/* Copyright  (C) 2010-2015 The RetroArch team
 *
 * ---------------------------------------------------------------------------------------
 * The following license statement only applies to this file (config_file.h).
 * ---------------------------------------------------------------------------------------
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#ifndef __LIBRETRO_SDK_CONFIG_FILE_H
#define __LIBRETRO_SDK_CONFIG_FILE_H

#ifdef __cplusplus
extern "C" {
#endif

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

struct config_entry_list
{
   /* If we got this from an #include,
    * do not allow overwrite. */
   bool readonly;
   char *key;
   char *value;
   struct config_entry_list *next;
};

struct config_include_list
{
   char *path;
   struct config_include_list *next;
};

struct config_file
{
   char *path;
   struct config_entry_list *entries;
   struct config_entry_list *tail;
   unsigned include_depth;

   struct config_include_list *includes;
};

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);

#ifdef __cplusplus
}
#endif

#endif

