/******************************** LICENSE ********************************

 Copyright 2007 European Centre for Medium-Range Weather Forecasts (ECMWF)

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at 

    http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.

 ******************************** LICENSE ********************************/

/*! \file GeoPointsDecoder.cc
    \brief Implementation of the Template class GeoPointsDecoder.
    
    Magics Team - ECMWF 2005
    
    Started: Mon 12-Dec-2005
    
    Changes:
    
*/



#include "GeoPointsDecoder.h"
#include "SciMethods.h"

using namespace magics;

GeoPointsDecoder::GeoPointsDecoder()
{
}


GeoPointsDecoder::~GeoPointsDecoder()
{
}

/*!
 Class information are given to the output-stream.
*/		
void GeoPointsDecoder::print(ostream& out)  const
{
	out << "GeoPointsDecoder[";
	out << "]";
}

void GeoPointsDecoder::add(const Transformation& transformation, UserPoint& geo)
{
    std::stack<UserPoint>   duplicates;
	transformation.wraparound(geo, duplicates);
	while (duplicates.empty() == false) {
	    push_back(new UserPoint(duplicates.top()));
	    duplicates.pop();
	    stats_["value"].push_back(geo.value());
	 }   	
}

void GeoPointsDecoder::add(const Transformation& transformation, CustomisedPoint& point)
{
	UserPoint geo(point.longitude(), point.latitude());
	std::stack<UserPoint>   duplicates;
	transformation.wraparound(geo, duplicates);

	while (duplicates.empty() == false) {
		UserPoint p = duplicates.top();
		push_back(new UserPoint(p));
		CustomisedPoint*  cp = new CustomisedPoint(p.x(), p.y(), point.identifier());

		for ( CustomisedPoint::iterator key = point.begin(); key != point.end(); ++key)
			cp->insert(make_pair(key->first, key->second));
		customisedPoints_.push_back(cp);
		duplicates.pop();
		
		//Compute speed for stats and histogram
		map<string,double>::const_iterator itX=point.find("x_component");
		map<string,double>::const_iterator itY=point.find("y_component");
		if(itX != point.end() && itY != point.end())
		{	
			double speed=sqrt((itX->second)*(itX->second)+(itY->second)*(itY->second));
			back()->value(speed);
		  	stats_["value"].push_back(speed);
		}	
	}

}

void GeoPointsDecoder::yxdtlv2(const string& line, const Transformation& transformation)
{
	std::istringstream in(line);
	double lat, lon, date, time, level, value;
	in >> lat >> lon >> level >> date >> time >>  value;
	UserPoint geo(lon, lat, value, value == missing_);
	add(transformation, geo);
}

void GeoPointsDecoder::xyv2(const string& line, const Transformation& transformation)
{
	std::istringstream in(line);
	double lat, lon, value;
	in >> lon >> lat >> value;
	UserPoint geo(lon, lat, value, value == missing_);
	add(transformation, geo);
	
}
void GeoPointsDecoder::lluv(const string& line, const Transformation& transformation)
{
	std::istringstream in(line);
	double lat, lon, height, date, time, u, v;
	in >> lat >> lon >> height >> date >> time >> u >> v;
	CustomisedPoint geo(lon, lat, "lluv");
	geo["x_component"] = u;
	geo["y_component"] = v;
	if ( u == missing_ || v == missing_ )
		geo.missing(true);
	add(transformation, geo);

}
void GeoPointsDecoder::polar(const string& line, const Transformation& transformation)
{
	std::istringstream in(line);
	double lat, lon, height, date, time, speed, direction;
	in >> lat >> lon >> height >> date >> time >> speed >> direction;

	CustomisedPoint geo(lon, lat, "polar");

	if ( speed == missing_ || direction == missing_ )
			geo.missing(true);

	else {
		double angle = (90 - (direction))*(PI/180.);
		geo["x_component"] = speed * -cos(angle);
		geo["y_component"] = speed * -sin(angle) ;
	}



	add(transformation, geo);

}
void GeoPointsDecoder::yxdtlv1(const string& line)
{
	std::istringstream in(line);
	double lat, lon, date, time, level, value;
	in >> lat >> lon >> level >> date >> time >>  value;

	push_back(new UserPoint(lon, lat, value, value == missing_));
}

void GeoPointsDecoder::xyv1(const string& line)
{
	std::istringstream in(line);
	double lat, lon, value;
	in >> lon >> lat >> value;
	push_back(new UserPoint(lon, lat, value, value == missing_));
	
}
void GeoPointsDecoder::decode(const Transformation& transformation)
{
	if ( formats_.empty() ) {
		formats_["XYV"] = &GeoPointsDecoder::xyv2;
		formats_["LLV"] = &GeoPointsDecoder::xyv2;
		formats_["XY_VECTOR"] = &GeoPointsDecoder::lluv;
		formats_["POLAR_VECTOR"] = &GeoPointsDecoder::polar;
	}
	
	GeoPointsDecoder::Decode method = &GeoPointsDecoder::yxdtlv2;
	
	if ( !empty() ) return;
	char line[1024];
	try {
		
		ifstream in(path_.c_str());
		while( in.getline( line, sizeof(line) ) ) {
		      if( strncmp( line, "#DATA", 5 ) == 0 ) 
		    	  break;
		      if( strncmp( line, "#FORMAT ", 8 ) == 0 ) {
		    	  const char* fp = line+7;
		    	  while( fp && *fp == ' ' )
		    		  	++fp;
		    	  string format(fp);
		    	  map<string, GeoPointsDecoder::Decode>::iterator m = formats_.find(format);
		    	  method = ( m != formats_.end() ) ? m->second : &GeoPointsDecoder::yxdtlv2;
		      }
		    }

		  while( in.getline( line, sizeof(line) ) ) {
		      if( (*line != '#') && (strlen( line ) > 4) ) {
		    	  (this->*method)(line, transformation);
		      }
		    }

		//computeStats();

		in.close();
	}
	catch (...)
	{
		MagLog::error() << "Geopoints file : can not open " << path_ << endl;
	}
	 
	 
}

void GeoPointsDecoder::customisedPoints(const Transformation& transformation, const std::set<string>&, CustomisedPointsList& list)
{

	customisedPoints_.clear();

	decode(transformation);

	for ( vector<CustomisedPoint*>::iterator point = customisedPoints_.begin(); point != customisedPoints_.end(); ++point)
		list.push_back(*point);



}
void GeoPointsDecoder::decode()
{
	if ( simple_formats_.empty() ) {
		simple_formats_["XYV"] = &GeoPointsDecoder::xyv1;
		simple_formats_["LLV"] = &GeoPointsDecoder::xyv1;
	}
	
	GeoPointsDecoder::SimpleDecode method = &GeoPointsDecoder::yxdtlv1;
	
	if ( !empty() ) return;
	char line[1024];
	try {
		
		ifstream in(path_.c_str());
		while( in.getline( line, sizeof(line) ) ) {
		      if( strncmp( line, "#DATA", 5 ) == 0 ) 
		    	  break;
		      if( strncmp( line, "#FORMAT ", 8 ) == 0 ) {
		    	  const char* fp = line+7;
		    	  while( fp && *fp == ' ' )
		    		  	++fp;
		    	  string format(fp);
		    	  map<string, GeoPointsDecoder::SimpleDecode>::iterator m = simple_formats_.find(format);
		    	  method = ( m != simple_formats_.end() ) ? m->second : &GeoPointsDecoder::yxdtlv1;
		      }
		    }

		  while( in.getline( line, sizeof(line) ) ) {
		      if( (*line != '#') && (strlen( line ) > 4) ) {
		    	  (this->*method)(line);
		      }
		    }

		//computeStats();

		in.close();
	}
	catch (...)
	{
		MagLog::error() << "Geopoints file : can not open " << path_ << endl;
	}
	 
	 
}

void GeoPointsDecoder::initInfo()
{
	setInfo("_datatype","GEOPOINTS");
	setInfo("path",path_);
	setInfo("MV_Format","GEOPOINTS");

}

void GeoPointsDecoder::visit(MetaDataCollector& mdc)
{	
	for(map<string, string>::iterator key = mdc.begin(); key != mdc.end(); ++key )
	{	    
		if(information_.find(key->first) == information_.end() &&
		  mdc.attribute(key->first).group() == MetaDataAttribute::StatsGroup)
		{
			  computeStats();
			  break;
		}
	}
	
	MetviewIcon::visit(mdc);
}  

void GeoPointsDecoder::visit(ValuesCollector& points)
{
	points.setCollected(true);
  	 
	if(points.size() <=0 || size() == 0)
	  	return;
	

	for (ValuesCollector::iterator point =  points.begin(); point != points.end(); ++point)
	{
	  	double lat=(*point).y();
	  	double lon=(*point).x();
		
		vector<int> idxV;		
		for(int i=0; i < size(); i++)
		{
			if(fabs(at(i)->y()-lat) < points.searchRadiusY() &&
			   fabs(at(i)->x()-lon) <  points.searchRadiusX())
			{
			  	idxV.push_back(i);
			}
		}
		
		if(idxV.size() ==0)
			continue;  
		
		double dist=10000000.;
		int minIdx=-1;
		
		//MagLog::debug() << "odb collect idxV : " << lat << " " << lon << " " << idxV.size() << endl;
 		
		for(int i=0; i < idxV.size(); i++)
		{  			
		  	int idx=idxV[i];
			double d=magics::geoDistanceInKm(at(idx)->y(),at(idx)->x(),lat,lon);
			
			if(d < dist)
			{
			  	minIdx=idx;
				dist=d;
			}			
		}	
		if(minIdx>=0)  
			(*point).push_back(new ValuesCollectorData(at(minIdx)->x(),
							       at(minIdx)->y(),
							       at(minIdx)->value(),
							       dist));					     			
	}	  
}
