#ifndef UTILS_H
#define UTILS_H

#include <stddef.h>
#include <stdint.h>

#include "config.h"

typedef struct {
    char *data;
    size_t len;
    size_t cap;
} StrBuf;

void sb_init(StrBuf *sb);
void sb_free(StrBuf *sb);
int sb_reserve(StrBuf *sb, size_t extra);
int sb_append(StrBuf *sb, const char *s);
int sb_append_n(StrBuf *sb, const char *s, size_t n);
int sb_append_byte_hex(StrBuf *sb, uint8_t b);
char *sb_take(StrBuf *sb);

int hex_char_to_val(char c);
int hex_to_bytes(const char *hex, uint8_t **out, size_t *out_len);
char *bytes_to_hex(const uint8_t *data, size_t len);
int hex_to_fixed_bytes(const char *hex, uint8_t *out, size_t out_len);
void reverse_bytes(uint8_t *data, size_t n);

void double_sha256(const uint8_t *data, size_t len, uint8_t out[32]);
int encode_varint_hex(uint64_t value, StrBuf *sb);

char *decode_nbits_hex(uint32_t nbits);
char *calculate_target_hex(const char *bits_hex, double difficulty_factor, const char *network);

char *hex_add_width(const char *base_hex, int add_value);

#endif