'use strict'
const Device = require('uci-dev').Device,
  Port = require('uci-gpio').Port,
  _u = require('uci-utils')

class MCP23008 extends Device {
  constructor(busObj, i2cAddress, opts = {}) {
      super(busObj, i2cAddress, opts)
        // opts could pass in array of custom pin config, or single for all, or anything
        // this.registers = registers // load in register database
      this.ports = {}
      opts.portID = 'A'
      opts.pids = opts.pids ? opts.pids : opts.pidsA
      this.ports.A = new Port(opts)
      this.chip_config = opts.chip_config // TODO  allow opts.chip_config to be a byte instead of a string pointer
      this.ports.A.interrupt = opts.interruptA ? opts.interruptA : opts.interrupt
      if (this.ports.A.interrupt) { this.ports.A.interrupt.hook = 'A' }

    } // end constructor

  init() {
    // console.log('chip configuration', chip_config.cmd, chipSetByte())
    // console.log(super.write.toString())
    let jobs = [this.writeChipCfg(this.chip_config)] // configure chip
    for (let port in this.ports) {
      if (this.inter(port)) {
        // console.log('interrupt init', this.inter(port).init().toString())
        // console.log('interrupt', this.inter(port).init)
        jobs.push(this.inter(port).init()) // set up listeners if interrupts exits

        // jobs.push(this.inter(port).init.bind(this.inter(port))())
      }
    }
    jobs.push(this.writePinsCfg())

    return _u.pSeries(jobs)
  }

  start() {
    let starts = []
    for (let port in this.ports) {
      if (this.inter(port)) {
        starts.push(
          this.read(portReg(0x08, port))
          .then(_u.pDelay(100)) // give enough time for mcp to reset its interupt
          .then(() => {
            return this.inter(port).start()
              .then(() => {
                return Promise.resolve(`interrupt port ${port} started`)
              })
          })
        )
      }
    }
    return Promise.all(starts)
  }

  pin(id) { return this.ports.A.pin(id) } // get a reference to a particular pin's object

  pid(address) { return this.ports.A.pid(address) } // return pin id for a given address on a port

  portByPin(id) {
    if (this.ports.A.pin(id)) { return 'A' }
    return false
  }

  inter(port = 'A') {
    return this.ports[port].interrupt
  }

  writeChipCfg(cfg = 'default') {
    let setting = chip_config[cfg]
    let byte = _u.byteFormat(setting.val, { in: setting.fmt,
      out: 'DEC'
    })
    return super.write(chip_config.cmd, byte)
      .then(() => Promise.resolve(`mcp chip config: reg ${chip_config.cmd} byte ${byte} written`))
  }

  // pin configurations should already be set before calling
  writePinsCfg() {
      let jobs = [];
      for (let port in this.ports) {
        for (let setting in registers.pin_config) {
          let reg = registers.pin_config[setting]
          if (port === 'B') { reg = reg + 0x10 } // TODO 0x10 should be based on chip config
          let byte = 0;
          let pins = this.ports[port].allPins
          for (let i = 0; i < 8; i++) {
            let pin = pins[i]
            byte += pin.address.toFmt('DEC') * pin.cfg[setting]
          }
          //console.log(`port ${port} - setting ${setting} - reg ${reg} -  byte ${byte}`)
          jobs.push(
            super.write(reg, byte).then(() => Promise.resolve(`config: wrote ${byte} to register ${reg} on port ${port}`))
          )
        }
      }
      return _u.pSeries(jobs)
    } // end writePinsCfg

  // reads all pins in all ports
  readPins(cmd = 'gpio', fmt) {
    let jobs = []
    let reg = registers.pin_cmd[cmd]
    for (let port in this.ports) {
      jobs.push(() => super.read(reg))
      reg += 0x10
    }
    return _u.pSeries(jobs)
  }

  pinRead(id, opts) {
      let mcpdev = this;
      return new Promise(function (resolve, reject) {
          let cmd = opts.cmd ? opts.cmd : 'gpio'
          let fmt = opts.fmt ? opts.fmt : { in: 'PLC', out: 'PLC' }
          let reg = registers.pin_cmd[cmd]
          let gpio = mcpdev.pin(id)
          if (!gpio) {
            reject('no pin found for given id')
          }
          console.log('id of fired pin', id)
          console.log('port of fired pin', mcpdev.portByPin(id))
          return mcpdev.read(portReg(reg, mcpdev.portByPin(id))).then(resp => {
              resp = _u.byteFormat(resp, { in: 'DEC',
                out: 'ARY'
              })
              let addr = gpio.adr.toFmt('ARY')
                // console.log(addr)
                // console.log(resp)
              resolve(_u.sum(_u.and(addr, resp))) // resolve 1 or 0
            }).catch(err => reject(err)) // end Promise
        }) // end promise

    } // end pinRead

  pinWrite(id, opts) {
      let mcpdev = this;
      return new Promise(function (resolve, reject) {
          let cmd = opts.cmd ? opts.cmd : 'gpio'
          let reg = registers.pin_cmd[cmd]
          let gpio = mcpdev.pin(id, opts.port)
          if (!gpio) {
            reject('no pin found for given id')
          }
          if (gpio.port === 'B') {
            reg = reg + 16
          }
          // call device class read
          // console.log('port - reg', gpio.port, reg)
          return mcpdev.read(reg).then(resp => {
            resp = _u.byteFormat(resp, { in: 'DEC',
              out: 'ARY'
            })
            let addr = gpio.pin.address.toFmt('ARY')
              //  // console.log(addr)
              // console.log(resp)
            resolve(_u.sum(_u.and(addr, resp))) // resolve 1 or 0
          })
        })
        // .then(state => console.log(`pin state ${state}`))
        .catch(err => console.log(err)) // end Promise
    } // end pinRead

} // end 23008
module.exports.MCP23008 = MCP23008

class MCP23017 extends MCP23008 {
  constructor(busObj, i2cAddress, opts) {
    super(busObj, i2cAddress, opts)
      // add a second port
    opts.portID = 'B'
    opts.pids = opts.pidsB
    this.ports.B = new Port(opts)
    this.ports.B.interrupt = opts.interruptB ? opts.interruptB : opts.interrupt
    if (this.ports.B.interrupt) { this.ports.B.interrupt.hook = 'B' }
  }

  pin(id, port) {
    if (!port) {
      return this.ports.A.pin(id) ? this.ports.A.pin(id) : this.ports.B.pin(id)
    }
    return this.ports[port].pin(id)
  }

  pid(address, port) {
    if (!port) {
      return this.ports.A.pid(address)
    }
    return this.ports[port].pid(address)
  }

  portByPin(id) {
    console.log('pin id in portbypin', id)
    if (this.ports.A.pin(id)) { return 'A' }
    if (this.ports.B.pin(id)) { return 'B' }
    return false
  }

} // end MCP23017 Class
module.exports.MCP23017 = MCP23017

function portReg(reg, port) {
  if (port === 'B') { return reg += 0x10 } else { return reg }
}

/* ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
 * or see MCP23017.pdf and MCP 23008.pdf in /docs
 * see table 1.5 and details in sections 1.6.x following
 * !!! for 23017 MUST initialize with bit 7 "BANK" of IOCON = 1 for the addresses below
 * then for all registers add 16 (0x10) to each reg address to talk to PortB pins
 * this will make reg addresses be equilvant for 23008 and PortA of 23017
 * reg addresses in the config objects are all in Hexidecminal
 */
// Chip Configuration to be used with Register  See Page 18 of 23017 doc
let chip_config = {
  // byte: ['NULL','INTPOL','ODR','HAEN','DISSLW','SEQOP','MIRROR','BANK']  // see page 18 of 23017 datasheet for 8 setting details
  cmd: 0x0A, // IOCON.BANK=0 (msb) at powerup so need to use 0x0A, if set to 1 then use
  default: {
    val: '10100010', // Split Banks port A + 0x10 = Port B,(ignored by 23008), Sequential operation disabled, active high=pulldown
    fmt: 'STR'
  },
  oneint: {
    val: '11100100', // same as default execpt int pins connected
    fmt: 'STR'
  }
}

let registers = {
  pin_config: {
    dir: 0,
    ivrt: 1,
    pullup: 6,
    intr: 2,
    usedef: 4,
    defval: 3,
  },
  pin_cmd: {
    intf: 7, // readonly
    intcap: 8, // readonly
    gpio: 9, // read/write
    olat: 10 // read only
  }
}