/*
    Authors:
        Pavel Březina <pbrezina@redhat.com>

    Copyright (C) 2015 Red Hat

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _SSS_COLONDB_H_
#define _SSS_COLONDB_H_

#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <talloc.h>

struct sss_colondb;

enum sss_colondb_mode {
    SSS_COLONDB_READ,
    SSS_COLONDB_WRITE
};

enum sss_colondb_type {
    SSS_COLONDB_UINT32,
    SSS_COLONDB_STRING,
    SSS_COLONDB_SENTINEL
};

union sss_colondb_write_data {
    uint32_t uint32;
    const char *str;
};

union sss_colondb_read_data {
    uint32_t *uint32;
    const char **str;
};

struct sss_colondb_write_field {
    enum sss_colondb_type type;
    union sss_colondb_write_data data;
};

struct sss_colondb_read_field {
    enum sss_colondb_type type;
    union sss_colondb_read_data data;
};

/**
 * Open colon DB and return connection.
 * @param[in|out] mem_ctx Memory context. Internal sss_colondb_close() is set
 *                        on destructor of this memory context.
 * @param[in] mode Open mode of db: SSS_COLONDB_READ or SSS_COLONDB_WRITE.
 * @param[in] filename Name of file.
 * @return Pointer to structure holding DB connection, or NULL if fail.
 */
struct sss_colondb *sss_colondb_open(TALLOC_CTX *mem_ctx,
                                     enum sss_colondb_mode mode,
                                     const char *filename);

/**
 * Read line from colon DB.
 * @param[in|out] mem_ctx Memory context.
 * @param[in] db  Pointer to structure holding DB connection.
 * @param[in|out] table Array of expected structure of line. It is expected
 *                      that last item has SSS_COLONDB_SENTINEL type.
 * @return EOK if success, else error code.
 */
errno_t sss_colondb_readline(TALLOC_CTX *mem_ctx,
                             struct sss_colondb *db,
                             struct sss_colondb_read_field *table);

/**
 * Write line to colon DB.
 * @param[in] db Pointer to structure holding DB connection.
 * @param[in] table Array with data. It is expected that last item has
 *                  SSS_COLONDB_SENTINEL type.
 * @return EOK if success, else error code.
 */
errno_t sss_colondb_writeline(struct sss_colondb *db,
                              struct sss_colondb_write_field *table);

#endif /* _SSS_COLONDB_H_ */