defmodule CliDataIoTest do
  use ExUnit.Case, async: false
  doctest Snapex7

  # We need to implement S7 Server behavior in order to make a proper tests.
  # these tests are done connected to a real PLC

  setup do
    snap7_dir = :code.priv_dir(:snapex7) |> List.to_string()
    System.put_env("LD_LIBRARY_PATH", snap7_dir)
    System.put_env("DYLD_LIBRARY_PATH", snap7_dir)
    executable = :code.priv_dir(:snapex7) ++ ~c"/s7_client.o"

    port =
      Port.open({:spawn_executable, executable}, [
        {:args, []},
        {:packet, 2},
        :use_stdio,
        :binary,
        :exit_status
      ])

    msg = {:connect_to, {"192.168.0.1", 0, 1}}
    send(port, {self(), {:command, :erlang.term_to_binary(msg)}})

    status =
      receive do
        {_, {:data, <<?r, response::binary>>}} ->
          :erlang.binary_to_term(response)
      after
        10000 ->
          :error
      end

    %{port: port, status: status}
  end

  test "handler_write_area/read_area (DB) test", state do
    case state.status do
      :ok ->
        msg = {:write_area, {0x84, 1, 2, 4, 2, <<0x42, 0xCB, 0x00, 0x00>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        # {Area, db_number, start, amount, word_len}
        msg = {:read_area, {0x84, 1, 2, 4, 2}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x42, 0xCB, 0x00, 0x00>>}

        msg = {:write_area, {0x84, 1, 2, 4, 2, <<0x42, 0xCA, 0x00, 0x00>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:read_area, {0x84, 1, 2, 4, 2}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x42, 0xCA, 0x00, 0x00>>}

      _ ->
        IO.puts("(#{__MODULE__}) Not connected")
    end
  end

  test "handler_db_write/db_read test", state do
    case state.status do
      :ok ->
        msg = {:db_write, {1, 2, 4, <<0x42, 0xCB, 0x00, 0x00>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:db_read, {1, 2, 4}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x42, 0xCB, 0x00, 0x00>>}

        msg = {:db_write, {1, 2, 4, <<0x42, 0xCA, 0x00, 0x00>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:db_read, {1, 2, 4}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x42, 0xCA, 0x00, 0x00>>}

      _ ->
        IO.puts("(#{__MODULE__}) Not connected")
    end
  end

  test "handler_ab_write/ab_read test", state do
    case state.status do
      :ok ->
        msg = {:ab_write, {0, 1, <<0x0F>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:ab_read, {0, 1}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x0F>>}
        Process.sleep(500)
        msg = {:ab_write, {0, 1, <<0x00>>}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:ab_read, {0, 1}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x00>>}

      _ ->
        IO.puts("(#{__MODULE__}) Not connected")
    end
  end

  # eb_write doesn't make sense...
  test "handler_eb_read test", state do
    case state.status do
      :ok ->
        msg = {:eb_read, {0, 1}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, <<0x08>>}

      _ ->
        IO.puts("(#{__MODULE__}) Not connected")
    end
  end

  test "handler_read/write_multi_vars test", state do
    case state.status do
      :ok ->
        # DB1
        data1 = %{
          area: 132,
          word_len: 2,
          db_number: 1,
          start: 2,
          amount: 4,
          data: <<0x42, 0xCB, 0x20, 0x10>>
        }

        # P0
        data2 = %{
          area: 130,
          word_len: 2,
          db_number: 1,
          start: 0,
          amount: 1,
          data: <<0x0F>>
        }

        # DB1
        data3 = %{
          area: 132,
          word_len: 2,
          db_number: 1,
          start: 2,
          amount: 4,
          data: <<0x42, 0xCA, 0x00, 0x00>>
        }

        # P0
        data4 = %{
          area: 130,
          word_len: 2,
          db_number: 1,
          start: 0,
          amount: 1,
          data: <<0x00>>
        }

        # DB1
        r_data1 = %{
          area: 132,
          word_len: 2,
          db_number: 1,
          start: 2,
          amount: 4
        }

        # P0
        r_data2 = %{
          area: 130,
          word_len: 2,
          db_number: 1,
          start: 0,
          amount: 1
        }

        # PE0
        r_data3 = %{
          area: 129,
          word_len: 2,
          db_number: 1,
          start: 0,
          amount: 1
        }

        msg = {:write_multi_vars, {2, [data1, data2]}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:read_multi_vars, {2, [r_data1, r_data2]}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, [<<0x42, 0xCB, 0x20, 0x10>>, <<0x0F>>]}

        msg = {:write_multi_vars, {2, [data3, data4]}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == :ok

        msg = {:read_multi_vars, {3, [r_data1, r_data2, r_data3]}}
        send(state.port, {self(), {:command, :erlang.term_to_binary(msg)}})

        c_response =
          receive do
            {_, {:data, <<?r, response::binary>>}} ->
              :erlang.binary_to_term(response)

            x ->
              IO.inspect(x)
              :error
          after
            1000 ->
              # Not sure how this can be recovered
              exit(:port_timed_out)
          end

        assert c_response == {:ok, [<<0x42, 0xCA, 0x00, 0x00>>, <<0x00>>, <<0x08>>]}

      _ ->
        IO.puts("(#{__MODULE__}) Not connected")
    end
  end
end