#ifndef HELLO_H
#define HELLO_H

#include <stdbool.h>
#include <stdint.h>
#include "buffer.h"

static const uint8_t METHOD_NO_AUTHENTICATION_REQUIRED = 0x00;
static const uint8_t METHOD_USERNAME_PASSWORD_AUTHENTICATION = 0x02;
static const uint8_t METHOD_NO_ACCEPTABLE_METHODS = 0xFF;

enum hello_state {
    hello_version,
    hello_nmethods,
    hello_methods,
    hello_done,
    hello_error_unsupported_version,
};

struct hello_parser {
    void (* on_authentication_method) (struct hello_parser * parser, const uint8_t method);
    void * data;
    enum hello_state state;
    uint8_t remaining;
    uint8_t has_selected;
};

void hello_parser_init(struct hello_parser *p);

enum hello_state hello_parser_feed(struct hello_parser * p, uint8_t b);

enum hello_state hello_consume(buffer * b, struct hello_parser * p, bool * errored);

bool hello_is_done(enum hello_state state, bool * errored);

extern const char * hello_error(const struct hello_parser *p);

void hello_parser_close(struct hello_parser *p);

extern int hello_marshall(buffer * b, uint8_t method);

#endif