/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * This program 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef MASTODONT_FETCH_H
#define MASTODONT_FETCH_H
#include <cjson/cJSON.h>
#include <mastodont_types.h>
#include <curl/curl.h>

/** Used to store the response from CURL */
struct mstdnt_fetch_data
{
    char* response;
    size_t size;

    struct mstdnt_storage storage;

    // Callback from user
    mstdnt_request_cb_t callback;
    void* callback_args;
    int (*json_cb)(cJSON*, void*);
    void* json_args;
};

struct mstdnt_fd
{
    int fd;
    short events;
    short revents;
};

/* Note: Don't quite rely on these values being equal to curl's! */
enum mstdnt_fds_events
{
    MSTDNT_POLLIN = CURL_WAIT_POLLIN,
    MSTDNT_POLLPRI = CURL_WAIT_POLLPRI,
    MSTDNT_POLLOUT = CURL_WAIT_POLLOUT,
};

enum mstdnt_fetch_await
{
    MSTDNT_AWAIT_ALL,
    MSTDNT_AWAIT_ONCE,
};

size_t mstdnt_curl_write_callback(char* ptr, size_t _size, size_t nmemb, void* _content);
void mstdnt_fetch_data_cleanup(struct mstdnt_fetch_data* res);

/**
 * @brief Attempts to fetch, async or blocking.
 *
 * @param mstdnt Mastodont struct
 * @param curl curl API
 * @param args Mastodont General args passed
 * @param url URL of request
 * @param results Results from response
 * @return Number of connections in progress, or -1 on error
 */
int mstdnt_fetch_curl_async(mastodont_t* mstdnt,
                            CURL* curl,
                            struct mstdnt_args* args,
                            mstdnt_request_cb_t cb_request,
                            void* cb_args,
                            int (*json_cb)(cJSON*, void*),
                            void* json_args,
                            char* url,
                            CURLoption request_t,
                            char* request_t_custom);

/**
 * @brief Blocks until a transfer is complete.
 *
 * You can also check curl's socket 
 *
 * @param mstdnt Mastodont struct
 * @param opt Option, MSTDNT_AWAIT_ALL means it will keep going until
 *  there are no more transfers. MSTDNT_AWAIT_ONCE will run
 * @param extra_fds Set of file descriptors to poll alongside
 *  the mastodont data.
 * @param nfds Length of extra_fds
 * @return 1 on error
 */
int mstdnt_await(mastodont_t* mstdnt,
                 enum mstdnt_fetch_await opt,
                 struct mstdnt_fd extra_fds[],
                 size_t nfds);

#endif /* MASTODONT_FETCH_H */