#if ISPTR_USE_MODULES
    import isptr;
#else
    #include <intrusive_shared_ptr/ref_counted.h>
    #include <intrusive_shared_ptr/refcnt_ptr.h>
#endif

#include <doctest/doctest.h>
#include <type_traits>
#include <cstdint>

using namespace isptr;

namespace
{
    int derived_count = 0;

    struct derived_counted : weak_ref_counted_st<derived_counted>
    {
        friend ref_counted;
    public:
        derived_counted() noexcept 
        {
            ++derived_count;
        }
    private:
        ~derived_counted() noexcept
        {
            auto weak = get_weak_ptr();
            CHECK(weak);
            --derived_count;
        }    
    };

    
    int wrapped_count = 0;
    struct wrapped
    {
        wrapped()
        {
            ++wrapped_count;
        }
        ~wrapped()
        {
            --wrapped_count;
        }
        
        int value = 5;
    };

    using wrapped_counted = weak_ref_counted_adapter_st<wrapped>;

    int with_custom_weak_reference_count = 0;

    struct custom_weak_reference;

    class with_custom_weak_reference : public ref_counted<with_custom_weak_reference, 
                                                            ref_counted_flags::provide_weak_references |
                                                            ref_counted_flags::single_threaded>
    {
    friend ref_counted;
        
    public:
        with_custom_weak_reference()
        {
            ++with_custom_weak_reference_count;
        }
    private:
        
        ~with_custom_weak_reference() noexcept
        {
            auto weak = get_weak_ptr();
            CHECK(weak);
            --with_custom_weak_reference_count;
        }
        
        custom_weak_reference * make_weak_reference(intptr_t count) const;
    };

    struct custom_weak_reference : weak_reference<with_custom_weak_reference>
    {
        custom_weak_reference(intptr_t count, with_custom_weak_reference * obj): weak_reference(count, obj)
        {}
        
        ~custom_weak_reference()
        {
            CHECK(on_owner_destruction_called);
            CHECK(with_custom_weak_reference_count == 0);
        }
        
        void on_owner_destruction() const
        {
            CHECK(with_custom_weak_reference_count == 0); //owner is still alive but its refcount is 0, you cannot ressurrect!
            on_owner_destruction_called = true;
        }
        
        mutable bool on_owner_destruction_called = false;
    };

    inline custom_weak_reference * with_custom_weak_reference::make_weak_reference(intptr_t count) const
        { return new custom_weak_reference(count, const_cast<with_custom_weak_reference *>(this)); }
}

TEST_SUITE("traits") {

TEST_CASE( "Weak ref counted st type traits are correct" ) {

    SUBCASE( "Base" ) {

        CHECK( weak_ref_counted_st<derived_counted>::single_threaded);
        CHECK( !std::is_default_constructible_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_copy_constructible_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_move_constructible_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_copy_assignable_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_move_assignable_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_swappable_v<weak_ref_counted_st<derived_counted>> );
        CHECK( !std::is_destructible_v<weak_ref_counted_st<derived_counted>> );
    }

    SUBCASE( "Derived" ) {
        CHECK( derived_counted::single_threaded);
        CHECK( !std::is_default_constructible_v<derived_counted> );
        CHECK( !std::is_copy_constructible_v<derived_counted> );
        CHECK( !std::is_move_constructible_v<derived_counted> );
        CHECK( !std::is_copy_assignable_v<derived_counted> );
        CHECK( !std::is_move_assignable_v<derived_counted> );
        CHECK( !std::is_swappable_v<derived_counted> );
        CHECK( !std::is_destructible_v<derived_counted> );
    }

    SUBCASE( "Derived WeakRef" ) {

        CHECK( derived_counted::weak_value_type::single_threaded);
        CHECK( !std::is_default_constructible_v<derived_counted::weak_value_type> );
        CHECK( !std::is_copy_constructible_v<derived_counted::weak_value_type> );
        CHECK( !std::is_move_constructible_v<derived_counted::weak_value_type> );
        CHECK( !std::is_copy_assignable_v<derived_counted::weak_value_type> );
        CHECK( !std::is_move_assignable_v<derived_counted::weak_value_type> );
        CHECK( !std::is_swappable_v<derived_counted::weak_value_type> );
        CHECK( !std::is_destructible_v<derived_counted::weak_value_type> );
    }

    SUBCASE( "Wrapped" ) {
        CHECK( wrapped_counted::single_threaded);
        CHECK( !std::is_default_constructible_v<wrapped_counted> );
        CHECK( !std::is_copy_constructible_v<wrapped_counted> );
        CHECK( !std::is_move_constructible_v<wrapped_counted> );
        CHECK( !std::is_copy_assignable_v<wrapped_counted> );
        CHECK( !std::is_move_assignable_v<wrapped_counted> );
        CHECK( !std::is_destructible_v<wrapped_counted> );
    }

    SUBCASE( "Wrapped WeakRef" ) {
        CHECK( wrapped_counted::weak_value_type::single_threaded);
        CHECK( !std::is_default_constructible_v<wrapped_counted::weak_value_type> );
        CHECK( !std::is_copy_constructible_v<wrapped_counted::weak_value_type> );
        CHECK( !std::is_move_constructible_v<wrapped_counted::weak_value_type> );
        CHECK( !std::is_copy_assignable_v<wrapped_counted::weak_value_type> );
        CHECK( !std::is_move_assignable_v<wrapped_counted::weak_value_type> );
        CHECK( !std::is_destructible_v<wrapped_counted::weak_value_type> );
    }
}

}

TEST_SUITE("ref_counted_st") {

TEST_CASE( "Weak ref counted st works" ) {

    SUBCASE( "Derived" ) {
        auto original = refcnt_attach(new derived_counted());
        auto weak1 = original->get_weak_ptr();
        CHECK(derived_count == 1);
        auto strong1 = weak1->lock();
        CHECK(original == strong1);
        auto weak2 = strong1->get_weak_ptr();
        CHECK(weak1 == weak2);
        auto weak3 = weak_cast(strong1);
        CHECK(weak1 == weak3);
        original.reset();
        strong1.reset();
        CHECK(derived_count == 0);

        strong1 = weak1->lock();
        CHECK(!strong1);
    }
    
    SUBCASE( "Const Derived" ) {
        refcnt_ptr<const derived_counted> original = refcnt_attach(new derived_counted());
        auto weak1 = original->get_weak_ptr();
        CHECK(derived_count == 1);
        auto strong1 = weak1->lock();
        CHECK(original == strong1);
        auto weak2 = strong1->get_weak_ptr();
        CHECK(weak1 == weak2);
        original.reset();
        strong1.reset();
        CHECK(derived_count == 0);

        strong1 = weak1->lock();
        CHECK(!strong1);
        strong1 = strong_cast(weak2);
        CHECK(!strong1);
    }

    SUBCASE( "Wrapped" ) {
        
        auto p = refcnt_attach(new wrapped_counted());
        CHECK(wrapped_count == 1);
        CHECK(p->value == 5);
        p.reset();
        CHECK( wrapped_count == 0 );
    }
    
    SUBCASE( "Custom Weak Reference" ) {
        
        auto strong = refcnt_attach(new with_custom_weak_reference);
        CHECK(with_custom_weak_reference_count == 1);
        auto weak = strong->get_weak_ptr();
        auto strong1 = weak->lock();
        CHECK( strong1 == strong );
        CHECK(with_custom_weak_reference_count == 1);
        strong.reset();
        CHECK(with_custom_weak_reference_count == 1);
        strong1.reset();
        CHECK(with_custom_weak_reference_count == 0);
        strong1 = weak->lock();
        CHECK(!strong1);
    }
}

}
