package org.bouncycastle.asn1.x500.style;

import java.io.IOException;
import java.util.Hashtable;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DERGeneralizedTime;
import org.bouncycastle.asn1.DERIA5String;
import org.bouncycastle.asn1.DERPrintableString;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x500.AttributeTypeAndValue;
import org.bouncycastle.asn1.x500.RDN;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.X500NameStyle;
import org.bouncycastle.asn1.x509.X509ObjectIdentifiers;

public class BCStyle
    implements X500NameStyle
{
    public static final X500NameStyle INSTANCE = new BCStyle();

    
country code - StringType(SIZE(2))
/**
     * country code - StringType(SIZE(2))
     */
    public static final ASN1ObjectIdentifier C = new ASN1ObjectIdentifier("2.5.4.6");

    
organization - StringType(SIZE(1..64))
/**
     * organization - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier O = new ASN1ObjectIdentifier("2.5.4.10");

    
organizational unit name - StringType(SIZE(1..64))
/**
     * organizational unit name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier OU = new ASN1ObjectIdentifier("2.5.4.11");

    
Title
/**
     * Title
     */
    public static final ASN1ObjectIdentifier T = new ASN1ObjectIdentifier("2.5.4.12");

    
common name - StringType(SIZE(1..64))
/**
     * common name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier CN = new ASN1ObjectIdentifier("2.5.4.3");

    
device serial number name - StringType(SIZE(1..64))
/**
     * device serial number name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier SN = new ASN1ObjectIdentifier("2.5.4.5");

    
street - StringType(SIZE(1..64))
/**
     * street - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier STREET = new ASN1ObjectIdentifier("2.5.4.9");

    
device serial number name - StringType(SIZE(1..64))
/**
     * device serial number name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier SERIALNUMBER = SN;

    
locality name - StringType(SIZE(1..64))
/**
     * locality name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier L = new ASN1ObjectIdentifier("2.5.4.7");

    
state, or province name - StringType(SIZE(1..64))
/**
     * state, or province name - StringType(SIZE(1..64))
     */
    public static final ASN1ObjectIdentifier ST = new ASN1ObjectIdentifier("2.5.4.8");

    
Naming attributes of type X520name
/**
     * Naming attributes of type X520name
     */
    public static final ASN1ObjectIdentifier SURNAME = new ASN1ObjectIdentifier("2.5.4.4");
    public static final ASN1ObjectIdentifier GIVENNAME = new ASN1ObjectIdentifier("2.5.4.42");
    public static final ASN1ObjectIdentifier INITIALS = new ASN1ObjectIdentifier("2.5.4.43");
    public static final ASN1ObjectIdentifier GENERATION = new ASN1ObjectIdentifier("2.5.4.44");
    public static final ASN1ObjectIdentifier UNIQUE_IDENTIFIER = new ASN1ObjectIdentifier("2.5.4.45");

    
businessCategory - DirectoryString(SIZE(1..128)
/**
     * businessCategory - DirectoryString(SIZE(1..128)
     */
    public static final ASN1ObjectIdentifier BUSINESS_CATEGORY = new ASN1ObjectIdentifier(
        "2.5.4.15");

    
postalCode - DirectoryString(SIZE(1..40)
/**
     * postalCode - DirectoryString(SIZE(1..40)
     */
    public static final ASN1ObjectIdentifier POSTAL_CODE = new ASN1ObjectIdentifier(
        "2.5.4.17");

    
dnQualifier - DirectoryString(SIZE(1..64)
/**
     * dnQualifier - DirectoryString(SIZE(1..64)
     */
    public static final ASN1ObjectIdentifier DN_QUALIFIER = new ASN1ObjectIdentifier(
        "2.5.4.46");

    
RFC 3039 Pseudonym - DirectoryString(SIZE(1..64)
/**
     * RFC 3039 Pseudonym - DirectoryString(SIZE(1..64)
     */
    public static final ASN1ObjectIdentifier PSEUDONYM = new ASN1ObjectIdentifier(
        "2.5.4.65");


    
RFC 3039 DateOfBirth - GeneralizedTime - YYYYMMDD000000Z
/**
     * RFC 3039 DateOfBirth - GeneralizedTime - YYYYMMDD000000Z
     */
    public static final ASN1ObjectIdentifier DATE_OF_BIRTH = new ASN1ObjectIdentifier(
        "1.3.6.1.5.5.7.9.1");

    
RFC 3039 PlaceOfBirth - DirectoryString(SIZE(1..128)
/**
     * RFC 3039 PlaceOfBirth - DirectoryString(SIZE(1..128)
     */
    public static final ASN1ObjectIdentifier PLACE_OF_BIRTH = new ASN1ObjectIdentifier(
        "1.3.6.1.5.5.7.9.2");

    
RFC 3039 Gender - PrintableString (SIZE(1)) -- "M", "F", "m" or "f"
/**
     * RFC 3039 Gender - PrintableString (SIZE(1)) -- "M", "F", "m" or "f"
     */
    public static final ASN1ObjectIdentifier GENDER = new ASN1ObjectIdentifier(
        "1.3.6.1.5.5.7.9.3");

    
RFC 3039 CountryOfCitizenship - PrintableString (SIZE (2)) -- ISO 3166
codes only
/**
     * RFC 3039 CountryOfCitizenship - PrintableString (SIZE (2)) -- ISO 3166
     * codes only
     */
    public static final ASN1ObjectIdentifier COUNTRY_OF_CITIZENSHIP = new ASN1ObjectIdentifier(
        "1.3.6.1.5.5.7.9.4");

    
RFC 3039 CountryOfResidence - PrintableString (SIZE (2)) -- ISO 3166
codes only
/**
     * RFC 3039 CountryOfResidence - PrintableString (SIZE (2)) -- ISO 3166
     * codes only
     */
    public static final ASN1ObjectIdentifier COUNTRY_OF_RESIDENCE = new ASN1ObjectIdentifier(
        "1.3.6.1.5.5.7.9.5");


    
ISIS-MTT NameAtBirth - DirectoryString(SIZE(1..64)
/**
     * ISIS-MTT NameAtBirth - DirectoryString(SIZE(1..64)
     */
    public static final ASN1ObjectIdentifier NAME_AT_BIRTH = new ASN1ObjectIdentifier("1.3.36.8.3.14");

    
RFC 3039 PostalAddress - SEQUENCE SIZE (1..6) OF
DirectoryString(SIZE(1..30))
/**
     * RFC 3039 PostalAddress - SEQUENCE SIZE (1..6) OF
     * DirectoryString(SIZE(1..30))
     */
    public static final ASN1ObjectIdentifier POSTAL_ADDRESS = new ASN1ObjectIdentifier("2.5.4.16");

    
RFC 2256 dmdName
/**
     * RFC 2256 dmdName
     */
    public static final ASN1ObjectIdentifier DMD_NAME = new ASN1ObjectIdentifier("2.5.4.54");

    
id-at-telephoneNumber
/**
     * id-at-telephoneNumber
     */
    public static final ASN1ObjectIdentifier TELEPHONE_NUMBER = X509ObjectIdentifiers.id_at_telephoneNumber;

    
id-at-name
/**
     * id-at-name
     */
    public static final ASN1ObjectIdentifier NAME = X509ObjectIdentifiers.id_at_name;

    
Email address (RSA PKCS#9 extension) - IA5String.
Note: if you're trying to be ultra orthodox, don't use this! It shouldn't be in here.
/**
     * Email address (RSA PKCS#9 extension) - IA5String.
     * <p>Note: if you're trying to be ultra orthodox, don't use this! It shouldn't be in here.
     */
    public static final ASN1ObjectIdentifier EmailAddress = PKCSObjectIdentifiers.pkcs_9_at_emailAddress;

    
more from PKCS#9
/**
     * more from PKCS#9
     */
    public static final ASN1ObjectIdentifier UnstructuredName = PKCSObjectIdentifiers.pkcs_9_at_unstructuredName;
    public static final ASN1ObjectIdentifier UnstructuredAddress = PKCSObjectIdentifiers.pkcs_9_at_unstructuredAddress;

    
email address in Verisign certificates
/**
     * email address in Verisign certificates
     */
    public static final ASN1ObjectIdentifier E = EmailAddress;

    /*
    * others...
    */
    public static final ASN1ObjectIdentifier DC = new ASN1ObjectIdentifier("0.9.2342.19200300.100.1.25");

    
LDAP User id.
/**
     * LDAP User id.
     */
    public static final ASN1ObjectIdentifier UID = new ASN1ObjectIdentifier("0.9.2342.19200300.100.1.1");

    
default look up table translating OID values into their common symbols following
the convention in RFC 2253 with a few extras
/**
     * default look up table translating OID values into their common symbols following
     * the convention in RFC 2253 with a few extras
     */
    private static final Hashtable DefaultSymbols = new Hashtable();

    
look up table translating common symbols into their OIDS.
/**
     * look up table translating common symbols into their OIDS.
     */
    private static final Hashtable DefaultLookUp = new Hashtable();

    static
    {
        DefaultSymbols.put(C, "C");
        DefaultSymbols.put(O, "O");
        DefaultSymbols.put(T, "T");
        DefaultSymbols.put(OU, "OU");
        DefaultSymbols.put(CN, "CN");
        DefaultSymbols.put(L, "L");
        DefaultSymbols.put(ST, "ST");
        DefaultSymbols.put(SN, "SERIALNUMBER");
        DefaultSymbols.put(EmailAddress, "E");
        DefaultSymbols.put(DC, "DC");
        DefaultSymbols.put(UID, "UID");
        DefaultSymbols.put(STREET, "STREET");
        DefaultSymbols.put(SURNAME, "SURNAME");
        DefaultSymbols.put(GIVENNAME, "GIVENNAME");
        DefaultSymbols.put(INITIALS, "INITIALS");
        DefaultSymbols.put(GENERATION, "GENERATION");
        DefaultSymbols.put(UnstructuredAddress, "unstructuredAddress");
        DefaultSymbols.put(UnstructuredName, "unstructuredName");
        DefaultSymbols.put(UNIQUE_IDENTIFIER, "UniqueIdentifier");
        DefaultSymbols.put(DN_QUALIFIER, "DN");
        DefaultSymbols.put(PSEUDONYM, "Pseudonym");
        DefaultSymbols.put(POSTAL_ADDRESS, "PostalAddress");
        DefaultSymbols.put(NAME_AT_BIRTH, "NameAtBirth");
        DefaultSymbols.put(COUNTRY_OF_CITIZENSHIP, "CountryOfCitizenship");
        DefaultSymbols.put(COUNTRY_OF_RESIDENCE, "CountryOfResidence");
        DefaultSymbols.put(GENDER, "Gender");
        DefaultSymbols.put(PLACE_OF_BIRTH, "PlaceOfBirth");
        DefaultSymbols.put(DATE_OF_BIRTH, "DateOfBirth");
        DefaultSymbols.put(POSTAL_CODE, "PostalCode");
        DefaultSymbols.put(BUSINESS_CATEGORY, "BusinessCategory");
        DefaultSymbols.put(TELEPHONE_NUMBER, "TelephoneNumber");
        DefaultSymbols.put(NAME, "Name");

        DefaultLookUp.put("c", C);
        DefaultLookUp.put("o", O);
        DefaultLookUp.put("t", T);
        DefaultLookUp.put("ou", OU);
        DefaultLookUp.put("cn", CN);
        DefaultLookUp.put("l", L);
        DefaultLookUp.put("st", ST);
        DefaultLookUp.put("sn", SN);
        DefaultLookUp.put("serialnumber", SN);
        DefaultLookUp.put("street", STREET);
        DefaultLookUp.put("emailaddress", E);
        DefaultLookUp.put("dc", DC);
        DefaultLookUp.put("e", E);
        DefaultLookUp.put("uid", UID);
        DefaultLookUp.put("surname", SURNAME);
        DefaultLookUp.put("givenname", GIVENNAME);
        DefaultLookUp.put("initials", INITIALS);
        DefaultLookUp.put("generation", GENERATION);
        DefaultLookUp.put("unstructuredaddress", UnstructuredAddress);
        DefaultLookUp.put("unstructuredname", UnstructuredName);
        DefaultLookUp.put("uniqueidentifier", UNIQUE_IDENTIFIER);
        DefaultLookUp.put("dn", DN_QUALIFIER);
        DefaultLookUp.put("pseudonym", PSEUDONYM);
        DefaultLookUp.put("postaladdress", POSTAL_ADDRESS);
        DefaultLookUp.put("nameofbirth", NAME_AT_BIRTH);
        DefaultLookUp.put("countryofcitizenship", COUNTRY_OF_CITIZENSHIP);
        DefaultLookUp.put("countryofresidence", COUNTRY_OF_RESIDENCE);
        DefaultLookUp.put("gender", GENDER);
        DefaultLookUp.put("placeofbirth", PLACE_OF_BIRTH);
        DefaultLookUp.put("dateofbirth", DATE_OF_BIRTH);
        DefaultLookUp.put("postalcode", POSTAL_CODE);
        DefaultLookUp.put("businesscategory", BUSINESS_CATEGORY);
        DefaultLookUp.put("telephonenumber", TELEPHONE_NUMBER);
        DefaultLookUp.put("name", NAME);
    }

    protected BCStyle()
    {

    }
    
    public ASN1Encodable stringToValue(ASN1ObjectIdentifier oid, String value)
    {
        if (value.length() != 0 && value.charAt(0) == '#')
        {
            try
            {
                return IETFUtils.valueFromHexString(value, 1);
            }
            catch (IOException e)
            {
                throw new RuntimeException("can't recode value for oid " + oid.getId());
            }
        }
        else
        {
            if (value.length() != 0 && value.charAt(0) == '\\')
            {
                value = value.substring(1);
            }
            if (oid.equals(EmailAddress) || oid.equals(DC))
            {
                return new DERIA5String(value);
            }
            else if (oid.equals(DATE_OF_BIRTH))  // accept time string as well as # (for compatibility)
            {
                return new DERGeneralizedTime(value);
            }
            else if (oid.equals(C) || oid.equals(SN) || oid.equals(DN_QUALIFIER)
                || oid.equals(TELEPHONE_NUMBER))
            {
                return new DERPrintableString(value);
            }
        }

        return new DERUTF8String(value);
    }

    public ASN1ObjectIdentifier attrNameToOID(String attrName)
    {
        return IETFUtils.decodeAttrName(attrName, DefaultLookUp);
    }

    public boolean areEqual(X500Name name1, X500Name name2)
    {
        RDN[] rdns1 = name1.getRDNs();
        RDN[] rdns2 = name2.getRDNs();

        if (rdns1.length != rdns2.length)
        {
            return false;
        }

        boolean reverse = false;

        if (rdns1[0].getFirst() != null && rdns2[0].getFirst() != null)
        {
            reverse = !rdns1[0].getFirst().getType().equals(rdns2[0].getFirst().getType());  // guess forward
        }

        for (int i = 0; i != rdns1.length; i++)
        {
            if (!foundMatch(reverse, rdns1[i], rdns2))
            {
                return false;
            }
        }

        return true;
    }

    private boolean foundMatch(boolean reverse, RDN rdn, RDN[] possRDNs)
    {
        if (reverse)
        {
            for (int i = possRDNs.length - 1; i >= 0; i--)
            {
                if (possRDNs[i] != null && rdnAreEqual(rdn, possRDNs[i]))
                {
                    possRDNs[i] = null;
                    return true;
                }
            }
        }
        else
        {
            for (int i = 0; i != possRDNs.length; i++)
            {
                if (possRDNs[i] != null && rdnAreEqual(rdn, possRDNs[i]))
                {
                    possRDNs[i] = null;
                    return true;
                }
            }
        }

        return false;
    }

    protected boolean rdnAreEqual(RDN rdn1, RDN rdn2)
    {
        if (rdn1.isMultiValued())
        {
            if (rdn2.isMultiValued())
            {
                AttributeTypeAndValue[] atvs1 = rdn1.getTypesAndValues();
                AttributeTypeAndValue[] atvs2 = rdn2.getTypesAndValues();

                if (atvs1.length != atvs2.length)
                {
                    return false;
                }

                for (int i = 0; i != atvs1.length; i++)
                {
                    if (!atvAreEqual(atvs1[i], atvs2[i]))
                    {
                        return false;
                    }
                }
            }
            else
            {
                return false;
            }
        }
        else
        {
            if (!rdn2.isMultiValued())
            {
                return atvAreEqual(rdn1.getFirst(), rdn2.getFirst());
            }
            else
            {
                return false;
            }
        }

        return true;
    }

    private boolean atvAreEqual(AttributeTypeAndValue atv1, AttributeTypeAndValue atv2)
    {
        if (atv1 == atv2)
        {
            return true;
        }

        if (atv1 == null)
        {
            return false;
        }

        if (atv2 == null)
        {
            return false;
        }

        ASN1ObjectIdentifier o1 = atv1.getType();
        ASN1ObjectIdentifier o2 = atv2.getType();

        if (!o1.equals(o2))
        {
            return false;
        }

        String v1 = IETFUtils.canonicalize(IETFUtils.valueToString(atv1.getValue()));
        String v2 = IETFUtils.canonicalize(IETFUtils.valueToString(atv2.getValue()));

        if (!v1.equals(v2))
        {
            return false;
        }

        return true;
    }

    public RDN[] fromString(String dirName)
    {
        return IETFUtils.rDNsFromString(dirName, this);
    }

    public int calculateHashCode(X500Name name)
    {
        int hashCodeValue = 0;
        RDN[] rdns = name.getRDNs();

        // this needs to be order independent, like equals
        for (int i = 0; i != rdns.length; i++)
        {
            if (rdns[i].isMultiValued())
            {
                AttributeTypeAndValue[] atv = rdns[i].getTypesAndValues();

                for (int j = 0; j != atv.length; j++)
                {
                    hashCodeValue ^= atv[j].getType().hashCode();
                    hashCodeValue ^= calcHashCode(atv[j].getValue());
                }
            }
            else
            {
                hashCodeValue ^= rdns[i].getFirst().getType().hashCode();
                hashCodeValue ^= calcHashCode(rdns[i].getFirst().getValue());
            }
        }

        return hashCodeValue;
    }

    private int calcHashCode(ASN1Encodable enc)
    {
        String value = IETFUtils.valueToString(enc);

        value = IETFUtils.canonicalize(value);

        return value.hashCode();
    }

    public String toString(X500Name name)
    {
        StringBuffer buf = new StringBuffer();
        boolean first = true;

        RDN[] rdns = name.getRDNs();

        for (int i = 0; i < rdns.length; i++)
        {
            if (first)
            {
                first = false;
            }
            else
            {
                buf.append(',');
            }

            if (rdns[i].isMultiValued())
            {
                AttributeTypeAndValue[] atv = rdns[i].getTypesAndValues();
                boolean firstAtv = true;

                for (int j = 0; j != atv.length; j++)
                {
                    if (firstAtv)
                    {
                        firstAtv = false;
                    }
                    else
                    {
                        buf.append('+');
                    }
                    
                    IETFUtils.appendTypeAndValue(buf, atv[j], DefaultSymbols);
                }
            }
            else
            {
                IETFUtils.appendTypeAndValue(buf, rdns[i].getFirst(), DefaultSymbols);
            }
        }

        return buf.toString();
    }
}