/**
 * Copyright (c) 2013, Redsolution LTD. All rights reserved.
 *
 * This file is part of Xabber project; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License, Version 3.
 *
 * Xabber 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, see http://www.gnu.org/licenses/.
 */
package com.xabber.android.ui.adapter;

import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;

import com.xabber.android.data.entity.BaseEntity;
import com.xabber.android.data.roster.AbstractContact;

import java.util.ArrayList;
import java.util.Locale;

/**
 * Base adapter for the list of contacts.
 *
 * @author alexander.ivanov
 */
public abstract class BaseContactAdapter<Inflater extends BaseContactInflater>
        extends BaseAdapter implements UpdatableAdapter, Filterable {

    final Activity activity;

    final Locale locale;

    /**
     * List of entities.
     */
    final ArrayList<BaseEntity> baseEntities;

    /**
     * Used view inflater.
     */
    final Inflater inflater;

    /**
     * Contact filter.
     */
    ContactFilter contactFilter;

    /**
     * Filter string. Can be <code>null</code> if filter is disabled.
     */
    String filterString;

    public BaseContactAdapter(Activity activity, Inflater inflater) {
        this.activity = activity;
        this.locale = Locale.getDefault();
        this.baseEntities = new ArrayList<>();
        this.inflater = inflater;
        inflater.setAdapter(this);
        contactFilter = null;
        filterString = null;
    }

    @Override
    public void onChange() {
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return baseEntities.size();
    }

    @Override
    public Object getItem(int position) {
        return baseEntities.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final View view;
        if (convertView == null) {
            view = inflater.createView(position, parent);
            view.setTag(inflater.createViewHolder(position, view));
        } else {
            view = convertView;
        }
        inflater.getView(view, (AbstractContact) getItem(position));
        return view;
    }

    @Override
    public Filter getFilter() {
        if (contactFilter == null) {
            contactFilter = new ContactFilter();
        }
        return contactFilter;
    }

    private class ContactFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            return null;
        }

        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {
            if (constraint == null || constraint.length() == 0) {
                filterString = null;
            } else {
                filterString = constraint.toString().toLowerCase(locale);
            }
            onChange();
        }

    }

}
