var svgEditorExtension_markers = (function () {
  'use strict';

  /* globals jQuery */
  /*
   * ext-markers.js
   *
   * Licensed under the Apache License, Version 2
   *
   * Copyright(c) 2010 Will Schleter
   *   based on ext-arrows.js by Copyright(c) 2010 Alexis Deveria
   *
   * This extension provides for the addition of markers to the either end
   * or the middle of a line, polyline, path, polygon.
   *
   * Markers may be either a graphic or arbitary text
   *
   * to simplify the coding and make the implementation as robust as possible,
   * markers are not shared - every object has its own set of markers.
   * this relationship is maintained by a naming convention between the
   * ids of the markers and the ids of the object
   *
   * The following restrictions exist for simplicty of use and programming
   *    objects and their markers to have the same color
   *    marker size is fixed
   *    text marker font, size, and attributes are fixed
   *    an application specific attribute - se_type - is added to each marker element
   *        to store the type of marker
   *
   * TODO:
   *    remove some of the restrictions above
   *    add option for keeping text aligned to horizontal
   *    add support for dimension extension lines
   *
   */

  var extMarkers = {
    name: 'Markers',
    init: function init(S) {
      var svgEditor = this;
      var $ = jQuery;
      var svgCanvas = svgEditor.canvas;
      var // {svgcontent} = S,
      addElem = S.addSvgElementFromJson;
      var mtypes = ['start', 'mid', 'end'];
      var markerPrefix = 'se_marker_';
      var idPrefix = 'mkr_';

      // note - to add additional marker types add them below with a unique id
      // and add the associated icon(s) to marker-icons.svg
      // the geometry is normallized to a 100x100 box with the origin at lower left
      // Safari did not like negative values for low left of viewBox
      // remember that the coordinate system has +y downward
      var markerTypes = {
        nomarker: {},
        leftarrow: { element: 'path', attr: { d: 'M0,50 L100,90 L70,50 L100,10 Z' } },
        rightarrow: { element: 'path', attr: { d: 'M100,50 L0,90 L30,50 L0,10 Z' } },
        textmarker: { element: 'text', attr: { x: 0, y: 0, 'stroke-width': 0, stroke: 'none', 'font-size': 75, 'font-family': 'serif', 'text-anchor': 'left',
            'xml:space': 'preserve' } },
        forwardslash: { element: 'path', attr: { d: 'M30,100 L70,0' } },
        reverseslash: { element: 'path', attr: { d: 'M30,0 L70,100' } },
        verticalslash: { element: 'path', attr: { d: 'M50,0 L50,100' } },
        box: { element: 'path', attr: { d: 'M20,20 L20,80 L80,80 L80,20 Z' } },
        star: { element: 'path', attr: { d: 'M10,30 L90,30 L20,90 L50,10 L80,90 Z' } },
        xmark: { element: 'path', attr: { d: 'M20,80 L80,20 M80,80 L20,20' } },
        triangle: { element: 'path', attr: { d: 'M10,80 L50,20 L80,80 Z' } },
        mcircle: { element: 'circle', attr: { r: 30, cx: 50, cy: 50 } }
      };

      var langList = {
        en: [{ id: 'start_marker_list', title: 'Select start marker type' }, { id: 'mid_marker_list', title: 'Select mid marker type' }, { id: 'end_marker_list', title: 'Select end marker type' }, { id: 'nomarker', title: 'No Marker' }, { id: 'leftarrow', title: 'Left Arrow' }, { id: 'rightarrow', title: 'Right Arrow' }, { id: 'textmarker', title: 'Text Marker' }, { id: 'forwardslash', title: 'Forward Slash' }, { id: 'reverseslash', title: 'Reverse Slash' }, { id: 'verticalslash', title: 'Vertical Slash' }, { id: 'box', title: 'Box' }, { id: 'star', title: 'Star' }, { id: 'xmark', title: 'X' }, { id: 'triangle', title: 'Triangle' }, { id: 'mcircle', title: 'Circle' }, { id: 'leftarrow_o', title: 'Open Left Arrow' }, { id: 'rightarrow_o', title: 'Open Right Arrow' }, { id: 'box_o', title: 'Open Box' }, { id: 'star_o', title: 'Open Star' }, { id: 'triangle_o', title: 'Open Triangle' }, { id: 'mcircle_o', title: 'Open Circle' }]
      };

      // duplicate shapes to support unfilled (open) marker types with an _o suffix
      $.each(['leftarrow', 'rightarrow', 'box', 'star', 'mcircle', 'triangle'], function (i, v) {
        markerTypes[v + '_o'] = markerTypes[v];
      });

      /**
      * @param elem - A graphic element will have an attribute like marker-start
      * @param attr - marker-start, marker-mid, or marker-end
      * @returns The marker element that is linked to the graphic element
      */
      function getLinked(elem, attr) {
        var str = elem.getAttribute(attr);
        if (!str) {
          return null;
        }
        var m = str.match(/\(#(.*)\)/);
        if (!m || m.length !== 2) {
          return null;
        }
        return S.getElem(m[1]);
      }

      function setIcon(pos, id) {
        if (id.substr(0, 1) !== '\\') {
          id = '\\textmarker';
        }
        var ci = '#' + idPrefix + pos + '_' + id.substr(1);
        svgEditor.setIcon('#cur_' + pos + '_marker_list', $(ci).children());
        $(ci).addClass('current').siblings().removeClass('current');
      }

      var selElems = void 0;
      // toggles context tool panel off/on
      // sets the controls with the selected element's settings
      function showPanel(on) {
        $('#marker_panel').toggle(on);

        if (on) {
          var el = selElems[0];

          var val = void 0,
              ci = void 0;
          $.each(mtypes, function (i, pos) {
            var m = getLinked(el, 'marker-' + pos);
            var txtbox = $('#' + pos + '_marker');
            if (!m) {
              val = '\\nomarker';
              ci = val;
              txtbox.hide(); // hide text box
            } else {
              if (!m.attributes.se_type) {
                return;
              } // not created by this extension
              val = '\\' + m.attributes.se_type.textContent;
              ci = val;
              if (val === '\\textmarker') {
                val = m.lastChild.textContent;
                // txtbox.show(); // show text box
              } else {
                txtbox.hide(); // hide text box
              }
            }
            txtbox.val(val);
            setIcon(pos, ci);
          });
        }
      }

      function addMarker(id, val) {
        var txtBoxBg = '#ffffff';
        var txtBoxBorder = 'none';
        var txtBoxStrokeWidth = 0;

        var marker = S.getElem(id);
        if (marker) {
          return;
        }

        if (val === '' || val === '\\nomarker') {
          return;
        }

        var el = selElems[0];
        var color = el.getAttribute('stroke');
        // NOTE: Safari didn't like a negative value in viewBox
        // so we use a standardized 0 0 100 100
        // with 50 50 being mapped to the marker position
        var strokeWidth = 10;
        var refX = 50;
        var refY = 50;
        var viewBox = '0 0 100 100';
        var markerWidth = 5;
        var markerHeight = 5;
        var seType = void 0;
        if (val.substr(0, 1) === '\\') {
          seType = val.substr(1);
        } else {
          seType = 'textmarker';
        }

        if (!markerTypes[seType]) {
          return;
        } // an unknown type!

        // create a generic marker
        marker = addElem({
          element: 'marker',
          attr: {
            id: id,
            markerUnits: 'strokeWidth',
            orient: 'auto',
            style: 'pointer-events:none',
            se_type: seType
          }
        });

        if (seType !== 'textmarker') {
          var mel = addElem(markerTypes[seType]);
          var fillcolor = seType.substr(-2) === '_o' ? 'none' : color;

          mel.setAttribute('fill', fillcolor);
          mel.setAttribute('stroke', color);
          mel.setAttribute('stroke-width', strokeWidth);
          marker.append(mel);
        } else {
          var text = addElem(markerTypes[seType]);
          // have to add text to get bounding box
          text.textContent = val;
          var tb = text.getBBox();
          // alert(tb.x + ' ' + tb.y + ' ' + tb.width + ' ' + tb.height);
          var pad = 1;
          var bb = tb;
          bb.x = 0;
          bb.y = 0;
          bb.width += pad * 2;
          bb.height += pad * 2;
          // shift text according to its size
          text.setAttribute('x', pad);
          text.setAttribute('y', bb.height - pad - tb.height / 4); // kludge?
          text.setAttribute('fill', color);
          refX = bb.width / 2 + pad;
          refY = bb.height / 2 + pad;
          viewBox = bb.x + ' ' + bb.y + ' ' + bb.width + ' ' + bb.height;
          markerWidth = bb.width / 10;
          markerHeight = bb.height / 10;

          var box = addElem({
            element: 'rect',
            attr: {
              x: bb.x,
              y: bb.y,
              width: bb.width,
              height: bb.height,
              fill: txtBoxBg,
              stroke: txtBoxBorder,
              'stroke-width': txtBoxStrokeWidth
            }
          });
          marker.setAttribute('orient', 0);
          marker.append(box, text);
        }

        marker.setAttribute('viewBox', viewBox);
        marker.setAttribute('markerWidth', markerWidth);
        marker.setAttribute('markerHeight', markerHeight);
        marker.setAttribute('refX', refX);
        marker.setAttribute('refY', refY);
        S.findDefs().append(marker);

        return marker;
      }

      function convertline(elem) {
        // this routine came from the connectors extension
        // it is needed because midpoint markers don't work with line elements
        if (!(elem.tagName === 'line')) {
          return elem;
        }

        // Convert to polyline to accept mid-arrow

        var x1 = Number(elem.getAttribute('x1'));
        var x2 = Number(elem.getAttribute('x2'));
        var y1 = Number(elem.getAttribute('y1'));
        var y2 = Number(elem.getAttribute('y2'));
        var id = elem.id;


        var midPt = ' ' + (x1 + x2) / 2 + ',' + (y1 + y2) / 2 + ' ';
        var pline = addElem({
          element: 'polyline',
          attr: {
            points: x1 + ',' + y1 + midPt + x2 + ',' + y2,
            stroke: elem.getAttribute('stroke'),
            'stroke-width': elem.getAttribute('stroke-width'),
            fill: 'none',
            opacity: elem.getAttribute('opacity') || 1
          }
        });
        $.each(mtypes, function (i, pos) {
          // get any existing marker definitions
          var nam = 'marker-' + pos;
          var m = elem.getAttribute(nam);
          if (m) {
            pline.setAttribute(nam, elem.getAttribute(nam));
          }
        });

        var batchCmd = new S.BatchCommand();
        batchCmd.addSubCommand(new S.RemoveElementCommand(elem, elem.parentNode));
        batchCmd.addSubCommand(new S.InsertElementCommand(pline));

        $(elem).after(pline).remove();
        svgCanvas.clearSelection();
        pline.id = id;
        svgCanvas.addToSelection([pline]);
        S.addCommandToHistory(batchCmd);
        return pline;
      }

      function setMarker() {
        var poslist = { start_marker: 'start', mid_marker: 'mid', end_marker: 'end' };
        var pos = poslist[this.id];
        var markerName = 'marker-' + pos;
        var el = selElems[0];
        var marker = getLinked(el, markerName);
        if (marker) {
          $(marker).remove();
        }
        el.removeAttribute(markerName);
        var val = this.value;
        if (val === '') {
          val = '\\nomarker';
        }
        if (val === '\\nomarker') {
          setIcon(pos, val);
          S.call('changed', selElems);
          return;
        }
        // Set marker on element
        var id = markerPrefix + pos + '_' + el.id;
        addMarker(id, val);
        svgCanvas.changeSelectedAttribute(markerName, 'url(#' + id + ')');
        if (el.tagName === 'line' && pos === 'mid') {
          el = convertline(el);
        }
        S.call('changed', selElems);
        setIcon(pos, val);
      }

      // called when the main system modifies an object
      // this routine changes the associated markers to be the same color
      function colorChanged(elem) {
        var color = elem.getAttribute('stroke');

        $.each(mtypes, function (i, pos) {
          var marker = getLinked(elem, 'marker-' + pos);
          if (!marker) {
            return;
          }
          if (!marker.attributes.se_type) {
            return;
          } // not created by this extension
          var ch = marker.lastElementChild;
          if (!ch) {
            return;
          }
          var curfill = ch.getAttribute('fill');
          var curstroke = ch.getAttribute('stroke');
          if (curfill && curfill !== 'none') {
            ch.setAttribute('fill', color);
          }
          if (curstroke && curstroke !== 'none') {
            ch.setAttribute('stroke', color);
          }
        });
      }

      // called when the main system creates or modifies an object
      // primary purpose is create new markers for cloned objects
      function updateReferences(el) {
        $.each(mtypes, function (i, pos) {
          var id = markerPrefix + pos + '_' + el.id;
          var markerName = 'marker-' + pos;
          var marker = getLinked(el, markerName);
          if (!marker || !marker.attributes.se_type) {
            return;
          } // not created by this extension
          var url = el.getAttribute(markerName);
          if (url) {
            var len = el.id.length;
            var linkid = url.substr(-len - 1, len);
            if (el.id !== linkid) {
              var val = $('#' + pos + '_marker').attr('value');
              addMarker(id, val);
              svgCanvas.changeSelectedAttribute(markerName, 'url(#' + id + ')');
              if (el.tagName === 'line' && pos === 'mid') {
                el = convertline(el);
              }
              S.call('changed', selElems);
            }
          }
        });
      }

      // simulate a change event a text box that stores the current element's marker type
      function triggerTextEntry(pos, val) {
        $('#' + pos + '_marker').val(val);
        $('#' + pos + '_marker').change();
        // const txtbox = $('#'+pos+'_marker');
        // if (val.substr(0,1)=='\\') {txtbox.hide();}
        // else {txtbox.show();}
      }

      function showTextPrompt(pos) {
        var def = $('#' + pos + '_marker').val();
        if (def.substr(0, 1) === '\\') {
          def = '';
        }
        $.prompt('Enter text for ' + pos + ' marker', def, function (txt) {
          if (txt) {
            triggerTextEntry(pos, txt);
          }
        });
      }

      /*
      function setMarkerSet(obj) {
        const parts = this.id.split('_');
        const set = parts[2];
        switch (set) {
        case 'off':
          triggerTextEntry('start','\\nomarker');
          triggerTextEntry('mid','\\nomarker');
          triggerTextEntry('end','\\nomarker');
          break;
        case 'dimension':
          triggerTextEntry('start','\\leftarrow');
          triggerTextEntry('end','\\rightarrow');
          showTextPrompt('mid');
          break;
        case 'label':
          triggerTextEntry('mid','\\nomarker');
          triggerTextEntry('end','\\rightarrow');
          showTextPrompt('start');
          break;
        }
      }
      */
      // callback function for a toolbar button click
      function setArrowFromButton(obj) {
        var parts = this.id.split('_');
        var pos = parts[1];
        var val = parts[2];
        if (parts[3]) {
          val += '_' + parts[3];
        }

        if (val !== 'textmarker') {
          triggerTextEntry(pos, '\\' + val);
        } else {
          showTextPrompt(pos);
        }
      }

      function getTitle() {
        var lang = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'en';
        var id = arguments[1];

        var list = langList[lang];
        for (var i in list) {
          if (list.hasOwnProperty(i) && list[i].id === id) {
            return list[i].title;
          }
        }
        return id;
      }

      // build the toolbar button array from the marker definitions
      function buildButtonList(lang) {
        var buttons = [];
        // const i = 0;
        /*
        buttons.push({
          id: idPrefix + 'markers_off',
          title: 'Turn off all markers',
          type: 'context',
          events: { click: setMarkerSet },
          panel: 'marker_panel'
        });
        buttons.push({
          id: idPrefix + 'markers_dimension',
          title: 'Dimension',
          type: 'context',
          events: { click: setMarkerSet },
          panel: 'marker_panel'
        });
        buttons.push({
          id: idPrefix + 'markers_label',
          title: 'Label',
          type: 'context',
          events: { click: setMarkerSet },
          panel: 'marker_panel'
        });
        */
        $.each(mtypes, function (k, pos) {
          var listname = pos + '_marker_list';
          var def = true;
          $.each(markerTypes, function (id, v) {
            var title = getTitle(lang, String(id));
            buttons.push({
              id: idPrefix + pos + '_' + id,
              svgicon: id,
              title: title,
              type: 'context',
              events: { click: setArrowFromButton },
              panel: 'marker_panel',
              list: listname,
              isDefault: def
            });
            def = false;
          });
        });
        return buttons;
      }

      var currentLang = void 0;
      var ret = {
        name: 'Markers',
        svgicons: svgEditor.curConfig.extIconsPath + 'markers-icons.xml',
        callback: function callback() {
          $('#marker_panel').addClass('toolset').hide();
        },
        addLangData: function addLangData(lang) {
          currentLang = lang;
          return { data: langList[lang] };
        },
        selectedChanged: function selectedChanged(opts) {
          // Use this to update the current selected elements
          // console.log('selectChanged',opts);
          selElems = opts.elems;

          var markerElems = ['line', 'path', 'polyline', 'polygon'];

          var i = selElems.length;
          while (i--) {
            var elem = selElems[i];
            if (elem && markerElems.includes(elem.tagName)) {
              if (opts.selectedElement && !opts.multiselected) {
                showPanel(true);
              } else {
                showPanel(false);
              }
            } else {
              showPanel(false);
            }
          }
        },
        elementChanged: function elementChanged(opts) {
          // console.log('elementChanged',opts);
          var elem = opts.elems[0];
          if (elem && (elem.getAttribute('marker-start') || elem.getAttribute('marker-mid') || elem.getAttribute('marker-end'))) {
            colorChanged(elem);
            updateReferences(elem);
          }
          // changing_flag = false; // Not apparently in use
        }
      };
      // Todo: Check if the lang will be available in time
      Object.defineProperties(ret, {
        buttons: {
          get: function get() {
            return buildButtonList(currentLang);
          }
        },
        context_tools: {
          get: function get() {
            return [{
              type: 'input',
              panel: 'marker_panel',
              title: 'Start marker',
              id: 'start_marker',
              label: 's',
              size: 3,
              events: { change: setMarker }
            }, {
              type: 'button-select',
              panel: 'marker_panel',
              title: getTitle(currentLang, 'start_marker_list'),
              id: 'start_marker_list',
              colnum: 3,
              events: { change: setArrowFromButton }
            }, {
              type: 'input',
              panel: 'marker_panel',
              title: 'Middle marker',
              id: 'mid_marker',
              label: 'm',
              defval: '',
              size: 3,
              events: { change: setMarker }
            }, {
              type: 'button-select',
              panel: 'marker_panel',
              title: getTitle(currentLang, 'mid_marker_list'),
              id: 'mid_marker_list',
              colnum: 3,
              events: { change: setArrowFromButton }
            }, {
              type: 'input',
              panel: 'marker_panel',
              title: 'End marker',
              id: 'end_marker',
              label: 'e',
              size: 3,
              events: { change: setMarker }
            }, {
              type: 'button-select',
              panel: 'marker_panel',
              title: getTitle(currentLang, 'end_marker_list'),
              id: 'end_marker_list',
              colnum: 3,
              events: { change: setArrowFromButton }
            }];
          }
        }
      });
      return ret;
    }
  };

  return extMarkers;

}());