var Entity = Java.type('net.minestom.server.entity.Entity');
var Pos = Java.type('net.minestom.server.coordinate.Pos');
var Vec = Java.type('net.minestom.server.coordinate.Vec');
var Component = Java.type('net.kyori.adventure.text.Component');
var NamedTextColor = Java.type('net.kyori.adventure.text.format.NamedTextColor');
var BillboardConstraints = Java.type('net.minestom.server.entity.metadata.display.AbstractDisplayMeta.BillboardConstraints');
var MinecraftServer = Java.type('net.minestom.server.MinecraftServer');

server.log("NPC Text script initializing...");

function spawnFixedNPC() {
    var instanceManager = MinecraftServer.getInstanceManager();
    var instances = instanceManager.getInstances();
    
    if (instances.isEmpty()) {
        server.log("No instances found to spawn NPC!");
        return;
    }

    var instance = instances.iterator().next();
    var pos = new Pos(45.5, 65.0, -80.5);

    // Retrieve EntityTypes via Java helper
    var HUSK = server.getEntityType('HUSK');
    var TEXT_DISPLAY = server.getEntityType('TEXT_DISPLAY');

    if (HUSK == null || TEXT_DISPLAY == null) {
        server.log("Failed to resolve EntityTypes! HUSK=" + HUSK + ", TEXT_DISPLAY=" + TEXT_DISPLAY);
        return;
    }

    // 1. Create the "NPC" (Host) - Husk
    var npc = new Entity(HUSK);
    
    // 2. Create the TextDisplay (Passenger)
    var textDisplay = new Entity(TEXT_DISPLAY);
    var meta = textDisplay.getEntityMeta();
    
    // Configure the text display
    meta.setText(Component.text("I am a fixed NPC!").color(NamedTextColor.YELLOW));
    meta.setBillboardRenderConstraints(BillboardConstraints.CENTER);
    meta.setScale(new Vec(1.0, 1.0, 1.0));
    meta.setBackgroundColor(0); // Transparent

    // 3. Spawn entities
    npc.setInstance(instance, pos).thenAccept(function() {
        textDisplay.setInstance(instance, pos.add(0, 2.5, 0)).thenAccept(function() {
            // 4. Make the TextDisplay ride the NPC
            npc.addPassenger(textDisplay);
            server.log("Spawned fixed NPC at " + pos);
        });
    });
}

// Run immediately
try {
    spawnFixedNPC();
} catch (e) {
    server.log("Error spawning NPC: " + e);
    e.printStackTrace();
}