use libc::c_int;
use pyport::Py_ssize_t;
use object::*;

#[repr(C)]
#[cfg(not(Py_LIMITED_API))]
pub struct PyTupleObject {
    pub ob_base: PyVarObject,
    pub ob_item: [*mut PyObject; 1],
}

extern "C" {
    pub static mut PyTuple_Type: PyTypeObject;
    pub static mut PyTupleIter_Type: PyTypeObject;
}

#[inline(always)]
pub unsafe fn PyTuple_Check(op : *mut PyObject) -> c_int {
    PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_TUPLE_SUBCLASS)
}

#[inline(always)]
pub unsafe fn PyTuple_CheckExact(op : *mut PyObject) -> c_int {
    (Py_TYPE(op) == &mut PyTuple_Type) as c_int
}

extern "C" {
    pub fn PyTuple_New(size: Py_ssize_t) -> *mut PyObject;
    pub fn PyTuple_Size(arg1: *mut PyObject) -> Py_ssize_t;
    pub fn PyTuple_GetItem(arg1: *mut PyObject, arg2: Py_ssize_t)
     -> *mut PyObject;
    pub fn PyTuple_SetItem(arg1: *mut PyObject, arg2: Py_ssize_t,
                           arg3: *mut PyObject) -> c_int;
    pub fn PyTuple_GetSlice(arg1: *mut PyObject, arg2: Py_ssize_t,
                            arg3: Py_ssize_t) -> *mut PyObject;
    pub fn PyTuple_Pack(arg1: Py_ssize_t, ...) -> *mut PyObject;
    pub fn PyTuple_ClearFreeList() -> c_int;
}

// Macro, trading safety for speed
#[inline(always)]
#[cfg(not(Py_LIMITED_API))]
pub unsafe fn PyTuple_GET_ITEM(op: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
   *(*(op as *mut PyTupleObject)).ob_item.as_ptr().offset(i as isize)
}

#[inline(always)]
#[cfg(not(Py_LIMITED_API))]
pub unsafe fn PyTuple_GET_SIZE(op: *mut PyObject) -> Py_ssize_t {
    Py_SIZE(op)
}

/// Macro, *only* to be used to fill in brand new tuples
#[inline(always)]
#[cfg(not(Py_LIMITED_API))]
pub unsafe fn PyTuple_SET_ITEM(op: *mut PyObject, i: Py_ssize_t, v: *mut PyObject) {
   *(*(op as *mut PyTupleObject)).ob_item.as_mut_ptr().offset(i as isize) = v;
}