/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 * 
 *  RetroArch 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 Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch 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 RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef __CONFIG_FILE_H
#define __CONFIG_FILE_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include "../boolean.h"
#include <stdio.h>
#include <stddef.h>

typedef struct config_file config_file_t;

/* Config file format
 * - # are treated as comments. Rest of the line is ignored.
 * - Format is: key = value. There can be as many spaces as you like in-between.
 * - Value can be wrapped inside "" for multiword strings. (foo = "hai u")
 * - #include includes a config file in-place.
 *
 * Path is relative to where config file was loaded unless an absolute path is chosen.
 * Key/value pairs from an #include are read-only, and cannot be modified.
 */

/* Loads a config file. Returns NULL if file doesn't exist.
 * NULL path will create an empty config file. */
config_file_t *config_file_new(const char *path);

/* Load a config file from a string. */
config_file_t *config_file_new_from_string(const char *from_string);

/* Frees config file. */
void config_file_free(config_file_t *conf);

/* Loads a new config, and appends its data to conf.
 * The key-value pairs of the new config file takes priority over the old. */
bool config_append_file(config_file_t *conf, const char *path);

/* All extract functions return true when value is valid and exists.
 * Returns false otherwise. */

bool config_entry_exists(config_file_t *conf, const char *entry);

struct config_entry_list;
struct config_file_entry
{
   const char *key;
   const char *value;
   /* Used intentionally. Opaque here. */
   const struct config_entry_list *next;
};

bool config_get_entry_list_head(config_file_t *conf, struct config_file_entry *entry);
bool config_get_entry_list_next(struct config_file_entry *entry);

/* Extracts a double from config file. */
bool config_get_double(config_file_t *conf, const char *entry, double *in);

/* Extracts a float from config file. */
bool config_get_float(config_file_t *conf, const char *entry, float *in);

/* Extracts an int from config file. */
bool config_get_int(config_file_t *conf, const char *entry, int *in);

/* Extracts an uint from config file. */
bool config_get_uint(config_file_t *conf, const char *entry, unsigned *in);

/* Extracts an uint64 from config file. */
bool config_get_uint64(config_file_t *conf, const char *entry, uint64_t *in);

/* Extracts an unsigned int from config file treating input as hex. */
bool config_get_hex(config_file_t *conf, const char *entry, unsigned *in);

/* Extracts a single char. If value consists of several chars, 
 * this is an error. */
bool config_get_char(config_file_t *conf, const char *entry, char *in);

/* Extracts an allocated string in *in. This must be free()-d if 
 * this function succeeds. */
bool config_get_string(config_file_t *conf, const char *entry, char **in);

/* Extracts a string to a preallocated buffer. Avoid memory allocation. */
bool config_get_array(config_file_t *conf, const char *entry, char *in, size_t size);

/* Extracts a string to a preallocated buffer. Avoid memory allocation.
 * Recognized magic like ~/. Similar to config_get_array() otherwise. */
bool config_get_path(config_file_t *conf, const char *entry, char *in, size_t size);

/* Extracts a boolean from config.
 * Valid boolean true are "true" and "1". Valid false are "false" and "0".
 * Other values will be treated as an error. */
bool config_get_bool(config_file_t *conf, const char *entry, bool *in);

/* Setters. Similar to the getters. 
 * Will not write to entry if the entry was obtained from an #include. */
void config_set_double(config_file_t *conf, const char *entry, double value);
void config_set_float(config_file_t *conf, const char *entry, float value);
void config_set_int(config_file_t *conf, const char *entry, int val);
void config_set_hex(config_file_t *conf, const char *entry, unsigned val);
void config_set_uint64(config_file_t *conf, const char *entry, uint64_t val);
void config_set_char(config_file_t *conf, const char *entry, char val);
void config_set_string(config_file_t *conf, const char *entry, const char *val);
void config_set_path(config_file_t *conf, const char *entry, const char *val);
void config_set_bool(config_file_t *conf, const char *entry, bool val);

/* Write the current config to a file. */
bool config_file_write(config_file_t *conf, const char *path);

/* Dump the current config to an already opened file.
 * Does not close the file. */
void config_file_dump(config_file_t *conf, FILE *file);

/* Also dumps inherited values, useful for logging. */
void config_file_dump_all(config_file_t *conf);

#ifdef __cplusplus
}
#endif

#endif