const uid = require("cuid");

function Neuron() {
  this.id = uid(); // ID
  this.bias = bias == undefined ? Math.random() * 2 - 1 : bias; // this.bias ∈ ℝ && -1 < this.bias < 1

  // Incoming Connections
  this.incoming = {
    neurons: {}, // new Map()
    weights: {} // new Map()
  }
  // Outgoing Connections
  this.outgoing = {
    neurons: {}, // new Map()
    weights: {} // new Map()
  }

  this._output; // f'(x)
  this.output; // f(x)
  this.error; // E'(f(x))

  this.connect = function(neuron, weight) {
    this.outgoing.neurons[neuron.id] = neuron;
    neuron.incoming.neurons[this.id] = this;
    this.outgoing.weights[neuron.id] = neuron.incoming.weights[this.id] = weight == undefined ? Math.random() * 2 - 1 : weight; // weight ∈ ℝ && -1 < weight < 1
  }
}

module.exports = Neuron;