#ifndef TXT_H
#define TXT_H

#include "dynarr.h"

typedef enum : u8 {
	TXT_SRC,
	TXT_ADD
} TxtBufIdx;

typedef struct TxtPiece {
	TxtBufIdx buf;
	u32 ofs, n;
} TxtPiece;

typedef struct {
	char *s;
	u32 n, c;
} TxtBuf;

typedef struct {
	u32 p, i;
} TxtLoc;

typedef struct {
	DYNARR(TxtPiece) ptbl;
	TxtBuf buf[2];
	u32 len;
} Txt;

u32 txt_split_piece(Txt *b, u32 pi, u32 i);
void txt_remove_piece(Txt *b, u32 pi);
void txt_insert_piece(Txt *b, u32 pi, TxtBufIdx buf, u32 ofs, u32 n);

u32 txt_insert(Txt *b, u32 cur, const char *s, u32 n);
u32 txt_delete(Txt *b, u32 cur, u32 n);
u32 txt_insert_c(Txt *b, u32 cur, u32 ch);
u32 txt_delete_c(Txt *b, u32 cur);
int txt_load(Txt *b, const char *path);
int txt_save(Txt *b, const char *path);
void txt_free(Txt *b);

TxtLoc txt_at(Txt *b, u32 cur);
u32 txt_ofs(Txt *b, TxtLoc l);
TxtLoc txt_next(Txt *b, TxtLoc l);
TxtLoc txt_prev(Txt *b, TxtLoc l);
int txt_at_start(Txt *b, TxtLoc l);
int txt_at_end(Txt *b, TxtLoc l);

u32 txt_chr(Txt *b, TxtLoc l);
u8 txt_byte(Txt *b, TxtLoc l);

#endif