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package cgeo.geocaching.go4cache;
import cgeo.geocaching.Parameters;
import cgeo.geocaching.Settings;
import cgeo.geocaching.cgBase;
import cgeo.geocaching.cgeoapplication;
import cgeo.geocaching.geopoint.Geopoint;
import cgeo.geocaching.geopoint.GeopointFormatter.Format;
import cgeo.geocaching.geopoint.Viewport;
import cgeo.geocaching.utils.CryptUtils;
import org.apache.commons.lang3.StringUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
/**
*
* Thread to send location information to go4cache.com. The singleton will be created
* only if, at any time, the user opts in to send this information. Then the same thread
* will take care of sending updated positions when available.
*
*/
public final class Go4Cache extends Thread {
private static class InstanceHolder { // initialization on demand holder
private static final Go4Cache INSTANCE = new Go4Cache();
}
private final static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); // 2010-07-25 14:44:01
final private ArrayBlockingQueue<Geopoint> queue = new ArrayBlockingQueue<Geopoint>(1);
public static Go4Cache getInstance() { // no need to be synchronized
return InstanceHolder.INSTANCE;
}
private Go4Cache() { // private singleton constructor
super("Go4Cache");
setPriority(Thread.MIN_PRIORITY);
start();
}
/**
* Send the coordinates to go4cache.com if the user opted in to do so.
*
* @param app
* the current application
* @param coords
* the current coordinates
*/
public static void signalCoordinates(final Geopoint coords) {
if (Settings.isPublicLoc()) {
getInstance().queue.offer(coords);
}
}
@Override
public void run() {
Log.d(Settings.tag, "Go4Cache task started");
Geopoint latestCoords = null;
String latestAction = null;
try {
for (;;) {
final Geopoint currentCoords = queue.take();
final String currentAction = cgeoapplication.getInstance().getAction();
// If we are too close and we haven't changed our current action, no need
// to update our situation.
if (null != latestCoords && latestCoords.distanceTo(currentCoords) < 0.75 && StringUtils.equals(latestAction, currentAction)) {
continue;
}
final String username = Settings.getUsername();
if (StringUtils.isBlank(username)) {
continue;
}
final String latStr = currentCoords.format(Format.LAT_DECDEGREE_RAW);
final String lonStr = currentCoords.format(Format.LON_DECDEGREE_RAW);
final Parameters params = new Parameters(
"u", username,
"lt", latStr,
"ln", lonStr,
"a", currentAction,
"s", (CryptUtils.sha1(username + "|" + latStr + "|" + lonStr + "|" + currentAction + "|" + CryptUtils.md5("carnero: developing your dreams"))).toLowerCase());
if (null != cgBase.version) {
params.put("v", cgBase.version);
}
cgBase.postRequest("http://api.go4cache.com/", params);
// Update our coordinates even if the request was not successful, as not to hammer the server
// with invalid requests for every new GPS position.
latestCoords = currentCoords;
latestAction = currentAction;
}
} catch (InterruptedException e) {
Log.e(Settings.tag, "Go4Cache.run: interrupted", e);
}
}
/**
* Return an immutable list of users present in the given viewport.
*
* @param username
* the current username
* @param viewport
* the current viewport
* @return the list of users present in the viewport
*/
public static List<Go4CacheUser> getGeocachersInViewport(final String username, final Viewport viewport) {
final List<Go4CacheUser> users = new ArrayList<Go4CacheUser>();
if (null == username) {
return users;
}
final Parameters params = new Parameters(
"u", username,
"ltm", viewport.bottomLeft.format(Format.LAT_DECDEGREE_RAW),
"ltx", viewport.topRight.format(Format.LAT_DECDEGREE_RAW),
"lnm", viewport.bottomLeft.format(Format.LON_DECDEGREE_RAW),
"lnx", viewport.topRight.format(Format.LON_DECDEGREE_RAW));
final String data = cgBase.getResponseData(cgBase.postRequest("http://api.go4cache.com/get.php", params));
if (StringUtils.isBlank(data)) {
Log.e(Settings.tag, "cgeoBase.getGeocachersInViewport: No data from server");
return null;
}
try {
final JSONArray usersData = new JSONObject(data).getJSONArray("users");
final int count = usersData.length();
for (int i = 0; i < count; i++) {
final JSONObject oneUser = usersData.getJSONObject(i);
users.add(parseUser(oneUser));
}
} catch (Exception e) {
Log.e(Settings.tag, "cgBase.getGeocachersInViewport: " + e.toString());
}
return Collections.unmodifiableList(users);
}
/**
* Parse user information from go4cache.com.
*
* @param user
* a JSON object
* @return a cgCache user filled with information
* @throws JSONException
* if JSON could not be parsed correctly
* @throws ParseException
* if the date could not be parsed as expected
*/
private static Go4CacheUser parseUser(final JSONObject user) throws JSONException, ParseException {
final Date date = dateFormat.parse(user.getString("located"));
final String username = user.getString("user");
final Geopoint coords = new Geopoint(user.getDouble("latitude"), user.getDouble("longitude"));
final String action = user.getString("action");
final String client = user.getString("client");
return new Go4CacheUser(username, coords, date, action, client);
}
}
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