#include "btree_gist.h"
#include "btree_utils_var.h"
#include "utils/builtins.h"

/*
** Text ops
*/
PG_FUNCTION_INFO_V1(gbt_text_compress);
PG_FUNCTION_INFO_V1(gbt_bpchar_compress);
PG_FUNCTION_INFO_V1(gbt_text_union);
PG_FUNCTION_INFO_V1(gbt_text_picksplit);
PG_FUNCTION_INFO_V1(gbt_text_consistent);
PG_FUNCTION_INFO_V1(gbt_bpchar_consistent);
PG_FUNCTION_INFO_V1(gbt_text_penalty);
PG_FUNCTION_INFO_V1(gbt_text_same);

Datum    gbt_text_compress(PG_FUNCTION_ARGS);
Datum    gbt_bpchar_compress(PG_FUNCTION_ARGS);
Datum    gbt_text_union(PG_FUNCTION_ARGS);
Datum    gbt_text_picksplit(PG_FUNCTION_ARGS);
Datum    gbt_text_consistent(PG_FUNCTION_ARGS);
Datum    gbt_bpchar_consistent(PG_FUNCTION_ARGS);
Datum    gbt_text_penalty(PG_FUNCTION_ARGS);
Datum    gbt_text_same(PG_FUNCTION_ARGS);


/* define for comparison */

static bool     gbt_textgt     (const void *a, const void *b)
{
  return ( DatumGetBool(DirectFunctionCall2( text_gt ,PointerGetDatum( a ),PointerGetDatum( b ) ) ) );
}

static bool     gbt_textge     (const void *a, const void *b)
{
  return ( DatumGetBool(DirectFunctionCall2( text_ge ,PointerGetDatum( a ),PointerGetDatum( b ) ) ) );
}

static bool     gbt_texteq     (const void *a, const void *b)
{
  return ( DatumGetBool(DirectFunctionCall2( texteq ,PointerGetDatum( a ),PointerGetDatum( b ) ) ) );
}

static bool     gbt_textle     (const void *a, const void *b)
{
  return ( DatumGetBool(DirectFunctionCall2( text_le ,PointerGetDatum( a ),PointerGetDatum( b ) ) ) );
}

static bool     gbt_textlt     (const void *a, const void *b)
{
  return ( DatumGetBool(DirectFunctionCall2( text_lt ,PointerGetDatum( a ),PointerGetDatum( b ) ) ) );
}

static int32 gbt_textcmp ( const bytea * a , const bytea * b )
{
  return strcmp( VARDATA(a), VARDATA(b) );
}
  

/*
 * Converts data of leaf using strxfrm ( locale support )
*/

static bytea *
gbt_text_xfrm ( bytea * leaf )
{
    bytea  * out = leaf;

    int32  ilen = VARSIZE (leaf) - VARHDRSZ;
    int32  olen ;
    char   sin[ilen+1]; 
    char   * sou = NULL;
    memcpy ( (void*)&sin[0], (void*) VARDATA(leaf) ,ilen );
    sin[ilen]   = '\0';
    olen        = strxfrm ( NULL, &sin[0], 0 ) + 1;
    sou         = palloc ( olen );
    olen        = strxfrm ( sou , &sin[0] , olen );
    olen       += VARHDRSZ;
    out         = palloc ( olen + 1 );
    out->vl_len = olen+1;
    memcpy( (void*) VARDATA(out), sou, olen-VARHDRSZ );
    ((char*)out)[olen]   = '\0';
    pfree(sou);

    return out;
}


static GBT_VARKEY * gbt_text_l2n ( GBT_VARKEY * leaf )
{
 
  GBT_VARKEY   *out = leaf ;
  GBT_VARKEY_R r    = gbt_var_key_readable ( leaf );
  bytea * o ;

  o   = gbt_text_xfrm ( r.lower );
  r.lower = r.upper = o;
  out = gbt_var_key_copy ( &r , TRUE );
  pfree(o);

  return out;

}





static const gbtree_vinfo tinfo =
{
  gbt_t_text,
  TRUE,
  TRUE,
  gbt_textgt,
  gbt_textge,
  gbt_texteq,
  gbt_textle,
  gbt_textlt,
  gbt_textcmp,
  gbt_text_l2n
};



/**************************************************
 * Text ops
 **************************************************/


Datum
gbt_text_compress (PG_FUNCTION_ARGS)
{
  GISTENTRY        *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
  PG_RETURN_POINTER ( gbt_var_compress( entry, &tinfo ) );
}

Datum
gbt_bpchar_compress (PG_FUNCTION_ARGS)
{

  GISTENTRY        *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
  GISTENTRY        * retval ;

  if (entry->leafkey)
  {

    Datum          d = DirectFunctionCall1 ( rtrim1, entry->key );
    GISTENTRY * trim = palloc(sizeof(GISTENTRY));

    gistentryinit(*trim, d ,
              entry->rel, entry->page,
              entry->offset, VARSIZE(DatumGetPointer(d)), TRUE);
    retval = gbt_var_compress( trim , &tinfo ) ;

    pfree ( trim );
    pfree ( DatumGetPointer(d) );
  } else
    retval = entry;

  PG_RETURN_POINTER ( retval );
}



Datum
gbt_text_consistent(PG_FUNCTION_ARGS)
{
  GISTENTRY        *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
  GBT_VARKEY       *ktst  = (GBT_VARKEY   *) DatumGetPointer ( entry->key ) ;
  GBT_VARKEY        *key  = (GBT_VARKEY   *) DatumGetPointer ( PG_DETOAST_DATUM( entry->key ) );
  void             *qtst  = ( void * ) DatumGetPointer( PG_GETARG_DATUM(1) );
  void            *query  = ( void * ) DatumGetTextP  ( PG_GETARG_DATUM(1) );
  StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
  bool    retval          = FALSE;
  GBT_VARKEY_R          r =  gbt_var_key_readable ( key );

  if ( GIST_LEAF(entry) )
  {
    retval = gbt_var_consistent( &r, query, &strategy, TRUE, &tinfo );
  } else {
    bytea * q = gbt_text_xfrm ( ( bytea * ) query );
    retval    = gbt_var_consistent( &r, (void*)q, &strategy, FALSE, &tinfo );
    if ( q != query )
      pfree(q);
  }

  if ( ktst != key ){
    pfree ( key );
  }
  if ( qtst != query ){
    pfree ( query );
  }

  PG_RETURN_BOOL(retval);
}


Datum
gbt_bpchar_consistent(PG_FUNCTION_ARGS)
{
  GISTENTRY        *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
  GBT_VARKEY       *ktst  = (GBT_VARKEY   *) DatumGetPointer ( entry->key ) ;
  GBT_VARKEY        *key  = (GBT_VARKEY   *) DatumGetPointer ( PG_DETOAST_DATUM( entry->key ) );
  void             *qtst  = ( void * ) DatumGetPointer ( PG_GETARG_DATUM(1) );
  void            *query  = ( void * ) DatumGetPointer (PG_DETOAST_DATUM( PG_GETARG_DATUM(1) ) );
  void             *trim  = ( void * ) DatumGetPointer ( DirectFunctionCall1 ( rtrim1, PointerGetDatum ( query ) ) ) ;
  StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
  bool    retval          = FALSE;
  GBT_VARKEY_R          r =  gbt_var_key_readable ( key );

  if ( GIST_LEAF(entry) )
  {
    retval = gbt_var_consistent( &r, trim , &strategy, TRUE, &tinfo );
  } else {
    bytea * q = gbt_text_xfrm ( ( bytea * ) trim );
    retval    = gbt_var_consistent( &r, (void*)q, &strategy, FALSE, &tinfo );
    if ( q != trim )
      pfree(q);
  }

  pfree(trim);

  if ( ktst != key ){
    pfree ( key );
  }
  if ( qtst != query ){
    pfree ( query );
  }
  PG_RETURN_BOOL(retval);
}




Datum
gbt_text_union(PG_FUNCTION_ARGS)
{
    GistEntryVector   *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    int32                 *size = (int *) PG_GETARG_POINTER(1);
    PG_RETURN_POINTER( gbt_var_union ( entryvec , size , &tinfo ) );
}
 

Datum
gbt_text_picksplit(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    GIST_SPLITVEC          *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
    gbt_var_picksplit ( entryvec, v, &tinfo );
    PG_RETURN_POINTER(v);
}

Datum
gbt_text_same(PG_FUNCTION_ARGS)
{
    Datum d1 = PG_GETARG_DATUM(0);
    Datum d2 = PG_GETARG_DATUM(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);
    PG_RETURN_POINTER( gbt_var_same ( result, d1 , d2 , &tinfo ));
}


Datum
gbt_text_penalty(PG_FUNCTION_ARGS)
{
    float      *result   = (float *)     PG_GETARG_POINTER(2);
    GISTENTRY *      o   = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY *      n   = (GISTENTRY *) PG_GETARG_POINTER(1);
    PG_RETURN_POINTER( gbt_var_penalty ( result ,o , n, &tinfo ) );
}

