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

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

// Portal frame block → transfer target mapping. The frame is the floor block;
// the walk-through field column above it inherits the destination by looking down.
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" },
};

const PORTAL_FIELD_BLOCK = "silverlabs:portal_field";
const PORTAL_LABEL_ENTITY = "silverlabs:portal_label";

// Coordinate-based portal zones (fallback detection + auto-spawn anchors).
// `frame_y` is the floor block where the destination frame sits; the field
// blocks are placed at frame_y+1 and frame_y+2 (2-tall walk-through column),
// and the floating label entity sits at frame_y+3.5.
const PORTAL_ZONES = [
  { name: "Jamie's World", x: 436, y: 66, z: -296, frame_y: 66, host: "10.0.0.247", port: 19133, color: "§a" },
  { name: "Lyla's World",  x: 462, y: 65, z: -322, frame_y: 65, host: "10.0.0.247", port: 19134, color: "§d" },
  { name: "Lyla's World",  x: 474, y: 65, z: -281, frame_y: 65, host: "10.0.0.247", port: 19134, color: "§d", label_suffix: " (Super Kitties)" },
  { name: "Mya's World",   x: 488, y: 66, z: -296, frame_y: 66, 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 fx = Math.floor(pos.x);
  const fy = Math.floor(pos.y);
  const fz = Math.floor(pos.z);
  const blockAtFeet = dimension.getBlock({ x: fx, y: fy, z: fz });
  const blockHead  = dimension.getBlock({ x: fx, y: fy + 1, z: fz });
  const blockBelow = dimension.getBlock({ x: fx, y: fy - 1, z: fz });

  // Walk-through portal field: scan downward for the destination frame block.
  for (const b of [blockAtFeet, blockHead]) {
    if (b?.typeId === PORTAL_FIELD_BLOCK) {
      for (let dy = 1; dy <= 4; dy++) {
        const probe = dimension.getBlock({ x: fx, y: fy - dy, z: fz });
        const dest = probe && PORTAL_BLOCKS[probe.typeId];
        if (dest) return dest;
      }
    }
  }

  // Legacy: standing on a frame block directly.
  return PORTAL_BLOCKS[blockAtFeet?.typeId] || PORTAL_BLOCKS[blockBelow?.typeId] || 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, { hostname: portal.host, port: 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);
});

// ─── Walk-through portal fields + floating destination labels ──
// For each known portal zone, place a 2-block-tall column of `portal_field`
// blocks (no collision, translucent, light-emitting) directly above the frame
// block, and summon an invisible `portal_label` entity above with the
// destination world's name visible as a floating tag.

function ensurePortalField(overworld, x, fy, z) {
  for (const dy of [1, 2]) {
    try {
      const b = overworld.getBlock({ x, y: fy + dy, z });
      if (!b) continue;
      if (b.typeId !== PORTAL_FIELD_BLOCK) {
        overworld.runCommand(`setblock ${x} ${fy + dy} ${z} ${PORTAL_FIELD_BLOCK}`);
      }
    } catch (_) { /* chunks may be unloaded; retried next boot */ }
  }
}

function ensurePortalLabel(overworld, zone) {
  const labelY = zone.frame_y + 3.5;
  // Check if a label already exists nearby; replace its tag if outdated.
  let existing = null;
  try {
    const matches = overworld.getEntities({
      type: PORTAL_LABEL_ENTITY,
      location: { x: zone.x + 0.5, y: labelY, z: zone.z + 0.5 },
      maxDistance: 1.5,
    });
    existing = matches[0] || null;
  } catch (_) {}

  const tag = `${zone.color}${zone.name}${zone.label_suffix || ""}`;
  if (existing) {
    try { existing.nameTag = tag; } catch (_) {}
    return;
  }
  try {
    const entity = overworld.spawnEntity(
      PORTAL_LABEL_ENTITY,
      { x: zone.x + 0.5, y: labelY, z: zone.z + 0.5 }
    );
    if (entity) {
      try { entity.nameTag = tag; } catch (_) {}
    }
  } catch (_) { /* chunks may be unloaded */ }
}

function placePortalDressing() {
  const overworld = world.getDimension("overworld");
  for (const zone of PORTAL_ZONES) {
    if (zone.frame_y === undefined) continue;
    ensurePortalField(overworld, zone.x, zone.frame_y, zone.z);
    ensurePortalLabel(overworld, zone);
  }
}

// Initial place + periodic re-ensure (handles chunk loading after first attempt).
system.runTimeout(() => placePortalDressing(), 40);
system.runInterval(() => placePortalDressing(), 600); // every 30s

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