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 // This file is part of the Acts project.
 //
 // Copyright (C) 2021 CERN for the benefit of the Acts project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #include <boost/test/data/test_case.hpp>
 #include <boost/test/unit_test.hpp>
 
 #include "Acts/Utilities/Any.hpp"
 
 #include <any>
 #include <array>
 #include <cstddef>
 #include <type_traits>
 #include <utility>
 
 using namespace Acts;
 
 #if defined(_ACTS_ANY_ENABLE_TRACK_ALLOCATIONS)
 #define CHECK_ANY_ALLOCATIONS()                 \
   do {                                          \
     _AnyAllocationReporter::checkAllocations(); \
   } while (0)
 #else
 #define CHECK_ANY_ALLOCATIONS() \
   do {                          \
   } while (0)
 #endif
 
 BOOST_AUTO_TEST_SUITE(AnyTests)
 
 BOOST_AUTO_TEST_CASE(AnyConstructPrimitive) {
   {
     // small type
     Any a;
     BOOST_CHECK(!a);
 
     int v = 5;
     a = Any{v};
     BOOST_CHECK(!!a);
 
     BOOST_CHECK_EQUAL(a.as<int>(), v);
     BOOST_CHECK_NE(a.as<int>(), v + 1);
 
     BOOST_CHECK_THROW(a.as<float>(), std::bad_any_cast);
     BOOST_CHECK_THROW(a = Any{0.5f}, std::bad_any_cast);
   }
   CHECK_ANY_ALLOCATIONS();
 
   {
     // type that is large
     Any a;
     BOOST_CHECK(!a);
 
     std::array<int, 2> v{1, 2};
     a = Any{v};
     BOOST_CHECK(!!a);
 
     BOOST_CHECK_EQUAL_COLLECTIONS(a.as<decltype(v)>().begin(),
                                   a.as<decltype(v)>().end(), v.begin(),
                                   v.end());
     BOOST_CHECK_THROW(a.as<float>(), std::bad_any_cast);
     BOOST_CHECK_THROW(a = Any{0.5f}, std::bad_any_cast);
   }
   CHECK_ANY_ALLOCATIONS();
 
   {
     // type that is large
     Any a;
     BOOST_CHECK(!a);
 
     std::array<unsigned long, 5> v{1, 2, 3, 4, 5};
     a = Any{v};
     BOOST_CHECK(!!a);
 
     BOOST_CHECK_EQUAL_COLLECTIONS(a.as<decltype(v)>().begin(),
                                   a.as<decltype(v)>().end(), v.begin(),
                                   v.end());
     BOOST_CHECK_THROW(a.as<float>(), std::bad_any_cast);
     BOOST_CHECK_THROW(a = Any{0.5f}, std::bad_any_cast);
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyAssignConstructEmpty) {
   Any a;
   Any b;
   a = b;
   Any c{a};
   a = std::move(b);
   Any d{std::move(a)};
 
   BOOST_CHECK(!a);
   BOOST_CHECK(!b);
   BOOST_CHECK(!c);
   BOOST_CHECK(!d);
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyConstructCustom) {
   struct A {
     int value;
     A() { value = 76; }
   };
 
   Any a;
   BOOST_CHECK(!a);
   a = Any{A{}};
 
   BOOST_CHECK(!!a);
 
   BOOST_CHECK_EQUAL(a.as<A>().value, 76);
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyConstructCustomInPlace) {
   struct A {
     int value;
     A(int v) { value = v; }
   };
 
   Any a{std::in_place_type<A>, 42};
   BOOST_CHECK(!!a);
   BOOST_CHECK_EQUAL(a.as<A>().value, 42);
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyMove) {
   {
     // small type
     Any a;
     BOOST_CHECK(!a);
 
     int v = 5;
     a = Any{v};
     BOOST_CHECK(!!a);
 
     Any b = std::move(a);
     BOOST_CHECK(!!b);
     BOOST_CHECK_EQUAL(b.as<int>(), 5);
 
     Any c;
     c = std::move(b);
     BOOST_CHECK(!!c);
     BOOST_CHECK_EQUAL(c.as<int>(), 5);
   }
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyCopy) {
   {
     // small type
     Any a;
     BOOST_CHECK(!a);
 
     int v = 5;
     a = Any{v};
     BOOST_CHECK(!!a);
 
     Any b = a;
     BOOST_CHECK(!!b);
     BOOST_CHECK_EQUAL(b.as<int>(), 5);
 
     Any c;
     c = a;
     BOOST_CHECK(!!c);
     BOOST_CHECK_EQUAL(c.as<int>(), 5);
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 struct D {
   bool* destroyed;
   D(bool* d) : destroyed{d} {}
   ~D() { *destroyed = true; }
 };
 
 struct D2 {
   bool* destroyed{nullptr};
   std::array<char, 512> blob{};
 
   D2(bool* d) : destroyed{d} {}
 
   ~D2() { *destroyed = true; }
 };
 
 BOOST_AUTO_TEST_CASE(AnyDestroy) {
   {  // small type
     bool destroyed = false;
     D d{&destroyed};
     BOOST_CHECK(!destroyed);
     {
       Any a{std::move(d)};
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);
   }
   CHECK_ANY_ALLOCATIONS();
 
   {  // large type
     bool destroyed = false;
     D2 d{&destroyed};
     BOOST_CHECK(!destroyed);
     {
       Any a{std::move(d)};
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyDestroyCopy) {
   {  // small type
     bool destroyed = false;
 
     {
       Any b;
       {
         Any a{std::in_place_type<D>, &destroyed};
         BOOST_CHECK(!destroyed);
         b = a;
         BOOST_CHECK(!destroyed);
       }
       BOOST_CHECK(destroyed);  // a destroyed, should be true
       destroyed = false;
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);  // b destroyed, should be true again
   }
   CHECK_ANY_ALLOCATIONS();
 
   {  // large type
     bool destroyed = false;
 
     {
       Any b;
       {
         Any a{std::in_place_type<D2>, &destroyed};
         BOOST_CHECK(!destroyed);
         b = a;
         BOOST_CHECK(!destroyed);
       }
       BOOST_CHECK(destroyed);  // a destroyed, should be true
       destroyed = false;
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);  // b destroyed, should be true again
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(AnyDestroyInPlace) {
   {  // small type
     bool destroyed = false;
     BOOST_CHECK(!destroyed);
     {
       Any a{std::in_place_type<D>, &destroyed};
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);
   }
   CHECK_ANY_ALLOCATIONS();
 
   {  // large type
     bool destroyed = false;
     BOOST_CHECK(!destroyed);
     {
       Any a{std::in_place_type<D2>, &destroyed};
       BOOST_CHECK(!destroyed);
     }
     BOOST_CHECK(destroyed);
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 struct D3 {
   std::size_t* destroyed{nullptr};
   std::array<char, 512> blob{};
 
   D3(std::size_t* d) : destroyed{d} {}
 
   ~D3() { (*destroyed)++; }
 };
 
 BOOST_AUTO_TEST_CASE(LeakCheck) {
   std::size_t destroyed = 0;
   for (std::size_t i = 0; i < 10000; i++) {
     {
       BOOST_CHECK_EQUAL(destroyed, i);
       Any a;
       BOOST_CHECK_EQUAL(destroyed, i);
       a = Any{std::in_place_type<D3>, &destroyed};
       BOOST_CHECK_EQUAL(destroyed, i);
     }
     BOOST_CHECK_EQUAL(destroyed, i + 1);
   }
   CHECK_ANY_ALLOCATIONS();
 }
 
 struct LifecycleCounters {
   std::size_t nDestroy = 0;
   std::size_t nCopyConstruct = 0;
   std::size_t nCopy = 0;
   std::size_t nMoveConstruct = 0;
   std::size_t nMove = 0;
 };
 
 template <std::size_t PADDING>
 struct Lifecycle;
 
 template <>
 struct Lifecycle<0> {
   LifecycleCounters* counters;
 
   Lifecycle(LifecycleCounters* _counters) : counters{_counters} {}
 
   Lifecycle(Lifecycle&& o) {
     counters = o.counters;
     counters->nMoveConstruct++;
   }
 
   Lifecycle& operator=(Lifecycle&& o) {
     counters = o.counters;
     counters->nMove++;
     return *this;
   }
 
   Lifecycle(const Lifecycle& o) {
     counters = o.counters;
     counters->nCopyConstruct++;
   }
 
   Lifecycle& operator=(const Lifecycle& o) {
     counters = o.counters;
     counters->nCopy++;
     return *this;
   }
 
   ~Lifecycle() { counters->nDestroy++; }
 };
 
 template <std::size_t PADDING>
 struct Lifecycle : public Lifecycle<0> {
   std::array<char, PADDING> m_padding{};
 
   Lifecycle(LifecycleCounters* _counters) : Lifecycle<0>(_counters) {}
 };
 
 template <std::size_t PADDING>
 struct LifecycleHandle {
   LifecycleCounters counters;
   Lifecycle<PADDING> inner;
 
   LifecycleHandle() : counters{}, inner{&counters} {}
 };
 
 #define checkCounters()                                                      \
   do {                                                                       \
     BOOST_REQUIRE_EQUAL(l.counters.nCopy, counters.nCopy);                   \
     BOOST_REQUIRE_EQUAL(l.counters.nCopyConstruct, counters.nCopyConstruct); \
     BOOST_REQUIRE_EQUAL(l.counters.nMove, counters.nMove);                   \
     BOOST_REQUIRE_EQUAL(l.counters.nMoveConstruct, counters.nMoveConstruct); \
     BOOST_REQUIRE_EQUAL(l.counters.nDestroy, counters.nDestroy);             \
   } while (0)
 
 #define makeCounter(counter, n) \
   do {                          \
     counter += n;               \
     checkCounters();            \
   } while (0)
 
 #define incCopyConstruct(n) makeCounter(counters.nCopyConstruct, n)
 #define incCopy(n) makeCounter(counters.nCopy, n)
 #define incMoveConstruct(n) makeCounter(counters.nMoveConstruct, n)
 #define incMove(n) makeCounter(counters.nMove, n)
 #define incDestroy(n) makeCounter(counters.nDestroy, n)
 
 BOOST_AUTO_TEST_CASE(LifeCycleSmall) {
   LifecycleCounters counters;
   LifecycleHandle<0> l;
 
   checkCounters();
 
   {
     const auto& o = l.inner;  // force copy
     Any a{o};
     incCopyConstruct(1);
 
     const auto& _a = a;  // force copy later
     {
       Any b{_a};
       incCopyConstruct(1);
     }
     incDestroy(1);
 
     {
       Any b;
       b = _a;
       incCopyConstruct(1);
       b = _a;
       incCopy(1);
     }
     incDestroy(1);
 
     {
       Any b{a};
       incCopyConstruct(1);
       b = a;
       incCopy(1);
     }
     incDestroy(1);
 
     {
       auto _a2 = a;
       incCopyConstruct(1);
       Any b;
       b = std::move(_a2);
       incMoveConstruct(1);
       auto _a3 = a;
       incCopyConstruct(1);
       b = std::move(_a3);
       incMove(1);
     }
     incDestroy(3);
   }
   incDestroy(1);
 
   checkCounters();
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_CASE(LifeCycleHeap) {
   LifecycleCounters counters;
   LifecycleHandle<512> l;
 
   checkCounters();
 
   {
     const auto& o = l.inner;  // force copy
     Any a{o};
     incCopyConstruct(1);
 
     const auto& _a = a;  // force copy later
     {
       Any b{_a};
       incCopyConstruct(1);
     }
     incDestroy(1);
 
     {
       Any b;
       b = _a;
       incCopyConstruct(1);
       b = _a;
       incCopy(1);
     }
     incDestroy(1);
 
     {
       Any b{a};
       incCopyConstruct(1);
       b = a;
       incCopy(1);
     }
     incDestroy(1);
 
     {
       Any _a2 = a;
       incCopyConstruct(1);
       Any b;
       b = std::move(_a2);
       // no actual move
 
       Any _a3 = a;
       incCopyConstruct(1);
       b = std::move(_a3);
       // no actual move
       incDestroy(1);
     }
     incDestroy(1);
   }
   incDestroy(1);
 
   checkCounters();
 
   CHECK_ANY_ALLOCATIONS();
 }
 
 BOOST_AUTO_TEST_SUITE_END()

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