Some work

src/main/java/eu/m724/musicPlugin/MusicCommands.java

@@ -1,6 +1,7 @@
 package eu.m724.musicPlugin;
 
 import eu.m724.musicPlugin.file.AudioFileStorage;
+import eu.m724.musicPlugin.item.PortableMediaPlayer;
 import eu.m724.musicPlugin.player.MusicPlayer;
 import eu.m724.musicPlugin.file.AudioFile;
 import eu.m724.musicPlugin.player.StaticMusicPlayer;
@@ -101,6 +102,17 @@ public class MusicCommands implements CommandExecutor {
         } else if (command.getName().equals("resume")) {
             player.unpause();
             sender.sendMessage("unapuised");
+        } else if (command.getName().equals("pmp")) {
+            var p = (Player) sender;
+            var pmp = PortableMediaPlayer.fromItemStack(p.getItemInHand()).join();
+            if (pmp != null) {
+                sender.sendMessage(String.valueOf(pmp.id));
+                sender.sendMessage(String.valueOf(pmp.premium));
+                sender.sendMessage(pmp.engraving);
+            } else {
+                pmp = PortableMediaPlayer.create(args[0].equals("yes"), args[1]);
+                p.getInventory().addItem(pmp.getItemStack());
+            }
         }
 
         return true;

src/main/java/eu/m724/musicPlugin/MusicPlugin.java

@@ -4,6 +4,8 @@ import de.maxhenkel.voicechat.api.BukkitVoicechatService;
 import de.maxhenkel.voicechat.api.VoicechatConnection;
 import de.maxhenkel.voicechat.api.VoicechatServerApi;
 import eu.m724.musicPlugin.file.AudioFileStorage;
+import eu.m724.musicPlugin.item.ItemStorage;
+import org.bukkit.entity.Item;
 import org.bukkit.plugin.java.JavaPlugin;
 
 public final class MusicPlugin extends JavaPlugin {
@@ -28,6 +30,9 @@ public final class MusicPlugin extends JavaPlugin {
         getCommand("stop").setExecutor(mcmd);
         getCommand("pause").setExecutor(mcmd);
         getCommand("resume").setExecutor(mcmd);
+        getCommand("pmp").setExecutor(mcmd);
+
+        ItemStorage.init(this);
 
     }
 
@@ -35,7 +40,7 @@ public final class MusicPlugin extends JavaPlugin {
         getLogger().info("registerating...");
 
         var category = api.volumeCategoryBuilder()
-                .setId("music724")
+                .setId("musicc")
                 .setName("Music players")
                 .build();
 

src/main/java/eu/m724/musicPlugin/item/ItemEvents.java

@@ -0,0 +1,6 @@
+package eu.m724.musicPlugin.item;
+
+import org.bukkit.event.Listener;
+
+public class ItemEvents implements Listener {
+}

src/main/java/eu/m724/musicPlugin/item/ItemStorage.java

@@ -0,0 +1,70 @@
+package eu.m724.musicPlugin.item;
+
+import eu.m724.musicPlugin.MusicPlugin;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.persistence.PersistentDataType;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.util.HashMap;
+import java.util.HexFormat;
+import java.util.Map;
+
+public class ItemStorage {
+    private static ItemStorage INSTANCE;
+
+    private File directory;
+    private Map<Integer, PortableMediaPlayer> cache = new HashMap<>(); // TODO clean cache
+
+    public static void init(MusicPlugin plugin) {
+        INSTANCE = new ItemStorage();
+        INSTANCE.directory = new File(plugin.getDataFolder(), "storage");
+    }
+
+    static ItemStorage getInstance() {
+        return INSTANCE;
+    }
+
+    public PortableMediaPlayer getPortableMediaPlayer(int id) throws IOException {
+        var file = new File(directory, HexFormat.of().toHexDigits(id));
+
+        if (!file.exists()) return null;
+
+        ByteBuffer buffer = ByteBuffer.wrap(Files.readAllBytes(file.toPath()));
+
+        if (buffer.get() != 0) { // TODO version mismatch
+
+        }
+
+        var premium = buffer.get() == 1;
+
+        var eb = new byte[Byte.toUnsignedInt(buffer.get())];
+        buffer.get(eb);
+        var engraving = new String(eb, StandardCharsets.UTF_8);
+
+        return new PortableMediaPlayer(id, premium, engraving);
+    }
+
+    public void savePortableMediaPlayer(PortableMediaPlayer player) throws IOException {
+        var file = new File(directory, HexFormat.of().toHexDigits(player.id));
+
+        Files.write(file.toPath(), getData(player));
+    }
+
+
+    public byte[] getData(PortableMediaPlayer player) {
+        var buffer = ByteBuffer.allocate(8 + player.engraving.length());
+        buffer.put((byte) 0); // version
+        buffer.put((byte) (player.premium ? 1 : 0));
+
+        buffer.put((byte) player.engraving.length());
+        buffer.put(player.engraving.getBytes(StandardCharsets.UTF_8));
+
+        return buffer.array();
+    }
+}

src/main/java/eu/m724/musicPlugin/item/PortableMediaPlayer.java

@@ -0,0 +1,79 @@
+package eu.m724.musicPlugin.item;
+
+import net.md_5.bungee.api.ChatColor;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemFlag;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.persistence.PersistentDataType;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class PortableMediaPlayer {
+    private static NamespacedKey namespacedKey = new NamespacedKey("tweaks724", "player");
+
+    public final int id;
+
+    // TODO configurable
+    public final int storageSeconds = 600;
+    public final int audioBitrate = 32000;
+
+    public final boolean premium;
+    public final String engraving;
+
+    SongLibrary library;
+
+    public PortableMediaPlayer(int id, boolean premium, String engraving) {
+        this.id = id;
+        this.premium = premium;
+        this.engraving = engraving;
+    }
+
+    public static PortableMediaPlayer create(boolean premium, String engraving) {
+        var pmp = new PortableMediaPlayer(ThreadLocalRandom.current().nextInt(), premium, engraving);
+        CompletableFuture.runAsync(() -> {
+            try {
+                ItemStorage.getInstance().savePortableMediaPlayer(pmp);
+            } catch (IOException ex) {
+                ex.printStackTrace();
+            }
+        });
+        return pmp;
+    }
+
+    public ItemStack getItemStack() {
+        var is = new ItemStack(Material.IRON_INGOT);
+        var meta = is.getItemMeta();
+
+        meta.addEnchant(Enchantment.UNBREAKING, 1, false);
+        meta.addItemFlags(ItemFlag.HIDE_ENCHANTS);
+        meta.getPersistentDataContainer().set(namespacedKey, PersistentDataType.INTEGER, id);
+        if (engraving != null)
+            meta.setLore(List.of(premium ? (ChatColor.GOLD + "" + ChatColor.BOLD + engraving) : (ChatColor.GRAY + ChatColor.stripColor(engraving))));
+
+        is.setItemMeta(meta);
+
+        return is;
+    }
+
+    public static CompletableFuture<PortableMediaPlayer> fromItemStack(ItemStack itemStack) {
+        return CompletableFuture.supplyAsync(() -> {
+            var meta = itemStack.getItemMeta();
+            if (meta == null) return null;
+
+            var id = meta.getPersistentDataContainer().get(namespacedKey, PersistentDataType.INTEGER);
+            if (id == null) return null;
+
+            try {
+                return ItemStorage.getInstance().getPortableMediaPlayer(id);
+            } catch (IOException e) {
+                throw new CompletionException(e);
+            }
+        });
+    }
+}

src/main/java/eu/m724/musicPlugin/item/SongLibrary.java

@@ -0,0 +1,8 @@
+package eu.m724.musicPlugin.item;
+
+import java.util.List;
+
+public class SongLibrary {
+    private List<String> library;
+    private int playingIndex = 0;
+}

src/main/java/eu/m724/musicPlugin/player/EntityMusicPlayer.java

@@ -19,7 +19,7 @@ public class EntityMusicPlayer extends MusicPlayer {
                 api.fromEntity(entity)
         );
 
-        channel.setCategory("music724");
+        channel.setCategory("musicc");
         channel.setDistance(32);
 
         return channel;

src/main/java/eu/m724/musicPlugin/player/StaticMusicPlayer.java

@@ -20,7 +20,7 @@ public class StaticMusicPlayer extends MusicPlayer {
                 api.createPosition(location.getX(), location.getY(), location.getZ())
         );
 
-        channel.setCategory("music724");
+        channel.setCategory("musicc");
         channel.setDistance(32);
 
         return channel;

src/main/resources/plugin.yml

@@ -27,4 +27,5 @@ commands:
     usage: /<command>
   resume:
     description: Resumes playback
-    usage: /<command>
+    usage: /<command>
+  pmp: