import { cache } from "react"

import {
  type MembershipLevel,
  MembershipLevelEnum,
} from "@scandic-hotels/common/constants/membershipLevels"
import { createCounter } from "@scandic-hotels/common/telemetry"

import { router } from "../../.."
import { notFoundError } from "../../../errors"
import {
  GetAllLoyaltyLevels,
  GetLoyaltyLevel,
} from "../../../graphql/Query/LoyaltyLevels.graphql"
import { request } from "../../../graphql/request"
import { contentstackBaseProcedure } from "../../../procedures"
import { generateLoyaltyConfigTag } from "../../../utils/generateTag"
import { loyaltyLevelInput } from "./input"
import {
  type LoyaltyLevel,
  type LoyaltyLevelsResponse,
  validateLoyaltyLevelsSchema,
} from "./output"

import type { Lang } from "@scandic-hotels/common/constants/language"

export const getAllLoyaltyLevels = cache(async (lang: Lang) => {
  const getLoyaltyLevelAllCounter = createCounter(
    "trpc.contentstack.loyaltyLevel.all"
  )
  const metricsGetLoyaltyLevelAll = getLoyaltyLevelAllCounter.init()

  metricsGetLoyaltyLevelAll.start()

  // Ideally we should fetch all available tiers from API, but since they
  // are static, we can just use the enum values. We want to know which
  // levels we are fetching so that we can use tags to cache them
  const allLevelIds = Object.values(MembershipLevelEnum)

  const tags = allLevelIds.map((levelId) =>
    generateLoyaltyConfigTag(lang, "loyalty_level", levelId)
  )

  const loyaltyLevelsConfigResponse = await request<LoyaltyLevelsResponse>(
    GetAllLoyaltyLevels,
    { lang, level_ids: allLevelIds },
    { key: tags, ttl: "max" }
  )

  if (!loyaltyLevelsConfigResponse.data) {
    metricsGetLoyaltyLevelAll.noDataError()

    throw notFoundError({
      message: "GetAllLoyaltyLevels returned no data",
      errorDetails: { lang, level_ids: allLevelIds },
    })
  }

  const validatedLoyaltyLevels = validateLoyaltyLevelsSchema.safeParse(
    loyaltyLevelsConfigResponse.data
  )
  if (!validatedLoyaltyLevels.success) {
    metricsGetLoyaltyLevelAll.validationError(validatedLoyaltyLevels.error)
    return []
  }

  metricsGetLoyaltyLevelAll.success()

  return validatedLoyaltyLevels.data
})

export const getLoyaltyLevel = cache(
  async (lang: Lang, level_id: MembershipLevel) => {
    const getLoyaltyLevelCounter = createCounter(
      "trpc.contentstack.loyaltyLevel.get"
    )
    const metricsGetLoyaltyLevel = getLoyaltyLevelCounter.init({
      lang,
      level_id,
    })

    metricsGetLoyaltyLevel.start()

    const loyaltyLevelsConfigResponse = await request<LoyaltyLevelsResponse>(
      GetLoyaltyLevel,
      { lang, level_id },
      {
        key: generateLoyaltyConfigTag(lang, "loyalty_level", level_id),
        ttl: "max",
      }
    )
    if (
      !loyaltyLevelsConfigResponse.data ||
      !loyaltyLevelsConfigResponse.data.all_loyalty_level.items.length
    ) {
      metricsGetLoyaltyLevel.noDataError()
      throw notFoundError({
        message: "GetLoyaltyLevel returned no data",
        errorDetails: { lang, level_id },
      })
    }

    const validatedLoyaltyLevels = validateLoyaltyLevelsSchema.safeParse(
      loyaltyLevelsConfigResponse.data
    )
    if (!validatedLoyaltyLevels.success) {
      metricsGetLoyaltyLevel.validationError(validatedLoyaltyLevels.error)
      return null
    }

    metricsGetLoyaltyLevel.success()

    const result: LoyaltyLevel = validatedLoyaltyLevels.data[0]
    return result
  }
)

export const loyaltyLevelQueryRouter = router({
  byLevel: contentstackBaseProcedure
    .input(loyaltyLevelInput)
    .query(async function ({ ctx, input }) {
      return getLoyaltyLevel(ctx.lang, input.level)
    }),
  all: contentstackBaseProcedure.query(async function ({ ctx }) {
    return getAllLoyaltyLevels(ctx.lang)
  }),
})