import InfiniteScroll from 'infinite-scroll'
import { watchLayoutContainerForReveal } from '../animated-element'
import ctEvents from 'ct-events'

const generateQuerySelector = (el) => {
	let itemsToSkip = '.yit-wcan-container'

	const classesToSkip = [
		'active',
		'ct-active',
		'wpgb-enabled',
		'e-lazyloaded',
	]

	let parents = []

	let elem = el

	for (; elem && elem !== document; elem = elem.parentNode) {
		if (elem.matches(itemsToSkip)) {
			continue
		}

		parents.push(elem)
	}

	parents = parents.reverse()

	return parents
		.filter((el) => !el.matches('body, html'))
		.map((elForSelector) => {
			if (elForSelector === document.body) {
				return 'body'
			}

			let str = elForSelector.tagName

			if (elForSelector !== el) {
				str += elForSelector.id != '' ? '#' + elForSelector.id : ''
				str += elForSelector.dataset.target
					? `[data-target="${elForSelector.dataset.target}"]`
					: ''
			}

			if (elForSelector.className) {
				const classes = elForSelector.className.split(/\s/)

				for (let i = 0; i < classes.length; i++) {
					if (
						classes[i] &&
						classesToSkip.indexOf(classes[i]) === -1
					) {
						str += '.' + classes[i]
					}
				}
			}

			return str
		})
		.join(' > ')
}

/**
 * Monkey patch imagesLoaded. We are using here another strategy for detecting
 * images loaded event.
 */
InfiniteScroll.imagesLoaded = (fragment, fn) => fn()
InfiniteScroll.Button.prototype.hide = () => {}

export const mount = (paginationContainer) => {
	let layoutEl = [...paginationContainer.parentNode.children]
		.reduce(
			(a, c) => {
				return [...a, ...c.children]
			},
			[...paginationContainer.parentNode.children]
		)
		.find(
			(c) =>
				c.classList.contains('products') ||
				c.classList.contains('entries')
		)

	if (!paginationContainer) {
		return
	}

	let paginationType = paginationContainer.dataset.pagination

	if (paginationType.indexOf('simple') > -1) return
	if (paginationType.indexOf('next_prev') > -1) return

	if (!paginationContainer.querySelector('.next')) return

	if (paginationContainer.infiniteScroll) {
		return
	}

	const paginationSelector =
		getAppendSelectorFor(layoutEl, {
			toAppend: '.ct-pagination',
		}) || '.ct-pagination'

	let inf = new InfiniteScroll(layoutEl, {
		// debug: true,
		checkLastPage: `${paginationSelector} .next`,
		path: `${paginationSelector} .next`,
		append: getAppendSelectorFor(layoutEl),
		button:
			paginationType === 'load_more'
				? paginationContainer.querySelector('.ct-load-more')
				: null,

		outlayer: null,

		scrollThreshold: paginationType === 'infinite_scroll' ? 400 : false,

		onInit() {
			this.on('load', (response) => {
				paginationContainer
					.querySelector('.ct-load-more-helper')
					.classList.remove('ct-loading')

				setTimeout(() => {
					ctEvents.trigger('ct:infinite-scroll:load')
					ctEvents.trigger('blocksy:frontend:init')
					ctEvents.trigger('blocksy:parallax:init')
					if (window.jQuery) {
						jQuery(document.body).trigger(
							'wc_price_based_country_ajax_geolocation'
						)
					}
				}, 100)
			})

			this.on('append', () => {
				watchLayoutContainerForReveal(layoutEl)
				;[...layoutEl.querySelectorAll('[srcset]')].forEach((el) => {
					const prev = el.srcset
					el.srcset = ''
					el.srcset = prev
				})
			})

			this.on('request', () => {
				paginationContainer
					.querySelector('.ct-load-more-helper')
					.classList.add('ct-loading')
			})

			this.on('last', () => {
				paginationContainer.classList.add(
					!paginationContainer.querySelector('.ct-last-page-text')
						? 'ct-last-page-no-info'
						: 'ct-last-page'
				)
			})
		},
	})

	paginationContainer.infiniteScroll = inf
}

function getAppendSelectorFor(layoutEl, args = {}) {
	args = {
		toAppend: 'default',
		...args,
	}

	const layoutIndex = [...layoutEl.parentNode.parentNode.children].indexOf(
		layoutEl.parentNode
	)

	if (layoutEl.closest('.ct-posts-shortcode')) {
		if (layoutEl.classList.contains('products')) {
			return `.ct-posts-shortcode:nth-child(${layoutIndex + 1}) ${
				args.toAppend === 'default' ? '.products > li' : args.toAppend
			}`
		} else {
			return `.ct-posts-shortcode:nth-child(${layoutIndex + 1}) ${
				args.toAppend === 'default' ? '.entries > *' : args.toAppend
			}`
		}
	}

	if (layoutEl.closest('.wp-block-blocksy-query')) {
		return `.wp-block-blocksy-query[data-id="${
			layoutEl.closest('.wp-block-blocksy-query').dataset.id
		}"] ${args.toAppend === 'default' ? '.entries > *' : args.toAppend}`
	}

	if (layoutEl.classList.contains('products')) {
		const selector = generateQuerySelector(layoutEl, '[data-products]')

		if (args.toAppend !== 'default') {
			return null
		}

		return `${selector} > li`
	}

	return `section > ${
		args.toAppend === 'default' ? '.entries > *' : args.toAppend
	}`
}