#include "turns/core/participant.hpp"

#include "turns/core/disposition.hpp"

#include <catch2/catch_approx.hpp>
#include <catch2/catch_test_macros.hpp>

#include <nlohmann/json.hpp>

#include <compare>

namespace turns::core::tests
{

  TEST_CASE("A freshly constructed participant")
  {
    auto constexpr constructed_name = "Vana Thistletop";
    auto constexpr constructed_priority = 17;
    auto constexpr constructed_disposition = disposition::friendly;
    auto instance = participant{constructed_name, constructed_priority, constructed_disposition};

    SECTION("can be created")
    {
      REQUIRE(participant::create(constructed_name, constructed_priority, constructed_disposition));
    }

    SECTION("allows access to its disposition")
    {
      SECTION("allowing to get it")
      {
        REQUIRE(instance.disposition() == constructed_disposition);
      }

      SECTION("allowing to get it via a constant object")
      {
        auto const & cref = instance;
        REQUIRE(cref.disposition() == constructed_disposition);
      }

      SECTION("allowing to set it")
      {
        instance.disposition() = disposition::hostile;
        REQUIRE(instance.disposition() == disposition::hostile);
      }
    }

    SECTION("allows access to its name")
    {
      SECTION("allowing to get it")
      {
        REQUIRE(instance.name() == constructed_name);
      }

      SECTION("allowing to get it via a constant object")
      {
        auto const & cref = instance;
        REQUIRE(cref.name() == constructed_name);
      }

      SECTION("allowing to set it")
      {
        instance.name() = "replaced";
        REQUIRE(instance.name() == "replaced");
      }
    }

    SECTION("allows access to its priority")
    {
      SECTION("allowing to get it")
      {
        REQUIRE(instance.priority() == constructed_priority);
      }

      SECTION("allowing to get it via a constant object")
      {
        auto const & cref = instance;
        REQUIRE(cref.priority() == constructed_priority);
      }

      SECTION("allowing to set it")
      {
        instance.priority() = 4;
        REQUIRE(instance.priority() == 4);
      }
    }

    SECTION("can be compared with another participant")
    {
      auto equivalent_instance = participant{"Equivalent", constructed_priority, constructed_disposition};
      auto lesser_instance = participant{"Lesser", constructed_priority - 1, constructed_disposition};
      auto greater_instance = participant{"Greater", constructed_priority + 1, constructed_disposition};

      SECTION("yielding std::partial_ordering::equivalent for itself")
      {
        REQUIRE((instance <=> equivalent_instance) == std::partial_ordering::equivalent);
      }

      SECTION("yielding std::partial_ordering::equivalent for an equivalent participant")
      {
        REQUIRE((instance <=> equivalent_instance) == std::partial_ordering::equivalent);
      }

      SECTION("yielding std::partial_ordering::greater for a lesser participant")
      {
        REQUIRE((instance <=> lesser_instance) == std::partial_ordering::greater);
      }

      SECTION("yielding std::partial_ordering::less for a greater participant")
      {
        REQUIRE((instance <=> greater_instance) == std::partial_ordering::less);
      }
    }
  }

  TEST_CASE("Serializing a participant")
  {
    auto instance = participant::create("Participant #0", 17.2, disposition::friendly);
    auto serialized = instance->serialize();

    SECTION("the active state is de-serialized correctly")
    {
      REQUIRE_FALSE(serialized.at("active"));
    }

    SECTION("the disposition is serialized correctly")
    {
      REQUIRE(serialized.at("disposition") == disposition::friendly);
    }

    SECTION("the name is serialized correctly")
    {
      REQUIRE(serialized.at("name") == "Participant #0");
    }

    SECTION("the priority is serialized correctly")
    {
      REQUIRE(serialized.at("priority") == Catch::Approx{17.2});
    }
  }

  TEST_CASE("De-Serializing a participant")
  {
    auto serialized = nlohmann::json::parse(R"(
    {
    "name": "Participant #1",
    "priority": -2.3,
    "disposition": 2,
    "active": true
    }
    )");
    auto instance = participant::create(serialized);

    SECTION("the active state is de-serialized correctly")
    {
      REQUIRE(instance->is_active());
    }

    SECTION("the disposition is de-serialized correctly")
    {
      REQUIRE(instance->disposition() == disposition::hostile);
    }

    SECTION("the name is de-serialized correctly")
    {
      REQUIRE(instance->name() == "Participant #1");
    }

    SECTION("the priority is de-serialized correctly")
    {
      REQUIRE(instance->priority() == Catch::Approx{-2.3});
    }
  }

}  // namespace turns::core::tests