#include <library/cpp/testing/gtest/gtest.h>

#include <library/cpp/yt/string/enum.h>
#include <library/cpp/yt/string/format.h>

#include <limits>

namespace NYT {
namespace {

////////////////////////////////////////////////////////////////////////////////

// Some compile-time sanity checks.
DEFINE_ENUM(ESample, (One)(Two));
static_assert(CFormattable<ESample>);
static_assert(CFormattable<TEnumIndexedArray<ESample, int>>);

DEFINE_ENUM(EColor,
    (Red)
    (BlackAndWhite)
);

DEFINE_BIT_ENUM(ELangs,
    ((None)       (0x00))
    ((Cpp)        (0x01))
    ((Go)         (0x02))
    ((Rust)       (0x04))
    ((Python)     (0x08))
    ((JavaScript) (0x10))
    ((CppGo)      (0x03))
    ((All)        (0x1f))
);

DEFINE_BIT_ENUM(ELangsWithUnknown,
    ((None)       (0x00))
    ((Cpp)        (0x01))
    ((Go)         (0x02))
    ((Rust)       (0x04))
    ((Python)     (0x08))
    ((JavaScript) (0x10))
    ((CppGo)      (0x03))
    ((All)        (0x1f))
    ((Unknown)    (0x20))
);
DEFINE_ENUM_UNKNOWN_VALUE(ELangsWithUnknown, Unknown);

DEFINE_ENUM(ECustomDomainName,
    ((A) (1) ("value_a"))
    ((B) (2) ("value_b"))
);

DEFINE_ENUM(EColorWithUnknown,
    (Red)
    (Green)
    (Unknown)
);
DEFINE_ENUM_UNKNOWN_VALUE(EColorWithUnknown, Unknown);

DEFINE_BIT_ENUM(EBitEnumWithoutNone,
    ((Some)(1))
);

TEST(TFormatTest, Enum)
{
    EXPECT_EQ("Red", Format("%v", EColor::Red));
    EXPECT_EQ("red", Format("%lv", EColor::Red));

    EXPECT_EQ("BlackAndWhite", Format("%v", EColor::BlackAndWhite));
    EXPECT_EQ("black_and_white", Format("%lv", EColor::BlackAndWhite));

    EXPECT_EQ("EColor::unknown-100", Format("%v", EColor(100)));
    EXPECT_EQ("Cpp | ELangs::unknown-32", Format("%v", ELangs(0x21)));

    EXPECT_EQ("JavaScript", Format("%v", ELangs::JavaScript));
    EXPECT_EQ("java_script", Format("%lv", ELangs::JavaScript));

    EXPECT_EQ("None", Format("%v", ELangs::None));
    EXPECT_EQ("none", Format("%lv", ELangs::None));

    EXPECT_EQ("", Format("%v", EBitEnumWithoutNone()));

    EXPECT_EQ("Cpp | Go", Format("%v", ELangs::Cpp | ELangs::Go));
    EXPECT_EQ("cpp | go", Format("%lv", ELangs::Cpp | ELangs::Go));

    auto four = ELangs::Cpp | ELangs::Go | ELangs::Python | ELangs::JavaScript;
    EXPECT_EQ("Cpp | Go | Python | JavaScript", Format("%v", four));
    EXPECT_EQ("cpp | go | python | java_script", Format("%lv", four));
}

TEST(TFormatEnumTest, FormatEnumWithCustomDomainName)
{
    EXPECT_EQ("value_a", FormatEnum(ECustomDomainName::A));
    EXPECT_EQ("value_b", FormatEnum(ECustomDomainName::B));
}

TEST(TParseEnumTest, ParseUnknown)
{
    EXPECT_EQ(std::nullopt, TryParseEnum<EColor>("yellow"));
    EXPECT_THROW(ParseEnum<EColor>("yellow"), TSimpleException);
    EXPECT_EQ(std::nullopt, TryParseEnum<EColorWithUnknown>("yellow"));
    EXPECT_EQ(EColorWithUnknown::Unknown, TryParseEnum<EColorWithUnknown>("yellow", /*enableUnknown*/ true));
    EXPECT_EQ(EColorWithUnknown::Unknown, ParseEnum<EColorWithUnknown>("yellow"));
    EXPECT_EQ(std::nullopt, TryParseEnum<ELangs>("cpp | haskell"));
    EXPECT_THROW(ParseEnum<ELangs>("cpp | haskell"), TSimpleException);
    EXPECT_EQ(ELangsWithUnknown::Cpp | ELangsWithUnknown::Unknown, TryParseEnum<ELangsWithUnknown>("cpp | haskell", /*enableUnknown*/ true));
    EXPECT_EQ(ELangsWithUnknown::Cpp | ELangsWithUnknown::Unknown, ParseEnum<ELangsWithUnknown>("cpp | haskell"));
}

TEST(TParseEnumTest, ParseEnumWithCustomDomainName)
{
    EXPECT_EQ(ECustomDomainName::A, TryParseEnum<ECustomDomainName>("value_a"));
    EXPECT_EQ(ECustomDomainName::B, TryParseEnum<ECustomDomainName>("value_b"));
    EXPECT_EQ(std::nullopt, TryParseEnum<ECustomDomainName>("b"));
}

TEST(TParseEnumTest, ParseBitEnum)
{
    EXPECT_EQ(ELangs::None, TryParseEnum<ELangs>(""));
    EXPECT_EQ(ELangs::Cpp, TryParseEnum<ELangs>("cpp"));
    EXPECT_EQ(ELangs::Cpp | ELangs::Rust, TryParseEnum<ELangs>("cpp|rust"));
    EXPECT_EQ(ELangs::Cpp | ELangs::Rust, TryParseEnum<ELangs>("cpp | rust"));
    EXPECT_EQ(std::nullopt, TryParseEnum<ELangs>("haskell | rust"));
}

////////////////////////////////////////////////////////////////////////////////

} // namespace
} // namespace NYT