#ifndef EASYCSV_H
#define EASYCSV_H

#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>

/* Flags for error messages */
typedef enum {
  EASYCSV_ERRORSTDERR = 0, // default
  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;

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;

typedef struct _easycsv _easycsv;

/* Public easycsv members  */
typedef struct easycsv {
  EASYCSV_MODE mode; // end users able to easily modify mode to their needs
  _easycsv *_priv; // private members
} easycsv;

/*
 * ============================
 * FUNCTION PROTOTYPES - PUBLIC
 * ============================
 */

/* CONSTRUCTORS AND DESTRUCTORS */

/* (Constructor) Initialise easycsv */
easycsv*
easycsv_init(const char*,
	     const EASYCSV_MODE);

/* (Constructor) Initialise easycsv with error message option */
easycsv*
easycsv_init_errormsg(const char*,
		      const EASYCSV_MODE,
		      const EASYCSV_ERRORMSG);

/* (Destructor) Free easycsv memory */
void
easycsv_free(easycsv*);

/* GENERIC ALGORITHMS */

/* Find value and returns row and column in unsigned int pointers */
int
easycsv_findvalue(const easycsv*,
		  const char*,
		  unsigned int*,
		  unsigned int*);

/* Find number of instances of value */
int
easycsv_findnumvalue(const easycsv*,
		     const char*);

int
easycsv_sortrow(easycsv*,
		const char*,
		const EASYCSV_SORT);

int
easycsv_sortcolumn(easycsv*,
		   const char*,
		   const EASYCSV_SORT);

/* Append to CSV files */
int
easycsv_appendcsv(easycsv*,
		  easycsv*);

int
easycsv_compress(easycsv*);

/* READ VALUE */

/* Read string in a specific cell */
char*
easycsv_readvalue(const easycsv*,
		  const unsigned int,
		  const unsigned int);

/* Read string in a specific cell with named column in row 1 */
char*
easycsv_readcolumnvalue(const easycsv*,
			const char*,
			const unsigned int);

/* Number of rows in entire CSV file */
int
easycsv_printrows(const easycsv*);

/* Number of columns in entire CSV file */
int
easycsv_printcolumns(const easycsv*);

/* INSERT VALUE -- AT SPECIFIC ROW AND COLUMN */

// int easycsv_insertrow(struct easycsv*, const char*, const int);

/* Insert string in a specific cell */
int
easycsv_insertvalue(easycsv*,
		    const char*,
		    const unsigned int,
		    const unsigned int);

/* Insert string in a specific cell with specific mode */
int
easycsv_insertvaluemode(easycsv*,
			const char*,
			const unsigned int,
			const unsigned int,
			const EASYCSV_VALMODE);

/* Insert string in a specific cell with named column in row 1 */
int
easycsv_insertcolumnvalue(easycsv*,
			  const char*,
			  const unsigned int,
			  const char*);

/* Insert string in a specific cell with named column in row 1 with specific mode */
int
easycsv_insertcolumnvaluemode(easycsv*,
			      const char*,
			      const unsigned int,
			      const char*,
			      const EASYCSV_VALMODE);

/* PUSH VALUE */

/* Create new column on the RHS of an existing one */
int
easycsv_pushcolumn(easycsv*,
		   const char*);

/* Insert string in a vacant cell under a named column */
int
easycsv_pushcolumnvalue(easycsv*,
			const char*,
			const char*);

/* DELETE VALUES -- use INSERT VALUE with empty string*/

/* Delete CSV value */
int
easycsv_deletevalue(easycsv*,
		    const unsigned int,
		    const unsigned int);

/* Delete numbered column */
int
easycsv_deletecolumnint(easycsv*,
			const unsigned int);

/* Delete named column */
int
easycsv_deletecolumnstr(easycsv*,
			const char*);

/* Delete numered row */

/* Delete named row */

#endif /* EASYCSV_H */