/*  This file is part of FediBlock-backend.
 *  Copyright © 2020 tastytea <tastytea@tastytea.de>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, version 3.
 *
 *  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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "gitea.hpp"

#include "cgi.hpp"
#include "curl/curl.h"
#include "files.hpp"
#include "json.hpp"

#include <stdexcept>
#include <string>
#include <string_view>

namespace FediBlock::gitea
{

using std::runtime_error;
using std::string;
using std::string_view;
using std::to_string;

CURL *_connection;

void init()
{
    _connection = curl_easy_init();

    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    CURLcode code{curl_easy_setopt(_connection, CURLOPT_FOLLOWLOCATION, 1L)};
    if (code != CURLE_OK)
    {
        throw runtime_error{"HTTP is not supported."};
    }
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    curl_easy_setopt(_connection, CURLOPT_MAXREDIRS, 5L);

    // Add extra headers.
    struct curl_slist *headers{nullptr};
    string authheader{"Authorization: token " + files::get_access_token()};
    headers = curl_slist_append(headers, authheader.c_str());
    headers = curl_slist_append(headers, "Accept: application/json");
    headers = curl_slist_append(headers, "Content-Type: application/json");
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    code = curl_easy_setopt(_connection, CURLOPT_HTTPHEADER, headers);
    if (code != CURLE_OK)
    {
        throw runtime_error{"Could not add headers"};
    }

    // Write the body into the void.
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    curl_easy_setopt(_connection, CURLOPT_WRITEFUNCTION, noop_cb);
}

void cleanup()
{
    curl_easy_cleanup(gitea::_connection);
}

size_t noop_cb(void * /*ptr*/, size_t size, size_t nmemb, void * /*data*/)
{
    return size * nmemb;
}

void api_request(const string_view path, const string_view body)
{
    CURLcode code;
    const string url{string("https://schlomp.space") += path};

    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    code = curl_easy_setopt(_connection, CURLOPT_URL, url.c_str());
    if (code != CURLE_OK)
    {
        throw runtime_error{"Couldn't set URL"};
    }

    // Prepare body to send.
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    curl_easy_setopt(_connection, CURLOPT_POSTFIELDSIZE, body.size());
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    curl_easy_setopt(_connection, CURLOPT_POSTFIELDS, body.data());
    if (code != CURLE_OK)
    {
        throw runtime_error{"Couldn't set up data to send"};
    }

    code = curl_easy_perform(_connection);
    if (code != CURLE_OK)
    {
        throw runtime_error{"libcurl error: " + to_string(code)};
    }

    long http_status; // NOLINT(google-runtime-int)
    // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg)
    curl_easy_getinfo(_connection, CURLINFO_RESPONSE_CODE, &http_status);
    if (http_status != 201) // 201 == Created.
    {
        throw runtime_error{"HTTP error: " + to_string(http_status)};
    }
}

void pull_request(const string_view branch, const cgi::entry_type &entry)
{
    api_request("/api/v1/repos/FediBlock/data/pulls",
                json::pull_request_body(branch, entry));
}

} // namespace FediBlock::gitea