import * as Sentry from "@sentry/nextjs"
import { cookies } from "next/headers"
import { z } from "zod"

import * as api from "@scandic-hotels/trpc/api"
import { protectedProcedure } from "@scandic-hotels/trpc/procedures"
import { getUserSchema } from "@scandic-hotels/trpc/routers/user/output"
import { getVerifiedUser } from "@scandic-hotels/trpc/routers/user/utils"

import { FriendsMembershipLevels } from "@/constants/membershipLevels"

import type { FriendsTier } from "@scandic-hotels/trpc/types/user"

const matchedSchema = z.object({
  tierMatchState: z.enum(["matched"]),
  toLevel: z.enum(["L1", "L2", "L3", "L4", "L5", "L6", "L7"]),
})
const notMatchedSchema = z.object({
  tierMatchState: z.enum(["alreadyMatched", "notLinked", "error", "cached"]),
})

const outputSchema = z.union([matchedSchema, notMatchedSchema])

export const performLevelUpgrade = protectedProcedure
  .output(outputSchema)
  .mutation(async function ({ ctx }) {
    const cookieStore = await cookies()
    const sasTierMatch = cookieStore.get("sasTierMatch")
    if (sasTierMatch) {
      return { tierMatchState: "cached" }
    }

    const profile = await getVerifiedUser({ session: ctx.session })
    if (!profile || "error" in profile || !profile.data.membership) {
      return { tierMatchState: "error" }
    }
    const currentLevel = profile.data.membership.membershipLevel

    console.log("[SAS] tier match started")

    const apiResponse = await api.post(api.endpoints.v1.Profile.matchTier, {
      headers: {
        Authorization: `Bearer ${ctx.session.token.access_token}`,
      },
      body: {
        partner: "sas_eb",
        partnerSpecific: {},
      },
    })

    cookieStore.set("sasTierMatch", "true", {
      maxAge: 60 * 60 * 24,
      httpOnly: true,
    })

    const updated = apiResponse.status === 200
    if (updated) {
      console.log("[SAS] tier match complete - boosted")
      const result = await apiResponse.json()
      const user = getUserSchema.parse(result)

      if (!user.membership) {
        const tierMatchErrorNoMembershipMessage =
          "[SAS] tier match error - no membership"
        console.log(tierMatchErrorNoMembershipMessage)
        Sentry.captureException(new Error(tierMatchErrorNoMembershipMessage))
        return { tierMatchState: "error" }
      }

      const newLevel = user.membership.membershipLevel

      if (isHigherLevel(newLevel, currentLevel)) {
        return { tierMatchState: "matched", toLevel: newLevel }
      }
      return { tierMatchState: "alreadyMatched" }
    }

    const matchedNoChange = apiResponse.status === 204
    if (matchedNoChange) {
      console.log("[SAS] tier match complete - no change")
      return { tierMatchState: "alreadyMatched" }
    }

    const notLinked = apiResponse.status === 404
    if (notLinked) {
      const tierMatchErrorNotLinkedMessage =
        "[SAS] tier match error - not linked"
      console.warn(tierMatchErrorNotLinkedMessage)
      Sentry.captureMessage(tierMatchErrorNotLinkedMessage)
      return { tierMatchState: "notLinked" }
    }

    const tierMatchErrorMessage = `[SAS] tier match error with status code ${apiResponse.status} and response ${await apiResponse.text()}`
    console.error(tierMatchErrorMessage)
    Sentry.captureException(new Error(tierMatchErrorMessage))
    return { tierMatchState: "error" }
  })

function isHigherLevel(
  newLevel: FriendsTier,
  currentLevel: FriendsTier
): boolean {
  const currentIndex = FriendsMembershipLevels.indexOf(currentLevel)
  const newIndex = FriendsMembershipLevels.indexOf(newLevel)
  return newIndex > currentIndex
}