import i2c from 'i2c-bus'
import pify from 'pify'

export default class Bus {
  constructor(busnum=1) {
    this.busnum = busnum
    this.bus = i2c.open(this.busnum, () => {})
  }

  // see https://github.com/fivdi/i2c-bus#busi2cfuncscb  for list of functions that can be promisified

  scan() { return pify(this.bus.scan).bind(this.bus)() }
  close() { return pify(this.bus.close).bind(this.bus)() }

  readRaw(address, length, buffer) {
    return pify(this.bus.i2cRead).bind(this.bus)(address, length, buffer)
  }

  writeRaw(address, length, buffer) {
    return pify(this.bus.i2cWrite).bind(this.bus)(address, length, buffer)
  }

  read(address, cmd) {
    // console.log('read: address, cmd', address, cmd)
    return pify(this.bus.readByte).bind(this.bus)(address, cmd)
  }

  write(address, cmd, byte) {
    // console.log('write: address, cmd, byte', address, cmd, byte)
    return pify(this.bus.writeByte.bind(this.bus))(address, cmd, byte)
  }

  read2(address, cmd) {
    return pify(this.bus.readWord.bind(this.bus))(address, cmd)
  }

  write2(address, cmd, bytes) {
    return pify(this.bus.writeWord.bind(this.bus))(address, cmd, bytes)
  }

  receive(address) {
    // console.log('receivebyte', address)
    return pify(this.bus.receiveByte.bind(this.bus))(address)
  }

  send(address, byte) {
    // console.log('sendbyte', address,byte)
    return pify(this.bus.sendByte.bind(this.bus))(address, byte)
  }


} // end of Bus Class