import java.util.Vector;
import java.io.*;

public class PictureProcessor{
	public static final boolean DEBUG = true; //this is for debugging the program efficiently and is used throughout
	private static String _path = "../originalframes/"; //this is the default directory that PictureProcessor will check for the frame extractions if none is specified as a command-line argument
	private static Vector<Picture> _pictures = new Vector<Picture>(); //vector of pictures that we can store our picture objects in for processing
	private static File _rootpath;
	private static File _resultDirectory;

	private boolean initialize(){
		try{ //try runs whatever is in this scope
			  File testFile = new File(_path); //File is a java object. The directory passed in from the user in the command-line is put into that object.
			  if(!testFile.exists()) //testFile is a particular File object with the path _path (either the default or from a command line argument, as per Test.java), .exists is a function within the File class that tests if that particular File object exists
				  throw new Exception("Directory '" + _path + "' does not exist."); //if the File object doesn't exist, give an error message
		  }catch(Exception ex){ //catches exception above
			  System.err.print(ex.getMessage()); //System makes kernel calls, System.err writes to the error log instead of standard output System.out
			  return false; //if there's an exception, initialization fails
		  }

		  _rootpath = new File(_path);//create a new File object called rootpath that contains the directory that the frame extractions are stored in
		  _resultDirectory = new File(_rootpath.getAbsolutePath() + "\\results"); //set up a results directory inside the frame extraction directory
		  try{
			  if(_rootpath.exists()){ //check to see if the rootpath above exists
				  if(!_resultDirectory.exists()) //if a folder called results does not exist within the frame extractions directory, create it
					  _resultDirectory.mkdir();
			  }else
				  throw new Exception("Directory '" + _rootpath.getAbsolutePath() + "' does not exist."); //if the frame extractions directory doesn't exist, throw an exception
		  }catch(Exception ex){
			  System.err.print(ex.getMessage());
			  return false; //if there's an exception, initialization fails
		  }

		  //add picture objects to a vector
		  for(File f : _rootpath.listFiles()){ //for each File f within the frame extractions directory, out of the list of files generated from listFiles() function
			  if(f.getName().endsWith(".bmp") || f.getName().endsWith(".jpg") || f.getName().endsWith(".png")){ //if file f's name ends with .bmp, .jpg, or .png
				  Picture tmpPic = new Picture(f.getAbsolutePath()); //create a new temporary picture object called tmpPic with path given by f.getAbsolutePath()
				  _pictures.add(tmpPic); //add tmpPic Picture object to the vector _pictures created above

				  if(DEBUG)
					  System.out.println("Added Picture object (" + f.getName() + ") to vector." ); //print that we added the picture to the vector
			  }
		  }

		  //process pictures(frames) in the vector, function given below
		  for(Picture pic : _pictures){
			  this.processPicture(pic);
		  }

		return true;
	}
	//throw an exception if PictureProcessor doesn't initialize
	public PictureProcessor() throws Exception{
		if(!this.initialize()){
			throw new Exception("PictureProcessor was not initialized properly.");
		}

	}

	public PictureProcessor( String _inputdirectory ) throws Exception{
		PictureProcessor._path = _inputdirectory;
		if(!this.initialize()){
			throw new Exception("PictureProcessor was not initialized properly.");
		}
	}


	public void processPicture(Picture pic){

	//to be written, see ForestFire.java

	}

}