/*
 *
 * Copyright 2015 gRPC authors.
 *
 * Licensed 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 <string.h>

#include <gtest/gtest.h>

#include <grpcpp/support/string_ref.h>

#include "test/core/util/test_config.h"

namespace grpc {
namespace {

const char kTestString[] = "blah";
const char kTestStringWithEmbeddedNull[] = "blah\0foo";
const size_t kTestStringWithEmbeddedNullLength = 8;
const char kTestUnrelatedString[] = "foo";

class StringRefTest : public ::testing::Test {};

TEST_F(StringRefTest, Empty) {
  string_ref s;
  EXPECT_EQ(0U, s.length());
  EXPECT_EQ(nullptr, s.data());
}

TEST_F(StringRefTest, FromCString) {
  string_ref s(kTestString);
  EXPECT_EQ(strlen(kTestString), s.length());
  EXPECT_EQ(kTestString, s.data());
}

TEST_F(StringRefTest, FromCStringWithLength) {
  string_ref s(kTestString, 2);
  EXPECT_EQ(2U, s.length());
  EXPECT_EQ(kTestString, s.data());
}

TEST_F(StringRefTest, FromString) {
  string copy(kTestString);
  string_ref s(copy);
  EXPECT_EQ(copy.data(), s.data());
  EXPECT_EQ(copy.length(), s.length());
}

TEST_F(StringRefTest, CopyConstructor) {
  string_ref s1(kTestString);
  ;
  const string_ref& s2(s1);
  EXPECT_EQ(s1.length(), s2.length());
  EXPECT_EQ(s1.data(), s2.data());
}

TEST_F(StringRefTest, FromStringWithEmbeddedNull) {
  string copy(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  string_ref s(copy);
  EXPECT_EQ(copy.data(), s.data());
  EXPECT_EQ(copy.length(), s.length());
  EXPECT_EQ(kTestStringWithEmbeddedNullLength, s.length());
}

TEST_F(StringRefTest, Assignment) {
  string_ref s1(kTestString);
  ;
  string_ref s2;
  EXPECT_EQ(nullptr, s2.data());
  s2 = s1;
  EXPECT_EQ(s1.length(), s2.length());
  EXPECT_EQ(s1.data(), s2.data());
}

TEST_F(StringRefTest, Iterator) {
  string_ref s(kTestString);
  size_t i = 0;
  for (auto it = s.cbegin(); it != s.cend(); ++it) {
    auto val = kTestString[i++];
    EXPECT_EQ(val, *it);
  }
  EXPECT_EQ(strlen(kTestString), i);
}

TEST_F(StringRefTest, ReverseIterator) {
  string_ref s(kTestString);
  size_t i = strlen(kTestString);
  for (auto rit = s.crbegin(); rit != s.crend(); ++rit) {
    auto val = kTestString[--i];
    EXPECT_EQ(val, *rit);
  }
  EXPECT_EQ(0U, i);
}

TEST_F(StringRefTest, Capacity) {
  string_ref empty;
  EXPECT_EQ(0U, empty.length());
  EXPECT_EQ(0U, empty.size());
  EXPECT_EQ(0U, empty.max_size());
  EXPECT_TRUE(empty.empty());

  string_ref s(kTestString);
  EXPECT_EQ(strlen(kTestString), s.length());
  EXPECT_EQ(s.length(), s.size());
  EXPECT_EQ(s.max_size(), s.length());
  EXPECT_FALSE(s.empty());
}

TEST_F(StringRefTest, Compare) {
  string_ref s1(kTestString);
  string s1_copy(kTestString);
  string_ref s2(kTestUnrelatedString);
  string_ref s3(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  EXPECT_EQ(0, s1.compare(s1_copy));
  EXPECT_NE(0, s1.compare(s2));
  EXPECT_NE(0, s1.compare(s3));
}

TEST_F(StringRefTest, StartsWith) {
  string_ref s1(kTestString);
  string_ref s2(kTestUnrelatedString);
  string_ref s3(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  EXPECT_TRUE(s1.starts_with(s1));
  EXPECT_FALSE(s1.starts_with(s2));
  EXPECT_FALSE(s2.starts_with(s1));
  EXPECT_FALSE(s1.starts_with(s3));
  EXPECT_TRUE(s3.starts_with(s1));
}

TEST_F(StringRefTest, Endswith) {
  string_ref s1(kTestString);
  string_ref s2(kTestUnrelatedString);
  string_ref s3(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  EXPECT_TRUE(s1.ends_with(s1));
  EXPECT_FALSE(s1.ends_with(s2));
  EXPECT_FALSE(s2.ends_with(s1));
  EXPECT_FALSE(s2.ends_with(s3));
  EXPECT_TRUE(s3.ends_with(s2));
}

TEST_F(StringRefTest, Find) {
  string_ref s1(kTestString);
  string_ref s2(kTestUnrelatedString);
  string_ref s3(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  EXPECT_EQ(0U, s1.find(s1));
  EXPECT_EQ(0U, s2.find(s2));
  EXPECT_EQ(0U, s3.find(s3));
  EXPECT_EQ(string_ref::npos, s1.find(s2));
  EXPECT_EQ(string_ref::npos, s2.find(s1));
  EXPECT_EQ(string_ref::npos, s1.find(s3));
  EXPECT_EQ(0U, s3.find(s1));
  EXPECT_EQ(5U, s3.find(s2));
  EXPECT_EQ(string_ref::npos, s1.find('z'));
  EXPECT_EQ(1U, s2.find('o'));
}

TEST_F(StringRefTest, SubString) {
  string_ref s(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  string_ref sub1 = s.substr(0, 4);
  EXPECT_EQ(string_ref(kTestString), sub1);
  string_ref sub2 = s.substr(5);
  EXPECT_EQ(string_ref(kTestUnrelatedString), sub2);
}

TEST_F(StringRefTest, ComparisonOperators) {
  string_ref s1(kTestString);
  string_ref s2(kTestUnrelatedString);
  string_ref s3(kTestStringWithEmbeddedNull, kTestStringWithEmbeddedNullLength);
  EXPECT_EQ(s1, s1);
  EXPECT_EQ(s2, s2);
  EXPECT_EQ(s3, s3);
  EXPECT_GE(s1, s1);
  EXPECT_GE(s2, s2);
  EXPECT_GE(s3, s3);
  EXPECT_LE(s1, s1);
  EXPECT_LE(s2, s2);
  EXPECT_LE(s3, s3);
  EXPECT_NE(s1, s2);
  EXPECT_NE(s1, s3);
  EXPECT_NE(s2, s3);
  EXPECT_GT(s3, s1);
  EXPECT_LT(s1, s3);
}

}  // namespace
}  // namespace grpc

int main(int argc, char** argv) {
  grpc::testing::TestEnvironment env(&argc, argv);
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}