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use libc::{c_char, c_int, c_void};

use crate::methodobject::PyMethodDef;
use crate::object::{PyObject, PyTypeObject, Py_TYPE};
use crate::structmember::PyMemberDef;

pub type getter = unsafe extern "C" fn(slf: *mut PyObject, closure: *mut c_void) -> *mut PyObject;

pub type setter =
    unsafe extern "C" fn(slf: *mut PyObject, value: *mut PyObject, closure: *mut c_void) -> c_int;

#[repr(C)]
#[derive(Copy)]
pub struct PyGetSetDef {
    pub name: *mut c_char,
    pub get: Option<getter>,
    pub set: Option<setter>,
    pub doc: *mut c_char,
    pub closure: *mut c_void,
}

impl Clone for PyGetSetDef {
    #[inline]
    fn clone(&self) -> PyGetSetDef {
        *self
    }
}

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

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

#[repr(C)]
#[derive(Copy)]
pub struct wrapperbase {
    pub name: *mut c_char,
    pub offset: c_int,
    pub function: *mut c_void,
    pub wrapper: Option<wrapperfunc>,
    pub doc: *mut c_char,
    pub flags: c_int,
    pub name_strobj: *mut PyObject,
}

impl Clone for wrapperbase {
    #[inline]
    fn clone(&self) -> wrapperbase {
        *self
    }
}

pub const PyWrapperFlag_KEYWORDS: c_int = 1;

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub static mut PyWrapperDescr_Type: PyTypeObject;
    pub static mut PyDictProxy_Type: PyTypeObject;
    pub static mut PyGetSetDescr_Type: PyTypeObject;
    pub static mut PyMemberDescr_Type: PyTypeObject;
    pub static mut PyProperty_Type: PyTypeObject;

    pub fn PyDescr_NewMethod(arg1: *mut PyTypeObject, arg2: *mut PyMethodDef) -> *mut PyObject;
    pub fn PyDescr_NewClassMethod(arg1: *mut PyTypeObject, arg2: *mut PyMethodDef)
        -> *mut PyObject;
    pub fn PyDescr_NewMember(arg1: *mut PyTypeObject, arg2: *mut PyMemberDef) -> *mut PyObject;
    pub fn PyDescr_NewGetSet(arg1: *mut PyTypeObject, arg2: *mut PyGetSetDef) -> *mut PyObject;
    pub fn PyDescr_NewWrapper(
        arg1: *mut PyTypeObject,
        arg2: *mut wrapperbase,
        arg3: *mut c_void,
    ) -> *mut PyObject;
}

#[inline(always)]
pub unsafe fn PyDescr_IsData(d: *mut PyObject) -> c_int {
    (*Py_TYPE(d)).tp_descr_set.is_some() as c_int
}

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    ignore! {
        // PyDictProxy_New is also defined in dictobject.h
        pub fn PyDictProxy_New(arg1: *mut PyObject) -> *mut PyObject;
    }
    pub fn PyWrapper_New(arg1: *mut PyObject, arg2: *mut PyObject) -> *mut PyObject;
}