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'use strict';

const { detachNodeFromParent } = require('../lib/xast.js');
const { computeStyle } = require('../lib/style.js');
const { path2js, js2path, intersects } = require('./_path.js');

exports.type = 'visitor';
exports.active = true;
exports.description = 'merges multiple paths in one if possible';

/**
 * Merge multiple Paths into one.
 *
 * @param {Object} root
 * @param {Object} params
 *
 * @author Kir Belevich, Lev Solntsev
 */
exports.fn = (root, params) => {
  const {
    force = false,
    floatPrecision,
    noSpaceAfterFlags = false, // a20 60 45 0 1 30 20 → a20 60 45 0130 20
  } = params;

  return {
    element: {
      enter: (node) => {
        let prevChild = null;

        for (const child of node.children) {
          // skip if previous element is not path or contains animation elements
          if (
            prevChild == null ||
            prevChild.type !== 'element' ||
            prevChild.name !== 'path' ||
            prevChild.children.length !== 0 ||
            prevChild.attributes.d == null
          ) {
            prevChild = child;
            continue;
          }

          // skip if element is not path or contains animation elements
          if (
            child.type !== 'element' ||
            child.name !== 'path' ||
            child.children.length !== 0 ||
            child.attributes.d == null
          ) {
            prevChild = child;
            continue;
          }

          // preserve paths with markers
          const computedStyle = computeStyle(child);
          if (
            computedStyle['marker-start'] ||
            computedStyle['marker-mid'] ||
            computedStyle['marker-end']
          ) {
            prevChild = child;
            continue;
          }

          const prevChildAttrs = Object.keys(prevChild.attributes);
          const childAttrs = Object.keys(child.attributes);
          let attributesAreEqual = prevChildAttrs.length === childAttrs.length;
          for (const name of childAttrs) {
            if (name !== 'd') {
              if (
                prevChild.attributes[name] == null ||
                prevChild.attributes[name] !== child.attributes[name]
              ) {
                attributesAreEqual = false;
              }
            }
          }
          const prevPathJS = path2js(prevChild);
          const curPathJS = path2js(child);

          if (
            attributesAreEqual &&
            (force || !intersects(prevPathJS, curPathJS))
          ) {
            js2path(prevChild, prevPathJS.concat(curPathJS), {
              floatPrecision,
              noSpaceAfterFlags,
            });
            detachNodeFromParent(child);
            continue;
          }

          prevChild = child;
        }
      },
    },
  };
};