import Utils from '../../../utils/utils';
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export default function (newActiveIndex) {
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const swiper = this;
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const translate = swiper.rtlTranslate ? swiper.translate : -swiper.translate;
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const {
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slidesGrid, snapGrid, params, activeIndex: previousIndex, realIndex: previousRealIndex, snapIndex: previousSnapIndex,
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} = swiper;
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let activeIndex = newActiveIndex;
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let snapIndex;
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if (typeof activeIndex === 'undefined') {
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for (let i = 0; i < slidesGrid.length; i += 1) {
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if (typeof slidesGrid[i + 1] !== 'undefined') {
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if (translate >= slidesGrid[i] && translate < slidesGrid[i + 1] - ((slidesGrid[i + 1] - slidesGrid[i]) / 2)) {
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activeIndex = i;
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} else if (translate >= slidesGrid[i] && translate < slidesGrid[i + 1]) {
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activeIndex = i + 1;
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}
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} else if (translate >= slidesGrid[i]) {
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activeIndex = i;
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}
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}
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// Normalize slideIndex
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if (params.normalizeSlideIndex) {
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if (activeIndex < 0 || typeof activeIndex === 'undefined') activeIndex = 0;
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}
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}
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if (snapGrid.indexOf(translate) >= 0) {
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snapIndex = snapGrid.indexOf(translate);
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} else {
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const skip = Math.min(params.slidesPerGroupSkip, activeIndex);
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snapIndex = skip + Math.floor((activeIndex - skip) / params.slidesPerGroup);
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}
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if (snapIndex >= snapGrid.length) snapIndex = snapGrid.length - 1;
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if (activeIndex === previousIndex) {
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if (snapIndex !== previousSnapIndex) {
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swiper.snapIndex = snapIndex;
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swiper.emit('snapIndexChange');
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}
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return;
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}
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// Get real index
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const realIndex = parseInt(swiper.slides.eq(activeIndex).attr('data-swiper-slide-index') || activeIndex, 10);
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Utils.extend(swiper, {
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snapIndex,
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realIndex,
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previousIndex,
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activeIndex,
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});
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swiper.emit('activeIndexChange');
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swiper.emit('snapIndexChange');
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if (previousRealIndex !== realIndex) {
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swiper.emit('realIndexChange');
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}
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if (swiper.initialized || swiper.params.runCallbacksOnInit) {
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swiper.emit('slideChange');
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}
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}
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