const CONFIG = {
    'nodeSize': 16,
    'baseUrl': 'https://www.securityvision.io/wiki/index.php/',
    'dataUrl': 'semantic_data.json',
    'labels': {
        'rotate': true,
    },
};


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);
    if (node.parent) {
        return 2;
    }
    return CONFIG.nodeSize;
}

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];
};

function getTitle(obj) {
    if(obj.parent) {
        return "sub of " + obj.parent.split('#', 1)[0].replace(/_/g, " ")
    }
    return obj['@id'].split('#', 1)[0].replace(/_/g, " ")
}
function getClasses(obj) {
    if (!obj._INST)
        return 'node';
    const classes = obj['_INST'].map(classId => classId.split('#', 1)[0]);
    return 'node ' + classes.join(' ');
}
function getUrl(obj) {
    return CONFIG.baseUrl + obj['@id'].split('#', 1)[0];
}

let width = window.innerWidth;
let height = window.innerHeight;

const request = new Request(CONFIG.dataUrl, { method: 'GET' });
fetch(request)
    .then(response => {
        if (response.status === 200) {
            return response.json();
        } else {
            throw new Error('Something went wrong on api server!');
        }
    })
    .then(data => {
        buildGraph(data);
    }).catch(error => {
        console.error(error);
    });

function buildGraph(data) {
    console.log(data);
    const nodes = data.nodes.filter(n => n._INST || n.parent).map(d => Object.create(d));
    const nodeMap = Object.fromEntries(nodes.map(d => [d['@id'], d]));
    const links = data.links.filter(l => nodeMap[l.source] && nodeMap[l.target]).map(d => Object.create(d));

    const simulation = d3.forceSimulation(nodes)
        .force("link", d3.forceLink(links)
            .id(d => d['@id'])
            .iterations(2) // increase to make more rigid
        )
        .force("charge", d3.forceManyBody()
            .strength(-50)
        )
        .force("center", d3.forceCenter(width / 2, height / 2))
        .force("collision", d3.forceCollide(function (d) {
          return getSizeForNode(d) * 1.5; // avoid overlapping nodes
        }));

    const svg = d3.select("svg")
        .attr("viewBox", [0, 0, width, height]);
    const container = svg.append("g").attr("id", "container");

    const link = container.append("g")
        .attr('class', 'links')
        .selectAll(".link")
        .data(links)
        .join("g")
        .attr("class", "link")

    const linkLine = link
        .append("line").
        attr("marker-end", "url(#arrowHead)");
    const linkText = link.append("text").text(function (l) {
      return l.name;
    });

    const node = container.append("g")
        .attr('class', 'nodes')
        .selectAll(".node")
        .data(nodes)
        .join("g")
        .attr('class', getClasses)
        .call(drag(simulation))
        .on("click", (evt, n) => selectNode(evt, n, node))
        ;

    node
        .append('circle')
        .attr("r", getSizeForNode)
    // .call(drag(simulation));

    var nodeTitle = node.append('text').attr("class", "nodeTitle").attr("y", "5");
    nodeTitle
        .each(function (node, nodes) {
            var textLength = void 0;
            const self = d3.select(this);
            const titleText = getTitle(node);
            var titleTexts = false;
            if (titleText.length > 20) {
                titleTexts = splitText(titleText);
            }
            if (titleTexts !== false) {
                const tspan1 = self.append("tspan").text(titleTexts[0]).attr("y", "-10").attr("x", "0");
                const tspan = self.append("tspan").text(titleTexts[1]).attr("y", "10").attr("x", "0");
                const textLength1 = tspan.node().getComputedTextLength();
                const 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.append("title")
    //     .text(d => d['@id']);

    svg.call(d3.zoom().scaleExtent([0.3, 6]).on("start", function () {
        svg.node().classList.add("dragging");
    }).on("end", function () {
        svg.node().classList.remove("dragging");
    }).on("zoom", function ({ transform }) {
        container.attr("transform", transform);
    }));


    simulation.on("tick", () => {


        data.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;
          // }
        });
        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);

        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.x < d.target.x) {
            sourceX = d.source.x;
            targetX = d.target.x;
          } else if (d.target.x < d.source.x) {
            targetX = d.target.x;
            sourceX = d.source.x;
          } 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.x) {
              midX = d.target.x;
            } else if (midX > d.source.x) {
              midX = d.source.x;
            } else if (midX < d.target.x) {
              midX = d.target.x;
            } else if (midX < d.source.x) {
              midX = d.source.x;
            }
            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);
          var tgtSize = getSizeForNode(d.target);

          // 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) {
          const dx = (d.target.x - d.source.x) / 2;
          const dy = (d.target.y - d.source.y) / 2;
          const x = d.source.x + dx;
          const y = d.source.y + dy;
          const deg = Math.atan(dy / dx) * 180 / Math.PI;
          // if dx/dy == 0/0 -> deg == NaN
          if (isNaN(deg)) {
            return "";
          }
        // return "";
          return "translate(" + x + " " + y + ") rotate(" + (CONFIG.labels.rotate ? deg : 0) + ")";
        });

        node
            .attr("transform", d => `translate(${d.x}, ${d.y})`);
    });


    return svg.node();
}

color = _ => {
    const scale = d3.scaleOrdinal(d3.schemeCategory10);
    return d => scale(d.group);
};

const drag = simulation => {

    function dragstarted(event) {
        if (!event.active) simulation.alphaTarget(0.3).restart();
        event.subject.fx = event.subject.x;
        event.subject.fy = event.subject.y;
    }

    function dragged(event) {
        event.subject.fx = event.x;
        event.subject.fy = event.y;
    }

    function dragended(event) {
        if (!event.active) simulation.alphaTarget(0);
        event.subject.fx = null;
        event.subject.fy = null;
    }

    return d3.drag()
        .on("start", dragstarted)
        .on("drag", dragged)
        .on("end", dragended);
};

function selectNode(evt, node, d3Node){
    console.log(evt, node, d3Node);
    document.querySelectorAll('svg .node').forEach(n => n.classList.remove('selected'));
    d3Node._groups[0][node.index].classList.add('selected');

    infoEl = document.getElementById('nodeInfo');
    infoEl.classList.remove('hidden');

    const url = getUrl(node);
    const hrefEl = infoEl.querySelector('.nodeHref');
    hrefEl.textContent = getTitle(node);
    hrefEl.setAttribute('href',url);
    infoEl.querySelector('.nodeContents').src = url;
    
}

document.getElementById('closeInfo').addEventListener('click', (evt) => {
    document.querySelectorAll('svg .node').forEach(n => n.classList.remove('selected'));
    document.getElementById('nodeInfo').classList.add('hidden');
})