// Copyright (C) 2012-2024 Zammad Foundation, https://zammad-foundation.org/

import { onError } from '@apollo/client/link/error'
import getErrorContext from '#shared/server/apollo/utils/getErrorContext.ts'
import log from '#shared/utils/log.ts'
import type { GraphQLErrorExtensionsHandler } from '#shared/types/error.ts'
import { GraphQLErrorTypes } from '#shared/types/error.ts'
import emitter from '#shared/utils/emitter.ts'
import { recordCommunicationFailure } from '#shared/server/connection.ts'

const errorLink = onError(({ graphQLErrors, networkError, operation }) => {
  const errorContext = getErrorContext(operation)

  const errorMessages: Array<string> = []

  if (graphQLErrors) {
    graphQLErrors.forEach(({ message, extensions, path }) => {
      const { type, backtrace }: GraphQLErrorExtensionsHandler = {
        type:
          (extensions?.type as GraphQLErrorTypes) ||
          GraphQLErrorTypes.NetworkError,
        backtrace: extensions?.backtrace as string,
      }

      errorMessages.push(
        `[GraphQL error - ${type}]: ${message}, Path: ${path}`,
        backtrace,
      )

      if (
        operation.operationName !== 'session' &&
        type === GraphQLErrorTypes.NotAuthorized
      ) {
        // Reset authenticated state after an unathenticated error type.
        emitter.emit('sessionInvalid')

        log.warn('Session invalid, trigger logout and show login page.')
      }
    })
  }

  if (networkError) {
    // Suppress error message in Capybara test context, as it can happen if the
    //  test session is reset to 'about:blank' while requests are still running.
    if (!VITE_TEST_MODE) errorMessages.push(`[Network error]: ${networkError}`)
    // Network error implies application connection problems.
    // TODO: what's missing here is a detection of web socket disconnects.
    recordCommunicationFailure()
  }

  if (errorContext.logLevel === 'silent') return

  log[errorContext.logLevel](...errorMessages)
})

export default errorLink