model.h

#ifndef BUFFER_H
#define BUFFER_H

#include <stddef.h>
#include <sched.h>

#define INITIAL_LINES_CAPACITY 10

// Gap buffer for efficient text editing
typedef struct {
    char* buffer;
    int buffer_size;
    int gap_start;
    int gap_end;
    int text_len;
} GapBuffer;

// Cache for nesting levels (syntax highlighting state per line)
typedef struct {
    int valid;          // Is this cache entry valid?
    int brace_level;
    int brace_top;
    int brace_stack[256];
    int kw_level;
    int kw_top;
    int kw_stack[100];
} NestingCache;

typedef struct {
    GapBuffer** lines;
    int num_lines;
    int capacity;
    NestingCache* nesting_cache;  // Cache of nesting levels per line
} Buffer;

// GapBuffer operations
GapBuffer* gap_buffer_create();
void gap_buffer_free(GapBuffer* gb);
void gap_buffer_insert(GapBuffer* gb, int pos, char c);
void gap_buffer_delete(GapBuffer* gb, int pos);
char gap_buffer_get_char(const GapBuffer* gb, int pos);
const char* gap_buffer_get_text(const GapBuffer* gb);
int gap_buffer_length(const GapBuffer* gb);
void gap_buffer_move_gap(GapBuffer* gb, int pos);

void buffer_init(Buffer* buf);
void buffer_free(Buffer* buf);
int buffer_load_from_file(Buffer* buf, const char* filename);
int buffer_save_to_file(const Buffer* buf, const char* filename);
char* buffer_get_line(const Buffer* buf, int line); // caller must free
int buffer_get_line_length(const Buffer* buf, int line);
int buffer_num_lines(const Buffer* buf);
char buffer_get_char(const Buffer* buf, int line, int col);
int buffer_insert_line(Buffer* buf, int line, const char* content);
int buffer_delete_line(Buffer* buf, int line);
int buffer_insert_char(Buffer* buf, int line, int col, char c);
int buffer_delete_char(Buffer* buf, int line, int col);
int buffer_delete_range(Buffer* buf, int start_line, int start_col, int end_line, int end_col);
int buffer_insert_text(Buffer* buf, int line, int col, const char* text);
void buffer_replace_all(Buffer* buf, const char* search_regex, const char* replace_str);

#endif