/* parc
 * Copyright (C) 2025 Ekaitz Zarraga <ekaitz@elenq.tech>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef PIECE_TABLE_INTERNALS_H
#define PIECE_TABLE_INTERNALS_H

typedef struct
  {
    size_t used;
    size_t size;
    char *contents;
  }
text_buffer;

typedef struct _piece
  {
    text_buffer *buffer;
    size_t start;
    size_t length;
    struct _piece *next;
    struct _piece *prev;
  }
piece;

typedef struct _piece_buffer
  {
    size_t used;
    size_t size;
    struct _piece_buffer *next;
    piece *start;
  }
piece_buffer;

typedef struct _piece_table
  {
    text_buffer orig;
    text_buffer add;
    piece_buffer *pieces;
    piece *sentinel;
    piece *empty;
    size_t length;

    piece *cached;
    size_t cached_offset;
  }
piece_table;



/* text_buffer */
void text_buffer_init (text_buffer *tb);
void text_buffer_resize (text_buffer *tb, size_t size);
void text_buffer_append (text_buffer *tb, char c);
char text_buffer_index (text_buffer *tb, size_t pos);
void text_buffer_empty (text_buffer *tb);
void text_buffer_fill (text_buffer *tb, char *fill, size_t size);
void text_buffer_free (text_buffer *tb);

/* piece_buffer */
piece_buffer *piece_buffer_create (size_t size);
void piece_buffer_destroy (piece_buffer *pb);
void piece_buffer_empty (piece_buffer *pb);
piece *piece_buffer_bump (piece_buffer *pb);

/* piece_table */
void piece_table_piece_mark_empty (piece_table *pt, piece *p);
piece *piece_table_piece_new (piece_table *pt);
piece *piece_table_piece_split (piece_table *pt, piece *p, size_t pos);
void piece_table_piece_find (piece_table *pt, size_t pos);
void piece_table_insert (piece_table *pt, size_t pos, char *in, size_t len);
void piece_table_delete (piece_table *pt, size_t pos, size_t len);
piece_table *piece_table_create_from_str (char *orig, size_t size);
piece_table *piece_table_create (char *orig, size_t size);
void piece_table_destroy (piece_table *pt);
char piece_table_index (piece_table *pt, size_t pos);
void piece_table_to_string (piece_table *pt, char *buf, size_t size);
size_t piece_table_length (piece_table *pt);
void piece_table_optimize (piece_table *pt);

#endif /* PIECE_TABLE_INTERNALS_H */