export class Block {
    constructor(id, pos, state) {
        this.id = id;
        this.pos = pos;
        this.state = state;
    }
}

export class World {
    constructor() {
        this.blocks = new Map();
        this.listeners = new Set();
    }

    subscribe(callback) {
        this.listeners.add(callback);
        return () => this.listeners.delete(callback);
    }

    notify() {
        for (const listener of this.listeners) listener();
    }

    set(id, x, y, z, state = {}) {
        const key = `${x},${y},${z}`;
        this.blocks.set(key, new Block(id, [x, y, z], state));
        this.notify();
    }

    del(x, y, z) {
        if (this.blocks.delete(`${x},${y},${z}`)) {
            this.notify();
        }
    }

    get(x, y, z) {
        return this.blocks.get(`${x},${y},${z}`);
    }
}