#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
 
#include <fcntl.h>
#include <math.h>
#include <time.h>
#include <sys/time.h>
#include <sys/stat.h> 
 
#include "lmdb.h"
 
#define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr)
#define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0))
#define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \
    "%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))
 
#define TEST_DB_DIR     "./testdb"
 
int main(int argc,char * argv[])
{
    int i = 0, j = 0, rc;
    MDB_env *env;
    MDB_dbi dbi;
    MDB_val key, data;
    MDB_txn *txn;
    MDB_stat mst;
    MDB_cursor *cursor, *cur2;
    MDB_cursor_op op;
    int count;
    int *values;
    char sval[32] = "";
 
mkdir(TEST_DB_DIR, S_IRWXU | S_IRWXG | S_IRWXO);
 
    srand(time(NULL));
 
        count = (rand()%384) + 64;
        values = (int *)malloc(count*sizeof(int));
 
        for(i = 0;i<count;i++) {
            values[i] = rand()%1024;
        }
    
        E(mdb_env_create(&env));
        E(mdb_env_set_maxreaders(env, 1));
        E(mdb_env_set_mapsize(env, 10485760));
        E(mdb_env_open(env, TEST_DB_DIR, MDB_FIXEDMAP /*|MDB_NOSYNC*/, 0664));
 
        E(mdb_txn_begin(env, NULL, 0, &txn));
        E(mdb_dbi_open(txn, NULL, 0, &dbi));
   
        key.mv_size = sizeof(int);
        key.mv_data = sval;
 
        printf("Adding %d values\n", count);
        for (i=0;i<count;i++) { 
            sprintf(sval, "%03x %d foo bar", values[i], values[i]);
            /* Set <data> in each iteration, since MDB_NOOVERWRITE may modify it */
            data.mv_size = sizeof(sval);
            data.mv_data = sval;
            if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE))) {
                j++;
                data.mv_size = sizeof(sval);
                data.mv_data = sval;
            }
        }
        if (j) printf("%d duplicates skipped\n", j);
        E(mdb_txn_commit(txn));
        E(mdb_env_stat(env, &mst));
 
        E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
        E(mdb_cursor_open(txn, dbi, &cursor));
        while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
            printf("key: %p %.*s, data: %p %.*s\n",
                key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
                data.mv_data, (int) data.mv_size, (char *) data.mv_data);
        }
        CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
        mdb_cursor_close(cursor);
        mdb_txn_abort(txn);
 
        j=0;
        key.mv_data = sval;
        for (i= count - 1; i > -1; i-= (rand()%5)) {
            j++;
            txn=NULL;
            E(mdb_txn_begin(env, NULL, 0, &txn));
            sprintf(sval, "%03x ", values[i]);
            if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) {
                j--;
                mdb_txn_abort(txn);
            } else {
                E(mdb_txn_commit(txn));
            }
        }
        free(values);
        printf("Deleted %d values\n", j);
 
        E(mdb_env_stat(env, &mst));
        E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn));
        E(mdb_cursor_open(txn, dbi, &cursor));
        printf("Cursor next\n");
        while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) {
            printf("key: %.*s, data: %.*s\n",
                (int) key.mv_size,  (char *) key.mv_data,
                (int) data.mv_size, (char *) data.mv_data);
        }
        CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
        printf("Cursor last\n");
        E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
        printf("key: %.*s, data: %.*s\n",
            (int) key.mv_size,  (char *) key.mv_data,
            (int) data.mv_size, (char *) data.mv_data);
        printf("Cursor prev\n");
        while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) {
            printf("key: %.*s, data: %.*s\n",
                (int) key.mv_size,  (char *) key.mv_data,
                (int) data.mv_size, (char *) data.mv_data);
        }
        CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get");
        printf("Cursor last/prev\n");
        E(mdb_cursor_get(cursor, &key, &data, MDB_LAST));
            printf("key: %.*s, data: %.*s\n",
                (int) key.mv_size,  (char *) key.mv_data,
                (int) data.mv_size, (char *) data.mv_data);
        E(mdb_cursor_get(cursor, &key, &data, MDB_PREV));
            printf("key: %.*s, data: %.*s\n",
                (int) key.mv_size,  (char *) key.mv_data,
                (int) data.mv_size, (char *) data.mv_data);
 
        mdb_cursor_close(cursor);
        mdb_txn_abort(txn);
 
        printf("Deleting with cursor\n");
        E(mdb_txn_begin(env, NULL, 0, &txn));
        E(mdb_cursor_open(txn, dbi, &cur2));
        for (i=0; i<50; i++) {
            if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, MDB_NEXT)))
                break;
            printf("key: %p %.*s, data: %p %.*s\n",
                key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
                data.mv_data, (int) data.mv_size, (char *) data.mv_data);
            E(mdb_del(txn, dbi, &key, NULL));
        }
 
        printf("Restarting cursor in txn\n");
        for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
            if (RES(MDB_NOTFOUND, mdb_cursor_get(cur2, &key, &data, op)))
                break;
            printf("key: %p %.*s, data: %p %.*s\n",
                key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
                data.mv_data, (int) data.mv_size, (char *) data.mv_data);
        }
        mdb_cursor_close(cur2);
        E(mdb_txn_commit(txn));
 
        printf("Restarting cursor outside txn\n");
        E(mdb_txn_begin(env, NULL, 0, &txn));
        E(mdb_cursor_open(txn, dbi, &cursor));
        for (op=MDB_FIRST, i=0; i<=32; op=MDB_NEXT, i++) {
            if (RES(MDB_NOTFOUND, mdb_cursor_get(cursor, &key, &data, op)))
                break;
            printf("key: %p %.*s, data: %p %.*s\n",
                key.mv_data,  (int) key.mv_size,  (char *) key.mv_data,
                data.mv_data, (int) data.mv_size, (char *) data.mv_data);
        }
        mdb_cursor_close(cursor);
        mdb_txn_abort(txn);
 
        mdb_dbi_close(env, dbi);
        mdb_env_close(env);
 
    return 0;
}