use libc::{c_char, c_int};
use core::{mem, ptr};
use object::{PyObject, PyTypeObject, Py_TYPE};

#[cfg_attr(windows, link(name="pythonXY"))] extern "C" {
    pub static mut PyCFunction_Type: PyTypeObject;
}

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

pub type PyCFunction =
    unsafe extern "C" fn
                              (slf: *mut PyObject, args: *mut PyObject)
                              -> *mut PyObject;

#[cfg(all(Py_3_6, not(Py_LIMITED_API), not(Py_3_7)))]
pub type _PyCFunctionFast =
    unsafe extern "C" fn
                              (slf: *mut PyObject, args: *mut *mut PyObject,
                               nargs: ::pyport::Py_ssize_t, kwnames: *mut PyObject)
                              -> *mut PyObject;

#[cfg(all(Py_3_7, not(Py_LIMITED_API)))]
pub type _PyCFunctionFast =
    unsafe extern "C" fn(
        slf: *mut PyObject,
        args: *const *mut PyObject, nargs: ::pyport::Py_ssize_t
    ) -> *mut PyObject;

pub type PyCFunctionWithKeywords =
    unsafe extern "C" fn
                              (slf: *mut PyObject, args: *mut PyObject,
                               kwds: *mut PyObject) -> *mut PyObject;

#[cfg(all(Py_3_7, not(Py_LIMITED_API)))]
pub type _PyCFunctionFastWithKeywords =
    unsafe extern "C" fn(
        slf: *mut PyObject,
        args: *const *mut PyObject, nargs: ::pyport::Py_ssize_t,
        kwnames: *mut PyObject
    ) -> *mut PyObject;

pub type PyNoArgsFunction =
    unsafe extern "C" fn(slf: *mut PyObject)
                              -> *mut PyObject;

#[cfg_attr(windows, link(name="pythonXY"))] extern "C" {
    pub fn PyCFunction_GetFunction(f: *mut PyObject) -> Option<PyCFunction>;
    pub fn PyCFunction_GetSelf(f: *mut PyObject) -> *mut PyObject;
    pub fn PyCFunction_GetFlags(f: *mut PyObject) -> c_int;
    pub fn PyCFunction_Call(f: *mut PyObject, args: *mut PyObject,
                            kwds: *mut PyObject) -> *mut PyObject;
}

#[repr(C)]
#[derive(Copy)]
pub struct PyMethodDef {
    pub ml_name: *const c_char,
    pub ml_meth: Option<PyCFunction>,
    pub ml_flags: c_int,
    pub ml_doc: *const c_char,
}

impl Clone for PyMethodDef {
    #[inline] fn clone(&self) -> PyMethodDef { *self }
}
impl Default for PyMethodDef {
    fn default() -> PyMethodDef { unsafe { mem::zeroed() } }
}

#[inline(always)]
pub unsafe fn PyCFunction_New(ml: *mut PyMethodDef, slf: *mut PyObject) -> *mut PyObject {
    PyCFunction_NewEx(ml, slf, ptr::null_mut())
}

#[cfg_attr(windows, link(name="pythonXY"))] extern "C" {
    pub fn PyCFunction_NewEx(arg1: *mut PyMethodDef, arg2: *mut PyObject,
                             arg3: *mut PyObject) -> *mut PyObject;
}

/* Flag passed to newmethodobject */
pub const METH_VARARGS  : c_int = 0x0001;
pub const METH_KEYWORDS : c_int = 0x0002;
/* METH_NOARGS and METH_O must not be combined with the flags above. */
pub const METH_NOARGS   : c_int = 0x0004;
pub const METH_O        : c_int = 0x0008;

/* METH_CLASS and METH_STATIC are a little different; these control
   the construction of methods for a class.  These cannot be used for
   functions in modules. */
pub const METH_CLASS    : c_int = 0x0010;
pub const METH_STATIC   : c_int = 0x0020;

/* METH_COEXIST allows a method to be entered eventhough a slot has
   already filled the entry.  When defined, the flag allows a separate
   method, "__contains__" for example, to coexist with a defined 
   slot like sq_contains. */

pub const METH_COEXIST   : c_int = 0x0040;

#[cfg(all(Py_3_6, not(Py_LIMITED_API)))]
pub const METHOD_FASTCALL : c_int = 0x0080;

#[cfg_attr(windows, link(name="pythonXY"))] extern "C" {
    pub fn PyCFunction_ClearFreeList() -> c_int;
}

