lobby.cpp

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/*
   Copyright (C) 2009 - 2018 by Tomasz Sniatowski <kailoran@gmail.com>
   Part of the Battle for Wesnoth Project https://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 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.

   See the COPYING file for more details.
*/
#define GETTEXT_DOMAIN "wesnoth-lib"

#include "gui/dialogs/multiplayer/lobby.hpp"

#include "gui/auxiliary/find_widget.hpp"
#include "gui/dialogs/message.hpp"
#include "gui/dialogs/multiplayer/mp_join_game_password_prompt.hpp"
#include "gui/dialogs/multiplayer/player_info.hpp"
#include "gui/dialogs/preferences_dialog.hpp"

#include "gui/core/log.hpp"
#include "gui/core/timer.hpp"
#include "gui/widgets/button.hpp"
#include "gui/widgets/image.hpp"
#include "gui/widgets/label.hpp"
#include "gui/widgets/listbox.hpp"
#include "gui/widgets/menu_button.hpp"
#include "gui/widgets/minimap.hpp"
#include "gui/widgets/chatbox.hpp"
#include "gui/widgets/settings.hpp"
#include "gui/widgets/text_box.hpp"
#include "gui/widgets/toggle_button.hpp"
#include "gui/widgets/toggle_panel.hpp"
#include "gui/widgets/tree_view_node.hpp"

#include "addon/manager_ui.hpp"
#include "chat_log.hpp"
#include "font/text_formatting.hpp"
#include "formatter.hpp"
#include "formula/string_utils.hpp"
#include "preferences/game.hpp"
#include "gettext.hpp"
#include "preferences/lobby.hpp"
#include "playmp_controller.hpp"
#include "wesnothd_connection.hpp"

#include "utils/functional.hpp"

static lg::log_domain log_lobby("lobby");
#define DBG_LB LOG_STREAM(debug, log_lobby)
#define LOG_LB LOG_STREAM(info, log_lobby)
#define ERR_LB LOG_STREAM(err, log_lobby)
#define SCOPE_LB log_scope2(log_lobby, __func__)

namespace gui2
{
namespace dialogs
{

REGISTER_DIALOG(mp_lobby)

void sub_player_list::init(window& w, const std::string& lbl, const bool unfolded)
{
    tree_view& parent_tree = find_widget<tree_view>(&w, "player_tree", false);

    std::map<std::string, string_map> tree_group_item;
    tree_group_item["tree_view_node_label"]["label"] = lbl;

    tree = &parent_tree.add_node("player_group", tree_group_item);

    if(unfolded) {
        tree->unfold();
    }

    tree_label = find_widget<label>(tree, "tree_view_node_label", false, true);
    label_player_count = find_widget<label>(tree, "player_count", false, true);

    assert(tree_label);
    assert(label_player_count);
}

void sub_player_list::update_player_count_label()
{
    assert(tree);
    assert(label_player_count);

    /**
     * @todo Make sure setting visible resizes the widget.
     *
     * It doesn't work here since invalidate_layout is blocked, but the
     * widget should also be able to handle it itself. Once done the
     * setting of the label text can also be removed.
     */
    label_player_count->set_label((formatter() << "(" << tree->count_children() << ")").str());
}

void player_list::init(window& w)
{
    active_game.init(w, _("Selected Game"), true);
    other_rooms.init(w, _("Lobby"), true);
#ifdef ENABLE_ROOM_MEMBER_TREE
    active_room.init(w, _("Current Room"));
#endif
    other_games.init(w, _("Other Games"));

    tree = find_widget<tree_view>(&w, "player_tree", false, true);
}

bool mp_lobby::logout_prompt()
{
    return show_prompt(_("Do you really want to log out?"));
}

mp_lobby::mp_lobby(const config& game_config, mp::lobby_info& info, wesnothd_connection &connection)
    : quit_confirmation(&mp_lobby::logout_prompt)
    , game_config_(game_config)
    , gamelistbox_(nullptr)
    , lobby_info_(info)
    , chatbox_(nullptr)
    , filter_friends_(nullptr)
    , filter_ignored_(nullptr)
    , filter_slots_(nullptr)
    , filter_invert_(nullptr)
    , filter_text_(nullptr)
    , selected_game_id_()
    , player_list_()
    , player_list_dirty_(true)
    , gamelist_dirty_(true)
    , last_lobby_update_(0)
    , gamelist_diff_update_(true)
    , network_connection_(connection)
    , lobby_update_timer_(0)
    , gamelist_id_at_row_()
    , delay_playerlist_update_(false)
    , delay_gamelist_update_(false)
    , joined_game_id_(0)
{
    // Need to set this in the constructor, pre_show() is too late
    set_show_even_without_video(true);
    set_allow_plugin_skip(false);
}

struct lobby_delay_gamelist_update_guard
{
    lobby_delay_gamelist_update_guard(mp_lobby& l) : l(l)
    {
        l.delay_gamelist_update_ = true;
    }
    ~lobby_delay_gamelist_update_guard()
    {
        l.delay_gamelist_update_ = false;
    }
    mp_lobby& l;
};

mp_lobby::~mp_lobby()
{
    if(lobby_update_timer_) {
        remove_timer(lobby_update_timer_);
    }
}

void mp_lobby::post_build(window& win)
{
    /*** Local hotkeys. ***/
    win.register_hotkey(hotkey::HOTKEY_PREFERENCES,
        std::bind(&mp_lobby::show_preferences_button_callback, this, std::ref(win)));
}

namespace
{
void modify_grid_with_data(grid* grid, const std::map<std::string, string_map>& map)
{
    for(const auto& v : map) {
        const std::string& key = v.first;
        const string_map& strmap = v.second;

        widget* w = grid->find(key, false);
        if(!w) {
            continue;
        }

        styled_widget* c = dynamic_cast<styled_widget*>(w);
        if(!c) {
            continue;
        }

        for(const auto & vv : strmap) {
            if(vv.first == "label") {
                c->set_label(vv.second);
            } else if(vv.first == "tooltip") {
                c->set_tooltip(vv.second);
            }
        }
    }
}

std::string colorize(const std::string& str, const color_t& color)
{
    return (formatter() << font::span_color(color) << str << "</span>").str();
}

bool handle_addon_requirements_gui(const std::vector<mp::game_info::required_addon>& reqs, mp::game_info::ADDON_REQ addon_outcome)
{
    if(addon_outcome == mp::game_info::CANNOT_SATISFY) {
        std::string e_title = _("Incompatible User-made Content.");
        std::string err_msg = _("This game cannot be joined because the host has out-of-date add-ons that are incompatible with your version. You might wish to suggest that the host's add-ons be updated.");

        err_msg +="\n\n";
        err_msg += _("Details:");
        err_msg += "\n";

        for(const mp::game_info::required_addon & a : reqs) {
            if (a.outcome == mp::game_info::CANNOT_SATISFY) {
                err_msg += font::unicode_bullet + " " + a.message + "\n";
            }
        }
        gui2::show_message(e_title, err_msg, message::auto_close, true);

        return false;
    } else if(addon_outcome == mp::game_info::NEED_DOWNLOAD) {
        std::string e_title = _("Missing User-made Content.");
        std::string err_msg = _("This game requires one or more user-made addons to be installed or updated in order to join.\nDo you want to try to install them?");

        err_msg +="\n\n";
        err_msg += _("Details:");
        err_msg += "\n";

        std::vector<std::string> needs_download;
        for(const mp::game_info::required_addon & a : reqs) {
            if(a.outcome == mp::game_info::NEED_DOWNLOAD) {
                err_msg += font::unicode_bullet + " " + a.message + "\n";

                needs_download.push_back(a.addon_id);
            }
        }

        assert(needs_download.size() > 0);

        if(gui2::show_message(e_title, err_msg, message::yes_no_buttons, true) == gui2::retval::OK) {
            // Begin download session
            return ad_hoc_addon_fetch_session(needs_download);
        }
    }

    return false;
}

} // end anonymous namespace

void mp_lobby::update_gamelist()
{
    SCOPE_LB;
    gamelistbox_->clear();
    gamelist_id_at_row_.clear();
    lobby_info_.make_games_vector();

    int select_row = -1;
    for(unsigned i = 0; i < lobby_info_.games().size(); ++i) {
        const mp::game_info& game = *lobby_info_.games()[i];

        if(game.id == selected_game_id_) {
            select_row = i;
        }

        gamelist_id_at_row_.push_back(game.id);
        LOG_LB << "Adding game to listbox (1)" << game.id << "\n";
        grid* grid = &gamelistbox_->add_row(make_game_row_data(game));

        adjust_game_row_contents(game, grid);
    }

    if(select_row >= 0 && select_row != gamelistbox_->get_selected_row()) {
        gamelistbox_->select_row(select_row);
    }

    update_selected_game();
    gamelist_dirty_ = false;
    last_lobby_update_ = SDL_GetTicks();
    lobby_info_.sync_games_display_status();
    lobby_info_.apply_game_filter();
    update_gamelist_header();
    gamelistbox_->set_row_shown(lobby_info_.games_visibility());
}

void mp_lobby::update_gamelist_diff()
{
    SCOPE_LB;
    lobby_info_.make_games_vector();
    int select_row = -1;
    unsigned list_i = 0;
    int list_rows_deleted = 0;

    std::vector<int> next_gamelist_id_at_row;
    for(unsigned i = 0; i < lobby_info_.games().size(); ++i) {
        const mp::game_info& game = *lobby_info_.games()[i];

        if(game.display_status == mp::game_info::NEW) {
            LOG_LB << "Adding game to listbox " << game.id << "\n";

            if(list_i != gamelistbox_->get_item_count()) {
                gamelistbox_->add_row(make_game_row_data(game), list_i);
                DBG_LB << "Added a game listbox row not at the end" << list_i
                       << " " << gamelistbox_->get_item_count() << "\n";
                list_rows_deleted--;
            } else {
                gamelistbox_->add_row(make_game_row_data(game));
            }

            grid* grid = gamelistbox_->get_row_grid(gamelistbox_->get_item_count() - 1);
            adjust_game_row_contents(game, grid);

            list_i++;
            next_gamelist_id_at_row.push_back(game.id);
        } else {
            if(list_i >= gamelistbox_->get_item_count()) {
                ERR_LB << "Ran out of listbox items -- triggering a full refresh\n";
                refresh_lobby();
                return;
            }

            if(list_i + list_rows_deleted >= gamelist_id_at_row_.size()) {
                ERR_LB << "gamelist_id_at_row_ overflow! " << list_i << " + "
                       << list_rows_deleted
                       << " >= " << gamelist_id_at_row_.size()
                       << " -- triggering a full refresh\n";
                refresh_lobby();
                return;
            }

            int listbox_game_id = gamelist_id_at_row_[list_i + list_rows_deleted];
            if(game.id != listbox_game_id) {
                ERR_LB << "Listbox game id does not match expected id "
                       << listbox_game_id << " " << game.id << " (row " << list_i << ")\n";
                refresh_lobby();
                return;
            }

            if(game.display_status == mp::game_info::UPDATED) {
                LOG_LB << "Modifying game in listbox " << game.id << " (row " << list_i << ")\n";
                grid* grid = gamelistbox_->get_row_grid(list_i);
                modify_grid_with_data(grid, make_game_row_data(game));
                adjust_game_row_contents(game, grid, false);
                ++list_i;
                next_gamelist_id_at_row.push_back(game.id);
            } else if(game.display_status == mp::game_info::DELETED) {
                LOG_LB << "Deleting game from listbox " << game.id << " (row "
                       << list_i << ")\n";
                gamelistbox_->remove_row(list_i);
                ++list_rows_deleted;
            } else {
                // clean
                LOG_LB << "Clean game in listbox " << game.id << " (row " << list_i << ")\n";
                next_gamelist_id_at_row.push_back(game.id);
                ++list_i;
            }
        }
    }

    for(unsigned i = 0; i < next_gamelist_id_at_row.size(); ++i) {
        if(next_gamelist_id_at_row[i] == selected_game_id_) {
            select_row = i;
        }
    }

    next_gamelist_id_at_row.swap(gamelist_id_at_row_);
    if(select_row >= static_cast<int>(gamelistbox_->get_item_count())) {
        ERR_LB << "Would select a row beyond the listbox" << select_row << " "
               << gamelistbox_->get_item_count() << "\n";
        select_row = gamelistbox_->get_item_count() - 1;
    }

    if(select_row >= 0 && select_row != gamelistbox_->get_selected_row()) {
        gamelistbox_->select_row(select_row);
    }

    update_selected_game();
    gamelist_dirty_ = false;
    last_lobby_update_ = SDL_GetTicks();
    lobby_info_.sync_games_display_status();
    lobby_info_.apply_game_filter();
    update_gamelist_header();
    gamelistbox_->set_row_shown(lobby_info_.games_visibility());
}

void mp_lobby::update_gamelist_header()
{
    const std::string games_string = VGETTEXT("Games: showing $num_shown out of $num_total", {
        {"num_shown", std::to_string(lobby_info_.games_visibility().count())},
        {"num_total", std::to_string(lobby_info_.games().size())}
    });

    find_widget<label>(gamelistbox_, "map", false).set_label(games_string);
}

std::map<std::string, string_map> mp_lobby::make_game_row_data(const mp::game_info& game)
{
    std::map<std::string, string_map> data;
    string_map item;

    item["use_markup"] = "true";

    color_t color_string;
    if(game.vacant_slots > 0) {
        color_string = (game.reloaded || game.started) ? font::YELLOW_COLOR : font::GOOD_COLOR;
    }

    const std::string scenario_text = VGETTEXT("$game_name (Era: $era_name)", {
        {"game_name", game.scenario},
        {"era_name", game.era}
    });

    item["label"] = game.vacant_slots > 0 ? colorize(game.name, color_string) : game.name;
    data.emplace("name", item);

    item["label"] = colorize("<i>" + scenario_text + "</i>", font::GRAY_COLOR);
    data.emplace("scenario", item);

    item["label"] = colorize(game.status, color_string);
    data.emplace("status", item);

    return data;
}

void mp_lobby::adjust_game_row_contents(const mp::game_info& game, grid* grid, bool add_callbacks)
{
    find_widget<styled_widget>(grid, "name", false).set_use_markup(true);
    find_widget<styled_widget>(grid, "status", false).set_use_markup(true);

    toggle_panel& row_panel = find_widget<toggle_panel>(grid, "panel", false);

    //
    // Game info
    //
    std::ostringstream ss;

    const auto mark_missing = [&ss]() {
        ss << ' ' << font::span_color(font::BAD_COLOR) << "(" << _("era_or_mod^not installed") << ")</span>";
    };

    ss << "<big>" << colorize(_("Era"), font::TITLE_COLOR) << "</big>\n" << game.era;

    if(!game.have_era) {
        // NOTE: not using colorize() here deliberately to avoid awkward string concatenation.
        mark_missing();
    }

    ss << "\n\n<big>" << colorize(_("Modifications"), font::TITLE_COLOR) << "</big>\n";

    auto mods = game.mod_info;

    if(mods.empty()) {
        ss << _("active_modifications^None") << "\n";
    } else {
        for(const auto& mod : mods) {
            ss << mod.first;

            if(!mod.second) {
                mark_missing();
            }

            ss << '\n';
        }
    }

    // TODO: move to some general are of the code.
    const auto yes_or_no = [](bool val) { return val ? _("yes") : _("no"); };

    ss << "\n<big>" << colorize(_("Settings"), font::TITLE_COLOR) << "</big>\n";
    ss << _("Experience modifier:")   << " " << game.xp << "\n";
    ss << _("Gold per village:")      << " " << game.gold << "\n";
    ss << _("Map size:")              << " " << game.map_size_info << "\n";
    ss << _("Reloaded:")              << " " << yes_or_no(game.reloaded) << "\n";
    ss << _("Shared vision:")         << " " << game.vision << "\n";
    ss << _("Shuffle sides:")         << " " << yes_or_no(game.shuffle_sides) << "\n";
    ss << _("Time limit:")            << " " << game.time_limit << "\n";
    ss << _("Use map settings:")      << " " << yes_or_no(game.use_map_settings);

    image& info_icon = find_widget<image>(grid, "game_info", false);

    if(!game.have_era || !game.have_all_mods || !game.required_addons.empty()) {
        info_icon.set_label("icons/icon-info-error.png");

        ss << "\n\n<span color='#f00' size='x-large'>! </span>";
        ss << _("One or more add-ons need to be installed\nin order to join this game.");
    } else {
        info_icon.set_label("icons/icon-info.png");
    }

    info_icon.set_tooltip(ss.str());

    //
    // Password icon
    //
    image& password_icon = find_widget<image>(grid, "needs_password", false);

    if(game.password_required) {
        password_icon.set_visible(widget::visibility::visible);
    } else {
        password_icon.set_visible(widget::visibility::hidden);
    }

    //
    // Observer icon
    //
    image& observer_icon = find_widget<image>(grid, "observer_icon", false);

    if(game.observers) {
        observer_icon.set_label("misc/eye.png");
        observer_icon.set_tooltip( _("Observers allowed"));
    } else {
        observer_icon.set_label("misc/no_observer.png");
        observer_icon.set_tooltip( _("Observers not allowed"));
    }

    //
    // Minimap
    //
    minimap& map = find_widget<minimap>(grid, "minimap", false);

    map.set_config(&game_config_);
    map.set_map_data(game.map_data);

    if(!add_callbacks) {
        return;
    }

    connect_signal_mouse_left_double_click(row_panel,
        std::bind(&mp_lobby::enter_game_by_id, this, game.id, DO_EITHER));
}

void mp_lobby::update_gamelist_filter()
{
    DBG_LB << "mp_lobby::update_gamelist_filter\n";
    lobby_info_.apply_game_filter();
    DBG_LB << "Games in lobby_info: " << lobby_info_.games().size()
           << ", games in listbox: " << gamelistbox_->get_item_count() << "\n";
    assert(lobby_info_.games().size() == gamelistbox_->get_item_count());
    gamelistbox_->set_row_shown(lobby_info_.games_visibility());

    update_gamelist_header();
}

void mp_lobby::update_playerlist()
{
    SCOPE_LB;
    DBG_LB << "Playerlist update: " << lobby_info_.users().size() << "\n";
    lobby_info_.update_user_statuses(selected_game_id_, chatbox_->active_window_room());

#ifdef ENABLE_ROOM_MEMBER_TREE
    bool lobby = false;
    if(mp::room_info* ri = chatbox_->active_window_room()) {
        if(ri->name() == "lobby") {
            lobby = true;
        }
    }
#endif

    assert(player_list_.active_game.tree);
#ifdef ENABLE_ROOM_MEMBER_TREE
    assert(player_list_.active_room.tree);
#endif
    assert(player_list_.other_games.tree);
    assert(player_list_.other_rooms.tree);

    unsigned scrollbar_position = player_list_.tree->get_vertical_scrollbar_item_position();

    player_list_.active_game.tree->clear();
#ifdef ENABLE_ROOM_MEMBER_TREE
    player_list_.active_room.tree->clear();
#endif
    player_list_.other_games.tree->clear();
    player_list_.other_rooms.tree->clear();

    for(auto& user : lobby_info_.users()) {
        sub_player_list* target_list(nullptr);

        std::string name = user.name;

        std::stringstream icon_ss;
        icon_ss << "lobby/status";
        switch(user.state) {
#ifdef ENABLE_ROOM_MEMBER_TREE
            case mp::user_info::SEL_ROOM:
                icon_ss << "-lobby";
                target_list = &player_list_.active_room;
                if(lobby) {
                    target_list = &player_list_.other_rooms;
                }
                break;
#endif
            case mp::user_info::LOBBY:
                icon_ss << "-lobby";
                target_list = &player_list_.other_rooms;
                break;
            case mp::user_info::SEL_GAME:
                name = colorize(name, {0, 255, 255});
                icon_ss << (user.observing ? "-obs" : "-playing");
                target_list = &player_list_.active_game;
                break;
            case mp::user_info::GAME:
                name = colorize(name, font::BAD_COLOR);
                icon_ss << (user.observing ? "-obs" : "-playing");
                target_list = &player_list_.other_games;
                break;
            default:
                ERR_LB << "Bad user state in lobby: " << user.name << ": "
                       << user.state << "\n";
                continue;
        }

        switch(user.relation) {
            case mp::user_info::ME:
                icon_ss << "-s";
                break;
            case mp::user_info::NEUTRAL:
                icon_ss << "-n";
                break;
            case mp::user_info::FRIEND:
                icon_ss << "-f";
                break;
            case mp::user_info::IGNORED:
                icon_ss << "-i";
                break;
            default:
                ERR_LB << "Bad user relation in lobby: " << user.relation
                       << "\n";
        }

        // TODO: on the official server this results in every name being bold since we
        // require a registered account. Leaving this commented out in case we ever
        // walk that back and want to have such an indication again (it's useless for
        // custom servers since registered logins aren't supported there).
#if 0
        if(user.registered) {
            name = "<b>" + name + "</b>";
        }
#endif

        icon_ss << ".png";

        if(!preferences::playerlist_group_players()) {
            target_list = &player_list_.other_rooms;
        }

        assert(target_list->tree);

        string_map tree_group_field;
        std::map<std::string, string_map> tree_group_item;

        /*** Add tree item ***/
        tree_group_field["label"] = icon_ss.str();
        tree_group_item["icon"] = tree_group_field;

        tree_group_field["label"] = name;
        tree_group_field["use_markup"] = "true";
        tree_group_item["name"] = tree_group_field;

        tree_view_node& player = target_list->tree->add_child("player", tree_group_item);

        connect_signal_mouse_left_double_click(find_widget<toggle_panel>(&player, "tree_view_node_label", false),
            std::bind(&mp_lobby::user_dialog_callback, this, &user));
    }

    player_list_.active_game.update_player_count_label();
#ifdef ENABLE_ROOM_MEMBER_TREE
    player_list_.active_room.update_player_count_label();
#endif
    player_list_.other_rooms.update_player_count_label();
    player_list_.other_games.update_player_count_label();

    // Don't attempt to restore the scroll position if the window hasn't been laid out yet
    if(player_list_.tree->get_origin() != point{-1, -1}) {
        player_list_.tree->set_vertical_scrollbar_item_position(scrollbar_position);
    }

    player_list_dirty_ = false;
    last_lobby_update_ = SDL_GetTicks();
}

void mp_lobby::update_selected_game()
{
    const int idx = gamelistbox_->get_selected_row();
    bool can_join = false, can_observe = false;

    if(idx >= 0) {
        const mp::game_info& game = *lobby_info_.games()[idx];
        can_observe = game.can_observe();
        can_join = game.can_join();
        selected_game_id_ = game.id;
    } else {
        selected_game_id_ = 0;
    }

    find_widget<button>(get_window(), "observe_global", false).set_active(can_observe);
    find_widget<button>(get_window(), "join_global", false).set_active(can_join);

    player_list_dirty_ = true;
}

bool mp_lobby::exit_hook(window& window)
{
    if(window.get_retval() == retval::CANCEL) {
        return quit();
    }

    return true;
}

void mp_lobby::pre_show(window& window)
{
    SCOPE_LB;

    gamelistbox_ = find_widget<listbox>(&window, "game_list", false, true);

    connect_signal_notify_modified(*gamelistbox_,
            std::bind(&mp_lobby::gamelist_change_callback, this));

    player_list_.init(window);

    window.set_enter_disabled(true);

    // Exit hook to add a confirmation when quitting the Lobby.
    window.set_exit_hook(std::bind(&mp_lobby::exit_hook, this, std::ref(window)));

    chatbox_ = find_widget<chatbox>(&window, "chat", false, true);

    window.keyboard_capture(chatbox_);

    chatbox_->set_lobby_info(lobby_info_);
    chatbox_->set_wesnothd_connection(network_connection_);
    chatbox_->set_active_window_changed_callback([this]() { player_list_dirty_ = true; });
    chatbox_->load_log(default_chat_log, true);

    find_widget<button>(&window, "create", false).set_retval(CREATE);

    connect_signal_mouse_left_click(
        find_widget<button>(&window, "show_preferences", false),
        std::bind(&mp_lobby::show_preferences_button_callback, this, std::ref(window)));

    connect_signal_mouse_left_click(
        find_widget<button>(&window, "join_global", false),
        std::bind(&mp_lobby::enter_selected_game, this, DO_JOIN));

    find_widget<button>(&window, "join_global", false).set_active(false);

    connect_signal_mouse_left_click(
        find_widget<button>(&window, "observe_global", false),
        std::bind(&mp_lobby::enter_selected_game, this, DO_OBSERVE));

    find_widget<button>(&window, "observe_global", false).set_active(false);

    menu_button& replay_options = find_widget<menu_button>(&window, "replay_options", false);

    if(preferences::skip_mp_replay()) {
        replay_options.set_selected(1);
    }

    if(preferences::blindfold_replay()) {
        replay_options.set_selected(2);
    }

    connect_signal_notify_modified(replay_options,
        std::bind(&mp_lobby::skip_replay_changed_callback, this, std::ref(window)));

    filter_friends_ = find_widget<toggle_button>(&window, "filter_with_friends", false, true);
    filter_ignored_ = find_widget<toggle_button>(&window, "filter_without_ignored", false, true);
    filter_slots_   = find_widget<toggle_button>(&window, "filter_vacant_slots", false, true);
    filter_invert_  = find_widget<toggle_button>(&window, "filter_invert", false, true);
    filter_text_    = find_widget<text_box>(&window, "filter_text", false, true);

    connect_signal_notify_modified(*filter_friends_,
        std::bind(&mp_lobby::game_filter_change_callback, this));

    connect_signal_notify_modified(*filter_ignored_,
        std::bind(&mp_lobby::game_filter_change_callback, this));

    connect_signal_notify_modified(*filter_slots_,
        std::bind(&mp_lobby::game_filter_change_callback, this));

    connect_signal_notify_modified(*filter_invert_,
        std::bind(&mp_lobby::game_filter_change_callback, this));

    connect_signal_pre_key_press(
            *filter_text_,
            std::bind(&mp_lobby::game_filter_keypress_callback, this, _5));

    chatbox_->room_window_open(N_("lobby"), true, false);
    chatbox_->active_window_changed();
    game_filter_reload();

    // Force first update to be directly.
    update_gamelist();
    update_playerlist();

    // TODO: currently getting a crash in the chatbox if we use this.
    // -- vultraz, 2017-11-10
    //mp_lobby::network_handler();

    lobby_update_timer_ = add_timer(
        game_config::lobby_network_timer, std::bind(&mp_lobby::network_handler, this), true);

    // Set up Lua plugin context
    plugins_context_.reset(new plugins_context("Multiplayer Lobby"));

    plugins_context_->set_callback("join",    [&, this](const config&) {
        enter_game_by_id(selected_game_id_, DO_JOIN);
    }, true);

    plugins_context_->set_callback("observe", [&, this](const config&) {
        enter_game_by_id(selected_game_id_, DO_OBSERVE);
    }, true);

    plugins_context_->set_callback("create", [&window](const config&) { window.set_retval(CREATE); }, true);
    plugins_context_->set_callback("quit", [&window](const config&) { window.set_retval(retval::CANCEL); }, false);

    plugins_context_->set_callback("chat", [this](const config& cfg) { chatbox_->send_chat_message(cfg["message"], false); }, true);
    plugins_context_->set_callback("select_game", [this](const config& cfg) {
        selected_game_id_ = cfg.has_attribute("id") ? cfg["id"].to_int() : lobby_info_.games()[cfg["index"].to_int()]->id;
    }, true);

    plugins_context_->set_accessor("game_list",   [this](const config&) { return lobby_info_.gamelist(); });
    plugins_context_->set_accessor("game_config", [this](const config&) { return game_config_; });
}

void mp_lobby::post_show(window& /*window*/)
{
    remove_timer(lobby_update_timer_);
    lobby_update_timer_ = 0;
    plugins_context_.reset();
}

void mp_lobby::network_handler()
{
    try {
        config data;
        if (network_connection_.receive_data(data)) {
            process_network_data(data);
        }
    } catch (const wesnothd_error& e) {
        LOG_LB << "caught wesnothd_error in network_handler: " << e.message << "\n";
        throw;
    }

    if ((SDL_GetTicks() - last_lobby_update_ < game_config::lobby_refresh)) {
        return;
    }

    if(gamelist_diff_update_ && !lobby_info_.gamelist_initialized()) {
        //don't process a corrupted gamelist further to prevent crashes later.
        return;
    }

    if(gamelist_dirty_ && !delay_gamelist_update_) {
        if(gamelist_diff_update_) {
            update_gamelist_diff();
        } else {
            update_gamelist();
            gamelist_diff_update_ = true;
        }
    }

    if(player_list_dirty_ && !delay_playerlist_update_) {
        update_gamelist_filter();
        update_playerlist();
    }
}

void mp_lobby::process_network_data(const config& data)
{
    if(const config& error = data.child("error")) {
        throw wesnothd_error(error["message"]);
    } else if(data.child("gamelist")) {
        process_gamelist(data);
    } else if(const config& gamelist_diff = data.child("gamelist_diff")) {
        process_gamelist_diff(gamelist_diff);
    }

    chatbox_->process_network_data(data);
}

void mp_lobby::process_gamelist(const config& data)
{
    lobby_info_.process_gamelist(data);
    DBG_LB << "Received gamelist\n";
    gamelist_dirty_ = true;
    gamelist_diff_update_ = false;
}

void mp_lobby::process_gamelist_diff(const config& data)
{
    if(lobby_info_.process_gamelist_diff(data)) {
        DBG_LB << "Received gamelist diff\n";
        gamelist_dirty_ = true;
    } else {
        ERR_LB << "process_gamelist_diff failed!" << std::endl;
        refresh_lobby();
    }
    const int joined = data.child_count("insert_child");
    const int left = data.child_count("remove_child");
    if(joined > 0 || left > 0) {
        if(left > joined) {
            do_notify(mp::NOTIFY_LOBBY_QUIT);
        } else {
            do_notify(mp::NOTIFY_LOBBY_JOIN);
        }
    }
}

void mp_lobby::enter_game(const mp::game_info& game, JOIN_MODE mode)
{
    switch(mode) {
    case DO_JOIN:
        if(!game.can_join()) {
            ERR_LB << "Attempted to join a game with no vacant slots" << std::endl;
            return;
        }

        break;
    case DO_OBSERVE:
        if(!game.can_observe()) {
            ERR_LB << "Attempted to observe a game with observers disabled" << std::endl;
            return;
        }

        break;
    case DO_EITHER:
        if(game.can_join()) {
            mode = DO_JOIN;
        } else if(game.can_observe()) {
            mode = DO_OBSERVE;
        } else {
            DBG_LB << "Cannot join or observe a game." << std::endl;
            return;
        }

        break;
    }

    const bool try_join = mode == DO_JOIN;
    const bool try_obsv = mode == DO_OBSERVE;

    window& window = *get_window();

    // Prompt user to download this game's required addons if its requirements have not been met
    if(game.addons_outcome != mp::game_info::SATISFIED) {
        if(game.required_addons.empty()) {
            gui2::show_error_message(_("Something is wrong with the addon version check database supporting the multiplayer lobby. Please report this at https://bugs.wesnoth.org."));
            return;
        }

        if(!handle_addon_requirements_gui(game.required_addons, game.addons_outcome)) {
            return;
        }

        // Addons have been downloaded, so the game_config and installed addons list need to be reloaded.
        // The lobby is closed and reopened.
        window.set_retval(RELOAD_CONFIG);
        return;
    }

    config response;

    config& join_data = response.add_child("join");
    join_data["id"] = std::to_string(game.id);
    join_data["observe"] = try_obsv;

    if(!join_data.empty() && try_join && game.password_required) {
        std::string password;

        if(!gui2::dialogs::mp_join_game_password_prompt::execute(password)) {
            return;
        }

        join_data["password"] = password;
    }

    network_connection_.send_data(response);
    joined_game_id_ = game.id;

    // We're all good. Close lobby and proceed to game!
    window.set_retval(try_join ? JOIN : OBSERVE);
}

void mp_lobby::enter_game_by_index(const int index, JOIN_MODE mode)
{
    try {
        enter_game(*lobby_info_.games().at(index), mode);
    } catch(const std::out_of_range&) {
        // Game index was invalid!
        ERR_LB << "Attempted to join/observe a game with index out of range: " << index << ". "
               << "Games vector size is " << lobby_info_.games().size() << std::endl;
    }
}

void mp_lobby::enter_game_by_id(const int game_id, JOIN_MODE mode)
{
    mp::game_info* game_ptr = lobby_info_.get_game_by_id(game_id);

    if(!game_ptr) {
        ERR_LB << "Attempted to join/observe a game with an invalid id: " << game_id << std::endl;
        return;
    }

    enter_game(*game_ptr, mode);
}

void mp_lobby::enter_selected_game(JOIN_MODE mode)
{
    enter_game_by_index(gamelistbox_->get_selected_row(), mode);
}

void mp_lobby::refresh_lobby()
{
    network_connection_.send_data(config("refresh_lobby"));
}

void mp_lobby::show_preferences_button_callback(window& window)
{
    gui2::dialogs::preferences_dialog::display(game_config_);

    /**
     * The screen size might have changed force an update of the size.
     *
     * @todo This might no longer be needed when gui2 is done.
     */
    const SDL_Rect rect = window.video().screen_area();

    gui2::settings::gamemap_width  += rect.w - gui2::settings::screen_width;
    gui2::settings::gamemap_height += rect.h - gui2::settings::screen_height;
    gui2::settings::screen_width    = rect.w;
    gui2::settings::screen_height   = rect.h;

    /**
     * The screen size might have changed force an update of the size.
     *
     * @todo This might no longer be needed when gui2 is done.
     */
    window.invalidate_layout();

    refresh_lobby();
}

void mp_lobby::game_filter_reload()
{
    lobby_info_.clear_game_filter();

    for(const auto& s : utils::split(filter_text_->get_value(), ' ')) {
        lobby_info_.add_game_filter([s](const mp::game_info& info)->bool {
            return info.match_string_filter(s);
        });
    }

    // TODO: make changing friend/ignore lists trigger a refresh
    if(filter_friends_->get_value()) {
        lobby_info_.add_game_filter([](const mp::game_info& info)->bool {
            return info.has_friends == true;
        });
    }

    if(filter_ignored_->get_value()) {
        lobby_info_.add_game_filter([](const mp::game_info& info)->bool {
            return info.has_ignored == false;
        });
    }

    if(filter_slots_->get_value()) {
        lobby_info_.add_game_filter([](const mp::game_info& info)->bool {
            return info.vacant_slots > 0;
        });
    }

    lobby_info_.set_game_filter_invert(filter_invert_->get_value_bool());
}

void mp_lobby::game_filter_keypress_callback(const SDL_Keycode key)
{
    if(key == SDLK_RETURN || key == SDLK_KP_ENTER) {
        game_filter_reload();
        update_gamelist_filter();
    }
}

void mp_lobby::game_filter_change_callback()
{
    game_filter_reload();
    update_gamelist_filter();
}

void mp_lobby::gamelist_change_callback()
{
    update_selected_game();
}

void mp_lobby::player_filter_callback()
{
    player_list_dirty_ = true;
    // get_window()->invalidate_layout();
}

void mp_lobby::user_dialog_callback(mp::user_info* info)
{
    lobby_player_info dlg(*chatbox_, *info, lobby_info_);

    lobby_delay_gamelist_update_guard g(*this);

    dlg.show();

    delay_playerlist_update_ = true;

    if(dlg.result_open_whisper()) {
        lobby_chat_window* t = chatbox_->whisper_window_open(info->name, true);
        chatbox_->switch_to_window(t);
    }

    selected_game_id_ = info->game_id;

    // do not update here as it can cause issues with removing the widget
    // from within it's event handler. Should get updated as soon as possible
    // update_gamelist();
    delay_playerlist_update_ = false;
    player_list_dirty_ = true;
    refresh_lobby();
}

void mp_lobby::skip_replay_changed_callback(window& window)
{
    // TODO: this prefence should probably be controlled with an enum
    const int value = find_widget<menu_button>(&window, "replay_options", false).get_value();
    preferences::set_skip_mp_replay(value == 1);
    preferences::set_blindfold_replay(value == 2);
}

} // namespace dialogs
} // namespace gui2