/*
    This file is part of Peers, a java SIP softphone.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    Copyright 2007, 2008, 2009, 2010 Yohann Martineau 
*/

package peers.sip.syntaxencoding;

import java.util.ArrayList;

import peers.sip.RFC3261;


@SuppressWarnings("unused")
public class SipHeaders {
    
    private final ArrayList<SipHeader> headers;
    
    public SipHeaders() {
        headers = new ArrayList<>();
    }
    
    /**
     * 
     * @param name SipHeaderFieldName
     * @param value SipHeaderFieldValue
     * @param index -1 to add at the end
     */
    public void add(SipHeaderFieldName name, SipHeaderFieldValue value, int index) {
        SipHeader header = new SipHeader(name, value);
        if (headers.contains(header)) {
            header =  headers.get(headers.indexOf(header));
            SipHeaderFieldValue oldValue = header.getValue();
            //TODO check is header can be multi valued
            if (oldValue instanceof SipHeaderFieldMultiValue) {
                SipHeaderFieldMultiValue oldMultiVal = (SipHeaderFieldMultiValue) oldValue;
                oldMultiVal.getValues().add(value);
            } else {
                ArrayList<SipHeaderFieldValue> arr = new ArrayList<>();
                arr.add(oldValue);
                arr.add(value);
                header.setValue(new SipHeaderFieldMultiValue(arr));
            }
        } else {
            if (index == -1) {
                headers.add(header);
            } else {
                headers.add(index, header);
            }
        }
    }
    
    public void add(SipHeaderFieldName name, SipHeaderFieldValue value) {
        add(name, value, -1);
    }
    
    @SuppressWarnings("unlikely-arg-type")
	public void remove(SipHeaderFieldName name) {
        headers.remove(name);
    }
    
    public boolean contains(SipHeaderFieldName name) {
        return headers.contains(new SipHeader(name, null));
    }
    
    public SipHeaderFieldValue get(SipHeaderFieldName name) {
        int index = headers.indexOf(new SipHeader(name, null));
        if (index < 0) {
            return null;
        }
        return headers.get(index).getValue();
    }
    
    public int getCount() {
        return headers.size();
    }

    @Override
    public String toString() {
        StringBuilder buf = new StringBuilder();
        for (SipHeader header : headers) {
            buf.append(header.getName().toString());
            buf.append(": ");
            buf.append(header.getValue());
            buf.append(RFC3261.CRLF);
        }
        return buf.toString();
    }
}