import * as _ from '@uci-utils/byte'
import { CHIP, PIN } from './config'
import logger from '@uci-utils/logger'

let log = logger({file:'/src/commands.js', package:'@uci/mcp'})

// TODO add uci debug logging

export default {
  chip:{
  // for custom chip configuration set packet.cfg='custom' then packet.setting should be a
  // configuration byte with given format ('STR' by defaul).
    cfg: async function(packet){
    // first make sure chip is in set to BANK=0 if not already
      let bus = await this.bus.write(0x05,0)
      if (bus.error) return bus
      let setting = {}
      let cfg = packet.cfg || 'default'
      if (cfg === 'custom') setting = {val:packet.setting, fmt:packet.fmt || 'STR'}
      else {
        if (CHIP[cfg]) setting = CHIP[cfg]
        else return {error:`no chip settings for ${cfg}`}
      }
      let byte = _.byteFormat(setting.val, { in: setting.fmt, out: 'DEC' })
      if (byte < 128) byte += 128  // make sure BANK=1 remains on
      let reg = this.chip17 ? 0x0A : 0x05
      log.debug ({cmd:'chip.cfg', line:28, msg:'writing chip configuration', chip17:this.chip17, register:reg, id:this.id, address:this.address})
      bus = await this.bus.write(reg,byte)
      if (bus.error) return bus
      bus = await this.bus.read(0x05)
      if (bus.error) return bus
      if (!this.chip17) bus.response = bus.response + 128
      let res = _.byteFormat(bus.response,{in:'DEC',out:'STR'})
      if (res !== setting.val) return { cmd:'reply', error:`chip configuration failed ${res} != ${setting.val} (${cfg})`}
      return { cmd:'reply', response:res }
    }
  },

  // Pin(s) Configurations
  // set is for cfg: 'custom'  assume a setting is zero unless given
  // packet = { pin:, port:, cfg: , set:{dir: 0, ivrt: 0, pullup: 0, intr: 0, usedef: 0,defval: 0} }
  // first get the current byte (pin) state for that setting
  pin:{
    cfg: async function(packet){
      let cfg = {}
      let reply = { cmd:'reply', status:{} }
      packet.config = packet.config || packet.cfg || 'output'
      if (packet.config==='custom') cfg = packet.set
      else cfg = PIN.cfgset[packet.config]
      for(let name of Object.keys(PIN.setting)) {
        let op = cfg[name] ? 'on' : 'off'
        log.debug({cmd:'pin.cfg', line:28, msg:'setting pin register', operation:op, registerName:name, resgisterNum:PIN.setting[name]})
        let busreply = await this.commands.pin._state(packet,op,PIN.setting[name])
        if (busreply.error) return busreply
        reply.status[name] = busreply.status
      }
      return reply
    },

    cfgs: async function({configs}){
      let res = await Promise.all(configs.map(config => this.commands.pin.cfg(config)))
      let error = res.reduce((err,cfg) => {return  (err || !!cfg.error)},false)
      return ({error:error, res:res})
    },

    // status is equivalent to read
    status: async function (packet) {
      if(!this.chip17 && packet.port==='B') return {error:'sent request for port B.  No such port on MCP2008'}
      let reg = packet.reg ? PIN.cmd[packet.reg] : PIN.cmd.gpio
      if (!reg) return {error:`unknown register ${packet.reg}`, packet:packet }
      let pins = parsePins(packet.pins || packet.pin)
      let state = new _.Byte()
      let bus = await this.bus.read(sreg(reg, packet.port))
      if (bus.error) return bus
      state.value = bus.response
      let reply = {
        port:state.toFmt('ARY'),
        pins: pins.value.map(pin => {
          if (state.toFmt('PLC').indexOf(pin) !==-1) return [pin, 'on']
          else return [pin,'off']
        })
      }
      if (packet.pin) reply.state = reply.pins[0][1]
      return reply
    },
    _state: async function(packet,op,reg){
      if(!this.chip17 && packet.port==='B') return {error:'sent request for port B.  No such port on MCP2008'}
      reg = (reg!==undefined)? reg : PIN.cmd.gpio
      log.debug({cmd:'pin._state', line:82, msg:'_state change request', operation:op, register:reg, packet:packet})
      let reply = { cmd:'reply'}
      let pins = parsePins(packet.pins || packet.pin)
      let state = new _.Byte()
      // TODO support setting state on both ports if non given
      let bus = await this.bus.read(sreg(reg,packet.port))
      if (bus.error) return bus
      state.value = bus.response
      bus = await this.bus.write(sreg(reg,packet.port),state.bwOp(pins.value,op,{in:'PLC', out:'DEC'}))
      if (bus.error) return bus
      bus = await this.bus.read(sreg(reg,packet.port))
      if (bus.error) return bus
      state.value = bus.response
      log.debug({cmd:'pin._state', line:94, msg:'after setting pin state', prev:state.prv, new:state.value})
      reply.status = state.bwOp(pins.value,'check',{in:'PLC', out:'PLC'})
      return reply
    },
    // threse three only for output pins
    state : {
      on: async function (packet) {
        return this.commands.pin._state(packet,'on')
      },
      off: async function (packet) {
        return this.commands.pin._state(packet,'off')
      },
      toggle: async function (packet) {
        return this.commands.pin._state(packet,'toggle')
      }
    }
  } // end pin.

}

const parsePins = function(pins) {
  if (typeof pins==='number') pins = [pins]
  if (typeof pins==='string') {
    if (pins==='all') pins = _.byteFormat(255,{in:'DEC', out:'PLC'})
    else {
      pins = pins.split(/[,:\s]+/).map(Number).filter( (x) => !Number.isNaN(x))
    }
  }
  return new _.Byte(pins,'PLC')
}

const sreg = (reg,port) => {
  return reg + ((port==='B') ? 0x10 : 0)
}