const ByteStream = require("../../ByteStream/ByteStream")

class ClientHelloMessage {
  constructor(config, crypto, logger, data = null) {
    this.config = config
    this.crypto = crypto
    this.logger = logger
    this.type = 10100
    this.data = data
  }

  encode() {
    const stream = new ByteStream()

    // Protocol version
    stream.writeUInt32(1)

    stream.writeUInt32(this.config.client.version.major)

    stream.writeUInt32(this.config.client.version.major)

    
    stream.writeUInt32(this.config.client.version.minor)

    stream.writeUInt32(this.config.client.version.build)

    stream.writeString("")

    const nonce = this.crypto.generateNonce()
    stream.writeBytes(nonce)

    this.logger.debug(`Encoding ClientHelloMessage`, {
      version: this.config.client.version,
      nonceLength: nonce.length,
    })

    return stream.getBuffer()
  }

  decode(buffer) {
    const stream = new ByteStream(buffer)

    const data = {
      protocolVersion: stream.readUInt32(),
      keyVersion: stream.readUInt32(),
      majorVersion: stream.readUInt32(),
      minorVersion: stream.readUInt32(),
      buildVersion: stream.readUInt32(),
      hash: stream.readString(),
    }

    this.logger.debug(`Decoded ClientHelloMessage`, data)
    return data
  }

  getType() {
    return this.type
  }
}

module.exports = ClientHelloMessage