/*
   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.
*/

/**
 * Composite AI with turn sequence which is a vector of stages
 * @file
 */

#include "ai.hpp"
#include "aspect.hpp"
#include "engine.hpp"
#include "goal.hpp"
#include "property_handler.hpp"
#include "stage.hpp"
#include "../manager.hpp"
#include "../../actions/attack.hpp"
#include "../../log.hpp"

#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <boost/foreach.hpp>

namespace ai {

static lg::log_domain log_ai_composite("ai/composite");
#define DBG_AI_COMPOSITE LOG_STREAM(debug, log_ai_composite)
#define LOG_AI_COMPOSITE LOG_STREAM(info, log_ai_composite)
#define ERR_AI_COMPOSITE LOG_STREAM(err, log_ai_composite)

// =======================================================================
// COMPOSITE AI
// =======================================================================
std::string ai_composite::describe_self() const
{
	return "[composite_ai]";
}

ai_composite::ai_composite( default_ai_context &context, const config &cfg)
	: cfg_(cfg),stages_(),recursion_counter_(context.get_recursion_count())
{
	init_default_ai_context_proxy(context);
}

void ai_composite::on_create()
{
	LOG_AI_COMPOSITE << "side "<< get_side() << " : "<<" created AI with id=["<<
		cfg_["id"]<<"]"<<std::endl;

	// init the composite ai stages
	BOOST_FOREACH(const config &cfg_element, cfg_.child_range("stage")){
		add_stage(cfg_element);
	}

	config cfg;
	cfg["engine"] = "fai";
	engine_ptr e_ptr = get_engine_by_cfg(cfg);
	if (e_ptr) {
		e_ptr->set_ai_context(this);
	}

	boost::function2<void, std::vector<engine_ptr>&, const config&> factory_engines =
		boost::bind(&ai::ai_composite::create_engine,*this,_1,_2);

	boost::function2<void, std::vector<goal_ptr>&, const config&> factory_goals =
		boost::bind(&ai::ai_composite::create_goal,*this,_1,_2);

	boost::function2<void, std::vector<stage_ptr>&, const config&> factory_stages =
		boost::bind(&ai::ai_composite::create_stage,*this,_1,_2);

	register_vector_property(property_handlers(),"engine",get_engines(), factory_engines);
	register_vector_property(property_handlers(),"goal",get_goals(), factory_goals);
	register_vector_property(property_handlers(),"stage",stages_, factory_stages);
	register_aspect_property(property_handlers(),"aspect",get_aspects());

}


void ai_composite::create_stage(std::vector<stage_ptr> &stages, const config &cfg)
{
	engine::parse_stage_from_config(*this,cfg,std::back_inserter(stages));
}


void ai_composite::create_goal(std::vector<goal_ptr> &goals, const config &cfg)
{
	engine::parse_goal_from_config(*this,cfg,std::back_inserter(goals));
}


void ai_composite::create_engine(std::vector<engine_ptr> &engines, const config &cfg)
{
	engine::parse_engine_from_config(*this,cfg,std::back_inserter(engines));
}

ai_composite::~ai_composite()
{
}


bool ai_composite::add_stage(const config &cfg)
{
	std::vector< stage_ptr > stages;
	create_stage(stages,cfg);
	int j=0;
	BOOST_FOREACH(stage_ptr b, stages ){
		stages_.push_back(b);
		j++;
	}
	return (j>0);
}


bool ai_composite::add_goal(const config &cfg)
{
	std::vector< goal_ptr > goals;
	create_goal(goals,cfg);
	int j=0;
	BOOST_FOREACH(goal_ptr b, goals ){
		get_goals().push_back(b);
		j++;
	}
	return (j>0);
}


void ai_composite::play_turn(){
	BOOST_FOREACH(stage_ptr &s, stages_){
		s->play_stage();
	}
}


std::string ai_composite::get_id() const
{
	return cfg_["id"];
}



std::string ai_composite::get_name() const
{
	return cfg_["name"];
}


std::string ai_composite::get_engine() const
{
	return cfg_["engine"];
}


std::string ai_composite::evaluate(const std::string& str)
{
	config cfg;
	cfg["engine"] = "fai";///@todo 1.9 : consider allowing other engines to evaluate
	engine_ptr e_ptr = get_engine_by_cfg(cfg);
	if (!e_ptr) {
		return interface::evaluate(str);
	}
	return e_ptr->evaluate(str);
}


void ai_composite::new_turn()
{
	///@todo 1.9 replace with event system
	recalculate_move_maps();
	invalidate_defensive_position_cache();
	invalidate_keeps_cache();
	clear_additional_targets();
	unit_stats_cache().clear();
}


int ai_composite::get_recursion_count() const
{
	return recursion_counter_.get_count();
}

void ai_composite::switch_side(side_number side)
{
	set_side(side);
}

ai_context& ai_composite::get_ai_context()
{
	return *this;
}


config ai_composite::to_config() const
{
	config cfg;

	//serialize the composite ai stages
	BOOST_FOREACH(const stage_ptr &s, stages_){
		cfg.add_child("stage",s->to_config());
	}

	return cfg;
}

} //end of namespace ai