/*  This file is part of FediPotato.
 *  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/>.
 */

#ifndef FEDIPOTATO_ACCOUNT_MASTODON_HPP
#define FEDIPOTATO_ACCOUNT_MASTODON_HPP

#include "config.hpp"

#include <boost/thread/thread.hpp>
#include <mastodonpp/mastodonpp.hpp>

#include <map>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <thread>

namespace FediPotato
{

using std::map;
using std::unique_ptr;
using std::optional;
using std::string;
using std::string_view;
using std::thread;

/*!
 *  @brief  Interact with an account using the Mastodon API.
 *
 *  @throw  std::runtime_error                No hashtag or list ID given.
 *  @throw  std::logic_error        Unhandled stream type. (Should never happen)
 *  @throw  std::runtime_error                Directory not found.
 *  @throw  std::filesystem::filesystem_error Could not create directory.
 *  @throw  std::ifstream::failure            Could not read from file.
 *  @throw  nlohmann::detail::parse_error     Could not parse file.
 *  @throw  nlohmann::detail::type_error      Setting not found / Wrong type.
 *  @throw  mastodonpp::CURLException         libcurl error from
 *  [mastodonpp](https://doc.schlomp.space/mastodonpp/).
 *
 *  @since  0.1.0
 *
 *  @headerfile account_mastodon.hpp FediPotato/account_mastodon.hpp
 */
class MastodonAPI
{
public:
    /*!
     *  @brief  The type of stream.
     *
     *  @since  0.1.0
     */
    enum class stream_type
    {
        home_tl,
        instance_tl,
        federated_tl,
        conversations,
        hashtag,
        list
    };

public:
    /*!
     *  @brief  Construct a MastodonAPI object.
     *
     *  For possible exceptions see Directories and Config.
     *
     *  @throw  std::runtime_error                Directory not found.
     *  @throw  std::filesystem::filesystem_error Could not create directory.
     *  @throw  std::ifstream::failure            Could not read from file.
     *  @throw  nlohmann::detail::parse_error     Could not parse file.
     *  @throw  nlohmann::detail::type_error     Setting not found / Wrong type.
     *  @throw  mastodonpp::CURLException         libcurl error from
     *  [mastodonpp](https://doc.schlomp.space/mastodonpp/).
     *
     *  @since  0.1.0
     */
    MastodonAPI(string_view application_name, string_view account_name,
                const Config &globalconfig);

    //! Copy constructor
    MastodonAPI(const MastodonAPI &other) = delete;

    //! Move constructor
    MastodonAPI(MastodonAPI &&other) noexcept = delete;

    //! Destructor
    virtual ~MastodonAPI() noexcept = default;

    //! Copy assignment operator
    MastodonAPI& operator=(const MastodonAPI &other) = delete;

    //! Move assignment operator
    MastodonAPI& operator=(MastodonAPI &&other) noexcept = delete;

public:
    /*!
     *  @brief  Start streaming a timeline, conversations, hashtag or list.
     *
     *  @param  type What to stream.
     *  @param  id   The hashtag or list id.
     *
     *  @throw  std::runtime_error        hashtag or list ID given.
     *  @throw  std::logic_error    Unhandled stream type. (Should never happen)
     *  @throw  mastodonpp::CURLException libcurl error from [mastodonpp]
     *  (https://doc.schlomp.space/mastodonpp/).
     *
     *  @since  0.1.0
     */
    void start_stream(stream_type type, optional<string_view> id);

    /*!
     *  @brief  Stop streaming a timeline, conversations, hashtag or list.
     *
     *  @param  type What to stream.
     *  @param  id   The hashtag or list id.
     *
     *  @throw  std::runtime_error No hashtag or list ID given.
     *  @throw  std::logic_error   Unhandled stream type. (Should never happen)
     *
     *  @since  0.1.0
     */
    void stop_stream(stream_type type, optional<string_view> id);

private:
    Config _config;
    mastodonpp::Instance _instance;
    map<string,unique_ptr<boost::thread>> _streams;

private:
    static string get_stream_id(stream_type type, optional<string_view> id);

    static void make_stream_thread(mastodonpp::Instance &instance,
                                   stream_type type, optional<string_view> id);
};

} // namespace FediPotato

#endif  // FEDIPOTATO_ACCOUNT_MASTODON_HPP