# nimpak/transactions.nim
# Atomic transaction management system

import std/[tables, strutils, json, times]
import ../nip/types

# Transaction management functions
proc beginTransaction*(): Transaction =
  ## Begin a new atomic transaction
  Transaction(
    id: "tx-" & $now().toUnix(),
    operations: @[],
    rollbackData: @[]
  )

proc addOperation*(tx: var Transaction, op: Operation) =
  ## Add an operation to the transaction
  tx.operations.add(op)

proc commitTransaction*(tx: Transaction): Result[void, string] =
  ## Commit all operations in the transaction
  # TODO: Implement actual filesystem operations
  echo "Committing transaction: " & tx.id
  for op in tx.operations:
    echo "  - " & $op.kind & ": " & op.target
  ok()

proc rollbackTransaction*(tx: Transaction): Result[void, string] =
  ## Rollback all operations in the transaction
  # TODO: Implement actual rollback operations
  echo "Rolling back transaction: " & tx.id
  for rollback in tx.rollbackData:
    echo "  - Rolling back: " & $rollback.operation.kind
  ok()