import { TRPCError } from "@trpc/server"
import { cookies, headers } from "next/headers"
import { redirect } from "next/navigation"

import { Lang } from "@scandic-hotels/common/constants/language"
import { login } from "@scandic-hotels/common/constants/routes/handleAuth"
import { createLogger } from "@scandic-hotels/common/logger/createLogger"
import { createContext } from "@scandic-hotels/trpc/context"
import { getBasicUser } from "@scandic-hotels/trpc/routers/user/utils/getBasicUser"
import { getVerifiedUser } from "@scandic-hotels/trpc/routers/user/utils/getVerifiedUser"
import {
  appServerClient,
  configureServerClient,
} from "@scandic-hotels/trpc/serverClient"
import { isValidSession } from "@scandic-hotels/trpc/utils/session"

import { webviews } from "@/constants/routes/webviews"

import { auth } from "@/auth"

import type { Session } from "next-auth"

export async function createAppContext() {
  const headersList = await headers()
  const cookie = await cookies()
  const webviewTokenCookie = cookie.get("webviewToken")
  const loginType = headersList.get("loginType")

  async function getUserSession(): Promise<Session | null> {
    const session = await auth()
    const webToken = webviewTokenCookie?.value
    if (!session?.token && !webToken) {
      return null
    }

    return (
      session ||
      ({
        token: { access_token: webToken, loginType },
      } as Session)
    )
  }

  const ctx = createContext({
    app: "scandic-web",
    lang: headersList.get("x-lang") as Lang,
    pathname: headersList.get("x-pathname")!,
    uid: headersList.get("x-uid"),
    url: headersList.get("x-url")!,
    webToken: webviewTokenCookie?.value,
    contentType: headersList.get("x-contenttype")!,
    auth: async () => await getUserSession(),
    getScandicUserToken: async () => {
      const session = await getUserSession()
      if (!isValidSession(session)) {
        return null
      }
      return session?.token?.access_token ?? null
    },
    getUserPointsBalance: async () => {
      const session = await getUserSession()
      if (!session) return null

      const user = await getVerifiedUser({
        token: {
          expires_at: session.token.expires_at ?? 0,
          access_token: session.token.access_token,
        },
      })

      if (!user) {
        return null
      }

      return user.membership?.currentPoints ?? 0
    },
    getScandicUser: async (input) => {
      const session = await getUserSession()
      if (!session) return null

      const user = await getVerifiedUser({
        token: {
          expires_at: session.token.expires_at ?? 0,
          access_token: session.token.access_token,
        },
        includeExtendedPartnerData: input?.withExtendedPartnerData,
      })

      return user ?? null
    },
    getScandicBasicUser: async () => {
      const session = await getUserSession()
      if (!session) return null

      const user = await getBasicUser({
        token: {
          expires_at: session.token.expires_at ?? 0,
          access_token: session.token.access_token,
        },
      })

      return user ?? null
    },
  })

  return ctx
}

configureServerClient(createAppContext)

const serverClientLogger = createLogger("serverClient")
export async function serverClient() {
  const ctx = await createAppContext()

  return appServerClient(ctx, {
    onError: ({ ctx, error }) => {
      if (error instanceof TRPCError) {
        if (error.code === "UNAUTHORIZED") {
          let lang = Lang.en
          let pathname = "/"
          let fullUrl = "/"

          if (ctx) {
            lang = ctx.lang
            pathname = ctx.pathname
            fullUrl = ctx.url
          }

          const fullPathname = new URL(fullUrl).pathname

          if (webviews.includes(fullPathname)) {
            const redirectUrl = `/${lang}/webview/refresh?returnurl=${encodeURIComponent(fullPathname)}`
            serverClientLogger.debug(
              "Unautorized in webview, redirecting to: ",
              redirectUrl
            )

            redirect(redirectUrl)
          }

          const redirectUrl = `${login[lang]}?redirectTo=${encodeURIComponent(`/${lang}/${pathname}`)}`
          serverClientLogger.debug(
            `[serverClient] onError redirecting to: ${redirectUrl}`
          )
          redirect(redirectUrl)
        }
      }
    },
  })
}