/*
 * Copyright (C) 2018-2021 Intel Corporation
 *
 * SPDX-License-Identifier: MIT
 *
 */

#include "shared/source/helpers/hash.h"
#include "shared/source/helpers/string_helpers.h"

#include "gtest/gtest.h"

using NEO::Hash;

TEST(CreateCombinedStrings, GivenSingleStringWhenCreatingCombinedStringThenDstStringMatchesSrcString) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char srcString[] = "HelloWorld";
    const char *pSrcString = srcString;
    auto srcStrings = &pSrcString;
    size_t lengths = strlen(srcString);

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        1,
        srcStrings,
        &lengths);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(lengths + 1, dstStringSizeInBytes);

    EXPECT_EQ(0, strcmp(srcString, dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenNullLengthWhenCreatingCombinedStringThenDstStringIsCreatedCorrectly) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char srcString[] = "HelloWorld";
    const char *pSrcString = srcString;
    auto srcStrings = &pSrcString;

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        1,
        srcStrings,
        nullptr);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(srcString, dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenZeroLengthWhenCreatingCombinedStringThenDstStringIsCreatedCorrectly) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char srcString[] = "HelloWorld";
    const char *pSrcString = srcString;
    auto srcStrings = &pSrcString;
    size_t lengths = 0;

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        1,
        srcStrings,
        &lengths);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(srcString, dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenMultiStringWhenCreatingCombinedStringThenDstStringIsConcatenationOfSrcStrings) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *srcString[] = {"HelloWorld", "dlroWolleH"};
    std::string combined(srcString[0]);
    combined += srcString[1];

    auto srcStrings = &srcString[0];
    size_t lengths[2] = {strlen(srcString[0]), strlen(srcString[1])};

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        2,
        srcStrings,
        lengths);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(combined.c_str(), dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenMultiStringAndNullLengthWhenCreatingCombinedStringThenDstStringIsConcatenationOfSrcStrings) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *srcString[] = {"HelloWorld", "dlroWolleH"};
    std::string combined(srcString[0]);
    combined += srcString[1];
    auto srcStrings = &srcString[0];

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        2,
        srcStrings,
        nullptr);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(combined.c_str(), dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenMultiStringAndZeroLengthWhenCreatingCombinedStringThenDstStringIsConcatenationOfSrcStrings) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *srcString[] = {"HelloWorld", "dlroWolleH"};
    std::string combined(srcString[0]);
    combined += srcString[1];
    auto srcStrings = &srcString[0];
    size_t lengths[2] = {0, strlen(srcString[1])};

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        2,
        srcStrings,
        lengths);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(combined.c_str(), dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenMultipleStringsIncludingOneWithErrorWhenCreatingCombinedStringThenErrorIsOmittedInDstString) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *srcString[] = {"HelloWorld", "dlroWolleHBABA"};
    const char *expString[] = {"HelloWorld", "dlroWolleH"};
    size_t lengths[2] = {0, strlen(expString[1])};
    std::string combined(expString[0]);
    combined += expString[1];

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        2,
        srcString,
        lengths);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(combined.c_str(), dstString.c_str()));
}

TEST(CreateCombinedStrings, GivenInvalidInputWhenCreatingCombinedStringThenInvalidValueErrorIsReturned) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *srcString[] = {"HelloWorld", "dlroWolleH"};
    std::string combined(srcString[0]);
    combined += srcString[1];
    const char *srcStrings[2] = {srcString[0], srcString[1]};
    size_t lengths[2] = {0, strlen(srcString[1])};

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        0,
        srcStrings,
        lengths);
    EXPECT_EQ(CL_INVALID_VALUE, retVal);

    retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        1,
        nullptr,
        lengths);
    EXPECT_EQ(CL_INVALID_VALUE, retVal);

    srcStrings[0] = nullptr;
    retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        2,
        srcStrings,
        lengths);
    EXPECT_EQ(CL_INVALID_VALUE, retVal);
}

TEST(CreateCombinedStrings, GivenMultipleStringThatCountIsHigherThanMaximalStackSizeSizesWhenCreatingCombinedStringThenCorrectStringIsReturned) {
    std::string dstString;
    size_t dstStringSizeInBytes = 0;
    const char *defaultString = "hello";
    const char *srcString[StringHelpers::maximalStackSizeSizes + 2];
    std::string combinedString;
    for (int i = 0; i < StringHelpers::maximalStackSizeSizes + 2; i++) {
        srcString[i] = defaultString;
        combinedString += defaultString;
    }

    auto retVal = StringHelpers::createCombinedString(
        dstString,
        dstStringSizeInBytes,
        StringHelpers::maximalStackSizeSizes + 2,
        srcString,
        nullptr);

    EXPECT_EQ(CL_SUCCESS, retVal);
    EXPECT_EQ(0, strcmp(combinedString.c_str(), dstString.c_str()));
}

TEST(CreateHash, WhenGettingHashesThenHashesAreDeterministicAndDoNotCollide) {
    char pBuffer[128];
    memset(pBuffer, 0x23, sizeof(pBuffer));

    // make sure we can get a hash and make sure we can get the same hash
    auto hash1 = Hash::hash(pBuffer, sizeof(pBuffer));
    auto hash2 = Hash::hash(pBuffer, sizeof(pBuffer));
    EXPECT_NE(0u, hash1);
    EXPECT_NE(0u, hash2);
    EXPECT_EQ(hash1, hash2);

    // make sure that we get a different hash for different length/data
    auto hash3 = Hash::hash(pBuffer, sizeof(pBuffer) - 1);
    EXPECT_NE(0u, hash3);
    EXPECT_NE(hash2, hash3);
}

TEST(CreateHash, WhenGettingHashThenChangesPastLengthDoNotAffectOutput) {
    char pBuffer[] = {
        0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};

    // Use unaligned lengths. Wiggle the byte after the length
    // Shouldn't affect hash.
    for (auto length = 1u; length < sizeof(pBuffer); length++) {
        auto hash1 = Hash::hash(pBuffer, length);
        pBuffer[length]++;
        EXPECT_EQ(hash1, Hash::hash(pBuffer, length));
    }
}