import { Region, Stack } from "contentstack"

import { env } from "@/env/server"

import {
  syncEntriesCounter,
  syncEntriesFailCounter,
  syncEntriesPaginationCounter,
  syncEntriesSuccessCounter,
} from "./telemetry"

import type { SyncResponse } from "@/types/sitemap"

const environment = env.CMS_ENVIRONMENT
const stack = Stack({
  api_key: env.CMS_API_KEY,
  delivery_token: env.CMS_ACCESS_TOKEN,
  branch: env.CMS_BRANCH,
  environment,
  region: Region.EU,
})

export async function contentstackSync(syncToken: string | null) {
  const entries = []
  const syncOptions = syncToken ? { sync_token: syncToken } : { init: true }

  syncEntriesCounter.add(1, {
    environment,
    ...syncOptions,
  })
  console.info(
    "sitemap.entries.sync start",
    JSON.stringify({
      environment,
      ...syncOptions,
    })
  )
  try {
    let syncResponse: SyncResponse = await stack.sync(syncOptions)

    entries.push(...syncResponse.items)

    // Check if there is a pagination token, and fetch more data if needed
    while (syncResponse.pagination_token && !syncResponse.sync_token) {
      syncEntriesPaginationCounter.add(1, {
        environment,
        paginationToken: syncResponse.pagination_token,
      })
      console.info(
        "sitemap.entries.sync.pagination start",
        JSON.stringify({
          environment,
          paginationToken: syncResponse.pagination_token,
        })
      )
      syncResponse = await stack.sync({
        pagination_token: syncResponse.pagination_token,
      })

      entries.push(...syncResponse.items)

      syncEntriesPaginationCounter.add(1, {
        environment,
        paginationToken: syncResponse.pagination_token,
        entriesCount: syncResponse.items.length,
      })
      console.info(
        "sitemap.entries.sync.pagination success",
        JSON.stringify({
          environment,
          paginationToken: syncResponse.pagination_token,
          entriesCount: syncResponse.items.length,
        })
      )
    }

    if (syncResponse.sync_token) {
      syncEntriesSuccessCounter.add(1, {
        environment,
        ...syncOptions,
        newSyncToken: syncResponse.sync_token,
        entriesCount: entries.length,
      })
      console.info(
        "sitemap.entries.sync success",
        JSON.stringify({
          environment,
          ...syncOptions,
          newSyncToken: syncResponse.sync_token,
          entriesCount: entries.length,
        })
      )
      return {
        syncToken: syncResponse.sync_token,
        entries,
      }
    } else {
      throw new Error("No sync token received, something went wrong")
    }
  } catch (error) {
    const errorMessage =
      error instanceof Error ? error.message : JSON.stringify(error)
    syncEntriesFailCounter.add(1, {
      environment,
      ...syncOptions,
      error: errorMessage,
    })
    console.error("sitemap.entries.sync error", errorMessage)

    throw new Error("Failed to sync entries")
  }
}