/*

 * 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;

	}

}