/*
 * HSDataTable
 * @version: 3.0.1
 * @author: Preline Labs Ltd.
 * @license: Licensed under MIT and Preline UI Fair Use License (https://preline.co/docs/license.html)
 * Copyright 2024 Preline Labs Ltd.
 */

import { Api } from 'datatables.net'

import { debounce, htmlToElement, classToClassList } from '../../utils'

import { IDataTableOptions, IDataTable } from './interfaces'

import HSBasePlugin from '../base-plugin'
import { ICollectionItem } from '../../interfaces'

declare var DataTable: any

interface IColumnDef {
  targets: number
  orderable: boolean
}

class HSDataTable extends HSBasePlugin<IDataTableOptions> implements IDataTable {
  private concatOptions: IDataTableOptions

  private dataTable: Api<any>

  private readonly table: HTMLTableElement

  private searches: HTMLElement[] | null

  private pageEntitiesList: (HTMLSelectElement | HTMLInputElement)[] | null

  private pagingList: HTMLElement[] | null
  private pagingPagesList: HTMLElement[] | null

  private pagingPrevList: HTMLElement[] | null
  private pagingNextList: HTMLElement[] | null

  private readonly infoList: HTMLElement[] | null

  private rowSelectingAll: HTMLElement | null
  private rowSelectingIndividual: string | null

  private maxPagesToShow: number
  private isRowSelecting: boolean
  private readonly pageBtnClasses: string | null

  private onSearchInputListener:
    | {
        el: Element
        fn: (evt: InputEvent) => void
      }[]
    | null
  private onPageEntitiesChangeListener:
    | {
        el: Element
        fn: (evt: InputEvent) => void
      }[]
    | null
  private onSinglePagingClickListener:
    | {
        el: Element
        fn: () => void
      }[]
    | null
  private onPagingPrevClickListener:
    | {
        el: Element
        fn: () => void
      }[]
    | null
  private onPagingNextClickListener:
    | {
        el: Element
        fn: () => void
      }[]
    | null
  private onRowSelectingAllChangeListener: () => void

  constructor(el: HTMLElement, options?: IDataTableOptions, events?: {}) {
    super(el, options, events)

    this.el = typeof el === 'string' ? document.querySelector(el) : el

    // Exclude columns from ordering
    const columnDefs: IColumnDef[] = []
    Array.from(this.el.querySelectorAll('thead th, thead td')).forEach((th: HTMLElement, ind: number) => {
      if (th.classList.contains('--exclude-from-ordering'))
        columnDefs.push({
          targets: ind,
          orderable: false
        })
    })

    const data = this.el.getAttribute('data-datatable')
    const dataOptions: IDataTableOptions = data ? JSON.parse(data) : {}

    this.concatOptions = {
      searching: true,
      lengthChange: false,
      order: [],
      columnDefs: [...columnDefs],
      ...dataOptions,
      ...options
    }

    this.table = this.el.querySelector('table')

    this.searches = Array.from(this.el.querySelectorAll('[data-datatable-search]')) ?? null

    this.pageEntitiesList = Array.from(this.el.querySelectorAll('[data-datatable-page-entities]')) ?? null

    this.pagingList = Array.from(this.el.querySelectorAll('[data-datatable-paging]')) ?? null
    this.pagingPagesList = Array.from(this.el.querySelectorAll('[data-datatable-paging-pages]')) ?? null
    this.pagingPrevList = Array.from(this.el.querySelectorAll('[data-datatable-paging-prev]')) ?? null
    this.pagingNextList = Array.from(this.el.querySelectorAll('[data-datatable-paging-next]')) ?? null

    this.infoList = Array.from(this.el.querySelectorAll('[data-datatable-info]')) ?? null

    if (this.concatOptions?.rowSelectingOptions)
      this.rowSelectingAll =
        (this.concatOptions?.rowSelectingOptions?.selectAllSelector
          ? document.querySelector(this.concatOptions?.rowSelectingOptions?.selectAllSelector)
          : document.querySelector('[data-datatable-row-selecting-all]')) ?? null
    if (this.concatOptions?.rowSelectingOptions)
      this.rowSelectingIndividual =
        this.concatOptions?.rowSelectingOptions?.individualSelector ??
        '[data-datatable-row-selecting-individual]' ??
        null

    if (this.pageEntitiesList.length) this.concatOptions.pageLength = parseInt(this.pageEntitiesList[0].value)

    this.maxPagesToShow = 3
    this.isRowSelecting = !!this.concatOptions?.rowSelectingOptions
    this.pageBtnClasses = this.concatOptions?.pagingOptions?.pageBtnClasses ?? null

    this.onSearchInputListener = []
    this.onPageEntitiesChangeListener = []
    this.onSinglePagingClickListener = []
    this.onPagingPrevClickListener = []
    this.onPagingNextClickListener = []

    this.init()
  }

  private init() {
    this.createCollection(window.$hsDataTableCollection, this)

    this.initTable()

    if (this.searches.length) this.initSearch()

    if (this.pageEntitiesList.length) this.initPageEntities()

    if (this.pagingList.length) this.initPaging()
    if (this.pagingPagesList.length) this.buildPagingPages()
    if (this.pagingPrevList.length) this.initPagingPrev()
    if (this.pagingNextList.length) this.initPagingNext()

    if (this.infoList.length) this.initInfo()

    if (this.isRowSelecting) this.initRowSelecting()
  }

  private initTable() {
    this.dataTable = new DataTable(this.table, this.concatOptions)

    if (this.isRowSelecting) this.triggerChangeEventToRow()

    this.dataTable.on('draw', () => {
      if (this.isRowSelecting) this.updateSelectAllCheckbox()
      if (this.isRowSelecting) this.triggerChangeEventToRow()
      this.updateInfo()
      this.pagingPagesList.forEach(el => this.updatePaging(el))
    })
  }

  private searchInput(evt: InputEvent) {
    this.onSearchInput((evt.target as HTMLInputElement).value)
  }

  private pageEntitiesChange(evt: Event) {
    this.onEntitiesChange(parseInt((evt.target as HTMLSelectElement).value), evt.target as HTMLSelectElement)
  }

  private pagingPrevClick() {
    this.onPrevClick()
  }

  private pagingNextClick() {
    this.onNextClick()
  }

  private rowSelectingAllChange() {
    this.onSelectAllChange()
  }

  private singlePagingClick(count: number) {
    this.onPageClick(count)
  }

  // Search
  private initSearch() {
    this.searches.forEach(el => {
      this.onSearchInputListener.push({
        el,
        fn: debounce((evt: InputEvent) => this.searchInput(evt))
      })

      el.addEventListener('input', this.onSearchInputListener.find(search => search.el === el).fn)
    })
  }

  private onSearchInput(val: string) {
    this.dataTable.search(val).draw()
  }

  // Page entities
  private initPageEntities() {
    this.pageEntitiesList.forEach(el => {
      this.onPageEntitiesChangeListener.push({
        el,
        fn: evt => this.pageEntitiesChange(evt)
      })

      el.addEventListener('change', this.onPageEntitiesChangeListener.find(pageEntity => pageEntity.el === el).fn)
    })
  }

  private onEntitiesChange(entities: number, target: HTMLSelectElement) {
    const otherEntities = this.pageEntitiesList.filter(el => el !== target)

    if (otherEntities.length)
      otherEntities.forEach(el => {
        if (window.HSSelect) {
          // @ts-ignore
          const hsSelectInstance = window.HSSelect.getInstance(el, true)
          if (hsSelectInstance) hsSelectInstance.element.setValue(`${entities}`)
        } else el.value = `${entities}`
      })

    this.dataTable.page.len(entities).draw()
  }

  // Info
  private initInfo() {
    this.infoList.forEach(el => {
      this.initInfoFrom(el)
      this.initInfoTo(el)
      this.initInfoLength(el)
    })
  }

  private initInfoFrom(el: HTMLElement) {
    const infoFrom = (el.querySelector('[data-datatable-info-from]') as HTMLElement) ?? null
    const { start } = this.dataTable.page.info()

    if (infoFrom) infoFrom.innerText = `${start + 1}`
  }

  private initInfoTo(el: HTMLElement) {
    const infoTo = (el.querySelector('[data-datatable-info-to]') as HTMLElement) ?? null
    const { end } = this.dataTable.page.info()

    if (infoTo) infoTo.innerText = `${end}`
  }

  private initInfoLength(el: HTMLElement) {
    const infoLength = (el.querySelector('[data-datatable-info-length]') as HTMLElement) ?? null
    const { recordsTotal } = this.dataTable.page.info()

    if (infoLength) infoLength.innerText = `${recordsTotal}`
  }

  private updateInfo() {
    this.initInfo()
  }

  // Paging
  private initPaging() {
    this.pagingList.forEach(el => this.hidePagingIfSinglePage(el))
  }

  private hidePagingIfSinglePage(el: HTMLElement) {
    const { pages } = this.dataTable.page.info()

    if (pages < 2) {
      el.classList.add('hidden')
      el.style.display = 'none'
    } else {
      el.classList.remove('hidden')
      el.style.display = ''
    }
  }

  private initPagingPrev() {
    this.pagingPrevList.forEach(el => {
      this.onPagingPrevClickListener.push({
        el,
        fn: () => this.pagingPrevClick()
      })

      el.addEventListener('click', this.onPagingPrevClickListener.find(pagingPrev => pagingPrev.el === el).fn)
    })
  }

  private onPrevClick() {
    this.dataTable.page('previous').draw('page')
  }

  private disablePagingArrow(el: HTMLElement, statement: boolean) {
    if (statement) {
      el.classList.add('disabled')
      el.setAttribute('disabled', 'disabled')
    } else {
      el.classList.remove('disabled')
      el.removeAttribute('disabled')
    }
  }

  private initPagingNext() {
    this.pagingNextList.forEach(el => {
      this.onPagingNextClickListener.push({
        el,
        fn: () => this.pagingNextClick()
      })

      el.addEventListener('click', this.onPagingNextClickListener.find(pagingNext => pagingNext.el === el).fn)
    })
  }

  private onNextClick() {
    this.dataTable.page('next').draw('page')
  }

  private buildPagingPages() {
    this.pagingPagesList.forEach(el => this.updatePaging(el))
  }

  private updatePaging(pagingPages: HTMLElement) {
    const { page, pages, length } = this.dataTable.page.info()
    const totalRecords = this.dataTable.rows({ search: 'applied' }).count()
    const totalPages = Math.ceil(totalRecords / length)
    const currentPage = page + 1

    let startPage = Math.max(1, currentPage - Math.floor(this.maxPagesToShow / 2))
    let endPage = Math.min(totalPages, startPage + (this.maxPagesToShow - 1))

    if (endPage - startPage + 1 < this.maxPagesToShow) {
      startPage = Math.max(1, endPage - this.maxPagesToShow + 1)
    }

    pagingPages.innerHTML = ''

    if (startPage > 1) {
      this.buildPagingPage(1, pagingPages)

      if (startPage > 2) pagingPages.appendChild(htmlToElement(`<span class="ellipsis">...</span>`))
    }

    for (let i = startPage; i <= endPage; i++) {
      this.buildPagingPage(i, pagingPages)
    }

    if (endPage < totalPages) {
      if (endPage < totalPages - 1) pagingPages.appendChild(htmlToElement(`<span class="ellipsis">...</span>`))

      this.buildPagingPage(totalPages, pagingPages)
    }

    this.pagingPrevList.forEach(el => this.disablePagingArrow(el, page === 0))
    this.pagingNextList.forEach(el => this.disablePagingArrow(el, page === pages - 1))

    this.pagingList.forEach(el => this.hidePagingIfSinglePage(el))
  }

  private buildPagingPage(counter: number, target: HTMLElement) {
    const { page } = this.dataTable.page.info()
    const pageEl = htmlToElement(`<button type="button"></button>`)
    pageEl.innerText = `${counter}`
    pageEl.setAttribute('data-page', `${counter}`)
    if (this.pageBtnClasses) classToClassList(this.pageBtnClasses, pageEl)
    if (page === counter - 1) pageEl.classList.add('active')

    this.onSinglePagingClickListener.push({
      el: pageEl,
      fn: () => this.singlePagingClick(counter)
    })

    pageEl.addEventListener(
      'click',
      this.onSinglePagingClickListener.find(singlePaging => singlePaging.el === pageEl).fn
    )

    target.append(pageEl)
  }

  private onPageClick(counter: number) {
    this.dataTable.page(counter - 1).draw('page')
  }

  // Select row
  private initRowSelecting() {
    this.onRowSelectingAllChangeListener = () => this.rowSelectingAllChange()

    this.rowSelectingAll.addEventListener('change', this.onRowSelectingAllChangeListener)
  }

  private triggerChangeEventToRow() {
    this.table.querySelectorAll(`tbody ${this.rowSelectingIndividual}`).forEach(el => {
      el.addEventListener('change', () => {
        this.updateSelectAllCheckbox()
      })
    })
  }

  private onSelectAllChange() {
    let isChecked = (this.rowSelectingAll as HTMLInputElement).checked
    const visibleRows = Array.from(this.dataTable.rows({ page: 'current', search: 'applied' }).nodes())

    visibleRows.forEach(el => {
      const checkbox = el.querySelector(this.rowSelectingIndividual)

      if (checkbox) checkbox.checked = isChecked
    })

    this.updateSelectAllCheckbox()
  }

  private updateSelectAllCheckbox() {
    const searchRelatedItems = this.dataTable.rows({ search: 'applied' }).count()

    if (!searchRelatedItems) {
      ;(this.rowSelectingAll as HTMLInputElement).checked = false

      return false
    }

    let isChecked = true
    const visibleRows = Array.from(
      this.dataTable
        .rows({
          page: 'current',
          search: 'applied'
        })
        .nodes()
    )

    visibleRows.forEach(el => {
      const checkbox = el.querySelector(this.rowSelectingIndividual)

      if (checkbox && !checkbox.checked) {
        isChecked = false

        return false
      }
    })
    ;(this.rowSelectingAll as HTMLInputElement).checked = isChecked
  }

  // Public methods
  public destroy() {
    if (this.searches) {
      this.onSearchInputListener.forEach(({ el, fn }) => el.removeEventListener('click', fn))

      // this.searches = null;
    }
    if (this.pageEntitiesList)
      this.onPageEntitiesChangeListener.forEach(({ el, fn }) => el.removeEventListener('change', fn))
    if (this.pagingPagesList.length) {
      this.onSinglePagingClickListener.forEach(({ el, fn }) => el.removeEventListener('click', fn))

      this.pagingPagesList.forEach(el => (el.innerHTML = ''))
    }
    if (this.pagingPrevList.length)
      this.onPagingPrevClickListener.forEach(({ el, fn }) => el.removeEventListener('click', fn))
    if (this.pagingNextList.length)
      this.onPagingNextClickListener.forEach(({ el, fn }) => el.removeEventListener('click', fn))
    if (this.rowSelectingAll) this.rowSelectingAll.removeEventListener('change', this.onRowSelectingAllChangeListener)

    this.dataTable.destroy()

    this.rowSelectingAll = null
    this.rowSelectingIndividual = null

    window.$hsDataTableCollection = window.$hsDataTableCollection.filter(({ element }) => element.el !== this.el)
  }

  // Static methods
  static getInstance(target: HTMLElement | string, isInstance?: boolean) {
    const elInCollection = window.$hsDataTableCollection.find(
      el => el.element.el === (typeof target === 'string' ? document.querySelector(target) : target)
    )

    return elInCollection ? (isInstance ? elInCollection : elInCollection.element.el) : null
  }

  static autoInit() {
    if (!window.$hsDataTableCollection) window.$hsDataTableCollection = []

    if (window.$hsDataTableCollection)
      window.$hsDataTableCollection = window.$hsDataTableCollection.filter(({ element }) =>
        document.contains(element.el)
      )

    document.querySelectorAll('[data-datatable]:not(.--prevent-on-load-init)').forEach((el: HTMLElement) => {
      if (!window.$hsDataTableCollection.find(elC => (elC?.element?.el as HTMLElement) === el)) new HSDataTable(el)
    })
  }
}

declare global {
  interface Window {
    HSDataTable: Function
    $hsDataTableCollection: ICollectionItem<HSDataTable>[]
  }
}

window.addEventListener('load', () => {
  if (document.querySelectorAll('[data-datatable]:not(.--prevent-on-load-init)').length) {
    if (typeof jQuery === 'undefined') console.error('HSDataTable: jQuery is not available, please add it to the page.')
    if (typeof DataTable === 'undefined')
      console.error('HSDataTable: DataTable is not available, please add it to the page.')
  }

  if (typeof DataTable !== 'undefined' && typeof jQuery !== 'undefined') HSDataTable.autoInit()

  // Uncomment for debug
  // console.log('Datatable collection:', window.$hsDataTableCollection);
})

if (typeof window !== 'undefined') {
  window.HSDataTable = HSDataTable
}

export default HSDataTable