initial

.gitattributes

@@ -0,0 +1,11 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
+# Binary files should be left untouched
+*.jar           binary

.gitignore

@@ -0,0 +1,21 @@
+# MacOS DS_Store files
+.DS_Store
+
+# Gradle cache folder
+.gradle
+
+# Gradle build folder
+build
+
+# IntelliJ
+out/
+.idea
+*.iml
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# Common working directory
+run

build.gradle.kts

@@ -0,0 +1,34 @@
+plugins {
+    id("java-library")
+    id("xyz.jpenilla.run-paper") version "3.0.2"
+}
+
+repositories {
+    mavenCentral()
+    maven("https://repo.papermc.io/repository/maven-public/")
+}
+
+dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.21.11-R0.1-SNAPSHOT")
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(21)
+}
+
+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")
+        jvmArgs("-Xms2G", "-Xmx2G")
+    }
+
+    processResources {
+        val props = mapOf("version" to version, "description" to project.description)
+        filesMatching("plugin.yml") {
+            expand(props)
+        }
+    }
+}

gitignroe

@@ -0,0 +1,16 @@
+bin/
+libs/
+.idea/
+.gradle/
+build/
+out/
+
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+
+run/
+
+*.log

gradle.properties

@@ -0,0 +1,6 @@
+group=org.adrianvictor
+version=1.0-SNAPSHOT
+description=Take your players to the dreamland when sleeping!
+org.gradle.configuration-cache=true
+org.gradle.parallel=true
+org.gradle.caching=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   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/b631911858264c0b6e4d6603d677ff5218766cee/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 -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || 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 "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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 "$APP_HOME" )
+
+    JAVACMD=$( 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, 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=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$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 +1,93 @@
+@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
+@rem SPDX-License-Identifier: Apache-2.0
+@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
+
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+: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.kts

@@ -0,0 +1 @@
+rootProject.name = "SweetDreams"

src/main/java/org/adrianvictor/sweetdreams/Configuration.java

@@ -0,0 +1,46 @@
+package org.adrianvictor.sweetdreams;
+
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+import java.io.File;
+import java.io.IOException;
+
+public class Configuration {
+    private final YamlConfiguration playerStorage = new YamlConfiguration();
+    private final File playerStorageFile;
+    private final YamlConfiguration pluginConfig = new YamlConfiguration();
+    private final File pluginConfigFile = new File("");
+    private final SweetDreams plugin;
+
+    public Configuration() {
+        plugin = SweetDreams.getPlugin();
+        playerStorageFile = new File(plugin.getDataFolder(), "playerstorage.yml");
+
+        if (playerStorageFile.exists()) {
+            try {
+                playerStorage.load(playerStorageFile);
+            } catch (IOException | InvalidConfigurationException e) {
+                plugin.getLogger().severe("Error loading player storage: " + e.getMessage());
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public void savePlayerStorage() {
+        try {
+            playerStorage.save(playerStorageFile);
+        } catch (IOException e) {
+            plugin.getLogger().severe("Could not save to player storage: " + e.getMessage());
+            throw new RuntimeException(e);
+        }
+    }
+
+    public YamlConfiguration getPlayerStorage() {
+        return playerStorage;
+    }
+
+    public YamlConfiguration getPluginConfig() {
+        return pluginConfig;
+    }
+}

src/main/java/org/adrianvictor/sweetdreams/EventListener.java

@@ -0,0 +1,122 @@
+package org.adrianvictor.sweetdreams;
+
+import com.destroystokyo.paper.event.player.PlayerSetSpawnEvent;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Sound;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityPortalEnterEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
+import org.bukkit.event.player.PlayerBedEnterEvent;
+import org.bukkit.util.Vector;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+
+public class EventListener implements Listener {
+    private final PlayerStorage storage;
+    private final Set<UUID> teleporting = new HashSet<>();
+
+    public EventListener() {
+        this.storage = SweetDreams.getPlugin().getStorage();
+    }
+
+    @EventHandler
+    public void onPlayerBedEnterEvent(PlayerBedEnterEvent event) {
+        if (event.getPlayer().getWorld() == SweetDreams.getPlugin().getWorld()) {
+            storage.savePlayerSpawnPoint(event.getPlayer());
+            event.getPlayer().sendMessage("Respawn point set.");
+            event.setCancelled(true);
+            return;
+        }
+
+        Long time = event.getPlayer().getWorld().getTime();
+
+        if (!(time >= 13000 && time <= 23000)) {
+            event.setCancelled(true);
+            return;
+        }
+
+        teleport(event.getPlayer());
+
+        event.setCancelled(true);
+    }
+
+    @EventHandler
+    public void onPlayerSetSpawn(PlayerSetSpawnEvent event) {
+        if (event.getPlayer().getWorld() != SweetDreams.getPlugin().getWorld())
+            return;
+
+        // TODO save player spawn point on dreamlands
+
+        event.setCancelled(true);
+    }
+
+    @EventHandler
+    public void onPortalEnter(EntityPortalEnterEvent event) {
+        if (event.getEntity().getWorld() == SweetDreams.getPlugin().getWorld())
+            event.setCancelled(true);
+    }
+
+    @EventHandler
+    public void onEntityDamage(EntityDamageEvent event) {
+        if (event.getEntity().getWorld() != SweetDreams.getPlugin().getWorld()) return;
+        if (event.getEntity() instanceof Player player) {
+            if (event.getCause() == EntityDamageEvent.DamageCause.VOID) {
+                teleport(player);
+
+                player.setVelocity(new Vector(0, 0, 0));
+                player.setFallDistance(0);
+            }
+        }
+    }
+
+    @EventHandler
+    public void onPlayerDeath(PlayerDeathEvent event) {
+        if (event.getEntity().getWorld() != SweetDreams.getPlugin().getWorld()) return;
+        Player player = event.getPlayer();
+
+        teleport(player);
+        event.setCancelled(true);
+    }
+
+    private void teleport(Player player) {
+        UUID uuid = player.getUniqueId();
+        if (!teleporting.add(uuid)) return;
+
+        Bukkit.getScheduler().runTask(SweetDreams.getPlugin(), () -> {
+            try {
+                World playerWorld = player.getWorld();
+
+                if (playerWorld == SweetDreams.getPlugin().getWorld()) {
+                    storage.savePlayer(player, PlayerStorage.StorageWorldType.SKYLANDS);
+
+                    player.teleport(Objects.requireNonNullElse(
+                            player.getRespawnLocation(),
+                            Bukkit.getWorld("world").getSpawnLocation()
+                    ));
+                    player.getInventory().clear();
+
+                    storage.loadPlayer(player, PlayerStorage.StorageWorldType.OVERWORLD);
+
+                    player.sendMessage("You woke up from a bad dream...");
+                    player.playSound(player.getLocation(), Sound.ENTITY_ENDER_DRAGON_DEATH, 1.0f, 1.0f);
+                } else {
+                    World world = SweetDreams.getPlugin().getWorld();
+
+                    storage.savePlayer(player, PlayerStorage.StorageWorldType.OVERWORLD);
+                    player.getInventory().clear();
+                    player.teleport(storage.loadPlayer(player, PlayerStorage.StorageWorldType.SKYLANDS));
+                }
+            } finally {
+                teleporting.remove(uuid);
+            }
+        });
+    }
+}

src/main/java/org/adrianvictor/sweetdreams/PlayerStorage.java

@@ -0,0 +1,140 @@
+package org.adrianvictor.sweetdreams;
+
+import org.bukkit.Location;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.UUID;
+
+public class PlayerStorage {
+    private final Configuration config;
+    private final YamlConfiguration storage;
+//    Map<UUID, ItemStack[]> inventories = new HashMap<>();
+
+    public enum StorageWorldType {
+        OVERWORLD("overworld"),
+        SKYLANDS("skylands");
+
+        private final String key;
+
+        StorageWorldType(String key) {
+            this.key = key;
+        }
+
+        public String getKey() {
+            return key;
+        }
+    }
+
+    public PlayerStorage(Configuration config) {
+        this.config = config;
+        this.storage = config.getPlayerStorage();
+    }
+
+    public void savePlayer(Player player, StorageWorldType type) {
+        UUID uuid = player.getUniqueId();
+        String base = "players." + uuid + "." + type.getKey();
+
+        ItemStack[] inv = player.getInventory().getContents();
+        storage.set(base + ".inventory", null);
+        for (int i = 0; i < inv.length; i++) {
+            storage.set(base + ".inventory." + i, inv[i]);
+        }
+
+        ItemStack[] armor = player.getInventory().getArmorContents();
+        storage.set(base + ".armor", null);
+        for (int i = 0; i < armor.length; i++) {
+            storage.set(base + ".armor." + i, armor[i]);
+        }
+
+        storage.set(base + ".offhand", player.getInventory().getItemInOffHand());
+
+        ItemStack[] ender = player.getEnderChest().getContents();
+        storage.set(base + ".enderchest", null);
+        for (int i = 0; i < ender.length; i++) {
+            storage.set(base + ".enderchest." + i, ender[i]);
+        }
+
+        storage.set(base + ".xp.level", player.getLevel());
+        storage.set(base + ".xp.exp", player.getExp());
+        storage.set(base + ".xp.total", player.getTotalExperience());
+
+        storage.set(base + ".stats.health", player.getHealth());
+        storage.set(base + ".stats.food", player.getFoodLevel());
+        storage.set(base + ".stats.saturation", player.getSaturation());
+
+        config.savePlayerStorage();
+    }
+
+    public Location loadPlayer(Player player, StorageWorldType type) {
+        UUID uuid = player.getUniqueId();
+        String base = "players." + uuid + "." + type.getKey();
+
+        ItemStack[] inv = new ItemStack[36];
+        var invSec = storage.getConfigurationSection(base + ".inventory");
+        if (invSec != null) {
+            for (String key : invSec.getKeys(false)) {
+                try {
+                    int slot = Integer.parseInt(key);
+                    if (slot >= 0 && slot < inv.length) {
+                        inv[slot] = storage.getItemStack(base + ".inventory." + key);
+                    }
+                } catch (Exception ignored) {}
+            }
+        }
+        player.getInventory().setContents(inv);
+
+        ItemStack[] armor = new ItemStack[4];
+        var armorSec = storage.getConfigurationSection(base + ".armor");
+        if (armorSec != null) {
+            for (String key : armorSec.getKeys(false)) {
+                try {
+                    int slot = Integer.parseInt(key);
+                    if (slot >= 0 && slot < armor.length) {
+                        armor[slot] = storage.getItemStack(base + ".armor." + key);
+                    }
+                } catch (Exception ignored) {}
+            }
+        }
+        player.getInventory().setArmorContents(armor);
+
+        ItemStack offhand = storage.getItemStack(base + ".offhand");
+        player.getInventory().setItemInOffHand(offhand);
+
+        ItemStack[] ender = new ItemStack[27];
+        var enderSec = storage.getConfigurationSection(base + ".enderchest");
+        if (enderSec != null) {
+            for (String key : enderSec.getKeys(false)) {
+                try {
+                    int slot = Integer.parseInt(key);
+                    if (slot >= 0 && slot < ender.length) {
+                        ender[slot] = storage.getItemStack(base + ".enderchest." + key);
+                    }
+                } catch (Exception ignored) {}
+            }
+        }
+        player.getEnderChest().setContents(ender);
+
+        player.setTotalExperience(storage.getInt(base + ".xp.total", 0));
+        player.setLevel(storage.getInt(base + ".xp.level", 0));
+        player.setExp((float) storage.getDouble(base + ".xp.exp", 0.0));
+
+        player.setHealth(Math.min(storage.getDouble(base + ".stats.health", 20.0), player.getMaxHealth()));
+        player.setFoodLevel(storage.getInt(base + ".stats.food", 20));
+        player.setSaturation((float) storage.getDouble(base + ".stats.saturation", 5.0));
+
+        Object rawSpawn = storage.get(base + ".spawn");
+        if (rawSpawn instanceof Location spawn) {
+            return spawn;
+        } else {
+            return SweetDreams.getPlugin().getWorld().getSpawnLocation();
+        }
+    }
+
+    public void savePlayerSpawnPoint(Player player) {
+        UUID uuid = player.getUniqueId();
+        String base = "players." + uuid + ".skylands";
+        storage.set(base + ".spawn", player.getLocation());
+    }
+}

src/main/java/org/adrianvictor/sweetdreams/SkyIslandsGenerator.java

@@ -0,0 +1,398 @@
+package org.adrianvictor.sweetdreams;
+
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.generator.BlockPopulator;
+import org.bukkit.generator.ChunkGenerator;
+import org.bukkit.generator.WorldInfo;
+import org.jspecify.annotations.NonNull;
+
+import java.util.*;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class SkyIslandsGenerator extends ChunkGenerator {
+
+    private enum IslandType {
+        ROUND,
+        LONG,
+        ARCHIPELAGO,
+        SPIKY
+    }
+
+    private static final IslandType[] TYPES = IslandType.values();
+
+    private record Blob(double x, double y, double z, double rx, double ry, double rz) {}
+
+    private static final int CELL_SIZE = 30;
+
+    private static final int MIN_RADIUS = 6;
+    private static final int MAX_RADIUS = 16;
+
+    private static final int MIN_Y = 80;
+    private static final int MAX_Y = 180;
+
+    private record LeafOffset(int dx, int dy, int dz) {}
+
+    private static final LeafOffset[] LEAF_OFFSETS;
+
+    static {
+        java.util.List<LeafOffset> offsets = new java.util.ArrayList<>();
+
+        for (int dx = -2; dx <= 2; dx++) {
+            for (int dz = -2; dz <= 2; dz++) {
+                for (int dy = -2; dy <= 0; dy++) {
+
+                    if (Math.abs(dx) + Math.abs(dz) <= 3) {
+                        offsets.add(new LeafOffset(dx, dy, dz));
+                    }
+                }
+            }
+        }
+
+        LEAF_OFFSETS = offsets.toArray(LeafOffset[]::new);
+    }
+
+    @Override
+    public @NonNull List<BlockPopulator> getDefaultPopulators(@NonNull World world) {
+        return Collections.singletonList(new SkylandsBlockPopulator());
+    }
+
+    @Override
+    public void generateSurface(WorldInfo worldInfo, @NonNull Random random, int chunkX, int chunkZ, @NonNull ChunkData chunkData) {
+
+        long seed = worldInfo.getSeed();
+
+        int chunkWorldX = chunkX * 16;
+        int chunkWorldZ = chunkZ * 16;
+
+        int cellX = Math.floorDiv(chunkWorldX, CELL_SIZE);
+        int cellZ = Math.floorDiv(chunkWorldZ, CELL_SIZE);
+
+        short[][] highestY = new short[16][16];
+
+        AtomicBoolean hasTerrain = new AtomicBoolean(false);
+
+        for (int x = 0; x < 16; x++) {
+            Arrays.fill(highestY[x], Short.MIN_VALUE);
+        }
+
+        for (int gx = cellX - 2; gx <= cellX + 2; gx++) {
+            for (int gz = cellZ - 2; gz <= cellZ + 2; gz++) {
+
+                SplittableRandom r = new SplittableRandom(hash(seed, gx, gz));
+                if (r.nextDouble() > 0.8) {
+                    continue;
+                }
+
+                generateIslandGeometry(
+                        gx,
+                        gz,
+                        r,
+                        blob -> hasTerrain.set(hasTerrain.get() | carveBlob(
+                                chunkData,
+                                chunkX,
+                                chunkZ,
+                                blob,
+                                highestY
+                        ))
+                );
+
+            }
+        }
+
+        if (!hasTerrain.get()) {
+            return;
+        }
+
+        decorateTerrain(chunkData, random, highestY);
+    }
+
+    private boolean carveBlob(ChunkData chunkData, int chunkX, int chunkZ, Blob blob, short[][] highestY) {
+        boolean touched = false;
+
+        int minHeight = chunkData.getMinHeight();
+        int maxHeight = chunkData.getMaxHeight() - 1;
+
+        double invRx = 1.0 / blob.rx();
+        double invRy = 1.0 / blob.ry();
+        double invRz = 1.0 / blob.rz();
+
+        int baseX = chunkX * 16;
+        int baseZ = chunkZ * 16;
+
+        int blobMinX = (int)Math.floor(blob.x() - blob.rx());
+        int blobMaxX = (int)Math.ceil(blob.x() + blob.rx());
+
+        int blobMinZ = (int)Math.floor(blob.z() - blob.rz());
+        int blobMaxZ = (int)Math.ceil(blob.z() + blob.rz());
+
+        int minLocalX = Math.max(0, blobMinX - baseX);
+        int maxLocalX = Math.min(15, blobMaxX - baseX);
+
+        int minLocalZ = Math.max(0, blobMinZ - baseZ);
+        int maxLocalZ = Math.min(15, blobMaxZ - baseZ);
+
+        for (int localX = minLocalX; localX <= maxLocalX; localX++) {
+            for (int localZ = minLocalZ; localZ <= maxLocalZ; localZ++) {
+
+                int worldX = baseX + localX;
+                int worldZ = baseZ + localZ;
+
+//                int minY = Math.max(chunkData.getMinHeight(), (int)Math.floor(blob.y() - blob.ry()));
+//                int maxY = Math.min(chunkData.getMaxHeight() -1, (int)Math.ceil(blob.y() + blob.ry()));
+
+                double nx = (worldX - blob.x()) * invRx;
+                double nz = (worldZ - blob.z()) * invRz;
+
+                double horizontal = nx * nx + nz * nz;
+
+                if (horizontal > 1.0)
+                    continue;
+
+                double remaining = 1.0 - horizontal;
+
+                if (remaining <= 0)
+                    continue;
+
+                double yRadius = Math.sqrt(remaining) * blob.ry();
+
+                int startY = Math.max(
+                        minHeight,
+                        (int)Math.ceil(blob.y() - yRadius)
+                );
+
+                int endY = Math.min(
+                        maxHeight,
+                        (int)Math.floor(blob.y() + yRadius)
+                );
+
+                for (int y = startY; y <= endY; y++) {
+                    chunkData.setBlock(localX, y, localZ, Material.STONE);
+                    touched = true;
+                }
+
+                highestY[localX][localZ] = (short) Math.max(highestY[localX][localZ], endY);
+            }
+        }
+
+        return touched;
+    }
+
+    private void decorateTerrain(ChunkData chunkData, Random random, short[][] highestY) {
+        generateSurfaceLayers(chunkData, highestY);
+        generateOres(chunkData, random);
+        generateTrees(chunkData, random, highestY);
+    }
+
+    private void generateSurfaceLayers(ChunkData chunkData, short[][] highestY) {
+        int minHeight = chunkData.getMinHeight();
+        int maxHeight = chunkData.getMaxHeight() - 1;
+
+        for (int x = 0; x < 16; x++) {
+            for (int z = 0; z < 16; z++) {
+
+                int highest = highestY[x][z];
+
+                if (highest == Short.MIN_VALUE)
+                    continue;
+
+                chunkData.setBlock(x, highest, z, Material.GRASS_BLOCK);
+
+                for (int y = highest - 1; y >= highest - 3; y--) {
+                    if (y >= minHeight) {
+                        chunkData.setBlock(x, y, z, Material.DIRT);
+                    }
+                }
+            }
+        }
+    }
+
+    private void generateOres(ChunkData chunkData, Random random) {
+        generateOreVeins(chunkData, random, Material.COAL_ORE, 25, 10);
+        generateOreVeins(chunkData, random, Material.IRON_ORE, 15, 8);
+        generateOreVeins(chunkData, random, Material.GOLD_ORE, 6, 6);
+        generateOreVeins(chunkData, random, Material.DIAMOND_ORE, 2, 4);
+    }
+
+    private void generateOreVeins(ChunkData chunkData, Random random, Material ore, int veins, int size) {
+
+        for (int i = 0; i < veins; i++) {
+
+            int startX = random.nextInt(16);
+            int startY = chunkData.getMinHeight() + random.nextInt(chunkData.getMaxHeight() - chunkData.getMinHeight());
+
+            int startZ = random.nextInt(16);
+
+            for (int j = 0; j < size; j++) {
+
+                int x = startX + random.nextInt(5) - 2;
+                int y = startY + random.nextInt(5) - 2;
+                int z = startZ + random.nextInt(5) - 2;
+
+                if (x < 0 || x >= 16) continue;
+                if (z < 0 || z >= 16) continue;
+                if (y < chunkData.getMinHeight()) continue;
+                if (y >= chunkData.getMaxHeight()) continue;
+
+                if (chunkData.getType(x, y, z) == Material.STONE) {
+                    chunkData.setBlock(x, y, z, ore);
+                }
+            }
+        }
+    }
+
+    private void generateTrees(ChunkData chunkData, Random random, short[][] highestY) {
+        for (int x = 2; x < 14; x++) {
+            for (int z = 2; z < 14; z++) {
+
+                if (random.nextInt(500) != 0) {
+                    continue;
+                }
+
+                int y = highestY[x][z];
+
+                if (y == Short.MIN_VALUE) {
+                    continue;
+                }
+
+                if (chunkData.getType(x, y, z) != Material.GRASS_BLOCK) {
+                    continue;
+                }
+
+                placeTree(chunkData, x, y + 1, z, random);
+            }
+        }
+    }
+
+    private void placeTree(ChunkData chunkData, int x, int y, int z, Random random) {
+        int height = 4 + random.nextInt(3);
+
+        for (int dy = 0; dy < height; dy++) {
+            chunkData.setBlock(x, y + dy, z, Material.OAK_LOG);
+        }
+
+        int top = y + height;
+
+        for (LeafOffset o : LEAF_OFFSETS) {
+            chunkData.setBlock(
+                    x + o.dx(),
+                    top + o.dy(),
+                    z + o.dz(),
+                    Material.OAK_LEAVES
+            );
+        }
+
+        chunkData.setBlock(x, top + 1, z, Material.OAK_LEAVES);
+    }
+
+    private void generateIslandGeometry(
+            int cellX,
+            int cellZ,
+            SplittableRandom random,
+            java.util.function.Consumer<Blob> consumer
+    ) {
+
+        int centerX = cellX * CELL_SIZE + random.nextInt(CELL_SIZE);
+        int centerZ = cellZ * CELL_SIZE + random.nextInt(CELL_SIZE);
+        int centerY = MIN_Y + random.nextInt(MAX_Y - MIN_Y);
+
+        IslandType type =
+                TYPES[random.nextInt(TYPES.length)];
+
+        switch (type) {
+
+            case ROUND -> {
+
+                consumer.accept(
+                        new Blob(
+                                centerX,
+                                centerY,
+                                centerZ,
+                                12 + random.nextInt(10),
+                                6 + random.nextInt(5),
+                                12 + random.nextInt(10)
+                        )
+                );
+            }
+
+            case LONG -> {
+
+                double angle = random.nextDouble() * Math.PI * 2;
+
+                int segments = 3 + random.nextInt(5);
+
+                for (int i = 0; i < segments; i++) {
+
+                    consumer.accept(
+                            new Blob(
+                                    centerX + Math.cos(angle) * i * 10,
+                                    centerY + random.nextInt(5) - 2,
+                                    centerZ + Math.sin(angle) * i * 10,
+                                    8 + random.nextInt(4),
+                                    5 + random.nextInt(2),
+                                    8 + random.nextInt(4)
+                            )
+                    );
+                }
+            }
+
+            case ARCHIPELAGO -> {
+
+                int count = 3 + random.nextInt(5);
+
+                for (int i = 0; i < count; i++) {
+
+                    consumer.accept(
+                            new Blob(
+                                    centerX + random.nextInt(60) - 30,
+                                    centerY,
+                                    centerZ + random.nextInt(60) - 30,
+                                    7 + random.nextInt(5),
+                                    4 + random.nextInt(3),
+                                    7 + random.nextInt(5)
+                            )
+                    );
+                }
+            }
+
+            case SPIKY -> {
+
+                consumer.accept(
+                        new Blob(centerX, centerY, centerZ, 16, 8, 16)
+                );
+
+                for (int i = 0; i < 6; i++) {
+
+                    consumer.accept(
+                            new Blob(
+                                    centerX + random.nextInt(20) - 10,
+                                    centerY - random.nextInt(12),
+                                    centerZ + random.nextInt(20) - 10,
+                                    2,
+                                    10 + random.nextInt(8),
+                                    2
+                            )
+                    );
+                }
+            }
+        }
+    }
+
+    private static long hash(long seed, int x, int z) {
+        long h = seed;
+
+        h ^= (long) x * 0x9E3779B97F4A7C15L;
+        h ^= (long) z * 0xC2B2AE3D27D4EB4FL;
+
+        h ^= h >>> 30;
+        h *= 0xBF58476D1CE4E5B9L;
+
+        h ^= h >>> 27;
+        h *= 0x94D049BB133111EBL;
+
+        h ^= h >>> 31;
+
+        return h;
+    }
+
+}

src/main/java/org/adrianvictor/sweetdreams/SkylandsBlockPopulator.java

@@ -0,0 +1,22 @@
+package org.adrianvictor.sweetdreams;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.generator.BlockPopulator;
+import org.bukkit.generator.LimitedRegion;
+import org.bukkit.generator.WorldInfo;
+import org.jspecify.annotations.NonNull;
+
+import java.util.Random;
+
+public class SkylandsBlockPopulator extends BlockPopulator {
+    @Override
+    public void populate(
+            @NonNull WorldInfo worldInfo,
+            @NonNull Random random,
+            int chunkX,
+            int chunkZ,
+            @NonNull LimitedRegion region
+    ) {
+    }
+}

src/main/java/org/adrianvictor/sweetdreams/SweetDreams.java

@@ -0,0 +1,86 @@
+package org.adrianvictor.sweetdreams;
+
+import org.bukkit.Bukkit;
+import org.bukkit.World;
+import org.bukkit.WorldCreator;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.io.File;
+
+public final class SweetDreams extends JavaPlugin {
+    private World world;
+    private static SweetDreams plugin;
+    private Configuration configuration;
+    private PlayerStorage storage;
+
+    @Override
+    public void onEnable() {
+        plugin = this;
+        configuration = new Configuration();
+        storage = new PlayerStorage(configuration);
+
+        boolean generated = false;
+
+        for (World world: getServer().getWorlds()) {
+            if (world.getName().equals("world_sweetdreams")) {
+                Bukkit.unloadWorld(world, true);
+                File worldFolder = new File(Bukkit.getWorldContainer(), "world_sweetdreams");
+                if (worldFolder.exists()) {
+                    deleteFolder(worldFolder);
+                }
+//                this.world = world;
+//                generated = true;
+            }
+        }
+
+        if (!generated) {
+            world = createSkylandsWorld("world_sweetdreams");
+        }
+
+        getServer().getPluginManager().registerEvents(new EventListener(), this);
+    }
+
+    private void deleteFolder(File folder) {
+        if (folder.isDirectory()) {
+            File[] files = folder.listFiles();
+            if (files != null) {
+                for (File file : files) {
+                    deleteFolder(file);
+                }
+            }
+        }
+        folder.delete();
+    }
+
+    @Override
+    public void onDisable() {
+        // Plugin shutdown logic
+    }
+
+    public World getWorld() {
+        return world;
+    }
+
+    public static SweetDreams getPlugin() {
+        return plugin;
+    }
+
+    public World createSkylandsWorld(String worldName) {
+        WorldCreator creator = new WorldCreator(worldName);
+        creator.generator(new SkyIslandsGenerator());
+        creator.environment(World.Environment.NORMAL);
+
+        World world = creator.createWorld();
+        world.setSpawnFlags(true, true);
+
+        return world;
+    }
+
+    public Configuration getConfiguration() {
+        return configuration;
+    }
+
+    public PlayerStorage getStorage() {
+        return storage;
+    }
+}

src/main/resources/plugin.yml

@@ -0,0 +1,11 @@
+name: SweetDreams
+description: $description
+prefix: SweetDreams
+version: '${version}'
+
+main: org.adrianvictor.sweetdreams.SweetDreams
+api-version: '1.21.11'
+load: POSTWORLD
+
+authors: [ tenkuma ]
+website: https://adrianvic.github.io