language-menu-state.cpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "game/states/language-menu-state.hpp"
#include "game/states/options-menu-state.hpp"
#include "game/controls.hpp"
#include <engine/scene/text.hpp>
#include <engine/debug/log.hpp>
#include "game/fonts.hpp"
#include "game/menu.hpp"
#include "game/strings.hpp"
#include <engine/utility/hash/fnv1a.hpp>
#include <engine/resources/resource-manager.hpp>
#include <algorithm>
#include <cctype>
 
using namespace hash::literals;
 
language_menu_state::language_menu_state(::game& ctx):
    game_state(ctx)
{
    debug::log_trace("Entering language menu state...");
    
    // Load language manifest
    language_manifest = ctx.resource_manager->load<text_file>("languages.txt");
    if (!language_manifest)
    {
        throw std::runtime_error("Failed to load language manifest");
    }
    
    // Determine index of current language
    language_index = 0;
    for (std::size_t i = 0; i < language_manifest->lines.size(); ++i)
    {
        if (ctx.language_tag == language_manifest->lines[i])
        {
            language_index = i;
            break;
        }
    }
    
    // Construct menu item texts
    language_name_text = std::make_unique<scene::text>();
    language_value_text = std::make_unique<scene::text>();
    back_text = std::make_unique<scene::text>();
    
    // Build list of menu item texts
    ctx.menu_item_texts.push_back({language_name_text.get(), language_value_text.get()});
    ctx.menu_item_texts.push_back({back_text.get(), nullptr});
    
    // Set content of menu item texts
    update_text_content();
    
    // Init menu item index
    ::menu::init_menu_item_index(ctx, "language");
    
    ::menu::update_text_color(ctx);
    ::menu::update_text_font(ctx);
    ::menu::align_text(ctx);
    ::menu::add_text_to_ui(ctx);
    ::menu::setup_animations(ctx);
    
    auto change_language = [this, &ctx]()
    {
        const std::string& language_tag = this->language_manifest->lines[this->language_index];
        
        // Slugify language tag
        std::string language_slug = language_tag;
        std::transform
        (
            language_slug.begin(),
            language_slug.end(),
            language_slug.begin(),
            [](unsigned char c)
            {
                return std::tolower(c);
            }
        );
        
        // Load language strings
        ctx.string_map = ctx.resource_manager->load<i18n::string_map>(language_slug + ".str");
        
        // Update language settings
        ctx.language_tag = language_tag;
        (*ctx.settings)["language_tag"] = ctx.language_tag;
        
        // Log language change
        debug::log_info("Language tag: {}", ctx.language_tag);
        
        // Reload fonts
        debug::log_trace("Reloading fonts...");
        ::load_fonts(ctx);
        debug::log_trace("Reloaded fonts");
        
        // Update menus
        ::menu::update_text_font(ctx);
        this->update_text_content();
        ::menu::refresh_text(ctx);
        ::menu::align_text(ctx);
    };
    
    // Construct menu item callbacks
    auto next_language_callback = [this, &ctx, change_language]()
    {
        this->language_index = (this->language_index + 1) % this->language_manifest->lines.size();
        change_language();
    };
    auto previous_language_callback = [this, &ctx, change_language]()
    {
        if (this->language_index > 0)
        {
            --this->language_index;
        }
        else
        {
            this->language_index = this->language_manifest->lines.size() - 1;
        }
        
        change_language();
    };
    auto select_back_callback = [&ctx]()
    {
        // Disable menu controls
        ctx.function_queue.push(std::bind(::disable_menu_controls, std::ref(ctx)));
        
        ::menu::fade_out
        (
            ctx,
            [&ctx]()
            {
                // Queue change to options menu state
                ctx.function_queue.push
                (
                    [&ctx]()
                    {
                        ctx.state_machine.pop();
                        ctx.state_machine.emplace(std::make_unique<options_menu_state>(ctx));
                    }
                );
            }
        );
    };
    
    // Build list of menu select callbacks
    ctx.menu_select_callbacks.push_back(next_language_callback);
    ctx.menu_select_callbacks.push_back(select_back_callback);
    
    // Build list of menu left callbacks
    ctx.menu_left_callbacks.push_back(previous_language_callback);
    ctx.menu_left_callbacks.push_back(nullptr);
    
    // Build list of menu right callbacks
    ctx.menu_right_callbacks.push_back(next_language_callback);
    ctx.menu_right_callbacks.push_back(nullptr);
    
    // Set menu back callback
    ctx.menu_back_callback = select_back_callback;
    
    // Enable menu controls next frame
    ctx.function_queue.push(std::bind(::enable_menu_controls, std::ref(ctx)));
    
    // Fade in menu
    ::menu::fade_in(ctx, nullptr);
    
    debug::log_trace("Entered language menu state");
}
 
language_menu_state::~language_menu_state()
{
    debug::log_trace("Exiting language menu state...");
    
    // Destruct menu
    ::disable_menu_controls(ctx);
    ::menu::clear_callbacks(ctx);
    ::menu::delete_animations(ctx);
    ::menu::remove_text_from_ui(ctx);
    ::menu::delete_text(ctx);
    
    debug::log_trace("Exited language menu state");
}
 
void language_menu_state::update_text_content()
{
    auto [language_name, language_value] = ctx.menu_item_texts[0];
    auto [back_name, back_value] = ctx.menu_item_texts[1];
    
    language_name->set_content(get_string(ctx, "language_menu_language"));
    language_value->set_content(get_string(ctx, "language_name_native"));
    back_name->set_content(get_string(ctx, "back"));
}