/* globals jQuery, svgEditor, svgedit */
/*
 * ext-eyedropper.js
 *
 * Licensed under the MIT License
 *
 * Copyright(c) 2010 Jeff Schiller
 *
 */

// Dependencies:
// 1) jQuery
// 2) history.js
// 3) svg_editor.js
// 4) svgcanvas.js

svgEditor.addExtension('eyedropper', function (S) {
  const $ = jQuery;
  const // {svgcontent} = S,
    // svgdoc = S.svgroot.parentNode.ownerDocument,
    svgCanvas = svgEditor.canvas,
    {ChangeElementCommand} = svgedit.history,
    addToHistory = function (cmd) { svgCanvas.undoMgr.addCommandToHistory(cmd); },
    currentStyle = {
      fillPaint: 'red', fillOpacity: 1.0,
      strokePaint: 'black', strokeOpacity: 1.0,
      strokeWidth: 5, strokeDashArray: null,
      opacity: 1.0,
      strokeLinecap: 'butt',
      strokeLinejoin: 'miter'
    };

  function getStyle (opts) {
    // if we are in eyedropper mode, we don't want to disable the eye-dropper tool
    const mode = svgCanvas.getMode();
    if (mode === 'eyedropper') { return; }

    const tool = $('#tool_eyedropper');
    // enable-eye-dropper if one element is selected
    let elem = null;
    if (!opts.multiselected && opts.elems[0] &&
      !['svg', 'g', 'use'].includes(opts.elems[0].nodeName)
    ) {
      elem = opts.elems[0];
      tool.removeClass('disabled');
      // grab the current style
      currentStyle.fillPaint = elem.getAttribute('fill') || 'black';
      currentStyle.fillOpacity = elem.getAttribute('fill-opacity') || 1.0;
      currentStyle.strokePaint = elem.getAttribute('stroke');
      currentStyle.strokeOpacity = elem.getAttribute('stroke-opacity') || 1.0;
      currentStyle.strokeWidth = elem.getAttribute('stroke-width');
      currentStyle.strokeDashArray = elem.getAttribute('stroke-dasharray');
      currentStyle.strokeLinecap = elem.getAttribute('stroke-linecap');
      currentStyle.strokeLinejoin = elem.getAttribute('stroke-linejoin');
      currentStyle.opacity = elem.getAttribute('opacity') || 1.0;
    // disable eye-dropper tool
    } else {
      tool.addClass('disabled');
    }
  }

  return {
    name: 'eyedropper',
    svgicons: svgEditor.curConfig.extPath + 'eyedropper-icon.xml',
    buttons: [{
      id: 'tool_eyedropper',
      type: 'mode',
      title: 'Eye Dropper Tool',
      key: 'I',
      events: {
        click () {
          svgCanvas.setMode('eyedropper');
        }
      }
    }],

    // if we have selected an element, grab its paint and enable the eye dropper button
    selectedChanged: getStyle,
    elementChanged: getStyle,

    mouseDown (opts) {
      const mode = svgCanvas.getMode();
      if (mode === 'eyedropper') {
        const e = opts.event;
        const {target} = e;
        if (!['svg', 'g', 'use'].includes(target.nodeName)) {
          const changes = {};

          const change = function (elem, attrname, newvalue) {
            changes[attrname] = elem.getAttribute(attrname);
            elem.setAttribute(attrname, newvalue);
          };

          if (currentStyle.fillPaint) { change(target, 'fill', currentStyle.fillPaint); }
          if (currentStyle.fillOpacity) { change(target, 'fill-opacity', currentStyle.fillOpacity); }
          if (currentStyle.strokePaint) { change(target, 'stroke', currentStyle.strokePaint); }
          if (currentStyle.strokeOpacity) { change(target, 'stroke-opacity', currentStyle.strokeOpacity); }
          if (currentStyle.strokeWidth) { change(target, 'stroke-width', currentStyle.strokeWidth); }
          if (currentStyle.strokeDashArray) { change(target, 'stroke-dasharray', currentStyle.strokeDashArray); }
          if (currentStyle.opacity) { change(target, 'opacity', currentStyle.opacity); }
          if (currentStyle.strokeLinecap) { change(target, 'stroke-linecap', currentStyle.strokeLinecap); }
          if (currentStyle.strokeLinejoin) { change(target, 'stroke-linejoin', currentStyle.strokeLinejoin); }

          addToHistory(new ChangeElementCommand(target, changes));
        }
      }
    }
  };
});