package org.hedgewars.hedgeroid.netplay;

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

import org.hedgewars.hedgeroid.netplay.MessageLog.Observer;

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);

	}

}

public class ChatlogAdapter extends BaseAdapter implements Observer {

	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;

	}

}