#ifndef _HTTP_H
#define _HTTP_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include <stddef.h>

#include "session.h"

/******************************************************************************
 * Public API: For build in
 ******************************************************************************/

void http_entry(struct stellar_session *session, enum session_state state, int thread_id, void **ctx);

/******************************************************************************
 * Public API: For http consumer
 ******************************************************************************/

enum http_event
{
    HTTP_EVENT_NONE = 0x0,

    HTTP_EVENT_REQ_LINE = 0x01,
    HTTP_EVENT_REQ_HDR = 0x02,
    HTTP_EVENT_REQ_BODY = 0x04,

    HTTP_EVENT_RESP_LINE = 0x08,
    HTTP_EVENT_RESP_HDR = 0x10,
    HTTP_EVENT_RESP_BODY = 0x20,
};

struct http_request_line
{
    char *method;
    size_t method_len;

    char *uri;
    size_t uri_len;

    int major_version;
    int minor_version;
};

struct http_status_line
{
    char *status;
    size_t status_len;

    int status_code;

    int major_version;
    int minor_version;
};

struct http_decoder *http_session_get_decoder(struct stellar_session *http_session);
enum http_event http_decoder_get_event(struct http_decoder *decoder);

/*
 * The data fetched by the http_decoder_fetch_xxx() API
 * is only available during the lifetime of the current packet.
 */
void http_decoder_fetch_request_line(struct http_decoder *decoder, struct http_request_line *request_line);
void http_decoder_fetch_status_line(struct http_decoder *decoder, struct http_status_line *status_line);

void http_decoder_fetch_body(struct http_decoder *decoder, char **ptr, size_t *len);
void http_decoder_fetch_next_header(struct http_decoder *decoder, int *iter_index, char **filed_ptr, size_t *filed_len, char **value_ptr, size_t *value_len);

/******************************************************************************
 * Example: How to implement http consumer
 ******************************************************************************/
/*
void http_consumer_entry_example(struct stellar_session *http_session, enum session_event_type event, const char *payload, size_t len, void **ctx)
{
    if (event & SESSION_EVENT_OPENING)
    {
        // malloc ctx
    }

    if (event & SESSION_EVENT_META)
    {
        struct http_decoder *decoder = http_decoder_get(http_session);
        enum http_event ready_event = http_decoder_ready_event(decoder);

        if (ready_event & HTTP_EVENT_REQ_LINE)
        {
            struct http_request_line request_line;
            http_decoder_fetch_request_line(decoder, &request_line);
        }

        if (ready_event & HTTP_EVENT_RESP_LINE)
        {
            struct http_status_line status_line;
            http_decoder_fetch_status_line(decoder, &status_line);
        }

        if (ready_event & HTTP_EVENT_REQ_HDR)
        {
            int iter_index = 0;
            char *filed_ptr = NULL;
            char *value_ptr = NULL;

            size_t filed_len = 0;
            size_t value_len = 0;

            do
            {
                http_decoder_fetch_next_header(decoder, iter_index, &filed_ptr, &filed_len, &value_ptr, &value_len);
                if (filed_ptr)
                {
                    if (strcmp("Host", filed_ptr, filed_len) == 0)
                    {
                        // get Host value : value_ptr
                    }

                    // ....

                    if (strcmp("User-Agent", filed_ptr, filed_len) == 0)
                    {
                        // get User-Agen value : value_ptr
                    }
                }
            } while (filed_ptr);
        }

        if (ready_event & HTTP_EVENT_RESP_HDR)
        {
            int iter_index = 0;
            char *filed_ptr = NULL;
            char *value_ptr = NULL;

            size_t filed_len = 0;
            size_t value_len = 0;

            do
            {
                http_decoder_fetch_next_header(decoder, iter_index, &filed_ptr, &filed_len, &value_ptr, &value_len);
                if (filed_ptr)
                {
                    if (strcmp("Server", filed_ptr, filed_len) == 0)
                    {
                        // get Server value : value_ptr
                    }

                    // ....

                    if (strcmp("content-length", filed_ptr, filed_len) == 0)
                    {
                        // get content-length value : value_ptr
                    }
                }
            } while (filed_ptr);
        }

        if (ready_event & HTTP_EVENT_REQ_BODY)
        {
            char *req_body_ptr = NULL;
            size_t req_body_len = 0;
            http_decoder_fetch_body(decoder, req_body_ptr, req_body_len);
        }

        if (ready_event & HTTP_EVENT_RESP_BODY)
        {
            char *resp_body_ptr = NULL;
            size_t resp_body_len = 0;
            http_decoder_fetch_body(decoder, resp_body_ptr, resp_body_len);
        }
    }

    if (event & SESSION_EVENT_CLOSING)
    {
        // free ctx
    }
}
*/

#ifdef __cpluscplus
}
#endif

#endif