/src/main/java/com/fortech/taxesmemo/util/validator/EmailValidator.java

package com.fortech.taxesmemo.util.validator;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;

import org.primefaces.PrimeFaces;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import com.fortech.taxesmemo.services.UserService;

@Component
@Scope("request")
public class EmailValidator implements Validator {

	@Autowired
	private UserService userService;

	private static final Pattern VALID_EMAIL_ADDRESS_REGEX = Pattern
			.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);

	public static boolean isValidEmail(String email) {
		Matcher matcher = VALID_EMAIL_ADDRESS_REGEX.matcher(email);
		if (matcher.find()) {
			return true;
		}
		return false;
	}

	@Override
	public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
		if (value.toString() == null || value.toString().length() == 0) {
			FacesMessage msg = new FacesMessage("Email cannot be empty.", "Please enter your email.");
			msg.setSeverity(FacesMessage.SEVERITY_ERROR);

			throw new ValidatorException(msg);
		} else if (!isValidEmail(value.toString())) {
			FacesMessage msg = new FacesMessage(
					"Invalid Email: please provide an email address in abcd@abc.abc format.",
					"Please enter a valid email address.");
			msg.setSeverity(FacesMessage.SEVERITY_ERROR);

			throw new ValidatorException(msg);
		}

		else if (userService.findbyEmail(value.toString())) {
			System.out.println("throw error message..mail already taken!");
			FacesMessage msg = new FacesMessage("Invalid Email: A user with this email is already registered.",
					"Please enter another email.");
			msg.setSeverity(FacesMessage.SEVERITY_ERROR);

			throw new ValidatorException(msg);
		}

	}

	public void reset() {
		PrimeFaces.current().resetInputs("userForm");
	}
}