package aQute.libg.asn1;

import java.util.*;

public class PDU implements Types, Iterable<PDU> {
    final int identifier;
    final Object  payload;
    byte data[] = new byte[100];


    public PDU(int id, Object payload) {
        identifier = id;
        this.payload = payload;
    }

    public PDU(Date payload) {
        identifier = UTCTIME;
        this.payload = payload;
    }

    public PDU(int n) {
        this(UNIVERSAL+INTEGER, n);
    }

    public PDU(boolean value) {
        this(UNIVERSAL+BOOLEAN, value);
    }

    public PDU(String s) throws Exception {
        this(UNIVERSAL+IA5STRING, s);
    }
    
    public PDU(byte[] data) {
        this(UNIVERSAL+OCTET_STRING, data);
    }
    
    public PDU(BitSet bits) {
        this(UNIVERSAL+BIT_STRING, bits);
    }

    public PDU(int top, int l1, int... remainder) {
        identifier = UNIVERSAL+OBJECT_IDENTIFIER;
        int[] ids = new int[remainder.length + 2];
        ids[0] = top;
        ids[1] = l1;
        System.arraycopy(remainder, 0, ids, 2, remainder.length);
        payload = ids;
    }

    public PDU(int tag, PDU... set) {
        this(tag,(Object)set);
    }

    public PDU(PDU... set) {
        this(SEQUENCE+CONSTRUCTED,set);
    }


    public int getTag() {
        return identifier & TAGMASK;
    }

    int getClss() {
        return identifier & CLASSMASK;
    }

    public boolean isConstructed() {
        return (identifier & CONSTRUCTED) != 0;
    }

    public String getString() {
        return (String) payload;
    }

    public Iterator<PDU> iterator() {
        return Arrays.asList((PDU[]) payload).iterator();
    }

    
    public int[] getOID() {
        assert getTag() == OBJECT_IDENTIFIER;
        return (int[]) payload;
    }

    public Boolean getBoolean() {
        assert getTag() == BOOLEAN;
        return (Boolean) payload;
    }

    public BitSet getBits() {
        assert getTag() == BIT_STRING;
        return (BitSet) payload;
    }

    public int getInt() {
        assert getTag() == INTEGER || getTag() == ENUMERATED;
        return (Integer) payload;
    }

    public byte[] getBytes() {
        return (byte[]) payload;
    }

    public PDU[] getChildren() {
        assert isConstructed();
        return (PDU[]) payload;
    }

    public Date getDate() {
        assert getTag() == UTCTIME || getTag() == GENERALIZED_TIME;
        return (Date) payload;
    }

}