text: /* eslint-disable unicorn/no-fn-reference-in-iterator */
  /**
   * ext-connector.js
   *
   * @license MIT
   *
   * @copyright 2010 Alexis Deveria
   *
   */
  
  export default {
    name: 'connector',
    async init (S) {
      const svgEditor = this;
      const svgCanvas = svgEditor.canvas;
      const {getElem} = svgCanvas;
      const {$, svgroot, importLocale} = S,
        addElem = svgCanvas.addSVGElementFromJson,
        selManager = S.selectorManager,
        connSel = '.se_connector',
        // connect_str = '-SE_CONNECT-',
        elData = $.data;
      const strings = await importLocale();
  
      let startX,
        startY,
        curLine,
        startElem,
        endElem,
        seNs,
        {svgcontent} = S,
        started = false,
        connections = [],
        selElems = [];
  
      /**
       *
       * @param {Float} x
       * @param {Float} y
       * @param {module:utilities.BBoxObject} bb
       * @param {Float} offset
       * @returns {module:math.XYObject}
       */
      function getBBintersect (x, y, bb, offset) {
        if (offset) {
          offset -= 0;
          bb = $.extend({}, bb);
          bb.width += offset;
          bb.height += offset;
          bb.x -= offset / 2;
          bb.y -= offset / 2;
        }
  
        const midX = bb.x + bb.width / 2;
        const midY = bb.y + bb.height / 2;
        const lenX = x - midX;
        const lenY = y - midY;
  
        const slope = Math.abs(lenY / lenX);
  
        let ratio;
        if (slope < bb.height / bb.width) {
          ratio = (bb.width / 2) / Math.abs(lenX);
        } else {
          ratio = lenY
            ? (bb.height / 2) / Math.abs(lenY)
            : 0;
        }
  
        return {
          x: midX + lenX * ratio,
          y: midY + lenY * ratio
        };
      }
  
      /**
      * @param {"start"|"end"} side
      * @param {Element} line
      * @returns {Float}
      */
      function getOffset (side, line) {
        const giveOffset = line.getAttribute('marker-' + side);
        // const giveOffset = $(line).data(side+'_off');
  
        // TODO: Make this number (5) be based on marker width/height
        const size = line.getAttribute('stroke-width') * 5;
        return giveOffset ? size : 0;
      }
  
      /**
      * @param {boolean} on
      * @returns {void}
      */
      function showPanel (on) {
        let connRules = $('#connector_rules');
        if (!connRules.length) {
          connRules = $('<style id="connector_rules"></style>').appendTo('head');
        }
        connRules.text(!on ? '' : '#tool_clone, #tool_topath, #tool_angle, #xy_panel { display: none !important; }');
        $('#connector_panel').toggle(on);
      }
  
      /**
       * @param {Element} elem
       * @param {Integer|"end"} pos
       * @param {Float} x
       * @param {Float} y
       * @param {boolean} [setMid]
       * @returns {void}
      */
      function setPoint (elem, pos, x, y, setMid) {
        const pts = elem.points;
        const pt = svgroot.createSVGPoint();
        pt.x = x;
        pt.y = y;
        if (pos === 'end') { pos = pts.numberOfItems - 1; }
        // TODO: Test for this on init, then use alt only if needed
        try {
          pts.replaceItem(pt, pos);
        } catch (err) {
          // Should only occur in FF which formats points attr as "n,n n,n", so just split
          const ptArr = elem.getAttribute('points').split(' ');
          for (let i = 0; i < ptArr.length; i++) {
            if (i === pos) {
              ptArr[i] = x + ',' + y;
            }
          }
          elem.setAttribute('points', ptArr.join(' '));
        }
  
        if (setMid) {
          // Add center point
          const ptStart = pts.getItem(0);
          const ptEnd = pts.getItem(pts.numberOfItems - 1);
          setPoint(elem, 1, (ptEnd.x + ptStart.x) / 2, (ptEnd.y + ptStart.y) / 2);
        }
      }
  
      /**
      * @param {Float} diffX
      * @param {Float} diffY
      * @returns {void}
      */
      function updateLine (diffX, diffY) {
        // Update line with element
        let i = connections.length;
        while (i--) {
          const conn = connections[i];
          const line = conn.connector;
          // const {elem} = conn;
  
          const pre = conn.is_start ? 'start' : 'end';
          // const sw = line.getAttribute('stroke-width') * 5;
  
          // Update bbox for this element
          const bb = elData(line, pre + '_bb');
          bb.x = conn.start_x + diffX;
          bb.y = conn.start_y + diffY;
          elData(line, pre + '_bb', bb);
  
          const altPre = conn.is_start ? 'end' : 'start';
  
          // Get center pt of connected element
          const bb2 = elData(line, altPre + '_bb');
          const srcX = bb2.x + bb2.width / 2;
          const srcY = bb2.y + bb2.height / 2;
  
          // Set point of element being moved
          const pt = getBBintersect(srcX, srcY, bb, getOffset(pre, line)); // $(line).data(pre+'_off')?sw:0
          setPoint(line, conn.is_start ? 0 : 'end', pt.x, pt.y, true);
  
          // Set point of connected element
          const pt2 = getBBintersect(pt.x, pt.y, elData(line, altPre + '_bb'), getOffset(altPre, line));
          setPoint(line, conn.is_start ? 'end' : 0, pt2.x, pt2.y, true);
        }
      }
  
      /**
      *
      * @param {Element[]} [elems=selElems] Array of elements
      * @returns {void}
      */
      function findConnectors (elems = selElems) {
        const connectors = $(svgcontent).find(connSel);
        connections = [];
  
        // Loop through connectors to see if one is connected to the element
        connectors.each(function () {
          let addThis;
          /**
          *
          * @returns {void}
          */
          function add () {
            if (elems.includes(this)) {
              // Pretend this element is selected
              addThis = true;
            }
          }
  
          // Grab the ends
          const parts = [];
          ['start', 'end'].forEach(function (pos, i) {
            const key = 'c_' + pos;
            let part = elData(this, key);
            if (part === null || part === undefined) { // Does this ever return nullish values?
              part = document.getElementById(
                this.attributes['se:connector'].value.split(' ')[i]
              );
              elData(this, 'c_' + pos, part.id);
              elData(this, pos + '_bb', svgCanvas.getStrokedBBox([part]));
            } else part = document.getElementById(part);
            parts.push(part);
          }, this);
  
          for (let i = 0; i < 2; i++) {
            const cElem = parts[i];
  
            addThis = false;
            // The connected element might be part of a selected group
            $(cElem).parents().each(add);
  
            if (!cElem || !cElem.parentNode) {
              $(this).remove();
              continue;
            }
            if (elems.includes(cElem) || addThis) {
              const bb = svgCanvas.getStrokedBBox([cElem]);
              connections.push({
                elem: cElem,
                connector: this,
                is_start: (i === 0),
                start_x: bb.x,
                start_y: bb.y
              });
            }
          }
        });
      }
  
      /**
      * @param {Element[]} [elems=selElems]
      * @returns {void}
      */
      function updateConnectors (elems) {
        // Updates connector lines based on selected elements
        // Is not used on mousemove, as it runs getStrokedBBox every time,
        // which isn't necessary there.
        findConnectors(elems);
        if (connections.length) {
          // Update line with element
          let i = connections.length;
          while (i--) {
            const conn = connections[i];
            const line = conn.connector;
            const {elem} = conn;
  
            // const sw = line.getAttribute('stroke-width') * 5;
            const pre = conn.is_start ? 'start' : 'end';
  
            // Update bbox for this element
            const bb = svgCanvas.getStrokedBBox([elem]);
            bb.x = conn.start_x;
            bb.y = conn.start_y;
            elData(line, pre + '_bb', bb);
            /* const addOffset = */ elData(line, pre + '_off');
  
            const altPre = conn.is_start ? 'end' : 'start';
  
            // Get center pt of connected element
            const bb2 = elData(line, altPre + '_bb');
            const srcX = bb2.x + bb2.width / 2;
            const srcY = bb2.y + bb2.height / 2;
  
            // Set point of element being moved
            let pt = getBBintersect(srcX, srcY, bb, getOffset(pre, line));
            setPoint(line, conn.is_start ? 0 : 'end', pt.x, pt.y, true);
  
            // Set point of connected element
            const pt2 = getBBintersect(pt.x, pt.y, elData(line, altPre + '_bb'), getOffset(altPre, line));
            setPoint(line, conn.is_start ? 'end' : 0, pt2.x, pt2.y, true);
  
            // Update points attribute manually for webkit
            if (navigator.userAgent.includes('AppleWebKit')) {
              const pts = line.points;
              const len = pts.numberOfItems;
              const ptArr = [];
              for (let j = 0; j < len; j++) {
                pt = pts.getItem(j);
                ptArr[j] = pt.x + ',' + pt.y;
              }
              line.setAttribute('points', ptArr.join(' '));
            }
          }
        }
      }
  
      // Do once
      (function () {
        const gse = svgCanvas.groupSelectedElements;
  
        svgCanvas.groupSelectedElements = function (...args) {
          svgCanvas.removeFromSelection($(connSel).toArray());
          return gse.apply(this, args);
        };
  
        const mse = svgCanvas.moveSelectedElements;
  
        svgCanvas.moveSelectedElements = function (...args) {
          const cmd = mse.apply(this, args);
          updateConnectors();
          return cmd;
        };
  
        seNs = svgCanvas.getEditorNS();
      }());
  
      /**
      * Do on reset.
      * @returns {void}
      */
      function init () {
        // Make sure all connectors have data set
        $(svgcontent).find('*').each(function () {
          const conn = this.getAttributeNS(seNs, 'connector');
          if (conn) {
            this.setAttribute('class', connSel.substr(1));
            const connData = conn.split(' ');
            const sbb = svgCanvas.getStrokedBBox([getElem(connData[0])]);
            const ebb = svgCanvas.getStrokedBBox([getElem(connData[1])]);
            $(this).data('c_start', connData[0])
              .data('c_end', connData[1])
              .data('start_bb', sbb)
              .data('end_bb', ebb);
            svgCanvas.getEditorNS(true);
          }
        });
        // updateConnectors();
      }
  
      // $(svgroot).parent().mousemove(function (e) {
      // // if (started
      // //   || svgCanvas.getMode() !== 'connector'
      // //  || e.target.parentNode.parentNode !== svgcontent) return;
      //
      // console.log('y')
      // // if (e.target.parentNode.parentNode === svgcontent) {
      // //
      // // }
      // });
  
      const buttons = [{
        id: 'mode_connect',
        type: 'mode',
        icon: svgEditor.curConfig.imgPath + 'cut.png',
        includeWith: {
          button: '#tool_line',
          isDefault: false,
          position: 1
        },
        events: {
          click () {
            svgCanvas.setMode('connector');
          }
        }
      }];
  
      return {
        name: strings.name,
        svgicons: svgEditor.curConfig.imgPath + 'conn.svg',
        buttons: strings.buttons.map((button, i) => {
          return Object.assign(buttons[i], button);
        }),
        /* async */ addLangData ({lang}) { // , importLocale: importLoc
          return {
            data: strings.langList
          };
        },
        mouseDown (opts) {
          const e = opts.event;
          startX = opts.start_x;
          startY = opts.start_y;
          const mode = svgCanvas.getMode();
          const {curConfig: {initStroke}} = svgEditor;
  
          if (mode === 'connector') {
            if (started) { return undefined; }
  
            const mouseTarget = e.target;
  
            const parents = $(mouseTarget).parents();
  
            if ($.inArray(svgcontent, parents) !== -1) {
              // Connectable element
  
              // If child of foreignObject, use parent
              const fo = $(mouseTarget).closest('foreignObject');
              startElem = fo.length ? fo[0] : mouseTarget;
  
              // Get center of source element
              const bb = svgCanvas.getStrokedBBox([startElem]);
              const x = bb.x + bb.width / 2;
              const y = bb.y + bb.height / 2;
  
              started = true;
              curLine = addElem({
                element: 'polyline',
                attr: {
                  id: svgCanvas.getNextId(),
                  points: (x + ',' + y + ' ' + x + ',' + y + ' ' + startX + ',' + startY),
                  stroke: '#' + initStroke.color,
                  'stroke-width': (!startElem.stroke_width || startElem.stroke_width === 0)
                    ? initStroke.width
                    : startElem.stroke_width,
                  fill: 'none',
                  opacity: initStroke.opacity,
                  style: 'pointer-events:none'
                }
              });
              elData(curLine, 'start_bb', bb);
            }
            return {
              started: true
            };
          }
          if (mode === 'select') {
            findConnectors();
          }
          return undefined;
        },
        mouseMove (opts) {
          const zoom = svgCanvas.getZoom();
          // const e = opts.event;
          const x = opts.mouse_x / zoom;
          const y = opts.mouse_y / zoom;
  
          const diffX = x - startX,
            diffY = y - startY;
  
          const mode = svgCanvas.getMode();
  
          if (mode === 'connector' && started) {
            // const sw = curLine.getAttribute('stroke-width') * 3;
            // Set start point (adjusts based on bb)
            const pt = getBBintersect(x, y, elData(curLine, 'start_bb'), getOffset('start', curLine));
            startX = pt.x;
            startY = pt.y;
  
            setPoint(curLine, 0, pt.x, pt.y, true);
  
            // Set end point
            setPoint(curLine, 'end', x, y, true);
          } else if (mode === 'select') {
            let slen = selElems.length;
            while (slen--) {
              const elem = selElems[slen];
              // Look for selected connector elements
              if (elem && elData(elem, 'c_start')) {
                // Remove the "translate" transform given to move
                svgCanvas.removeFromSelection([elem]);
                svgCanvas.getTransformList(elem).clear();
              }
            }
            if (connections.length) {
              updateLine(diffX, diffY);
            }
          }
        },
        mouseUp (opts) {
          // const zoom = svgCanvas.getZoom();
          const e = opts.event;
          // , x = opts.mouse_x / zoom,
          // , y = opts.mouse_y / zoom,
          let mouseTarget = e.target;
  
          if (svgCanvas.getMode() !== 'connector') {
            return undefined;
          }
          const fo = $(mouseTarget).closest('foreignObject');
          if (fo.length) { mouseTarget = fo[0]; }
  
          const parents = $(mouseTarget).parents();
  
          if (mouseTarget === startElem) {
            // Start line through click
            started = true;
            return {
              keep: true,
              element: null,
              started
            };
          }
          if ($.inArray(svgcontent, parents) === -1) {
            // Not a valid target element, so remove line
            $(curLine).remove();
            started = false;
            return {
              keep: false,
              element: null,
              started
            };
          }
          // Valid end element
          endElem = mouseTarget;
  
          const startId = startElem.id, endId = endElem.id;
          const connStr = startId + ' ' + endId;
          const altStr = endId + ' ' + startId;
          // Don't create connector if one already exists
          const dupe = $(svgcontent).find(connSel).filter(function () {
            const conn = this.getAttributeNS(seNs, 'connector');
            if (conn === connStr || conn === altStr) { return true; }
            return false;
          });
          if (dupe.length) {
            $(curLine).remove();
            return {
              keep: false,
              element: null,
              started: false
            };
          }
  
          const bb = svgCanvas.getStrokedBBox([endElem]);
  
          const pt = getBBintersect(startX, startY, bb, getOffset('start', curLine));
          setPoint(curLine, 'end', pt.x, pt.y, true);
          $(curLine)
            .data('c_start', startId)
            .data('c_end', endId)
            .data('end_bb', bb);
          seNs = svgCanvas.getEditorNS(true);
          curLine.setAttributeNS(seNs, 'se:connector', connStr);
          curLine.setAttribute('class', connSel.substr(1));
          curLine.setAttribute('opacity', 1);
          svgCanvas.addToSelection([curLine]);
          svgCanvas.moveToBottomSelectedElement();
          selManager.requestSelector(curLine).showGrips(false);
          started = false;
          return {
            keep: true,
            element: curLine,
            started
          };
        },
        selectedChanged (opts) {
          // TODO: Find better way to skip operations if no connectors are in use
          if (!$(svgcontent).find(connSel).length) { return; }
  
          if (svgCanvas.getMode() === 'connector') {
            svgCanvas.setMode('select');
          }
  
          // Use this to update the current selected elements
          selElems = opts.elems;
  
          let i = selElems.length;
          while (i--) {
            const elem = selElems[i];
            if (elem && elData(elem, 'c_start')) {
              selManager.requestSelector(elem).showGrips(false);
              if (opts.selectedElement && !opts.multiselected) {
                // TODO: Set up context tools and hide most regular line tools
                showPanel(true);
              } else {
                showPanel(false);
              }
            } else {
              showPanel(false);
            }
          }
          updateConnectors();
        },
        elementChanged (opts) {
          let elem = opts.elems[0];
          if (elem && elem.tagName === 'svg' && elem.id === 'svgcontent') {
            // Update svgcontent (can change on import)
            svgcontent = elem;
            init();
          }
  
          // Has marker, so change offset
          if (elem && (
            elem.getAttribute('marker-start') ||
            elem.getAttribute('marker-mid') ||
            elem.getAttribute('marker-end')
          )) {
            const start = elem.getAttribute('marker-start');
            const mid = elem.getAttribute('marker-mid');
            const end = elem.getAttribute('marker-end');
            curLine = elem;
            $(elem)
              .data('start_off', Boolean(start))
              .data('end_off', Boolean(end));
  
            if (elem.tagName === 'line' && mid) {
              // Convert to polyline to accept mid-arrow
  
              const x1 = Number(elem.getAttribute('x1'));
              const x2 = Number(elem.getAttribute('x2'));
              const y1 = Number(elem.getAttribute('y1'));
              const y2 = Number(elem.getAttribute('y2'));
              const {id} = elem;
  
              const midPt = (' ' + ((x1 + x2) / 2) + ',' + ((y1 + y2) / 2) + ' ');
              const pline = addElem({
                element: 'polyline',
                attr: {
                  points: (x1 + ',' + y1 + midPt + x2 + ',' + y2),
                  stroke: elem.getAttribute('stroke'),
                  'stroke-width': elem.getAttribute('stroke-width'),
                  'marker-mid': mid,
                  fill: 'none',
                  opacity: elem.getAttribute('opacity') || 1
                }
              });
              $(elem).after(pline).remove();
              svgCanvas.clearSelection();
              pline.id = id;
              svgCanvas.addToSelection([pline]);
              elem = pline;
            }
          }
          // Update line if it's a connector
          if (elem.getAttribute('class') === connSel.substr(1)) {
            const start = getElem(elData(elem, 'c_start'));
            updateConnectors([start]);
          } else {
            updateConnectors();
          }
        },
        IDsUpdated (input) {
          const remove = [];
          input.elems.forEach(function (elem) {
            if ('se:connector' in elem.attr) {
              elem.attr['se:connector'] = elem.attr['se:connector'].split(' ')
                .map(function (oldID) { return input.changes[oldID]; }).join(' ');
  
              // Check validity - the field would be something like 'svg_21 svg_22', but
              // if one end is missing, it would be 'svg_21' and therefore fail this test
              if (!(/. ./).test(elem.attr['se:connector'])) {
                remove.push(elem.attr.id);
              }
            }
          });
          return {remove};
        },
        toolButtonStateUpdate (opts) {
          if (opts.nostroke) {
            if ($('#mode_connect').hasClass('tool_button_current')) {
              svgEditor.clickSelect();
            }
          }
          $('#mode_connect')
            .toggleClass('disabled', opts.nostroke);
        }
      };
    }
  };
  