import { createContext, useContext } from 'react'
import pick from 'lodash/pick'

import type { BreadcrumbT } from 'components/Breadcrumbs'
import type { FeatureFlags } from 'components/hooks/useFeatureFlags'

type ProductT = {
  external: boolean
  href: string
  id: string
  name: string
  versions?: Array<string>
}

type LanguageItem = {
  name: string
  nativeName: string
  code: string
  hreflang: string
  wip?: boolean
}

type VersionItem = {
  version: string
  versionTitle: string
}

type Article = {
  href: string
  title: string
  shortTitle?: string
  hidden?: boolean
}
type ProductSiteTree = {
  title: string
  href: string
  external?: boolean
  categories?: Record<
    string,
    Article & {
      standalone?: boolean
      articles?: Record<string, Article>
      maptopics?: Record<string, Article & { articles?: Record<string, Article> }>
    }
  >
}

export type SiteTreePage = {
  page: {
    hidden?: boolean
    documentType: 'article' | 'mapTopic'
    title: string
  }
  renderedShortTitle?: string
  renderedFullTitle: string
  href: string
  childPages: Array<SiteTreePage>
}

type DataT = {
  ui: Record<string, any>
  reusables: {
    enterprise_deprecation: {
      version_was_deprecated: string
      version_will_be_deprecated: string
      deprecation_details: string
      isOldestReleaseDeprecated: boolean
    }
    policies: {
      translation: string
    }
  }
  variables: {
    release_candidate: { version: string }
  }
}
type EnterpriseServerReleases = {
  isOldestReleaseDeprecated: boolean
  oldestSupported: string
  nextDeprecationDate: string
}
export type MainContextT = {
  breadcrumbs: {
    product: BreadcrumbT
    category?: BreadcrumbT
    maptopic?: BreadcrumbT
    article?: BreadcrumbT
  }
  builtAssets: { main: { css: string; js: string } }
  expose: string
  activeProducts: Array<ProductT>
  currentProduct: ProductT
  currentLayoutName: string
  data: DataT
  airGap?: boolean
  error: string
  currentCategory?: string
  relativePath?: string
  enterpriseServerReleases: EnterpriseServerReleases
  currentLanguage: string
  languages: Record<string, LanguageItem>
  allVersions: Record<string, VersionItem>
  productSiteTree?: ProductSiteTree
  productSiteTreeNew?: SiteTreePage
  featureFlags: FeatureFlags
  pageHidden: boolean
  pagePermalinks?: Array<{
    languageCode: string
    relativePath: string
    title: string
    pageVersionTitle: string
    pageVersion: string
    href: string
  }>
  enterpriseServerVersions: Array<string>
}

export const getMainContextFromRequest = (req: any): MainContextT => {
  return {
    builtAssets: req.context.builtAssets,
    expose: req.context.expose,
    breadcrumbs: req.context.breadcrumbs || {},
    activeProducts: req.context.activeProducts,
    currentProduct: req.context.productMap[req.context.currentProduct],
    currentLayoutName: req.context.currentLayoutName,
    error: req.context.error || '',
    data: {
      ui: req.context.site.data.ui,
      reusables: {
        enterprise_deprecation: req.context.site.data.reusables.enterprise_deprecation,
        policies: req.context.site.data.reusables.policies,
      },
      variables: {
        release_candidate: req.context.site.data.variables.release_candidate,
      },
    },
    airGap: req.context.AIRGAP || false,
    currentCategory: req.context.currentCategory || '',
    relativePath: req.context.page?.relativePath,
    pagePermalinks: req.context.page?.permalinks.map((obj: any) =>
      pick(obj, [
        'title',
        'pageVersionTitle',
        'pageVersion',
        'href',
        'relativePath',
        'languageCode',
      ])
    ),
    pageHidden: req.context.page.hidden || false,
    enterpriseServerReleases: JSON.parse(JSON.stringify(req.context.enterpriseServerReleases)),
    enterpriseServerVersions: req.context.enterpriseServerVersions,
    currentLanguage: req.context.currentLanguage,
    languages: Object.fromEntries(
      Object.entries(req.context.languages).map(([key, entry]: any) => {
        return [
          key,
          {
            name: entry.name,
            nativeName: entry.nativeName || '',
            code: entry.code,
            hreflang: entry.hreflang,
          },
        ]
      })
    ),
    allVersions: req.context.allVersions,
    // this gets rid of some `undefined` values, which is necessary so next.js can serialize the data
    productSiteTree: !req.context.FEATURE_NEW_SITETREE
      ? JSON.parse(
          JSON.stringify(
            req.context.siteTree[req.context.currentLanguage][req.context.currentVersion].products[
              req.context.currentProduct
            ]
          )
        )
      : null,
    productSiteTreeNew: req.context.FEATURE_NEW_SITETREE ? req.context.siteTree : null,
    featureFlags: {
      FEATURE_NEW_SITETREE: req.context.FEATURE_NEW_SITETREE || false,
    },
  }
}

export const MainContext = createContext<MainContextT | null>(null)

export const useMainContext = (): MainContextT => {
  const context = useContext(MainContext)

  if (!context) {
    throw new Error('"useMainContext" may only be used inside "MainContext.Provider"')
  }

  return context
}