(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
   *
   */

  svgEditor.addExtension('Markers', function (S) {
    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.appendChild(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.appendChild(box);
        marker.appendChild(text);
      }

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

}());