bodyguards.js

const { parentPort, workerData } = require('worker_threads')
const mineflayer = require('mineflayer')
const toolPlugin = require('mineflayer-tool').plugin
const armorManager = require('mineflayer-armor-manager')
const autoeat = require('mineflayer-auto-eat')
const pvp = require('mineflayer-pvp').plugin
const { pathfinder, Movements, goals } = require('mineflayer-pathfinder')

const bossName = process.argv[4] || workerData.bossName;
const prefix = process.argv[5] || workerData.prefix;

const server = {
	address: process.argv[2] || workerData.address,
	port: process.argv[3] || workerData.port,
};
const personalSpace = 5;
const botCount = process.argv[6] || workerData.botCount;
var offset = 0;
var bots = [];

var target;
var defaultMove;

function createBot() {
	//Log in as a new bot to the server
	let bot = mineflayer.createBot({
		host: server.address,
		port: server.port,
		username: `${prefix}#${bots.length}`,
		viewDistance: "tiny",
	});
	bot.id = bots.length;
	bot.direction = Math.PI * 2 / botCount * bots.length;

	// Loading plugins
	bot.loadPlugin(pvp)
	bot.loadPlugin(pathfinder)
	bot.loadPlugin(armorManager)
	bot.loadPlugin(toolPlugin)

	//Log errors and kick messages
	bot.on('kicked', (reason, loggedIn) => console.log(reason, loggedIn));
	bot.on('error', err => console.log(err));

	bot.once("spawn", () => {
		bot.chat('I am the bodyguard of ' + bossName)
	})

	bot.on('playerCollect', (collector, itemDrop) => {
		if (collector !== bot.entity) return

		setTimeout(() => {
			const sword = bot.inventory.items().find(item => item.name.includes('sword'))
			if (sword) bot.equip(sword, 'hand')
		}, 150)
	})

	bot.on('playerCollect', (collector, itemDrop) => {
		if (collector !== bot.entity) return

		setTimeout(() => {
			const shield = bot.inventory.items().find(item => item.name.includes('shield'))
			if (shield) bot.equip(shield, 'off-hand')
		}, 250)
	})

	bot.on('spawn', () => {
		defaultMove = new Movements(bot);
	})

	//Do this every time the bot moves
	bot.on('move', () => {
		let boss = bot.players[bossName];
		//Abort if the boss is not on the server
		if (!boss) return;
		boss = boss.entity;
		//Abort if the boss is not close
		if (!boss) return;

		offset = boss.yaw;
		//Location is where the bot is supposed to be headed
		let location;

		if (target) {
			//If there is a target (enemy) to attack, make them the target location
			location = target.position;
		} else {
			//If there is no enemy (no combat), return to or keep staying with boss
			let x = Math.sin(bot.direction + offset) * personalSpace;
			let z = Math.cos(bot.direction + offset) * personalSpace;
			//Set the headed location to your position next to boss
			location = boss.position.offset(x, 0, z);
		}
		//Face the location it is heading
		bot.lookAt(location);
		//If in combat, hit the enemy
		if (target) bot.attack(target);
		//If it is not yet the amount of blocks "personalSpace" away from the location, walk
		if (bot.entity.position.xzDistanceTo(location) > personalSpace) {
			bot.pathfinder.setMovements(defaultMove);
			bot.pathfinder.setGoal(new goals.GoalBlock(location.x, location.y, location.z));
			// Face the location it is heading
			bot.lookAt(location);
		}
	});
	return (bot);
}

function mainChat(username, message) {
	//Ignore messages that are not from the boss
	if (username != bossName) return;
	//Boss's command parts as an array, e.g. ["kill, "jeb_"]
	let tokens = message.split(' ');

	switch (tokens[0]) {
		case 'kill':
			bots[0].chat("Received.");
			//Set the target to the nearest entity that has the username by what the boss said
			target = bots[0].nearestEntity((entity) => {
				return (entity.displayName == tokens[1] || entity.username == tokens[1]);
			});
			console.log(target);
			break;
		case 'halt':
			bots.chat("Received.")
			target = null;
		case 'cease':
			process.exit(0);
	}
}

function populate() {
	//Spawn 1 Guard
	bots.push(createBot());
	if (bots.length < botCount) {
		setTimeout(populate, process.argv[7] * 1000);
	} else {
		//Do this when all bots are spawned
		console.log("Ready!");
		bots[0].on('chat', mainChat);
		//When an entity disappears (quits, dies etc.), and it's the target, remove the target
		bots[0].on('entityGone', (entity) => {
			if (entity != target) return;
			target = 0;
		});
		//When an entity gets harmed
		bots[0].on('entityHurt', (entity) => {
			//Ignore if the harmed entity is not the boss
			if (entity.username != bossName) return;

			//Select the entity that hurt the boss, by selecting the nearest entity that is not the boss or another Guard
			//This needs work :/
			target = bots[0].nearestEntity((entity) => {
				return (entity.username != bossName && !(entity.username || '').startsWith(prefix));
			});
		});
	}
}

//Begin the Guard populating!
populate();