// SPDX-FileCopyrightText: © 2026 LEDGER SAS
// SPDX-License-Identifier: Apache-2.0

import type { Unit } from '@ledgerhq/coin-module-framework/api/types'
import type { Account as StellarSdkAccount } from '@stellar/stellar-sdk'
import {
  Operation as StellarSdkOperation,
  TransactionBuilder,
  Networks,
  Asset,
} from '@stellar/stellar-sdk'

export function buildTransactionBuilder(source: StellarSdkAccount, fee: bigint) {
  const formattedFee = fee.toString()
  return new TransactionBuilder(source, {
    fee: formattedFee,
    networkPassphrase: Networks.PUBLIC,
  })
}

export function buildChangeTrustOperation(assetCode: string, assetIssuer: string) {
  return StellarSdkOperation.changeTrust({
    asset: new Asset(assetCode, assetIssuer),
  })
}

export function buildCreateAccountOperation(unit: Unit, destination: string, amount: bigint) {
  const formattedAmount = getFormattedAmount(unit, amount)
  return StellarSdkOperation.createAccount({
    destination: destination,
    startingBalance: formattedAmount,
  })
}

export function buildPaymentOperation({
  unit,
  destination,
  amount,
  assetCode,
  assetIssuer,
}: {
  unit: Unit
  destination: string
  amount: bigint
  assetCode: string | undefined
  assetIssuer: string | undefined
}) {
  const formattedAmount = getFormattedAmount(unit, amount)
  // Non-native assets should always have asset code and asset issuer. If an
  // asset doesn't have both, we assume it is native asset.
  const asset = assetCode && assetIssuer ? new Asset(assetCode, assetIssuer) : Asset.native()
  return StellarSdkOperation.payment({
    destination: destination,
    amount: formattedAmount,
    asset,
  })
}

function getFormattedAmount(unit: Unit, amount: bigint) {
  const div = 10 ** unit.magnitude
  // BigInt division is always an integer, never a float. We need to convert first to a Number.
  return (Number(amount) / div).toString()
}