hyperrogue/orbs.cpp

// Hyperbolic Rogue -- orbs
// Copyright (C) 2011-2019 Zeno Rogue, see 'hyper.cpp' for details

/** \file orbs.cpp
 *  \brief Implementation of various Orb effects, and their properties such as default and maximum charges
 */

#include "hyper.h"

namespace hr {

EX array<bool, ittypes> orbused;
EX array<bool, ittypes> lastorbused;

EX bool markOrb(eItem it) {
  if(!items[it]) return false;
  orbused[it] = true;
  return true;
  }

EX bool markEmpathy(eItem it) {
  if(!items[itOrbEmpathy]) return false;
  if(!markOrb(it)) return false;
  markOrb(itOrbEmpathy);
  return true;
  }

EX bool markEmpathy2(eItem it) {
  if(items[itOrbEmpathy] < 2) return false;
  if(!markOrb2(it)) return false;
  markOrb2(itOrbEmpathy);
  return true;
  }

EX bool markOrb2(eItem it) {
  return markOrb(it);
  /* if(!items[it]) return false;
  orbused[it] = true;
  return items[it] > 1; */
  }

EX int fixpower(int qty, bool checking) {
  if(checking ? items[itOrbEnergy] : markOrb(itOrbEnergy)) qty = (qty+1)/2;
  return qty;
  }

EX void useupOrb(eItem it, int qty) {
  items[it] -= fixpower(qty, false);
  if(items[it] < 0) items[it] = 0;
  }

EX void drainOrb(eItem it, int target IS(0)) {
  if(items[it] > target) useupOrb(it, items[it] - target);
  }

EX void empathyMove(const movei& mi) {  
  if(!items[itOrbEmpathy]) return;

  if(items[itOrbFire]) {
    invismove = false;
    if(makeflame(mi.s, 10, false)) markEmpathy(itOrbFire);
    }

  if(items[itCurseWater]) {
    invismove = false;
    if(makeshallow(mi.s, 10, false)) markEmpathy(itCurseWater);
    }

  if(items[itOrbDigging]) {           
   if(mi.proper() && earthMove(mi)) 
     markEmpathy(itOrbDigging), invismove = false;
   }

  if(items[itOrbWinter] && isIcyLand(mi.s) && mi.s->wall == waNone) {
    invismove = false;
    mi.s->wall = waIcewall;
    markEmpathy(itOrbWinter);
    }
  }

EX int intensify(int val) {
  return inv::on ? 2 * val : val * 6 / 5;
  }

EX bool reduceOrbPower(eItem it, int cap) {
  if(items[it] && markOrb(itCurseDraining)) {
    items[it] -= (markOrb(itOrbEnergy) ? 1 : 2) * multi::activePlayers();
    if(items[it] < 0) items[it] = 0;
    if(items[it] == 0 && it == itOrbLove) 
      princess::bringBack();
    }
  if(items[it] && (lastorbused[it] || (it == itOrbShield && items[it]>3) || !markOrb(itOrbTime))) {
    items[it] -= multi::activePlayers();
    if(isHaunted(cwt.at->land)) 
      fail_survivalist();
    if(items[it] < 0) items[it] = 0;
    if(items[it] > cap && markOrb(itOrbIntensity)) cap = intensify(cap);
    if(items[it] > cap && timerghost) items[it] = cap;
    if(items[it] == 0 && it == itOrbLove) 
      princess::bringBack();
    return true;
    }
  if(items[it] > cap && timerghost) items[it] = cap;
  return false;
  }

EX void reduceOrbPowerAlways(eItem it) {
  if(items[it]) {
    items[it] -= multi::activePlayers();
    if(items[it] < 0) items[it] = 0;
    }
  }

EX void reverse_curse(eItem curse, eItem orb, bool cancel) {
  if(items[curse] && markOrb(itOrbPurity)) {
    items[orb] += items[curse];
    if(curse == itCurseWater) items[itOrbWinter] += items[curse];
    items[curse] = 0;
    }
  if(cancel && items[curse] && items[orb]) {
    int m = min(items[curse], items[orb]);
    items[curse] -= m;
    items[orb] -= m;
    }
  }

EX void reduceOrbPowers() {

  reverse_curse(itCurseWeakness, itOrbSlaying, true);
  reverse_curse(itCurseFatigue, itOrbSpeed, false); // OK
  reverse_curse(itCurseRepulsion, itOrbMagnetism, true); // OK
  reverse_curse(itCurseWater, itOrbFire, true); // OK
  reverse_curse(itCurseDraining, itOrbTime, false); // OK
  reverse_curse(itCurseGluttony, itOrbChoice, true); // OK
    
  if(haveMount()) markOrb(itOrbDomination);
  for(int i=0; i<ittypes; i++) 
    lastorbused[i] = orbused[i], orbused[i] = false;
  if(items[itOrbShield]) orbused[itOrbShield] = lastorbused[itOrbShield];
  reduceOrbPower(itOrbTime, cwt.at->land == laCaribbean ? 777 : 150);
  if(invismove && !invisfish) markOrb(itOrbInvis);
  reduceOrbPower(itOrbLightning, 777);
  reduceOrbPower(itOrbSpeed, 67);
  reduceOrbPower(itOrbShield, 77);
  reduceOrbPower(itOrbShell, 150);
  reduceOrbPower(itOrbFlash, 777);
  reduceOrbPower(itOrbWinter, 77);
  reduceOrbPower(itOrbFire, 77);
  reduceOrbPower(itOrbIllusion, 111);
  reduceOrbPower(itOrbDragon, 111);
  reduceOrbPower(itOrbPsi, 111);
  reduceOrbPower(itOrbInvis, 77);
  reduceOrbPower(itOrbAether, 77);
  reduceOrbPower(itOrbWoods, 100);
  reduceOrbPower(itOrbDigging, 100);
  reduceOrbPower(itOrbTeleport, 200);
  reduceOrbPower(itOrbSpace, 150);
  reduceOrbPower(itOrbMagnetism, 150);
  reduceOrbPowerAlways(itOrbSafety);
  reduceOrbPower(itOrbThorns, 150);
  reduceOrbPower(itOrbWater, 150);
  reduceOrbPower(itOrbAir, 150);
  reduceOrbPower(itOrbFrog, 77);
  reduceOrbPower(itOrbDash, 77);
  reduceOrbPower(itOrbPhasing, 77);
  reduceOrbPower(itOrbDiscord, 67);
  reduceOrbPower(itOrbSummon, 333);
  reduceOrbPower(itOrbMatter, 333);
  reduceOrbPower(itOrbFish, 57 + 20 * multi::activePlayers());
  if(!items[itSavedPrincess]) items[itOrbLove] = 0;
  reduceOrbPower(itOrbLove, 777);
  reduceOrbPower(itOrbStunning, 100);
  reduceOrbPower(itOrbLuck, 333);
  reduceOrbPower(itOrbUndeath, 77);
  reduceOrbPower(itOrbFreedom, 77);
  reduceOrbPower(itOrbEmpathy, 77);
  markOrb(itOrb37); reduceOrbPower(itOrb37, 333);
  reduceOrbPower(itOrbBeauty, 77);
  reduceOrbPower(itOrbEnergy, 77);
  reduceOrbPower(itOrbDomination, 120);
  reduceOrbPower(itOrbSword, 100 + 20 * multi::activePlayers());
  reduceOrbPower(itOrbSword2, 100 + 20 * multi::activePlayers());
  reduceOrbPower(itOrbStone, 120);
  reduceOrbPower(itOrbNature, 120);
  reduceOrbPower(itOrbRecall, 77);
  reduceOrbPower(itOrbBull, 120);
  reduceOrbPower(itOrbHorns, 77);
  reduceOrbPower(itOrbLava, 80);
  reduceOrbPower(itOrbMorph, 80);
  reduceOrbPower(itOrbSlaying, 120);
  reduceOrbPower(itOrbGravity, 120);
  reduceOrbPower(itOrbChoice, 120);
  reduceOrbPower(itOrbIntensity, 120);
  reduceOrbPower(itOrbImpact, 120);
  reduceOrbPower(itOrbChaos, 120);
  reduceOrbPower(itOrbPlague, 120);

  reduceOrbPower(itOrbSide1, 120);
  reduceOrbPower(itOrbSide2, 120);
  reduceOrbPower(itOrbSide3, 120);
  if(cwt.at->land != laWildWest)
    reduceOrbPower(itRevolver, 6);

  reduceOrbPower(itOrbPurity, 30);
  reduceOrbPower(itCurseWeakness, 199);
  reduceOrbPower(itCurseDraining, 199);
  reduceOrbPower(itCurseWater, 199);
  reduceOrbPower(itCurseFatigue, 199);
  reduceOrbPower(itCurseRepulsion, 199);
  reduceOrbPower(itCurseGluttony, 199);

  #if CAP_COMPLEX2
  mine::auto_teleport_charges();
  #endif

  whirlwind::calcdirs(cwt.at); 
  items[itStrongWind] = !items[itOrbAether] && whirlwind::qdirs == 1;
  items[itWarning] = 0;
  }

eWall orig_wall;

EX void flashAlchemist(cell *c) {
  if(isAlch(c) && isAlch(orig_wall)) {
    record_spillinfo(c, orig_wall);
    c->wall = orig_wall;
    }
  }

EX void flashCell(cell *c, eMonster killer, flagtype flags) {
  changes.ccell(c);
  eWall ow = c->wall;
  flashAlchemist(c);
  if((flags & AF_MSG) && c->monst && !isWorm(c) && c->monst != moShadow)
    addMessage(XLAT("%The1 is destroyed by the Flash.", c->monst));
  if(c->monst || isPlayerOn(c)) 
    if(canAttack(nullptr, killer, c, c->monst, flags))
      attackMonster(c, flags, killer);
  if(isIcyLand(c))
    HEAT(c) += 2;
  if(c->land == laDryForest)
    c->landparam += 2;
  if(c->wall == waCavewall)  c->wall = waCavefloor;
  if(c->wall == waDeadTroll) c->wall = waCavefloor;
  if(c->wall == waDeadTroll2) c->wall = waNone;
  if(c->wall == waPetrified) c->wall = waNone;
  if(c->wall == waDeadfloor2)  c->wall = waDeadfloor;
  if(c->wall == waGargoyleFloor)  c->wall = waChasm;
  if(c->wall == waGargoyleBridge)  placeWater(c, c);
  if(c->wall == waGargoyle)  c->wall = waNone;
  if(c->wall == waTerraWarrior)  c->wall = waNone, kills[moTerraWarrior]++;
  if(c->wall == waPlatform)  c->wall = waNone;
  if(c->wall == waStone)     c->wall = waNone, destroyTrapsAround(c);
  if(c->wall == waRubble)    c->wall = waNone;
  if(c->wall == waDeadwall)  c->wall = waDeadfloor2;
  if(c->wall == waGiantRug)  c->wall = waNone;
  if(c->wall == waMirror)    c->wall = waNone;
  if(c->wall == waCloud)     c->wall = waNone;
  if(c->wall == waExplosiveBarrel) explodeBarrel(c);
  if(c->wall == waRuinWall)  c->wall = waNone;
  if(c->wall == waDune)      c->wall = waNone;
  if(c->wall == waSaloon)    c->wall = waNone;
  if(c->wall == waSandstone) c->wall = waNone;
  if(c->wall == waAncientGrave) c->wall = waNone;
  if(c->wall == waFreshGrave) c->wall = waNone;
  if(c->wall == waColumn)    c->wall = waNone;
  if(c->wall == waGlass)     c->wall = waNone;
  if(c->wall == waBigTree || c->wall == waSmallTree)    c->wall = waNone;
  if(c->wall == waBigStatue) c->wall = waNone;
  if(c->wall == waCTree)     c->wall = waCIsland2;
  if(c->wall == waPalace)    c->wall = waRubble;
  if(c->wall == waRose)      c->wall = waNone;
  if(c->wall == waOpenGate || c->wall == waClosedGate) {
    eWall w = c->wall;
    c->wall = waNone;
    for(int i=0; i<c->type; i++) if(c->move(i) && c->move(i)->wall == w)
      flashCell(c->move(i), killer, flags);
    }
  if(c->wall == waRed1)      c->wall = waNone;
  else if(c->wall == waRed2)      c->wall = waRed1;
  else if(c->wall == waRed3)      c->wall = waRed2;
  
  if(c->wall == waBarrowWall) c->wall = waBarrowDig;
  else if(c->wall == waBarrowDig) c->wall = waNone;

  if(c->wall != ow && ow) drawParticles(c, winf[ow].color, 16);
  
  if(hasTimeout(c) && c->wparam < 77) c->wparam = 77;
  if(isActivable(c))
    activateActiv(c, false);
  }

EX void activateFlashFrom(cell *cf, eMonster who, flagtype flags) {
  drawFlash(cf);
  orig_wall = cwt.at->wall;
  playSound(cf, "storm");
  for(int i=0; i<isize(dcal); i++) {
    cell *c = dcal[i];
    if(c == cf) continue;
    for(int t=0; t<c->type; t++)
    for(int u=0; u<cf->type; u++)
      if(c->move(t) == cf->move(u) && c->move(t) != NULL) {
        flashCell(c, who, flags);
        goto nexti;
        }
    nexti: ;
    }
  }

EX bool distanceBound(cell *c1, cell *c2, int d) {
  if(!c1 || !c2) return false;
  if(d == 0) return c1 == c2;
  for(int i=0; i<c2->type; i++)
    if(distanceBound(c1, c2->move(i), d-1)) return true;
  return false;
  }

EX void checkFreedom(cell *cf) {
  manual_celllister cl;
  dynamicval<decltype(orbused)> d(orbused);
  cl.add(cf);
  for(int i=0; i<isize(cl.lst); i++) {
    cell *c = cl.lst[i];
    if(c->cpdist >= 5) return;
    for(int i=0; i<c->type; i++) {
      cell *c2 = c->move(i);
      // todo leader
      if(cl.listed(c2)) continue;
      if(!passable(c2, c, P_ISPLAYER | P_MIRROR | P_LEADER)) continue;
      if(againstRose(c, c2) && !scentResistant()) continue;
      if(c2->wall == waArrowTrap && c2->wparam == 2) continue;
      bool monsterhere = false;
      for(int j=0; j<c2->type; j++) {
        cell *c3 = c2->move(j);
        if(c3 && c3->monst && !isFriendly(c3)) 
          monsterhere = true;
        }
      if(!monsterhere) cl.add(c2);
      }
    }
  addMessage(XLAT("Your %1 activates!", itOrbFreedom));
  drainOrb(itOrbFreedom);
  orig_wall = cwt.at->wall;
  for(cell *pc: player_positions()) 
    drawBigFlash(pc);
  for(int i=0; i<isize(dcal); i++) {
    cell *c = dcal[i];
    if(c == cf && !shmup::on) continue;
    if(c->cpdist > 5) break;
    flashCell(c, moPlayer, AF_MAGIC);
    }
  }

EX void activateFlash() {
  int tk = tkills();

  for(cell *pc: player_positions()) 
    drawFlash(pc);

  addMessage(XLAT("You activate the Flash spell!"));
  orig_wall = cwt.at->wall;
  playSound(cwt.at, "storm");
  drainOrb(itOrbFlash);
  for(int i=0; i<isize(dcal); i++) {
    cell *c = dcal[i];
    if(c->cpdist > 2) break;
    flashCell(c, moPlayer, AF_MAGIC);
    }
  achievement_count("FLASH", tkills(), tk);
  }

EX bool reflectingBarrierAt(cell *c) {
  return 
    c->wall == waBarrier || c->wall == waCamelot || 
    c->wall == waPalace || c->wall == waPlatform ||
    c->wall == waTempWall || c->wall == waWarpGate || c->wall == waBarrowDig || c->wall == waBarrowWall;
  }

EX bool reflectingBarrierAt(cellwalker& c, int d) {
  if(d >= 3) return true;
  if(d <= -3) return true;
  d = gmod(c.spin + d, c.at->type);
  if(!c.at->move(d)) return true;
  
  return reflectingBarrierAt(c.at->move(d));
  // WAS:
  // if(c.at->move(d)->wall == waBarrier) return true;
  // THEN:
  // if(c.at->move(d)->land == laBarrier || c.at->move(d)->land == laOceanWall ||
  //   c.at->move(d)->land == laHauntedWall || 
  //   c.at->move(d)->land == laElementalWall) ;
  // return false;
  }

EX void killAdjacentSharks(cell *c) {
  for(int i=0; i<c->type; i++) {
    cell *c2 = c->move(i);
    if(!c2) continue;
    if(isShark(c2->monst)) {
      changes.ccell(c2);
      c2->ligon = true;
      killMonster(c2, moLightningBolt);
      killAdjacentSharks(c2);
      }
    if(isKraken(c2->monst) && isWatery(c2)) {
      changes.ccell(c2);
      cell *c3 = kraken::head(c2);
      changes.ccell(c3);
      c3->ligon = true; 
      forCellEx(c4, c3) changes.ccell(c4), killMonster(c4, moLightningBolt); // kill-all
      forCellEx(c4, c3) if(isWatery(c4)) {
        c4->ligon = true;
        killAdjacentSharks(c4);
        }
      }
    }
  }

EX void castLightningBolt(cellwalker lig) {
  int bnc = 0;
  int counter = 1000;
  while(true) {
    counter--; if(counter < 0) break;
    // printf("at: %p i=%d d=%d\n", lig.c, i, lig.spin);

    killAdjacentSharks(lig.at);
    
    if(lig.peek() == NULL) break;

    lig += wstep;
    if(inmirror(lig)) lig = mirror::reflect(lig);
    
    cell *c = lig.at;
    changes.ccell(c);

    eWall ow = c->wall;

    flashAlchemist(c);
    if(c->monst == moMetalBeast2 && !c->item) c->item = itFulgurite;
    if(c->monst) 
      if(canAttack(nullptr, moPlayer, c, c->monst, AF_MAGIC))
        attackMonster(c, AF_MAGIC, moLightningBolt);
    if(isIcyLand(c)) HEAT(c) += 2;
    if(c->land == laDryForest) c->landparam += 2;
    bool first = !c->ligon;
    c->ligon = 1;
    
    bool brk = false, spin = false;
    
    if(c->wall == waGargoyle)  brk = true;
    if(c->wall == waExplosiveBarrel) explodeBarrel(c), brk = true;
    if(c->wall == waCavewall)  c->wall = waCavefloor, brk = true;
    if(c->wall == waDeadTroll) c->wall = waCavefloor, brk = true;
    if(c->wall == waDeadTroll2)c->wall = waNone, brk = true;
    if(c->wall == waPetrified) c->wall = waNone, brk = true;
    if(c->wall == waDeadfloor2)c->wall = waDeadfloor;
    if(c->wall == waRubble)    c->wall = waNone;
    if(c->wall == waDeadwall)  c->wall = waDeadfloor2, brk = true;
    if(c->wall == waGlass)     c->wall = waNone, spin = true;
    if(c->wall == waDune)      c->wall = waNone, brk = true;
    if(c->wall == waRuinWall)  c->wall = waNone;
    if(c->wall == waIcewall)   c->wall = waNone, brk = true;
    if(c->wall == waAncientGrave) c->wall = waNone, spin = true;
    if(c->wall == waFreshGrave) c->wall = waNone, spin = true;

    if(c->wall == waFreshGrave) c->wall = waNone, spin = true;

    if(c->wall == waBigStatue) c->wall = waNone, spin = true;
    if(c->wall == waColumn)    c->wall = waNone, spin = true;
    if(c->wall == waStone)     c->wall = waNone, brk = true, destroyTrapsAround(c);
    if(c->wall == waArrowTrap) activateArrowTrap(c);
    if(c->wall == waTerraWarrior)  c->wall = waNone, kills[moTerraWarrior]++;
    
    if(c->wall == waCanopy || c->wall == waTrunk || c->wall == waBigBush || c->wall == waSmallBush) {
      makeflame(c, 12, false); brk = true;
      }

    if(c->wall == waGrounded)  brk = true;
    if(c->wall == waFan)       spin = true;
    if(c->wall == waMetal)     c->wall = waCharged, brk = true;
    if(c->wall == waSandstone) {
      c->wall = waNone, brk = true;
      if(c->land == laStorms) c->item = itFulgurite;
      }

    if(c->wall == waCharged && first) {
      for(int i=0; i<c->type; i++) 
        // do not do strange things in horocyclic spires
        if(c->move(i) && c->move(i)->wall != waCharged) {
          cellwalker lig2(c, i);
          castLightningBolt(lig2);
          }
      brk = true;
      }
                             
    if(c->wall == waBoat && c != cwt.at)    become_water(c), spin = true;
    if(c->wall == waStrandedBoat && c !=cwt.at)    c->wall = waNone, spin = true;

    if((c->wall == waNone || c->wall == waSea) && c->land == laLivefjord)
      c->wall = eWall(c->wall ^ waSea ^ waNone);
    
    if(c->wall == waRed1)      c->wall = waNone;
    if(c->wall == waRed2)      c->wall = waRed1;
    if(c->wall == waRed3)      c->wall = waRed2, brk = true;
    
    if(isActivable(c))         activateActiv(c, false);
    if(c->wall == waBigTree || c->wall == waSmallTree || c->wall == waVinePlant ||
      c->wall == waSaloon)    {
      makeflame(c, 4, false);
      brk = true;
      }
    if(c->wall == waDock)  makeflame(c, 5, false);
    if(c->wall == waCTree) makeflame(c, 12, false);
    if(c->wall == waRose)  makeflame(c, 60, false);
    if(cellHalfvine(c) && c->wall == lig.peek()->wall) {
      destroyHalfvine(c, waPartialFire, 4);
      brk = true;
      }

    if(c->wall != ow && ow)  
      drawParticles(c, winf[ow].color, 16);

    if(c == cwt.at)             {bnc++; if(bnc > 10) break; }
    if(spin) lig += hrand(lig.at->type);
    
    if(brk) break;
    
    if(reflectingBarrierAt(c)) {
      int left = -1;
      int right = 1;
      while(!reflectingBarrierAt(lig, left)) left--;
      while(!reflectingBarrierAt(lig, right)) right++;
      lig += right + left;
      if(c->wall == waBarrowWall) c->wall = waBarrowDig;
      else if(c->wall == waBarrowDig) c->wall = waNone;
      bnc++; if(bnc > 10) break;
      }
    else 
      lig += rev;
    
    if(lig.at->wall == waCloud) {
      lig.at->wall = waNone;
      mirror::createMirages(lig, mirror::LIGHTNING);
      }
    if(lig.at->wall == waMirror) {
      lig.at->wall = waNone;
      mirror::createMirrors(lig, mirror::LIGHTNING);
      }
    }
  }

EX void castLightningBoltFrom(cell *c) {
  orig_wall = c->wall;
  for(int i=0; i<c->type; i++) castLightningBolt(cellwalker(c, i));
  }

EX void activateLightning() {
  int tk = tkills();
  drawLightning();
  addMessage(XLAT("You activate the Lightning spell!"));

  for(int i=0; i<isize(dcal); i++) if(dcal[i]) dcal[i]->ligon = 0;

  drainOrb(itOrbLightning);

  for(cell *pc: player_positions()) 
    castLightningBoltFrom(pc);
    
  elec::afterOrb = true;
  elec::act();
  elec::afterOrb = false;
  
  achievement_count("LIGHTNING", tkills(), tk);
  playSound(cwt.at, "storm");
  }

// roCheck: return orb type if successful, 0 otherwise
// roMouse/roKeyboard: 
//    return orb type if successful, eItem(-1) if do nothing, 0 otherwise

EX bool haveRangedTarget() {
  if(!haveRangedOrb())
    return false;
  for(int i=0; i<isize(dcal); i++) {
    cell *c = dcal[i];
    if(targetRangedOrb(c, roCheck)) {
      return true;
      }
    }
  return false;
  }

void checkmoveO() {
  if(multi::players > 1 && multi::activePlayers() == 1)
    multi::checklastmove();
  if(multi::players == 1) checkmove();
  }

int teleportAction() {
  // normal teleport
  if(shmup::on || numplayers() == 1) return 1; 
  // multi-player, but all in -- do nothing
  else if(numplayers() == multi::activePlayers()) return 0;
  // otherwise teleport to the game
  else return 2;
  }

EX void teleportTo(cell *dest) {
  playSound(dest, "other-teleport");
  if(dest->monst) {
    cwt.at->monst = dest->monst;
    cwt.at->stuntime = dest->stuntime;
    dest->monst = moNone;
    }
    
  if(teleportAction() == 2) {
    bool b = multiRevival(dest, NULL);
    if(b) {
      killFriendlyIvy();
      drainOrb(itOrbTeleport);
      movecost(cwt.at, dest, 3);      
      playerMoveEffects(movei(cwt.at, dest, TELEPORT));
      afterplayermoved();
      bfs();
      }
    return;
    }
  
  addMessage(XLAT("You teleport to a new location!"));

  killFriendlyIvy();
  cell *from = cwt.at;
  movecost(from, dest, 1);
  playerMoveEffects(movei(cwt.at, dest, TELEPORT));
  fix_whichcopy(dest);
  cwt.at = dest; cwt.spin = hrand(dest->type); flipplayer = !!(hrand(2));
  drainOrb(itOrbTeleport);

  mirror::destroyAll();

  afterplayermoved();
  bfs();
  
  sword::reset();
  items[itOrbSword2] = 0;
  if(shmup::on)
    shmup::teleported();
  else
    checkmoveO();

  movecost(from, dest, 2);
  #if CAP_COMPLEX2
  mine::auto_teleport_charges();
  #endif
  }

/* calls changes.rollback or changes.commit */
EX bool jumpTo(orbAction a, cell *dest, eItem byWhat, int bonuskill IS(0), eMonster dashmon IS(moNone)) {
  if(byWhat != itStrongWind) playSound(dest, "orb-frog");
  cell *from = cwt.at;
  changes.value_keep(cwt);
  changes.ccell(dest);
  changes.ccell(cwt.at);

  if(byWhat == itOrbFrog) {
    useupOrb(itOrbFrog, 5);
    addMessage(XLAT("You jump!"));
    }
  
  if(byWhat == itOrbDash) {
    useupOrb(itOrbDash, 5);
    if(dashmon) addMessage(XLAT("You vault over %the1!", dashmon));
    }
  
  if(byWhat == itOrbPhasing) {
    useupOrb(itOrbPhasing, 5);
    addMessage(XLAT("You jump!"));
    }
  
  movecost(from, dest, 1);
  
  killFriendlyIvy();

  cell *c1 = cwt.at;
  animateMovement(match(cwt.at, dest), LAYER_SMALL);
  cwt.at = dest; 
  forCellIdEx(c2, i, dest) if(c2->cpdist < dest->cpdist) {
    cwt.spin = i;
    flipplayer = true;
    }

  sword::reset();
  auto mi = movei(c1, dest, JUMP);
  stabbingAttack(mi, moPlayer, bonuskill);
  playerMoveEffects(mi);

  if(itemclass(byWhat) == IC_ORB)
    apply_impact(dest);

  // do not apply movecost later, when from no longer exists
  if(cwt.at->item == itOrbSafety) {
    movecost(from, dest, 2);
    from = NULL;
    }
  if(cwt.at->item != itOrbYendor && cwt.at->item != itHolyGrail) {
    auto c = collectItem(cwt.at, from, true);
    if(c) {
      return true;
      }
    }

  mirror::destroyAll();
  
  if(monstersnearO(a, dest)) {
    changes.rollback();
    return false;
    }
  
  if(isCheck(a)) {
    changes.rollback();
    return true;
    }
  
  changes.commit();

  fix_whichcopy(dest);
  countLocalTreasure();
  
  for(int i=9; i>=0; i--)
    setdist(cwt.at, i, NULL);
  
  if(from) movecost(from, dest, 2);

  createNoise(1);

  if(shmup::on)
    shmup::teleported();
  else
    monstersTurn();

  return true;
  }

/* calls changes.rollback or changes.commit */
bool growIvyTo(orbAction a, const movei& mi) {
  auto& dest = mi.t;
  flagtype f = AF_NORMAL | AF_MSG;
  if(items[itOrbEmpathy] && items[itOrbSlaying]) {
    if(!canAttack(mi.s, moFriendlyIvy, mi.t, mi.t->monst, AF_MUSTKILL)) {
      markOrb(itOrbEmpathy); markOrb(itOrbSlaying);
      }
    f |= AF_CRUSH;
    }

  changes.ccell(dest);

  if(dest->monst) 
    attackMonster(dest, f, moFriendlyIvy);
  else {
    dest->monst = moFriendlyIvy;
    dest->mondir = mi.rev_dir_or(NODIR);
    animateMovement(mi, LAYER_BIG);
    moveEffect(mi, moFriendlyIvy);
    empathyMove(mi);
    }

  apply_impact(dest);
  markOrb(itOrbNature);

  if(monstersnearO(a, cwt.at)) {
    changes.rollback();
    return false;
    }

  if(isCheck(a)) {
    changes.rollback();
    return true;
    }

  changes.commit();
  createNoise(1);
  monstersTurn();
  return true;
  }

pair<int, bool> spacedrain(cell *c) {
  int d = c->cpdist;
  bool usemagnet = items[itOrbMagnetism] && d > 0;
  if(usemagnet) d--;
  return {d * d, usemagnet};
  }
 
void telekinesis(cell *dest) {
  
  auto cost = spacedrain(dest); 
  
  if(dest->land == laAlchemist && isAlchAny(dest) && isAlchAny(cwt.at))
    dest->wall = cwt.at->wall;

  if(dest->land == laPower && cwt.at->land != laPower && dest->item != itOrbFire && dest->item != itOrbLife) {
    if(itemclass(dest->item) != IC_ORB)
      items[dest->item] ++;
    else
      items[dest->item] += 2;
    addMessage(XLAT("The Orb loses its power as it leaves the Land of Power!"));
    dest->item = itNone;
    }

  if(dest->wall == waGlass) {
    drainOrb(itOrbSpace);
    addMessage(XLAT("Your power is drained by %the1!", dest->wall));
    }    

  moveItem(dest, cwt.at, true);
  collectItem(cwt.at, cwt.at, true);
  useupOrb(itOrbSpace, cost.first);
  if(cost.second) 
    markOrb(itOrbMagnetism);

  createNoise(3);
  checkSwitch();
  bfs();
  if(!shmup::on) checkmoveO();
  }

EX eMonster summonedAt(cell *dest) {
  if(dest->monst) return moNone;
  if(dest->wall == waVineHalfA || dest->wall == waVineHalfB || dest->wall == waVinePlant)
    return moVineSpirit;
  if(dest->wall == waCTree)
    return moParrot;
  if(dest->wall == waLake)
    return moGreaterShark;
  if(dest->wall == waAncientGrave || dest->wall == waFreshGrave)
    return moGhost;
  if(dest->wall == waClosePlate || dest->wall == waOpenPlate)
    return dest->land == laPalace ? moPalace : moBat;
  if(dest->wall == waFloorA || dest->wall == waFloorB)
    return moSlime;
  if(dest->wall == waCavefloor)
    return moTroll;
  if(dest->wall == waDeadfloor)
    return moEarthElemental;
  if(dest->wall == waDeadfloor2)
    return moMiner;
  if(dest->wall == waMineOpen || dest->wall == waMineMine || dest->wall == waMineUnknown)
    return moBomberbird;
  if(dest->wall == waRichDie)
    return moAnimatedDie;
  if(dest->wall == waHappyDie)
    return moAngryDie;
  if(dest->wall == waTrapdoor)
    return dest->land == laPalace ? moFatGuard : moOrangeDog;
  if(dest->land == laFrog && dest->wall == waNone) {
    forCellEx(c1, dest) if(c1->wall == waShrub) return moVaulter;
    forCellEx(c1, dest) if(c1->wall == waDeepWater) return moFrog;
    forCellEx(c1, dest) if(c1->wall == waStone) return moPhaser;
    }
  if(dest->wall == waSea)
    return 
      isElemental(dest->land) ? moWaterElemental :
      dest->land == laLivefjord ? moViking : 
      dest->land == laKraken ? moViking : 
      dest->land == laWarpCoast ? moRatling : 
      dest->land == laDocks ? moWaterElemental :
      moPirate;
  if(isReptile(dest->wall))
    return moReptile;
  if(dest->wall == waChasm)
    return moAirElemental;
  if(isFire(dest) || dest->wall == waMagma)
    return moFireElemental;
  if(dest->wall == waCavewall || dest->wall == waDeadwall)
    return moSeep;
  if(dest->wall == waRed1 || dest->wall == waRed2 || dest->wall == waRed3)
    return moRedTroll;
  if(dest->wall == waFrozenLake)
    return moFireElemental;
  if(dest->wall == waCIsland || dest->wall == waCIsland2)
    return moWaterElemental;
  if(dest->wall == waRubble || dest->wall == waGargoyleFloor || dest->wall == waGargoyleBridge || dest->wall == waLadder)
    return moGargoyle;
  if(dest->wall == waStrandedBoat)
    return moWaterElemental;
  if(dest->wall == waBoat)
    return moAirElemental;
  if(dest->wall == waStone || dest->wall == waRuinWall)
    return moEarthElemental;
  if(dest->wall == waGiantRug)
    return moVizier;
  if(dest->wall == waNone) {
    if(dest->land == laHunting) return moAirElemental;
    if(dest->land == laBull) return moRagingBull;
    if(dest->land == laPrairie) return moAirElemental;
    if(dest->land == laZebra) return moAirElemental;
    if(dest->land == laMirror) return moAirElemental;
    if(dest->land == laMountain) return moAirElemental; // unfortunately Ivies are too large
    if(dest->land == laDungeon) return moBat;
    if(dest->land == laIce) return moFireElemental;
    if(dest->land == laDesert) return moEarthElemental;
    if(dest->land == laJungle) return moWaterElemental;
    if(dest->land == laGraveyard) return moZombie;
    if(dest->land == laRlyeh || dest->land == laTemple) return moPyroCultist;
    if(dest->land == laHell) return moWaterElemental;
    if(dest->land == laPower) return moWitchFire;
    if(dest->land == laWineyard) return moVineBeast;
    if(dest->land == laEmerald) return moMiner;
    if(dest->land == laHive) return dest->type == 7 ? moBug1 : moBug0;
    if(dest->land == laRedRock) return moRedTroll;
    if(dest->land == laOcean) return moEarthElemental;
    if(dest->land == laDryForest) return moFireFairy;
    if(dest->land == laLivefjord) return moFjordTroll;
    if(dest->land == laStorms) return moStormTroll;
    if(dest->land == laOvergrown) return moForestTroll;
    if(dest->land == laIvoryTower) return moAirElemental;
    if(dest->land == laEndorian) return moAirElemental;
    if(dest->land == laEAir) return moAirElemental;
    if(dest->land == laEWater) return moWaterElemental;
    if(dest->land == laEEarth) return moEarthElemental;
    if(dest->land == laEFire) return moFireElemental;
    if(dest->land == laMotion) return moRunDog;
    if(dest->land == laWildWest) return moOutlaw;
    if(dest->land == laClearing) return moForestTroll;
    if(dest->land == laWhirlwind) return moAirElemental;
    if(dest->land == laWarpCoast) return moRatling;
    if(dest->land == laRose) return moRoseLady;
    if(dest->land == laDragon) return moFireElemental;
    if(dest->land == laTortoise) return moTortoise;
    if(dest->land == laBurial) return moEarthElemental;
    if(dest->land == laVolcano) return moFireElemental;
    if(dest->land == laBlizzard) return moAirElemental;
    if(dest->land == laTerracotta) return moEarthElemental;
    if(dest->land == laRuins) return moEarthElemental;
    if(dest->land == laSwitch) return passive_switch;
    if(dest->land == laSnakeNest) return moEarthElemental;
    if(dest->land == laBrownian) return moAcidBird;
    if(dest->land == laVariant) return moFireElemental;
    if(dest->land == laWestWall) return moAirElemental;
    if(isHaunted(dest->land)) return moGhost;
    }
  return moNone;
  }

void summonAt(cell *dest) {
  playSound(dest, "orb-ranged");
  dest->monst = summonedAt(dest);
  dest->stuntime = 3;
  if(dest->monst == moPirate || dest->monst == moViking || (dest->monst == moRatling && dest->wall == waSea))
    dest->wall = waBoat, dest->item = itNone;
  if(dest->monst == moAnimatedDie)
    dest->wall = waNone;
  if(dest->monst == moAngryDie)
    dest->wall = waNone;
  if(dest->monst == moViking && dest->land == laKraken)
    dest->item = itOrbFish;
  if(dest->wall == waStrandedBoat)
    dest->wall = waBoat;
  else if(dest->monst == moWaterElemental)
    placeWater(dest, dest);
  if(dest->wall == waStone)
    dest->wall = waNone;
  if(dest->monst == moFireElemental && isFire(dest))
    dest->wall = waNone;
  if(dest->monst == moTortoise)
    tortoise::emap[dest] = getBits(dest), dest->hitpoints = 3;
  addMessage(XLAT("You summon %the1!", dest->monst));
  moveEffect(movei(dest, FALL), dest->monst);
  if(dest->wall == waClosePlate || dest->wall == waOpenPlate)
    toggleGates(dest, dest->wall);

  if(hasHitpoints(dest->monst))
    dest->hitpoints = palaceHP();

  useupOrb(itOrbSummon, 20);
  createNoise(2);
  bfs();
  checkmoveO();
  }

bool tempWallPossibleAt(cell *dest) {
  if(dest->land == laWestWall) return false;
  if(dest->monst || (dest->item && !itemHidden(dest))) return false;
  return dest->wall == waChasm || isWatery(dest) || dest->wall == waNone ||
    dest->wall == waTempBridge;
  }

void tempWallAt(cell *dest) {
  if(dest->wall == waChasm)
    dest->wall = waTempFloor;
  else if(dest->wall == waNone)
    dest->wall = waTempWall;
  else if(dest->wall == waTempBridge) {
    dest->wall = waTempBridgeBlocked;
    return;
    }
  else if(isWatery(dest))
    dest->wall = waTempBridge;
  int len = (items[itOrbMatter]+1) / 2;
  dest->wparam = len;
  useupOrb(itOrbMatter, len);
  dest->item = itNone; // underwater items are destroyed by this
  createNoise(2);
  bfs();
  checkmoveO();
  }

void psi_attack(cell *dest) {
  playSound(dest, "other-mind");
  if(isNonliving(dest->monst))
    addMessage(XLAT("You destroy %the1 with a mental blast!", dest->monst));
  else if(isDragon(dest->monst) || isKraken(dest->monst))
    addMessage(XLAT("You damage %the1 with a mental blast!", dest->monst));
  else
    addMessage(XLAT("You kill %the1 with a mental blast!", dest->monst));
  // note: psi attack works with Petrify!
  attackMonster(dest, AF_PSI, moPlayer);
  useupOrb(itOrbPsi, 30);
  createNoise(2);
  bfs();
  checkmoveO();
  }

bool gun_attack(orbAction a, cell *dest) {
  playSound(dest, "orb-ranged");
  addMessage(XLAT("You shoot %the1!", dest->monst));
  changes.ccell(dest);
  attackMonster(dest, AF_GUN, moNone);
  apply_impact(dest);

  if(monstersnearO(a, cwt.at)) {
    changes.rollback();
    return false;
    } 
  if(isCheck(a)) {
    changes.rollback();
    return true;
    }
  changes.commit();
  items[itRevolver] --;
  bfs();
  checkmoveO();
  createNoise(5);
  monstersTurn();
  return true;
  }

EX void checkStunKill(cell *dest) {
  if(isBird(dest->monst)) {
    moveEffect(movei(dest, FALL), moDeadBird);
    doesFall(dest);
    if(isWatery(dest) || dest->wall == waChasm || isFire(dest)) {
      addMessage(XLAT("%The1 falls!", dest->monst));
      fallMonster(dest);
      return;
      }
    }
  if(dest->monst == moShadow) {
    addMessage(XLAT("%The1 is destroyed!", dest->monst));
    killMonster(dest, moNone);
    }
  /* if(!isPermanentFlying(dest->monst) && cellEdgeUnstable(dest)) {
    addMessage(XLAT("%The1 falls!", dest->monst));
    fallMonster(dest);
    } */
  }

void stun_attack(cell *dest) {
  playSound(dest, "orb-ranged");
  addMessage(XLAT("You stun %the1!", dest->monst));
  dest->stuntime += 5;
  checkStunKill(dest);
  useupOrb(itOrbStunning, 10);
  createNoise(3);
  bfs();
  checkmoveO();
  }

void poly_attack(cell *dest) {
  playSound(dest, "orb-ranged");
  eMonster orig = dest->monst;
  auto polymonsters = {
    moYeti, moRunDog, moRanger,
    moMonkey, moCultist,
    moFallingDog, moVariantWarrior, moFamiliar, moOrangeDog,
    moRedFox, moFalsePrincess, moResearcher,
    moNarciss,
    };
  int ssf = 0;
  eMonster target = *(polymonsters.begin() + hrand(isize(polymonsters)));
  for(eMonster m: polymonsters)
    if(kills[m] && m != dest->monst) {
      ssf += kills[m];
      if(hrand(ssf) < kills[m])
        target = m;
      }
  addMessage(XLAT("You polymorph %the1 into %the2!", dest->monst, target));
  dest->monst = target;
  if(!dest->stuntime) dest->stuntime = 1;

  if(orig == moPair) {
    cell *dest2 = dest->move(dest->mondir);
    if(dest2->monst == moPair) {
      dest2->monst = dest->monst;
      if(!dest2->stuntime) dest2->stuntime = 1;
      }
    }
  
  checkStunKill(dest);
  useupOrb(itOrbMorph, 3);
  createNoise(3);
  bfs();
  checkmoveO();
  }

void placeIllusion(cell *c) {
  c->monst = moIllusion;
  c->stuntime = 0;
  useupOrb(itOrbIllusion, 5);
  addMessage(XLAT("You create an Illusion!"));
  bfs();
  checkmoveO();
  }

void blowoff(const movei& mi) {
  auto& cf = mi.s;
  auto& ct = mi.t;
  bool die = cf->wall == waRichDie;
  playSound(ct, "orb-ranged");
  if(cf->monst)
  addMessage(XLAT("You blow %the1 away!", cf->monst));
  if(cf->wall == waThumperOff) activateActiv(cf, false);
  if(isPushable(cf->wall) || cf->wall == waBigStatue)
    pushThumper(mi);
  else if(isBoat(cf) && !cf->monst) {
    bool was_stranded = cf->wall == waStrandedBoat;
    bool willbe_stranded = ct->wall == waNone;
    if(was_stranded) cf->wall = waBoat;
    if(willbe_stranded) become_water(ct);
    moveBoat(mi);
    if(was_stranded) cf->wall = waNone;
    if(willbe_stranded) ct->wall = waStrandedBoat;
    }
  else
    pushMonster(mi);
  if(cf->item == itBabyTortoise) {
    if(ct->item) ct->item = itNone;
    moveItem(cf, ct, true);
    }
  #if CAP_COMPLEX2
  if(ct->monst == moAnimatedDie && dice::data[ct].happy() > 0) {
    ct->monst = moNone;
    ct->wall = waHappyDie;
    if(ct->land == laDice && cf->land == laDice) {    
      cf->item = itDice;
      addMessage(XLAT("The die is now happy, and you are rewarded!"));
      }
    }
  if(die && ct->wall == waHappyDie) {
    /* pushMonster already awarded us -- place the reward on cf instead */
    cf->item = itDice;
    items[itDice]--;
    }
  if(ct->wall == waHappyDie && dice::data[ct].happy() <= 0) {
    ct->monst = moAngryDie;
    ct->wall = waNone;
    ct->stuntime = 5;
    addMessage(XLAT("You have made a Happy Die angry!"));
    }
  #endif
  items[itOrbAir]--;
  createNoise(2);
  bfs();
  checkmoveO();
  }

void useOrbOfDragon(cell *c) {
  makeflame(c, 20, false);
  playSound(c, "fire");
  addMessage(XLAT("You throw fire!"));
  useupOrb(itOrbDragon, 5);
  createNoise(3);
  bfs();
  checkmoveO();
  }

EX bool monstersnearO(orbAction a, cell *c) {
  // printf("[a = %d] ", a);
  if(shmup::on) return false;
  if(a == roCheck && multi::players > 1) 
    return true;
  else if(a == roMultiCheck) return false;
  else return monstersnear(c, moPlayer);
  }

EX bool isCheck(orbAction a) { return a == roCheck || a == roMultiCheck; }
EX bool isWeakCheck(orbAction a) { return a == roCheck || a == roMultiCheck || a == roMouse; }

EX movei blowoff_destination(cell *c, int& di) {
  int d = 0;
  for(; d<c->type; d++) if(c->move(d) && c->move(d)->cpdist < c->cpdist) break;
  if(d<c->type) for(int e=d; e<d+c->type; e++) {
    int di = e % c->type;
    cell *c2 = c->move(di);
    #if CAP_COMPLEX2    
    if(dice::on(c) && !dice::can_roll(movei(c, di)))
      continue;
    #endif
    if(c2 && c2->cpdist > c->cpdist && passable(c2, c, P_BLOW)) return movei(c, c2, di);
    }
  return movei(c, c, NO_SPACE);
  }

EX int check_jump(cell *cf, cell *ct, flagtype flags, cell*& jumpthru) {
  int partial = 1;
  forCellCM(c2, cf) {
    if(isNeighbor(c2, ct)) {
      jumpthru = c2;
      if(passable(c2, cf, flags | P_JUMP1)) {
        partial = 2;
        if(passable(ct, c2, flags | P_JUMP2)) {
          return 3;
          }
        }
      }
    }
  return partial;
  }

EX int check_phase(cell *cf, cell *ct, flagtype flags, cell*& jumpthru) {
  int partial = 1;
  forCellCM(c2, cf) {
    if(isNeighbor(c2, ct) && !nonAdjacent(cf, c2) && !nonAdjacent(c2, ct)) {
      jumpthru = c2;
      if(passable(ct, cf, flags | P_PHASE)) {
        partial = 2;
        if(c2->monst || (isWall(c2) && c2->wall != waShrub)) {
          return 3;
          }
        }
      }
    }
  return partial;
  }

EX cell *common_neighbor(cell *cf, cell *ct) {
  forCellCM(cc, cf) {
    if(isNeighbor(cc, ct)) return cc;
    }
  return nullptr;
  }

EX void apply_impact(cell *c) {
  if(markOrb(itOrbImpact))
    forCellEx(c1, c) {
      if(!c1->monst) continue;
      if(c1->monst == moMimic) continue;
      if(isMultitile(c1->monst)) continue;
      addMessage(XLAT("You stun %the1!", c1->monst));
      changes.ccell(c1);
      c1->stuntime = min(c1->stuntime + 5, 7);
      checkStunKill(c1);
      }
  }

EX int check_vault(cell *cf, cell *ct, flagtype flags, cell*& jumpthru) {
  cell *c2 = NULL, *c3 = NULL;    
  forCellCM(cc, cf) {
    if(isNeighbor(cc, ct)) c3 = c2, c2 = cc;
    }
  jumpthru = c2;
  if(!c2) return 0;
  if(c3) return 1;
  bool cutwall = among(c2->wall, waShrub, waExplosiveBarrel, waSmallTree, waBigTree);
  if(!c2->monst && !cutwall) return 2;
  bool for_monster = !(flags & P_ISPLAYER);
  if(for_monster && c2->monst && frog_power(c2->monst) && !items[itOrbDiscord]) return 2;
  if(!cutwall && !passable(c2, cwt.at, flags | P_JUMP1 | P_MONSTER)) return 3;
  if(!passable(ct, c2, flags | P_JUMP2)) return 4;
  if(!cutwall && !canAttack(cwt.at, moPlayer, c2, c2->monst, 0)) return 5;
  return 6;
  }

EX bool disable_orb_range = false;

EX eItem targetRangedOrb(cell *c, orbAction a) {

  if(!haveRangedOrb()) {
    if(!isWeakCheck(a))
      addMessage(XLAT("You have no ranged Orbs!"));
    return itNone;
    }
  
  if(rosedist(cwt.at) == 1) {
    int r = rosemap[cwt.at];
    int r2 = rosemap[c];
    if(r2 <= r && !markOrb(itOrbBeauty)) {
      if(a == roKeyboard || a == roMouseForce)
        addMessage(XLAT("Those roses smell too nicely. You can only target cells closer to them!"));
      return itNone;
      }
    }

  // (-2) shmup variants
  eItem shmupEffect = shmup::targetRangedOrb(a);
  
  if(shmupEffect) return shmupEffect;
  
  // (-1) distance

  if(!disable_orb_range && !mine::in_minesweeper()) {
    if(c == cwt.at || isNeighbor(cwt.at, c)) {
      if(!isWeakCheck(a))
        addMessage(XLAT("You cannot target that close!"));
      return itNone;
      }
    if(c->cpdist > 7) {
      if(!isWeakCheck(a))
        addMessage(XLAT("You cannot target that far away!"));
      return itNone;
      }
    }
  
  vector<string> orb_error_messages;

  #define CHKV(b, v) ((b) ? true : (v, false))
  #define CHK(b, s) CHKV(b, orb_error_messages.push_back(s))
  #define INI (changes.init(isCheck(a)), true)
  #define CHK_ROLLBACK(b, s) CHKV(b, (orb_error_messages.push_back(s), changes.rollback()))

  bool wouldkill_there = false;
  bool wouldkill_here = false;

  // (0-) strong wind
  if(items[itStrongWind]
    && CHK(c->cpdist == 2 && cwt.at == whirlwind::jumpFromWhereTo(c, true), XLAT("Strong wind can only take you to a specific place!"))) {
    changes.init(isCheck(a));
    if(jumpTo(a, c, itStrongWind)) return itStrongWind;
    }
  
  // (0x) control
  if(items[itOrbDomination] && haveMount() && dragon::whichturn != turncount) {
    if(!isCheck(a)) { 
      dragon::target = c;
      dragon::whichturn = turncount;
      addMessage(XLAT("Commanded %the1!", haveMount()));
      checkmoveO();
      }
    return itOrbDomination;
    }
  
  // (0) telekinesis

  if(items[itOrbSpace]
    && CHK(c->item && !itemHiddenFromSight(c), XLAT("%The1 can only be used on items!", itOrbSpace))
    && CHK(!cwt.at->item, XLAT("Cannot use %the1 here!", itOrbSpace))
    && CHK(!saved_tortoise_on(c), XLAT("No, that would be heartless!"))
    && CHK(items[itOrbSpace] >= fixpower(spacedrain(c).first, isCheck(a)), XLAT("Not enough power for telekinesis!"))
    && CHK(!cantGetGrimoire(c, !isCheck(a)), XLAT("Cannot use %the1 here!", itOrbSpace))
    && CHK(c->item != itBarrow, XLAT("%The1 is protected from this kind of magic!", c->item))
    ) {
    if(!isCheck(a)) {
      bool saf = c->item == itOrbSafety;
      telekinesis(c);
      if(!saf) apply_impact(c);
      }
    return itOrbSpace;
    }
  
  // (0') air blow
  if(items[itOrbAir]
    && CHK(isBlowableMonster(c->monst) || isPushable(c->wall) || c->wall == waBigStatue || isBoat(c),
        c->monst ? XLAT("%The1 is immune to wind!", c->monst) : XLAT("Nothing to blow here!"))
    ) {
    int di = NODIR;
    movei mi = blowoff_destination(c, di);
    auto& c2 = mi.t;
    bool nowhereToBlow = false;
    if(!mi.op()) nowhereToBlow = true;
    else if(isBoat(c) && !isWatery(c2) && c2->wall != waNone) nowhereToBlow = true;
    else if(c->wall == waBigStatue && !canPushStatueOn(c2, P_BLOW)) nowhereToBlow = true;
    else {
      if(!isCheck(a)) blowoff(mi), apply_impact(c);
      return itOrbAir;
      }
    CHK(!nowhereToBlow, isBlowableMonster(c->monst) ? XLAT("Nowhere to blow %the1!", c->monst) : XLAT("Nowhere to blow %the1!", c->wall));
    }
  
  // nature
  if(items[itOrbNature]
    && CHK(numplayers() == 1, XLAT("Cannot be used in multiplayer"))
    && CHK(c->monst != moFriendlyIvy, XLAT("You cannot grow on yourself!"))
    ) {
    changes.init(isCheck(a));
    vector<int> dirs;
    forCellIdCM(cf, d, c)
      if(cf->monst == moFriendlyIvy) {

        flagtype f = 0;
        if(items[itOrbEmpathy] && items[itOrbSlaying]) f |= AF_CRUSH;

        if(c->monst ? (
          CHK(canAttack(cf, moFriendlyIvy, c, c->monst, f), XLAT("Cannot attack there!"))
          ) : (
          CHK(passable(c, cf, P_ISFRIEND | P_MONSTER), XLAT("Cannot grow there!")) &&
          CHK(!strictlyAgainstGravity(c, cf, false, MF_IVY), XLAT("Cannot grow against gravity!"))
          ))
          dirs.push_back(d);
        }
      
    int di = hrand_elt(dirs, -1);
    if(CHK(di != -1, XLAT("You cannot grow there from any adjacent cell!"))) {
      if(growIvyTo(a, movei(c, di).rev()))
        return itOrbNature;
      else
        wouldkill_here = true;
      }
    else changes.rollback();
    }
    
  // (0'') jump
  cell *jumpthru = NULL;
  
  // orb of vaulting
  if(!shmup::on && items[itOrbDash] && CHK(c->cpdist == 2, XLAT("Cannot vault that far!"))) {
    changes.init(isCheck(a));
    int vaultstate = check_vault(cwt.at, c, P_ISPLAYER, jumpthru);

    if(vaultstate == 0) orb_error_messages.push_back(XLAT("ERROR: No common neighbor to vault through!"));
    if(vaultstate == 1) orb_error_messages.push_back(XLAT("Can only vault in a roughly straight line!"));
    if(vaultstate == 2) orb_error_messages.push_back(XLAT("Nothing to vault over!"));
    if(vaultstate == 3) orb_error_messages.push_back(XLAT("Cannot pass through %the1 while vaulting!", jumpthru->wall));
    if(vaultstate == 4 && c->monst) orb_error_messages.push_back(XLAT("Cannot vault onto %the1!", c->monst));
    if(vaultstate == 4 && !c->monst) orb_error_messages.push_back(XLAT("Cannot vault to %the1!", c->wall));
    if(vaultstate == 5) orb_error_messages.push_back(XLAT("Cannot attack %the1 while vaulting!", jumpthru->monst));

    if(vaultstate == 6) {
      int k = tkills();
      eMonster m = jumpthru->monst;
      if(jumpthru->wall == waShrub) {
        addMessage(XLAT("You chop down the shrub."));
        jumpthru->wall = waNone;
        }
      if(jumpthru->wall == waSmallTree) {
        addMessage(XLAT("You chop down the tree."));
        jumpthru->wall = waNone;
        }
      if(jumpthru->wall == waBigTree) {
        addMessage(XLAT("You start chopping down the tree."));
        jumpthru->wall = waSmallTree;
        }
      if(jumpthru->wall == waExplosiveBarrel) {
        explodeBarrel(jumpthru);
        }
      if(m)
        attackMonster(jumpthru, AF_NORMAL | AF_MSG, moPlayer);
      k = tkills() - k;
      if(jumpTo(a, c, itOrbDash, k, m)) vaultstate = 7;
      else wouldkill_there = true;
      if(vaultstate == 7) return itOrbDash;
      }
    else changes.rollback();
    }
  
  if(items[itOrbFrog] && CHK(c->cpdist == 2, XLAT("Cannot jump that far!"))) {
    changes.init(isCheck(a));
    int frogstate = check_jump(cwt.at, c, P_ISPLAYER, jumpthru);
    if(frogstate == 1 && jumpthru && jumpthru->monst) {
      orb_error_messages.push_back(XLAT("Cannot jump through %the1!", jumpthru->monst));
      }
    else if(frogstate == 1 && jumpthru) {
      orb_error_messages.push_back(XLAT("Cannot jump through %the1!", jumpthru->wall));
      }
    else if(frogstate == 2 && c->monst) {
      orb_error_messages.push_back(XLAT("Cannot jump onto %the1!", c->monst));
      }
    else if(frogstate == 2 && c->wall) {
      orb_error_messages.push_back(XLAT("Cannot jump on %the1!", c->wall));
      }

    if(frogstate == 3) {
      if(jumpTo(a, c, itOrbFrog)) frogstate = 4;
      else wouldkill_there = true;
      if(frogstate == 4) return itOrbFrog;
      }
    else changes.rollback();
    }
  
  if(items[itOrbPhasing] && CHK(c->cpdist == 2, XLAT("Cannot phase that far!"))) {
    changes.init(isCheck(a));
    if(shmup::on) shmup::pushmonsters();
    int phasestate = check_phase(cwt.at, c, P_ISPLAYER, jumpthru);
    if(phasestate == 1 && c->monst) {
      orb_error_messages.push_back(XLAT("Cannot phase onto %the1!", c->monst));
      }
    else if(phasestate == 1) {
      orb_error_messages.push_back(XLAT("Cannot phase to %the1!", c->wall));
      }
    else if(phasestate == 2) {
      orb_error_messages.push_back(XLAT("Nothing to phase through!"));
      }

    if(phasestate == 3) {
      if(jumpTo(a, c, itOrbPhasing)) phasestate = 4;
      else wouldkill_there = true;
      }
    else changes.rollback();
    if(shmup::on) shmup::popmonsters();
    if(phasestate == 4) return itOrbPhasing;
    }
  
  // (1) switch with an illusion
  if(items[itOrbTeleport] && c->monst == moIllusion
    && CHK(!cwt.at->monst, XLAT("You need to move to give space to %the1!", cwt.at->monst))
    && CHK(teleportAction() == 1, XLAT("All players are in the game!"))) {
    if(!isCheck(a)) teleportTo(c), apply_impact(c);
    return itOrbTeleport;
    }

  // (2) place illusion
  if(!shmup::on && items[itOrbIllusion]
    && CHK(c->monst == moNone, XLAT("Cannot cast illusion on a monster!"))
    && CHK(c->item == itNone || itemHidden(c), XLAT("Cannot cast illusion on an item!"))
    && INI && CHK_ROLLBACK(passable(c, NULL, P_MIRROR), XLAT("Cannot cast illusion here!"))) {
    if(!isCheck(a)) {
      changes.commit(), placeIllusion(c), apply_impact(c);
      }
    else changes.rollback();
    return itOrbIllusion;
    }

  // (3) teleport
  if(items[itOrbTeleport]
    && CHK(c->monst == moNone, XLAT("Cannot teleport on a monster!"))
    && CHK(c->item == itNone || itemHidden(c), XLAT("Cannot teleport on an item!"))
    && CHK(teleportAction(),  XLAT("All players are in the game!"))
    && shmup::verifyTeleport()
    && INI && CHK_ROLLBACK(passable(c, NULL, P_ISPLAYER | P_TELE), XLAT("Cannot teleport here!"))
    ) {
    if(!isCheck(a)) {
      changes.commit(), teleportTo(c), apply_impact(c), println(hlog, "commiting teleport ", items[itOrbTeleport]);
      }
    else changes.rollback();
    return itOrbTeleport;
    }
    
  // (4) remove an illusion
  if(!shmup::on && items[itOrbIllusion] && c->monst == moIllusion) {
    if(!isCheck(a)) {
      addMessage(XLAT("You take the Illusion away."));
      items[itOrbIllusion] += 3; // 100% effective with the Orb of Energy!
      apply_impact(c);
      c->monst = moNone;
      }
    return itOrbIllusion;
    }

  // (4a) colt
  if(items[itRevolver] && !shmup::on
    && CHK(c->monst, XLAT("Can only use %the1 on a monster!", itRevolver))
    && CHK(canAttack(cwt.at, moPlayer, c, c->monst, AF_GUN), XLAT("%The1 is immune to %the2!", c->monst, itRevolver))
    ) {
    bool inrange = false;
    for(cell *c1: gun_targets(cwt.at)) if(c1 == c) inrange = true;
    if(inrange) {
      changes.init(isCheck(a));
      if(gun_attack(a, c)) return itRevolver;
      }
    }
  
  // (5) psi blast (non-shmup variant)
  if(!shmup::on && items[itOrbPsi]
    && CHK(c->monst, XLAT("Can only use %the1 on a monster!", itOrbPsi))
    && CHK((isDragon(c->monst) || !isWorm(c)) && c->monst != moShadow && c->monst != moKrakenH, XLAT("%The1 is immune to mental blasts!", c->monst))
    ) {
    if(!isCheck(a)) psi_attack(c), apply_impact(c);
    return itOrbPsi;
    }
  
  // (5a) summoning
  if(items[itOrbSummon]
    && CHK(summonedAt(c), c->monst ? XLAT("Cannot summon on a monster!") : XLAT("No summoning possible here!"))
    ) {
    if(!isCheck(a)) summonAt(c), apply_impact(c);
    return itOrbSummon;
    }

  // (5b) matter
  if(items[itOrbMatter]
    && CHK(tempWallPossibleAt(c), 
      c->monst ? XLAT("Cannot create temporary matter on a monster!") :
      c->item ? XLAT("Cannot create temporary matter on an item!") :
      XLAT("Cannot create temporary matter here!"))
    ) {
    if(!isCheck(a)) tempWallAt(c), apply_impact(c);
    return itOrbMatter;
    }

  // (5c) stun
  if(items[itOrbStunning] && !shmup::on
    && CHK(c->monst, XLAT("%The1 can only be used on monsters.", itOrbStunning))
    && CHK(!isMultitile(c->monst),XLAT("%The1 cannot be used on big monsters.", itOrbStunning))
    && CHK(c->monst != moMimic, XLAT("%The1 cannot be used on %the2.", itOrbStunning, c->monst))
    && CHK(c->stuntime < 3, XLAT("%The1 is already stunned!", c->monst))
    ) {
    if(!isCheck(a)) stun_attack(c), apply_impact(c);
    return itOrbStunning;
    }
  
  // (5d) poly
  if(items[itOrbMorph] && !shmup::on
    && CHK(c->monst, XLAT("%The1 can only be used on monsters.", itOrbMorph))
    && CHK(!isMultitile(c->monst), XLAT("%The1 cannot be used on big monsters.", itOrbMorph))
    ) {
    if(!isCheck(a)) poly_attack(c), apply_impact(c);
    return itOrbMorph;
    }
  
  // (6) place fire (non-shmup variant)
  if(items[itOrbDragon] && !shmup::on
    && CHK(makeflame(c, 20, true), XLAT("Cannot throw fire there!"))
    ) {
    if(!isCheck(a)) useOrbOfDragon(c), apply_impact(c);
    return itOrbDragon;
    }
  
  if(isWeakCheck(a)) return itNone;
  
  for(string s: orb_error_messages) addMessage(s);

  if(wouldkill_there)
    wouldkill("%The1 would get you there!");
  if(wouldkill_here)
    wouldkill("%The1 would get you if you grew there!");

  #undef CHK
  #undef CHKV
  #undef CHK_ROLLBACK
  #undef INI
  
  return itNone;
  }

bool isValentines() {
  const time_t now = time(NULL);
  const struct tm *datetime = localtime(&now);

  // 0-indexed tm_mon, 1-indexed tm_mday
  // So this is February (2nd month), and the 14th day.
  return datetime->tm_mon == 1 && datetime->tm_mday == 14;
}

EX int orbcharges(eItem it) {
  switch(it) {
    case itRevolver: //pickup-key
      return 6 - items[itRevolver];
    case itOrbShield:
      return inv::on ? 30 : 20;
    case itOrbDiscord:
      return inv::on ? 46 : 23;
    case itOrbLove:
      return isValentines() ? 31 : 30;
    case itOrbUndeath:
    case itOrbSpeed: //"pickup-speed");
    case itOrbInvis:
    case itOrbAether:
      return 30;
    case itOrbGravity:
      return 45;
    case itOrbChoice:
      return 60;
    case itOrbIntensity:
      return inv::on ? 150 : 50;
    case itOrbWinter: // "pickup-winter"
       return inv::on ? 45 : 30;
    case itOrbBeauty:
    case itOrbEmpathy:
    case itOrbFreedom:
      return 40;
    case itOrbFrog: 
    case itOrbDash:
    case itOrbPhasing:
    case itOrbWoods:
      return 45;
    case itOrb37:
    case itOrbEnergy:
      return 50;
    case itOrbRecall:
    case itOrbNature:
    case itOrbStone:
    case itOrbStunning:
    case itOrbLuck:
      return 60;
    case itOrbWater:
    case itOrbMatter:
    case itOrbHorns:
    case itOrbBull:
    case itOrbShell:
    case itOrbAir:
    case itOrbSlaying:
      return 66;
    case itOrbTime:
    case itOrbSpace:
    case itOrbThorns:
    case itOrbLightning:
    case itOrbFlash:
    case itOrbIllusion:
    case itOrbPsi:
    case itOrbDigging:
    case itOrbTeleport:
    case itOrbMagnetism:
      return 77;
    case itOrbDomination:
      return 90;
    case itOrbSummon:
      return 120;     

    case itOrbSword:
      return 60 + 30 * multi::activePlayers();
    case itOrbSword2:
      return 40 + 20 * multi::activePlayers();
    case itOrbFish:
      return 20 + 10 * multi::activePlayers();
    case itOrbFire:
      return sphere ? 3 : 30;
    case itOrbDragon:
       return sphere ? 10 : 77;
    
    case itOrbMorph:
      return 60;
    
    case itOrbLava:
      return 50;
    
    case itOrbSide1:
    case itOrbSide2:
    case itOrbSide3:
      return 50;

    case itOrbImpact:
      return 50;

    case itOrbChaos:
      return 60;
       
    case itOrbPlague:
      return 30;
    
    case itOrbPurity:
      return 15;
       
    case itCurseWeakness:
      return 20;
       
    case itCurseDraining:
      return 30;
       
    case itCurseWater:
      return 20;
       
    case itCurseFatigue:
      return 30;
       
    case itCurseRepulsion:
      return 30;
       
    case itCurseGluttony:
      return 30;
       
    default:
      return 0;
    }
  }

EX bool isShmupLifeOrb(eItem it) {
  return 
    it == itOrbLife || it == itOrbFriend ||
    it == itOrbNature || it == itOrbEmpathy ||
    it == itOrbUndeath || it == itOrbLove ||
    it == itOrbDomination || it == itOrbGravity; 
  }

EX void makelava(cell *c, int i) {
  if(!pseudohept(c)) return;
  if(isPlayerOn(c)) return;
  if(c->wall == waFire && c->wparam < i)
    c->wparam = i, orbused[itOrbLava] = true;
  else if(makeflame(c, i, false)) orbused[itOrbLava] = true;
  }

EX void orboflava(int i) {
  if(items[itOrbLava]) 
    for(cell *c: dcal) {
      if(c->cpdist > 5) break;
      if(!c->monst || isFriendly(c) || survivesFire(c->monst)) continue;
      forCellEx(c2, c) makelava(c2, i);
      }
  }
}