first commit

.gitignore

@@ -0,0 +1,5 @@
+.gradle
+.idea
+build
+gradle
+run

README.md

@@ -0,0 +1,44 @@
+# FallSMP-Rewards
+
+Kill-based quest rewards plugin for Paper 1.21.
+
+## Features
+
+- Configurable player-kill milestone quests in `config.yml`
+- Item rewards per quest (example format: `DIAMOND:3`)
+- 3x3 GUI (`/rewards`) with:
+  - `CHEST` icon when claimable
+  - `MINECART` icon when not claimable
+  - detailed lore for quest text + progress + rewards
+- JSON player progress storage in `plugins/FallSMP-Rewards/playerdata/<uuid>.json`
+- Per killer-victim cooldown for counted kills (default 10 minutes)
+- Sound effects for open, progress, unlocked, claim, and denied actions
+
+## Command
+
+- `/rewards` - Opens the rewards GUI
+- `/rewards reload` - Reloads plugin config and quest definitions (`fallsmprewards.reload`)
+
+## Configure quests
+
+Edit `src/main/resources/config.yml` (or generated plugin config):
+
+```yml
+kill-count-cooldown-minutes: 10
+
+quests:
+  hunter_1:
+    required-kills: 5
+    title: "&aHunter I"
+    description:
+      - "&7Kill 5 players in total."
+    rewards:
+      - "IRON_INGOT:16"
+      - "GOLDEN_APPLE:1"
+```
+
+## Build
+
+```powershell
+./gradlew.bat build
+```

build.gradle

@@ -0,0 +1,56 @@
+plugins {
+    id 'java'
+    id("xyz.jpenilla.run-paper") version "2.3.1"
+}
+
+group = 'de.winniepat'
+version = '1.1'
+
+repositories {
+    mavenCentral()
+    maven {
+        name = "papermc-repo"
+        url = "https://repo.papermc.io/repository/maven-public/"
+    }
+}
+
+dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.21.11-R0.1-SNAPSHOT")
+    compileOnly("com.google.code.gson:gson:2.11.0")
+}
+
+tasks {
+    runServer {
+        // Configure the Minecraft version for our task.
+        // This is the only required configuration besides applying the plugin.
+        // Your plugin's jar (or shadowJar if present) will be used automatically.
+        minecraftVersion("1.21.11")
+    }
+}
+
+def targetJavaVersion = 21
+java {
+    def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+    sourceCompatibility = javaVersion
+    targetCompatibility = javaVersion
+    if (JavaVersion.current() < javaVersion) {
+        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+
+    if (targetJavaVersion >= 10 || JavaVersion.current().isJava10Compatible()) {
+        options.release.set(targetJavaVersion)
+    }
+}
+
+processResources {
+    def props = [version: version]
+    inputs.properties props
+    filteringCharset 'UTF-8'
+    filesMatching('plugin.yml') {
+        expand props
+    }
+}

gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'FallSMP-Rewards'

src/main/java/de/winniepat/fallSMPRewards/FallSMPRewards.java

@@ -0,0 +1,40 @@
+package de.winniepat.fallSMPRewards;
+
+import de.winniepat.fallSMPRewards.command.RewardsCommand;
+import de.winniepat.fallSMPRewards.gui.RewardsGui;
+import de.winniepat.fallSMPRewards.listener.QuestListener;
+import de.winniepat.fallSMPRewards.service.QuestService;
+import de.winniepat.fallSMPRewards.storage.PlayerDataStore;
+import java.util.Objects;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class FallSMPRewards extends JavaPlugin {
+
+    private QuestService questService;
+    private PlayerDataStore playerDataStore;
+    private RewardsGui rewardsGui;
+
+    @Override
+    public void onEnable() {
+        saveDefaultConfig();
+
+        questService = new QuestService(this);
+        questService.reload();
+
+        playerDataStore = new PlayerDataStore(this);
+        rewardsGui = new RewardsGui(this, questService, playerDataStore);
+
+        getServer().getPluginManager().registerEvents(new QuestListener(this, questService, playerDataStore, rewardsGui), this);
+        Objects.requireNonNull(getCommand("rewards"), "rewards command missing in plugin.yml").setExecutor(new RewardsCommand(this, rewardsGui, questService));
+
+        getLogger().info("Enabled with " + questService.getQuests().size() + " kill quests.");
+    }
+
+    @Override
+    public void onDisable() {
+        if (playerDataStore != null) {
+            playerDataStore.flush();
+        }
+        getLogger().info("Disabled");
+    }
+}

src/main/java/de/winniepat/fallSMPRewards/command/RewardsCommand.java

@@ -0,0 +1,59 @@
+package de.winniepat.fallSMPRewards.command;
+
+import de.winniepat.fallSMPRewards.FallSMPRewards;
+import de.winniepat.fallSMPRewards.gui.RewardsGui;
+import de.winniepat.fallSMPRewards.service.QuestService;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public final class RewardsCommand implements CommandExecutor {
+
+    private static final String USE_PERMISSION = "fallsmprewards.use";
+    private static final String RELOAD_PERMISSION = "fallsmprewards.reload";
+
+    private final FallSMPRewards plugin;
+    private final RewardsGui rewardsGui;
+    private final QuestService questService;
+
+    public RewardsCommand(FallSMPRewards plugin, RewardsGui rewardsGui, QuestService questService) {
+        this.plugin = plugin;
+        this.rewardsGui = rewardsGui;
+        this.questService = questService;
+    }
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (args.length > 0) {
+            if (args[0].equalsIgnoreCase("reload")) {
+                if (!sender.hasPermission(RELOAD_PERMISSION)) {
+                    sender.sendMessage(ChatColor.RED + "You do not have permission to reload this plugin.");
+                    return true;
+                }
+
+                plugin.reloadConfig();
+                questService.reload();
+                sender.sendMessage(ChatColor.GREEN + "FallSMP-Rewards config reloaded.");
+                return true;
+            }
+
+            sender.sendMessage(ChatColor.RED + "Unknown subcommand. Use /" + label + " or /" + label + " reload");
+            return true;
+        }
+
+        if (!(sender instanceof Player player)) {
+            sender.sendMessage(ChatColor.RED + "Only players can open the rewards GUI. Use /" + label + " reload from console.");
+            return true;
+        }
+
+        if (!sender.hasPermission(USE_PERMISSION)) {
+            sender.sendMessage(ChatColor.RED + "You do not have permission to use this command.");
+            return true;
+        }
+
+        rewardsGui.open(player);
+        return true;
+    }
+}

src/main/java/de/winniepat/fallSMPRewards/gui/RewardsGui.java

@@ -0,0 +1,151 @@
+package de.winniepat.fallSMPRewards.gui;
+
+import de.winniepat.fallSMPRewards.FallSMPRewards;
+import de.winniepat.fallSMPRewards.model.PlayerData;
+import de.winniepat.fallSMPRewards.model.QuestDefinition;
+import de.winniepat.fallSMPRewards.service.QuestService;
+import de.winniepat.fallSMPRewards.storage.PlayerDataStore;
+import java.util.ArrayList;
+import java.util.List;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+
+public final class RewardsGui {
+
+    private final FallSMPRewards plugin;
+    private final QuestService questService;
+    private final PlayerDataStore playerDataStore;
+
+    public RewardsGui(FallSMPRewards plugin, QuestService questService, PlayerDataStore playerDataStore) {
+        this.plugin = plugin;
+        this.questService = questService;
+        this.playerDataStore = playerDataStore;
+    }
+
+    public void open(Player player) {
+        Inventory inventory = Bukkit.createInventory(null, 9, getTitle());
+        PlayerData data = playerDataStore.get(player.getUniqueId());
+        List<QuestDefinition> quests = questService.getQuests();
+
+        for (int slot = 0; slot < Math.min(9, quests.size()); slot++) {
+            QuestDefinition quest = quests.get(slot);
+            inventory.setItem(slot, buildQuestIcon(quest, data));
+        }
+
+        player.openInventory(inventory);
+        player.playSound(player.getLocation(), resolveSound("sounds.open", "block.chest.open"), 1f, 1f);
+    }
+
+    public boolean isRewardsInventoryTitle(String title) {
+        return getTitle().equals(title);
+    }
+
+    public boolean claim(Player player, int slot) {
+        List<QuestDefinition> quests = questService.getQuests();
+        if (slot < 0 || slot >= quests.size() || slot >= 9) {
+            return false;
+        }
+
+        QuestDefinition quest = quests.get(slot);
+        PlayerData data = playerDataStore.get(player.getUniqueId());
+        if (data.hasClaimed(quest.getId()) || data.getTotalKills() < quest.getRequiredKills()) {
+            return false;
+        }
+
+        if (!playerDataStore.claim(player.getUniqueId(), quest.getId())) {
+            return false;
+        }
+
+        for (ItemStack reward : quest.getRewards()) {
+            player.getInventory().addItem(reward).values().forEach(leftover ->
+                    player.getWorld().dropItemNaturally(player.getLocation(), leftover));
+        }
+
+        player.sendMessage(color("&aQuest reward claimed: &f" + quest.getTitle()));
+        player.playSound(player.getLocation(), resolveSound("sounds.claim", "entity.player.levelup"), 1f, 1.1f);
+        open(player);
+        return true;
+    }
+
+    private ItemStack buildQuestIcon(QuestDefinition quest, PlayerData data) {
+        boolean claimed = data.hasClaimed(quest.getId());
+        boolean claimable = !claimed && data.getTotalKills() >= quest.getRequiredKills();
+
+        Material material = claimable ? Material.CHEST_MINECART : Material.MINECART;
+        if (claimed) {
+            material = Material.BARRIER;
+        }
+
+        ItemStack item = new ItemStack(material);
+        ItemMeta meta = item.getItemMeta();
+        if (meta == null) {
+            return item;
+        }
+
+        meta.setDisplayName(quest.getTitle());
+
+        List<String> lore = new ArrayList<>();
+        lore.addAll(quest.getDescription());
+        lore.add("");
+        lore.add(color("&7Progress: &f" + Math.min(data.getTotalKills(), quest.getRequiredKills()) + "&7/&f" + quest.getRequiredKills()));
+        lore.add(color("&7Reward:"));
+        for (ItemStack reward : quest.getRewards()) {
+            lore.add(color("&f- " + reward.getAmount() + "x " + prettify(reward.getType().name())));
+        }
+        lore.add("");
+
+        if (claimed) {
+            lore.add(color("&aAlready claimed"));
+        } else if (claimable) {
+            lore.add(color("&eClick to claim!"));
+        } else {
+            lore.add(color("&cNot claimable yet"));
+        }
+
+        meta.setLore(lore);
+        item.setItemMeta(meta);
+        return item;
+    }
+
+    private String prettify(String text) {
+        String lower = text.toLowerCase().replace('_', ' ');
+        String[] parts = lower.split(" ");
+        StringBuilder builder = new StringBuilder();
+        for (String part : parts) {
+            if (part.isEmpty()) {
+                continue;
+            }
+            if (!builder.isEmpty()) {
+                builder.append(' ');
+            }
+            builder.append(Character.toUpperCase(part.charAt(0))).append(part.substring(1));
+        }
+        return builder.toString();
+    }
+
+    private String getTitle() {
+        return color(plugin.getConfig().getString("gui.title", "&6Kill Rewards"));
+    }
+
+    private String resolveSound(String path, String fallback) {
+        String configured = plugin.getConfig().getString(path, fallback);
+        if (configured == null || configured.isBlank()) {
+            return fallback;
+        }
+        String normalized = configured.trim().toLowerCase();
+        // Support old enum-style names like BLOCK_CHEST_OPEN.
+        if (!normalized.contains(".")) {
+            normalized = normalized.replace('_', '.');
+        }
+        return normalized;
+    }
+
+    private String color(String input) {
+        return ChatColor.translateAlternateColorCodes('&', input);
+    }
+}

src/main/java/de/winniepat/fallSMPRewards/listener/QuestListener.java

@@ -0,0 +1,118 @@
+package de.winniepat.fallSMPRewards.listener;
+
+import de.winniepat.fallSMPRewards.FallSMPRewards;
+import de.winniepat.fallSMPRewards.gui.RewardsGui;
+import de.winniepat.fallSMPRewards.model.PlayerData;
+import de.winniepat.fallSMPRewards.model.QuestDefinition;
+import de.winniepat.fallSMPRewards.service.QuestService;
+import de.winniepat.fallSMPRewards.storage.PlayerDataStore;
+import de.winniepat.fallSMPRewards.storage.PlayerDataStore.KillAddResult;
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.inventory.InventoryClickEvent;
+
+public final class QuestListener implements Listener {
+
+    private final FallSMPRewards plugin;
+    private final QuestService questService;
+    private final PlayerDataStore playerDataStore;
+    private final RewardsGui rewardsGui;
+
+    public QuestListener(FallSMPRewards plugin, QuestService questService, PlayerDataStore playerDataStore, RewardsGui rewardsGui) {
+        this.plugin = plugin;
+        this.questService = questService;
+        this.playerDataStore = playerDataStore;
+        this.rewardsGui = rewardsGui;
+    }
+
+    @EventHandler
+    public void onPlayerDeath(PlayerDeathEvent event) {
+        Player victim = event.getEntity();
+        Player killer = victim.getKiller();
+        if (killer == null || killer.getUniqueId().equals(victim.getUniqueId())) {
+            return;
+        }
+
+        long cooldownMillis = getCooldownMillis();
+        KillAddResult killResult = playerDataStore.addKillWithCooldown(killer.getUniqueId(), victim.getUniqueId(), cooldownMillis);
+        if (!killResult.counted()) {
+            killer.sendMessage(color("&cThis kill does not count for rewards. Kill this player again in &f" + formatDuration(killResult.remainingCooldownMillis()) + "&c."));
+            killer.playSound(killer.getLocation(), resolveSound("sounds.denied", "block.note_block.bass"), 1f, 1f);
+            return;
+        }
+
+        int totalKills = killResult.totalKills();
+        PlayerData data = playerDataStore.get(killer.getUniqueId());
+        boolean unlocked = false;
+        for (QuestDefinition quest : questService.getQuests()) {
+            if (!data.hasClaimed(quest.getId()) && totalKills >= quest.getRequiredKills() && totalKills - 1 < quest.getRequiredKills()) {
+                killer.sendMessage(color("&6Quest ready to claim: &f" + quest.getTitle()));
+                unlocked = true;
+            }
+        }
+
+        if (unlocked) {
+            killer.playSound(killer.getLocation(), resolveSound("sounds.unlocked", "ui.toast.challenge_complete"), 1f, 1f);
+        } else {
+            killer.playSound(killer.getLocation(), resolveSound("sounds.progress", "entity.experience_orb.pickup"), 0.6f, 1.2f);
+        }
+    }
+
+    @EventHandler
+    public void onInventoryClick(InventoryClickEvent event) {
+        if (!rewardsGui.isRewardsInventoryTitle(event.getView().getTitle())) {
+            return;
+        }
+
+        event.setCancelled(true);
+        if (!(event.getWhoClicked() instanceof Player player)) {
+            return;
+        }
+
+        if (event.getClickedInventory() == null || event.getRawSlot() < 0 || event.getRawSlot() >= 9) {
+            return;
+        }
+
+        boolean claimed = rewardsGui.claim(player, event.getRawSlot());
+        if (!claimed) {
+            player.playSound(player.getLocation(), resolveSound("sounds.denied", "block.note_block.bass"), 1f, 1f);
+        }
+    }
+
+    private long getCooldownMillis() {
+        long cooldownMinutes = Math.max(1L, plugin.getConfig().getLong("kill-count-cooldown-minutes", 10L));
+        return cooldownMinutes * 60_000L;
+    }
+
+    private String formatDuration(long remainingMillis) {
+        long totalSeconds = Math.max(1L, (remainingMillis + 999L) / 1000L);
+        long minutes = totalSeconds / 60L;
+        long seconds = totalSeconds % 60L;
+        if (minutes == 0L) {
+            return seconds + "s";
+        }
+        if (seconds == 0L) {
+            return minutes + "m";
+        }
+        return minutes + "m " + seconds + "s";
+    }
+
+    private String resolveSound(String path, String fallback) {
+        String configured = plugin.getConfig().getString(path, fallback);
+        if (configured == null || configured.isBlank()) {
+            return fallback;
+        }
+        String normalized = configured.trim().toLowerCase();
+        if (!normalized.contains(".")) {
+            normalized = normalized.replace('_', '.');
+        }
+        return normalized;
+    }
+
+    private String color(String input) {
+        return ChatColor.translateAlternateColorCodes('&', input);
+    }
+}

src/main/java/de/winniepat/fallSMPRewards/model/PlayerData.java

@@ -0,0 +1,78 @@
+package de.winniepat.fallSMPRewards.model;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+public final class PlayerData {
+
+    private UUID uuid;
+    private int totalKills;
+    private Set<String> claimedQuestIds;
+    private Map<String, Long> lastCountedKillByVictim;
+
+    public PlayerData() {
+        // Required for Gson.
+    }
+
+    public PlayerData(UUID uuid) {
+        this.uuid = uuid;
+        this.totalKills = 0;
+        this.claimedQuestIds = new HashSet<>();
+        this.lastCountedKillByVictim = new HashMap<>();
+    }
+
+    public void sanitize(UUID expectedUuid) {
+        if (uuid == null) {
+            uuid = expectedUuid;
+        }
+        if (claimedQuestIds == null) {
+            claimedQuestIds = new HashSet<>();
+        }
+        if (lastCountedKillByVictim == null) {
+            lastCountedKillByVictim = new HashMap<>();
+        }
+        if (totalKills < 0) {
+            totalKills = 0;
+        }
+    }
+
+    public UUID getUuid() {
+        return uuid;
+    }
+
+    public int getTotalKills() {
+        return totalKills;
+    }
+
+    public int addKill() {
+        totalKills++;
+        return totalKills;
+    }
+
+    public long getRemainingCooldownMillis(UUID victimUuid, long cooldownMillis, long nowMillis) {
+        Long lastCountedMillis = lastCountedKillByVictim.get(victimUuid.toString());
+        if (lastCountedMillis == null) {
+            return 0L;
+        }
+        long elapsed = nowMillis - lastCountedMillis;
+        if (elapsed >= cooldownMillis) {
+            return 0L;
+        }
+        return cooldownMillis - elapsed;
+    }
+
+    public void setLastCountedKill(UUID victimUuid, long nowMillis) {
+        lastCountedKillByVictim.put(victimUuid.toString(), nowMillis);
+    }
+
+    public boolean hasClaimed(String questId) {
+        return claimedQuestIds.contains(questId);
+    }
+
+    public boolean claim(String questId) {
+        return claimedQuestIds.add(questId);
+    }
+}

src/main/java/de/winniepat/fallSMPRewards/model/QuestDefinition.java

@@ -0,0 +1,43 @@
+package de.winniepat.fallSMPRewards.model;
+
+import java.util.Collections;
+import java.util.List;
+import org.bukkit.inventory.ItemStack;
+
+public final class QuestDefinition {
+
+    private final String id;
+    private final String title;
+    private final List<String> description;
+    private final int requiredKills;
+    private final List<ItemStack> rewards;
+
+    public QuestDefinition(String id, String title, List<String> description, int requiredKills, List<ItemStack> rewards) {
+        this.id = id;
+        this.title = title;
+        this.description = List.copyOf(description);
+        this.requiredKills = requiredKills;
+        this.rewards = rewards.stream().map(ItemStack::clone).toList();
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public List<String> getDescription() {
+        return Collections.unmodifiableList(description);
+    }
+
+    public int getRequiredKills() {
+        return requiredKills;
+    }
+
+    public List<ItemStack> getRewards() {
+        return rewards.stream().map(ItemStack::clone).toList();
+    }
+}
+

src/main/java/de/winniepat/fallSMPRewards/service/QuestService.java

@@ -0,0 +1,89 @@
+package de.winniepat.fallSMPRewards.service;
+
+import de.winniepat.fallSMPRewards.FallSMPRewards;
+import de.winniepat.fallSMPRewards.model.QuestDefinition;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import org.bukkit.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.inventory.ItemStack;
+
+public final class QuestService {
+
+    private final FallSMPRewards plugin;
+    private final List<QuestDefinition> quests = new ArrayList<>();
+
+    public QuestService(FallSMPRewards plugin) {
+        this.plugin = plugin;
+    }
+
+    public void reload() {
+        plugin.reloadConfig();
+        quests.clear();
+
+        ConfigurationSection questSection = plugin.getConfig().getConfigurationSection("quests");
+        if (questSection == null) {
+            plugin.getLogger().warning("No quests section found in config.yml");
+            return;
+        }
+
+        for (String questId : questSection.getKeys(false)) {
+            ConfigurationSection section = questSection.getConfigurationSection(questId);
+            if (section == null) {
+                continue;
+            }
+
+            int requiredKills = Math.max(1, section.getInt("required-kills", 1));
+            String title = color(section.getString("title", "&e" + questId));
+            List<String> description = section.getStringList("description").stream().map(this::color).toList();
+            List<ItemStack> rewards = parseRewards(section.getStringList("rewards"));
+
+            if (rewards.isEmpty()) {
+                plugin.getLogger().warning("Quest " + questId + " has no valid rewards and was skipped.");
+                continue;
+            }
+
+            quests.add(new QuestDefinition(questId, title, description, requiredKills, rewards));
+        }
+
+        if (quests.size() > 9) {
+            plugin.getLogger().warning("More than 9 quests configured. GUI shows only the first 9 quests.");
+        }
+    }
+
+    public List<QuestDefinition> getQuests() {
+        return Collections.unmodifiableList(quests);
+    }
+
+    private List<ItemStack> parseRewards(List<String> rawRewards) {
+        List<ItemStack> rewards = new ArrayList<>();
+        for (String raw : rawRewards) {
+            String[] parts = raw.split(":", 2);
+            Material material = Material.matchMaterial(parts[0].trim().toUpperCase());
+            if (material == null || material.isAir()) {
+                plugin.getLogger().warning("Invalid reward material: " + raw);
+                continue;
+            }
+
+            int amount = 1;
+            if (parts.length > 1) {
+                try {
+                    amount = Math.max(1, Integer.parseInt(parts[1].trim()));
+                } catch (NumberFormatException ex) {
+                    plugin.getLogger().warning("Invalid reward amount: " + raw);
+                    continue;
+                }
+            }
+
+            rewards.add(new ItemStack(material, amount));
+        }
+        return rewards;
+    }
+
+    private String color(String input) {
+        return ChatColor.translateAlternateColorCodes('&', input);
+    }
+}
+

src/main/java/de/winniepat/fallSMPRewards/storage/PlayerDataStore.java

@@ -0,0 +1,101 @@
+package de.winniepat.fallSMPRewards.storage;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import de.winniepat.fallSMPRewards.FallSMPRewards;
+import de.winniepat.fallSMPRewards.model.PlayerData;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public final class PlayerDataStore {
+
+    public record KillAddResult(boolean counted, int totalKills, long remainingCooldownMillis) {
+    }
+
+    private final FallSMPRewards plugin;
+    private final Gson gson;
+    private final Path dataDirectory;
+    private final Map<UUID, PlayerData> cache = new HashMap<>();
+
+    public PlayerDataStore(FallSMPRewards plugin) {
+        this.plugin = plugin;
+        this.gson = new GsonBuilder().setPrettyPrinting().create();
+        this.dataDirectory = plugin.getDataFolder().toPath().resolve("playerdata");
+
+        try {
+            Files.createDirectories(dataDirectory);
+        } catch (IOException ex) {
+            throw new IllegalStateException("Could not create player data directory", ex);
+        }
+    }
+
+    public PlayerData get(UUID uuid) {
+        return cache.computeIfAbsent(uuid, this::load);
+    }
+
+    public KillAddResult addKillWithCooldown(UUID killerUuid, UUID victimUuid, long cooldownMillis) {
+        PlayerData data = get(killerUuid);
+        long nowMillis = System.currentTimeMillis();
+        long remainingCooldownMillis = data.getRemainingCooldownMillis(victimUuid, cooldownMillis, nowMillis);
+        if (remainingCooldownMillis > 0L) {
+            return new KillAddResult(false, data.getTotalKills(), remainingCooldownMillis);
+        }
+
+        data.setLastCountedKill(victimUuid, nowMillis);
+        int totalKills = data.addKill();
+        save(killerUuid, data);
+        return new KillAddResult(true, totalKills, 0L);
+    }
+
+    public boolean claim(UUID uuid, String questId) {
+        PlayerData data = get(uuid);
+        boolean claimed = data.claim(questId);
+        if (claimed) {
+            save(uuid, data);
+        }
+        return claimed;
+    }
+
+    public void flush() {
+        for (Map.Entry<UUID, PlayerData> entry : cache.entrySet()) {
+            save(entry.getKey(), entry.getValue());
+        }
+    }
+
+    private PlayerData load(UUID uuid) {
+        Path file = getPath(uuid);
+        if (!Files.exists(file)) {
+            return new PlayerData(uuid);
+        }
+
+        try {
+            String json = Files.readString(file);
+            PlayerData data = gson.fromJson(json, PlayerData.class);
+            if (data == null) {
+                return new PlayerData(uuid);
+            }
+            data.sanitize(uuid);
+            return data;
+        } catch (IOException ex) {
+            plugin.getLogger().warning("Failed to read player data for " + uuid + ": " + ex.getMessage());
+            return new PlayerData(uuid);
+        }
+    }
+
+    private void save(UUID uuid, PlayerData data) {
+        try {
+            Files.writeString(getPath(uuid), gson.toJson(data));
+        } catch (IOException ex) {
+            plugin.getLogger().warning("Failed to save player data for " + uuid + ": " + ex.getMessage());
+        }
+    }
+
+    private Path getPath(UUID uuid) {
+        return dataDirectory.resolve(uuid + ".json");
+    }
+}
+

src/main/resources/config.yml

@@ -0,0 +1,39 @@
+kill-count-cooldown-minutes: 10
+
+gui:
+  title: "&6&lKill Rewards"
+
+sounds:
+  open: BLOCK_CHEST_OPEN
+  progress: ENTITY_EXPERIENCE_ORB_PICKUP
+  unlocked: UI_TOAST_CHALLENGE_COMPLETE
+  claim: ENTITY_PLAYER_LEVELUP
+  denied: BLOCK_NOTE_BLOCK_BASS
+
+quests:
+  hunter_1:
+    required-kills: 5
+    title: "&aHunter I"
+    description:
+      - "&7Kill 5 players in total."
+      - "&7Then claim your first reward."
+    rewards:
+      - "NETHERITE_INGOT:1"
+
+  hunter_2:
+    required-kills: 15
+    title: "&bHunter II"
+    description:
+      - "&7Keep going and reach 15 kills."
+      - "&7More kills, better loot."
+    rewards:
+      - "NETHERITE_SWORD:1"
+
+  hunter_3:
+    required-kills: 30
+    title: "&dHunter III"
+    description:
+      - "&7Reach 30 player kills."
+      - "&7Final reward tier."
+    rewards:
+      - "ENCHANTED_GOLDEN_APPLE:1"

src/main/resources/plugin.yml

@@ -0,0 +1,19 @@
+name: FallSMP-Rewards
+version: '${version}'
+main: de.winniepat.fallSMPRewards.FallSMPRewards
+api-version: '1.21'
+authors: [ WinniePatGG ]
+website: https://winniepat.de
+
+commands:
+  rewards:
+    description: Opens the kill reward quests GUI or reloads config.
+    usage: /rewards [reload]
+
+permissions:
+  fallsmprewards.use:
+    description: Allows opening the rewards GUI.
+    default: true
+  fallsmprewards.reload:
+    description: Allows reloading the rewards config.
+    default: op