defmodule ProxmoxAgent.ShellTest do
  use ExUnit.Case, async: false

  alias ProxmoxAgent.Shell

  test "run/2 returns {:ok, output} on zero exit" do
    assert {:ok, output} = Shell.run("/bin/echo", ["hello"])
    assert String.trim(output) == "hello"
  end

  test "run/2 returns {:error, {:nonzero_exit, code, output}} on non-zero exit" do
    assert {:error, {:nonzero_exit, code, _}} = Shell.run("/bin/sh", ["-c", "exit 7"])
    assert code == 7
  end

  test "run/2 returns {:error, {:enoent, _}} when binary is missing" do
    assert {:error, {:enoent, _}} = Shell.run("/does/not/exist/nope", [])
  end

  test "run/2 logs to Diagnostics when dump_dir is set" do
    dir = Path.join(System.tmp_dir!(), "shell-dump-#{System.unique_integer([:positive])}")
    File.mkdir_p!(dir)
    :ok = ProxmoxAgent.Diagnostics.configure(dir)
    {:ok, writer} = ProxmoxAgent.Diagnostics.Writer.start_link(dir: dir)

    on_exit(fn ->
      if Process.alive?(writer), do: GenServer.stop(writer)
      Application.delete_env(:agent, :dump_dir)
      File.rm_rf(dir)
    end)

    assert {:ok, _} = Shell.run("/bin/echo", ["diagnostics-test"])
    :ok = GenServer.call(ProxmoxAgent.Diagnostics.Writer, :flush)

    body = File.read!(Path.join(dir, "commands.log"))
    assert body =~ "$ /bin/echo diagnostics-test"
    assert body =~ "exit=0"
    assert body =~ "diagnostics-test"
  end
end