#ifndef TEXTBUFFER_H
#define TEXTBUFFER_H

#include <stdbool.h>

typedef struct textbuffer *TB;

typedef struct _matchNode {
      int lineNumber;
      int columnNumber;
      struct _matchNode* next;
} matchNode;

typedef matchNode *Match;

/* Allocate a new textbuffer whose contents is initialised with the text given
 * in the array.
 */
TB newTB (char text[]);

/* Free the memory occupied by the given textbuffer.  It is an error to access
 * the buffer afterwards.
 */
void releaseTB (TB tb);

/* Allocate and return an array containing the text in the given textbuffer.
 * add a prefix corrosponding to line number iff showLineNumbers == TRUE
 */
char *dumpTB (TB tb, bool showLineNumbers);

/* Return the number of lines of the given textbuffer.
 */
int linesTB (TB tb);

/* Add a given prefix to all lines between pos1 and pos2
 *
 * - The program is to abort() with an error message if line 'pos1' or line
 *   'pos2' is out of range.  The first line of a textbuffer is at position 0.
 */
void addPrefixTB (TB tb, int pos1, int pos2, char* prefix);

/* Merge 'tb2' into 'tb1' at line 'pos'.
 *
 * - Afterwards line 0 of 'tb2' will be line 'pos' of 'tb1'.
 * - The old line 'pos' of 'tb1' will follow after the last line of 'tb2'.
 * - After this operation 'tb2' can not be used anymore (as if we had used
 *   releaseTB() on it).
 * - The program is to abort() with an error message if 'pos' is out of range.
 */
void mergeTB (TB tb1, int pos, TB tb2);

/* Copy 'tb2' into 'tb1' at line 'pos'.
 *
 * - Afterwards line 0 of 'tb2' will be line 'pos' of 'tb1'.
 * - The old line 'pos' of 'tb1' will follow after the last line of 'tb2'.
 * - After this operation 'tb2' is unmodified and remains usable independent
 *   of 'tb1'.
 * - The program is to abort() with an error message if 'pos' is out of range.
 */
void pasteTB (TB tb1, int pos, TB tb2);

/* Cut the lines between and including 'from' and 'to' out of the textbuffer
 * 'tb'.
 *
 * - The result is a new textbuffer (much as one created with newTB()).
 * - The cut lines will be deleted from 'tb'.
 * - The program is to abort() with an error message if 'from' or 'to' is out
 *   of range.
 */
TB cutTB (TB tb, int from, int to);

/*  Return a linked list of Match nodes of all the matches of string search
 *  in tb
 *
 * - The textbuffer 'tb' will remain unmodified.
 * - The user is responsible of freeing the returned list
 */
Match searchTB (TB tb, char* search);

/* Remove the lines between and including 'from' and 'to' from the textbuffer
 * 'tb'.
 *
 * - The program is to abort() with an error message if 'from' or 'to' is out
 *   of range.
 */
void deleteTB (TB tb, int from, int to);


/* Search every line of tb for each occurrence of a set of specified subsitituions
 * and alter them accordingly
 *
 * refer to spec for table.
 */
void formRichText (TB tb);


/* Your whitebox tests
 */
void whiteBoxTests();

/* Bonus Challenges
 */

char* diffTB (TB tb1, TB tb2) ;

void undoTB (TB tb) ;

void redoTB (TB tb) ;

#endif