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

    // Subscribe to changes (returns an unsubscribe function)
    subscribe(callback) {
        this.listeners.add(callback);
        return () => this.listeners.delete(callback);
    }

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

    setBlock(id, x, y, z, props = {}) {
        const key = `${x},${y},${z}`;
        this.blocks.set(key, { id, x, y, z, props });
        this.notify();
    }

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

    updateBlock(x, y, z, newProps) {
        const key = `${x},${y},${z}`;
        const block = this.blocks.get(key);
        if (block) {
            block.props = { ...block.props, ...newProps };
            this.notify();
        }
    }

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