let graph = {
    nodes : [
      {id : "hemp", index: 0, x: 719.1790913580512, y: 326.11409230900296, vy: 0.0009665554475078223, vx: 0.00044710537175425926},
      {id : "permapp", index: 1, x: 473.51321690437135, y: 317.1181430586339, vy: 0.0005811239352358496, vx: 0.0005105059544352408 },
      {id : "spider", index: 2, x: 495.66982580572676, y: 18.53, vy: 0.0007713356454593206, vx: 0.0007887999665437037 },
      {id : "cyberpreneur", index: 3, x: 457.9995206323447, y: 277.13445200140694, vy: 0.0004637678594351416, vx: 0.0007441570379881761 },
      {id : "kaoscube", index: 4, x: 428.05791236956037, y: 237.65121337678465, vy: 0.00037483669542696317, vx: 0.00039028860355878376 },
      {id : "offgrid", index: 5, x: 461.65464520161396, y: 189.18158017082138, vy: -0.00023265081878199873, vx: 0.00006278089396472572 }
  
  ],
  
    links : [
      {source: 0, target: 1, index: 0 },
      {source: 0, target: 2, index: 1 },
      {source: 0, target: 3, index: 2 },
      {source: 0, target: 4, index: 3 },
      {source: 1, target: 2, index: 4 },
      {source: 1, target: 4, index: 5 },
      {source: 2, target: 3 ,index: 6 },
      {source: 2, target: 4 ,index: 7 },
      {source: 2, target: 5 ,index: 8 },
      {source: 4, target: 5 ,index: 9 }
    ],

}

let width = 100;
let height = 200;

const svg = d3.select("#mobile_network").append("svg").attr("viewBox", "0, 0, 100, 200").attr("preserveAspectRatio", "xMidYMid meet"),
    link = svg
      .selectAll(".link")
      .data(graph.links)
      .join("line")
      .classed("link", true),
    node = svg
      .selectAll(".node")
      .data(graph.nodes)
      .join("circle")
      .attr("id", d => d.id)
      .attr("r", 15)
      .classed("node", true)
      .classed("fixed", d => d.fx !== undefined);

const node1 = svg.select("#hemp")
    .attr("fill", "url(#imgHemp)")
    .append("a")
    .attr("xlink:href", "/hemp");

const node2 = svg.select("#permapp")
    .attr("fill", "url(#imgPermapp)");

const node3 = svg.select("#spider")
    .attr("fill", "url(#imgSpider)");

const node4 = svg.select("#cyberpreneur")
    .attr("fill", "url(#imgCyber)");

const node5 = svg.select("#kaoscube")
    .attr("fill", "url(#imgKaos)");

const node6 = svg.select("#offgrid")
    .attr("fill", "url(#imgOff)");

const defs = svg.append("svg:defs");

defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgHemp")
.append("svg:image")
.attr("xlink:href", "/assets/img/hemp.webp")
.attr("width", 35)
.attr("height", 35)
.attr("x", -5 )
.attr("y", 0);

defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgPermapp")
.append("svg:image")
.attr("xlink:href", "/assets/img/v1-permapp.webp")
.attr("width", 35)
.attr("height", 35)
.attr("x", 0 )
.attr("y", 0);

defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgSpider")
.append("svg:image")
.attr("xlink:href", "/assets/img/spider_out.webp")
.attr("width", 34)
.attr("height", 34)
.attr("x", -4 )
.attr("y", -4);

defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgCyber")
.append("svg:image")
.attr("xlink:href", "/assets/img/3d_greenhouse.webp")
.attr("width", 40)
.attr("height", 40)
.attr("x", -5 )
.attr("y", -8);


defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgKaos")
.append("svg:image")
.attr("xlink:href", "/assets/img/cube_space.webp")
.attr("width", 35)
.attr("height", 35)
.attr("x", -6 )
.attr("y", -6);

defs.append("svg:pattern")
.attr("width", "100%")
.attr("height", "100%")
.attr("id", "imgOff")
.append("svg:image")
.attr("xlink:href", "/assets/img/boat_construction.webp")
.attr("width", 35)
.attr("height", 35)
.attr("x", -6 )
.attr("y", -6);


  const simulation = d3
    .forceSimulation()
    .nodes(graph.nodes)
    .force("charge", d3.forceManyBody().strength(-60))
    .force("center", d3.forceCenter(width / 2.1, height / 2.1))
    .force("link", d3.forceLink(graph.links).distance(50))
    .force("collide", d3.forceCollide(22))
    .force("x", d3.forceX(-40))
    .on("tick", tick);


  const drag = d3
    .drag()
    .on("start", dragstart)
    .on("drag", dragged);

// invokes regiserd callback
  node.call(drag).on("click", click);

  function tick() {
    link
      .attr("x1", d => d.source.x)
      .attr("y1", d => d.source.y)
      .attr("x2", d => d.target.x)
      .attr("y2", d => d.target.y);
    node
      .attr("cx", d => d.x)
      .attr("cy", d => d.y);
  }

  // make this work on touch as well

  function click(event, d) {
    delete d.fx;
    delete d.fy;
    d3.select(this).classed("fixed", false);
        simulation.alpha(1).restart();
    
    // on this click display html text box

  }

  function dragstart() {
    d3.select(this).classed("fixed", true);
  }

  function dragged(event, d) {
    d.fx = clamp(event.x, 0, width);
    d.fy = clamp(event.y, 0, height);
    simulation.alpha(1).restart();
  }

function clamp(x, lo, hi) {
    return x < lo ? lo : x > hi ? hi : x;
}

const Nodes = graph.nodes;
const nodeIx = d => d.img
const N = d3.map(Nodes, nodeIx);

const Images = d3.map( Nodes, ( _,i ) => ({ img: N[i] }) );