package com.example.geo_api03;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.Toast;


public class MainActivity extends Activity implements OnItemClickListener {

	private static final String LOG_TAG = "Google Places Autocomplete";
	private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
	private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
	private static final String OUT_JSON = "/json";

	private static final String API_KEY = "AIzaSyBXw9vydHGGjBOYSeM9i-Xh8f9Mk0xzg1k";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		AutoCompleteTextView autoCompView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);

		autoCompView.setAdapter(new GooglePlacesAutocompleteAdapter(this, R.layout.list_item));
		autoCompView.setOnItemClickListener(this);
	}

	public void onItemClick(AdapterView adapterView, View view, int position, long id) {
		String str = (String) adapterView.getItemAtPosition(position);
		Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
	}

	public static ArrayList autocomplete(String input) {
		ArrayList resultList = null;

		HttpURLConnection conn = null;
		StringBuilder jsonResults = new StringBuilder();
		try {
			StringBuilder sb = new StringBuilder(PLACES_API_BASE + TYPE_AUTOCOMPLETE + OUT_JSON);
			sb.append("?key=" + API_KEY);
			sb.append("&components=country:fr");
			sb.append("&input=" + URLEncoder.encode(input, "utf8"));

			URL url = new URL(sb.toString());
			conn = (HttpURLConnection) url.openConnection();
			InputStreamReader in = new InputStreamReader(conn.getInputStream());

			// Load the results into a StringBuilder
			int read;
			char[] buff = new char[1024];
			while ((read = in.read(buff)) != -1) {
				jsonResults.append(buff, 0, read);
			}
		} catch (MalformedURLException e) {
			Log.e(LOG_TAG, "Error processing Places API URL", e);
			return resultList;
		} catch (IOException e) {
			Log.e(LOG_TAG, "Error connecting to Places API", e);
			return resultList;
		} finally {
			if (conn != null) {
				conn.disconnect();
			}
		}

		try {			
			// Create a JSON object hierarchy from the results
			JSONObject jsonObj = new JSONObject(jsonResults.toString());
			JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

			// Extract the Place descriptions from the results
			resultList = new ArrayList(predsJsonArray.length());
			for (int i = 0; i < predsJsonArray.length(); i++) {
				System.out.println(predsJsonArray.getJSONObject(i).getString("description"));
				System.out.println("============================================================");
				resultList.add(predsJsonArray.getJSONObject(i).getString("description"));
			}
		} catch (JSONException e) {
			Log.e(LOG_TAG, "Cannot process JSON results", e);
		}

		return resultList;
	}

	class GooglePlacesAutocompleteAdapter extends ArrayAdapter implements Filterable {
		private ArrayList resultList;

		public GooglePlacesAutocompleteAdapter(Context context, int textViewResourceId) {
			super(context, textViewResourceId);
		}

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

		@Override
		public String getItem(int index) {
			return (String) resultList.get(index);
		}

		@Override
		public Filter getFilter() {
			Filter filter = new Filter() {
				@Override
				protected FilterResults performFiltering(CharSequence constraint) {
					FilterResults filterResults = new FilterResults();
					if (constraint != null) {
						// Retrieve the autocomplete results.
						resultList = autocomplete(constraint.toString());

						// Assign the data to the FilterResults
						filterResults.values = resultList;
						filterResults.count = resultList.size();
					}
					return filterResults;
				}

				@Override
				protected void publishResults(CharSequence constraint, FilterResults results) {
					if (results != null && results.count > 0) {
						notifyDataSetChanged();
					} else {
						notifyDataSetInvalidated();
					}
				}
			};
			return filter;
		}
	}
}