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

class HeartbeatMessage {
  constructor(config, crypto, logger, data = null) {
    this.config = config
    this.crypto = crypto
    this.logger = logger
    this.type = 0
    this.data = data
  }

  encode() {
    const stream = new ByteStream()

    const timestamp = Math.floor(Date.now() / 1000)
    stream.writeUInt32(timestamp)

    // Client status
    stream.writeUInt8(1) // 1 = alive

    stream.writeUInt32(this.data?.sequence || 0)

    this.logger.debug(`Encoding HeartbeatMessage`, {
      timestamp: timestamp,
      sequence: this.data?.sequence || 0,
    })

    return stream.getBuffer()
  }

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

    const data = {
      timestamp: stream.readUInt32(),
      status: stream.readUInt8(),
      sequence: stream.readUInt32(),
    }

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

  getType() {
    return this.type
  }
}

module.exports = HeartbeatMessage