help.cpp

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/*
    Copyright (C) 2003 - 2025
    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
 * Routines for showing the help-dialog.
 */
 
#define GETTEXT_DOMAIN "wesnoth-help"
 
#include "help/help.hpp"
 
#include "config.hpp"                   // for config, etc
#include "events.hpp"                   // for draw, pump, etc
#include "font/constants.hpp"           // for relative_size
#include "preferences/preferences.hpp"
#include "game_config_manager.hpp"
#include "gettext.hpp"                  // for _
#include "gui/dialogs/help_browser.hpp"
#include "gui/widgets/settings.hpp"
#include "help/help_impl.hpp"           // for hidden_symbol, toplevel, etc
#include "key.hpp"                      // for CKey
#include "log.hpp"                      // for LOG_STREAM, log_domain
#include "terrain/terrain.hpp"          // for terrain_type
#include "units/unit.hpp"               // for unit
#include "units/types.hpp"              // for unit_type, unit_type_data, etc
#include "video.hpp"                    // for game_canvas_size
#include "widgets/button.hpp"           // for button
 
#include <cassert>                      // for assert
#include <algorithm>                    // for min
#include <vector>                       // for vector, vector<>::iterator
 
 
static lg::log_domain log_display("display");
#define WRN_DP LOG_STREAM(warn, log_display)
 
static lg::log_domain log_help("help");
#define ERR_HELP LOG_STREAM(err, log_help)
 
namespace help {
/**
 * Open a help dialog using a specified toplevel.
 *
 * This would allow for complete customization of the contents, although not in a
 * very easy way. It's used as the internal implementation of the other help*
 * functions.
 *
 *@pre The help_manager must already exist; this is different to the functions
 * declared in help.hpp, which is why this one's declaration is in the .cpp
 * file. Because this takes a section as an argument, it wouldn't make sense
 * for it to call ensure_cache_lifecycle() internally - if the help_manager
 * doesn't already exist, that would likely destroy the referenced object at
 * the point that this function exited.
 */
void show_with_toplevel(const section &toplevel, const std::string& show_topic="");
 
 
void show_unit_description(const unit &u)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    help::show_unit_description(u.type());
}
 
void show_terrain_description(const terrain_type &t)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    help::show_terrain_help(t.id(), t.hide_help());
}
 
void show_unit_description(const unit_type &t)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    std::string var_id = t.get_cfg()["variation_id"].str();
    if (var_id.empty())
        var_id = t.get_cfg()["variation_name"].str();
    bool hide_help = t.hide_help();
    bool use_variation = false;
    if (!var_id.empty()) {
        const unit_type *parent = unit_types.find(t.id());
        assert(parent);
        if (hide_help) {
            hide_help = parent->hide_help();
        } else {
            use_variation = true;
        }
    }
 
    if (use_variation)
        help::show_variation_help(t.id(), var_id, hide_help);
    else
        help::show_unit_help(t.id(), t.show_variations_in_help(), hide_help);
}
 
help_manager::help_manager(const game_config_view *cfg)
{
    assert(!game_cfg);
    assert(cfg);
    // This is a global rawpointer in the help:: namespace.
    game_cfg = cfg;
}
 
std::unique_ptr<help_manager> ensure_cache_lifecycle()
{
    // The internals of help_manager are that this global raw pointer is
    // non-null if and only if an instance of help_manager already exists.
    if(game_cfg)
        return nullptr;
    return std::make_unique<help_manager>(&game_config_manager::get()->game_config());
}
 
help_manager::~help_manager()
{
    game_cfg = nullptr;
    default_toplevel.clear();
    hidden_sections.clear();
    // These last numbers must be reset so that the content is regenerated.
    // Upon next start.
    last_num_encountered_units = -1;
    last_num_encountered_terrains = -1;
}
 
/**
 * Open the help browser, show topic with id show_topic.
 *
 * If show_topic is the empty string, the default topic will be shown.
 */
void show_help(const std::string& show_topic)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    show_with_toplevel(default_toplevel, show_topic);
}
 
/**
 * Open the help browser, show unit with id unit_id.
 *
 * If show_topic is the empty string, the default topic will be shown.
 */
void show_unit_help(const std::string& show_topic, bool has_variations, bool hidden)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    show_with_toplevel(default_toplevel,
              hidden_symbol(hidden) + (has_variations ? ".." : "") + unit_prefix + show_topic);
}
 
/**
 * Open the help browser, show terrain with id terrain_id.
 *
 * If show_topic is the empty string, the default topic will be shown.
 */
void show_terrain_help(const std::string& show_topic, bool hidden)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    show_with_toplevel(default_toplevel, hidden_symbol(hidden) + terrain_prefix + show_topic);
}
 
/**
 * Open the help browser, show the variation of the unit matching.
 */
void show_variation_help(const std::string& unit, const std::string &variation, bool hidden)
{
    auto cache_lifecycle = ensure_cache_lifecycle();
    show_with_toplevel(default_toplevel, hidden_symbol(hidden) + variation_prefix + unit + "_" + variation);
}
 
void init_help() {
    // Find all unit_types that have not been constructed yet and fill in the information
    // needed to create the help topics
    unit_types.build_all(unit_type::HELP_INDEXED);
 
    auto& enc_units = prefs::get().encountered_units();
    auto& enc_terrains = prefs::get().encountered_terrains();
    if(enc_units.size() != size_t(last_num_encountered_units) ||
        enc_terrains.size() != size_t(last_num_encountered_terrains) ||
        last_debug_state != game_config::debug ||
        last_num_encountered_units < 0) {
        // More units or terrains encountered, update the contents.
        last_num_encountered_units = enc_units.size();
        last_num_encountered_terrains = enc_terrains.size();
        last_debug_state = game_config::debug;
        generate_contents();
    }
}
 
/**
 * Open a help dialog using a toplevel other than the default.
 *
 * This allows for complete customization of the contents, although not in a
 * very easy way.
 */
void show_with_toplevel(const section &toplevel_sec, const std::string& show_topic)
{
    gui2::dialogs::help_browser::display(toplevel_sec, show_topic);
}
 
} // End namespace help.