team.cpp

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/*
    Copyright (C) 2003 - 2021
    by David White <dave@whitevine.net>
    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.
*/

/**
 *  @file
 *  Team-management, allies, setup at start of scenario.
 */

#include "team.hpp"

#include "ai/manager.hpp"
#include "color.hpp"
#include "formula/string_utils.hpp"     // for VGETTEXT
#include "game_data.hpp"
#include "game_events/pump.hpp"
#include "lexical_cast.hpp"
#include "map/map.hpp"
#include "play_controller.hpp"
#include "playsingle_controller.hpp"
#include "preferences/game.hpp"
#include "resources.hpp"
#include "serialization/string_utils.hpp"
#include "synced_context.hpp"
#include "units/types.hpp"
#include "whiteboard/side_actions.hpp"

static lg::log_domain log_engine("engine");
#define DBG_NG LOG_STREAM(debug, log_engine)
#define LOG_NG LOG_STREAM(info, log_engine)
#define WRN_NG LOG_STREAM(warn, log_engine)
#define ERR_NG LOG_STREAM(err, log_engine)

static lg::log_domain log_engine_enemies("engine/enemies");
#define DBG_NGE LOG_STREAM(debug, log_engine_enemies)
#define LOG_NGE LOG_STREAM(info, log_engine_enemies)
#define WRN_NGE LOG_STREAM(warn, log_engine_enemies)

// Static member initialization
const int team::default_team_gold_ = 100;

// Update this list of attributes if you change what is used to define a side
// (excluding those attributes used to define the side's leader).
const std::set<std::string> team::attributes {
    "ai_config",
    "carryover_add",
    "carryover_percentage",
    "color",
    "controller",
    "current_player",
    "defeat_condition",
    "flag",
    "flag_icon",
    "fog",
    "fog_data",
    "gold",
    "hidden",
    "income",
    "no_leader",
    "objectives",
    "objectives_changed",
    "persistent",
    "lost",
    "recall_cost",
    "recruit",
    "previous_recruits",
    "save_id",
    "scroll_to_leader",
    "share_vision",
    "share_maps",
    "share_view",
    "shroud",
    "shroud_data",
    "start_gold",
    "suppress_end_turn_confirmation",
    "team_name",
    "user_team_name",
    "side_name",
    "village_gold",
    "village_support",
    "is_local",
    // Multiplayer attributes.
    "player_id",
    "is_host",
    "action_bonus_count",
    "allow_changes",
    "allow_player",
    "color_lock",
    "countdown_time",
    "disallow_observers",
    "faction",
    "faction_from_recruit",
    "faction_name",
    "faction_lock",
    "gold_lock",
    "income_lock",
    "leader",
    "leader_lock",
    "random_leader",
    "team_lock",
    "terrain_liked",
    "user_description",
    "controller_lock",
    "chose_random",
    "disallow_shuffle",
    "description"
};

team::team_info::team_info()
    : gold(0)
    , start_gold(0)
    , income(0)
    , income_per_village(0)
    , support_per_village(1)
    , minimum_recruit_price(0)
    , recall_cost(0)
    , can_recruit()
    , team_name()
    , user_team_name()
    , side_name()
    , faction()
    , faction_name()
    , save_id()
    , current_player()
    , countdown_time()
    , action_bonus_count(0)
    , flag()
    , flag_icon()
    , id()
    , scroll_to_leader(true)
    , objectives()
    , objectives_changed(false)
    , controller()
    , is_local(true)
    , defeat_condition(team::DEFEAT_CONDITION::NO_LEADER)
    , proxy_controller(team::PROXY_CONTROLLER::PROXY_HUMAN)
    , share_vision(team::SHARE_VISION::ALL)
    , disallow_observers(false)
    , allow_player(false)
    , chose_random(false)
    , no_leader(true)
    , hidden(true)
    , no_turn_confirmation(false)
    , color()
    , side(1)
    , persistent(false)
    , lost(false)
    , carryover_percentage(game_config::gold_carryover_percentage)
    , carryover_add(false)
    , carryover_bonus(0)
    , carryover_gold(0)
{
}

void team::team_info::read(const config& cfg)
{
    gold = cfg["gold"];
    income = cfg["income"];
    team_name = cfg["team_name"].str();
    user_team_name = cfg["user_team_name"];
    side_name = cfg["side_name"];
    faction = cfg["faction"].str();
    faction_name = cfg["faction_name"];
    save_id = cfg["save_id"].str();
    current_player = cfg["current_player"].str();
    countdown_time = cfg["countdown_time"].str();
    action_bonus_count = cfg["action_bonus_count"];
    flag = cfg["flag"].str();
    flag_icon = cfg["flag_icon"].str();
    id = cfg["id"].str();
    scroll_to_leader = cfg["scroll_to_leader"].to_bool(true);
    objectives = cfg["objectives"];
    objectives_changed = cfg["objectives_changed"].to_bool();
    disallow_observers = cfg["disallow_observers"].to_bool();
    allow_player = cfg["allow_player"].to_bool(true);
    chose_random = cfg["chose_random"].to_bool(false);
    no_leader = cfg["no_leader"].to_bool();
    defeat_condition = cfg["defeat_condition"].to_enum<team::DEFEAT_CONDITION>(team::DEFEAT_CONDITION::NO_LEADER);
    lost = cfg["lost"].to_bool(false);
    hidden = cfg["hidden"].to_bool();
    no_turn_confirmation = cfg["suppress_end_turn_confirmation"].to_bool();
    side = cfg["side"].to_int(1);
    carryover_percentage = cfg["carryover_percentage"].to_int(game_config::gold_carryover_percentage);
    carryover_add = cfg["carryover_add"].to_bool(false);
    carryover_bonus = cfg["carryover_bonus"].to_double(1);
    carryover_gold = cfg["carryover_gold"].to_int(0);
    variables = cfg.child_or_empty("variables");
    is_local = cfg["is_local"].to_bool(true);

    color = get_side_color_id_from_config(cfg);

    // If starting new scenario override settings from [ai] tags
    if(!user_team_name.translatable())
        user_team_name = t_string::from_serialized(user_team_name);

    if(ai::manager::has_manager()) {
        if(cfg.has_attribute("ai_config")) {
            ai::manager::get_singleton().add_ai_for_side_from_file(side, cfg["ai_config"], true);
        } else {
            ai::manager::get_singleton().add_ai_for_side_from_config(side, cfg, true);
        }
    }

    std::vector<std::string> recruits = utils::split(cfg["recruit"]);
    can_recruit.insert(recruits.begin(), recruits.end());

    // at the start of a scenario "start_gold" is not set, we need to take the
    // value from the gold setting (or fall back to the gold default)
    if(!cfg["start_gold"].empty()) {
        start_gold = cfg["start_gold"];
    } else if(!cfg["gold"].empty()) {
        start_gold = gold;
    } else {
        start_gold = default_team_gold_;
    }

    if(team_name.empty()) {
        team_name = cfg["side"].str();
    }

    if(save_id.empty()) {
        save_id = id;
    }

    income_per_village = cfg["village_gold"].to_int(game_config::village_income);
    recall_cost = cfg["recall_cost"].to_int(game_config::recall_cost);

    const std::string& village_support = cfg["village_support"];
    if(village_support.empty()) {
        support_per_village = game_config::village_support;
    } else {
        support_per_village = lexical_cast_default<int>(village_support, game_config::village_support);
    }

    controller = team::CONTROLLER::AI;
    controller.parse(cfg["controller"].str());

    // TODO: Why do we read disallow observers differently when controller is empty?
    if(controller == CONTROLLER::EMPTY) {
        disallow_observers = cfg["disallow_observers"].to_bool(true);
    }

    // override persistence flag if it is explicitly defined in the config
    // by default, persistence of a team is set depending on the controller
    persistent = cfg["persistent"].to_bool(this->controller == CONTROLLER::HUMAN);

    //========================================================
    // END OF MESSY CODE

    // Share_view and share_maps can't both be enabled,
    // so share_view overrides share_maps.
    share_vision = cfg["share_vision"].to_enum<team::SHARE_VISION>(team::SHARE_VISION::ALL);
    handle_legacy_share_vision(cfg);

    LOG_NG << "team_info::team_info(...): team_name: " << team_name << ", share_vision: " << share_vision << ".\n";
}

void team::team_info::handle_legacy_share_vision(const config& cfg)
{
    if(cfg.has_attribute("share_view") || cfg.has_attribute("share_maps")) {
        if(cfg["share_view"].to_bool()) {
            share_vision = team::SHARE_VISION::ALL;
        } else if(cfg["share_maps"].to_bool(true)) {
            share_vision = team::SHARE_VISION::SHROUD;
        } else {
            share_vision = team::SHARE_VISION::NONE;
        }
    }
}

void team::team_info::write(config& cfg) const
{
    cfg["gold"] = gold;
    cfg["start_gold"] = start_gold;
    cfg["income"] = income;
    cfg["team_name"] = team_name;
    cfg["user_team_name"] = user_team_name;
    cfg["side_name"] = side_name;
    cfg["faction"] = faction;
    cfg["faction_name"] = faction_name;
    cfg["save_id"] = save_id;
    cfg["current_player"] = current_player;
    cfg["flag"] = flag;
    cfg["flag_icon"] = flag_icon;
    cfg["id"] = id;
    cfg["objectives"] = objectives;
    cfg["objectives_changed"] = objectives_changed;
    cfg["countdown_time"] = countdown_time;
    cfg["action_bonus_count"] = action_bonus_count;
    cfg["village_gold"] = income_per_village;
    cfg["village_support"] = support_per_village;
    cfg["recall_cost"] = recall_cost;
    cfg["disallow_observers"] = disallow_observers;
    cfg["allow_player"] = allow_player;
    cfg["chose_random"] = chose_random;
    cfg["no_leader"] = no_leader;
    cfg["defeat_condition"] = defeat_condition;
    cfg["hidden"] = hidden;
    cfg["suppress_end_turn_confirmation"] = no_turn_confirmation;
    cfg["scroll_to_leader"] = scroll_to_leader;
    cfg["controller"] = controller;
    cfg["recruit"] = utils::join(can_recruit);
    cfg["share_vision"] = share_vision;

    cfg["color"] = color;
    cfg["persistent"] = persistent;
    cfg["lost"] = lost;
    cfg["carryover_percentage"] = carryover_percentage;
    cfg["carryover_add"] = carryover_add;
    cfg["carryover_bonus"] = carryover_bonus;
    cfg["carryover_gold"] = carryover_gold;

    if(!variables.empty()) {
        cfg.add_child("variables", variables);
    }

    cfg.add_child("ai", ai::manager::get_singleton().to_config(side));
}

team::team()
    : gold_(0)
    , villages_()
    , shroud_()
    , fog_()
    , fog_clearer_()
    , auto_shroud_updates_(true)
    , info_()
    , countdown_time_(0)
    , action_bonus_count_(0)
    , recall_list_()
    , last_recruit_()
    , enemies_()
    , ally_shroud_()
    , ally_fog_()
    , planned_actions_()
{
}

team::~team()
{
}

void team::build(const config& cfg, const gamemap& map, int gold)
{
    gold_ = gold;
    info_.read(cfg);

    fog_.set_enabled(cfg["fog"].to_bool());
    fog_.read(cfg["fog_data"]);
    shroud_.set_enabled(cfg["shroud"].to_bool());
    shroud_.read(cfg["shroud_data"]);
    auto_shroud_updates_ = cfg["auto_shroud"].to_bool(auto_shroud_updates_);

    LOG_NG << "team::team(...): team_name: " << info_.team_name << ", shroud: " << uses_shroud()
           << ", fog: " << uses_fog() << ".\n";

    // Load the WML-cleared fog.
    const config& fog_override = cfg.child("fog_override");
    if(fog_override) {
        const std::vector<map_location> fog_vector
                = map.parse_location_range(fog_override["x"], fog_override["y"], true);
        fog_clearer_.insert(fog_vector.begin(), fog_vector.end());
    }

    // To ensure some minimum starting gold,
    // gold is the maximum of 'gold' and what is given in the config file
    gold_ = std::max(gold, info_.gold);
    if(gold_ != info_.gold) {
        info_.start_gold = gold;
    }

    // Old code was doing:
    // info_.start_gold = std::to_string(gold) + " (" + info_.start_gold + ")";
    // Was it correct?

    // Load in the villages the side controls at the start
    for(const config& v : cfg.child_range("village")) {
        map_location loc(v);
        if(map.is_village(loc)) {
            villages_.insert(loc);
        } else {
            WRN_NG << "[side] " << current_player() << " [village] points to a non-village location " << loc
                   << std::endl;
        }
    }

    countdown_time_ = cfg["countdown_time"];
    action_bonus_count_ = cfg["action_bonus_count"];

    planned_actions_.reset(new wb::side_actions());
    planned_actions_->set_team_index(info_.side - 1);
}

void team::write(config& cfg) const
{
    info_.write(cfg);
    cfg["auto_shroud"] = auto_shroud_updates_;
    cfg["shroud"] = uses_shroud();
    cfg["fog"] = uses_fog();
    cfg["gold"] = gold_;

    // Write village locations
    for(const map_location& loc : villages_) {
        loc.write(cfg.add_child("village"));
    }

    cfg["shroud_data"] = shroud_.write();
    cfg["fog_data"] = fog_.write();
    if(!fog_clearer_.empty())
        write_location_range(fog_clearer_, cfg.add_child("fog_override"));

    cfg["countdown_time"] = countdown_time_;
    cfg["action_bonus_count"] = action_bonus_count_;
}

void team::fix_villages(const gamemap &map)
{
    for (auto it = villages_.begin(); it != villages_.end(); ) {
        if (map.is_village(*it)) {
            ++it;
        }
        else {
            it = villages_.erase(it);
        }
    }
}

game_events::pump_result_t team::get_village(const map_location& loc, const int owner_side, game_data* gamedata)
{
    villages_.insert(loc);
    game_events::pump_result_t res;

    if(gamedata) {
        config::attribute_value& var = gamedata->get_variable("owner_side");
        const config::attribute_value old_value = var;
        var = owner_side;

        // During team building, game_events pump is not guaranteed to exist yet. (At current revision.) We skip capture
        // events in this case.
        if(resources::game_events) {
            res = resources::game_events->pump().fire("capture", loc);
        }

        if(old_value.blank()) {
            gamedata->clear_variable("owner_side");
        } else {
            var = old_value;
        }
    }

    return res;
}

void team::lose_village(const map_location& loc)
{
    const std::set<map_location>::const_iterator vil = villages_.find(loc);
    assert(vil != villages_.end());
    villages_.erase(vil);
}

void team::set_recruits(const std::set<std::string>& recruits)
{
    info_.can_recruit = recruits;
    info_.minimum_recruit_price = 0;
    ai::manager::get_singleton().raise_recruit_list_changed();
}

void team::add_recruit(const std::string& recruit)
{
    info_.can_recruit.insert(recruit);
    info_.minimum_recruit_price = 0;
    ai::manager::get_singleton().raise_recruit_list_changed();
}

int team::minimum_recruit_price() const
{
    if(info_.minimum_recruit_price) {
        return info_.minimum_recruit_price;
    }
    int min = 20;
    for(std::string recruit : info_.can_recruit) {
        const unit_type* ut = unit_types.find(recruit);
        if(!ut) {
            continue;
        } else {
            if(ut->cost() < min) {
                min = ut->cost();
            }
        }
    }

    info_.minimum_recruit_price = min;

    return info_.minimum_recruit_price;
}

void team::calculate_enemies(std::size_t index) const
{
    if(!resources::gameboard || index >= resources::gameboard->teams().size()) {
        return;
    }

    while(enemies_.size() <= index) {
        enemies_.push_back(calculate_is_enemy(enemies_.size()));
    }
}

bool team::calculate_is_enemy(std::size_t index) const
{
    // We're not enemies of ourselves
    if(&resources::gameboard->teams()[index] == this) {
        return false;
    }

    // We are friends with anyone who we share a teamname with
    std::vector<std::string> our_teams = utils::split(info_.team_name);
    std::vector<std::string> their_teams = utils::split(resources::gameboard->teams()[index].info_.team_name);

    LOG_NGE << "team " << info_.side << " calculates if it has enemy in team " << index + 1 << "; our team_name ["
            << info_.team_name << "], their team_name is [" << resources::gameboard->teams()[index].info_.team_name
            << "]" << std::endl;

    for(const std::string& t : our_teams) {
        if(std::find(their_teams.begin(), their_teams.end(), t) != their_teams.end()) {
            LOG_NGE << "team " << info_.side << " found same team name [" << t << "] in team " << index + 1
                    << std::endl;
            return false;
        } else {
            LOG_NGE << "team " << info_.side << " not found same team name [" << t << "] in team " << index + 1
                    << std::endl;
        }
    }

    LOG_NGE << "team " << info_.side << " has enemy in team " << index + 1 << std::endl;
    return true;
}

namespace
{
class controller_server_choice : public synced_context::server_choice
{
public:
    controller_server_choice(team::CONTROLLER new_controller, const team& team)
        : new_controller_(new_controller)
        , team_(team)
    {
    }

    /** We are in a game with no mp server and need to do this choice locally */
    virtual config local_choice() const
    {
        return config{"controller", new_controller_, "is_local", true};
    }

    /** The request which is sent to the mp server. */
    virtual config request() const
    {
        return config{
                "new_controller", new_controller_, "old_controller", team_.controller(), "side", team_.side(),
        };
    }

    virtual const char* name() const
    {
        return "change_controller_wml";
    }

private:
    team::CONTROLLER new_controller_;
    const team& team_;
};
} // end anon namespace

void team::change_controller_by_wml(const std::string& new_controller_string)
{
    CONTROLLER new_controller;
    if(!new_controller.parse(new_controller_string)) {
        WRN_NG << "ignored attempt to change controller to " << new_controller_string << std::endl;
        return;
    }

    if(new_controller == CONTROLLER::EMPTY && resources::controller->current_side() == this->side()) {
        WRN_NG << "ignored attempt to change the currently playing side's controller to 'null'" << std::endl;
        return;
    }

    config choice = synced_context::ask_server_choice(controller_server_choice(new_controller, *this));
    if(!new_controller.parse(choice["controller"])) {
        // TODO: this should be more than a ERR_NG message.
        // GL-2016SEP02 Oh? So why was ERR_NG defined as warning level? Making the call fit the definition.
        WRN_NG << "Received an invalid controller string from the server" << choice["controller"] << std::endl;
    }

    if(!resources::controller->is_replay()) {
        set_local(choice["is_local"].to_bool());
    }

    if(playsingle_controller* pc =  dynamic_cast<playsingle_controller*>(resources::controller)) {
        if(pc->current_side() == side() && new_controller != controller()) {
            pc->set_player_type_changed();
        }
    }

    change_controller(new_controller);
}

void team::change_team(const std::string& name, const t_string& user_name)
{
    info_.team_name = name;

    if(!user_name.empty()) {
        info_.user_team_name = user_name;
    } else {
        info_.user_team_name = name;
    }

    clear_caches();
}

void team::clear_caches()
{
    // Reset the cache of allies for all teams
    if(resources::gameboard) {
        for(auto& t : resources::gameboard->teams()) {
            t.enemies_.clear();
            t.ally_shroud_.clear();
            t.ally_fog_.clear();
        }
    }
}

void team::set_objectives(const t_string& new_objectives, bool silently)
{
    info_.objectives = new_objectives;

    if(!silently) {
        info_.objectives_changed = true;
    }
}

bool team::shrouded(const map_location& loc) const
{
    if(!resources::gameboard) {
        return shroud_.value(loc.wml_x(), loc.wml_y());
    }

    return shroud_.shared_value(ally_shroud(resources::gameboard->teams()), loc.wml_x(), loc.wml_y());
}

bool team::fogged(const map_location& loc) const
{
    if(shrouded(loc)) {
        return true;
    }

    // Check for an override of fog.
    if(fog_clearer_.count(loc) > 0) {
        return false;
    }

    if(!resources::gameboard) {
        return fog_.value(loc.wml_x(), loc.wml_y());
    }

    return fog_.shared_value(ally_fog(resources::gameboard->teams()), loc.wml_x(), loc.wml_y());
}

const std::vector<const shroud_map*>& team::ally_shroud(const std::vector<team>& teams) const
{
    if(ally_shroud_.empty()) {
        for(std::size_t i = 0; i < teams.size(); ++i) {
            if(!is_enemy(i + 1) && (&(teams[i]) == this || teams[i].share_view() || teams[i].share_maps())) {
                ally_shroud_.push_back(&(teams[i].shroud_));
            }
        }
    }

    return ally_shroud_;
}

const std::vector<const shroud_map*>& team::ally_fog(const std::vector<team>& teams) const
{
    if(ally_fog_.empty()) {
        for(std::size_t i = 0; i < teams.size(); ++i) {
            if(!is_enemy(i + 1) && (&(teams[i]) == this || teams[i].share_view())) {
                ally_fog_.push_back(&(teams[i].fog_));
            }
        }
    }

    return ally_fog_;
}

bool team::knows_about_team(std::size_t index) const
{
    const team& t = resources::gameboard->teams()[index];

    // We know about our own team
    if(this == &t) {
        return true;
    }

    // If we aren't using shroud or fog, then we know about everyone
    if(!uses_shroud() && !uses_fog()) {
        return true;
    }

    // We don't know about enemies
    if(is_enemy(index + 1)) {
        return false;
    }

    // We know our human allies.
    if(t.is_human()) {
        return true;
    }

    // We know about allies we're sharing maps with
    if(share_maps() && t.uses_shroud()) {
        return true;
    }

    // We know about allies we're sharing view with
    if(share_view() && (t.uses_fog() || t.uses_shroud())) {
        return true;
    }

    return false;
}

/**
 * Removes the record of hexes that were cleared of fog via WML.
 * @param[in] hexes The hexes to no longer keep clear.
 */
void team::remove_fog_override(const std::set<map_location>& hexes)
{
    // Take a set difference.
    std::vector<map_location> result(fog_clearer_.size());
    std::vector<map_location>::iterator result_end =
        std::set_difference(fog_clearer_.begin(), fog_clearer_.end(), hexes.begin(), hexes.end(), result.begin());

    // Put the result into fog_clearer_.
    fog_clearer_.clear();
    fog_clearer_.insert(result.begin(), result_end);
}

void validate_side(int side)
{
    if(!resources::gameboard) {
        return;
    }

    if(side < 1 || side > static_cast<int>(resources::gameboard->teams().size())) {
        throw game::game_error("invalid side(" + std::to_string(side) + ") found in unit definition");
    }
}

int shroud_map::width() const
{
    return data_.size();
}

int shroud_map::height() const
{
    if(data_.size() == 0) return 0;
    return std::max_element(data_.begin(), data_.end(), [](const auto& a, const auto& b) {
        return a.size() < b.size();
    })->size();
}

bool shroud_map::clear(int x, int y)
{
    if(enabled_ == false || x < 0 || y < 0) {
        return false;
    }

    if(x >= static_cast<int>(data_.size())) {
        data_.resize(x + 1);
    }

    if(y >= static_cast<int>(data_[x].size())) {
        data_[x].resize(y + 1);
    }

    if(data_[x][y] == false) {
        data_[x][y] = true;
        return true;
    }

    return false;
}

void shroud_map::place(int x, int y)
{
    if(enabled_ == false || x < 0 || y < 0) {
        return;
    }

    if(x >= static_cast<int>(data_.size())) {
        DBG_NG << "Couldn't place shroud on invalid x coordinate: (" << x << ", " << y
               << ") - max x: " << data_.size() - 1 << "\n";
    } else if(y >= static_cast<int>(data_[x].size())) {
        DBG_NG << "Couldn't place shroud on invalid y coordinate: (" << x << ", " << y
               << ") - max y: " << data_[x].size() - 1 << "\n";
    } else {
        data_[x][y] = false;
    }
}

void shroud_map::reset()
{
    if(enabled_ == false) {
        return;
    }

    for(auto& i : data_) {
        std::fill(i.begin(), i.end(), false);
    }
}

bool shroud_map::value(int x, int y) const
{
    if(!enabled_) {
        return false;
    }

    // Locations for which we have no data are assumed to still be covered.
    if(x < 0 || x >= static_cast<int>(data_.size())) {
        return true;
    }

    if(y < 0 || y >= static_cast<int>(data_[x].size())) {
        return true;
    }

    // data_ stores whether or not a location has been cleared, while
    // we want to return whether or not a location is covered.
    return !data_[x][y];
}

bool shroud_map::shared_value(const std::vector<const shroud_map*>& maps, int x, int y) const
{
    if(!enabled_) {
        return false;
    }

    // A quick abort:
    if(x < 0 || y < 0) {
        return true;
    }

    // A tile is uncovered if it is uncovered on any shared map.
    for(const shroud_map* const shared_map : maps) {
        if(shared_map->enabled_ && !shared_map->value(x, y)) {
            return false;
        }
    }

    return true;
}

std::string shroud_map::write() const
{
    std::stringstream shroud_str;
    for(const auto& sh : data_) {
        shroud_str << '|';

        for(bool i : sh) {
            shroud_str << (i ? '1' : '0');
        }

        shroud_str << '\n';
    }

    return shroud_str.str();
}

void shroud_map::read(const std::string& str)
{
    data_.clear();

    for(const char sh : str) {
        if(sh == '|') {
            data_.resize(data_.size() + 1);
        }

        if(data_.empty() == false) {
            if(sh == '1') {
                data_.back().push_back(true);
            } else if(sh == '0') {
                data_.back().push_back(false);
            }
        }
    }
}

void shroud_map::merge(const std::string& str)
{
    int x = 0, y = 0;
    for(std::size_t i = 1; i < str.length(); ++i) {
        if(str[i] == '|') {
            y = 0;
            x++;
        } else if(str[i] == '1') {
            clear(x, y);
            y++;
        } else if(str[i] == '0') {
            y++;
        }
    }
}

bool shroud_map::copy_from(const std::vector<const shroud_map*>& maps)
{
    if(enabled_ == false) {
        return false;
    }

    bool cleared = false;
    for(const shroud_map* m : maps) {
        if(m->enabled_ == false) {
            continue;
        }

        const std::vector<std::vector<bool>>& v = m->data_;
        for(std::size_t x = 0; x != v.size(); ++x) {
            for(std::size_t y = 0; y != v[x].size(); ++y) {
                if(v[x][y]) {
                    cleared |= clear(x, y);
                }
            }
        }
    }

    return cleared;
}

const color_range team::get_side_color_range(int side)
{
    std::string index = get_side_color_id(side);
    std::map<std::string, color_range>::iterator gp = game_config::team_rgb_range.find(index);

    if(gp != game_config::team_rgb_range.end()) {
        return (gp->second);
    }

    return color_range({255, 0, 0}, {255, 255, 255}, {0, 0, 0}, {255, 0, 0});
}

color_t team::get_side_color(int side)
{
    return get_side_color_range(side).mid();
}

color_t team::get_minimap_color(int side)
{
    // Note: use mid() instead of rep() unless
    // high contrast is needed over a map or minimap!
    return get_side_color_range(side).rep();
}

std::string team::get_side_color_id(unsigned side)
{
    try {
        const unsigned index = side - 1;

        // If no gameboard (and by extension, team list) is available, use the default side color.
        if(!resources::gameboard) {
            return game_config::default_colors.at(index);
        }

        // Else, try to fetch the color from the side's config.
        const std::string& side_color = resources::gameboard->teams().at(index).color();

        if(!side_color.empty()) {
            return side_color;
        }

        // If the side color data was empty, fall back to the default color. This should only
        // happen if the side data hadn't been initialized yet, which is the case if this function
        // is being called to set up said side data. :P
        return game_config::default_colors.at(index);
    } catch(const std::out_of_range&) {
        // Side index was invalid! Coloring will fail!
        return "";
    }
}

const t_string team::get_side_color_name_for_UI(unsigned side)
{
    const std::string& color_id = team::get_side_color_id(side);
    const auto& rgb_name = game_config::team_rgb_name[color_id];
    if(rgb_name.empty())
        // TRANSLATORS: $color_id is the internal identifier of a side color, for example, 'lightred'.
        // Translate the quotation marks only; leave "color_id" untranslated, as it's a variable name.
        return VGETTEXT("“$color_id”", {{ "color_id", color_id }});
    else
        return rgb_name;
}

std::string team::get_side_color_id_from_config(const config& cfg)
{
    const config::attribute_value& c = cfg["color"];

    // If no color key or value was provided, use the given color for that side.
    // If outside a game context (ie, where a list of teams has been constructed),
    // this will just be the side's default color.
    if(c.blank() || c.empty()) {
        return get_side_color_id(cfg["side"].to_unsigned());
    }

    // Do the same as above for numeric color key values.
    if(unsigned side = c.to_unsigned()) {
        return get_side_color_id(side);
    }

    // Else, we should have a color id at this point. Return it.
    return c.str();
}

std::string team::get_side_highlight_pango(int side)
{
    return get_side_color_range(side).mid().to_hex_string();
}

void team::log_recruitable() const
{
    LOG_NG << "Adding recruitable units: \n";
    for(const std::string& recruit : info_.can_recruit) {
        LOG_NG << recruit << std::endl;
    }

    LOG_NG << "Added all recruitable units\n";
}

config team::to_config() const
{
    config cfg;
    config& result = cfg.add_child("side");
    write(result);
    return result;
}

std::string team::allied_human_teams() const
{
    std::vector<int> res;
    for(const team& t : resources::gameboard->teams()) {
        if(!t.is_enemy(this->side()) && t.is_human()) {
            res.push_back(t.side());
        }
    }

    return utils::join(res);
}