#include "FruUtils.hpp"

#include <array>

#include "gtest/gtest.h"

extern "C"
{
// Include for I2C_SMBUS_BLOCK_MAX
#include <linux/i2c.h>
}

TEST(ValidateHeaderTest, InvalidFruVersionReturnsFalse)
{
    // Validates the FruVersion is checked for the only legal value.
    constexpr std::array<uint8_t, I2C_SMBUS_BLOCK_MAX> fruHeader = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

    EXPECT_FALSE(validateHeader(fruHeader));
}

TEST(ValidateHeaderTest, InvalidReservedReturnsFalse)
{
    // Validates the reserved bit(7:4) of first bytes.
    constexpr std::array<uint8_t, I2C_SMBUS_BLOCK_MAX> fruHeader = {
        0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

    EXPECT_FALSE(validateHeader(fruHeader));
}

TEST(ValidateHeaderTest, InvalidPaddingReturnsFalse)
{
    // Validates the padding byte (7th byte).
    constexpr std::array<uint8_t, I2C_SMBUS_BLOCK_MAX> fruHeader = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00};

    EXPECT_FALSE(validateHeader(fruHeader));
}

TEST(ValidateHeaderTest, InvalidChecksumReturnsFalse)
{
    // Validates the checksum, check for incorrect value.
    constexpr std::array<uint8_t, I2C_SMBUS_BLOCK_MAX> fruHeader = {
        0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x00, 0x00};

    EXPECT_FALSE(validateHeader(fruHeader));
}

TEST(ValidateHeaderTest, ValidChecksumReturnsTrue)
{
    // Validates the checksum, check for correct value.
    constexpr std::array<uint8_t, I2C_SMBUS_BLOCK_MAX> fruHeader = {
        0x01, 0x00, 0x01, 0x02, 0x03, 0x04, 0x00, 0xf5};

    EXPECT_TRUE(validateHeader(fruHeader));
}

TEST(VerifyOffsetTest, EmptyFruDataReturnsFalse)
{
    // Validates the FruData size is checked for non empty.
    std::vector<uint8_t> fruData = {};

    EXPECT_FALSE(verifyOffset(fruData, fruAreas::fruAreaChassis, 0));
}

TEST(VerifyOffsetTest, AreaOutOfRangeReturnsFalse)
{
    // Validates the FruArea value, check if it is within range.
    const std::vector<uint8_t> fruData = {0x01, 0x00, 0x00, 0x00, 0x00,
                                          0x00, 0x00, 0x00, 0x00};

    unsigned int areaOutOfRange = 8;
    EXPECT_FALSE(
        verifyOffset(fruData, static_cast<fruAreas>(areaOutOfRange), 0));
}

TEST(VerifyOffsetTest, OverlapNextAreaReturnsFalse)
{
    // Validates the Overlap of offsets with overlapped values.
    const std::vector<uint8_t> fruData = {0x01, 0x00, 0x01, 0x02, 0x03,
                                          0x04, 0x00, 0x00, 0x00};

    EXPECT_FALSE(verifyOffset(fruData, fruAreas::fruAreaChassis, 2));
}

TEST(VerifyOffsetTest, OverlapPrevAreaReturnsFalse)
{
    // Validates the Overlap of offsets with overlapped values.
    const std::vector<uint8_t> fruData = {0x01, 0x00, 0x01, 0x03, 0x02,
                                          0x07, 0x00, 0x00, 0x00};

    EXPECT_FALSE(verifyOffset(fruData, fruAreas::fruAreaProduct, 2));
}

TEST(VerifyOffsetTest, ValidInputDataNoOverlapReturnsTrue)
{
    // Validates all inputs with expected value and no overlap.
    const std::vector<uint8_t> fruData = {0x01, 0x00, 0x01, 0x02, 0x03,
                                          0x04, 0x00, 0x00, 0x00};

    EXPECT_TRUE(verifyOffset(fruData, fruAreas::fruAreaChassis, 1));
}

TEST(VerifyChecksumTest, EmptyInput)
{
    std::vector<uint8_t> data = {};

    EXPECT_EQ(calculateChecksum(data), 0);
}

TEST(VerifyChecksumTest, SingleOneInput)
{
    std::vector<uint8_t> data(1, 1);

    EXPECT_EQ(calculateChecksum(data), 255);
}

TEST(VerifyChecksumTest, AllOneInput)
{
    std::vector<uint8_t> data(256, 1);

    EXPECT_EQ(calculateChecksum(data), 0);
}

TEST(VerifyChecksumTest, WrapBoundaryLow)
{
    std::vector<uint8_t> data = { 255, 0 };

    EXPECT_EQ(calculateChecksum(data), 1);
}

TEST(VerifyChecksumTest, WrapBoundaryExact)
{
    std::vector<uint8_t> data = { 255, 1 };

    EXPECT_EQ(calculateChecksum(data), 0);
}

TEST(VerifyChecksumTest, WrapBoundaryHigh)
{
    std::vector<uint8_t> data = { 255, 2 };

    EXPECT_EQ(calculateChecksum(data), 255);
}