minecraft-aiworld/lobby-addon/lobby_transfer_BP/scripts/main.js

import { world, system } from "@minecraft/server";
import { transferPlayer } from "@minecraft/server-admin";

// Portal block → transfer target mapping (custom blocks — priority detection)
const PORTAL_BLOCKS = {
  "silverlabs:portal_jamie": { name: "Jamie's World", host: "10.0.0.247", port: 19133, color: "§a" },
  "silverlabs:portal_lyla":  { name: "Lyla's World",  host: "10.0.0.247", port: 19134, color: "§d" },
  "silverlabs:portal_mya":   { name: "Mya's World",   host: "10.0.0.247", port: 19135, color: "§b" },
};

// Coordinate-based portal zones (fallback detection)
const PORTAL_ZONES = [
  { name: "Jamie's World", x: 436, y: 66, z: -296, host: "10.0.0.247", port: 19133, color: "§a" },
  { name: "Lyla's World",  x: 462, y: 65, z: -322, host: "10.0.0.247", port: 19134, color: "§d" },
  { name: "Lyla's World",  x: 474, y: 65, z: -281, host: "10.0.0.247", port: 19134, color: "§d" }, // Super Kitties portal
  { name: "Mya's World",   x: 488, y: 66, z: -296, host: "10.0.0.247", port: 19135, color: "§b" },
];

const PORTAL_RADIUS_X = 2.5;
const PORTAL_RADIUS_Z = 2.0;
const PORTAL_RADIUS_Y = 2.0;
const COOLDOWN_TICKS = 100; // 5 seconds cooldown
const SPAWN_PROTECTION_TICKS = 200; // 10 seconds — ignore portal detection after spawn

// Track cooldowns per player
const cooldowns = new Map();
// Track when players spawned (to prevent transfer loop on arrival)
const spawnTicks = new Map();

world.afterEvents.playerSpawn.subscribe((event) => {
  spawnTicks.set(event.player.id, system.currentTick);
});

/**
 * Check if player is standing on/in a custom portal block (priority method).
 * Returns the portal config or null.
 */
function checkBlockPortal(player) {
  const pos = player.location;
  const dimension = player.dimension;
  const blockAtFeet = dimension.getBlock({ x: Math.floor(pos.x), y: Math.floor(pos.y), z: Math.floor(pos.z) });
  const blockBelow = dimension.getBlock({ x: Math.floor(pos.x), y: Math.floor(pos.y) - 1, z: Math.floor(pos.z) });

  const feetId = blockAtFeet?.typeId;
  const belowId = blockBelow?.typeId;

  return PORTAL_BLOCKS[feetId] || PORTAL_BLOCKS[belowId] || null;
}

/**
 * Check if player is within a coordinate-based portal zone (fallback method).
 * Returns the portal config or null.
 */
function checkZonePortal(player) {
  const pos = player.location;
  for (const portal of PORTAL_ZONES) {
    const dx = Math.abs(pos.x - portal.x);
    const dy = Math.abs(pos.y - portal.y);
    const dz = Math.abs(pos.z - portal.z);
    if (dx < PORTAL_RADIUS_X && dy < PORTAL_RADIUS_Y && dz < PORTAL_RADIUS_Z) {
      return portal;
    }
  }
  return null;
}

system.runInterval(() => {
  for (const player of world.getAllPlayers()) {
    const playerId = player.id;

    // Check cooldown
    const lastTransfer = cooldowns.get(playerId) || 0;
    if (system.currentTick - lastTransfer < COOLDOWN_TICKS) continue;

    // Skip if player just spawned (prevents loop when arriving from child world)
    const spawnedAt = spawnTicks.get(playerId) || 0;
    if (system.currentTick - spawnedAt < SPAWN_PROTECTION_TICKS) continue;

    // Hybrid detection: custom block first, then coordinate fallback
    const portal = checkBlockPortal(player) || checkZonePortal(player);
    if (!portal) continue;

    cooldowns.set(playerId, system.currentTick);

    // Show title notification
    player.runCommand(`titleraw @s title {"rawtext":[{"text":"${portal.color}${portal.name}"}]}`);
    player.runCommand(`titleraw @s subtitle {"rawtext":[{"text":"§7Transferring..."}]}`);
    player.sendMessage(`§6Transferring to ${portal.name}...`);

    // Teleport player away from portal before transfer so their saved position
    // is NOT on the portal (prevents re-transfer loop when they return to lobby)
    const safePos = player.location;
    safePos.z += 4; // Move 4 blocks away from portals (portals are at z=-24)
    player.teleport(safePos);

    // Wait 5 ticks for position to save, then transfer.
    // transferPlayer from @minecraft/server-admin beta API — requires gametest experiment + permissions.json allows server-admin.
    system.runTimeout(() => {
      try {
        transferPlayer(player, portal.host, portal.port);
      } catch (e) {
        player.sendMessage(`§cTransfer failed: ${e.message}`);
      }
    }, 5);
  }
}, 10); // Check every half second

// Clean up tracking when players leave
world.afterEvents.playerLeave.subscribe((event) => {
  cooldowns.delete(event.playerId);
  spawnTicks.delete(event.playerId);
});

// ─── Place signs above each portal on load ──────────────────────

function placePortalSigns() {
  const overworld = world.getDimension("overworld");
  const signs = [
    { x: 438, y: 71, z: -296, name: "Jamie's", color: "§a", facing: 5 },  // east-facing
    { x: 462, y: 71, z: -320, name: "Lyla's",  color: "§d", facing: 3 },  // south-facing
    { x: 486, y: 71, z: -296, name: "Mya's",   color: "§b", facing: 4 },  // west-facing
    { x: 474, y: 74, z: -281, name: "Super Kitties\n§fLyla's", color: "§d", facing: 2 },  // north-facing (Super Kitties portal)
  ];

  for (const sign of signs) {
    try {
      overworld.runCommand(`setblock ${sign.x} ${sign.y} ${sign.z} oak_wall_sign ["facing_direction":${sign.facing}]`);
    } catch (e) {
      // Non-fatal — chunks may not be loaded
    }
  }

  system.runTimeout(() => {
    for (const sign of signs) {
      try {
        const block = overworld.getBlock({ x: sign.x, y: sign.y, z: sign.z });
        if (!block) continue;
        const signComponent = block.getComponent("minecraft:sign");
        if (!signComponent) continue;
        signComponent.setText(`${sign.color}${sign.name}\n${sign.color}World\n§7▼ Step in ▼`);
      } catch (e) {
        // Non-fatal
      }
    }
  }, 10);
}

system.runTimeout(() => {
  placePortalSigns();
}, 40);

system.run(() => {
  world.sendMessage("§6[Hub] §7Portal transfer system loaded!");
});