/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.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 3 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, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.preference;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.os.AsyncTask.Status;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.util.AttributeSet;

import org.getlantern.firetweet.Constants;
import org.getlantern.firetweet.R;

public abstract class AsyncTaskPreference extends Preference implements Constants, OnPreferenceClickListener {

	private Task mTask;

	public AsyncTaskPreference(final Context context) {
		this(context, null);
	}

	public AsyncTaskPreference(final Context context, final AttributeSet attrs) {
		this(context, attrs, android.R.attr.preferenceStyle);
	}

	public AsyncTaskPreference(final Context context, final AttributeSet attrs, final int defStyle) {
		super(context, attrs, defStyle);
		setOnPreferenceClickListener(this);
	}

	@Override
	public final boolean onPreferenceClick(final Preference preference) {
		if (mTask == null || mTask.getStatus() != Status.RUNNING) {
			mTask = new Task(this);
			mTask.execute();
		}
		return true;
	}

	protected abstract void doInBackground();

	private static class Task extends AsyncTask<Object, Object, Object> {

		private final AsyncTaskPreference mPreference;
		private final Context mContext;
		private final ProgressDialog mProgress;

		public Task(final AsyncTaskPreference preference) {
			mPreference = preference;
			mContext = preference.getContext();
			mProgress = new ProgressDialog(mContext);
		}

		@Override
		protected Object doInBackground(final Object... args) {
			mPreference.doInBackground();
			return null;
		}

		@Override
		protected void onPostExecute(final Object result) {
			if (mProgress == null) return;
			if (mProgress.isShowing()) {
				mProgress.dismiss();
			}
		}

		@Override
		protected void onPreExecute() {
			if (mProgress == null) return;
			if (mProgress.isShowing()) {
				mProgress.dismiss();
			}
			mProgress.setMessage(mContext.getString(R.string.please_wait));
			mProgress.setCancelable(false);
			mProgress.show();
		}

	}

}