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'use strict';

exports.type = 'full';

exports.active = true;

exports.description = 'remove or cleanup enable-background attribute when possible';

/**
 * Remove or cleanup enable-background attr which coincides with a width/height box.
 *
 * @see http://www.w3.org/TR/SVG/filters.html#EnableBackgroundProperty
 *
 * @example
 * 
 *             ⬇
 * 
 *
 * @param {Object} item current iteration item
 * @return {Boolean} if false, item will be filtered out
 *
 * @author Kir Belevich
 */
exports.fn = function(data) {

    var regEnableBackground = /^new\s0\s0\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)$/,
        hasFilter = false,
        elems = ['svg', 'mask', 'pattern'];

    function checkEnableBackground(item) {
        if (
            item.isElem(elems) &&
            item.hasAttr('enable-background') &&
            item.hasAttr('width') &&
            item.hasAttr('height')
        ) {

            var match = item.attr('enable-background').value.match(regEnableBackground);

            if (match) {
                if (
                    item.attr('width').value === match[1] &&
                    item.attr('height').value === match[3]
                ) {
                    if (item.isElem('svg')) {
                        item.removeAttr('enable-background');
                    } else {
                        item.attr('enable-background').value = 'new';
                    }
                }
            }

        }
    }

    function checkForFilter(item) {
        if (item.isElem('filter')) {
            hasFilter = true;
        }
    }

    function monkeys(items, fn) {
        items.content.forEach(function(item) {
            fn(item);

            if (item.content) {
                monkeys(item, fn);
            }
        });
        return items;
    }

    var firstStep = monkeys(data, function(item) {
        checkEnableBackground(item);
        if (!hasFilter) {
            checkForFilter(item);
        }
    });

    return hasFilter ? firstStep : monkeys(firstStep, function(item) {
            //we don't need 'enable-background' if we have no filters
            item.removeAttr('enable-background');
        });
};