defmodule Microwaveprop.Radio.TextSanitizerTest do
  use ExUnit.Case, async: true

  alias Microwaveprop.Radio.TextSanitizer

  describe "sanitize/1" do
    test "passes through plain ASCII unchanged" do
      assert TextSanitizer.sanitize("K5ABC EM12 1296") == "K5ABC EM12 1296"
    end

    test "preserves CR, LF, and TAB" do
      assert TextSanitizer.sanitize("a\nb\r\nc\td") == "a\nb\r\nc\td"
    end

    test "replaces NBSP (U+00A0) with regular space" do
      assert TextSanitizer.sanitize("K5ABC\u00A0EM12") == "K5ABC EM12"
    end

    test "replaces narrow no-break space (U+202F) and figure space (U+2007) with space" do
      assert TextSanitizer.sanitize("a\u202Fb\u2007c") == "a b c"
    end

    test "replaces all unicode general-punctuation spaces (U+2000–U+200A) with space" do
      assert TextSanitizer.sanitize("a\u2000b\u2003c\u200Ad") == "a b c d"
    end

    test "strips BOM (U+FEFF) anywhere in the string" do
      assert TextSanitizer.sanitize("\uFEFFK5ABC") == "K5ABC"
      assert TextSanitizer.sanitize("K5\uFEFFABC") == "K5ABC"
    end

    test "strips zero-width joiners and non-joiners" do
      assert TextSanitizer.sanitize("K5\u200BABC\u200C\u200D") == "K5ABC"
    end

    test "strips C0 control characters except TAB/CR/LF" do
      assert TextSanitizer.sanitize("a\x00b\x07c\x1Bd") == "abcd"
    end

    test "strips DEL (U+007F)" do
      assert TextSanitizer.sanitize("a\x7Fb") == "ab"
    end

    test "handles nil" do
      assert TextSanitizer.sanitize(nil) == nil
    end

    test "handles empty string" do
      assert TextSanitizer.sanitize("") == ""
    end

    test "preserves UTF-8 letters with diacritics" do
      assert TextSanitizer.sanitize("café Müller") == "café Müller"
    end
  end
end