/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include <dmlc/logging.h>
#include <gtest/gtest.h>
#include <tvm/runtime/container.h>
#include <tvm/tir/op.h>

#include <new>
#include <unordered_map>
#include <vector>

using namespace tvm;
using namespace tvm::tir;
using namespace tvm::runtime;

class TestErrorSwitch {
 public:
  // Need this so that destructor of temporary objects don't interrupt our
  // testing.
  TestErrorSwitch(const TestErrorSwitch& other)
      : should_fail(other.should_fail) {
    const_cast<TestErrorSwitch&>(other).should_fail = false;
  }

  TestErrorSwitch(bool fail_flag) : should_fail{fail_flag} {}
  bool should_fail{false};

  ~TestErrorSwitch() {
    if (should_fail) {
      exit(1);
    }
  }
};

class TestArrayObj : public Object,
                     public InplaceArrayBase<TestArrayObj, TestErrorSwitch> {
 public:
  static constexpr const uint32_t _type_index = TypeIndex::kDynamic;
  static constexpr const char* _type_key = "test.TestArrayObj";
  TVM_DECLARE_FINAL_OBJECT_INFO(TestArrayObj, Object);
  uint32_t size;

  size_t GetSize() const { return size; }

  template <typename Iterator>
  void Init(Iterator begin, Iterator end) {
    size_t num_elems = std::distance(begin, end);
    this->size = 0;
    auto it = begin;
    for (size_t i = 0; i < num_elems; ++i) {
      InplaceArrayBase::EmplaceInit(i, *it++);
      if (i == 1) {
        throw std::bad_alloc();
      }
      // Only increment size after the initialization succeeds
      this->size++;
    }
  }

  template <typename Iterator>
  void WrongInit(Iterator begin, Iterator end) {
    size_t num_elems = std::distance(begin, end);
    this->size = num_elems;
    auto it = begin;
    for (size_t i = 0; i < num_elems; ++i) {
      InplaceArrayBase::EmplaceInit(i, *it++);
      if (i == 1) {
        throw std::bad_alloc();
      }
    }
  }

  friend class InplaceArrayBase;
};

TEST(ADT, Constructor) {
  std::vector<ObjectRef> fields;
  auto f1 = ADT::Tuple(fields);
  auto f2 = ADT::Tuple(fields);
  ADT v1{1, {f1, f2}};
  ASSERT_EQ(f1.tag(), 0);
  ASSERT_EQ(f2.size(), 0);
  ASSERT_EQ(v1.tag(), 1);
  ASSERT_EQ(v1.size(), 2);
  ASSERT_EQ(Downcast<ADT>(v1[0]).tag(), 0);
  ASSERT_EQ(Downcast<ADT>(v1[1]).size(), 0);
}

TEST(InplaceArrayBase, BadExceptionSafety) {
  auto wrong_init = []() {
    TestErrorSwitch f1{false};
    // WrongInit will set size to 3 so it will call destructor at index 1, which
    // will exit with error status.
    TestErrorSwitch f2{true};
    TestErrorSwitch f3{false};
    std::vector<TestErrorSwitch> fields{f1, f2, f3};
    auto ptr =
        make_inplace_array_object<TestArrayObj, TestErrorSwitch>(fields.size());
    try {
      ptr->WrongInit(fields.begin(), fields.end());
    } catch (...) {
    }
    // Call ~InplaceArrayBase
    ptr.reset();
    // never reaches here.
    exit(0);
  };
  ASSERT_EXIT(wrong_init(), ::testing::ExitedWithCode(1), "");
}

TEST(InplaceArrayBase, ExceptionSafety) {
  auto correct_init = []() {
    TestErrorSwitch f1{false};
    // Init will fail at index 1, so destrucotr at index 1 should not be called
    // since it's not initalized.
    TestErrorSwitch f2{true};
    std::vector<TestErrorSwitch> fields{f1, f2};
    auto ptr =
        make_inplace_array_object<TestArrayObj, TestErrorSwitch>(fields.size());
    try {
      ptr->Init(fields.begin(), fields.end());
    } catch (...) {
    }
    // Call ~InplaceArrayBase
    ptr.reset();
    // Skip the destructors of f1, f2, and fields
    exit(0);
  };
  ASSERT_EXIT(correct_init(), ::testing::ExitedWithCode(0), "");
}

TEST(Array, PrimExpr) {
  using namespace tvm;
  Var x("x");
  auto z = max(x + 1 + 2, 100);
  Array<PrimExpr> list{x, z, z};
  LOG(INFO) << list.size();
  LOG(INFO) << list[0];
  LOG(INFO) << list[1];
}

TEST(Array, Mutate) {
  using namespace tvm;
  Var x("x");
  auto z = max(x + 1 + 2, 100);
  Array<PrimExpr> list{x, z, z};
  auto list2 = list;
  list.Set(1, x);
  CHECK(list[1].same_as(x));
  CHECK(list2[1].same_as(z));
}

TEST(Array, Iterator) {
  using namespace tvm;
  Array<PrimExpr> array{1, 2, 3};
  std::vector<PrimExpr> vector(array.begin(), array.end());
  CHECK(vector[1].as<IntImmNode>()->value == 2);
}

TEST(Map, Expr) {
  using namespace tvm;
  Var x("x");
  auto z = max(x + 1 + 2, 100);
  auto zz = z + 1;
  Map<PrimExpr, PrimExpr> dict{{x, z}, {z, 2}};
  CHECK(dict.size() == 2);
  CHECK(dict[x].same_as(z));
  CHECK(dict.count(z));
  CHECK(!dict.count(zz));
}

TEST(StrMap, Expr) {
  using namespace tvm;
  Var x("x");
  auto z = max(x + 1 + 2, 100);
  Map<std::string, PrimExpr> dict{{"x", z}, {"z", 2}};
  CHECK(dict.size() == 2);
  CHECK(dict["x"].same_as(z));
}

TEST(Map, Mutate) {
  using namespace tvm;
  Var x("x");
  auto z = max(x + 1 + 2, 100);
  Map<PrimExpr, PrimExpr> dict{{x, z}, {z, 2}};
  auto zz = z + 1;
  CHECK(dict[x].same_as(z));
  dict.Set(x, zz);
  auto dict2 = dict;
  CHECK(dict2.count(z) == 1);
  dict.Set(zz, x);
  CHECK(dict2.count(zz) == 0);
  CHECK(dict.count(zz) == 1);

  auto it = dict.find(zz);
  CHECK(it != dict.end() && (*it).second.same_as(x));

  it = dict2.find(zz);
  CHECK(it == dict.end());

  LOG(INFO) << dict;
}

TEST(Map, Iterator) {
  using namespace tvm;
  PrimExpr a = 1, b = 2;
  Map<PrimExpr, PrimExpr> map1{{a, b}};
  std::unordered_map<PrimExpr, PrimExpr, ObjectHash, ObjectEqual> map2(
      map1.begin(), map1.end());
  CHECK(map2[a].as<IntImmNode>()->value == 2);
}

TEST(String, MoveFromStd) {
  using namespace std;
  string source = "this is a string";
  string expect = source;
  String s(std::move(source));
  string copy = (string)s;
  CHECK_EQ(copy, expect);
  CHECK_EQ(source.size(), 0);
}

TEST(String, CopyFromStd) {
  using namespace std;
  string source = "this is a string";
  string expect = source;
  String s{source};
  string copy = (string)s;
  CHECK_EQ(copy, expect);
  CHECK_EQ(source.size(), expect.size());
}

TEST(String, Assignment) {
  using namespace std;
  String s{string{"hello"}};
  s = string{"world"};
  CHECK_EQ(s == "world", true);
  string s2{"world2"};
  s = std::move(s2);
  CHECK_EQ(s == "world2", true);
}

TEST(String, empty) {
  using namespace std;
  String s{"hello"};
  CHECK_EQ(s.empty(), false);
  s = "";
  CHECK_EQ(s.empty(), true);
}

TEST(String, Comparisons) {
  using namespace std;
  string source = "a string";
  string mismatch = "a string but longer";
  String s{source};

  CHECK_EQ(s == source, true);
  CHECK_EQ(s == mismatch, false);
  CHECK_EQ(s == source.data(), true);
  CHECK_EQ(s == mismatch.data(), false);
}

// Check '\0' handling
TEST(String, null_byte_handling) {
  using namespace std;
  // Ensure string still compares equal if it contains '\0'.
  string v1 = "hello world";
  size_t v1_size = v1.size();
  v1[5] = '\0';
  CHECK_EQ(v1[5], '\0');
  CHECK_EQ(v1.size(), v1_size);
  String str_v1{v1};
  CHECK_EQ(str_v1.compare(v1), 0);
  CHECK_EQ(str_v1.size(), v1_size);

  // Ensure bytes after '\0' are taken into account for mismatches.
  string v2 = "aaa one";
  string v3 = "aaa two";
  v2[3] = '\0';
  v3[3] = '\0';
  String str_v2{v2};
  String str_v3{v3};
  CHECK_EQ(str_v2.compare(str_v3), -1);
  CHECK_EQ(str_v2.size(), 7);
  // strcmp won't be able to detect the mismatch
  CHECK_EQ(strcmp(v2.data(), v3.data()), 0);
  // string::compare can handle \0 since it knows size
  CHECK_LT(v2.compare(v3), 0);

  // If there is mismatch before '\0', should still handle it.
  string v4 = "acc one";
  string v5 = "abb two";
  v4[3] = '\0';
  v5[3] = '\0';
  String str_v4{v4};
  String str_v5{v5};
  CHECK_GT(str_v4.compare(str_v5), 0);
  CHECK_EQ(str_v4.size(), 7);
  // strcmp is able to detect the mismatch
  CHECK_GT(strcmp(v4.data(), v5.data()), 0);
  // string::compare can handle \0 since it knows size
  CHECK_GT(v4.compare(v5), 0);
}

TEST(String, compare_same_memory_region_different_size) {
  using namespace std;
  string source = "a string";
  String str_source{source};
  char* memory = const_cast<char*>(str_source.data());
  CHECK_EQ(str_source.compare(memory), 0);
  // This changes the string size
  memory[2] = '\0';
  // memory is logically shorter now
  CHECK_GT(str_source.compare(memory), 0);
}

TEST(String, compare) {
  using namespace std;
  string source = "a string";
  string mismatch1 = "a string but longer";
  string mismatch2 = "a strin";
  string mismatch3 = "a b";
  string mismatch4 = "a t";
  String str_source{source};
  String str_mismatch1{mismatch1};
  String str_mismatch2{mismatch2};
  String str_mismatch3{mismatch3};
  String str_mismatch4{mismatch4};

  // compare with string
  CHECK_EQ(str_source.compare(source), 0);
  CHECK_LT(str_source.compare(mismatch1), 0);
  CHECK_GT(str_source.compare(mismatch2), 0);
  CHECK_GT(str_source.compare(mismatch3), 0);
  CHECK_LT(str_source.compare(mismatch4), 0);

  // compare with char*
  CHECK_EQ(str_source.compare(source.data()), 0);
  CHECK_LT(str_source.compare(mismatch1.data()), 0);
  CHECK_GT(str_source.compare(mismatch2.data()), 0);
  CHECK_GT(str_source.compare(mismatch3.data()), 0);
  CHECK_LT(str_source.compare(mismatch4.data()), 0);

  // compare with String
  CHECK_LT(str_source.compare(str_mismatch1), 0);
  CHECK_GT(str_source.compare(str_mismatch2), 0);
  CHECK_GT(str_source.compare(str_mismatch3), 0);
  CHECK_LT(str_source.compare(str_mismatch4), 0);
}

TEST(String, c_str) {
  using namespace std;
  string source = "this is a string";
  string mismatch = "mismatch";
  String s{source};

  CHECK_EQ(std::strcmp(s.c_str(), source.data()), 0);
  CHECK_NE(std::strcmp(s.c_str(), mismatch.data()), 0);
}

TEST(String, hash) {
  using namespace std;
  string source = "this is a string";
  String s{source};
  std::hash<String>()(s);

  std::unordered_map<String, std::string> map;
  String k1{string{"k1"}};
  string v1{"v1"};
  String k2{string{"k2"}};
  string v2{"v2"};
  map[k1] = v1;
  map[k2] = v2;

  CHECK_EQ(map[k1], v1);
  CHECK_EQ(map[k2], v2);
}

TEST(String, Cast) {
  using namespace std;
  string source = "this is a string";
  String s{source};
  ObjectRef r = s;
  String s2 = Downcast<String>(r);
}

int main(int argc, char** argv) {
  testing::InitGoogleTest(&argc, argv);
  testing::FLAGS_gtest_death_test_style = "threadsafe";
  return RUN_ALL_TESTS();
}
