import * as Mppx from 'mppx'

import * as Mpp from '../Mpp.js'
import * as Policy from './Policy.js'
import * as ScreenManager from './ScreenManager.js'

/** Maps an MPPX failure to the public relay error contract. */
export function map(cause: unknown): Mpp.RelayError {
  const message = cause instanceof Error ? cause.message : undefined

  switch (true) {
    case cause instanceof ScreenManager.RejectedError:
      return error(Mpp.relayErrorCode.screenRejected, 'Address screening rejected the payment.')
    case cause instanceof Policy.UnsupportedChainError:
    case cause instanceof Mppx.Errors.PaymentMethodUnsupportedError:
      return error(Mpp.relayErrorCode.unsupported, message)
    case cause instanceof Policy.PolicyDeniedError:
      return error(Mpp.relayErrorCode.policyDenied, message)
    case cause instanceof Mppx.Errors.PaymentExpiredError:
      return error(Mpp.relayErrorCode.expired, message)
    case cause instanceof Mppx.Errors.InsufficientBalanceError:
    case cause instanceof Mppx.Errors.PaymentInsufficientError:
      return error(Mpp.relayErrorCode.insufficientFunds, message)
    case cause instanceof Mppx.Errors.InvalidChallengeError:
    case cause instanceof Mppx.Errors.VerificationFailedError:
      return error(
        /\balready (?:been )?used\b/i.test(message ?? '')
          ? Mpp.relayErrorCode.alreadyUsed
          : Mpp.relayErrorCode.invalidPayment,
        message,
      )
    case cause instanceof Mppx.Errors.InvalidPayloadError:
    case cause instanceof Mppx.Errors.InvalidSignatureError:
    case cause instanceof Mppx.Errors.MalformedCredentialError:
      return error(Mpp.relayErrorCode.invalidPayment, message)
    case message?.toLowerCase().includes('simulation'):
      return error(Mpp.relayErrorCode.simulationFailed, message)
    case message?.toLowerCase().includes('broadcast'):
      return error(Mpp.relayErrorCode.broadcastFailed, message)
    default:
      return error(Mpp.relayErrorCode.unknown, message)
  }
}

function error(code: Mpp.RelayErrorCode, message: string | undefined): Mpp.RelayError {
  return message === undefined ? { code } : { code, message }
}