import { metrics } from "@opentelemetry/api"

import { Lang } from "@/constants/languages"
import * as api from "@/lib/api"
import { GetRewards } from "@/lib/graphql/Query/Rewards.graphql"
import { request } from "@/lib/graphql/request"
import { Context } from "@/server/context"
import { notFound } from "@/server/errors/trpc"
import {
  contentStackBaseWithProfileServiceProcedure,
  contentStackBaseWithProtectedProcedure,
  router,
} from "@/server/trpc"

import { generateLoyaltyConfigTag } from "@/utils/generateTag"

import { getAllLoyaltyLevels, getLoyaltyLevel } from "../loyaltyLevel/query"
import {
  rewardsAllInput,
  rewardsByLevelInput,
  rewardsCurrentInput,
} from "./input"
import {
  CmsRewardsResponse,
  Reward,
  validateApiRewardSchema,
  validateApiTierRewardsSchema,
  validateCmsRewardsSchema,
} from "./output"

const meter = metrics.getMeter("trpc.reward")
// OpenTelemetry metrics: Reward

const getCurrentRewardCounter = meter.createCounter(
  "trpc.contentstack.reward.current"
)
const getCurrentRewardSuccessCounter = meter.createCounter(
  "trpc.contentstack.reward.current-success"
)

const getCurrentRewardFailCounter = meter.createCounter(
  "trpc.contentstack.reward.current-fail"
)

const getByLevelRewardCounter = meter.createCounter(
  "trpc.contentstack.reward.byLevel"
)
const getByLevelRewardSuccessCounter = meter.createCounter(
  "trpc.contentstack.reward.byLevel-success"
)

const getByLevelRewardFailCounter = meter.createCounter(
  "trpc.contentstack.reward.byLevel-fail"
)

const getAllRewardCounter = meter.createCounter("trpc.contentstack.reward.all")

const getAllRewardSuccessCounter = meter.createCounter(
  "trpc.contentstack.reward.all-success"
)
const getAllRewardFailCounter = meter.createCounter(
  "trpc.contentstack.reward.all-fail"
)

function getUniqueRewardIds(rewardIds: string[]) {
  const uniqueRewardIds = new Set(rewardIds)
  return Array.from(uniqueRewardIds)
}

async function getAllApiRewards(ctx: Context & { serviceToken: string }) {
  const apiResponse = await api.get(api.endpoints.v1.tierRewards, {
    cache: undefined, // override defaultOptions
    headers: {
      Authorization: `Bearer ${ctx.serviceToken}`,
    },
    // One hour. Since the service token is refreshed every hour, this is the longest cache we can have.
    next: { revalidate: 60 * 60 },
  })

  if (!apiResponse.ok) {
    const text = await apiResponse.text()
    getCurrentRewardFailCounter.add(1, {
      error_type: "http_error",
      error: JSON.stringify({
        status: apiResponse.status,
        statusText: apiResponse.statusText,
        text,
      }),
    })
    console.error(
      "api.rewards.tierRewards error ",
      JSON.stringify({
        error: {
          status: apiResponse.status,
          statusText: apiResponse.statusText,
          text,
        },
      })
    )
  }

  const data = await apiResponse.json()
  const validatedApiTierRewards = validateApiTierRewardsSchema.safeParse(data)

  if (!validatedApiTierRewards.success) {
    getAllRewardFailCounter.add(1, {
      error_type: "validation_error",
      error: JSON.stringify(validatedApiTierRewards.error),
    })
    console.error(validatedApiTierRewards.error)
    console.error(
      "api.rewards validation error",
      JSON.stringify({
        error: validatedApiTierRewards.error,
      })
    )
    return null
  }

  return validatedApiTierRewards.data
}

async function getCmsRewards(locale: Lang, rewardIds: string[]) {
  const tags = rewardIds.map((id) =>
    generateLoyaltyConfigTag(locale, "reward", id)
  )

  const cmsRewardsResponse = await request<CmsRewardsResponse>(
    GetRewards,
    {
      locale: locale,
      rewardIds,
    },
    { next: { tags }, cache: "force-cache" }
  )

  if (!cmsRewardsResponse.data) {
    getAllRewardFailCounter.add(1, {
      lang: locale,
      error_type: "validation_error",
      error: JSON.stringify(cmsRewardsResponse.data),
    })
    const notFoundError = notFound(cmsRewardsResponse)
    console.error(
      "contentstack.rewards not found error",
      JSON.stringify({
        query: {
          locale,
          rewardIds,
        },
        error: { code: notFoundError.code },
      })
    )
    throw notFoundError
  }

  const validatedCmsRewards =
    validateCmsRewardsSchema.safeParse(cmsRewardsResponse)

  if (!validatedCmsRewards.success) {
    getAllRewardFailCounter.add(1, {
      locale,
      rewardIds,
      error_type: "validation_error",
      error: JSON.stringify(validatedCmsRewards.error),
    })
    console.error(validatedCmsRewards.error)
    console.error(
      "contentstack.rewards validation error",
      JSON.stringify({
        query: { locale, rewardIds },
        error: validatedCmsRewards.error,
      })
    )
    return null
  }

  return validatedCmsRewards.data
}

export const rewardQueryRouter = router({
  current: contentStackBaseWithProtectedProcedure
    .input(rewardsCurrentInput)
    .query(async function ({ input, ctx }) {
      getCurrentRewardCounter.add(1)

      const { limit, cursor } = input

      const apiResponse = await api.get(api.endpoints.v1.rewards, {
        cache: undefined, // override defaultOptions
        headers: {
          Authorization: `Bearer ${ctx.session.token.access_token}`,
        },
        next: { revalidate: 60 * 60 },
      })

      if (!apiResponse.ok) {
        const text = await apiResponse.text()
        getCurrentRewardFailCounter.add(1, {
          error_type: "http_error",
          error: JSON.stringify({
            status: apiResponse.status,
            statusText: apiResponse.statusText,
            text,
          }),
        })
        console.error(
          "api.reward error ",
          JSON.stringify({
            error: {
              status: apiResponse.status,
              statusText: apiResponse.statusText,
              text,
            },
          })
        )
        return null
      }

      const data = await apiResponse.json()

      const validatedApiRewards = validateApiRewardSchema.safeParse(data)

      if (!validatedApiRewards.success) {
        getCurrentRewardFailCounter.add(1, {
          locale: ctx.lang,
          error_type: "validation_error",
          error: JSON.stringify(validatedApiRewards.error),
        })
        console.error(validatedApiRewards.error)
        console.error(
          "contentstack.rewards validation error",
          JSON.stringify({
            query: { locale: ctx.lang },
            error: validatedApiRewards.error,
          })
        )
        return null
      }

      const rewardIds = validatedApiRewards.data.data
        .map((reward) => reward?.rewardId)
        .filter(Boolean)
        .sort() as string[]

      const slicedData = rewardIds.slice(cursor, limit + cursor)

      const cmsRewards = await getCmsRewards(ctx.lang, slicedData)

      if (!cmsRewards) {
        return null
      }

      const nextCursor =
        limit + cursor < rewardIds.length ? limit + cursor : undefined

      getCurrentRewardSuccessCounter.add(1)
      return {
        rewards: cmsRewards,
        nextCursor,
      }
    }),
  byLevel: contentStackBaseWithProfileServiceProcedure
    .input(rewardsByLevelInput)
    .query(async function ({ input, ctx }) {
      getByLevelRewardCounter.add(1)
      const { level_id } = input

      const allUpcomingApiRewards = await getAllApiRewards(ctx)

      if (!allUpcomingApiRewards || !allUpcomingApiRewards[level_id]) {
        getByLevelRewardFailCounter.add(1)

        return null
      }

      let apiRewards = allUpcomingApiRewards[level_id]!

      if (input.unique) {
        apiRewards = allUpcomingApiRewards[level_id]!.filter(
          (reward) => reward?.rewardTierLevel === level_id
        )
      }

      const rewardIds = apiRewards
        .map((reward) => reward?.rewardId)
        .filter((id): id is string => Boolean(id))

      const contentStackRewards = await getCmsRewards(ctx.lang, rewardIds)
      if (!contentStackRewards) {
        return null
      }

      const loyaltyLevelsConfig = await getLoyaltyLevel(ctx, input.level_id)

      const levelsWithRewards = apiRewards
        .map((reward) => {
          const contentStackReward = contentStackRewards.find((r) => {
            return r.reward_id === reward?.rewardId
          })

          if (contentStackReward) {
            return contentStackReward
          } else {
            console.error("No contentStackReward found", reward?.rewardId)
          }
        })
        .filter((reward): reward is Reward => Boolean(reward))

      getByLevelRewardSuccessCounter.add(1)
      return { level: loyaltyLevelsConfig, rewards: levelsWithRewards }
    }),
  all: contentStackBaseWithProfileServiceProcedure
    .input(rewardsAllInput)
    .query(async function ({ input, ctx }) {
      getAllRewardCounter.add(1)
      const allApiRewards = await getAllApiRewards(ctx)

      if (!allApiRewards) {
        return []
      }

      const rewardIds = Object.values(allApiRewards)
        .flatMap((level) => level.map((reward) => reward?.rewardId))
        .filter((id): id is string => Boolean(id))

      const contentStackRewards = await getCmsRewards(
        ctx.lang,
        getUniqueRewardIds(rewardIds)
      )

      if (!contentStackRewards) {
        return []
      }

      const loyaltyLevelsConfig = await getAllLoyaltyLevels(ctx)
      const levelsWithRewards = Object.entries(allApiRewards).map(
        ([level, rewards]) => {
          const combinedRewards = rewards
            .filter((r) => (input.unique ? r?.rewardTierLevel === level : true))
            .map((reward) => {
              const contentStackReward = contentStackRewards.find((r) => {
                return r.reward_id === reward?.rewardId
              })

              if (contentStackReward) {
                return contentStackReward
              } else {
                console.error("No contentStackReward found", reward?.rewardId)
              }
            })
            .filter((reward): reward is Reward => Boolean(reward))

          const levelConfig = loyaltyLevelsConfig.find(
            (l) => l.level_id === level
          )

          if (!levelConfig) {
            getAllRewardFailCounter.add(1)

            console.error("contentstack.loyaltyLevels level not found")
            throw notFound()
          }
          return { ...levelConfig, rewards: combinedRewards }
        }
      )

      getAllRewardSuccessCounter.add(1)
      return levelsWithRewards
    }),
})