Initial commit

.gitignore

@@ -0,0 +1,119 @@
+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+.gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Cache of project
+.gradletasknamecache
+
+**/build/
+
+# Common working directory
+run/
+runs/
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar

build.gradle.kts

@@ -0,0 +1,59 @@
+plugins {
+    kotlin("jvm") version "2.1.20-Beta1"
+    id("com.github.johnrengelman.shadow") version "8.1.1"
+//    id("de.nilsdruyen.gradle-ftp-upload-plugin") version "0.5.0"
+}
+
+group = "com.pobnellion"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+    maven("https://repo.papermc.io/repository/maven-public/") {
+        name = "papermc-repo"
+    }
+    maven("https://oss.sonatype.org/content/groups/public/") {
+        name = "sonatype"
+    }
+    maven("https://repo.dmulloy2.net/repository/public/") {
+        name = "dmulloy2-repo"
+    }
+}
+
+dependencies {
+    compileOnly("io.papermc.paper:paper-api:1.21.3-R0.1-SNAPSHOT")
+    compileOnly("com.comphenix.protocol:ProtocolLib:5.3.0")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+//    implementation("de.nilsdruyen.gradle-ftp-upload-plugin:de.nilsdruyen.gradle-ftp-upload-plugin.gradle.plugin:0.5.0")
+}
+
+val targetJavaVersion = 21
+kotlin {
+    jvmToolchain(targetJavaVersion)
+}
+
+tasks.build {
+    dependsOn("shadowJar")
+}
+
+tasks.processResources {
+    val props = mapOf("version" to version)
+    inputs.properties(props)
+    filteringCharset = "UTF-8"
+    filesMatching("plugin.yml") {
+        expand(props)
+    }
+}
+
+tasks.jar {
+    manifest {
+        attributes["paperweight-mappings-namespace"] = "mojang"
+    }
+}
+
+tasks.shadowJar {
+    manifest {
+        attributes["paperweight-mappings-namespace"] = "mojang"
+    }
+}
+

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

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.kts

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

src/main/kotlin/com/pobnellion/aoe/Aoe.kt

@@ -0,0 +1,23 @@
+package com.pobnellion.aoe
+
+import com.pobnellion.aoe.command.TestCommand
+import com.pobnellion.aoe.ui.PlaceHint
+import com.pobnellion.aoe.ui.PlaceItem
+import org.bukkit.Bukkit
+import org.bukkit.plugin.java.JavaPlugin
+
+class Aoe : JavaPlugin() {
+
+    override fun onEnable() {
+        // Events
+        Bukkit.getPluginManager().registerEvents(PlaceHint(), this)
+        Bukkit.getPluginManager().registerEvents(PlaceItem(), this)
+
+        // Commands
+        this.getCommand("debug")!!.setExecutor(TestCommand())
+    }
+
+    override fun onDisable() {
+        // Plugin shutdown logic
+    }
+}

src/main/kotlin/com/pobnellion/aoe/building/Blacksmith.kt

@@ -0,0 +1,23 @@
+package com.pobnellion.aoe.building
+
+import com.pobnellion.aoe.ui.PlaceHint
+import com.pobnellion.aoe.ui.PlaceHintValidators
+import org.bukkit.Location
+import org.bukkit.Material
+import org.bukkit.entity.Player
+
+class Blacksmith: Building {
+    override fun showPlaceHint(player: Player) {
+        PlaceHint.add(player, 4.0f, 3.0f, 4.0f, ::place, PlaceHintValidators::allReplaceable)
+    }
+
+    fun place(location: Location, sizeX: Float, sizeY: Float, sizeZ: Float) {
+        for (x in 0..<sizeX.toInt())
+            for (y in 0..<sizeY.toInt())
+                for (z in 0..<sizeZ.toInt())
+                    location.world.getBlockAt(
+                        location.blockX + x,
+                        location.blockY + y,
+                        location.blockZ + z ).type = Material.SMOOTH_STONE
+    }
+}

src/main/kotlin/com/pobnellion/aoe/building/Building.kt

@@ -0,0 +1,8 @@
+package com.pobnellion.aoe.building
+
+import org.bukkit.Location
+import org.bukkit.entity.Player
+
+interface Building {
+    fun showPlaceHint(player: Player)
+}

src/main/kotlin/com/pobnellion/aoe/building/House.kt

@@ -0,0 +1,23 @@
+package com.pobnellion.aoe.building
+
+import com.pobnellion.aoe.ui.PlaceHint
+import com.pobnellion.aoe.ui.PlaceHintValidators
+import org.bukkit.Location
+import org.bukkit.Material
+import org.bukkit.entity.Player
+
+class House: Building {
+    override fun showPlaceHint(player: Player) {
+        PlaceHint.add(player, 3.0f, 3.0f, 3.0f, ::place, PlaceHintValidators::allAir)
+    }
+
+    fun place(location: Location, sizeX: Float, sizeY: Float, sizeZ: Float) {
+        for (x in 0..<sizeX.toInt())
+            for (y in 0..<sizeY.toInt())
+                for (z in 0..<sizeZ.toInt())
+                    location.world.getBlockAt(
+                        location.blockX + x,
+                        location.blockY + y,
+                        location.blockZ + z ).type = Material.OAK_LOG
+    }
+}

src/main/kotlin/com/pobnellion/aoe/command/TestCommand.kt

@@ -0,0 +1,20 @@
+package com.pobnellion.aoe.command
+
+import com.pobnellion.aoe.ui.PlaceHint
+import org.bukkit.Material
+import org.bukkit.command.Command
+import org.bukkit.command.CommandExecutor
+import org.bukkit.command.CommandSender
+import org.bukkit.entity.Player
+
+class TestCommand : CommandExecutor {
+    override fun onCommand(sender: CommandSender, command: Command, label: String, args: Array<out String>?): Boolean {
+        if (sender !is Player) {
+            sender.sendMessage("Command can only be executed by players")
+            return true
+        }
+
+        val player: Player = sender
+        return true
+    }
+}

src/main/kotlin/com/pobnellion/aoe/team/Team.kt

@@ -0,0 +1,7 @@
+package com.pobnellion.aoe.team
+
+import com.pobnellion.aoe.building.Building
+
+class Team {
+    public val Buildings: List<Building> = listOf()
+}

src/main/kotlin/com/pobnellion/aoe/ui/PlaceHint.kt

@@ -0,0 +1,302 @@
+package com.pobnellion.aoe.ui;
+
+import com.comphenix.protocol.PacketType
+import com.comphenix.protocol.ProtocolLibrary
+import com.comphenix.protocol.events.PacketContainer
+import com.comphenix.protocol.wrappers.*
+import com.comphenix.protocol.wrappers.WrappedDataWatcher.Registry
+import it.unimi.dsi.fastutil.ints.IntList
+import org.bukkit.Bukkit
+import org.bukkit.Location
+import org.bukkit.Material
+import org.bukkit.entity.EntityType
+import org.bukkit.entity.Player
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.block.Action
+import org.bukkit.event.player.PlayerInteractEvent
+import org.bukkit.event.player.PlayerMoveEvent
+import org.bukkit.potion.PotionEffectType
+import org.joml.Math
+import org.joml.Vector3f
+import java.util.*
+import kotlin.math.floor
+import kotlin.math.min
+
+class PlaceHint : Listener {
+
+    companion object {
+        private const val MAX_TARGET_DISTANCE = 64
+        private val playerHints = HashMap<UUID, HintMarker>();
+
+        fun add(
+            player: Player,
+            sizeX: Float,
+            sizeY: Float,
+            sizeZ: Float,
+            onConfirm: (Location, Float, Float, Float) -> Unit,
+            validate: (Location, Float, Float, Float) -> Boolean,
+            materialValid: Material = Material.LIME_STAINED_GLASS,
+            materialInvalid: Material = Material.RED_STAINED_GLASS,
+        ) {
+            remove(player)
+            createOutlineTeam(player)
+            playerHints[player.uniqueId] = HintMarker(player, sizeX, sizeY, sizeZ, onConfirm, validate, materialValid, materialInvalid)
+            val block = player.getTargetBlockExact(MAX_TARGET_DISTANCE);
+            playerHints[player.uniqueId]!!.moveTo(block?.location)
+        }
+
+        fun remove(player: Player) {
+            if (!playerHints.containsKey(player.uniqueId))
+                return
+
+            playerHints[player.uniqueId]!!.moveTo(null)
+            playerHints.remove(player.uniqueId)
+        }
+
+        fun clear() {
+            playerHints.values.forEach(fun (hint) {hint.moveTo(null)})
+            playerHints.clear()
+        }
+
+        private fun createOutlineTeam(player: Player) {
+            val packet = PacketContainer(PacketType.Play.Server.SCOREBOARD_TEAM)
+            packet.strings.write(0, "placeValid")
+            packet.integers.write(0, 0)
+            packet.optionalTeamParameters.write(0, Optional.of(Utils.teamParams))
+
+            ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet)
+        }
+    }
+
+    @EventHandler
+    fun onPlayerLook(event: PlayerMoveEvent) {
+        if (!playerHints.containsKey(event.player.uniqueId))
+            return
+
+        val block = event.player.getTargetBlockExact(MAX_TARGET_DISTANCE);
+        playerHints[event.player.uniqueId]!!.moveTo(block?.location)
+    }
+
+    @EventHandler
+    fun onLeftClick(event: PlayerInteractEvent) {
+        if (!playerHints.containsKey(event.player.uniqueId) || (event.action != Action.LEFT_CLICK_BLOCK && event.action != Action.LEFT_CLICK_AIR))
+            return
+
+        if (!playerHints[event.player.uniqueId]!!.isValid)
+            return
+
+        val marker = playerHints[event.player.uniqueId]!!
+        marker.onConfirm(marker.currentLocation!!, marker.sizeX, marker.sizeY, marker.sizeZ)
+        remove(event.player)
+    }
+}
+
+private class HintMarker(
+    val player: Player,
+    val sizeX: Float,
+    val sizeY: Float,
+    val sizeZ: Float,
+    val onConfirm: (Location, Float, Float, Float) -> Unit,
+    val validate: (Location, Float, Float, Float) -> Boolean,
+    val materialValid: Material,
+    val materialInvalid: Material,
+) {
+    private val markerUuid = UUID.randomUUID()
+    private val outlineUuid = UUID.randomUUID()
+    private val markerId = (Math.random() * Int.MAX_VALUE).toInt()
+    private val outlineId = markerId + 1
+    var currentLocation: Location? = null
+    var isValid = false
+
+    private fun show(initialLocation: Location) {
+        initialLocation.add(-floor(sizeX / 2.0), 1.0, -floor(sizeZ / 2.0))
+
+        spawnBlockDisplay(markerId, markerUuid, initialLocation, Material.GRAY_STAINED_GLASS, Vector3f(sizeX, 0.2f, sizeZ), 0b01000000)
+//        spawnBlockDisplay(outlineId, outlineUuid, initialLocation, Material.STONE, Vector3f(sizeX, sizeY, sizeZ), 0b00100000)
+
+        val spawnSlimePacket = PacketContainer(PacketType.Play.Server.SPAWN_ENTITY)
+        spawnSlimePacket.integers.write(0, outlineId)
+        spawnSlimePacket.uuiDs.write(0, outlineUuid)
+        spawnSlimePacket.entityTypeModifier.write(0, EntityType.SLIME)
+
+        spawnSlimePacket.doubles
+            .write(0, initialLocation.x)
+            .write(1, initialLocation.y)
+            .write(2, initialLocation.z)
+
+        val dataPacket = PacketContainer(PacketType.Play.Server.ENTITY_METADATA)
+        dataPacket.integers.write(0, outlineId)
+
+        // TODO: 1 - display riding slime for nicer movement
+        // TODO: 2 - slime riding display for nicer movement
+        // TODO: 3 - resource pack for outline with really low opacity
+
+        val watcher = WrappedDataWatcher()
+        watcher.setObject(0, Registry.get(Byte::class.javaObjectType), 0b01100000.toByte())
+//        watcher.setObject(5, Registry.get(Boolean::class.javaObjectType), true)
+        watcher.setObject(16, Registry.get(Int::class.javaObjectType), min(sizeX, min(sizeY, sizeZ)).toInt())
+
+        dataPacket.dataValueCollectionModifier.write(0, watcher.watchableObjects
+            .map { WrappedDataValue(it.watcherObject.index, it.watcherObject.serializer, it.rawValue) })
+
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, spawnSlimePacket)
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, dataPacket)
+
+        val outlineTeamPacket = PacketContainer(PacketType.Play.Server.SCOREBOARD_TEAM)
+        outlineTeamPacket.strings.write(0, "placeValid")
+        outlineTeamPacket.integers.write(0, 3)
+        outlineTeamPacket.getSpecificModifier(Collection::class.java).write(0, listOf(outlineUuid.toString()))
+
+//        val outlineInvisiblePacket = PacketContainer(PacketType.Play.Server.ENTITY_EFFECT)
+//        outlineInvisiblePacket.integers
+//            .write(0, outlineId)
+//            .write(1, 1)
+//            .write(2, -1)
+//
+//        outlineInvisiblePacket.effectTypes.write(0, PotionEffectType.INVISIBILITY)
+//        outlineInvisiblePacket.bytes.write(0, 0b0000.toByte())
+
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, outlineTeamPacket)
+//        ProtocolLibrary.getProtocolManager().sendServerPacket(player, outlineInvisiblePacket)
+
+        isValid = validate(initialLocation, sizeX, sizeY, sizeZ)
+        updateColour()
+
+        currentLocation = initialLocation;
+    }
+
+    private fun hide() {
+        val packet = PacketContainer(PacketType.Play.Server.ENTITY_DESTROY)
+        packet.intLists.write(0, IntList.of(markerId, outlineId))
+
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, packet)
+
+        currentLocation = null
+    }
+
+    fun moveTo(newLocation: Location?) {
+        if (newLocation == null) {
+            if (currentLocation != null)
+                hide()
+            return
+        }
+
+        if (currentLocation == null) {
+            show(newLocation)
+            return
+        }
+
+        newLocation.add(-floor(sizeX / 2.0), 1.0, -floor(sizeZ / 2.0))
+
+        val markerPacket = PacketContainer(PacketType.Play.Server.ENTITY_TELEPORT)
+        markerPacket.integers.write(0, markerId)
+
+        markerPacket.doubles
+            .write(0, newLocation.x)
+            .write(1, newLocation.y)
+            .write(2, newLocation.z)
+
+        markerPacket.booleans.write(0, true)
+
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, markerPacket)
+
+        val outlinePacket = PacketContainer(PacketType.Play.Server.ENTITY_TELEPORT)
+        outlinePacket.integers.write(0, outlineId)
+
+        outlinePacket.doubles
+            .write(0, newLocation.x)
+            .write(1, newLocation.y)
+            .write(2, newLocation.z)
+
+        outlinePacket.booleans.write(0, true)
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, outlinePacket)
+
+        currentLocation = newLocation
+
+        // Update material
+        val valid = validate(newLocation, sizeX, sizeY, sizeZ)
+
+        if (valid != isValid) {
+            isValid = valid
+            updateColour()
+        }
+    }
+
+    // region helper functions
+
+    private fun spawnBlockDisplay(id: Int, uuid: UUID, location: Location, material: Material, scale: Vector3f, options: Byte) {
+        val spawnPacket = PacketContainer(PacketType.Play.Server.SPAWN_ENTITY)
+        spawnPacket.integers.write(0, id)
+        spawnPacket.uuiDs.write(0, uuid)
+        spawnPacket.entityTypeModifier.write(0, EntityType.BLOCK_DISPLAY)
+        spawnPacket.doubles
+            .write(0, location.x)
+            .write(1, location.y)
+            .write(2, location.z)
+
+        val dataPacket = PacketContainer(PacketType.Play.Server.ENTITY_METADATA)
+        dataPacket.integers.write(0, id)
+
+        // woated
+        val blockData = BukkitConverters
+            .getWrappedBlockDataConverter()
+            .getGeneric(WrappedBlockData.createData(material))
+
+        val watcher = WrappedDataWatcher()
+        watcher.setObject(0, Registry.get(Byte::class.javaObjectType), options)
+        watcher.setObject(12, Registry.get(Vector3f::class.javaObjectType), scale)
+        watcher.setObject(23, Registry.getBlockDataSerializer(false), blockData)
+
+        dataPacket.dataValueCollectionModifier.write(0, watcher.watchableObjects
+            .map { WrappedDataValue(it.watcherObject.index, it.watcherObject.serializer, it.rawValue) })
+
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, spawnPacket)
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, dataPacket)
+    }
+
+    private fun updateColour() {
+        // marker
+        val dataPacket = PacketContainer(PacketType.Play.Server.ENTITY_METADATA)
+        dataPacket.integers.write(0,markerId);
+
+        val material = if (isValid) materialValid else materialInvalid
+        val blockData = BukkitConverters
+            .getWrappedBlockDataConverter()
+            .getGeneric(WrappedBlockData.createData(material))
+
+        val metadata = listOf(
+            WrappedDataValue(23, WrappedDataWatcher.Registry.getBlockDataSerializer(false), blockData)
+        )
+
+        dataPacket.dataValueCollectionModifier.write(0, metadata)
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, dataPacket)
+
+        // outline
+        val outlineTeamPacket = PacketContainer(PacketType.Play.Server.SCOREBOARD_TEAM)
+        outlineTeamPacket.strings.write(0, "placeValid")
+        outlineTeamPacket.integers.write(0, 2)
+        val params = WrappedTeamParameters.newBuilder(Utils.teamParams)
+            .color(if (isValid) EnumWrappers.ChatFormatting.GREEN else EnumWrappers.ChatFormatting.RED)
+            .build()
+
+        outlineTeamPacket.optionalTeamParameters.write(0, Optional.of(params))
+        ProtocolLibrary.getProtocolManager().sendServerPacket(player, outlineTeamPacket)
+    }
+
+    // endregion
+}
+
+private class Utils {
+    companion object {
+        val teamParams: WrappedTeamParameters = WrappedTeamParameters.newBuilder()
+            .displayName(WrappedChatComponent.fromText(""))
+            .collisionRule("never")
+            .nametagVisibility("never")
+            .options(0)
+            .color(EnumWrappers.ChatFormatting.RED)
+            .prefix(WrappedChatComponent.fromText(""))
+            .suffix(WrappedChatComponent.fromText(""))
+            .build()
+    }
+}

src/main/kotlin/com/pobnellion/aoe/ui/PlaceHintValidators.kt

@@ -0,0 +1,38 @@
+package com.pobnellion.aoe.ui
+
+import org.bukkit.Location
+
+class PlaceHintValidators {
+    companion object {
+
+        fun alwaysTrue(location: Location, sizeX: Float, sizeY: Float, sizeZ: Float): Boolean {
+            return true
+        }
+
+        fun allAir(location: Location, sizeX: Float, sizeY: Float, sizeZ: Float): Boolean {
+            for (x in 0..<sizeX.toInt())
+                for (y in 0..<sizeY.toInt())
+                    for (z in 0..<sizeZ.toInt())
+                        if (!location.world.getBlockAt(
+                            location.blockX + x,
+                            location.blockY + y,
+                            location.blockZ + z ).isEmpty)
+                            return false
+
+            return true
+        }
+
+        fun allReplaceable(location: Location, sizeX: Float, sizeY: Float, sizeZ: Float): Boolean {
+            for (x in 0..<sizeX.toInt())
+                for (y in 0..<sizeY.toInt())
+                    for (z in 0..<sizeZ.toInt())
+                        if (!location.world.getBlockAt(
+                                location.blockX + x,
+                                location.blockY + y,
+                                location.blockZ + z ).isReplaceable)
+                            return false
+
+            return true
+        }
+    }
+}

src/main/kotlin/com/pobnellion/aoe/ui/PlaceItem.kt

@@ -0,0 +1,67 @@
+package com.pobnellion.aoe.ui
+
+import com.pobnellion.aoe.building.Blacksmith
+import com.pobnellion.aoe.building.House
+import net.kyori.adventure.text.Component
+import org.bukkit.Bukkit
+import org.bukkit.Material
+import org.bukkit.entity.Player
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.block.Action
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.event.inventory.InventoryCloseEvent
+import org.bukkit.event.inventory.InventoryDragEvent
+import org.bukkit.event.player.PlayerInteractEvent
+import org.bukkit.inventory.ItemStack
+
+
+class PlaceItem : Listener {
+    private val buildingInventory = Bukkit.createInventory(null, 9, Component.text("Buildings"))
+
+    init {
+        buildingInventory.addItem(createGuiItem(Material.OAK_LOG, "House", "Just a house bro"))
+        buildingInventory.addItem(createGuiItem(Material.ANVIL, "Blacksmith", "smith ."))
+    }
+
+    @EventHandler
+    fun onRightClickItem(event: PlayerInteractEvent) {
+        if (event.material != Material.BRICKS || (event.action != Action.RIGHT_CLICK_AIR && event.action != Action.RIGHT_CLICK_BLOCK))
+            return
+
+        event.isCancelled = true
+        event.player.openInventory(buildingInventory)
+    }
+
+    @EventHandler
+    fun onInventoryClick(event: InventoryClickEvent) {
+        if (event.inventory != buildingInventory)
+            return
+
+        event.isCancelled = true
+        var validClick = true
+
+        when (event.currentItem?.type) {
+            Material.OAK_LOG -> House().showPlaceHint(event.whoClicked as Player)
+            Material.ANVIL -> Blacksmith().showPlaceHint(event.whoClicked as Player)
+            else -> validClick = false
+        }
+
+        if (validClick)
+            event.whoClicked.closeInventory(InventoryCloseEvent.Reason.PLUGIN)
+    }
+
+    @EventHandler
+    fun onInventoryClick(event: InventoryDragEvent) {
+        if (event.inventory == buildingInventory)
+            event.isCancelled = true
+    }
+
+    private fun createGuiItem(material: Material, name: String, lore: String): ItemStack {
+        val item = ItemStack(material, 1)
+        item.itemMeta.displayName(Component.text(name))
+        item.itemMeta.lore(mutableListOf(Component.text(lore)))
+        return item
+    }
+
+}

src/main/resources/plugin.yml

@@ -0,0 +1,10 @@
+name: aoe
+version: '1.0-SNAPSHOT'
+main: com.pobnellion.aoe.Aoe
+api-version: '1.21'
+depend:
+  - ProtocolLib
+commands:
+  debug:
+    description: Debug command
+    usage: /debug