#ifndef _EASYCSV
#define _EASYCSV

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/sendfile.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <stdint.h>

#include "easycsv_error.h"

/* Generic type definitions for internal use */

typedef uint32_t row_t; // max length of 2^32 - 1
typedef uint32_t column_t;
typedef char* rowstr; // non-const, to free it after usage

/** Flags for error messages */
typedef enum {
  EASYCSV_ERRORSTDERR = 0,
  EASYCSV_ERROROFF,
  EASYCSV_ERRORSTDOUT
} EASYCSV_ERRORMSG;

/** Flags to facilitate changing modes during file copying phases */
typedef enum {
  EASYCSV_UNKNOWNMODE = 0,
  EASYCSV_R,
  EASYCSV_W
} EASYCSV_MODE;

/** Flags to parameterise the easycsv_insertvalue */
typedef enum {
  EASYCSV_REPLACE, ///< (default) replaces word
  EASYCSV_CONCAT, ///< concantates word at the end
  EASYCSV_RCONCAT, ///< concantates word from the start
} EASYCSV_VALMODE;

/** Flags to parameterise sorting */
typedef enum {
  EASYCSV_ALPHA, ///< sort alphabetically
  EASYCSV_RALPHA, ///< sort reverse alphabetically
  EASYCSV_NUMER, ///< sort numerically, from lowest value to highest
  EASYCSV_RNUMER ///< sort from highest value to lowest
} EASYCSV_SORT;

/* Flags denoting cell type */
typedef enum {
  EASYCSV_NONE,
  EASYCSV_STRING,
  EASYCSV_INT,
  EASYCSV_FLOAT,
  EASYCSV_UNKNOWNTYPE
} _EASYCSV_TYPE;

/* Private easycsv members */
typedef struct _easycsv {
  FILE *file; // original CSV file
  FILE *temp; // temporary CSV file for writing
  char *fp;
  char *tmpfp;
  unsigned int rows;
  unsigned int cols;
  EASYCSV_ERRORMSG error;
#ifdef EASYCSV_DEBUG
  clock_t start;
#endif
} _easycsv;

/* (Constructor) Initialise _easycsv */
_easycsv*
_easycsv_priv_init(const char*,
		   const EASYCSV_MODE,
		   const EASYCSV_ERRORMSG);

/* (Destructor) Free _easycsv memory */
void
_easycsv_priv_free(_easycsv*);

/* Verifies mode of file */
// int _easycsv_checkmode(struct easycsv*, const char);

/* Copies data from temp FILE to file FILE */
int
_easycsv_update(_easycsv*);

/* Rewind easycsv, checks for readability */
int
_easycsv_rewind(_easycsv*,
		const EASYCSV_MODE);

/* Returns string of a specific row, 
   includes the '\n' character as well! */
char*
_easycsv_getrow(const _easycsv*,
		const unsigned int);

/* Return column number of a named column */
int
_easycsv_getcolumn(const _easycsv*,
		   const char*);

/* Verifies the type of the value (eg: string or int) */
_EASYCSV_TYPE
_easycsv_checktype(const _easycsv*,
		   const int,
		   const int);

/* Verifies if there is a value or not */
int
_easycsv_checkifvalue(const _easycsv*,
		      const int,
		      const int);

/* Grab const char* in row */ 
char*
_easycsv_getvalueinrow(const _easycsv*,
		       const char*,
		       const unsigned int);

/* Returns char pointer to start of value in rowstr */
char*
_easycsv_setcharptovalue(const _easycsv*,
			 const char*,
			 const unsigned int);

/* Insert value in row in specific column */
char*
_easycsv_insertvalueinrow(const _easycsv*,
			  const char*,
			  const char*,
			  const unsigned int);

/* Calculate rows */
int
_easycsv_rows(_easycsv*,
	      const EASYCSV_MODE);

/* Calculate columns*/
int
_easycsv_columns(_easycsv*,
		 const EASYCSV_MODE);

void
_easycsv_printerror(const _easycsv*,
		    const EASYCSV_ERROR);

/* Print error from _easycsv struct in stderr */
void
_easycsv_geterror(const _easycsv*,
		  const EASYCSV_ERROR,
		  FILE*);

/* Check if easycsv* and const char* are NULL */
int
_easycsv_checkcsvandstring_one(const _easycsv*,
			       const char*);

/* Check if easycsv* and two const char* are NULL*/
int
_easycsv_checkcsvandstring_two(const _easycsv*,
			       const char*,
			       const char*);

/* Verifies if the string is not NULL or empty, returns 0 on success and -1 on failure */
// int _easycsv_checkstring(const char*);

/* Verifies if easycsv is not NULL or unallocated */
// int _easycsv_checkeasycsv(const struct easycsv*);

/* Verifies if int is  */
// int _easycsv_checkunsigned(const int);

#endif