import * as d3 from 'd3';

const margin = { top: 20, right: 20, bottom: 50, left: 50 },
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

const parseTime = d3.timeParse('%Y-%m-%d');

data.forEach((d: any) => {
  d.date = parseTime(d.date);
  d.km = +d.km;
});

const x = d3.scaleTime()
.domain(d3.extent(data, d => d.date))
.range([0, width]);

const y = d3.scaleLinear()
.domain([0, d3.max(data, d => d.km)])
.range([height, 0]);

const line = d3.line()
.x(d => x(d.date))
.y(d => y(d.km));

const svg = d3.select('#container')
.append('svg')
  .attr('width', width + margin.left + margin.right)
  .attr('height', height + margin.top + margin.bottom)
  .call(responsivefy)
.append('g')
  .attr('transform', `translate(${margin.left},${margin.top})`);

svg.append('path')
.data([data])
.attr('class', 'line')
.attr('d', line);

svg.append('g')
.attr('transform', `translate(0,${height})`)
.call(d3.axisBottom(x));

svg.append('g')
.call(d3.axisLeft(y));


function responsivefy(svg: any) {
  // container will be the DOM element
  // that the svg is appended to
  // we then measure the container
  // and find its aspect ratio
  const container = d3.select(svg.node().parentNode),
      width = parseInt(svg.style('width'), 10),
      height = parseInt(svg.style('height'), 10),
      aspect = width / height;
 
  // set viewBox attribute to the initial size
  // control scaling with preserveAspectRatio
  // resize svg on inital page load
  svg.attr('viewBox', `0 0 ${width} ${height}`)
      .attr('preserveAspectRatio', 'xMinYMid')
      .call(resize);
 
  // add a listener so the chart will be resized
  // when the window resizes
  // multiple listeners for the same event type
  // requires a namespace, i.e., 'click.foo'
  // api docs: https://goo.gl/F3ZCFr
  d3.select(window).on(
      'resize.' + container.attr('id'), 
      resize
  );
 
  // this is the code that resizes the chart
  // it will be called on load
  // and in response to window resizes
  // gets the width of the container
  // and resizes the svg to fill it
  // while maintaining a consistent aspect ratio
  function resize() {
      const w = parseInt(container.style('width'));
      svg.attr('width', w);
      svg.attr('height', Math.round(w / aspect));
  }
}