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import { sanitizeInnerHtml } from '../shared/sanitizeString'

import generateTruthyString from '../shared/generateTruthyString'

import { isFalse, isText, isUndefined } from '../shared/nodes'

import { anchorableElement } from './anchorableNode'

import client from './client'

import { eventCallbacks, eventSubjects, generateCallback, generateSubject } from './events'

import { reref } from './ref'

import render from './render'

function updateAttributes(selector, currentAttributes, nextAttributes) {

const attributeNames = Object.keys({ ...currentAttributes, ...nextAttributes })

for (const name of attributeNames) {

if (name === 'debounce') continue

if (name === 'ref' && nextAttributes?.ref?.property) {

reref(nextAttributes, selector)

} else if (name === 'html') {

if (nextAttributes[name] !== currentAttributes[name]) {

selector.innerHTML = sanitizeInnerHtml(nextAttributes[name])

anchorableElement(selector)

}

} else if (name === 'checked' || name === 'value') {

if (nextAttributes[name] !== currentAttributes[name] && nextAttributes[name] !== selector[name]) {

selector[name] = nextAttributes[name]

}

} else if (name.startsWith('on')) {

const eventName = name.substring(2)

const eventNames = eventCallbacks.get(selector)

if (!eventNames) {

selector.addEventListener(eventName, generateCallback(selector, name))

} else {

const callback = eventNames[name]

if (callback && !nextAttributes[name]) {

selector.removeEventListener(eventName, callback)

delete eventNames[name]

} else if (nextAttributes[name]) {

if (!callback) {

selector.addEventListener(eventName, generateCallback(selector, name))

}

generateSubject(selector, nextAttributes, name)

eventSubjects.set(selector, nextAttributes)

}

}

} else {

let currentValue

if ((name === 'class' || name === 'style') && Array.isArray(currentAttributes[name])) {

currentValue = generateTruthyString(currentAttributes[name])

} else {

currentValue = currentAttributes[name]

}

let nextValue

if ((name === 'class' || name === 'style') && Array.isArray(nextAttributes[name])) {

nextValue = generateTruthyString(nextAttributes[name])

} else {

nextValue = nextAttributes[name]

}

const type = typeof nextValue

if (type !== 'object' && type !== 'function') {

if (currentValue !== undefined && nextValue === undefined) {

selector.removeAttribute(name)

} else if (currentValue !== nextValue) {

if ((name !== 'value' && nextValue === false) || nextValue === null || nextValue === undefined) {

selector.removeAttribute(name)

} else if (name !== 'value' && nextValue === true) {

selector.setAttribute(name, '')

} else {

selector.setAttribute(name, nextValue)

}

}

}

}

}

}

function updateHeadChild(current, next) {

if (isUndefined(current) && !isUndefined(next)) {

const nextSelector = render(next)

client.head.append(nextSelector)

return

}

if (!isUndefined(current) && isUndefined(next)) {

current.element.remove()

return

}

next.element = current.element

if (isFalse(current) && isFalse(next)) {

return

}

if (current.type !== next.type) {

const nextSelector = render(next)

current.element.replaceWith(nextSelector)

return

}

updateAttributes(current.element, current.attributes, next.attributes)

}

function updateHeadChildren(currentChildren, nextChildren) {

const limit = Math.max(currentChildren.length, nextChildren.length)

for (let i = 0; i < limit; i++) {

updateHeadChild(currentChildren[i], nextChildren[i])

}

}

function _rerender(current, next, isParentSvg = false) {

const selector = current.element

next.element = current.element

if (isFalse(current) && isFalse(next)) {

return

}

const isSvg = isParentSvg || next.type === 'svg'

if (current.type !== next.type) {

const nextSelector = render(next, isSvg)

selector.replaceWith(nextSelector)

return

}

if (current.type === 'textarea') {

current.attributes.value = current.children[0].text

next.attributes.value = next.children[0].text

updateAttributes(selector, current.attributes, next.attributes)

return

}

if (isText(current) && isText(next)) {

if (current.text !== next.text) {

selector.textContent = next.text

}

return

}

if (!next.attributes.html) {

const limit = Math.max(current.children.length, next.children.length)

if (next.children.length > current.children.length) {

for (let i = 0; i < current.children.length; i++) {

_rerender(current.children[i], next.children[i], isSvg)

}

for (let i = current.children.length; i < next.children.length; i++) {

const nextSelector = render(next.children[i], isSvg)

selector.appendChild(nextSelector)

}

} else if (current.children.length > next.children.length) {

for (let i = 0; i < next.children.length; i++) {

_rerender(current.children[i], next.children[i], isSvg)

}

for (let i = current.children.length - 1; i >= next.children.length; i--) {

selector.childNodes[i].remove()

}

} else {

for (let i = limit - 1; i > -1; i--) {

_rerender(current.children[i], next.children[i], isSvg)

}

}

}

updateAttributes(selector, current.attributes, next.attributes)

}

export default function rerender() {

_rerender(client.virtualDom, client.nextVirtualDom)

updateAttributes(client.body, client.currentMeta.body, client.nextMeta.body)

updateAttributes(window, client.currentMeta.window, client.nextMeta.window)

updateAttributes(client.body.parentElement, client.currentMeta.html, client.nextMeta.html)

updateHeadChildren(client.currentHead, client.nextHead)

client.virtualDom = client.nextVirtualDom

client.nextVirtualDom = null

client.currentMeta = client.nextMeta

client.nextMeta = { body: {}, html: {}, window: {} }

client.currentHead = client.nextHead

client.nextHead = []

}