/*
 *  ExpressionFilterWrapper.h
 *  CERTFramework
 *
 *  Created by Andrew Salamon on 7/24/06.
 *  Copyright 2006 __MyCompanyName__. All rights reserved.
 *
 */

#include <vector>
#include <string>
#include <map>

class ExpressionFilter;

/** Creates and provides easy use of filters for converting raw expression (AU or smile) data into probabilities.
 * A list of AU numbers (labels) is passed to the constructor along with an optional directory to find data files.
 * If no directory is given then the current working directory is used.
 * For each AU three different files are needed to build a filter. Examples for AU 1 are:
 *    -# AU_1_absent_likelihoods.txt
 *    -# AU_1_present_likelihoods.txt
 *    -# AU_1_noface_likelihoods.txt

 * For every frame of video or image, call the filterValue method with the AU number (label), the value and a flag telling whether or
 * or not a face was found. The probability (0.0 - 1.0) will be returned.

 * If a particular filter wasn't created (file wasn't found, etc) the original value is returned.

 * There is currently no way to find out if any particular AU is being filtered.

 * The smile detector is using 101 as its AU number (label).
 */
class ExpressionFilterWrapper
{	
public:
	ExpressionFilterWrapper( const std::vector<int> aus, const std::string &dir = "" );
	~ExpressionFilterWrapper();
	
	double filterValue( int AU, double value, bool faceFound );
	
	typedef std::map<int, ExpressionFilter * > filterMapType;

private:
	filterMapType filters;
};