/*
 * Tint Browser for Android
 * 
 * Copyright (C) 2012 - to infinity and beyond J. Devauchelle and contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 3 as published by the Free Software Foundation.
 *
 * 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.
 */

package com.seal.tasks;

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.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import android.content.Context;
import android.os.AsyncTask;

import com.seal.R;
import com.seal.model.SearchUrlGroup;

public class SearchUrlTask extends AsyncTask<Void, Integer, String> {

	private Context mContext;
	private ISearchUrlTaskListener mListener;

	private Map<String, SearchUrlGroup> mResults;

	public SearchUrlTask(Context context, ISearchUrlTaskListener listener) {
		super();

		mContext = context;
		mListener = listener;

		mResults = new HashMap<String, SearchUrlGroup>();
	}

	public List<SearchUrlGroup> getResults() {
		List<SearchUrlGroup> result = new ArrayList<SearchUrlGroup>();
		for (SearchUrlGroup group : mResults.values()) {
			group.sort();
			result.add(group);
		}

		Collections.sort(result, new Comparator<SearchUrlGroup>() {
			@Override
			public int compare(SearchUrlGroup lhs, SearchUrlGroup rhs) {
				return lhs.getName().compareTo(rhs.getName());
			}
		});

		return result;
	}

	@Override
	protected String doInBackground(Void... params) {

		publishProgress(0);

		String message = null;
		HttpURLConnection c = null;

		try {
			URL url = new URL("http://anasthase.github.com/TintBrowser/search-engines.json");
			c = (HttpURLConnection) url.openConnection();

			c.connect();

			int responseCode = c.getResponseCode();

			if (responseCode == 200) {
				StringBuilder sb = new StringBuilder();

				InputStream is = c.getInputStream();
				BufferedReader reader = new BufferedReader(new InputStreamReader(is));

				String line;
				while ((line = reader.readLine()) != null) {
					sb.append(line);
				}

				publishProgress(1);

				JSONArray jsonArray = new JSONArray(sb.toString());

				for (int i = 0; i < jsonArray.length(); i++) {
					JSONObject jsonObject = jsonArray.getJSONObject(i);

					String groupName = jsonObject.getString("group");

					SearchUrlGroup group = mResults.get(groupName);
					if (group == null) {
						group = new SearchUrlGroup(groupName);
						mResults.put(groupName, group);
					}

					JSONArray items = jsonObject.getJSONArray("items");
					for (int j = 0; j < items.length(); j++) {
						JSONObject item = items.getJSONObject(j);

						group.addItem(item.getString("name"), item.getString("url"));
					}
				}

			} else {
				message = String.format(mContext.getString(R.string.SearchUrlBadResponseCodeMessage), Integer.toString(responseCode));
			}

		} catch (MalformedURLException e) {
			message = e.getMessage();
		} catch (IOException e) {
			message = e.getMessage();
		} catch (JSONException e) {
			message = e.getMessage();
		} finally {
			if (c != null) {
				c.disconnect();
			}
		}

		return message;
	}

	@Override
	protected void onProgressUpdate(Integer... values) {
		if (mListener != null) {
			mListener.onProgress(values[0]);
		}
	}

	@Override
	protected void onPostExecute(String result) {
		if (mListener != null) {
			mListener.onDone(result);
		}
	}

	public interface ISearchUrlTaskListener {

		void onProgress(int step);

		void onDone(String result);

	}

}