import i2c from 'i2c-bus'
import pify from 'pify'
// import Base from '@uci/base'
import Base from '../../uci-base/src/base'

export default class Bus extends Base {
  constructor(opts) {
    opts.sockets = opts.sockets || 'us'
    super(opts)
    this.busnum = opts.busnum || 1
    this.i2cbus = i2c.open(this.busnum, () => {})
    this.funcs = bus_funcs
    // this.init = this.init.bind(this)
  }

  async init(){
    // console.log('init', this.rw)
    await super.init()
  }

  async rw (packet){
    // console.dir('=>',packet.bus.fusncs)
    if (!packet.bus.func) return  {error: 'no i2c bus function in packet', packet: packet.bus }
    if (this.funcs[packet.bus.func]) {
      packet.bus.response = await this.funcs[packet.bus.func].bind(this)(packet.bus.args)
      packet.cmd = 'reply'
      return packet
    }
    return  {error: 'no i2c bus function available for packet function', packet: packet.bus }
  }

} // end of Bus Packet Class

const bus_funcs = {

  scan: function () { return pify(this.i2cbus.scan).bind(this.i2cbus)() },
  close: function () { return pify(this.i2cbus.close).bind(this.i2cbus)() },

  readRaw: function (arg) {
    return pify(this.i2cbus.i2cRead).bind(this.i2cbus)(arg.address, arg.length, arg.buffer)
  },

  writeRaw: function (arg) {
    return pify(this.i2cbus.i2cWrite).bind(this.i2cbus)(arg.address, arg.length, arg.buffer)
  },

  read: function (arg) {
  // console.log('read: address, cmd', address, cmd)
    return pify(this.i2cbus.readByte).bind(this.i2cbus)(arg.address, arg.cmd)
  },

  write: function (arg) {
    // console.log('write: address, cmd, byte', arg.address, arg.cmd, arg.byte)
    return pify(this.i2cbus.writeByte.bind(this.i2cbus))(arg.address, arg.cmd, arg.byte)
  },

  read2: function (arg) {
    return pify(this.i2cbus.readWord.bind(this.i2cbus))(arg.address, arg.cmd)
  },

  write2: function (arg) {
    return pify(this.i2cbus.writeWord.bind(this.i2cbus))(arg.address, arg.cmd, arg.bytes)
  },

  receive: function (arg) {
  // console.log('receivebyte', address)
    return pify(this.i2cbus.receiveByte.bind(this.i2cbus))(arg.address)
  },

  send: function (arg) {
  // console.log('sendbyte', address,byte)
    return pify(this.i2cbus.sendByte.bind(this.i2cbus))(arg.address, arg.byte)
  }

}