Implement advanced online players chart (#210)

* Implement advanced online players chart

* Implement test

* Document function

VoxelSniperSpigot/src/main/java/com/github/kevindagame/voxelsniper/SpigotVoxelSniper.java

@@ -14,6 +14,7 @@
 import com.github.kevindagame.voxelsniper.fileHandler.VoxelSniperConfiguration;
 import com.github.kevindagame.voxelsniper.integration.bstats.BrushUsageCounter;
 import com.github.kevindagame.voxelsniper.integration.bstats.BrushUsersCounter;
+import com.github.kevindagame.voxelsniper.integration.bstats.ServerSizeCategoryCounter;
 import com.github.kevindagame.voxelsniper.integration.plotsquared.PlotSquaredIntegration;
 import com.github.kevindagame.voxelsniper.integration.worldguard.WorldGuardIntegration;
 import com.github.kevindagame.voxelsniper.material.SpigotMaterial;
@@ -24,6 +25,7 @@
 import com.github.kevindagame.voxelsniper.world.SpigotWorld;
 import net.kyori.adventure.platform.bukkit.BukkitAudiences;
 import org.bstats.bukkit.Metrics;
+import org.bstats.charts.DrilldownPie;
 import org.bstats.charts.SimplePie;
 import org.bstats.charts.SingleLineChart;
 import org.bukkit.*;
@@ -112,8 +114,8 @@ public void onEnable() {
         metrics.addCustomChart(new SimplePie("worldguard_integration", () -> WorldGuardIntegration.Companion.getEnabled() ? "enabled" : "disabled"));
         metrics.addCustomChart(new SimplePie("plotsquared_integration", () -> PlotSquaredIntegration.Companion.getEnabled() ? "enabled" : "disabled"));
         metrics.addCustomChart(new SingleLineChart("total_brush_uses_in_last_30_minutes", BrushUsageCounter::getTotalBrushUses));
-//        metrics.addCustomChart(new Metrics.MultiLineChart("uses_per_brush", BrushUsageCounter::getUsagePerBrush));
         metrics.addCustomChart(new SingleLineChart("total_snipers", BrushUsersCounter.Companion::getTotalBrushUses));
+        metrics.addCustomChart(new DrilldownPie("server_size_category_counter", () -> ServerSizeCategoryCounter.INSTANCE.getData(getServer().getOnlinePlayers().size())));
 
         // Do update check
         if (voxelSniperConfiguration.isUpdateCheckerEnabled()) {

VoxelSniperSpigot/src/main/java/com/github/kevindagame/voxelsniper/integration/bstats/ServerSizeCategoryCounter.kt

@@ -0,0 +1,35 @@
+package com.github.kevindagame.voxelsniper.integration.bstats
+
+object ServerSizeCategoryCounter {
+    private val categories = listOf(
+        ServerSizeCategory("0", 0, 0),
+        ServerSizeCategory("1-10", 1, 10),
+        ServerSizeCategory("11-20", 11, 20),
+        ServerSizeCategory("21-50", 21, 50),
+        ServerSizeCategory("51-100", 51, 100),
+        ServerSizeCategory("101-200", 101, 200),
+        ServerSizeCategory("201-500", 201, 500),
+        ServerSizeCategory("501-1000", 501, 1000),
+        ServerSizeCategory("More than 1000", 1001, Int.MAX_VALUE),
+
+
+    )
+
+    /**
+     * Gets the data for the server size category chart.
+     * @param playerCount The amount of players online on the server.
+     * @return The data for the server size category chart.
+     * The data consists of a map with the label of the category, and a map with the exact value. The bstats docs do not explain the hardcoded 1. I assume this means that it's either 1 deep or a weight of 1
+     */
+    fun getData(playerCount: Int): Map<String, Map<String, Int>> {
+        val map = mutableMapOf<String, Map<String, Int>>()
+        val entries = mutableMapOf<String, Int>()
+        val category = categories.find { playerCount in it.min..it.max }
+        entries[playerCount.toString()] = 1
+        map[category!!.label] = entries
+
+        return map
+    }
+}
+
+data class ServerSizeCategory(val label: String, val min: Int, val max: Int)

VoxelSniperSpigot/src/test/java/com/github/kevindagame/voxelsniper/integration/bstats/ServerSizeCategoryCounterTest.kt

@@ -0,0 +1,28 @@
+package com.github.kevindagame.voxelsniper.integration.bstats
+
+import org.junit.Assert
+import org.junit.Test
+
+class ServerSizeCategoryCounterTest {
+
+    @Test
+    fun testGetData() {
+        val testData = listOf(
+            0 to "0",
+            5 to "1-10",
+            15 to "11-20",
+            30 to "21-50",
+            75 to "51-100",
+            150 to "101-200",
+            300 to "201-500",
+            750 to "501-1000",
+            2000 to "More than 1000"
+        )
+
+        for ((playerCount, expectedCategory) in testData) {
+            val result = ServerSizeCategoryCounter.getData(playerCount)
+            val categoryMap = result[expectedCategory]
+            Assert.assertEquals(1, categoryMap?.get(playerCount.toString()))
+        }
+    }
+}