import React, { useMemo, useEffect, useState, useCallback, useRef } from 'react'
import { Container } from '@/components/shared'
import { Helmet } from 'react-helmet'
import { useLocalization } from '@/utils/hooks/useLocalization'
import { useParams, useLocation } from 'react-router-dom'
import ReportViewer, {
  Callbacks,
  RequestOptions,
} from 'devexpress-reporting-react/dx-report-viewer'
import { ajaxSetup } from '@devexpress/analytics-core/analytics-utils-native'
import { ZoomAutoBy } from 'devexpress-reporting/viewer/constants'
import { APP_NAME } from '@/constants/app.constant'
import { MODE_DARK } from '@/constants/theme.constant'
import { useStoreState } from '@/store'
import { createReportUrl } from './reportRouteParams'

const VIEWER_THEME_LINK_ID = 'devexpress-report-viewer-theme'
const VIEWER_DARK_OVERRIDES_ID = 'devexpress-report-viewer-dark-overrides'
const DEFAULT_REPORT_ZOOM = 1

const getViewerClassName = (isDarkMode: boolean) =>
  [
    'dx-viewport',
    'dx-device-desktop',
    'dx-device-generic',
    'dx-theme-generic',
    'dx-theme-generic-typography',
    isDarkMode ? 'dx-color-scheme-dark' : 'dx-color-scheme-light',
    'report-viewer-shell',
    isDarkMode ? 'report-viewer-shell-dark' : '',
  ]
    .filter(Boolean)
    .join(' ')

const loadViewerCss = (isDarkMode: boolean) => {
  const styles = [
    new URL('@devexpress/analytics-core/dist/css/dx-analytics.common.css', import.meta.url).href,
    new URL('devexpress-reporting/dist/css/dx-webdocumentviewer.css', import.meta.url).href,
  ]

  styles.forEach((href) => {
    if (document.querySelector(`link[href="${href}"]`)) return
    const link = document.createElement('link')
    link.rel = 'stylesheet'
    link.href = href
    document.head.appendChild(link)
  })

  const themeHref = isDarkMode
    ? new URL('@devexpress/analytics-core/dist/css/dx-analytics.dark.css', import.meta.url).href
    : new URL('@devexpress/analytics-core/dist/css/dx-analytics.light.css', import.meta.url).href

  let themeLink = document.getElementById(VIEWER_THEME_LINK_ID) as HTMLLinkElement | null
  if (!themeLink) {
    themeLink = document.createElement('link')
    themeLink.id = VIEWER_THEME_LINK_ID
    themeLink.rel = 'stylesheet'
    document.head.appendChild(themeLink)
  }
  if (themeLink.href !== themeHref) {
    themeLink.href = themeHref
  }

  if (!document.getElementById(VIEWER_DARK_OVERRIDES_ID)) {
    const style = document.createElement('style')
    style.id = VIEWER_DARK_OVERRIDES_ID
    style.textContent = `
      .report-viewer-shell {
        min-height: calc(100vh - 4rem);
      }

      .report-viewer-shell-dark {
        background: #111827;
        color: #e5e7eb;
      }

      .report-viewer-shell-dark .dxrd-preview,
      .report-viewer-shell-dark .dxrd-preview-wrapper,
      .report-viewer-shell-dark .dxrd-toolbar-wrapper,
      .report-viewer-shell-dark .dxrd-right-panel,
      .report-viewer-shell-dark .dxrd-search-wrapper {
        background-color: #111827;
      }
    `
    document.head.appendChild(style)
  }
}

const DevexpressReportViewer: React.FC = () => {
  const { translate } = useLocalization()
  const { report, listFormCode, id } = useParams<{
    report: string
    listFormCode: string
    id: string
  }>()
  const location = useLocation()
  const token = useStoreState((state) => state.auth.session.token)
  const themeMode = useStoreState((state) => state.theme.mode)
  const [isRequestAuthReady, setIsRequestAuthReady] = useState(false)
  const previewModelRef = useRef<any>(null)
  const isDarkMode = themeMode === MODE_DARK

  const getReportPreview = useCallback((eventOrModel?: any) => {
    const eventArgs = eventOrModel?.args
    const sender = eventOrModel?.sender
    const candidates = [
      eventArgs?.reportPreview,
      eventArgs?.ReportPreview,
      eventArgs?.previewModel?.reportPreview,
      eventOrModel?.reportPreview,
      eventOrModel?.ReportPreview,
      eventOrModel?.previewModel?.reportPreview,
      sender?.GetReportPreview?.(),
      sender?.previewModel?.reportPreview,
      previewModelRef.current,
    ]

    return candidates.find(
      (candidate) =>
        candidate &&
        ('zoom' in candidate ||
          'originalZoom' in candidate ||
          'autoFitBy' in candidate),
    )
  }, [])

  const setDefaultZoom = useCallback((eventOrModel?: any) => {
    const preview = getReportPreview(eventOrModel)
    if (!preview) return

    previewModelRef.current = preview
    preview.autoFitBy = ZoomAutoBy.None
    preview.originalZoom = DEFAULT_REPORT_ZOOM
    preview.zoom = DEFAULT_REPORT_ZOOM
  }, [getReportPreview])

  useEffect(() => {
    loadViewerCss(isDarkMode)
  }, [isDarkMode])

  useEffect(() => {
    setIsRequestAuthReady(false)
    const authorization = token ? `Bearer ${token}` : undefined

    const ajaxHeaders = ajaxSetup.ajaxSettings.headers ?? {}

    if (authorization) {
      ajaxSetup.ajaxSettings.headers = {
        ...ajaxHeaders,
        Authorization: authorization,
      }
      setIsRequestAuthReady(true)
      return
    }

    const { Authorization: _ajaxAuthorization, ...nextAjaxHeaders } = ajaxHeaders
    ajaxSetup.ajaxSettings.headers = nextAjaxHeaders
    setIsRequestAuthReady(true)
  }, [token])

  const reportUrlWithParams = useMemo(() => {
    return createReportUrl({ report, id, listFormCode }, location.search)
  }, [report, id, listFormCode, location.search])

  if (!reportUrlWithParams) return null

  return (
    <Container className={getViewerClassName(isDarkMode)}>
      <Helmet
        titleTemplate={`%s | ${APP_NAME}`}
        title={translate('::App.Reports')}
        defaultTitle={APP_NAME}
      />

      {isRequestAuthReady && (
        <ReportViewer reportUrl={reportUrlWithParams}>
          <Callbacks
            BeforeRender={setDefaultZoom}
            DocumentReady={setDefaultZoom}
          />
          <RequestOptions
            host={import.meta.env.VITE_API_URL}
            invokeAction="/DXXRDV"
          />
        </ReportViewer>
      )}
    </Container>
  )
}

export default DevexpressReportViewer