import { createWriter, IReader, Endian } from "bufferstuff";
import { deflate } from "zlib";
import Chunk from "../Chunk";
import IPacket from "./IPacket";
import Packet from "../enums/Packet";

export default class PacketMapChunk implements IPacket {
	public packetId = Packet.MapChunk;
	public x:number;
	public y:number;
	public z:number;
	public sizeX:number;
	public sizeY:number;
	public sizeZ:number;
	public chunk:Chunk;

	public constructor(x:number, y:number, z:number, sizeX:number, sizeY:number, sizeZ:number, chunk:Chunk) {
		this.x = x;
		this.y = y;
		this.z = z;
		this.sizeX = sizeX;
		this.sizeY = sizeY;
		this.sizeZ = sizeZ;
		this.chunk = chunk;
	}

	public readData(reader:IReader) {
		// TODO: Implement MapChunk reading
		reader.readBool();

		return this;
	}

	public writeData() {
		return new Promise<Buffer>((resolve, reject) => {
			// TODO: Use block and sky nibble array buffers
			/*const fakeLighting = createWriter(Endian.BE, 16384);
			for (let i = 0; i < 16384; i++) {
				fakeLighting.writeUByte(0xFF);
			}*/

			const data = createWriter(Endian.BE)
				// Write Chunk Blocks
				.writeBuffer(this.chunk.getBlockBuffer())
				// Write Chunk Blocks Metadata
				.writeBuffer(this.chunk.getMetadataBuffer())
				// Write Chunk Block Light
				.writeBuffer(this.chunk.blockLight.toBuffer())
				// Write Chunk Sky Light
				.writeBuffer(this.chunk.skyLight.toBuffer());

			deflate(data.toBuffer(), (err, data) => {
				if (err) {
					return reject(err);
				}

				resolve(createWriter(Endian.BE, 18)
					// Write PacketID
					.writeUByte(this.packetId)
					// Write Chunk X
					.writeInt(this.x << 4)
					// Write Chunk Y
					.writeShort(this.y)
					// Write Chunk Z
					.writeInt(this.z << 4)
					// Write Chunk Size X
					.writeUByte(this.sizeX)
					// Write Chunk Size Y
					.writeUByte(this.sizeY)
					// Write Chunk Size Z
					.writeUByte(this.sizeZ)
					// Write Compressed Chunk Data Length
					.writeInt(data.length)
					// Write Compressed Chunk Data
					.writeBuffer(data).toBuffer());
			});
		});
	}
}