/*
 *  This file is part of SWADroid.
 *
 *  Copyright (C) 2010 Juan Miguel Boyero Corral <juanmi1982@gmail.com>
 *
 *  SWADroid 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
 *  (at your option) any later version.
 *
 *  SWADroid 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 SWADroid.  If not, see <http://www.gnu.org/licenses/>.
 */

package es.ugr.swad.swadroid.modules.rollcall.sessions;

import java.util.LinkedHashMap;
import java.util.Map;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import es.ugr.swad.swadroid.R;

/**
 * Separated list adapter.
 * @author Jeff Sharkey
 * @author Antonio Aguilera Malagon <aguilerin@gmail.com>
 */
public class SeparatedListAdapter extends BaseAdapter {
	public final Map<String,Adapter> sections = new LinkedHashMap<String,Adapter>();
	public final ArrayAdapter<String> headers;
	public final static int TYPE_SECTION_HEADER = 0;

	public SeparatedListAdapter(Context context) {
		headers = new ArrayAdapter<String>(context, R.layout.list_header);
	}

	public void addSection(String section, Adapter adapter) {
		this.headers.add(section);
		this.sections.put(section, adapter);
	}

	@Override
	public int getCount() {
		// total together all sections, plus one for each section header
		int total = 0;
		for(Adapter adapter : this.sections.values())
			total += adapter.getCount() + 1;
		return total;
	}

	@Override
	public Object getItem(int position) {
		for(Object section : this.sections.keySet()) {
			Adapter adapter = sections.get(section);
			int size = adapter.getCount() + 1;

			// check if position inside this section
			if(position == 0)
				return section;
			if(position < size)
				return adapter.getItem(position - 1);

			// otherwise jump into next section
			position -= size;
		}
		return null;
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		int sectionnum = 0;
		for(Object section : this.sections.keySet()) {
			Adapter adapter = sections.get(section);
			int size = adapter.getCount() + 1;

			// check if position inside this section
			if(position == 0)
				return headers.getView(sectionnum, convertView, parent);
			if(position < size)
				return adapter.getView(position - 1, convertView, parent);

			// otherwise jump into next section
			position -= size;
			sectionnum++;
		}
		return null;
	}

	public int getViewTypeCount() {
		// assume that headers count as one, then total all sections
		int total = 1;
		for(Adapter adapter : this.sections.values())
			total += adapter.getViewTypeCount();
		return total;
	}

	public int getItemViewType(int position) {
		int type = 1;
		for(Object section : this.sections.keySet()) {
			Adapter adapter = sections.get(section);
			int size = adapter.getCount() + 1;

			// check if position inside this section
			if(position == 0)
				return TYPE_SECTION_HEADER;
			if(position < size)
				return type + adapter.getItemViewType(position - 1);

			// otherwise jump into next section
			position -= size;
			type += adapter.getViewTypeCount();
		}
		return -1;
	}

	public boolean areAllItemsSelectable() {
		return false;
	}

	public boolean isEnabled(int position) {
		return (getItemViewType(position) != TYPE_SECTION_HEADER);
	}

}
