package expressaoregular;

public class MascaraValidacaoEmail {

    public static boolean ehEmailValido(String email) {
        if (emailValido(email) && emailSentencasMinusculasEArroba(email)
                && emailSimboloInicialValido(email)
                && emailFinalizaSequenciaValida(email)
                && simbolosInternosObrigatorios(email)) {
            return true;
        }
        return false;
    }

    private static boolean simbolosInternosObrigatorios(String email) {
        String[] emailSplited = email.split("@");
            if (emailSplited[0].matches("\\D+")
                    && emailSplited[1].matches("\\D+\\.br")) {
                return true;
            }
        return false;
    }

    private static boolean emailFinalizaSequenciaValida(String email) {
        if (email.endsWith(".br")) {
            return true;
        }
        return false;
    }

    private static boolean emailSimboloInicialValido(String email) {
        String charInicial = String.valueOf(email.charAt(0));
        return charInicial.matches("\\p{Lower}");
    }

    private static boolean emailSentencasMinusculasEArroba(String email) {
        String[] emailSplited = email.split("@");

        if (emailSplited.length < 2 || emailSplited.length > 2) {
            return false;
        }

        for (String itemEmail : emailSplited) {
            for (int i = 0; i < itemEmail.length(); i++) {
                if (Character.isUpperCase(itemEmail.charAt(i))) {
                    return false;
                }
            }
        }
        return true;
    }

    private static boolean emailValido(String email) {
        if (email == null || email.trim().isEmpty()) {
            return false;
        }

        return true;

    }

}