/*  datetime.h
 */
#ifndef Py_LIMITED_API
#ifndef DATETIME_H
#define DATETIME_H
#ifdef __cplusplus
extern "C" {
#endif

/* Fields are packed into successive bytes, each viewed as unsigned and
 * big-endian, unless otherwise noted:
 *
 * byte offset
 *  0           year     2 bytes, 1-9999
 *  2           month    1 byte, 1-12
 *  3           day      1 byte, 1-31
 *  4           hour     1 byte, 0-23
 *  5           minute   1 byte, 0-59
 *  6           second   1 byte, 0-59
 *  7           usecond  3 bytes, 0-999999
 * 10
 */

/* # of bytes for year, month, and day. */
#define _PyDateTime_DATE_DATASIZE 4

/* # of bytes for hour, minute, second, and usecond. */
#define _PyDateTime_TIME_DATASIZE 6

/* # of bytes for year, month, day, hour, minute, second, and usecond. */
#define _PyDateTime_DATETIME_DATASIZE 10


typedef struct
{
    PyObject_HEAD
    Py_hash_t hashcode;         /* -1 when unknown */
    int days;                   /* -MAX_DELTA_DAYS data[4])
#define PyDateTime_DATE_GET_MINUTE(o)      (((PyDateTime_DateTime*)o)->data[5])
#define PyDateTime_DATE_GET_SECOND(o)      (((PyDateTime_DateTime*)o)->data[6])
#define PyDateTime_DATE_GET_MICROSECOND(o)              \
    ((((PyDateTime_DateTime*)o)->data[7] data[8] data[9])

/* Apply for time instances. */
#define PyDateTime_TIME_GET_HOUR(o)        (((PyDateTime_Time*)o)->data[0])
#define PyDateTime_TIME_GET_MINUTE(o)      (((PyDateTime_Time*)o)->data[1])
#define PyDateTime_TIME_GET_SECOND(o)      (((PyDateTime_Time*)o)->data[2])
#define PyDateTime_TIME_GET_MICROSECOND(o)              \
    ((((PyDateTime_Time*)o)->data[3] data[4] data[5])

/* Apply for time delta instances */
#define PyDateTime_DELTA_GET_DAYS(o)         (((PyDateTime_Delta*)o)->days)
#define PyDateTime_DELTA_GET_SECONDS(o)      (((PyDateTime_Delta*)o)->seconds)
#define PyDateTime_DELTA_GET_MICROSECONDS(o)            \
    (((PyDateTime_Delta*)o)->microseconds)


/* Define structure for C API. */
typedef struct {
    /* type objects */
    PyTypeObject *DateType;
    PyTypeObject *DateTimeType;
    PyTypeObject *TimeType;
    PyTypeObject *DeltaType;
    PyTypeObject *TZInfoType;

    /* constructors */
    PyObject *(*Date_FromDate)(int, int, int, PyTypeObject*);
    PyObject *(*DateTime_FromDateAndTime)(int, int, int, int, int, int, int,
        PyObject*, PyTypeObject*);
    PyObject *(*Time_FromTime)(int, int, int, int, PyObject*, PyTypeObject*);
    PyObject *(*Delta_FromDelta)(int, int, int, int, PyTypeObject*);

    /* constructors for the DB API */
    PyObject *(*DateTime_FromTimestamp)(PyObject*, PyObject*, PyObject*);
    PyObject *(*Date_FromTimestamp)(PyObject*, PyObject*);

} PyDateTime_CAPI;

#define PyDateTime_CAPSULE_NAME "datetime.datetime_CAPI"


#ifdef Py_BUILD_CORE

/* Macros for type checking when building the Python core. */
#define PyDate_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateType)
#define PyDate_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DateType)

#define PyDateTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_DateTimeType)
#define PyDateTime_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DateTimeType)

#define PyTime_Check(op) PyObject_TypeCheck(op, &PyDateTime_TimeType)
#define PyTime_CheckExact(op) (Py_TYPE(op) == &PyDateTime_TimeType)

#define PyDelta_Check(op) PyObject_TypeCheck(op, &PyDateTime_DeltaType)
#define PyDelta_CheckExact(op) (Py_TYPE(op) == &PyDateTime_DeltaType)

#define PyTZInfo_Check(op) PyObject_TypeCheck(op, &PyDateTime_TZInfoType)
#define PyTZInfo_CheckExact(op) (Py_TYPE(op) == &PyDateTime_TZInfoType)

#else

/* Define global variable for the C API and a macro for setting it. */
static PyDateTime_CAPI *PyDateTimeAPI = NULL;

#define PyDateTime_IMPORT \
    PyDateTimeAPI = (PyDateTime_CAPI *)PyCapsule_Import(PyDateTime_CAPSULE_NAME, 0)

/* Macros for type checking when not building the Python core. */
#define PyDate_Check(op) PyObject_TypeCheck(op, PyDateTimeAPI->DateType)
#define PyDate_CheckExact(op) (Py_TYPE(op) == PyDateTimeAPI->DateType)

#define PyDateTime_Check(op) PyObject_TypeCheck(op, PyDateTimeAPI->DateTimeType)
#define PyDateTime_CheckExact(op) (Py_TYPE(op) == PyDateTimeAPI->DateTimeType)

#define PyTime_Check(op) PyObject_TypeCheck(op, PyDateTimeAPI->TimeType)
#define PyTime_CheckExact(op) (Py_TYPE(op) == PyDateTimeAPI->TimeType)

#define PyDelta_Check(op) PyObject_TypeCheck(op, PyDateTimeAPI->DeltaType)
#define PyDelta_CheckExact(op) (Py_TYPE(op) == PyDateTimeAPI->DeltaType)

#define PyTZInfo_Check(op) PyObject_TypeCheck(op, PyDateTimeAPI->TZInfoType)
#define PyTZInfo_CheckExact(op) (Py_TYPE(op) == PyDateTimeAPI->TZInfoType)

/* Macros for accessing constructors in a simplified fashion. */
#define PyDate_FromDate(year, month, day) \
    PyDateTimeAPI->Date_FromDate(year, month, day, PyDateTimeAPI->DateType)

#define PyDateTime_FromDateAndTime(year, month, day, hour, min, sec, usec) \
    PyDateTimeAPI->DateTime_FromDateAndTime(year, month, day, hour, \
        min, sec, usec, Py_None, PyDateTimeAPI->DateTimeType)

#define PyTime_FromTime(hour, minute, second, usecond) \
    PyDateTimeAPI->Time_FromTime(hour, minute, second, usecond, \
        Py_None, PyDateTimeAPI->TimeType)

#define PyDelta_FromDSU(days, seconds, useconds) \
    PyDateTimeAPI->Delta_FromDelta(days, seconds, useconds, 1, \
        PyDateTimeAPI->DeltaType)

/* Macros supporting the DB API. */
#define PyDateTime_FromTimestamp(args) \
    PyDateTimeAPI->DateTime_FromTimestamp( \
        (PyObject*) (PyDateTimeAPI->DateTimeType), args, NULL)

#define PyDate_FromTimestamp(args) \
    PyDateTimeAPI->Date_FromTimestamp( \
        (PyObject*) (PyDateTimeAPI->DateType), args)

#endif  /* Py_BUILD_CORE */

#ifdef __cplusplus
}
#endif
#endif
#endif /* !Py_LIMITED_API */