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'use strict';

exports.type = 'perItem';

exports.active = true;

exports.description = 'removes useless stroke and fill attributes';

exports.params = {
  stroke: true,
  fill: true,
  removeNone: false,
  hasStyleOrScript: false,
};

var shape = require('./_collections').elemsGroups.shape,
  regStrokeProps = /^stroke/,
  regFillProps = /^fill-/,
  styleOrScript = ['style', 'script'];

/**
 * Remove useless stroke and fill attrs.
 *
 * @param {Object} item current iteration item
 * @param {Object} params plugin params
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function (item, params) {
  if (item.isElem(styleOrScript)) {
    params.hasStyleOrScript = true;
  }

  if (
    !params.hasStyleOrScript &&
    item.isElem(shape) &&
    !item.computedAttr('id')
  ) {
    var stroke = params.stroke && item.computedAttr('stroke'),
      fill = params.fill && !item.computedAttr('fill', 'none');

    // remove stroke*
    if (
      params.stroke &&
      (!stroke ||
        stroke == 'none' ||
        item.computedAttr('stroke-opacity', '0') ||
        item.computedAttr('stroke-width', '0'))
    ) {
      // stroke-width may affect the size of marker-end
      if (
        item.computedAttr('stroke-width', '0') === true ||
        item.computedAttr('marker-end') == null
      ) {
        var parentStroke = item.parentNode.computedAttr('stroke'),
          declineStroke = parentStroke && parentStroke != 'none';

        for (const name of Object.keys(item.attributes)) {
          if (regStrokeProps.test(name)) {
            delete item.attributes[name];
          }
        }

        if (declineStroke) {
          item.attributes.stroke = 'none';
        }
      }
    }

    // remove fill*
    if (params.fill && (!fill || item.computedAttr('fill-opacity', '0'))) {
      for (const name of Object.keys(item.attributes)) {
        if (regFillProps.test(name)) {
          delete item.attributes[name];
        }
      }

      if (fill) {
        item.attributes.fill = 'none';
      }
    }

    if (
      params.removeNone &&
      (!stroke || item.attributes.stroke == 'none') &&
      (!fill || item.attributes.fill == 'none')
    ) {
      return false;
    }
  }
};