defmodule BearCli.ConfigTest do
  use ExUnit.Case, async: false

  alias BearCli.Config

  @nonexistent "/nonexistent/bear_cli_config.json"

  setup do
    old_issuer = System.get_env("BEAR_ISSUER")
    old_config = System.get_env("BEAR_CONFIG")

    on_exit(fn ->
      restore_env("BEAR_ISSUER", old_issuer)
      restore_env("BEAR_CONFIG", old_config)
    end)

    System.delete_env("BEAR_ISSUER")
    System.put_env("BEAR_CONFIG", @nonexistent)

    :ok
  end

  test "defaults to the built-in issuer when nothing else is set" do
    assert Config.resolve_issuer(nil) == "https://alterminal.com"
  end

  test "CLI flag takes precedence over everything" do
    System.put_env("BEAR_ISSUER", "https://env.example.com")
    assert Config.resolve_issuer("https://flag.example.com") == "https://flag.example.com"
  end

  test "BEAR_ISSUER env wins over config and default" do
    System.put_env("BEAR_ISSUER", "https://env.example.com")
    assert Config.resolve_issuer(nil) == "https://env.example.com"
  end

  test "config file issuer wins over default" do
    path = write_config(%{"issuer" => "https://config.example.com"})

    on_exit(fn -> File.rm(path) end)

    assert Config.resolve_issuer(nil, path) == "https://config.example.com"
  end

  test "config path override is honored" do
    path = write_config(%{"issuer" => "https://override.example.com"})

    on_exit(fn -> File.rm(path) end)

    assert Config.resolve_issuer(nil, path) == "https://override.example.com"
  end

  defp write_config(map) do
    path =
      Path.join(System.tmp_dir!(), "bear_cli_config_#{System.unique_integer([:positive])}.json")

    File.write!(path, Jason.encode!(map))
    path
  end

  defp restore_env(key, nil), do: System.delete_env(key)
  defp restore_env(key, value), do: System.put_env(key, value)
end