defmodule AshCommanded.Commanded.TransactionTest do
  use ExUnit.Case, async: false

  # Mock repository for testing
  defmodule MockRepo do
    def transaction(fun, _opts \\ []) do
      try do
        result = fun.()
        {:ok, result}
      rescue
        error -> 
          # Simulate transaction rollback
          {:error, error}
      end
    end

    def supports_transactions?, do: true
  end

  # Mock repository that doesn't support transactions
  defmodule NoTransactionRepo do
    def supports_transactions?, do: false
  end

  alias AshCommanded.Commanded.Transaction
  alias AshCommanded.Commanded.Error

  describe "transaction module" do
    test "run/3 executes function in transaction" do
      # Testing direct function execution in a transaction
      result = Transaction.run(MockRepo, fn -> {:ok, :transaction_success} end)
      assert result == {:ok, {:ok, :transaction_success}}
    end
    
    # Simple tests that don't require complex mocking
    test "create and handle error types" do
      error = Error.dispatch_error("Test error")
      assert is_struct(error, Error)
      assert error.message == "Test error"
      
      cmd_error = Error.command_error("Command failed")
      assert cmd_error.message == "Command failed"
    end
  end

  describe "multi-command execution" do
    test "conceptual test for multi-command transactions" do
      # This is a conceptual test for the multi-command transaction functionality
      # The actual implementation would depend on how the command execution is integrated
      
      # A simple function to represent command execution
      execute_command = fn name, _params -> {:ok, %{id: name}} end
      
      # Test executing multiple commands in a transaction
      result = Transaction.run(MockRepo, fn ->
        {:ok, order} = execute_command.("order-123", %{total: 100})
        {:ok, item} = execute_command.("item-456", %{order_id: order.id, quantity: 2})
        
        {:ok, %{order: order, item: item}}
      end)
      
      # Verify the transaction result contains both command results
      assert {:ok, {:ok, %{order: %{id: "order-123"}, item: %{id: "item-456"}}}} = result
    end
  end
end