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#include "framework.test.h"

#include <boost/core/demangle.hpp>
#include <cstdint>
#include <limits>
#include "wire/read.h"

namespace
{
  template<typename Target>
  void test_unsigned_to_unsigned(lest::env& lest_env)
  {
    using limit = std::numeric_limits<Target>;
    static constexpr const auto max =
      std::numeric_limits<std::uintmax_t>::max();
    static_assert(limit::is_integer, "expected integer");
    static_assert(!limit::is_signed, "expected unsigned");

    SETUP("uintmax_t to " + boost::core::demangle(typeid(Target).name()))
    {
      EXPECT(Target(0) == wire::integer::cast_unsigned<Target>(std::uintmax_t(0)));
      EXPECT(limit::max() == wire::integer::cast_unsigned<Target>(std::uintmax_t(limit::max())));
      if constexpr (limit::max() < max)
      {
        EXPECT_THROWS_AS(wire::integer::cast_unsigned<Target>(std::uintmax_t(limit::max()) + 1), wire::exception);
        EXPECT_THROWS_AS(wire::integer::cast_unsigned<Target>(max), wire::exception);
      }
    }
  }

  template<typename Target>
  void test_signed_to_signed(lest::env& lest_env)
  {
    using limit = std::numeric_limits<Target>;
    static constexpr const auto min =
      std::numeric_limits<std::intmax_t>::min();
    static constexpr const auto max =
      std::numeric_limits<std::intmax_t>::max();
    static_assert(limit::is_integer, "expected integer");
    static_assert(limit::is_signed, "expected signed");

    SETUP("intmax_t to " + boost::core::demangle(typeid(Target).name()))
    {
      if constexpr (min < limit::min())
      {
        EXPECT_THROWS_AS(wire::integer::cast_signed<Target>(std::intmax_t(limit::min()) - 1), wire::exception);
        EXPECT_THROWS_AS(wire::integer::cast_signed<Target>(min), wire::exception);
      }
      EXPECT(limit::min() == wire::integer::cast_signed<Target>(std::intmax_t(limit::min())));
      EXPECT(Target(0) == wire::integer::cast_signed<Target>(std::intmax_t(0)));
      EXPECT(limit::max() == wire::integer::cast_signed<Target>(std::intmax_t(limit::max())));
      if constexpr (limit::max() < max)
      {
        EXPECT_THROWS_AS(wire::integer::cast_signed<Target>(std::intmax_t(limit::max()) + 1), wire::exception);
        EXPECT_THROWS_AS(wire::integer::cast_signed<Target>(max), wire::exception);
      }
    }
  }
}


LWS_CASE("wire::integer::cast_*")
{
  SETUP("unsigned to unsigned")
  {
    test_unsigned_to_unsigned<std::uint8_t>(lest_env);
    test_unsigned_to_unsigned<std::uint16_t>(lest_env);
    test_unsigned_to_unsigned<std::uint32_t>(lest_env);
    test_unsigned_to_unsigned<std::uint64_t>(lest_env);
    test_unsigned_to_unsigned<std::uintmax_t>(lest_env);
  }
  SETUP("signed to signed")
  {
    test_signed_to_signed<std::int8_t>(lest_env);
    test_signed_to_signed<std::int16_t>(lest_env);
    test_signed_to_signed<std::int32_t>(lest_env);
    test_signed_to_signed<std::int64_t>(lest_env);
    test_signed_to_signed<std::intmax_t>(lest_env);
  }
}