defmodule Aprsme.IsTest do
  @moduledoc """
  Tests to ensure APRS-IS external connections are properly blocked in test environment.
  """
  use ExUnit.Case, async: false
  use Aprsme.DataCase

  describe "APRS-IS mock functionality" do
    setup do
      # Start the mock if not already running
      case GenServer.start_link(AprsIsMock, [], name: AprsIsMock) do
        {:ok, pid} ->
          on_exit(fn ->
            if Process.alive?(pid) do
              GenServer.stop(pid, :normal)
            end
          end)

          {:ok, mock_pid: pid}

        {:error, {:already_started, pid}} ->
          on_exit(fn ->
            if Process.alive?(pid) do
              GenServer.stop(pid, :normal)
            end
          end)

          {:ok, mock_pid: pid}
      end
    end

    test "mock should provide status without external connections", %{mock_pid: _pid} do
      status = AprsIsMock.get_status()

      assert status.connected == false
      assert status.server == "mock.aprs.test"
      assert status.port == 14_580
      assert status.login_id == "TEST"
      assert is_map(status.packet_stats)
    end

    test "mock should handle message sending safely", %{mock_pid: _pid} do
      # These should not attempt external connections
      assert AprsIsMock.send_message("test message") == :ok
      assert AprsIsMock.send_message("TEST", "DEST", "hello") == :ok
      assert AprsIsMock.set_filter("r/0/0/1") == :ok
      assert AprsIsMock.list_active_filters() == :ok
    end

    test "mock can simulate packet reception for testing", %{mock_pid: _pid} do
      # This allows tests to simulate receiving packets without external connections
      test_packet = %{
        sender: "TEST-1",
        destination: "APRS",
        path: ["WIDE1-1", "WIDE2-1"],
        data_type: :position,
        latitude: 33.0,
        longitude: -96.0
      }

      assert AprsIsMock.simulate_packet(test_packet) == :ok
    end

    test "mock can simulate connection state changes", %{mock_pid: _pid} do
      # Simulate connected state
      assert AprsIsMock.simulate_connection_state(true) == :ok
      status = AprsIsMock.get_status()
      assert status.connected == true
      assert status.connected_at != nil

      # Simulate disconnected state
      assert AprsIsMock.simulate_connection_state(false) == :ok
      status = AprsIsMock.get_status()
      assert status.connected == false
      assert status.connected_at == nil
    end
  end

  describe "network isolation verification" do
    test "no external network calls should be made during test runs" do
      # This test verifies that no actual TCP connections are attempted
      # We can do this by checking that :gen_tcp.connect is not called
      # with real APRS server addresses

      # Common APRS-IS servers that should never be contacted in tests
      forbidden_servers = [
        "rotate.aprs2.net",
        "dallas.aprs2.net",
        "seattle.aprs2.net",
        "chicago.aprs2.net",
        "atlanta.aprs2.net"
      ]

      # Verify these are not in the current configuration
      current_server = Application.get_env(:aprsme, :aprsme_is_server)

      if current_server do
        server_str = to_string(current_server)

        refute Enum.any?(forbidden_servers, fn forbidden ->
                 String.contains?(server_str, forbidden)
               end),
               "Test environment should not be configured with real APRS servers"
      end
    end

    test "test environment marker is properly set" do
      # Verify we're definitely in test environment
      assert Mix.env() == :test
      assert Application.get_env(:aprsme, :env) == :test
    end
  end
end