package com.marcoa.utility;

import javax.servlet.http.HttpServletRequest;

import java.io.File;
import java.io.FilenameFilter;

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

public class BannerChooser {

	@SuppressWarnings("unchecked")
		
	/**
	 * Returns a random banner file name
	 */
	public static String getImg(String directory) {
	
	    //Create Random object
		Random generator = new Random();
		
		//Create an array to hold image file names
		String[] bannerFiles = getFiles(directory);
		
		//Get a random index number
		int randomIndex = generator.nextInt(bannerFiles.length);
		
		//Return the element at the random index
		return bannerFiles[randomIndex];
		
	}
	
	/**
	 * Returns the html path for a random banner or filler banner
	 */
	public static String imagePath() {
	
	   String imgFile = "";
	   String path = "";
	   
	   boolean bannerDir = hasFiles();
	
	   //check that there are banner files in the directory
	   if( bannerDir ) {
	   
	      //if there are then get a random image from BANNER_LOC
	      imgFile = getImg(MagicNumber.BANNER_LOC);
		  
	      //append the path to banner location
	      path = "/ads/dog-jpg/banners/" + imgFile;
	   
	   } else {
	      //if there are no images in the directory 
	      //get a random image from the filler banner directory
		  imgFile = getImg(MagicNumber.FILLERBANNER_LOC);
		  
	      //append the path to the filler banners
		  path = "/images/web-ads/banners/" + imgFile;
		  
	   }
	   return path;
	}
	
	/**
	 * Returns the correct html link path for the banner ad
	 * returned by imagePath()
	 */
	public static String linkPath(String imgPath) {
	
	   String path = "";
	   String imgFile = "";
	   String contractNum = "";
		
	   StringTokenizer st = new StringTokenizer(imgPath, "/");
	   int tokenCount = st.countTokens();
	   
	   String[] tokens = new String[tokenCount];
	   
	   int i = 0;
	   
	   while( st.hasMoreTokens() ) {
	      tokens[i] = st.nextToken();
		  i++;
	   }
	
	   //Get the file name from imgPath
	   imgFile = tokens[ tokenCount-1 ];
	
	   boolean bannerDir = hasFiles(); 
	   
	   //If there are paid banners then the imgFile is a contract number
	   if( bannerDir ) {
		  
	      //Get rid of extention, keep only the contract number
		  contractNum = imgFile.substring(0, (imgFile.length() - 4) );
		  
	      //Append contract number to DisplayBannerAd.do
		  path = "DisplayBannerAd.do?id=" + contractNum;

	   } else {
	      //Else imgFile is the file name of a filler ad

	      //Append file name to /images/web-ads/fullAds/
		  path = "/images/web-ads/fullAds/" + imgFile;
		  
	      
	   }
	   return path;
	}
	
	/**
	 * Checks to make sure there are files in the banner directory
	 */
	public static boolean hasFiles() {
	   String[] bannerFiles = getFiles(MagicNumber.BANNER_LOC);
	   
	   if ( bannerFiles.length != 0 ) {
	      return true;
	   } else {
	      return false;
	   }
	}

	/**
	 * Takes in a directory and looks for *.jpg files and returns a list of
	 * them.
	 * 
	 * @param directory
	 *            The directory to be looked through for files.
	 * @return An array of filenames as Strings.
	 */

	public static String[] getFiles(String directory) {
		/* Open the directory */
		File dir = new File(directory);

		/* get a list of all filenames that are children of the above directory */
		String[] children = dir.list();

		// It is also possible to filter the list of returned files.
		// This example only returns files that end with '.jpg'.
		FilenameFilter filter = new FilenameFilter() {
			public boolean accept(File dir, String name) {
				return name.endsWith(".jpg");
			}
		};
		children = dir.list(filter);

		// The list of files can also be retrieved as File objects (Commented
		// out at the moment, because it isn't needed)
		/* File[] files = dir.listFiles(filter); */

		return children;
	}

}