AOC Part 3.2

aoc-3-2.js

class Plotter {
  constructor() {
    this.plots = {
      wire1: {},
      wire2: {},
      intersects: {}
    }
    this.currentSteps = 0
  }

  plotWires(wire1, wire2) {
    let position = {
      x: 0,
      y: 0
    }

    wire1.forEach((point) => this.plot(point, position, this.plots.wire1))
    position = {
      x: 0,
      y: 0
    }
    this.currentSteps = 0
    wire2.forEach((point) => this.plot(point, position, this.plots.wire2))
    Object.keys(this.plots.wire1).forEach(plot => {
      if (this.plots.wire2[plot] && plot != '0,0') {
        let point = plot.split(",")
        point = {
          x: point[0],
          y: point[1]
        }
        // const distance = Math.abs(point.x-0) + Math.abs(point.y-0);
        if (!this.plots.intersects[this.plots.wire2[plot]]) {
          this.plots.intersects[this.plots.wire2[plot]] = point
        }
      }
    })
    const min = Math.min.apply(null, Object.keys(this.plots.intersects).map((plot) => {
      let point = this.plots.intersects[Number(plot)]
      point = point.x + ','  +  point.y
      return this.plots.wire1[point] + this.plots.wire2[point]
    }))
    console.log('Combined minimum steps to first intersection:', min)
  }

  plot(point, position, points) {
    const direction = point[0]
    const value = Number(point.slice(1, point.length))
    switch (direction) {
      case "R":
        for (var i = 0; i < value; i++) {
          points[position.x + "," + position.y] = this.currentSteps
          this.currentSteps++
          position.x += 1
        }
        break
      case "U":
        for (var i = 0; i < value; i++) {
          points[position.x + "," + position.y] = this.currentSteps
          this.currentSteps++
          position.y += 1
        }
        break
      case "D":
        for (var i = 0; i < value; i++) {
          points[position.x + "," + position.y] = this.currentSteps
          this.currentSteps++
          position.y -= 1
        }
        break
      case "L":
        for (var i = 0; i < value; i++){
          points[position.x + "," + position.y] = this.currentSteps
          this.currentSteps++
          position.x -= 1
        }
        break
    }
  }
}

const wirePlotter = new Plotter()
wirePlotter.plotWires(wire1, wire2)