#define YAP_CPP_INTERFACE 1

#include "yapi.hh"

extern  "C" {
    
#include "YapInterface.h"
#include "blobs.h"
    
    char   *Yap_TermToString(Term t, char *s, size_t sz, size_t *length, encoding_t encoding, int flags);
    
    void YAP_UserCPredicate(const char *, YAP_UserCPred, YAP_Arity arity);
    void YAP_UserCPredicateWithArgs(const char *, YAP_UserCPred, YAP_Arity, YAP_Term);
    void YAP_UserBackCPredicate(const char *, YAP_UserCPred, YAP_UserCPred, YAP_Arity, unsigned int);
}


YAPAtomTerm::YAPAtomTerm(char *s) { // build string
  BACKUP_H();

  CACHE_REGS
    seq_tv_t inp, out;
  inp.val.c = s;
  inp.type = YAP_STRING_CHARS;
  out.type = YAP_STRING_ATOM;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( MkAtomTerm(out.val.a) );
  else t = 0L;
  RECOVER_H();
}


YAPAtomTerm::YAPAtomTerm(char *s, size_t len) { // build string
  BACKUP_H();

  CACHE_REGS
  seq_tv_t inp, out;
  inp.val.c = s;
  inp.type = YAP_STRING_CHARS;
  out.type = YAP_STRING_ATOM|YAP_STRING_NCHARS|YAP_STRING_TRUNC;
  out.sz = len;
  out.max = len;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( MkAtomTerm(out.val.a) );
  else t = 0L;
  RECOVER_H();
}

YAPAtomTerm::YAPAtomTerm(wchar_t *s): YAPTerm() { // build string
  BACKUP_H();

  CACHE_REGS
  seq_tv_t inp, out;
  inp.val.w = s;
  inp.type = YAP_STRING_WCHARS;
  out.type = YAP_STRING_ATOM;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( MkAtomTerm(out.val.a) );
  else t = 0L;
  RECOVER_H();
}


YAPAtomTerm::YAPAtomTerm(wchar_t *s, size_t len) : YAPTerm() { // build string
  BACKUP_H();

  CACHE_REGS
  seq_tv_t inp, out;
  inp.val.w = s;
  inp.type = YAP_STRING_WCHARS;
  out.type = YAP_STRING_ATOM|YAP_STRING_NCHARS|YAP_STRING_TRUNC;
  out.sz = len;
  out.max = len;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( MkAtomTerm(out.val.a) );
  else t = 0L;
  RECOVER_H();
}


YAPStringTerm::YAPStringTerm(char *s) { // build string
  BACKUP_H();

  CACHE_REGS
  seq_tv_t inp, out;
  inp.val.c = s;
  inp.type = YAP_STRING_CHARS;
  out.type = YAP_STRING_STRING;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( out.val.t );
  else t = 0L;
  RECOVER_H();
}


YAPStringTerm::YAPStringTerm(char *s, size_t len) { // build string
  BACKUP_H();

  CACHE_REGS

  seq_tv_t inp, out;
  inp.val.c = s;
  inp.type = YAP_STRING_CHARS;
  out.type = YAP_STRING_STRING|YAP_STRING_NCHARS|YAP_STRING_TRUNC;
  out.sz = len;
  out.max = len;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( out.val.t );
  else t = 0L;
  RECOVER_H();
}

YAPStringTerm::YAPStringTerm(wchar_t *s): YAPTerm() { // build string
  BACKUP_H();

  CACHE_REGS

  seq_tv_t inp, out;
  inp.val.w = s;
  inp.type = YAP_STRING_WCHARS;
  out.type = YAP_STRING_STRING;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( out.val.t );
  else t = 0L;
  RECOVER_H();
}


YAPStringTerm::YAPStringTerm(wchar_t *s, size_t len) : YAPTerm() { // build string
  BACKUP_H();

  CACHE_REGS

  seq_tv_t inp, out;
  inp.val.w = s;
  inp.type = YAP_STRING_WCHARS;
  out.type = YAP_STRING_STRING|YAP_STRING_NCHARS|YAP_STRING_TRUNC;
  out.sz = len;
  out.max = len;
  if (Yap_CVT_Text(&inp, &out PASS_REGS))
    mk ( out.val.t );
  else t = 0L;
  RECOVER_H();
}


YAPApplTerm::YAPApplTerm(YAPFunctor f, YAPTerm ts[]) : YAPTerm() {
  BACKUP_H();
  UInt arity = ArityOfFunctor(f.f);
  mk ( Yap_MkApplTerm( f.f, arity, (Term *)ts) );
  RECOVER_H();
}

YAPApplTerm::YAPApplTerm(YAPFunctor f) : YAPTerm() {
  BACKUP_H();
  UInt arity = ArityOfFunctor(f.f);
  mk ( Yap_MkNewApplTerm( f.f, arity) );
  RECOVER_H();
}

YAPTerm  YAPApplTerm::getArg(int arg) {
  BACKUP_H();
  YAPTerm to = YAPTerm( ArgOfTerm(arg, gt() ) );
  RECOVER_H();
  return to;
}

YAPFunctor  YAPApplTerm::getFunctor() {
  return YAPFunctor( FunctorOfTerm( gt( )) );
}

YAPPairTerm::YAPPairTerm(YAPTerm th, YAPTerm tl) : YAPTerm() {
  CACHE_REGS
    BACKUP_H();
  mk ( MkPairTerm( th.term(), tl.term() ) );
  RECOVER_H();
}

YAPPairTerm::YAPPairTerm() : YAPTerm() {
  BACKUP_H();
  t = Yap_MkNewPairTerm( );
  RECOVER_H();
}

void YAPTerm::mk(Term t0) { CACHE_REGS t = Yap_InitSlot( t0 );  }

Term YAPTerm::gt() { CACHE_REGS return Yap_GetFromSlot( t ); }

YAP_tag_t  YAPTerm::tag() {
  Term tt = gt( );
  if (IsVarTerm(tt)) {
      CELL *pt = VarOfTerm(tt);
      if (IsUnboundVar(pt)) {
	  CACHE_REGS
	  if (IsAttVar(pt))
	    return YAP_TAG_ATT;
	  return YAP_TAG_UNBOUND;
      }
      return YAP_TAG_REF;
  }
  if (IsPairTerm(tt))
    return YAP_TAG_PAIR;
  if (IsAtomOrIntTerm(tt)) {
      if (IsAtomTerm(tt))
	     return YAP_TAG_ATOM;
      return YAP_TAG_INT;
  } else {
    Functor f = FunctorOfTerm(tt);

      if (IsExtensionFunctor(f)) {
	  if (f == FunctorDBRef) {
	      return YAP_TAG_DBREF;
	  }
	  if (f == FunctorLongInt) {
	      return YAP_TAG_LONG_INT;
	  }
	  if (f == FunctorBigInt) {
	      big_blob_type bt = (big_blob_type)RepAppl(tt)[1];
	      switch (bt) {
		case BIG_INT:
		  return YAP_TAG_BIG_INT;
		case BIG_RATIONAL:
		  return YAP_TAG_RATIONAL;
		default:
		  return YAP_TAG_OPAQUE;
	      }
	  }
      }
      return YAP_TAG_APPL;
  }
}

YAPTerm  YAPTerm::deepCopy() {
  Term tn;
  BACKUP_MACHINE_REGS();

  tn = Yap_CopyTerm( gt() );

  RECOVER_MACHINE_REGS();
  return new YAPTerm( tn );
}

bool YAPTerm::exactlyEqual(YAPTerm t1) {
  int out;
  BACKUP_MACHINE_REGS();

  out = Yap_eq(gt(), t1.term());

  RECOVER_MACHINE_REGS();
  return out;
}

bool YAPTerm::unify(YAPTerm t1) {
  int out;
  BACKUP_MACHINE_REGS();

  out = Yap_unify(gt(), t1.term());

  RECOVER_MACHINE_REGS();
  return out;
}

bool YAPTerm::unifiable(YAPTerm t1) {
  int out;
  BACKUP_MACHINE_REGS();

  out = Yap_Unifiable(gt(), t1.term());

  RECOVER_MACHINE_REGS();
  return out;
}

bool YAPTerm::variant(YAPTerm t1) {
  int out;
  BACKUP_MACHINE_REGS();

  out = Yap_Variant(gt(), t1.term());

  RECOVER_MACHINE_REGS();
  return out;
}

intptr_t YAPTerm::hashTerm(size_t sz, size_t depth, bool variant) {
  intptr_t 	out;

  BACKUP_MACHINE_REGS();

  out =  Yap_TermHash(gt(), sz, depth, variant) ;

  RECOVER_MACHINE_REGS();
  return out;
}

const char *YAPTerm::text() {
    CACHE_REGS
  size_t sze = 4096, length;
  char *os = new char[4097];
  encoding_t enc = LOCAL_encoding;

  BACKUP_MACHINE_REGS();
  if (!(os = Yap_TermToString(t, os, sze, &length, enc, 0))) {      RECOVER_MACHINE_REGS();
      return (char *)NULL;
  }
  RECOVER_MACHINE_REGS();
  return os;
}

const char *YAPQuery::text() {

  return goal.text();
}


YAPIntegerTerm::YAPIntegerTerm(intptr_t i) { CACHE_REGS Term tn = MkIntegerTerm( i ); mk( tn ); }



/*
YAPTerm *YAPTerm::vars()
{
  BACKUP_MACHINE_REGS();
  CACHE_REGS
  YAPPairTerm lv = YAPPairTerm(Yap_TermVariables(gt(), 0 PASS_REGS));
  RECOVER_MACHINE_REGS();
  return lv;
}
 */

YAPTerm::YAPTerm(void *ptr) { CACHE_REGS mk( MkIntegerTerm( (Int)ptr )  );}

YAPTerm::YAPTerm(intptr_t i) { CACHE_REGS Term tn = MkIntegerTerm( i ); mk( tn ); }

YAPTerm YAPListTerm::car()
{
  Term to = gt();
  { LOG( "to=%lx",  to) ; }
  if (IsPairTerm(to))
    return YAPTerm(HeadOfTerm(to));
  else
    throw YAPError::YAP_DOMAIN_ERROR;
}

YAPVarTerm::YAPVarTerm() { CACHE_REGS mk( MkVarTerm( ) ); }


char *YAPAtom::getName(void) {
  if (IsWideAtom(a)) {
      // return an UTF-8 version
      size_t sz = 512;
      wchar_t * ptr =  a->WStrOfAE;
      int ch = -1;
      char *s = new char[sz], *op = s;
      while (ch) {
	  ch = *ptr++;
	  utf8_put_char( op, ch );
      }
      sz = strlen(s)+1;
      char *os = new char[sz];
      memcpy(os, s, sz);
      delete[] s;
      return os;
  } else if (IsBlob(a)) {
      size_t sz = 1024;
      char *s = new char [sz+1];
      return Yap_blob_to_string( RepAtom(a) , s, sz);
  } else {
      return a->StrOfAE;
  }
}

void YAPQuery::initOpenQ() {
    CACHE_REGS
    oq = LOCAL_execution;
    LOCAL_execution = this;
    q_open=1;
    q_state=0;
    q_flags = true ; //PL_Q_PASS_EXCEPTION;

    q_p = P;
    q_cp = CP;
}

void
YAPQuery::initQuery( Term t )
{
    CACHE_REGS
  BACKUP_MACHINE_REGS();
  arity_t arity = ap->ArityOfPE;
  goal = YAPTerm( t );
  if (arity) {
    q_g = Yap_InitSlots( arity, RepAppl(t) + 1);
  } else {
    q_g = 0;
  }
  initOpenQ();
  RECOVER_MACHINE_REGS();
}

void
YAPQuery::initQuery( YAPTerm ts[], arity_t arity )
{
  CACHE_REGS

  BACKUP_MACHINE_REGS();
  if (arity) {
    q_g = Yap_NewSlots( arity );
    for (arity_t i=0; i < arity; i++) {
      Yap_PutInSlot(q_g+i, ts[i].term() PASS_REGS);
    }
    Term t = Yap_MkApplTerm(ap->FunctorOfPred, ap->ArityOfPE, Yap_AddressFromSlot(q_g));
    goal = YAPTerm( t );
  } else {
    q_g = 0;
    goal = YAPTerm( MkAtomTerm((Atom)ap->FunctorOfPred) );
  }
  initOpenQ();
  RECOVER_MACHINE_REGS();
}


YAPQuery::YAPQuery(YAPFunctor f, YAPTerm mod, YAPTerm ts[]): YAPPredicate(f, mod)
{
  /* ignore flags  for now */
  initQuery( ts , f.arity());
}

YAPQuery::YAPQuery(YAPFunctor f, YAPTerm ts[]): YAPPredicate(f)
{
  /* ignore flags for now */
  initQuery( ts , f.arity());
}

YAPQuery::YAPQuery(YAPPredicate p, YAPTerm ts[]): YAPPredicate(p.ap)
{
  initQuery( ts , p.ap->ArityOfPE);
}

YAPListTerm YAPQuery::namedVars() {
  CACHE_REGS
  Term o = Yap_GetFromSlot( vnames );
  return YAPListTerm( o );
}

bool YAPQuery::next()
{
  CACHE_REGS
  int result;

  BACKUP_MACHINE_REGS();
  if (q_open != 1) return false;
  if (setjmp(q_env))
    return false;
   // don't forget, on success these guys must create slots
  if (this->q_state == 0) {
    result = (bool)YAP_EnterGoal((YAP_PredEntryPtr)ap, q_g, &q_h);
  } else {
      LOCAL_AllowRestart = q_open;
      result = (bool)YAP_RetryGoal(&q_h);
  }
  q_state = 1;
  if (!result) {
      YAP_LeaveGoal(FALSE, &q_h);
      q_open = 0;
  }
  RECOVER_MACHINE_REGS();
  return result;
}

void YAPQuery::cut()
{
  CACHE_REGS

  BACKUP_MACHINE_REGS();
  if (q_open != 1 || q_state == 0) return;
  YAP_LeaveGoal(FALSE, &q_h);
  q_open = 0;
  LOCAL_execution = this;
  RECOVER_MACHINE_REGS();
}

void YAPQuery::close()
{
  CACHE_REGS

  RECOVER_MACHINE_REGS();
  if (EX /* && !(q_flags & (true PL_Q_CATCH_EXCEPTION)) */) {
      EX = (struct DB_TERM *)NULL;
  }
  /* need to implement backtracking here */
  if (q_open != 1 || q_state == 0) {
      RECOVER_MACHINE_REGS();
      return;
  }
  YAP_LeaveGoal(FALSE, &q_h);
  q_open = 0;
  LOCAL_execution = this;
  RECOVER_MACHINE_REGS();
}

static YAPEngine *curren;

#if __ANDROID__

#include <jni.h>
#include <string.h>

JNIEnv *Yap_jenv;

JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
  JNIEnv* env;
  if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
      return -1;
  }
  Yap_jenv = env;
  return JNI_VERSION_1_6;
}

extern char *Yap_AndroidBufp;
static size_t Yap_AndroidMax, Yap_AndroidSz;

extern void(*Yap_DisplayWithJava)(int c);

static void
displayWithJava(int c)
{
  char *ptr = Yap_AndroidBufp;
  ptr[ Yap_AndroidSz++ ] = c;
  if (Yap_AndroidMax-1 == Yap_AndroidSz) {
      if (Yap_AndroidMax < 32*1024) {
	  Yap_AndroidMax *= 2;
      } else {
	  Yap_AndroidMax += 32*1024;
      }
      Yap_AndroidBufp = (char *)realloc( ptr, Yap_AndroidMax);
  }
  Yap_AndroidBufp[Yap_AndroidSz] = '\0';
  if (c == '\n' ) {
      Yap_AndroidBufp[Yap_AndroidSz] = '\0';
      curren->run(Yap_AndroidBufp);
      Yap_AndroidSz = 0;
  }
}

extern "C" void Java_pt_up_fc_dcc_yap_JavaYap_load(JNIEnv *env0, jobject obj, jobject mgr);

extern "C" void Java_pt_up_fc_dcc_yap_JavaYap_load
     (JNIEnv *env0, jobject obj, jobject asset_manager)
{
  AAssetManager *mgr = AAssetManager_fromJava(Yap_jenv, asset_manager);
  if (mgr == NULL) {
    LOG( "we're doomed, mgr = 0; bip bip bip");
  } else {
    Yap_assetManager = mgr;
  }
}


#endif


YAPEngine::YAPEngine( char *savedState,
                             size_t stackSize,
                             size_t trailSize,
                             size_t maxStackSize,
                             size_t maxTrailSize,
                             char *libDir,
                             char *bootFile,
                             char *goal,
                             char *topLevel,
                             bool script,
                             bool fastBoot,
                             YAPCallback *cb):  _callback(0)
{ // a single engine can be active
#if __ANDROID__
  Yap_DisplayWithJava = displayWithJava;
  Yap_AndroidBufp = (char *)malloc(Yap_AndroidMax = 4096);
  Yap_AndroidBufp[0] = '\0';
  Yap_AndroidSz = 0;
#endif
  memset((void *)&init_args, 0, sizeof(init_args));
  init_args.SavedState = savedState;
  init_args.StackSize = stackSize;
  init_args.TrailSize = trailSize;
  init_args.MaxStackSize = maxStackSize;
  init_args.MaxTrailSize = maxTrailSize;
  init_args.YapLibDir = libDir;
  init_args.YapPrologBootFile = bootFile;
  init_args.YapPrologGoal = goal;
  init_args.YapPrologTopLevelGoal = topLevel;
  init_args.HaltAfterConsult = script;
  init_args.FastBoot = fastBoot;
  delYAPCallback();
  if (cb) setYAPCallback(cb);
  curren = this;
  if (YAP_Init( &init_args ) == YAP_BOOT_ERROR)
    throw(YAPError::YAP_OTHER_ERROR);
}


YAPPredicate::YAPPredicate(YAPAtom at) {
  CACHE_REGS
    ap = RepPredProp(PredPropByAtom(at.a,Yap_CurrentModule()));
}

YAPPredicate::YAPPredicate(YAPAtom at, arity_t arity) {
  CACHE_REGS
    if (arity) {
      Functor f = Yap_MkFunctor(at.a, arity);
      ap = RepPredProp(PredPropByFunc(f,Yap_CurrentModule()));
    } else {
      ap = RepPredProp(PredPropByAtom(at.a,Yap_CurrentModule()));
    }
}

/// auxiliary routine to find a predicate in the current module.
PredEntry  *YAPPredicate::getPred( Term &t, Term* &outp ) {
  CACHE_REGS
    Term m = Yap_CurrentModule() ;
  t = Yap_StripModule(t, &m);
  if (IsVarTerm(t) || IsNumTerm(t)) {
    throw YAPError::YAP_TYPE_ERROR;
  }
  if (IsAtomTerm(t)) {
    ap = RepPredProp(PredPropByAtom(AtomOfTerm(t), m));
    outp = (Term  *)NULL;
    return ap;
  }  else if (IsPairTerm(t)) {
    Term ts[2];
    ts[0] = t;
    ts[1] = m;
    t = Yap_MkApplTerm(FunctorCsult, 2, ts);
  }
  Functor f = FunctorOfTerm(t);
  if (IsExtensionFunctor(f)) {
    throw YAPError::YAP_TYPE_ERROR;
  } else {
      ap = RepPredProp(PredPropByFunc(f, m));
      outp = RepAppl(t)+1;
  }
  return ap;
}


YAPPrologPredicate::YAPPrologPredicate(YAPAtom name,
                                       arity_t arity,
                                       YAPModule mod,
                                       bool tabled,
                                       bool logical_updates,
                                       bool thread_local,
                                       bool sourced,
                                       bool discontiguous,
                                       bool multiFile,
                                       bool hidden,
                                       bool untraceable,
                                       bool unspyable,
                                       bool meta,
                                       bool moduleTransparent,
                                       bool quasiQuotable,
                                       size_t mega_clause
                                       ) : YAPPredicate(name, arity, mod) {
  if (!ap) return;
  if (thread_local) {
    if (ap->cs.p_code.NOfClauses || tabled)
      return;
    ap->PredFlags |= (ThreadLocalPredFlag|LogUpdatePredFlag);
  } else if (logical_updates) {
    if (ap->cs.p_code.NOfClauses || tabled)
      return;
    ap->PredFlags |= LogUpdatePredFlag;
    ap->CodeOfPred = FAILCODE;
    ap->OpcodeOfPred = FAILCODE->opc;
  }
  if (tabled) {
    ap->PredFlags |= TabledPredFlag;
    if (ap->cs.p_code.NOfClauses || tabled)
      return;
    ap->PredFlags |= TabledPredFlag;
  }
  if (sourced) {
    ap->PredFlags |= SourcePredFlag;
  }
  if (discontiguous) {
    ap->PredFlags |= DiscontiguousPredFlag;
  }
  if (multiFile) {
    ap->PredFlags |= MultiFileFlag;
  }
  if (hidden) {
    ap->PredFlags |= HiddenPredFlag;
  }
  if (untraceable) {
    ap->PredFlags |= SourcePredFlag;
  }
  if (unspyable) {
    ap->PredFlags |= NoSpyPredFlag;
  }
  if (meta) {
    ap->PredFlags |= MetaPredFlag;
  } else if (moduleTransparent) {
    ap->PredFlags |= ModuleTransparentPredFlag;
  }
  if (quasiQuotable) {
    ap->PredFlags |= QuasiQuotationPredFlag;
  }
  if (untraceable) {
    ap->PredFlags |= SourcePredFlag;
  }
  if (hidden) {
    ap->PredFlags |= SourcePredFlag;
  }
}

void *YAPPrologPredicate::assertClause( YAPTerm clause, bool last, YAPTerm source) {
  CACHE_REGS

  RECOVER_MACHINE_REGS();
    Term tt = clause.gt();
  Term sourcet  = source.gt();
  yamop *codeaddr = Yap_cclause(tt, PP->ArityOfPE, Yap_CurrentModule(), sourcet); /* vsc: give the number of arguments
                                                                               to cclause in case there is overflow */
  Term ntt = clause.gt();
  if (LOCAL_ErrorMessage) {
      RECOVER_MACHINE_REGS();
      return 0;
  }
  Term *tref = &ntt;
  if (Yap_addclause(ntt, codeaddr, (last ? 0 : 2), Yap_CurrentModule(), tref)) {
    RECOVER_MACHINE_REGS();
  }
    return tref;
  return 0;
}
void* YAPPrologPredicate::retractClause( YAPTerm skeleton, bool all) {
  return 0;
}
void* YAPPrologPredicate::clause( YAPTerm skeleton, YAPTerm &body ) {
  return 0;
}