/*
 * Created on Mar 23, 2006
 *
 * This class converts ISBN-10s to ISBN-13s
 */
package book2price.util;

import book2price.model.data.ISBNResults;

/**
 * This class converts ISBN-10s to ISBN-13s
 * @author BooksPrice.com
 * You may use the code in any commercial or non commercial use free of any charge.
 * The program is provided 'AS IS' with no guarntee of any kind.
 * Please visit us to compare book prices at: www.BooksPrice.com
 */
public class ISBNConvertUtil  {
	
	
	/**
	 * Converts an EAN or an ISBN 13 to ISBN 10
	 * @param isbn13OrEAN
	 * @return String the ISBN 10
	 */
	public static String convertFromIsbn13ToIsbn10(String isbn13OrEAN){
		String isbn10 = "";
		if (isbn13OrEAN==null){
			throw new IllegalArgumentException("Not valid ISBN");
		}
		isbn13OrEAN = isbn13OrEAN.replaceAll("-","");
		if (isbn13OrEAN.length()!=13){
			throw new IllegalArgumentException("Not valid ISBN");
		}
		isbn10 = isbn13OrEAN.substring(3,isbn13OrEAN.length()-1);
		char [] allChars = isbn10.toCharArray();
		
		int sum = 0;
		for (int i = 0; i < allChars.length; i++) {
			char current = allChars[i];
			int currentNumber = Character.getNumericValue(current);
			if(currentNumber<0||currentNumber>9){
				throw new IllegalArgumentException("Not valid ISBN");
			}
			sum += currentNumber*(10-i);
		}
		int modulu = sum%11;
		int checkDigit = 11 - modulu;

		//if the checkDigit is 10 should be x
		if (checkDigit==10){
			isbn10 += 'X';
		}
		else if(checkDigit==11){
			isbn10 += '0';
		}
		else{
			isbn10 += checkDigit;
		}
		return isbn10;
	}
	
	/**
	 * Converts an isbn String of 10 to an EAN
	 * @param isbn10 The isbn 10
	 * @return String the isbn 13
	 */
	public static String convertToEAN(String isbn10){
		String isbn13 = "";
		String prefix = "978";
		if(isbn10==null){
			throw new IllegalArgumentException("Not valid ISBN");
		}
		
		isbn10 = isbn10.replaceAll("-","");
		
		if(isbn10.length()<9 || isbn10.length()>10){
			throw new IllegalArgumentException("Not valid ISBN");
		}
		//remove the last digit
		if(isbn10.length()==10){
			isbn10 = isbn10.substring(0,9);
		}
		
		isbn13 = prefix + isbn10;
		
		char [] allChars = isbn13.toCharArray();
		
		int sum = 0;
		for (int i = 0; i < allChars.length; i++) {
			char current = allChars[i];
			int currentNumber = Character.getNumericValue(current);
			if(currentNumber<0||currentNumber>9){
				throw new IllegalArgumentException("Not valid ISBN");
			}
			
			if(i % 2 == 0){
				sum += currentNumber;
			}
			else{
				sum += currentNumber*3;
			}
		}
		
		int result = sum/10;
		int modulu = sum%10;
		int checkDigit = 10 - modulu;
		//if the checkDigit is 10 should be zero
		checkDigit=checkDigit==10?0:checkDigit;
		isbn13 += checkDigit;
		return isbn13;
		
	}
	
	/**
	 * Converts one or several books (up to 1000)
	 * @param groupNumber The groupNumber of the publisher (1 digit)
	 * @param publisherNumber The publisherNumber (3 digits)
	 * @param titleNumber The number of the title (5 digits)
	 * @param numOfBooks The number of books to convert - max 1000
	 * @return String the isbn 13
	 */
	public static String[] convertToEAN(int groupNumber,int publisherNumber, int titleNumber, int numOfBooks){
		if(numOfBooks>1000||numOfBooks<1){
			throw new IllegalArgumentException("Number of Books Is too large");
		}
		String [] ret = new String[numOfBooks];
		for (int i=0;i<numOfBooks;i++){
			String toConvert = ""+groupNumber+publisherNumber+titleNumber;
			ret[i] = convertToEAN (toConvert);

			titleNumber++;
		}
		return ret;
	}
	
	/**
	 * Converts an isbn String of 10 to an isbn String of 13
	 * @param isbn10 The isbn 10
	 * @return String the isbn 13
	 */
	public static String convertToISBN13(String isbn10){
		String isbn13 = convertToEAN(isbn10);
		char[] isbnOriginalChars = isbn13.toCharArray();
		char [] allChars = new char[17];
		int j=0;
		for (int i=0;i<17;i++){
			if(i==3||i==5||i==12||i==15){
				allChars[i] = '-';
			}
			else {
				allChars[i] = isbnOriginalChars[j];
				j++;
			}
			
		}
		isbn13 = new String(allChars);
		return isbn13;
	}
	
	/**
	 * Converts an isbn String of 10 to an isbn String of 13
	 * @param groupNumber The groupNumber of the publisher (1 digit)
	 * @param publisherNumber The publisherNumber (3 digits)
	 * @param titleNumber The number of the title (5 digits)
	 * @return String the isbn 13
	 */
	public static String [] convertToISBN13(int groupNumber,int publisherNumber, int titleNumber, int numOfBooks){
		if(numOfBooks>1000||numOfBooks<1){
			throw new IllegalArgumentException("Number of Books Is too large");
		}
		String [] ret = new String[numOfBooks];
		for (int i=0;i<numOfBooks;i++){
			ret[i] = convertToISBN13 (""+groupNumber+publisherNumber+titleNumber);
			titleNumber++;
		}
		return ret;

	}	
	
	public static ISBNResults convertToISBN13(int groupNumber,int publisherNumber, int titleNumber){
		String isbn10 = ""+groupNumber+publisherNumber+titleNumber;
		String isbn13 = convertToISBN13(groupNumber, publisherNumber, titleNumber, 1)[0];
		String ean = convertToEAN(groupNumber, publisherNumber, titleNumber, 1)[0];
		return new ISBNResults(isbn10,isbn13,ean);
	}
	


	public static void main(String[] args) {
//		String isbn10 = "074326715X";
//		System.out.println(isbn10);
//		String ean = convertToEAN(isbn10);
//		System.out.println(ean);
//		String isbn13 = convertToISBN13(isbn10);
//		System.out.println(isbn13);
		String isbn13 = "978-1-4116-9529-0";
		String isbn10 = convertFromIsbn13ToIsbn10(isbn13);
		System.out.println(isbn10);
//		isbn10 = convertFromIsbn13ToIsbn10(ean);
//		System.out.println(isbn10);
//		
//		String [] allConverted = convertToISBN13 (1,123,45678,10);
//		for (int i = 0; i < allConverted.length; i++) {
//			System.out.println(allConverted[i]);
//		}
	}

}