package recursive;

import java.io.File;

public class Recursive {
	
	public enum Test {
		FILE,
		FIBONACCI
	}
	
	public Recursive(Test t)
	{
		switch(t)
		{
		case FILE:
			runFileTest();
			break;
		case FIBONACCI:
			runFibonacciTest();
			break;
		}
	}

	private void runFibonacciTest() {
		System.err.println("Running recursive fibonacci test...");
		System.out.println(calcFibonacci(20));
	}

	public int calcFibonacci(int n)  {
	    if(n == 0)
	        return 0;
	    else if(n == 1)
	    	return 1;
	   else
	      return calcFibonacci(n - 1) + calcFibonacci(n - 2);
	}

	private void runFileTest() {
		System.err.println("Running recursive file test...");
		System.out.println(viewFiles("."));
	}
	
	private String viewFiles(String path)
	{
		String str = "\n";
		File folder = new File(path);
		File[] files = folder.listFiles();
		
		for(File f : files)
		{
			if(f.isDirectory())
				str += "\n" + f.getName() + "\t" + viewFiles(f.getAbsolutePath());
			else
				str += "\n\t" + f.getName();
		}
		return str;
	}
}