#ifndef HTTP_H
#define HTTP_H

// === Definitions

// #define _POSIX_C_SOURCE 200809L

// Error codes
#define ERR_HTTP_INVALID_INPUT -1
#define ERR_HTTP_NOT_IMPLEMENTED -2
#define ERR_HTTP_OUT_OF_MEMORY -4
#define ERR_HTTP_INTERNAL_ERROR -5

// === Includes

#include "../config/config.h"
#include "../utils/string/string.h"

// === Enums

enum http_method
{
    INVALID_METHOD,
    GET,
    // POST,
    // PUT,
    // DELETE,
    // PATCH,
    HEAD,
    // OPTIONS,
    // CONNECT,
    // TRACE
};

// === Structures

struct http_header
{
    struct string *field;
    struct string *value;
    struct http_header *next;
};

struct http_request
{
    enum http_method method;
    struct string *target;
    struct string *queries;
    struct string *protocol;
    struct http_header *headers; // Headers linked list
    int status_code; // Set by program
};

struct http_response
{
    struct string *protocol;
    int status_code;
    struct string *status_msg;
    struct http_header *headers; // Headers linked list
};

// === Functions

/* @brief Initializes the HTTP module with the given configuration
 *
 * @warn Do no use any other function of this module before calling that one
 *
 * @param cfg
 */
void http_init(struct config *cfg);

/* @brief Reads, parses the request and responds adequately all-in-one
 *
 * @param client_fd
 */
void handle_request(int client_fd, char *client_ip);

/* @brief Parses the HTTP request and splits it into a request structure
 *
 * @param req
 *
 * @return A pointer to the structure containing the request infos on success,
 *         NULL otherwise
 */
struct http_request *parse_request(struct string *req);

/* @brief Generates a response to the given request
 *
 * @param req
 *
 * @return A pointer to the generated response struct on success,
 *         NULL otherwise
 */
struct http_response *generate_response(struct http_request *req);

/* @brief Formats the given response structure into a valid HTTP response
 *        string
 *
 * @param resp
 *
 * @return A pointer to the string containing the response on success,
 *         NULL otherwise
 */
struct string *format_response(struct http_response *resp);

/* @brief Free all allocated memory inside req and req itself
 *
 * @param req
 */
void destroy_request(struct http_request *req);

/* @brief Free all allocated memory inside resp and resp itself
 *
 * @param resp
 */
void destroy_response(struct http_response *resp);

#endif // ! HTTP_H