/*
   Copyright (C) 2008 - 2018 by Mark de Wever <koraq@xs4all.nl>
   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/gui.hpp"

#include "config_cache.hpp"
#include "filesystem.hpp"
#include "gettext.hpp"
#include "gui/core/log.hpp"
#include "gui/core/gui_definition.hpp"
#include "gui/widgets/settings.hpp"
#include "preferences/general.hpp"
#include "serialization/parser.hpp"
#include "serialization/preprocessor.hpp"
#include "serialization/schema_validator.hpp"
#include "wml_exception.hpp"

namespace gui2
{
static bool initialized = false;

void init()
{
	if(initialized) {
		return;
	}

	LOG_GUI_G << "Initializing UI subststem." << std::endl;

	// Save current screen size.
	settings::update_screen_size_variables();

	//
	// Read and validate the WML files.
	//
	config cfg;
	try {
		schema_validation::schema_validator validator(filesystem::get_wml_location("gui/schema.cfg"));

		preproc_map preproc(game_config::config_cache::instance().get_preproc_map());
		filesystem::scoped_istream stream = preprocess_file(filesystem::get_wml_location("gui/_main.cfg"), &preproc);

		read(cfg, *stream, &validator);
	} catch(const config::error& e) {
		ERR_GUI_P << e.what() << '\n';
		ERR_GUI_P << "Setting: could not read file 'data/gui/_main.cfg'." << std::endl;
	} catch(const abstract_validator::error& e) {
		ERR_GUI_P << "Setting: could not read file 'data/gui/schema.cfg'." << std::endl;
		ERR_GUI_P << e.message;
	}

	//
	// Parse GUI definitions.
	//
	const std::string& current_theme = preferences::gui_theme();

	for(const config& g : cfg.child_range("gui")) {
		const std::string id = g["id"];

		auto iter = guis.emplace(id, gui_definition(g)).first;

		if(id == "default") {
			default_gui = iter;
		}

		if(!current_theme.empty() && id == current_theme) {
			current_gui = iter;
		}
	}

	VALIDATE(default_gui != guis.end(), _("No default gui defined."));

	if(current_theme.empty()) {
		current_gui = default_gui;
	} else if(current_gui == guis.end()) {
		ERR_GUI_P << "Missing [gui] definition for '" << current_theme << "'\n";
		current_gui = default_gui;
	}

	current_gui->second.activate();

	initialized = true;
}

} // namespace gui2
