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'use strict';

exports.type = 'perItem';

exports.active = true;

exports.description = 'merges multiple paths in one if possible';

exports.params = {
    collapseRepeated: true,
    force: false,
    leadingZero: true,
    negativeExtraSpace: true,
    noSpaceAfterFlags: true
};

var path2js = require('./_path.js').path2js,
    js2path = require('./_path.js').js2path,
    intersects = require('./_path.js').intersects;

/**
 * Merge multiple Paths into one.
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich, Lev Solntsev
 */
exports.fn = function(item, params) {

    if (!item.isElem() || item.isEmpty()) return;

    var prevContentItem = null,
        prevContentItemKeys = null;

    item.content = item.content.filter(function(contentItem) {

        if (prevContentItem &&
            prevContentItem.isElem('path') &&
            prevContentItem.isEmpty() &&
            prevContentItem.hasAttr('d') &&
            contentItem.isElem('path') &&
            contentItem.isEmpty() &&
            contentItem.hasAttr('d')
        ) {

            if (!prevContentItemKeys) {
                prevContentItemKeys = Object.keys(prevContentItem.attrs);
            }

            var contentItemAttrs = Object.keys(contentItem.attrs),
                equalData = prevContentItemKeys.length == contentItemAttrs.length &&
                    contentItemAttrs.every(function(key) {
                        return key == 'd' ||
                            prevContentItem.hasAttr(key) &&
                            prevContentItem.attr(key).value == contentItem.attr(key).value;
                    }),
                prevPathJS = path2js(prevContentItem),
                curPathJS = path2js(contentItem);

            if (equalData && (params.force || !intersects(prevPathJS, curPathJS))) {
                js2path(prevContentItem, prevPathJS.concat(curPathJS), params);
                return false;
            }
        }

        prevContentItem = contentItem;
        prevContentItemKeys = null;
        return true;

    });

};