'use strict'

const Gpio = require('onoff').Gpio

// **********************************

class Interrupt {
  // bus is i2c-bus bus object
  constructor(pin_number, processor, opts = {}) {
    let dtimeout = opts.debounceTimeout ? opts.debounceTimeout : 200
    this.pin = new Gpio(pin_number, 'in', 'falling', { debounceTimeout: dtimeout })
    this.processor = processor
  }

  init() {
    this.addListener(this.processor)
    process.on('SIGINT', function () {
      this.pin.unexport();
    })

  }

  addListener(processor) {
    this.pin.watch((err, value) => {
      if (err) { return Promise.reject(err) }
      return processor
    });
  }

}

module.exports.Interrupt = Interrupt