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import CLASS from './class';
import { Chart } from './core';

Chart.prototype.focus = function (targetIds) {
    var $$ = this.internal, candidates;

    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))),

    this.revert();
    this.defocus();
    candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);
    if ($$.hasArcType()) {
        $$.expandArc(targetIds);
    }
    $$.toggleFocusLegend(targetIds, true);

    $$.focusedTargetIds = targetIds;
    $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function (id) {
        return targetIds.indexOf(id) < 0;
    });
};

Chart.prototype.defocus = function (targetIds) {
    var $$ = this.internal, candidates;

    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))),

    candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);
    if ($$.hasArcType()) {
        $$.unexpandArc(targetIds);
    }
    $$.toggleFocusLegend(targetIds, false);

    $$.focusedTargetIds = $$.focusedTargetIds.filter(function (id) {
        return targetIds.indexOf(id) < 0;
    });
    $$.defocusedTargetIds = targetIds;
};

Chart.prototype.revert = function (targetIds) {
    var $$ = this.internal, candidates;

    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets

    candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);
    if ($$.hasArcType()) {
        $$.unexpandArc(targetIds);
    }
    if ($$.config.legend_show) {
        $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
        $$.legend.selectAll($$.selectorLegends(targetIds))
            .filter(function () {
                return $$.d3.select(this).classed(CLASS.legendItemFocused);
            })
            .classed(CLASS.legendItemFocused, false);
    }

    $$.focusedTargetIds = [];
    $$.defocusedTargetIds = [];
};