#include <catch2/catch_test_macros.hpp>

#include <string_view>  // IWYU pragma: keep
#include <variant>
#include <vector>

import ttwhy.scanners;

using namespace std::string_view_literals;

[[nodiscard]] constexpr auto static is_character(ttwhy::scanners::input_event & event, char expected) -> bool
{
  auto const * data = std::get_if<ttwhy::scanners::character_event>(&event);
  return data != nullptr && data->value == expected;
}

SCENARIO("The ANSI scanner processes printable ASCII and standard C0 control characters", "[scanner][ansi]")
{
  GIVEN("An initialized scanner and event sink")
  {
    auto queue = std::vector<ttwhy::scanners::input_event>{};
    auto sink = [&queue](auto const & event) {
      queue.push_back(event);
    };
    auto scanner = ttwhy::scanners::ansi{sink};

    WHEN("Processing a standard printable character")
    {
      scanner.process("A");

      THEN("It yields a single character event")
      {
        REQUIRE(queue.size() == 1);
        CHECK(is_character(queue.at(0), 'A'));
      }
    }
  }
}