/*

 * Hedgewars for Android. An Android port of Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * 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 2

 * of the License, or (at your option) 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

package org.hedgewars.hedgeroid;

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

import org.hedgewars.hedgeroid.netplay.MessageLog;

import android.content.Context;

import android.text.method.LinkMovementMethod;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView.LayoutParams;

import android.widget.BaseAdapter;

import android.widget.TextView;

/**

 * Optimization: ListView is smart enough to try re-using the same view for an item

 * with the same ID, but it still calls getView for those items when the list changes.

 * Since lines with a given ID never change in our chatlog, we can avoid the effort

 * of TextView.setText in many cases by checking if the view is already set up for the

 * line with the right ID - but to do that, the view needs to remember the ID it's

 * holding the text for. That's what the LoglineView does.

 */

class LoglineView extends TextView {

    long chatlogId = -1;

    public LoglineView(Context context) {

        super(context);

    }

}

/**

 * For performance reasons, the chatlog is implemented as ListView instead of a

 * single TextView (although I later learned that TextView might also have

 * facilities for efficient appending with limited backlog... oh well, this

 * works). Every chat line is a line in the ListView, and this adapter prepares

 * the textviews from a messagelog in an efficient way.

 */

public class ChatlogAdapter extends BaseAdapter implements MessageLog.Listener {

    long idOffset = 0;

    private List<CharSequence> log = new ArrayList<CharSequence>();

    private Context context;

    public ChatlogAdapter(Context context) {

        this.context = context;

    }

    public int getCount() {

        return log.size();

    }

    public Object getItem(int position) {

        return log.get(position);

    }

    public long getItemId(int position) {

        return position+idOffset;

    }

    public boolean hasStableIds() {

        return true;

    }

    public void clear() {

        idOffset += log.size();

        log.clear();

        notifyDataSetChanged();

    }

    public void lineAdded(CharSequence text) {

        log.add(text);

        notifyDataSetChanged();

    }

    public void lineRemoved() {

        log.remove(0);

        idOffset += 1;

        notifyDataSetChanged();

    }

    public void setLog(Collection<CharSequence> log) {

        idOffset += log.size();

        this.log = new ArrayList<CharSequence>(log);

        notifyDataSetChanged();

    }

    public View getView(int position, View convertView, ViewGroup parent) {

        LoglineView v = (LoglineView)convertView;

        if (v == null) {

            v = new LoglineView(context);

            v.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

            v.setMovementMethod(LinkMovementMethod.getInstance());

        }

        long id = getItemId(position);

        if(id != v.chatlogId) {

            v.setText(log.get(position));

            v.chatlogId = id;

        }

        return v;

    }

}