/**
 * Copyright (C) 2013 Premium Minds.
 *
 * This file is part of billy spain (ES Pack).
 *
 * billy spain (ES Pack) is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * billy spain (ES Pack) is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with billy spain (ES Pack). If not, see <http://www.gnu.org/licenses/>.
 */
package com.premiumminds.billy.spain.util;

import com.premiumminds.billy.core.util.FinancialValidator;

public class ESFinancialValidator extends FinancialValidator {

	public static final String	ES_COUNTRY_CODE	= "ES";

	public ESFinancialValidator(String financialID) {
		super(financialID);
	}

	@Override
	public boolean isValid() {
		{		
			if(financialID.length()!=9) return false;
			String cif = financialID.toUpperCase();
			int[] numbers = new int[9];
			for(int i=0; i<9; i++)
				numbers[i] = Character.getNumericValue(cif.charAt(i));
				
			if(!cif.matches("((^[A-Z]{1}[0-9]{7}[A-Z0-9]{1}$|^[T]{1}[A-Z0-9]{8}$)|^[0-9]{8}[A-Z]{1}$)")) return false;
			
			String controlDigits = "TRWAGMYFPDXBNJZSQVHLCKE";
			char lastDigit = cif.charAt(8);
			if(cif.matches("(^[0-9]{8}[A-Z]{1}$)"))
			{
				//TODO: check if this do what is pretended
				if(lastDigit == controlDigits.charAt(Integer.parseInt(cif.substring(0, 8)) % 23))
					return true;
				else
					return false;
			}
			
			
			int sum = numbers[2] + numbers[4] + numbers[6];
			for(int i = 1; i < 8; i+=2)
			{
				sum += (2*numbers[i] / 10) + (2*numbers[i] % 10);
			}
			int n = 10 - (sum % 10);
			
			if(cif.matches("^[KLM]{1}.*"))
			{
				//TODO: check if this do what is pretended
				if(lastDigit == (char)(64+n) || lastDigit == controlDigits.charAt(Integer.parseInt(cif.substring(1, 8)) % 23))
					return true;
				else
					return false;
			}
			
			if(cif.matches("^[ABCDEFGHJNPQRSUVW]{1}.*"))
			{
				if(lastDigit == (char)(64+n) || numbers[8] == n % 10)
					return true;
				else
					return false;
			}
			
			if(cif.matches("^[T]{1}.*"))
			{
				int value = cif.matches("^[T]{1}[A-Z0-9]{8}$") ? 1 : 0;
				if(numbers[8] == value)
					return true;
				else
					return false;
			}
			
			if(cif.matches("^[XYZ]{1}.*"))
			{
				String cif_aux = cif.replace('X', '0').replace('Y', '1').replace('Z', '2');
				if(lastDigit == controlDigits.charAt(Integer.parseInt(cif_aux.substring(0, 8)) % 23))
					return true;
			}
			
			return false;
		}
	}

}