#ifndef _DATABASE_H
#define _DATABASE_H

#include <gdbm.h>
#include <stdio.h>

typedef enum {database_read, database_write} database_permission;
int open_database(char* dbFileName, database_permission permission);
void close_database();
void pack_database();

typedef long FileID;
FileID add_file(char* fileName);
void add_file_property(FileID file, const char* property, const char* value);
char* lookup_file_property(FileID file, const char* property);
void print_all_properties(FileID fileid, FILE* to_file);

/* user must free up the memory since it is created using 'malloc' */
char* lookup_file(FileID id);

void add_word(char* word, FileID file, long score, long first_line);

typedef struct {
	FileID file;
	long score;
	long first_line;
} word_record;

/* returns the number of different files it is located in, sets the pointer
 * indicated by wordlist_alias to point to an allocated array of word_records.
 * this memory is allocated on the heap and must be freed by the recipient.
 */
int lookup_word(char* word, word_record** wordlist_alias);

#endif