'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var data;

function getLabelAttribute(node) {
  if (typeof node['https://schema.org/name'] !== "undefined") {
    return 'https://schema.org/name';
  }
  switch (node['@type']) {
    case "https://schema.org/WebSite":
      if (typeof node['https://schema.org/url'] !== "undefined") {
        return 'https://schema.org/url';
      }
      break;
    case "https://schema.org/ImageObject":
      if (typeof node['https://schema.org/caption'] !== "undefined") {
        return 'https://schema.org/caption';
      }
      if (typeof node['https://schema.org/contentUrl'] !== "undefined") {
        return 'https://schema.org/contentUrl';
      }
      break;
    case "https://schema.org/PostalAddress":
      if (typeof node['https://schema.org/addressLocality'] !== "undefined") {
        return 'https://schema.org/addressLocality';
      }
      break;
  }
  return '@id';
}
function getNodeLabel(node) {
  var labelAttr = getLabelAttribute(node);
  var label = node[labelAttr];
  if (typeof label == "undefined") label = node["@id"];
  if (typeof label == "undefined") label = "";
  return label;
}
function getNodeYear(n) {
  if (typeof n['https://schema.org/dateCreated'] !== 'undefined') {
    return n['https://schema.org/dateCreated'].substr(0, 4);
  }
  if (typeof n['https://schema.org/datePublished'] !== 'undefined') {
    return n['https://schema.org/datePublished'].substr(0, 4);
  }
  if (typeof n['https://schema.org/startDate'] !== 'undefined') {
    console.log(n['https://schema.org/startDate']);
    return n['https://schema.org/startDate'].substr(0, 4);
  }
  if (typeof n['https://schema.org/endDate'] !== 'undefined') {
    return n['https://schema.org/endDate'].substr(0, 4);
  }
  if (typeof n['https://schema.org/foundingDate'] !== 'undefined') {
    return n['https://schema.org/foundingDate'].substr(0, 4);
  }
  if (typeof n['https://schema.org/temporalCoverage'] !== 'undefined') {
    if (n['https://schema.org/temporalCoverage'].match(/\d{4}-\d{4}/)) {
      return n['https://schema.org/temporalCoverage'].substr(5, 4);
    }
  }
  return null;
}
function getDisplayAttr(attr) {
  return attr.replace(/.*[#|\/]/, "");
}
/**
Transform a flattened jsonld into a d3 compatible graph
@param Object data flattened jsonld data
@return Object graph has keys "nodes" and "links"
*/
function jsonLdToGraph(data) {
  var nodes = {};
  var links = [];

  // collect all nodes
  for (var nodeId in data) {
    // data[nodeId]["@type"][0] = data[nodeId]["@type"][0];
    nodes[data[nodeId]["@id"]] = data[nodeId];
  }

  // collect all links (separate loop as we need to check nodes)
  for (var _nodeId in data) {
    var node = data[_nodeId];
    var currentId = node["@id"];
    for (var key in node) {
      var nodeAttr = Array.isArray(node[key]) ? node[key] : [node[key]];
      // // relations should always be lists (eases assumptions)
      // if(typeof node[key] !== "Array" && typeof node[key]['id'] !== "undefined") {
      //   node[key] = [node[key]];
      // }
      // every attribute is an Array after flatten(), loop them
      for (var i in nodeAttr) {
        if (key !== "@id" && typeof nodeAttr[i] === "string" && nodes[nodeAttr[i]]) {
          links[links.length] = {
            "source": currentId,
            "target": nodeAttr[i],
            "name": key
          };
        } else if (typeof nodeAttr[i]["@id"] !== "undefined") {
          // if there is just one item, flatten/expand has turned urls in objects with just an id
          // reverse this, as we don't want these separate for this project
          if (Object.keys(nodeAttr[i]).length == 1 && typeof nodes[nodeAttr[i]["@id"]] === "undefined") {
            // skip
            // nodeAttr = nodeAttr[i]["id"];
          } else {
            links[links.length] = {
              "source": currentId,
              "target": nodeAttr[i]["@id"],
              "name": key
            };
          }
        }
      }
    }
  }
  return {
    "nodes": Object.values(nodes),
    "links": links
  };
}

var graph;
// map nodes to their ID
var nodeMap = {};
var linkMap = {};
var breadcrumbs = {};
// load the flattened jsonld file
var requestPromise = fetch('/assets/js/rubenvandeven.jsonld').then(function (r) {
  return r.json();
}).then(function (data) {
  graph = jsonLdToGraph(data['@graph']);
  // create a map of nodes by id.
  for (var i in graph.nodes) {
    nodeMap[graph.nodes[i]['@id']] = graph.nodes[i];
  }
  startGraph(graph);
});

function inCircle(dx, dy, r) {
  // fastest check if in circle: https://stackoverflow.com/a/7227057
  var dxAbs = Math.abs(dx);
  var dyAbs = Math.abs(dy);

  if (dxAbs > r || dyAbs > r) {
    return false;
  } else if (dxAbs + dyAbs <= r) {
    return true;
  } else if (Math.pow(dx, 2) + Math.pow(dy, 2) <= Math.pow(r, 2)) {
    return true;
  } else {
    return false;
  }
}

function createLinkMap(graph) {
  var linkMap = {};
  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = graph['links'][Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var link = _step.value;

      if (typeof linkMap[link['source']] == 'undefined') {
        linkMap[link['source']] = [];
      }
      linkMap[link['source']][linkMap[link['source']].length] = { 'id': link['target'], 'name': link['name'] };

      if (typeof linkMap[link['target']] == 'undefined') {
        linkMap[link['target']] = [];
      }

      linkMap[link['target']][linkMap[link['target']].length] = { 'id': link['source'], 'name': link['name'] };
    }
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  return linkMap;
}

// config
var nodeSize = 40;
var selectedNodeSize = 140;
var firstNodeId = "https://rubenvandeven.com/";

function getSizeForNode(node) {
  if (node.hasOwnProperty('https://schema.org/thumbnailUrl')) return nodeSize;
  //if(weights[node['@id']])
  //  return nodeSize * weights[node['@id']];
  if (node['@id'] == firstNodeId) return nodeSize * 1.2;
  // everynode has at least one link. these should equal 1
  return nodeSize * (.7 + Math.min(20, linkMap[node['@id']].length) / 40);
  return nodeSize;
}

// TODO: make sure, 'shortest' path is favoured.
function createBreadcrumbs(linkMap, srcId) {
  var crumbs = {};

  var createBreadcrumbLayer = function createBreadcrumbLayer(srcId) {
    var path = crumbs[srcId];
    var newPath = path.slice();
    newPath.push(srcId);

    var nextSrcIds = [];
    var _iteratorNormalCompletion2 = true;
    var _didIteratorError2 = false;
    var _iteratorError2 = undefined;

    try {
      for (var _iterator2 = linkMap[srcId][Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
        var link = _step2.value;

        if (typeof crumbs[link['id']] !== 'undefined') continue;
        crumbs[link['id']] = newPath;
        nextSrcIds.push(link['id']);
      }
    } catch (err) {
      _didIteratorError2 = true;
      _iteratorError2 = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion2 && _iterator2.return) {
          _iterator2.return();
        }
      } finally {
        if (_didIteratorError2) {
          throw _iteratorError2;
        }
      }
    }

    return nextSrcIds;
  };
  crumbs[srcId] = [];
  var nextIds = [srcId];
  while (nextIds.length > 0) {
    var newNextIds = [];
    var _iteratorNormalCompletion3 = true;
    var _didIteratorError3 = false;
    var _iteratorError3 = undefined;

    try {
      for (var _iterator3 = nextIds[Symbol.iterator](), _step3; !(_iteratorNormalCompletion3 = (_step3 = _iterator3.next()).done); _iteratorNormalCompletion3 = true) {
        var nextId = _step3.value;

        var r = createBreadcrumbLayer(nextId);
        newNextIds = newNextIds.concat(r);
      }
    } catch (err) {
      _didIteratorError3 = true;
      _iteratorError3 = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion3 && _iterator3.return) {
          _iterator3.return();
        }
      } finally {
        if (_didIteratorError3) {
          throw _iteratorError3;
        }
      }
    }

    nextIds = newNextIds;
  }
  return crumbs;
}

var nodePositions = {};
function startGraph(graph) {

  // set some vars
  var currentNodeIdx = 0;
  var currentNodePositionRadius = 0;
  var types = {};

  linkMap = createLinkMap(graph);
  breadcrumbs = createBreadcrumbs(linkMap, firstNodeId);

  for (var nodeIdx in graph['nodes']) {
    var type = graph['nodes'][nodeIdx]["@type"];
    if (typeof types[type] == 'undefined') {
      types[type] = [];
    }
    types[type].push(nodeIdx);
  }
  var graphControlsEl = document.getElementById('graphControls');
  var typeLinksEl = document.getElementById('typeLinks');
  var showMoreTypeLinksEl = document.getElementById('showMoreTypeLinks');
  var moreTypeLinksEl = document.getElementById('moreTypeLinks');
  var relLinksEl = document.getElementById('relLinks');

  // sort types by count:
  var typeCounts = Object.keys(types).map(function (key) {
    return [key, types[key].length];
  });
  typeCounts.sort(function (first, second) {
    return second[1] - first[1];
  });

  // make controls
  var i = 0;

  var _loop = function _loop(typeCountIdx) {
    var typeName = typeCounts[typeCountIdx][0];
    var typeLinkEl = document.createElement("li");
    var typeLinkAEl = document.createElement("a");
    var typeLinkCountEl = document.createElement("span");
    typeLinkCountEl.innerHTML = typeCounts[typeCountIdx][1];
    typeLinkCountEl.classList.add('typeCount');
    typeLinkAEl.innerHTML = getDisplayAttr(typeName);
    typeLinkAEl.title = typeName;
    typeLinkAEl.addEventListener('click', function () {
      centerByType(typeName);
      // positionNodesInCenter(types[typeName]);
    });
    typeLinkAEl.addEventListener('mouseover', function () {
      var typeNodeEls = document.getElementsByClassName(typeName);
      var _iteratorNormalCompletion7 = true;
      var _didIteratorError7 = false;
      var _iteratorError7 = undefined;

      try {
        for (var _iterator7 = typeNodeEls[Symbol.iterator](), _step7; !(_iteratorNormalCompletion7 = (_step7 = _iterator7.next()).done); _iteratorNormalCompletion7 = true) {
          var typeNodeEl = _step7.value;

          typeNodeEl.classList.add('typeHighlight');
        }
      } catch (err) {
        _didIteratorError7 = true;
        _iteratorError7 = err;
      } finally {
        try {
          if (!_iteratorNormalCompletion7 && _iterator7.return) {
            _iterator7.return();
          }
        } finally {
          if (_didIteratorError7) {
            throw _iteratorError7;
          }
        }
      }
    });
    typeLinkAEl.addEventListener('mouseout', function () {
      var typeNodeEls = document.getElementsByClassName(typeName);
      var _iteratorNormalCompletion8 = true;
      var _didIteratorError8 = false;
      var _iteratorError8 = undefined;

      try {
        for (var _iterator8 = typeNodeEls[Symbol.iterator](), _step8; !(_iteratorNormalCompletion8 = (_step8 = _iterator8.next()).done); _iteratorNormalCompletion8 = true) {
          var typeNodeEl = _step8.value;

          typeNodeEl.classList.remove('typeHighlight');
        }
      } catch (err) {
        _didIteratorError8 = true;
        _iteratorError8 = err;
      } finally {
        try {
          if (!_iteratorNormalCompletion8 && _iterator8.return) {
            _iterator8.return();
          }
        } finally {
          if (_didIteratorError8) {
            throw _iteratorError8;
          }
        }
      }
    });
    typeLinkEl.append(typeLinkAEl);
    typeLinkEl.append(typeLinkCountEl);
    (i < 5 ? typeLinksEl : moreTypeLinksEl).appendChild(typeLinkEl);
    i++;
    // typeLinksEl.appendChild(typeLinkEl);
  };

  for (var typeCountIdx in typeCounts) {
    _loop(typeCountIdx);
  }

  showMoreTypeLinksEl.addEventListener('click', function () {
    document.body.classList.add('showMoreLinks');
    var hideMoreTypeLinks = function hideMoreTypeLinks(e) {
      e.preventDefault();
      e.stopPropagation();
      document.body.removeEventListener('mouseup', hideMoreTypeLinks, true);
      document.body.classList.remove('showMoreLinks');
    };
    document.body.addEventListener('mouseup', hideMoreTypeLinks, true);
  }, false);

  // make svg
  var svg = d3.select("svg"),
      width = +svg.attr("width"),
      height = +svg.attr("height");
  var container = svg.append("g").attr("id", "container");

  var simulation = d3.forceSimulation().force("link", d3.forceLink().id(function (d) {
    return d["@id"];
  }).strength(.005)).force("charge", d3.forceManyBody()) // doesn't seem necessary?
  .force("collision", d3.forceCollide(function (d) {
    return getSizeForNode(d) * 1.1; // avoid overlapping nodes
  }))
  // .force("center", d3.forceCenter(width / 2, height / 2)) // position around center

  // .force("x", d3.forceX())
  // .force("y", d3.forceY())
  // .force("y", d3.forceY())
  ;

  var link = container.append("g").attr("class", "links").selectAll(".relationship").data(graph['links']).enter().append("g").attr("class", function (l) {
    return "relationship " + l.name;
  });
  var linkLine = link
  // .append("line");
  .append("line").attr("marker-end", "url(#arrowHead)");
  var linkText = link.append("text").text(function (l) {
    // l == Object { source: "https://rubenvandeven.com/#codesandmodes", target: "_:b34", name: "https://schema.org/location" }
    return getDisplayAttr(l.name);
  });

  var node = container.append("g").attr("class", "nodes").selectAll(".node").data(graph.nodes).enter().append("g").attr("class", function (d) {
    var baseClasses = 'node ' + d['@type'];
    if (d['@type']) {
      var slashpos = d['@type'].lastIndexOf('/');
      if (slashpos > -1) {
        baseClasses += ' ' + d['@type'].substr(slashpos + 1);
      }
    }
    return baseClasses;
  });
  var getViewbox = function getViewbox() {
    return svg.attr("viewBox").split(" ").map(parseFloat);
  };
  var positionNodesInCenter = function positionNodesInCenter(idxs) {
    setViewboxForceCenter(); // sets forceCx & forceCy
    if ((typeof idxs === 'undefined' ? 'undefined' : _typeof(idxs)) == "object" && idxs !== null && idxs.length == 1) {
      idxs = idxs[0];
    }

    nodePositions = {}; // reset
    if (idxs === null) {
      return;
    } else if ((typeof idxs === 'undefined' ? 'undefined' : _typeof(idxs)) == "object") {
      // array or object -> each
      // calculate grid:
      // let itemsX = 4;
      // let itemsY = Math.ceil(idxs.length/itemsX);
      // console.log(itemsX,itemsY);
      // let rowDiffX = viewBox[3] * (1/(itemsX+1));
      // let rowDiffY = viewBox[2] * (1/(itemsY+1));
      // console.log(rowDiffX, rowDiffY);
      // for (var i = 0; i < idxs.length; i++) {
      //   nodePositions[idxs[i]] = [
      //     cx - itemsX/2*rowDiffX + rowDiffX * ((i % itemsX)),
      //     cy - itemsY/2*rowDiffY  + rowDiffY * (Math.floor(i / itemsX))
      //   ];
      // }
      positionNodesInCircle(idxs);
      // console.log(nodePositions);
    } else {
      nodePositions[idxs] = [forceCx, forceCy];
      // console.log("singleNode", idxs, nodePositions);
    }

    node.each(function (d, nIdx, nodeEls) {
      if (typeof nodePositions[nIdx] != 'undefined') {
        nodeEls[nIdx].classList.add('centeredNode');
        nodeEls[nIdx].classList.add('visibleNode');
      } else {
        nodeEls[nIdx].classList.remove('centeredNode');
        nodeEls[nIdx].classList.remove('visibleNode');
      }
    });

    // restart animation (they call that 'alpha' in d3 force)
    simulation.alpha(1);
    simulation.restart();
  };
  var positionNodesInCircle = function positionNodesInCircle(idxs, r) {
    var viewBox = getViewbox();
    var zoom = getZoomValues();
    setViewboxForceCenter(); // sets forceCx & forceCy
    if (typeof r == 'undefined') {
      if (idxs.length == 1) {
        r = viewBox[2] / 6;
      } else {
        r = viewBox[2] / (4 + Math.max(0, 2.5 - idxs.length));
      }
    }
    currentNodePositionRadius = r;
    var forceCx = viewBox[0] + viewBox[2] / 2 - zoom['dx'];
    var forceCy = viewBox[1] + viewBox[3] / 2 - zoom['dy'];

    var stepSize = 2 * Math.PI / idxs.length;

    for (var i = 0; i < idxs.length; i++) {
      nodePositions[idxs[i]] = [forceCx + Math.sin(stepSize * i) * r, forceCy + Math.cos(stepSize * i) * r];
    }

    // restart animation (they call that 'alpha' in d3 force)
    simulation.alpha(1);
    simulation.restart();
  };
  var centerByType = function centerByType(types, updateHistory) {
    if (typeof updateHistory == 'undefined') {
      updateHistory = true;
    }
    if (!Array.isArray(types)) {
      types = [types];
    }
    var idxs = [];
    for (var idx in graph.nodes) {
      if (types.indexOf(graph.nodes[idx]['@type']) > -1) {
        idxs[idxs.length] = idx;
      }
    }
    deselectNode();
    if (updateHistory) {
      // TODO: working
      console.log(types[0], getDisplayAttr(types[0]), types.map(getDisplayAttr));
      history.pushState({ types: types }, "", "/@type/" + types.map(getDisplayAttr).join("+"));
    } else {
      history.replaceState({ types: types }, "", "/@type/" + types.map(getDisplayAttr).join("+"));
    }
    positionNodesInCenter(idxs.length ? idxs : null);
  };

  var selectedNodeTransition = d3.transition().duration(750).ease(d3.easeLinear);

  var nodeDetailEl = document.getElementById("nodeDetails");

  var createRelationshipEl = function createRelationshipEl(relNode, i) {
    var el = document.createElement("dd");
    el.classList.add('relLink');
    var titleEl = document.createElement('a');
    titleEl.innerHTML = getNodeLabel(relNode);
    var year = getNodeYear(relNode);
    if (year !== null) {
      titleEl.innerHTML += '<span class=\'nodeYear\'>' + getNodeYear(relNode) + '</span>';
    }
    titleEl.classList.add('nodeTitle');
    titleEl.classList.add('nodeTitleNr' + i);
    titleEl.addEventListener('click', function (e) {
      var idx = graph.nodes.indexOf(relNode);
      selectNode(idx);
    });
    var typeEl = document.createElement('a');
    typeEl.classList.add('nodeType');
    typeEl.innerHTML = getDisplayAttr(relNode['@type']);
    typeEl.title = relNode['@type'];
    typeEl.addEventListener('click', function (e) {
      centerByType(relNode['@type']);
    });
    el.appendChild(titleEl);
    el.appendChild(typeEl);
    return el;
  };

  var setDetails = function setDetails(nodeDatum, nodeIdx) {
    document.body.classList.add("detailsOpen");
    scrollToY(0, 4000);
    while (nodeDetailEl.hasChildNodes()) {
      nodeDetailEl.removeChild(nodeDetailEl.lastChild);
    }

    // TODO: replace relUp & relDown with linkMap
    var relUp = [];
    var relDown = [];
    var pageTitles = [];
    var nodeDetailScalerEl = document.createElement('div');
    // nodeDetailScalerEl.innerHTML = `<div id='scalarbar'></div>`;
    nodeDetailScalerEl.id = 'nodeDetailsScaler';
    nodeDetailScalerEl.addEventListener('mousedown', function (e) {
      // console.log('go');
      var drag = function drag(e) {
        // 5px for padding
        nodeDetailEl.style.width = window.innerWidth - e.clientX + 5 + 'px';
      };
      document.body.addEventListener('mousemove', drag);
      document.body.addEventListener('mouseup', function () {
        document.body.removeEventListener('mousemove', drag);
      });
    });
    nodeDetails.appendChild(nodeDetailScalerEl);

    var breadcrumbsEl = document.createElement('ul');
    breadcrumbsEl.classList.add('breadcrumbs');

    var _loop2 = function _loop2(crumbNodeId) {
      var crumbWrapEl = document.createElement('li');
      var crumbEl = document.createElement('span');
      crumbEl.classList.add('crumb');
      crumbEl.addEventListener('click', function (e) {
        var idx = graph.nodes.indexOf(nodeMap[crumbNodeId]);
        selectNode(idx);
      });
      crumbEl.innerHTML = '' + getNodeLabel(nodeMap[crumbNodeId]);
      var nodeYear = getNodeYear(nodeMap[crumbNodeId]);
      if (nodeYear !== null) {
        crumbEl.innerHTML += '<span class=\'nodeYear\'>' + nodeYear + '</span>';
      }
      crumbWrapEl.appendChild(crumbEl);
      breadcrumbsEl.appendChild(crumbWrapEl);
      pageTitles.push(getNodeLabel(nodeMap[crumbNodeId]));
    };

    var _iteratorNormalCompletion4 = true;
    var _didIteratorError4 = false;
    var _iteratorError4 = undefined;

    try {
      for (var _iterator4 = breadcrumbs[nodeDatum['@id']][Symbol.iterator](), _step4; !(_iteratorNormalCompletion4 = (_step4 = _iterator4.next()).done); _iteratorNormalCompletion4 = true) {
        var crumbNodeId = _step4.value;

        _loop2(crumbNodeId);
      }
    } catch (err) {
      _didIteratorError4 = true;
      _iteratorError4 = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion4 && _iterator4.return) {
          _iterator4.return();
        }
      } finally {
        if (_didIteratorError4) {
          throw _iteratorError4;
        }
      }
    }

    nodeDetailEl.appendChild(breadcrumbsEl);
    pageTitles.push(getNodeLabel(nodeDatum));

    var titleAttr = getLabelAttribute(nodeDatum);
    var titleEl = document.createElement('h2');
    titleEl.innerHTML = getNodeLabel(nodeDatum);

    var typeEl = document.createElement('span');
    typeEl.classList.add('nodeType');
    typeEl.innerHTML = getDisplayAttr(nodeDatum['@type']);
    typeEl.title = nodeDatum['@type'];
    typeEl.addEventListener('click', function (e) {
      centerByType(nodeDatum['@type']);
    });
    titleEl.appendChild(typeEl);
    nodeDetailEl.appendChild(titleEl);

    var listEl = document.createElement("dl");
    // listEl.innerHTML += `<dt>type</dt><dd>${nodeDatum['@type']}</dd>`;

    var skipNodeAttributes = ['@id', 'x', 'y', 'index', '@type', 'vy', 'vx', 'fx', 'fy', 'leftX', 'rightX'];
    if (titleAttr !== 'https://schema.org/contentUrl') {
      skipNodeAttributes[skipNodeAttributes.length] = titleAttr;
    }
    for (var attr in nodeDatum) {
      if (skipNodeAttributes.indexOf(attr) != -1) {
        continue;
      }

      // approach all as array
      var nodeAttr = Array.isArray(nodeDatum[attr]) ? nodeDatum[attr] : [nodeDatum[attr]];
      for (var _i in nodeAttr) {
        // check if relationship:
        if (typeof nodeAttr[_i] === "string" && nodeMap[nodeAttr[_i]]) {
          continue;
        } else if (typeof nodeAttr[_i]['@id'] !== 'undefined') {
          continue;
        }
        if (attr == 'https://schema.org/url' || attr == 'http://www.w3.org/2000/01/rdf-schema#seeAlso') {
          listEl.innerHTML += '<dt class=\'dt-' + getDisplayAttr(attr) + '\' title=\'' + attr + '\'>' + getDisplayAttr(attr) + '</dt><dd class=\'dd-' + getDisplayAttr(attr) + '\'><a href=\'' + nodeAttr[_i] + '\'>' + nodeAttr[_i] + '</a></dd>';
        } else if (attr == 'https://schema.org/embedUrl') {
          listEl.innerHTML += '<dt class=\'dt-' + getDisplayAttr(attr) + '\' title=\'' + attr + '\'>' + getDisplayAttr(attr) + '</dt><dd class=\'dd-' + getDisplayAttr(attr) + '\'><a href=\'' + nodeAttr[_i] + '\'>' + nodeAttr[_i] + '</a></dd>';
          listEl.innerHTML += '<dd class=\'dd-embed\'><embed src=\'' + nodeAttr[_i] + '\'></embed></dd>';
        } else if (attr == 'https://schema.org/contentUrl') {
          listEl.innerHTML += '<dt class=\'dt-' + getDisplayAttr(attr) + '\' title=\'' + attr + '\'>' + getDisplayAttr(attr) + '</dt><dd class=\'dd-' + getDisplayAttr(attr) + '\'><a href=\'' + nodeAttr[_i] + '\'>' + nodeAttr[_i] + '</a></dd>';
          if (nodeDatum['@type'] == 'https://schema.org/VideoObject') {
            var videoType = nodeAttr['https://schema.org/encodingFormat'] ? 'type=\'' + nodeAttr['https://schema.org/encodingFormat'] + '\'' : "";
            var poster = nodeAttr['https://schema.org/thumbnailUrl'] ? 'poster=\'' + nodeAttr['https://schema.org/thumbnailUrl'] + '\'' : "";
            listEl.innerHTML += '<dd class=\'dd-contentobject\'><video controls ' + poster + ' autoplay><source src=\'' + nodeAttr[_i] + '\' ' + videoType + '></video></dd>';
          } else {
            listEl.innerHTML += '<dd class=\'dd-contentobject\'><object data=\'' + nodeAttr[_i] + '\'></object></dd>';
          }
        } else {
          var valueHtml = nodeAttr[_i].replace(/\n/g, "<br>");
          listEl.innerHTML += '<dt class=\'dt-' + getDisplayAttr(attr) + '\' title=\'' + attr + '\'>' + getDisplayAttr(attr) + '</dt><dd class=\'dd-' + getDisplayAttr(attr) + '\'>' + valueHtml + '</dd>';
        }
      }
    }
    nodeDetailEl.appendChild(listEl);

    // let relTitleEl = document.createElement("h4");
    // relTitleEl.classList.add('linkTitle');
    // relTitleEl.innerHTML = "links";
    // nodeDetailEl.appendChild(relTitleEl);

    var relsEl = document.createElement("dl");
    // collect relationships
    for (var i = 0; i < graph.links.length; i++) {
      var _link = graph.links[i];
      if (_link['source']['@id'] == nodeDatum['@id']) {
        if (typeof relDown[_link['name']] == "undefined") {
          relDown[_link['name']] = [];
        }
        relDown[_link['name']][relDown[_link['name']].length] = _link['target'];
      }
      if (_link['target']['@id'] == nodeDatum['@id']) {
        if (typeof relUp[_link['name']] == "undefined") {
          relUp[_link['name']] = [];
        }
        relUp[_link['name']][relUp[_link['name']].length] = _link['source'];
      }
    }

    // relationships / links in <dl>
    for (var _attr in relDown) {
      var attrEl = document.createElement("dt");
      attrEl.innerHTML = getDisplayAttr(_attr);
      relsEl.appendChild(attrEl);
      for (var _i2 in relDown[_attr]) {
        var rel = relDown[_attr][_i2];
        relsEl.appendChild(createRelationshipEl(rel));
        if (typeof rel['https://schema.org/contentUrl'] != 'undefined') {
          var ddEl = document.createElement('dd');
          ddEl.classList.add('dd-contentobject');
          if (rel['@type'] == 'https://schema.org/VideoObject') {
            var _videoType = rel['https://schema.org/encodingFormat'] ? 'type=\'' + rel['https://schema.org/encodingFormat'] + '\'' : "";
            var _poster = rel['https://schema.org/thumbnailUrl'] ? 'poster=\'' + rel['https://schema.org/thumbnailUrl'] + '\'' : "";
            ddEl.innerHTML += '<video controls preload="none" ' + _poster + '><source src=\'' + rel['https://schema.org/contentUrl'] + '\' ' + _videoType + '></video>';
          } else {
            ddEl.innerHTML = '<object data=\'' + rel['https://schema.org/contentUrl'] + '\'></object>';
          }
          relsEl.appendChild(ddEl);
        }
      }
    }

    for (var _attr2 in relUp) {
      var _attrEl = document.createElement("dt");
      _attrEl.innerHTML = getDisplayAttr(_attr2);
      relsEl.appendChild(_attrEl);
      for (var _i3 in relUp[_attr2]) {
        var _rel = relUp[_attr2][_i3];
        relsEl.appendChild(createRelationshipEl(_rel, _i3));
        if (typeof _rel['https://schema.org/contentUrl'] != 'undefined') {
          var _ddEl = document.createElement('dd');
          _ddEl.classList.add('dd-contentobject');
          _ddEl.innerHTML = '<object data=\'' + _rel['https://schema.org/contentUrl'] + '\'></object>';
          relsEl.appendChild(_ddEl);
        }
      }
    }

    nodeDetailEl.appendChild(relsEl);

    node.each(function (d, nIdx, nodeEls) {
      if (nIdx == nodeIdx) {
        nodeEls[nIdx].classList.add('selectedNode');
      } else {
        nodeEls[nIdx].classList.remove('selectedNode');
      }
    });

    // TODO: update history & title
    document.title = pageTitles.join(" :: ");
  };
  var closeDetails = function closeDetails() {
    document.body.classList.remove("detailsOpen");
    scrollToY(0, 4000); // for mobile
  };

  /**
   * Select a node, and center it + show details
   * @param  int idx    The index of the node in the graph.nodes array
   * @param  Element|null nodeEl Optional, provide node element, so loop doesn't have to be used to change the Element
   * @return void
   */
  var selectNode = function selectNode(idx, updateHistory) {
    if (typeof updateHistory == 'undefined') {
      updateHistory = true;
    }

    var nodeEl = null;
    var nodeDatum = null;

    node.each(function (d, nIdx, nodeEls) {
      if (nIdx == idx) {
        nodeEl = nodeEls[idx];
        nodeDatum = d;
      }
    });
    if (!nodeEl) {
      return;
    }

    if (true) {
      // always set history state, but replace instead of update on 'updatehistory'
      var id = null;
      if (nodeDatum['@id'].startsWith( /*location.origin*/'https://rubenvandeven.com/')) {
        id = nodeDatum['@id'].substr(26);
      } else {
        id = '?id=' + nodeDatum['@id'];
      }

      if (updateHistory) {
        history.pushState({ node: idx }, getNodeLabel(nodeDatum), "/" + id);
      } else {
        history.replaceState({ node: idx }, getNodeLabel(nodeDatum), "/" + id);
      }
    }

    // set global var
    positionNodesInCenter(idx);

    var currentCrumbs = breadcrumbs[nodeDatum['@id']].slice();
    currentCrumbs[currentCrumbs.length] = nodeDatum['@id'];

    // set active links.
    var linkedIdxs = [];
    link.each(function (d, idx, linkEls, q) {
      // set nodes 'visible'/highlighted when linked to active node
      if (d.source == nodeDatum || d.target == nodeDatum) {
        linkEls[idx].classList.add('activeLink', 'visibleLink');
        linkEls[idx].getElementsByTagName("line")[0].setAttribute("marker-end", "url(#arrowHeadSelected)");
        node.filter(function (a, fnodeIdx) {
          var r = a['@id'] == d.source['@id'] || a['@id'] == d.target['@id']; //connected node: true/false
          if (r && linkedIdxs.indexOf(fnodeIdx) === -1) {
            linkedIdxs[linkedIdxs.length] = fnodeIdx;
          }
          return r;
        }).classed('visibleNode', true);
      } else {
        linkEls[idx].classList.remove('activeLink');
        linkEls[idx].getElementsByTagName("line")[0].setAttribute("marker-end", "url(#arrowHead)");
      }
      // check if link is part of breadcrumb trail
      var posSrc = currentCrumbs.indexOf(d.source['@id']);
      var posTrg = currentCrumbs.indexOf(d.target['@id']);
      if (posSrc > -1 && posTrg > -1 && Math.abs(posSrc - posTrg) == 1) {
        linkEls[idx].classList.add('breadcrumbLink');
        linkEls[idx].getElementsByTagName("line")[0].setAttribute("marker-end", "url(#arrowHeadCrumbTrail)");
      } else {
        linkEls[idx].classList.remove('breadcrumbLink');
      }
    });

    var i = linkedIdxs.indexOf(idx);

    if (i !== -1) {
      linkedIdxs.splice(i, 1);
    }

    positionNodesInCircle(linkedIdxs);

    setDetails(nodeDatum, idx);
  };
  var deselectNode = function deselectNode() {
    positionNodesInCenter(null);
    link.each(function (d, idx, linkEls, q) {
      linkEls[idx].classList.remove('activeLink');
      linkEls[idx].classList.remove('breadcrumbLink');
      linkEls[idx].getElementsByTagName("line")[0].setAttribute("marker-end", "url(#arrowHead)");
    });
    closeDetails();
  };

  window.addEventListener('popstate', function (event) {
    if (event.state.hasOwnProperty('node')) {
      selectNode(event.state['node'], false);
    } else {
      // if not sure what to do, fall back to first node (also used to return to opening page)
      var firstNode = graph['nodes'].find(function (n) {
        return n['@id'] === firstNodeId;
      });
      selectNode(graph['nodes'].indexOf(firstNode), false);
    }
  });

  var forceCx, forceCy;
  var setViewboxForceCenter = function setViewboxForceCenter() {
    var viewBox = getViewbox();
    var zoom = getZoomValues();
    forceCx = viewBox[0] + viewBox[2] / 2 - zoom['dx'];
    forceCy = viewBox[1] + viewBox[3] / 2 - zoom['dy'];
  };

  var getZoomValues = function getZoomValues() {
    var zoomContainer = document.getElementById("container");
    var dx = 0,
        dy = 0,
        scale = 1;
    if (zoomContainer.transform.baseVal.length > 0) {
      var _iteratorNormalCompletion5 = true;
      var _didIteratorError5 = false;
      var _iteratorError5 = undefined;

      try {
        for (var _iterator5 = zoomContainer.transform.baseVal[Symbol.iterator](), _step5; !(_iteratorNormalCompletion5 = (_step5 = _iterator5.next()).done); _iteratorNormalCompletion5 = true) {
          var transform = _step5.value;

          if (transform.type == SVGTransform.SVG_TRANSFORM_TRANSLATE) {
            dx += transform.matrix.e;
            dy += transform.matrix.f;
          } else if (transform.type == SVGTransform.SVG_TRANSFORM_SCALE) {
            scale *= transform.matrix.a; // assume simple scale
          }
        }
      } catch (err) {
        _didIteratorError5 = true;
        _iteratorError5 = err;
      } finally {
        try {
          if (!_iteratorNormalCompletion5 && _iterator5.return) {
            _iterator5.return();
          }
        } finally {
          if (_didIteratorError5) {
            throw _iteratorError5;
          }
        }
      }
    }

    return { 'dx': dx, 'dy': dy, 'scale': scale };
  };

  setViewboxForceCenter(); // sets forceCx & forceCy

  var graphInitialised = false;
  simulation.force('centerActive', function force(alpha) {
    // let currentNode = node.selectAll('.detail');
    // console.log(currentNode);
    // console.log(forceCx, forceCy);
    node.each(function (d, idx, nodes) {
      var n = d;
      var k = alpha * 0.1;
      n.fx = null;
      n.fy = null;
      if (typeof nodePositions[idx] != 'undefined') {
        if (graphInitialised == false) {
          n.x = nodePositions[idx][0];
          n.y = nodePositions[idx][1];
          n.vx = 0;
          n.vy = 0;
        } else {
          n.vx -= (n.x - nodePositions[idx][0]) * k * 5;
          n.vy -= (n.y - nodePositions[idx][1]) * k * 5;
        }
      } else {
        // if it's not positioned, move it out of the circle
        if (currentNodePositionRadius < 1) {
          return;
        }

        var dx = n.x - forceCx;
        var dy = n.y - forceCy;
        if (!inCircle(dx, dy, currentNodePositionRadius)) {
          return;
        }

        if (graphInitialised == false) {
          // on init, fixate items outside of circle
          n.fx = n.x + dx * (2 + Math.random());
          n.fy = n.y + dy * (2 + Math.random());
        } else {
          // if initialised, gradually move them outwards
          n.vx += dx * k * 4;
          n.vy += dy * k * 4;
        }
      }
    });
  });

  //path to curve the tile
  var nodePath = node.append("path").attr("id", function (d, idx) {
    return "nodePath" + idx;
  }).attr("d", function (d) {
    var r = getSizeForNode(d) * 0.9;
    var startX = getSizeForNode(d);
    // M cx cy
    // m -r, 0
    // a r,r 0 1,0 (r * 2),0
    // a r,r 0 1,0 -(r * 2),0
    // return 'M' + nodeSize/2 + ' ' + nodeSize/2 + ' ' +
    return 'M' + 0 + ' ' + 0 + ' ' + 'm -' + r + ', 0' + ' ' + 'a ' + r + ',' + r + ' 0 1,0 ' + r * 2 + ',0 ' + 'a ' + r + ',' + r + ' 0 1,0 -' + r * 2 + ',0';
    // return 'm' + startX + ',' + nodeSize + ' ' +
    // 'a' + r + ',' + r + ' 0 0 0 ' + (2*r) + ',0';
  });

  node.call(d3.drag().on("start", dragstarted).on("drag", dragged).on("end", dragended)).on("click", function (d, idx, nodes) {
    var node = nodes[idx];
    selectNode(idx, node, d);
  }).on('mouseover', function (n, nIdx) {
    link.each(function (l, idx, linkEls, q) {
      // set nodes 'visible'/highlighted when linked to active node
      if (l.source == n || l.target == n) {
        linkEls[idx].classList.add('hoverLink');
      }
    });
  }).on('mouseout', function () {
    var hoverLinkEls = document.getElementsByClassName('hoverLink');
    while (hoverLinkEls.length > 0) {
      hoverLinkEls[0].classList.remove('hoverLink');
    }
  });

  // svg.call(d3.drag()
  //         .on("start", function(d){
  //           if(d3.event.sourceEvent.type == 'touchstart' && d3.event.sourceEvent.touches.length > 1) {
  //           } else {
  //             d3.event.sourceEvent.stopPropagation();
  //             svg.node().classList.add("dragging");
  //           }
  //         })
  //         .on("drag", function(){
  //           moveViewboxPx(d3.event.dx, d3.event.dy);
  //         })
  //         .on("end", function(){
  //           svg.node().classList.remove("dragging");
  //         }));
  svg.call(d3.zoom().scaleExtent([0.3, 3]).on("start", function () {
    svg.node().classList.add("dragging");
  }).on("end", function () {
    svg.node().classList.remove("dragging");
  }).on("zoom", function (a, b, c) {
    container.attr("transform", d3.event.transform);
  }));

  // svg.call(d3.zoom.transform, d3.zoomIdentity);

  node.append('circle').attr("r", function (d) {
    return getSizeForNode(d);
  }).attr("class", "nodeBg");
  node.append('circle').attr("r", function (d) {
    return getSizeForNode(d) * 1.08;
  }) // nodeSize + margin
  .attr("class", "highlightCircle");

  node.append('text').attr("class", "nodeType").text(function (n) {
    return n['@type'];
  });

  node.append('text').attr("class", "nodeYear").attr("y", "22").text(function (n) {
    return getNodeYear(n);
  });
  var splitText = function splitText(text) {
    var characters = [" ", "-", '\xAD'];
    var charSplitPos = {};
    var mid = Math.floor(text.length / 2);
    var splitPos = false;
    var splitPosChar = false;
    // split sentences
    var _iteratorNormalCompletion6 = true;
    var _didIteratorError6 = false;
    var _iteratorError6 = undefined;

    try {
      for (var _iterator6 = characters[Symbol.iterator](), _step6; !(_iteratorNormalCompletion6 = (_step6 = _iterator6.next()).done); _iteratorNormalCompletion6 = true) {
        var char = _step6.value;

        if (text.indexOf(char) < 0) {
          continue;
        }
        var tmid = text.substr(0, mid).lastIndexOf(char);
        if (tmid === -1) {
          tmid = text.indexOf(char);
        }
        tmid += 1; // we want to cut _after_ the character
        // console.log("Char", char, tmid);
        if (splitPos === false || Math.abs(tmid - mid) < Math.abs(splitPos - mid)) {
          // console.log("least!");
          splitPos = tmid;
          splitPosChar = char;
        }
      }
      // console.log("pos",splitPos)

    } catch (err) {
      _didIteratorError6 = true;
      _iteratorError6 = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion6 && _iterator6.return) {
          _iterator6.return();
        }
      } finally {
        if (_didIteratorError6) {
          throw _iteratorError6;
        }
      }
    }

    if (splitPos === false) {
      return false;
    }

    var text1 = text.substr(0, splitPos).trim();
    var text2 = text.substr(splitPos).trim();

    if (splitPosChar == '\xAD') {
      text1 += "-";
    }

    // find most equal split
    return [text1, text2];
  };
  var nodeTitle = node.append('text').attr("class", "nodeTitle").attr("y", "5");
  nodeTitle
  // .append("textPath")
  // .attr( "xlink:href",function(d, idx){return '#nodePath'+idx;})
  // .text(getNodeLabel)
  .each(function (node, nodes) {
    var textLength = void 0;
    var self = d3.select(this);
    var titleText = getNodeLabel(node);
    var titleTexts = false;
    if (titleText.length > 20) {
      titleTexts = splitText(titleText);
    }
    if (titleTexts !== false) {
      var tspan1 = self.append("tspan").text(titleTexts[0]).attr("y", "-10").attr("x", "0");
      var tspan = self.append("tspan").text(titleTexts[1]).attr("y", "10").attr("x", "0");
      var textLength1 = tspan.node().getComputedTextLength();
      var textLength2 = tspan.node().getComputedTextLength();
      textLength = Math.max(textLength1, textLength2);
    } else {
      self.text(titleText);
      textLength = self.node().getComputedTextLength();
    }

    // scale according to text length:
    if (textLength > getSizeForNode(node) * 2) {
      self.attr('transform', 'scale(' + getSizeForNode(node) * 2 / textLength / 1.05 + ')');
    }
  });

  node.each(function (d) {
    if (!d['https://schema.org/thumbnailUrl']) {
      return;
    }
    d3.select(this).append('svg:image').attr("xlink:href", d['https://schema.org/thumbnailUrl']).attr("width", function (d) {
      return getSizeForNode(d) * 2;
    }).attr("height", function (d) {
      return getSizeForNode(d) * 2;
    }).attr("transform", function (d) {
      return "translate(-" + getSizeForNode(d) + " -" + getSizeForNode(d) + ")";
    }).attr("clip-path", "url(#clipNodeImage)").attr("preserveAspectRatio", "xMidYMid slice");
  });

  simulation.nodes(graph.nodes).on("tick", ticked);

  simulation.force("link").links(graph.links).distance(function (l) {
    switch (l.name) {
      // case 'publishedAt':
      //   return 200;
      // case 'image':
      //   return 200;
      default:
        return 300;
    }
  }) // distance between the nodes / link length
  // .charge(-100)
  ;

  // run on each draw
  function ticked() {
    graph.nodes.forEach(function (d, idx) {
      d.leftX = d.rightX = d.x;

      // fix first node on center
      //             if(idx === 0) {
      //               d.fx = width/2;
      //               d.fy = height/2;
      //               return;
      // }
    });

    linkLine.each(function (d) {
      var sourceX, targetX, midX, dx, dy, angle;

      // This mess makes the arrows exactly perfect.
      // thanks to http://bl.ocks.org/curran/9b73eb564c1c8a3d8f3ab207de364bf4
      if (d.source.rightX < d.target.leftX) {
        sourceX = d.source.rightX;
        targetX = d.target.leftX;
      } else if (d.target.rightX < d.source.leftX) {
        targetX = d.target.rightX;
        sourceX = d.source.leftX;
      } else if (d.target.isCircle) {
        targetX = sourceX = d.target.x;
      } else if (d.source.isCircle) {
        targetX = sourceX = d.source.x;
      } else {
        midX = (d.source.x + d.target.x) / 2;
        if (midX > d.target.rightX) {
          midX = d.target.rightX;
        } else if (midX > d.source.rightX) {
          midX = d.source.rightX;
        } else if (midX < d.target.leftX) {
          midX = d.target.leftX;
        } else if (midX < d.source.leftX) {
          midX = d.source.leftX;
        }
        targetX = sourceX = midX;
      }

      dx = targetX - sourceX;
      dy = d.target.y - d.source.y;
      angle = Math.atan2(dx, dy);

      /* DISABLED
      srcSize = (typeof nodePositions[d.source.index] != 'undefined') ? selectedNodeSize : nodeSize;
      tgtSize = (typeof nodePositions[d.target.index] != 'undefined') ? selectedNodeSize : nodeSize;
      */
      var srcSize = getSizeForNode(d.source) + 3.2;
      var tgtSize = getSizeForNode(d.target) + 3.2;

      // Compute the line endpoint such that the arrow
      // is touching the edge of the node rectangle perfectly.
      d.sourceX = sourceX + Math.sin(angle) * srcSize;
      d.targetX = targetX - Math.sin(angle) * tgtSize;
      d.sourceY = d.source.y + Math.cos(angle) * srcSize;
      d.targetY = d.target.y - Math.cos(angle) * tgtSize;
    }).attr("x1", function (d) {
      return d.sourceX;
    }).attr("y1", function (d) {
      return d.sourceY;
    }).attr("x2", function (d) {
      return d.targetX;
    }).attr("y2", function (d) {
      return d.targetY;
    });
    linkText.attr("transform", function (d) {
      var dx = (d.target.x - d.source.x) / 2;
      var dy = (d.target.y - d.source.y) / 2;
      var x = d.source.x + dx;
      var y = d.source.y + dy;
      var deg = Math.atan(dy / dx) * 180 / Math.PI;
      // if dx/dy == 0/0 -> deg == NaN
      if (isNaN(deg)) {
        return "";
      }
      return "translate(" + x + " " + y + ") rotate(" + deg + ") translate(0, -10)";
    });

    node.attr("transform", function (d) {
      return "translate(" + d.x + "," + d.y + ")";
    });
  }

  function dragstarted(d, idx, nodes) {
    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
    var nodeEl = nodes[idx];
    d.fx = d.x;
    d.fy = d.y;
    // nodeEl.style.fill = '#00f';
    nodeEl.classList.add('drag');
  }

  // use to validate drag
  // function validate(x, a, b) {
  //     if (x =< a) return a;
  //     return b;
  // }

  function dragged(d, idx) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  function dragended(d, idx, nodes) {
    if (!d3.event.active) simulation.alphaTarget(0);
    var nodeEl = nodes[idx];
    d.fx = null;
    d.fy = null;
    nodeEl.classList.remove('drag');
  }

  function moveViewboxPx(dx, dy) {
    var viewBox = svg.attr("viewBox").split(" ").map(parseFloat);
    viewBox[0] -= dx * 1;
    viewBox[1] -= dy * 1;
    svg.attr("viewBox", viewBox.join(" "));
  }

  // start by selecting the first node :-)
  // selectNode(currentNodeIdx+1);
  // positionNodesInCenter(currentNodeIdx);

  if (location.pathname.startsWith('/@type/')) {
    for (var t in types) {
      if (getDisplayAttr(t) == location.pathname.substr(7)) {
        centerByType(t, false);
      }
    }
  } else {
    var startNodeId = location.search.startsWith("?id=") ? location.search.substr(4) : 'https://rubenvandeven.com' + location.pathname;
    var firstNode = graph['nodes'].find(function (n) {
      return n['@id'] === startNodeId;
    });
    selectNode(graph['nodes'].indexOf(firstNode), false);
  }

  // closeDetails(); // hide details at first
  // positionNodesInCenter(currentNodeIdx+1);

  // setTimeout(function(){
  // document.body.classList.add('graphInitialised');
  // }, 10);

  var initPlaceholder = document.getElementById('initPlaceholder');
  svg.node().removeChild(initPlaceholder);
  setTimeout(function () {
    graphInitialised = true;
    document.body.classList.add('graphInitialised');
  }, 500);
}

// Detect request animation frame
var reqAnimFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame ||
// IE Fallback, you can even fallback to onscroll
function (callback) {
  window.setTimeout(callback, 1000 / 60);
};
// all credits go to https://stackoverflow.com/a/26798337
function scrollToY(scrollTargetY, speed, easing, finishFunction) {
  // scrollTargetY: the target scrollY property of the window
  // speed: time in pixels per second
  // easing: easing equation to use

  var scrollY = window.scrollY,
      scrollTargetY = scrollTargetY || 0,
      speed = speed || 2000,
      easing = easing || 'easeOutSine',
      currentTime = 0,
      finishFunction = finishFunction || false;

  // min time .1, max time .8 seconds
  var time = Math.max(.1, Math.min(Math.abs(scrollY - scrollTargetY) / speed, .8));

  // easing equations from https://github.com/danro/easing-js/blob/master/easing.js
  var PI_D2 = Math.PI / 2,
      easingEquations = {
    easeOutSine: function easeOutSine(pos) {
      return Math.sin(pos * (Math.PI / 2));
    },
    easeInOutSine: function easeInOutSine(pos) {
      return -0.5 * (Math.cos(Math.PI * pos) - 1);
    },
    easeInOutQuint: function easeInOutQuint(pos) {
      if ((pos /= 0.5) < 1) {
        return 0.5 * Math.pow(pos, 5);
      }
      return 0.5 * (Math.pow(pos - 2, 5) + 2);
    }
  };

  // add animation loop
  function tick() {
    currentTime += 1 / 60;

    var p = currentTime / time;
    var t = easingEquations[easing](p);

    if (p < 1) {
      reqAnimFrame(tick);

      window.scrollTo(0, scrollY + (scrollTargetY - scrollY) * t);
    } else {
      window.scrollTo(0, scrollTargetY);
      if (finishFunction) {
        finishFunction();
      }
    }
  }

  // call it once to get started
  tick();
}