/*
* Copyright (C) 2013 Samsung System LSI
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.bluetooth.map;

import java.io.IOException;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.xmlpull.v1.XmlSerializer;

import android.util.Log;
import android.util.Xml;

public class BluetoothMapMessageListing {
    private boolean hasUnread = false;
    private static final String TAG = "BluetoothMapMessageListing";
    private List<BluetoothMapMessageListingElement> list;

    public BluetoothMapMessageListing(){
     list = new ArrayList<BluetoothMapMessageListingElement>();
    }
    public void add(BluetoothMapMessageListingElement element) {
        list.add(element);
        /* update info regarding whether the list contains unread messages */
        if (element.getRead().equalsIgnoreCase("no"))
        {
            hasUnread = true;
        }
    }

    /**
     * Used to fetch the number of BluetoothMapMessageListingElement elements in the list.
     * @return the number of elements in the list.
     */
    public int getCount() {
        if(list != null)
        {
            return list.size();
        }
        return 0;
    }

    /**
     * does the list contain any unread messages
     * @return true if unread messages have been added to the list, else false
     */
    public boolean hasUnread()
    {
        return hasUnread;
    }

    /**
     * Encode the list of BluetoothMapMessageListingElement(s) into a UTF-8
     * formatted XML-string in a trimmed byte array
     *
     * @return a reference to the encoded byte array.
     * @throws UnsupportedEncodingException
     *             if UTF-8 encoding is unsupported on the platform.
     */
    public byte[] encode() throws UnsupportedEncodingException {
        StringWriter sw = new StringWriter();
        XmlSerializer xmlMsgElement = Xml.newSerializer();
        try {
            xmlMsgElement.setOutput(sw);
            xmlMsgElement.startDocument(null, null);
            xmlMsgElement.startTag("", "MAP-msg-listing");
            xmlMsgElement.attribute("", "version", "1.0");
            // Do the XML encoding of list
            for (BluetoothMapMessageListingElement element : list) {
                element.encode(xmlMsgElement); // Append the list element
            }
            xmlMsgElement.endTag("", "MAP-msg-listing");
            xmlMsgElement.endDocument();
        } catch (IllegalArgumentException e) {
            Log.w(TAG, e.toString());
        } catch (IllegalStateException e) {
            Log.w(TAG, e.toString());
        } catch (IOException e) {
            Log.w(TAG, e.toString());
        }
        return sw.toString().getBytes("UTF-8");
    }

    public void sort() {
        Collections.sort(list);
    }

    public void segment(int count, int offset) {
        count = Math.min(count, list.size());
        if (offset + count <= list.size()) {
            list = list.subList(offset, offset + count);
        } else {
            list = null;
        }
    }
}