#include "bingo_pg_fix_pre.h"

extern "C"
{
#include "postgres.h"
#include "catalog/index.h"
#include "fmgr.h"
#include "storage/bufmgr.h"
#include "utils/rel.h"
#include "utils/relcache.h"
#if PG_VERSION_NUM / 100 >= 1200
#include "access/genam.h"
#endif
}

#include "bingo_pg_fix_post.h"

#include "bingo_pg_build.h"
#include "bingo_pg_common.h"
#include "bingo_pg_text.h"
#include "bingo_postgres.h"

#if PG_VERSION_NUM / 100 < 906
extern "C"
{

    BINGO_FUNCTION_EXPORT(bingo_insert);

    BINGO_FUNCTION_EXPORT(bingo_bulkdelete);

    BINGO_FUNCTION_EXPORT(bingo_vacuumcleanup);
}
#endif

/*
 *	Insert an index tuple into a bingo table.
 *
 */
#if PG_VERSION_NUM / 100 >= 1000
CEXPORT bool bingo_insert(Relation index, Datum* values, bool* isnull, ItemPointer ht_ctid, Relation heapRelation, IndexUniqueCheck checkUnique,
                          struct IndexInfo* indexInfo)
{
#elif PG_VERSION_NUM / 100 >= 906
CEXPORT bool bingo_insert(Relation index, Datum* values, bool* isnull, ItemPointer ht_ctid, Relation heapRelation, IndexUniqueCheck checkUnique)
{
#else
Datum bingo_insert(PG_FUNCTION_ARGS)
{
    Relation index = (Relation)PG_GETARG_POINTER(0);
    Datum* values = (Datum*)PG_GETARG_POINTER(1);
    bool* isnull = ((bool*)PG_GETARG_POINTER(2));
    ItemPointer ht_ctid = (ItemPointer)PG_GETARG_POINTER(3);
#endif

    /*
     * Skip inserting null tuples
     */
    if (*isnull)
#if PG_VERSION_NUM / 100 >= 906
        return false;
#else
        PG_RETURN_BOOL(false);
#endif

    bool result = false;

    PG_BINGO_BEGIN
    {
        BingoPgWrapper rel_namespace;
        const char* index_schema = rel_namespace.getRelNameSpace(index->rd_id);

        BingoPgBuild build_engine(index, 0, index_schema, false);
        /*
         * Insert a new structure
         */
        result = build_engine.insertStructureSingle(ht_ctid, values[0]);
    }
    PG_BINGO_END

    //#ifdef NOT_USED
    //	Relation	heapRel = (Relation) PG_GETARG_POINTER(4);
    //	IndexUniqueCheck checkUnique = (IndexUniqueCheck) PG_GETARG_INT32(5);
    //#endif
    //	IndexTuple	itup;
    //
    //	/* generate an index tuple */
    //	itup = _hash_form_tuple(rel, values, isnull);
    //	itup->t_tid = *ht_ctid;
    //
    //	/*
    //	 * If the single index key is null, we don't insert it into the index.
    //	 * Hash tables support scans on '='. Relational algebra says that A = B
    //	 * returns null if either A or B is null.  This means that no
    //	 * qualification used in an index scan could ever return true on a null
    //	 * attribute.  It also means that indices can't be used by ISNULL or
    //	 * NOTNULL scans, but that's an artifact of the strategy map architecture
    //	 * chosen in 1986, not of the way nulls are handled here.
    //	 */
    //	if (IndexTupleHasNulls(itup))
    //	{
    //		pfree(itup);
    //		PG_RETURN_BOOL(false);
    //	}
    //
    //	_hash_doinsert(rel, itup);
    //
    //	pfree(itup);

#if PG_VERSION_NUM / 100 >= 906
    return result;
#else
    PG_RETURN_BOOL(result);
#endif
}

/*
 * Bulk deletion of all index entries pointing to a set of heap tuples.
 * The set of target tuples is specified via a callback routine that tells
 * whether any given heap tuple (identified by ItemPointer) is being deleted.
 *
 * Result: a palloc'd struct containing statistical info for VACUUM displays.
 */

#if PG_VERSION_NUM / 100 >= 906
CEXPORT IndexBulkDeleteResult* bingo_bulkdelete(IndexVacuumInfo* info, IndexBulkDeleteResult* stats, IndexBulkDeleteCallback bulk_del_cb, void* cb_state)
{
#else
Datum bingo_bulkdelete(PG_FUNCTION_ARGS)
{
    IndexVacuumInfo* info = (IndexVacuumInfo*)PG_GETARG_POINTER(0);
    IndexBulkDeleteResult* stats = (IndexBulkDeleteResult*)PG_GETARG_POINTER(1);
    IndexBulkDeleteCallback bulk_del_cb = (IndexBulkDeleteCallback)PG_GETARG_POINTER(2);
    void* cb_state = (void*)PG_GETARG_POINTER(3);
#endif

    elog(NOTICE, "bingo.index: start bulk delete");

    PG_BINGO_BEGIN
    {
        /*
         * Initialize local variables
         */
        Relation index_rel = info->index;
        double tuples_removed = 0;
        ItemPointerData item_data;
        ItemPointer item_ptr = &item_data;
        BingoPgExternalBitset section_bitset(BINGO_MOLS_PER_SECTION);

        /*
         * Create index manager
         */
        BingoPgIndex bingo_index(index_rel);

        /*
         * Iterate through all the sections and search for removed tuples
         */
        int section_idx = bingo_index.readBegin();
        for (; section_idx != bingo_index.readEnd(); section_idx = bingo_index.readNext(section_idx))
        {
            bingo_index.getSectionBitset(section_idx, section_bitset);
            /*
             * Iterate through section structures
             */
            for (int mol_idx = section_bitset.begin(); mol_idx != section_bitset.end(); mol_idx = section_bitset.next(mol_idx))
            {
                bingo_index.readTidItem(section_idx, mol_idx, item_ptr);
                if (bulk_del_cb(item_ptr, cb_state))
                {
                    /*
                     * Remove the structure from the bingo index
                     */
                    bingo_index.removeStructure(section_idx, mol_idx);
                    tuples_removed += 1;
                }
            }
        }
        /*
         * Write new structures number
         */
        bingo_index.writeMetaInfo();
        /*
         * Always return null since no index values are removed
         */
        //      if (stats == NULL)
        //         stats = (IndexBulkDeleteResult *) palloc0(sizeof (IndexBulkDeleteResult));
        //
        //      stats->estimated_count = false;
        //      stats->tuples_removed = tuples_removed;
    }
    PG_BINGO_END
    /*
     * Always return null since no index values are removed
     */
#if PG_VERSION_NUM / 100 >= 906
    return NULL;
#else
    PG_RETURN_POINTER(NULL);
#endif
}

/*
 * Post-VACUUM cleanup.
 *
 * Result: a palloc'd struct containing statistical info for VACUUM displays.
 */
#if PG_VERSION_NUM / 100 >= 906
CEXPORT IndexBulkDeleteResult* bingo_vacuumcleanup(IndexVacuumInfo* info, IndexBulkDeleteResult* stats)
{
#else
Datum bingo_vacuumcleanup(PG_FUNCTION_ARGS)
{
    IndexVacuumInfo* info = (IndexVacuumInfo*)PG_GETARG_POINTER(0);
    IndexBulkDeleteResult* stats = (IndexBulkDeleteResult*)PG_GETARG_POINTER(1);
#endif

    Relation rel = info->index;
    BlockNumber num_pages = 0;

    elog(NOTICE, "bingo.index: start post-vacuum");
    /*
     * Always return null since no index values are removed
     */
#if PG_VERSION_NUM / 100 >= 906
    return NULL;
#else
    PG_RETURN_POINTER(NULL);
#endif
    //   /*
    //    * If bulkdelete wasn't called, return NULL signifying no change
    //    * Note: this covers the analyze_only case too
    //    */
    //   if (stats == NULL) {
    //      PG_RETURN_POINTER(NULL);
    //   }
    //   /*
    //    * update statistics
    //    */
    //   num_pages = RelationGetNumberOfBlocks(rel);
    //   stats->num_pages = num_pages;
    //   stats->num_index_tuples = 1;
    //   stats->estimated_count = false;
    //
    //   PG_RETURN_POINTER(stats);
}
