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#pragma once

#include "duckdb_python/nb/casters.hpp"

#include "duckdb_python/pyutil.hpp"

#include "duckdb/common/types/time.hpp"

#include "duckdb/common/types/date.hpp"

#include "duckdb/common/types/timestamp.hpp"

#include "duckdb/common/types/interval.hpp"

#include "duckdb/common/types/value.hpp"

#include "duckdb/common/types/cast_helpers.hpp"

#include "duckdb/main/client_properties.hpp"

#include "datetime.h" //from python

/* Backport for Python < 3.10 */

#if PY_VERSION_HEX < 0x030a00a1

#ifndef PyDateTime_TIME_GET_TZINFO

#define PyDateTime_TIME_GET_TZINFO(o) ((((PyDateTime_Time *)o)->hastzinfo) ? ((PyDateTime_Time *)o)->tzinfo : Py_None)

#endif

#ifndef PyDateTime_DATE_GET_TZINFO

#define PyDateTime_DATE_GET_TZINFO(o) \

((((PyDateTime_DateTime *)o)->hastzinfo) ? ((PyDateTime_DateTime *)o)->tzinfo : Py_None)

#endif

namespace duckdb {

struct PyDictionary {

public:

PyDictionary(nb::object dict);

// These are cached so we don't have to create new objects all the time

// The CPython API offers PyDict_Keys but that creates a new reference every time, same for values

nb::object keys;

nb::object values;

idx_t len;

public:

nb::handle operator[](const nb::object &obj) const {

return PyDict_GetItem(dict.ptr(), obj.ptr());

}

public:

string ToString() const {

return nb::cast<std::string>(nb::str(dict));

}

private:

nb::object dict;

};

enum class PyDecimalExponentType {

EXPONENT_SCALE, //! Amount of digits after the decimal point

EXPONENT_POWER, //! How many zeros behind the decimal point

EXPONENT_INFINITY, //! Decimal is INFINITY

EXPONENT_NAN //! Decimal is NAN

};

struct PyDecimal {

struct PyDecimalScaleConverter {

template <typename T, typename = std::enable_if<std::numeric_limits<T>::is_integer, T>>

static Value Operation(bool signed_value, vector<uint8_t> &digits, uint8_t width, uint8_t scale) {

T value = 0;

for (auto it = digits.begin(); it != digits.end(); it++) {

value = value * 10 + *it;

}

if (signed_value) {

value = -value;

}

return Value::DECIMAL(value, width, scale);

}

};

struct PyDecimalPowerConverter {

template <typename T, typename = std::enable_if<std::numeric_limits<T>::is_integer, T>>

static Value Operation(bool signed_value, vector<uint8_t> &digits, uint8_t width, uint8_t scale) {

T value = 0;

for (auto &digit : digits) {

value = value * 10 + digit;

}

D_ASSERT(scale >= 0);

int64_t multiplier =

NumericHelper::POWERS_OF_TEN[MinValue<uint8_t>(scale, NumericHelper::CACHED_POWERS_OF_TEN - 1)];

for (auto power = scale; power > NumericHelper::CACHED_POWERS_OF_TEN; power--) {

multiplier *= 10;

}

value *= multiplier;

if (signed_value) {

value = -value;

}

return Value::DECIMAL(value, width, scale);

}

};

public:

PyDecimal(nb::handle &obj);

vector<uint8_t> digits;

bool signed_value = false;

PyDecimalExponentType exponent_type;

int32_t exponent_value;

public:

bool TryGetType(LogicalType &type);

Value ToDuckValue();

private:

void SetExponent(nb::handle &exponent);

nb::handle &obj;

};

struct PyTimeDelta {

public:

PyTimeDelta(nb::handle &obj);

int32_t days;

int32_t seconds;

int64_t microseconds;

public:

interval_t ToInterval();

private:

static int64_t GetDays(nb::handle &obj);

static int64_t GetSeconds(nb::handle &obj);

static int64_t GetMicros(nb::handle &obj);

};

struct PyTime {

public:

PyTime(nb::handle &obj);

nb::handle &obj;

int32_t hour;

int32_t minute;

int32_t second;

int32_t microsecond;

nb::object timezone_obj;

public:

dtime_t ToDuckTime();

Value ToDuckValue();

private:

static int32_t GetHours(nb::handle &obj);

static int32_t GetMinutes(nb::handle &obj);

static int32_t GetSeconds(nb::handle &obj);

static int32_t GetMicros(nb::handle &obj);

static nb::object GetTZInfo(nb::handle &obj);

};

struct PyDateTime {

public:

PyDateTime(nb::handle &obj);

nb::handle &obj;

int32_t year;

int32_t month;

int32_t day;

int32_t hour;

int32_t minute;

int32_t second;

int32_t micros;

nb::object tzone_obj;

public:

timestamp_t ToTimestamp();

date_t ToDate();

dtime_t ToDuckTime();

Value ToDuckValue(const LogicalType &target_type);

public:

static int32_t GetYears(nb::handle &obj);

static int32_t GetMonths(nb::handle &obj);

static int32_t GetDays(nb::handle &obj);

static int32_t GetHours(nb::handle &obj);

static int32_t GetMinutes(nb::handle &obj);

static int32_t GetSeconds(nb::handle &obj);

static int32_t GetMicros(nb::handle &obj);

static nb::object GetTZInfo(nb::handle &obj);

};

struct PyDate {

public:

PyDate(nb::handle &ele);

int32_t year;

int32_t month;

int32_t day;

public:

date_t ToDate();

Value ToDuckValue();

};

struct PyTimezone {

public:

PyTimezone() = delete;

public:

DUCKDB_API static int32_t GetUTCOffsetSeconds(nb::handle &tzone_obj);

DUCKDB_API static interval_t GetUTCOffset(nb::handle &datetime, nb::handle &tzone_obj);

};

struct PythonObject {

static void Initialize();

static nb::object FromStruct(const Value &value, const LogicalType &id, const ClientProperties &client_properties);

static nb::object FromValue(const Value &value, const LogicalType &id, const ClientProperties &client_properties);

};

template <class T>

class Optional : public nb::object {

public:

Optional(const nb::object &o) : nb::object(o, nb::detail::borrow_t {}) {

}

using nb::object::object;

public:

static bool check_(const nb::handle &object) {

return object.is_none() || nb::isinstance<T>(object);

}

};

class FileLikeObject : public nb::object {

public:

FileLikeObject(const nb::object &o) : nb::object(o, nb::detail::borrow_t {}) {

}

using nb::object::object;

public:

static bool check_(const nb::handle &object) {

return duckdb::PyUtil::IsInstance(object, nb::module_::import_("io").attr("IOBase"));

}

};

} // namespace duckdb

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