/*
   Copyright (C) 2009 - 2015 by Yurii Chernyi <terraninfo@terraninfo.net>
   Part of the Battle for Wesnoth Project http://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.
*/

/**
 * Managing the AIs configuration - headers
 * @file
 * */

#ifndef AI_CONFIGURATION_HPP_INCLUDED
#define AI_CONFIGURATION_HPP_INCLUDED

#include "../config.hpp"
#include "game_info.hpp"

namespace ai {

/**
 * AI parameters. class to deal with AI parameters. It is an implementation detail.
 * We need implementation which will allow easy access to all the parameters
 * which match any of the pre-defined set of filters
 * such as 'select from ai_parameters where time_of_day=first watch'
 * or 'select from ai_parameters where active(current_game_state)=true'
 * it should be noted that there may be several variables with a same name but
 * different filters. the proposed rules, in general, are:
 * 1) scenario_parameter_in_SIDE_section > scenario_parameter_in_AI_section > default_value
 * then, if (1) is equal:
 * 2) use scenario-creator supplied priority ( 'not set' = 0)
 * then, if (2) is equal:
 * 3) more restricted parameter > less restricted parameter
 * then, if (3) is equal:
 * use any and loudly complain.
 */

struct description {
public:
	description()
		: text()
		, id()
		, cfg()
	{
	}

	t_string text;
	std::string id;
	config cfg;
};

class configuration {
public:

	/**
	 * Init the parameters of ai configuration parser
	 * @param game_config game config
	 */
	static void init(const config &game_config);
	static void add_era_ai_from_config(const config &game_config);
	static void add_mod_ai_from_config(config::const_child_itors configs);


	/**
	 * get default AI parameters
	 * @return default AI parameters
	 */
	static const config& get_default_ai_parameters();


	/**
	 * Return the config for a specified ai
	 */
	static const config& get_ai_config_for(const std::string &id);


	/**
	 * Returns a list of available AIs.
	 * @return the list of available AIs.
	 */
	static std::vector<description*> get_available_ais();


	/**
	 * get side config from file
	 * @param file the file name to open. follows usual WML convention.
	 * @param[out] cfg the config to be written from file.
	 * @return was all ok?
	 * @retval true success
	 * @retval false failure
	 */
	static bool get_side_config_from_file( const std::string& file, config& cfg );



	/**
	 * change a bunch of old aspect configs into a new-style [ai] snippet
	 * @param[in] ai_parameters - old [ai] snippets
	 * @param[out] parsed_cfg - new-style [ai] snippet
	 */
	static void upgrade_aspect_configs_from_1_07_02_to_1_07_03(side_number side, const config::const_child_itors &ai_parameters, config &parsed_cfg);


	/**
	 * @param[in] cfg the config to be read
	 * @param[out] parsed_cfg parsed config
	 * @return was all ok?
	 * @retval true success
	 * @retval false failure
	 */
	static bool parse_side_config(side_number side, const config& cfg, config &parsed_cfg);


private:
	/**
	 * Upgrade aspect config from version 1.7.2 to version 1.7.3
	 * @param[in] cfg the config to be read
	 * @param[out] parsed_cfg parsed config
	 * @param[in] id id of the aspect to work on
	 * @param aspect_was_attribute aspect was an attribute, not a [child]
	 * @return was all ok?
	 * @retval true success
	 * @retval false failure
	 */
	static bool upgrade_aspect_config_from_1_07_02_to_1_07_03(side_number side, const config& cfg, config& parsed_cfg, const std::string &id, bool aspect_was_attribute = true);


	/**
	 * Upgrade protect goal config from version 1.7.2 to version 1.7.3
	 * @param side side number
	 * @param[in] protect_cfg the config to be read
	 * @param[out] parsed_cfg parsed config, to which a new goal is to be added
	 * @param[in] add_filter should [filter] be added to criteria or not
	 */
	static void upgrade_protect_goal_config_from_1_07_02_to_1_07_03(side_number side, const config &protect_cfg, config &parsed_cfg, bool add_filter);

	/**
	 * Upgrade side config from version 1.7.2 to version 1.7.3
	 * @param[in] cfg the config to be read
	 * @return was all ok?
	 * @retval true success, cfg is guaranteed to be valid
	 * @retval false failure
	 */
	static bool upgrade_side_config_from_1_07_02_to_1_07_03(side_number side, config &cfg);

	typedef std::map<std::string, description> description_map;
	static description_map ai_configurations_;
	static description_map era_ai_configurations_;
	static description_map mod_ai_configurations_;
	static config default_config_;

};

} //end of namespace ai
#endif