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/*******************************************************************************
 * Copyright 2011, 2013 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package uk.co.senab.bitmapcache.samples;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashSet;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.view.ViewPager;

public class ViewPagerActivity extends Activity {

	static final int PUG_COUNT = 20;

	/**
	 * This task simply gets a list of URLs of Photos from PugMe
	 */
	private class PugListAsyncTask extends AsyncTask> {

		static final String PUG_ME_URL = "http://pugme.herokuapp.com/bomb?count=" + PUG_COUNT;

		@Override
		protected ArrayList doInBackground(Void... params) {
			try {
				HttpURLConnection conn = (HttpURLConnection) new URL(PUG_ME_URL).openConnection();
				conn.setRequestProperty("Accept", "application/json");
				InputStream is = conn.getInputStream();

				StringBuilder sb = new StringBuilder();
				BufferedReader r = new BufferedReader(new InputStreamReader(is), 1024);
				for (String line = r.readLine(); line != null; line = r.readLine()) {
					sb.append(line);
				}
				try {
					is.close();
				} catch (IOException e) {
				}

				String response = sb.toString();
				JSONObject document = new JSONObject(response);

				JSONArray pugsJsonArray = document.getJSONArray("pugs");
				HashSet pugUrls = new HashSet(pugsJsonArray.length());

				for (int i = 0, z = pugsJsonArray.length(); i < z; i++) {
					pugUrls.add(pugsJsonArray.getString(i));
				}

				return new ArrayList(pugUrls);

			} catch (MalformedURLException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (JSONException e) {
				e.printStackTrace();
			}

			return null;
		}

		@Override
		protected void onPostExecute(ArrayList result) {
			super.onPostExecute(result);

			PugPagerAdapter adapter = new PugPagerAdapter(ViewPagerActivity.this, result);
			mViewPager.setAdapter(adapter);
		}

	}

	private ViewPager mViewPager;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		mViewPager = new ViewPager(this);
		setContentView(mViewPager);

		// Start Pug List Download
		new PugListAsyncTask().execute();
	}

}