/*
 * Copyright (C) 2022 Mikhail Burakov. This file is part of toolbox.
 *
 * toolbox 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.
 *
 * toolbox 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 toolbox.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef TOOLBOX_HTTP_PARSER_H_
#define TOOLBOX_HTTP_PARSER_H_

#include <stdbool.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus

enum HttpParserResult {
  kHttpParserResultFinished = 0,
  kHttpParserResultWantMore,
  kHttpParserResultError,
};

struct HttpParserCallbacks {
  void (*on_request)(void* user, const char* method, size_t method_size,
                     const char* target, size_t target_size);
  void (*on_field)(void* user, const char* name, size_t name_size,
                   const char* value, size_t value_size);
  void (*on_finished)(void* user, size_t offset);
};

struct HttpParserState;

typedef enum HttpParserResult (*HttpParserHandler)(
    struct HttpParserState*, const void*, size_t,
    const struct HttpParserCallbacks*, void*);

struct HttpParserState {
  HttpParserHandler stage;
  bool maybe_eol;
  size_t parsing_offset;
  size_t first_offset;
  size_t first_size;
  size_t second_offset;
  size_t second_size;
};

void HttpParserReset(struct HttpParserState* state);
enum HttpParserResult HttpParserParse(
    struct HttpParserState* state, const void* buffer, size_t buffer_size,
    const struct HttpParserCallbacks* callbacks, void* user);

#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus

#endif  // TOOLBOX_HTTP_PARSER_H_