/****************************************************************************
 * OBIDMS array header file	                                                *
 ****************************************************************************/

/**
 * @file array.h
 * @author Celine Mercier
 * @date October 19th 2015
 * @brief Header file for handling arrays for storing and retrieving data arrays (i.e. character strings).
 */


#ifndef ARRAY_H_
#define ARRAY_H_


#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <sys/types.h>
#include <dirent.h>

#include "obidms.h"
#include "obitypes.h"


#define ARRAY_MAX_NAME (2048) 		/**< The maximum length of an array name.
                              	  	 */
#define ARRAY_GROWTH_FACTOR (2)		/**< The growth factor when an array is enlarged.
                                	 */

typedef int32_t index_t;	/**< Type of the array indices.
 	 	 	 	 	 	 	 */
typedef char byte_t;		/**< Defining byte type since data is stored in bits
							 *	 and char (stored on one byte) is the smallest addressable unit.
 	 	 	 	 	 	 	 */


/**
 * @brief OBIDMS array data header structure.
 */
typedef struct OBIDMS_array_data_header {
	int			header_size;						/**< Size of the header in bytes.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	int64_t		data_size_used;						/**< Size of the data used in bytes.	// TODO not sure about type
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	int64_t		data_size_max;						/**< Max size of the data in bytes.		// TODO not sure about type
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	index_t		nb_items;							/**< Number of items.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	char    	array_name[ARRAY_MAX_NAME+1];		/**< The array name as a NULL terminated string.
													 */
	time_t		creation_date;			    	    /**< Date of creation of the file.
												     */
} OBIDMS_array_data_header_t, *OBIDMS_array_data_header_p;


/**
 * @brief OBIDMS array data structure.
 */
typedef struct OBIDMS_array_data {
	OBIDMS_array_data_header_p	header; 		 	/**< A pointer to the header of the array data.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	byte_t*                   	data;   		 	/**< A pointer to the beginning of the data.
													 */
} OBIDMS_array_data_t, *OBIDMS_array_data_p;


/**
 * @brief OBIDMS array header structure.
 */
typedef struct OBIDMS_array_header {
	int			header_size;						/**< Size of the header in bytes.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	index_t		nb_items;							/**< Number of items in the array.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	index_t		nb_items_max;						/**< Maximum number of items in the array before it has to be enlarged.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	char    	array_name[ARRAY_MAX_NAME+1];		/**< The array name as a NULL terminated string.
													 */
	time_t		creation_date;			    	    /**< Date of creation of the file.
												     */
} OBIDMS_array_header_t, *OBIDMS_array_header_p;


/**
 * @brief OBIDMS array structure.
 */
typedef struct OBIDMS_array {
	OBIDMS_array_header_p		header; 		 	/**< A pointer to the header of the array.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	index_t*                 	first;   		 	/**< A pointer to the beginning of the array itself.
													 */
	OBIDMS_array_data_p			data;				/**< A pointer to the structure containing the data
													 *   that the array references.
	 	 	 	 	 	 	 	 	 	 	 	 	 */
	DIR*						directory;			/**< A directory entry usable to
										 	 	 	 *    refer and scan the array directory.
										 	 	 	 */
} OBIDMS_array_t, *OBIDMS_array_p;


/**
 *
 */
int obi_array_exists(OBIDMS_p dms, const char* array_name);


/**
 *
 */
OBIDMS_array_p obi_array(OBIDMS_p dms, const char* array_name);


/**
 *
 */
OBIDMS_array_p obi_create_array(OBIDMS_p dms, const char* array_name);


/**
 *
 */
OBIDMS_array_p obi_open_array(OBIDMS_p dms, const char* array_name);


/**
 *
 */
int obi_close_array(OBIDMS_array_p array);


/**
 *
 */
//int obi_delete_array(OBIDMS_p dms, const char* array_name);


/**
 * The header is already in the byte array
 */
index_t obi_array_add(OBIDMS_array_p array, byte_t* value);


/**
 * Returns the entire array including the header
 */
byte_t* obi_array_get(OBIDMS_array_p array, index_t index);


/**
 *
 */
index_t obi_array_search(OBIDMS_array_p array, byte_t* value);


/**
 *
 */
byte_t* obi_str_to_obibytes(char* value);


/**
 *
 */
const char* obi_obibytes_to_str(byte_t* value_b);


/**
 *	TODO LATER
 */
// OBIDMS_array_p obi_column_arrayify(FILE, encoding);


#endif /* ARRAY_H_ */