import { state } from '../state'
// import { Section } from '../types'
import { ClassName, SlideClassName } from '../utils/class.enum'

export function initializeDOM() {
	const htmlElement = document.querySelector('html')
	htmlElement.classList.add(ClassName.html)

	const bodyElement = document.querySelector('body')
	bodyElement.classList.add(ClassName.body)

	state.container.classList.add(ClassName.container)

	const transition = `transform ${state.scrollingSpeed}ms ${state.transitionTimingFunction}`
	state.container.style.transition = transition

	prepareSections()

	state.scrollMode === 'automatic' ? prepareScrollModeAutomaticDOM() : prepareScrollModeManualDOM()
}

function prepareSections() {
	state.sections = Array.from(state.container.children).map((element) => {
		const section = element as HTMLElement

		const childrens = Array.from(section.children) as HTMLElement[]

		const foundSlides = childrens.filter((slide) => slide.hasAttribute(state.slidesIdentifyAttribute))
		foundSlides.forEach((slide) => slide.classList.add(ClassName.slide))

		if (!foundSlides.length) return { element: section, slides: null }

		const container = preapreSectionForSlides(section, foundSlides)

		const slides = { container, elements: foundSlides }

		return { element: section, slides }
	})

	state.sections.forEach((section) => section.element.classList.add(ClassName.section))
}

function preapreSectionForSlides(section: HTMLElement, slides: HTMLElement[]): HTMLElement {
	const wrapperElement = document.createElement('div')
	wrapperElement.classList.add(SlideClassName.wrapper)

	const transition = `transform ${state.scrollingSpeed}ms ${state.transitionTimingFunction}`
	wrapperElement.style.transition = transition
	wrapperElement.style.width = `${slides.length * 100}%`

	slides.forEach((slide) => {
		slide.style.width = `${100 / slides.length}%`

		wrapperElement.appendChild(slide)
	})

	const containerElement = document.createElement('div')
	containerElement.classList.add(ClassName.sectionWithSlides)

	containerElement.appendChild(wrapperElement)

	section.appendChild(containerElement)

	return wrapperElement
}

export function destroyDOM() {
	const htmlElement = document.querySelector('html')
	htmlElement.classList.remove(ClassName.html)

	const bodyElement = document.querySelector('body')
	bodyElement.classList.remove(ClassName.body)

	state.container.classList.remove(ClassName.container)

	state.container.style.transition = ''
	state.container.style.transform = 'none'
	state.container.style.webkitTransform = 'none'

	state.sections.forEach((section) => section.element.classList.remove(ClassName.section))
}

export function prepareScrollModeAutomaticDOM() {
	const bodyElement = document.querySelector('body')

	bodyElement.style.overflow = 'hidden'
	bodyElement.style.height = '100%'

	const htmlElement = document.querySelector('html')

	htmlElement.style.overflow = 'hidden'
	htmlElement.style.height = '100%'

	const transition = `transform ${state.scrollingSpeed}ms ${state.transitionTimingFunction}`
	state.container.style.transition = transition
}

export function prepareScrollModeManualDOM() {
	const bodyElement = document.querySelector('body')

	bodyElement.style.overflow = 'auto'
	bodyElement.style.height = 'initial'

	const htmlElement = document.querySelector('html')

	htmlElement.style.overflow = 'auto'
	htmlElement.style.height = 'initial'

	state.container.style.transition = ''
	state.container.style.transform = 'none'
	state.container.style.webkitTransform = 'none'
}