheat_fast, 0),
  // phares 3/10/98: toggle variable friction effects
  CHEAT("tntice",     NULL,               cht_never, cheat_friction, 0),
  // phares 3/10/98: toggle pushers
  CHEAT("tntpush",    NULL,               cht_never, cheat_pushers, 0),

  // [RH] Monsters don't target
  CHEAT("notarget",   NULL,               cht_never, cheat_notarget, 0),
  // fly mode is active
  CHEAT("fly",        NULL,               cht_never, cheat_fly, 0),
  // end-of-list marker
  {NULL}
};

//-----------------------------------------------------------------------------

static void cheat_mus(char buf[3]) {
  int musnum;

  //jff 3/20/98 note: this cheat allowed in netgame/demorecord

  //jff 3/17/98 avoid musnum being negative and crashing
  if (!isdigit(buf[0]) || !isdigit(buf[1]))
    return;

  P_Echo(consoleplayer, s_STSTR_MUS); // Ty 03/27/98 - externalized

  if (gamemode == commercial) {
    musnum = mus_runnin + (buf[0] - '0') * 10 + buf[1] - '0' - 1;

    //jff 4/11/98 prevent IDMUS00 in DOOMII and IDMUS36 or greater
    if (musnum < mus_runnin || ((buf[0] - '0') * 10 + buf[1] - '0') > 35) {
      P_Echo(consoleplayer, s_STSTR_NOMUS); // Ty 03/27/98 - externalized
    }
    else {
      S_ChangeMusic(musnum, 1);
      idmusnum = musnum; //jff 3/17/98 remember idmus number for restore
    }
  }
  else {
    musnum = mus_e1m1 + (buf[0] - '1') * 9 + (buf[1] - '1');

    //jff 4/11/98 prevent IDMUS0x IDMUSx0 in DOOMI and greater than introa
    if (buf[0] < '1' ||
        buf[1] < '1' ||
        ((buf[0] - '1') * 9 + buf[1] - '1') > 31) {
      P_Echo(consoleplayer, s_STSTR_NOMUS); // Ty 03/27/98 - externalized
    }
    else {
      S_ChangeMusic(musnum, 1);
      idmusnum = musnum; //jff 3/17/98 remember idmus number for restore
    }
  }
}

// 'choppers' invulnerability & chainsaw
static void cheat_choppers() {
  players[consoleplayer].weaponowned[wp_chainsaw] = true;
  players[consoleplayer].powers[pw_invulnerability] = true;
  P_Echo(consoleplayer, s_STSTR_CHOPPERS); // Ty 03/27/98 - externalized
}

// 'dqd' cheat for toggleable god mode
static void cheat_god() {
  players[consoleplayer].cheats ^= CF_GODMODE;

  if (players[consoleplayer].cheats & CF_GODMODE) {
    if (players[consoleplayer].mo)
      players[consoleplayer].mo->health = god_health;  // Ty 03/09/98 - deh

    players[consoleplayer].health = god_health;
    P_Echo(consoleplayer, s_STSTR_DQDON); // Ty 03/27/98 - externalized
  }
  else {
    P_Echo(consoleplayer, s_STSTR_DQDOFF); // Ty 03/27/98 - externalized
  }
}

// CPhipps - new health and armour cheat codes
static void cheat_health() {
  if (!(players[consoleplayer].cheats & CF_GODMODE)) {
    if (players[consoleplayer].mo)
      players[consoleplayer].mo->health = mega_health;
    players[consoleplayer].health = mega_health;
    P_Echo(consoleplayer, s_STSTR_BEHOLDX); // Ty 03/27/98 - externalized
  }
}

static void cheat_megaarmour() {
  players[consoleplayer].armorpoints = idfa_armor;      // Ty 03/09/98 - deh
  players[consoleplayer].armortype = idfa_armor_class;  // Ty 03/09/98 - deh
  P_Echo(consoleplayer, s_STSTR_BEHOLDX); // Ty 03/27/98 - externalized
}

static void cheat_fa() {
  int i;

  if (!players[consoleplayer].backpack) {
    for (i = 0 ; i < NUMAMMO; i++)
      players[consoleplayer].maxammo[i] *= 2;
    players[consoleplayer].backpack = true;
  }

  players[consoleplayer].armorpoints = idfa_armor;      // Ty 03/09/98 - deh
  players[consoleplayer].armortype = idfa_armor_class;  // Ty 03/09/98 - deh

  // You can't own weapons that aren't in the game // phares 02/27/98
  for (i = 0; i < NUMWEAPONS; i++) {
    if (!(((i == wp_plasma || i == wp_bfg) && gamemode == shareware) ||
          (i == wp_supershotgun && gamemode != commercial))) {
      players[consoleplayer].weaponowned[i] = true;
    }
  }

  for (i = 0; i < NUMAMMO; i++) {
    if (i != am_cell || gamemode != shareware)
      players[consoleplayer].ammo[i] = players[consoleplayer].maxammo[i];
  }

  P_Echo(consoleplayer, s_STSTR_FAADDED);
}

static void cheat_k() {
  int i;

  for (i = 0; i < NUMCARDS; i++) {
    // only print message if at least one key added
    // however, caller may overwrite message anyway
    if (!players[consoleplayer].cards[i]) {
      players[consoleplayer].cards[i] = true;
      P_Echo(consoleplayer, "Keys Added");
    }
  }
}

static void cheat_kfa() {
  cheat_k();
  cheat_fa();
  P_Echo(consoleplayer, STSTR_KFAADDED);
}

static void cheat_noclip() {
  // Simplified, accepting both "noclip" and "idspispopd".
  // no clipping mode cheat

  players[consoleplayer].cheats ^= CF_NOCLIP;

  // Ty 03/27/98 - externalized
  if (players[consoleplayer].cheats & CF_NOCLIP)
    P_Echo(consoleplayer, s_STSTR_NCON);
  else
    P_Echo(consoleplayer, s_STSTR_NCOFF);
}

// 'behold?' power-up cheats (modified for infinite duration -- killough)
static void cheat_pw(int pw) {
  // killough
  if (players[consoleplayer].powers[pw]) {
    players[consoleplayer].powers[pw] = pw != pw_strength && pw != pw_allmap;
  }
  else {
    P_GivePower(plyr, pw);

    // infinite duration -- killough
    if (pw != pw_strength)
      players[consoleplayer].powers[pw] = -1;
  }
  P_Echo(consoleplayer, s_STSTR_BEHOLDX); // Ty 03/27/98 - externalized
}

// 'behold' power-up menu
static void cheat_behold() {
  P_Echo(consoleplayer, s_STSTR_BEHOLD); // Ty 03/27/98 - externalized
}

// 'clev' change-level cheat
static void cheat_clev(char buf[3]) {
  int epsd, map;

  if (gamemode == commercial) {
    epsd = 1; //jff was 0, but espd is 1-based
    map = (buf[0] - '0')*10 + buf[1] - '0';
  }
  else {
    epsd = buf[0] - '0';
    map = buf[1] - '0';
  }

  // Catch invalid maps.
  if (epsd < 1 || map < 1 ||   // Ohmygod - this is not going to work.
      //e6y: The fourth episode for pre-ultimate complevels is not allowed.
      (compatibility_level < ultdoom_compatibility && (epsd > 3)) ||
      (gamemode == retail     && (epsd > 4 || map > 9  )) ||
      (gamemode == registered && (epsd > 3 || map > 9  )) ||
      (gamemode == shareware  && (epsd > 1 || map > 9  )) ||
      (gamemode == commercial && (epsd > 1 || map > 33 ))) { //jff no 33 and 34
    return;                                                  //8/14/98 allowed
  }

  if (!bfgedition && map == 33)
    return;

  if (gamemission == pack_nerve && map > 9)
    return;

  // Chex.exe always warps to episode 1.
  if (gamemission == chex)
    epsd = 1;

  // So be it.
  P_Echo(consoleplayer, s_STSTR_CLEV); // Ty 03/27/98 - externalized

  G_DeferedInitNew(gameskill, epsd, map);
}

// 'mypos' for player position
// killough 2/7/98: simplified using dprintf and made output more user-friendly
static void cheat_mypos() {
  P_Printf(consoleplayer, "Position (%d,%d,%d)\tAngle %-.0f",
    players[consoleplayer].mo->x >> FRACBITS,
    players[consoleplayer].mo->y >> FRACBITS,
    players[consoleplayer].mo->z >> FRACBITS,
    players[consoleplayer].mo->angle * (90.0 / ANG90)
  );
}

// cph - cheat to toggle frame rate/rendering stats display
static void cheat_rate() {
  rendering_stats ^= 1;
}

// compatibility cheat

static void cheat_comp() {
  // CPhipps - modified for new compatibility system
  compatibility_level++; compatibility_level %= MAX_COMPATIBILITY_LEVEL;
  // must call G_Compatibility after changing compatibility_level
  // (fixes sf bug number 1558738)
  G_Compatibility();
  P_Printf(consoleplayer, "New compatibility level:\n%s",
    comp_lev_str[compatibility_level]
  );
}

// variable friction cheat
static void cheat_friction() {
  variable_friction = !variable_friction;

  // Ty 03/27/98 - *not* externalized
  if (variable_friction)
    P_Echo(consoleplayer, "Variable Friction enabled");
  else
    P_Echo(consoleplayer, "Variable Friction disabled");
}

// Pusher cheat
// phares 3/10/98
static void cheat_pushers() {
  allow_pushers = !allow_pushers;

  // Ty 03/27/98 - *not* externalized
  if (allow_pushers)
    P_Echo(consoleplayer, "Pushers enabled");
  else
    P_Echo(consoleplayer, "Pushers disabled");
}

// translucency cheat
static void cheat_tnttran() {
  general_translucency = !general_translucency;

  // Ty 03/27/98 - *not* externalized
  if (general_translucency)
    P_Echo(consoleplayer, "Translucency enabled");
  else
    P_Echo(consoleplayer, "Translucency disabled");

  // killough 3/1/98, 4/11/98: cache translucency map on a demand basis
  if (general_translucency && !main_tranmap)
    R_InitTranMap(0);
}

static void cheat_massacre() {  // jff 2/01/98 kill all monsters
  // jff 02/01/98 'em' cheat - kill all monsters
  // partially taken from Chi's .46 port
  //
  // killough 2/7/98: cleaned up code and changed to use dprintf;
  // fixed lost soul bug (LSs left behind when PEs are killed)

  int killcount = 0;
  thinker_t *currentthinker = NULL;
  extern void A_PainDie(mobj_t *);

  // killough 7/20/98: kill friendly monsters only if no others to kill
  uint64_t mask = MF_FRIEND;
  P_MapStart("cheat_massacre");
  do {
    while ((currentthinker = P_NextThinker(currentthinker, th_all)) != NULL)
      if (currentthinker->function == P_MobjThinker &&
          !(((mobj_t *) currentthinker)->flags & mask) && // killough 7/20/98
          (((mobj_t *) currentthinker)->flags & MF_COUNTKILL ||
           ((mobj_t *) currentthinker)->type == MT_SKULL)) {
        // killough 3/6/98: kill even if PE is dead
        if (((mobj_t *) currentthinker)->health > 0) {
          killcount++;
          P_DamageMobj((mobj_t *)currentthinker, NULL, NULL, 10000);
        }
        if (((mobj_t *) currentthinker)->type == MT_PAIN) {
          A_PainDie((mobj_t *) currentthinker);    // killough 2/8/98
          P_SetMobjState((mobj_t *) currentthinker, S_PAIN_DIE6);
        }
      }
  } while (!killcount && mask ? mask = 0, 1 : 0); // killough 7/20/98

  P_MapEnd();

  // killough 3/22/98: make more intelligent about plural
  // Ty 03/27/98 - string(s) *not* externalized

  if (killcount == 1)
    P_Printf(consoleplayer, "%d Monsters Killed\n", killcount);
  else
    P_Printf(consoleplayer, "1 Monster Killed\n");
}

// killough 2/7/98: move iddt cheat from am_map.c to here
// killough 3/26/98: emulate Doom better
static void cheat_ddt() {
  extern int ddt_cheating;

  if (automapmode & am_active)
    ddt_cheating = (ddt_cheating + 1) % 3;
}

// killough 2/7/98: HOM autodetection
static void cheat_hom() {
  flashing_hom = !flashing_hom;

  if (flashing_hom)
    P_Echo(consoleplayer, "HOM Detection On");
  else
    P_Echo(consoleplayer, "HOM Detection Off");
}

// killough 3/6/98: -fast parameter toggle
static void cheat_fast() {
  fastparm = !fastparm;

  // Ty 03/27/98 - *not* externalized
  if (fastparm)
    P_Echo(consoleplayer, "Fast Monsters On");
  else
    P_Echo(consoleplayer, "Fast Monsters Off");

  G_SetFastParms(fastparm); // killough 4/10/98: set -fast parameter correctly
}

// killough 2/16/98: keycard/skullkey cheat functions
static void cheat_tntkey() {
  P_Echo(consoleplayer, "Red, Yellow, Blue");  // Ty 03/27/98 - *not* externalized
}

static void cheat_tntkeyx() {
  P_Echo(consoleplayer, "Card, Skull");        // Ty 03/27/98 - *not* externalized
}

static void cheat_tntkeyxx(int key) {
  players[consoleplayer].cards[key] = !players[consoleplayer].cards[key];

  // Ty 03/27/98 - *not* externalized
  if (players[consoleplayer].cards[key])
    P_Echo(consoleplayer, "Key Added");
  else
    P_Echo(consoleplayer, "Key Removed");
}

// killough 2/16/98: generalized weapon cheats
static void cheat_tntweap() {
  // Ty 03/27/98 - *not* externalized
  // killough 2/28/98
  if (gamemode == commercial)
    P_Echo(consoleplayer, "Weapon number 1-9");
  else
    P_Echo(consoleplayer, "Weapon number 1-8");
}

static void cheat_tntweapx(char buf[3]) {
  int w = *buf - '1';

  if ((w == wp_supershotgun && gamemode != commercial) ||      // killough 2/28/98
      ((w == wp_bfg || w == wp_plasma) && gamemode == shareware)) {
    return;
  }

  // make '1' apply beserker strength toggle
  if (w == wp_fist) {
    cheat_pw(pw_strength);
  }
  else if (w >= 0 && w < NUMWEAPONS) {
    players[consoleplayer].weaponowned[w] =
      !players[consoleplayer].weaponowned[w];
    if (players[consoleplayer].weaponowned[w]) {
      // Ty 03/27/98 - *not* externalized
      P_Echo(consoleplayer, "Weapon Added");
    }
    else {
      // Ty 03/27/98 - *not* externalized
      P_Echo(consoleplayer, "Weapon Removed");

      // maybe switch if weapon removed
      if (w == players[consoleplayer].readyweapon)
        players[consoleplayer].pendingweapon = P_SwitchWeapon(plyr);
    }
  }
}

// killough 2/16/98: generalized ammo cheats
static void cheat_tntammo() {
  // Ty 03/27/98 - *not* externalized
  P_Echo(consoleplayer, "Ammo 1-4, Backpack");
}

static void cheat_tntammox(char buf[1]) {
  int a = *buf - '1';

  if (*buf == 'b') { // Ty 03/27/98 - strings *not* externalized
    players[consoleplayer].backpack = !players[consoleplayer].backpack;
    if (players[consoleplayer].backpack) {
      P_Echo(consoleplayer, "Backpack Added");

      for (a = 0; a < NUMAMMO; a++)
        players[consoleplayer].maxammo[a] <<= 1;
    }
    else {
      P_Echo(consoleplayer, "Backpack Removed");

      for (a = 0; a < NUMAMMO; a++) {
        if (players[consoleplayer].ammo[a] >
            (players[consoleplayer].maxammo[a] >>= 1)) {
          players[consoleplayer].ammo[a] = players[consoleplayer].maxammo[a];
        }
      }
    }
  }
  else if (a >= 0 && a < NUMAMMO) { // Ty 03/27/98 - *not* externalized
    // killough 5/5/98: switch plasma and rockets for now -- KLUDGE
    // HACK
    if (a == am_cell)
      a = am_misl;
    else if (a == am_misl)
      a = am_cell;

    players[consoleplayer].ammo[a] = !players[consoleplayer].ammo[a];

    if (players[consoleplayer].ammo[a])
      P_Echo(consoleplayer, "Ammo Added");
    else
      P_Echo(consoleplayer, "Ammo Removed");
  }
}

static void cheat_smart() {
  monsters_remember = !monsters_remember;

  if (monsters_remember)
    P_Echo(consoleplayer, "Smart Monsters Enabled");
  else
    P_Echo(consoleplayer, "Smart Monsters Disabled");
}

static void cheat_pitch() {
  pitched_sounds = !pitched_sounds;

  if (pitched_sounds)
    P_Echo(consoleplayer, "Pitch Effects Enabled");
  else
    P_Echo(consoleplayer, "Pitch Effects Disabled");
}

static void cheat_notarget() {
  players[consoleplayer].cheats ^= CF_NOTARGET;

  if (players[consoleplayer].cheats & CF_NOTARGET)
    P_Echo(consoleplayer, "No-target Mode On");
  else
    P_Echo(consoleplayer, "No-target Mode Off");
}

static void cheat_fly() {
  if (players[consoleplayer].mo != NULL) {
    players[consoleplayer].cheats ^= CF_FLY;

    if (players[consoleplayer].cheats & CF_FLY) {
      players[consoleplayer].mo->flags |= MF_NOGRAVITY;
      players[consoleplayer].mo->flags |= MF_FLY;
      P_Echo(consoleplayer, "Fly mode On");
    }
    else {
      players[consoleplayer].mo->flags &= ~MF_NOGRAVITY;
      players[consoleplayer].mo->flags &= ~MF_FLY;
      P_Echo(consoleplayer, "Fly mode Off");
    }
  }
}

//-----------------------------------------------------------------------------
// 2/7/98: Cheat detection rewritten by Lee Killough, to avoid
// scrambling and to use a more general table-driven approach.
//-----------------------------------------------------------------------------

static int M_FindCheats_Boom(int key) {
  static uint64_t sr;
  static char argbuf[CHEAT_ARGS_MAX + 1];
  static char *arg;
  static int init;
  static int argsleft;
  static int cht;

  int i;
  int ret;
  int matchedbefore;

  // If we are expecting arguments to a cheat
  // (e.g. idclev), put them in the arg buffer

  if (argsleft) {
    *arg++ = tolower(key);             // store key in arg buffer

    if (!--argsleft)                   // if last key in arg list,
      cheat[cht].func(argbuf);         // process the arg buffer

    return 1;                          // affirmative response
  }

  key = tolower(key) - 'a';
  if (key < 0 || key >= 32) {            // ignore most non-alpha cheat letters
    sr = 0;        // clear shift register
    return 0;
  }

  if (!init) {                           // initialize aux entries of table
    init = 1;
    for (i = 0; cheat[i].cheat; i++) {
      uint64_t c = 0, m = 0;
      const char *p;

      for (p = cheat[i].cheat; *p; p++) {
        unsigned key = tolower(*p) - 'a';  // convert to 0-31

        if (key >= 32)            // ignore most non-alpha cheat letters
          continue;

        c = (c << 5) + key;         // shift key into code
        m = (m << 5) + 31;          // shift 1's into mask
      }
      cheat[i].code = c;            // code for this cheat key
      cheat[i].mask = m;            // mask for this cheat key
    }
  }

  sr = (sr << 5) + key;                   // shift this key into shift register

  for (matchedbefore = ret = i = 0; cheat[i].cheat; i++) {
    if ((sr & cheat[i].mask) == cheat[i].code &&      // if match found
        !(cheat[i].when & not_dm   && deathmatch) &&  // and if cheat allowed
        !(cheat[i].when & not_coop && netgame && !deathmatch) &&
        !(cheat[i].when & not_demo && (demorecording || demoplayback)) &&
        !(cheat[i].when & not_menu && menuactive) &&
        !(cheat[i].when & not_deh  && M_CheckParm("-deh"))) {
      if (cheat[i].arg < 0) {        // if additional args are required
        cht = i;                     // remember this cheat code
        arg = argbuf;                // point to start of arg buffer
        argsleft = -cheat[i].arg;    // number of args expected
        ret = 1;                     // responder has eaten key
      }
      else if (!matchedbefore) {     // allow only one cheat at a time
        matchedbefore = ret = 1;     // responder has eaten key
        cheat[i].func(cheat[i].arg); // call cheat handler
      }
    }
  }

  return ret;
}

//
// CHEAT SEQUENCE PACKAGE
//

//
// Called in st_stuff module, which handles the input.
// Returns a 1 if the cheat was successful, 0 if failed.
//
static int M_FindCheats_Doom(int key) {
  int rc = 0;
  cheatseq_t* cht;
  char char_key;

  char_key = (char)key;

  for (cht = cheat; cht->cheat; cht++) {
    if (!(cht->when & not_dm   && deathmatch) &&  // and if cheat allowed
        !(cht->when & not_coop && netgame && !deathmatch) &&
        !(cht->when & not_demo && (demorecording || demoplayback)) &&
        !(cht->when & not_menu && menuactive) &&
        !(cht->when & not_deh  && M_CheckParm("-deh"))) {
      // if we make a short sequence on a cheat with parameters, this 
      // will not work in vanilla doom.  behave the same.

      if (demo_compatibility || compatibility_level == lxdoom_1_compatibility) {
        if (cht->arg < 0 && cht->deh_sequence_len < cht->sequence_len)
          continue;
      }

      if (cht->chars_read < cht->deh_sequence_len) {
        // still reading characters from the cheat code
        // and verifying.  reset back to the beginning 
        // if a key is wrong

        if (char_key == cht->cheat[cht->chars_read])
          ++cht->chars_read;
        else
          cht->chars_read = 0;

        cht->param_chars_read = 0;
      }
      else if (cht->param_chars_read < -cht->arg) {
        // we have passed the end of the cheat sequence and are 
        // entering parameters now 

        cht->parameter_buf[cht->param_chars_read] = char_key;

        ++cht->param_chars_read;

        // affirmative response
        rc = 1;
      }

      if (cht->chars_read >= cht->deh_sequence_len &&
          cht->param_chars_read >= -cht->arg) {
        if (cht->param_chars_read) {
          static char argbuf[CHEAT_ARGS_MAX + 1];

          // process the arg buffer
          memcpy(argbuf, cht->parameter_buf, -cht->arg);
          
          cht->func(argbuf);
        }
        else {
          // call cheat handler
          cht->func(cht->arg);
        }

        cht->chars_read = cht->param_chars_read = 0;
        rc = 1;
      }
    }
  }

  return rc;
}

static void cht_InitCheats(void) {
  static int init = false;

  if (!init) {
    cheatseq_t* cht;

    init = true;

    memset(boom_cheat_route, 0, sizeof(boom_cheat_route));
    boom_cheat_route[boom_compatibility_compatibility] = 1;
    boom_cheat_route[boom_201_compatibility] = 1;
    boom_cheat_route[boom_202_compatibility] = 1;
    boom_cheat_route[mbf_compatibility] = 1;

    for (cht = cheat; cht->cheat; cht++) {
      cht->deh_sequence_len = strlen(cht->cheat);
    }
  }
}

bool M_FindCheats(int key) {
  cht_InitCheats();

  if (boom_cheat_route[compatibility_level]) {
    return M_FindCheats_Boom(key);
  }

  return M_FindCheats_Doom(key);
}

/* vi: set et ts=2 sw=2: */

