content: package com.comphenix.protocol.metrics;
  
  import org.bukkit.Bukkit;
  import org.bukkit.configuration.file.YamlConfiguration;
  import org.bukkit.entity.Player;
  import org.bukkit.plugin.Plugin;
  import org.bukkit.plugin.RegisteredServiceProvider;
  import org.bukkit.plugin.ServicePriority;
  import org.json.simple.JSONArray;
  import org.json.simple.JSONObject;
  
  import javax.net.ssl.HttpsURLConnection;
  import java.io.ByteArrayOutputStream;
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.lang.reflect.Method;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.util.*;
  import java.util.concurrent.Callable;
  import java.util.logging.Level;
  import java.util.zip.GZIPOutputStream;
  
  /**
   * bStats collects some data for plugin authors.
   *
   * Check out https://bStats.org/ to learn more about bStats!
   */
  public class Metrics {
  
      static {
          // You can use the property to disable the check in your test environment
          if (System.getProperty("bstats.relocatecheck") == null || !System.getProperty("bstats.relocatecheck").equals("false")) {
              // Maven's Relocate is clever and changes strings, too. So we have to use this little "trick" ... :D
              final String defaultPackage = new String(
                      new byte[]{'o', 'r', 'g', '.', 'b', 's', 't', 'a', 't', 's', '.', 'b', 'u', 'k', 'k', 'i', 't'});
              final String examplePackage = new String(new byte[]{'y', 'o', 'u', 'r', '.', 'p', 'a', 'c', 'k', 'a', 'g', 'e'});
              // We want to make sure nobody just copy & pastes the example and use the wrong package names
              if (Metrics.class.getPackage().getName().equals(defaultPackage) || Metrics.class.getPackage().getName().equals(examplePackage)) {
                  throw new IllegalStateException("bStats Metrics class has not been relocated correctly!");
              }
          }
      }
  
      // The version of this bStats class
      public static final int B_STATS_VERSION = 1;
  
      // The url to which the data is sent
      private static final String URL = "https://bStats.org/submitData/bukkit";
  
      // Should failed requests be logged?
      private static boolean logFailedRequests;
  
      // The uuid of the server
      private static String serverUUID;
  
      // The plugin
      private final Plugin plugin;
  
      // A list with all custom charts
      private final List<CustomChart> charts = new ArrayList<>();
  
      /**
       * Class constructor.
       *
       * @param plugin The plugin which stats should be submitted.
       */
      public Metrics(Plugin plugin) {
          if (plugin == null) {
              throw new IllegalArgumentException("Plugin cannot be null!");
          }
          this.plugin = plugin;
  
          // Get the config file
          File bStatsFolder = new File(plugin.getDataFolder().getParentFile(), "bStats");
          File configFile = new File(bStatsFolder, "config.yml");
          YamlConfiguration config = YamlConfiguration.loadConfiguration(configFile);
  
          // Check if the config file exists
          if (!config.isSet("serverUuid")) {
  
              // Add default values
              config.addDefault("enabled", true);
              // Every server gets it's unique random id.
              config.addDefault("serverUuid", UUID.randomUUID().toString());
              // Should failed request be logged?
              config.addDefault("logFailedRequests", false);
  
              // Inform the server owners about bStats
              config.options().header(
                      "bStats collects some data for plugin authors like how many servers are using their plugins.\n" +
                              "To honor their work, you should not disable it.\n" +
                              "This has nearly no effect on the server performance!\n" +
                              "Check out https://bStats.org/ to learn more :)"
              ).copyDefaults(true);
              try {
                  config.save(configFile);
              } catch (IOException ignored) { }
          }
  
          // Load the data
          serverUUID = config.getString("serverUuid");
          logFailedRequests = config.getBoolean("logFailedRequests", false);
          if (config.getBoolean("enabled", true)) {
              boolean found = false;
              // Search for all other bStats Metrics classes to see if we are the first one
              for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
                  try {
                      service.getField("B_STATS_VERSION"); // Our identifier :)
                      found = true; // We aren't the first
                      break;
                  } catch (NoSuchFieldException ignored) { }
              }
              // Register our service
              Bukkit.getServicesManager().register(Metrics.class, this, plugin, ServicePriority.Normal);
              if (!found) {
                  // We are the first!
                  startSubmitting();
              }
          }
      }
  
      void logFailedRequests(boolean value) {
          logFailedRequests = value;
      }
  
      /**
       * Adds a custom chart.
       *
       * @param chart The chart to add.
       */
      public void addCustomChart(CustomChart chart) {
          if (chart == null) {
              throw new IllegalArgumentException("Chart cannot be null!");
          }
          charts.add(chart);
      }
  
      /**
       * Starts the Scheduler which submits our data every 30 minutes.
       */
      private void startSubmitting() {
          final Timer timer = new Timer(true); // We use a timer cause the Bukkit scheduler is affected by server lags
          timer.scheduleAtFixedRate(new TimerTask() {
              @Override
              public void run() {
                  if (!plugin.isEnabled()) { // Plugin was disabled
                      timer.cancel();
                      return;
                  }
                  // Nevertheless we want our code to run in the Bukkit main thread, so we have to use the Bukkit scheduler
                  // Don't be afraid! The connection to the bStats server is still async, only the stats collection is sync ;)
                  Bukkit.getScheduler().runTask(plugin, Metrics.this::submitData);
              }
          }, 1000L * 60 * 5, 1000L * 60 * 30);
          // Submit the data every 30 minutes, first time after 5 minutes to give other plugins enough time to start
          // WARNING: Changing the frequency has no effect but your plugin WILL be blocked/deleted!
          // WARNING: Just don't do it!
      }
  
      /**
       * Gets the plugin specific data.
       * This method is called using Reflection.
       *
       * @return The plugin specific data.
       */
      public JSONObject getPluginData() {
          JSONObject data = new JSONObject();
  
          String pluginName = plugin.getDescription().getName();
          String pluginVersion = Statistics.getVersion(); // ProtocolLib - remove build number
  
          data.put("pluginName", pluginName); // Append the name of the plugin
          data.put("pluginVersion", pluginVersion); // Append the version of the plugin
          JSONArray customCharts = new JSONArray();
          for (CustomChart customChart : charts) {
              // Add the data of the custom charts
              JSONObject chart = customChart.getRequestJsonObject();
              if (chart == null) { // If the chart is null, we skip it
                  continue;
              }
              customCharts.add(chart);
          }
          data.put("customCharts", customCharts);
  
          return data;
      }
  
      /**
       * Gets the server specific data.
       *
       * @return The server specific data.
       */
      private JSONObject getServerData() {
          // Minecraft specific data
          int playerAmount;
          try {
              // Around MC 1.8 the return type was changed to a collection from an array,
              // This fixes java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()Ljava/util/Collection;
              Method onlinePlayersMethod = Class.forName("org.bukkit.Server").getMethod("getOnlinePlayers");
              playerAmount = onlinePlayersMethod.getReturnType().equals(Collection.class)
                      ? ((Collection<?>) onlinePlayersMethod.invoke(Bukkit.getServer())).size()
                      : ((Player[]) onlinePlayersMethod.invoke(Bukkit.getServer())).length;
          } catch (Exception e) {
              playerAmount = Bukkit.getOnlinePlayers().size(); // Just use the new method if the Reflection failed
          }
          int onlineMode = Bukkit.getOnlineMode() ? 1 : 0;
          String bukkitVersion = org.bukkit.Bukkit.getVersion();
          bukkitVersion = bukkitVersion.substring(bukkitVersion.indexOf("MC: ") + 4, bukkitVersion.length() - 1);
  
          // OS/Java specific data
          String javaVersion = System.getProperty("java.version");
          String osName = System.getProperty("os.name");
          String osArch = System.getProperty("os.arch");
          String osVersion = System.getProperty("os.version");
          int coreCount = Runtime.getRuntime().availableProcessors();
  
          JSONObject data = new JSONObject();
  
          data.put("serverUUID", serverUUID);
  
          data.put("playerAmount", playerAmount);
          data.put("onlineMode", onlineMode);
          data.put("bukkitVersion", bukkitVersion);
  
          data.put("javaVersion", javaVersion);
          data.put("osName", osName);
          data.put("osArch", osArch);
          data.put("osVersion", osVersion);
          data.put("coreCount", coreCount);
  
          return data;
      }
  
      /**
       * Collects the data and sends it afterwards.
       */
      private void submitData() {
          final JSONObject data = getServerData();
  
          JSONArray pluginData = new JSONArray();
          // Search for all other bStats Metrics classes to get their plugin data
          for (Class<?> service : Bukkit.getServicesManager().getKnownServices()) {
              try {
                  service.getField("B_STATS_VERSION"); // Our identifier :)
  
                  for (RegisteredServiceProvider<?> provider : Bukkit.getServicesManager().getRegistrations(service)) {
                      try {
                          pluginData.add(provider.getService().getMethod("getPluginData").invoke(provider.getProvider()));
                      } catch (Throwable ignored) { }
                  }
              } catch (Throwable ignored) { }
          }
  
          data.put("plugins", pluginData);
  
          // Create a new thread for the connection to the bStats server
          new Thread(() -> {
              try {
                  // Send the data
                  sendData(data);
              } catch (Exception e) {
                  // Something went wrong! :(
                  if (logFailedRequests) {
                      plugin.getLogger().log(Level.WARNING, "Could not submit plugin stats of " + plugin.getName(), e);
                  }
              }
          }).start();
      }
  
      /**
       * Sends the data to the bStats server.
       *
       * @param data The data to send.
       * @throws Exception If the request failed.
       */
      private static void sendData(JSONObject data) throws Exception {
          if (data == null) {
              throw new IllegalArgumentException("Data cannot be null!");
          }
          if (Bukkit.isPrimaryThread()) {
              throw new IllegalAccessException("This method must not be called from the main thread!");
          }
          HttpsURLConnection connection = (HttpsURLConnection) new URL(URL).openConnection();
  
          // Compress the data to save bandwidth
          byte[] compressedData = compress(data.toString());
  
          // Add headers
          connection.setRequestMethod("POST");
          connection.addRequestProperty("Accept", "application/json");
          connection.addRequestProperty("Connection", "close");
          connection.addRequestProperty("Content-Encoding", "gzip"); // We gzip our request
          connection.addRequestProperty("Content-Length", String.valueOf(compressedData.length));
          connection.setRequestProperty("Content-Type", "application/json"); // We send our data in JSON format
          connection.setRequestProperty("User-Agent", "MC-Server/" + B_STATS_VERSION);
  
          // Send data
          connection.setDoOutput(true);
          DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
          outputStream.write(compressedData);
          outputStream.flush();
          outputStream.close();
  
          connection.getInputStream().close(); // We don't care about the response - Just send our data :)
      }
  
      /**
       * Gzips the given String.
       *
       * @param str The string to gzip.
       * @return The gzipped String.
       * @throws IOException If the compression failed.
       */
      private static byte[] compress(final String str) throws IOException {
          if (str == null) {
              return null;
          }
          ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
          GZIPOutputStream gzip = new GZIPOutputStream(outputStream);
          gzip.write(str.getBytes(StandardCharsets.UTF_8));
          gzip.close();
          return outputStream.toByteArray();
      }
  
      /**
       * Represents a custom chart.
       */
      public static abstract class CustomChart {
  
          // The id of the chart
          final String chartId;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           */
          CustomChart(String chartId) {
              if (chartId == null || chartId.isEmpty()) {
                  throw new IllegalArgumentException("ChartId cannot be null or empty!");
              }
              this.chartId = chartId;
          }
  
          private JSONObject getRequestJsonObject() {
              JSONObject chart = new JSONObject();
              chart.put("chartId", chartId);
              try {
                  JSONObject data = getChartData();
                  if (data == null) {
                      // If the data is null we don't send the chart.
                      return null;
                  }
                  chart.put("data", data);
              } catch (Throwable t) {
                  if (logFailedRequests) {
                      Bukkit.getLogger().log(Level.WARNING, "Failed to get data for custom chart with id " + chartId, t);
                  }
                  return null;
              }
              return chart;
          }
  
          protected abstract JSONObject getChartData() throws Exception;
  
      }
  
      /**
       * Represents a custom simple pie.
       */
      public static class SimplePie extends CustomChart {
  
          private final Callable<String> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public SimplePie(String chartId, Callable<String> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              String value = callable.call();
              if (value == null || value.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              data.put("value", value);
              return data;
          }
      }
  
      /**
       * Represents a custom advanced pie.
       */
      public static class AdvancedPie extends CustomChart {
  
          private final Callable<Map<String, Integer>> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public AdvancedPie(String chartId, Callable<Map<String, Integer>> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              JSONObject values = new JSONObject();
              Map<String, Integer> map = callable.call();
              if (map == null || map.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              boolean allSkipped = true;
              for (Map.Entry<String, Integer> entry : map.entrySet()) {
                  if (entry.getValue() == 0) {
                      continue; // Skip this invalid
                  }
                  allSkipped = false;
                  values.put(entry.getKey(), entry.getValue());
              }
              if (allSkipped) {
                  // Null = skip the chart
                  return null;
              }
              data.put("values", values);
              return data;
          }
      }
  
      /**
       * Represents a custom drilldown pie.
       */
      public static class DrilldownPie extends CustomChart {
  
          private final Callable<Map<String, Map<String, Integer>>> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public DrilldownPie(String chartId, Callable<Map<String, Map<String, Integer>>> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          public JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              JSONObject values = new JSONObject();
              Map<String, Map<String, Integer>> map = callable.call();
              if (map == null || map.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              boolean reallyAllSkipped = true;
              for (Map.Entry<String, Map<String, Integer>> entryValues : map.entrySet()) {
                  JSONObject value = new JSONObject();
                  boolean allSkipped = true;
                  for (Map.Entry<String, Integer> valueEntry : map.get(entryValues.getKey()).entrySet()) {
                      value.put(valueEntry.getKey(), valueEntry.getValue());
                      allSkipped = false;
                  }
                  if (!allSkipped) {
                      reallyAllSkipped = false;
                      values.put(entryValues.getKey(), value);
                  }
              }
              if (reallyAllSkipped) {
                  // Null = skip the chart
                  return null;
              }
              data.put("values", values);
              return data;
          }
      }
  
      /**
       * Represents a custom single line chart.
       */
      public static class SingleLineChart extends CustomChart {
  
          private final Callable<Integer> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public SingleLineChart(String chartId, Callable<Integer> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              int value = callable.call();
              if (value == 0) {
                  // Null = skip the chart
                  return null;
              }
              data.put("value", value);
              return data;
          }
  
      }
  
      /**
       * Represents a custom multi line chart.
       */
      public static class MultiLineChart extends CustomChart {
  
          private final Callable<Map<String, Integer>> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public MultiLineChart(String chartId, Callable<Map<String, Integer>> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              JSONObject values = new JSONObject();
              Map<String, Integer> map = callable.call();
              if (map == null || map.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              boolean allSkipped = true;
              for (Map.Entry<String, Integer> entry : map.entrySet()) {
                  if (entry.getValue() == 0) {
                      continue; // Skip this invalid
                  }
                  allSkipped = false;
                  values.put(entry.getKey(), entry.getValue());
              }
              if (allSkipped) {
                  // Null = skip the chart
                  return null;
              }
              data.put("values", values);
              return data;
          }
  
      }
  
      /**
       * Represents a custom simple bar chart.
       */
      public static class SimpleBarChart extends CustomChart {
  
          private final Callable<Map<String, Integer>> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public SimpleBarChart(String chartId, Callable<Map<String, Integer>> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              JSONObject values = new JSONObject();
              Map<String, Integer> map = callable.call();
              if (map == null || map.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              for (Map.Entry<String, Integer> entry : map.entrySet()) {
                  JSONArray categoryValues = new JSONArray();
                  categoryValues.add(entry.getValue());
                  values.put(entry.getKey(), categoryValues);
              }
              data.put("values", values);
              return data;
          }
  
      }
  
      /**
       * Represents a custom advanced bar chart.
       */
      public static class AdvancedBarChart extends CustomChart {
  
          private final Callable<Map<String, int[]>> callable;
  
          /**
           * Class constructor.
           *
           * @param chartId The id of the chart.
           * @param callable The callable which is used to request the chart data.
           */
          public AdvancedBarChart(String chartId, Callable<Map<String, int[]>> callable) {
              super(chartId);
              this.callable = callable;
          }
  
          @Override
          protected JSONObject getChartData() throws Exception {
              JSONObject data = new JSONObject();
              JSONObject values = new JSONObject();
              Map<String, int[]> map = callable.call();
              if (map == null || map.isEmpty()) {
                  // Null = skip the chart
                  return null;
              }
              boolean allSkipped = true;
              for (Map.Entry<String, int[]> entry : map.entrySet()) {
                  if (entry.getValue().length == 0) {
                      continue; // Skip this invalid
                  }
                  allSkipped = false;
                  JSONArray categoryValues = new JSONArray();
                  for (int categoryValue : entry.getValue()) {
                      categoryValues.add(categoryValue);
                  }
                  values.put(entry.getKey(), categoryValues);
              }
              if (allSkipped) {
                  // Null = skip the chart
                  return null;
              }
              data.put("values", values);
              return data;
          }
  
      }
  }
  