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use libc::{c_char, c_int, c_long, c_ulong, c_ulonglong, size_t};

use crate::object::*;
use crate::pyport::Py_ssize_t;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct PyIntObject {
    #[cfg(py_sys_config = "Py_TRACE_REFS")]
    pub _ob_next: *mut PyObject,
    #[cfg(py_sys_config = "Py_TRACE_REFS")]
    pub _ob_prev: *mut PyObject,
    pub ob_refcnt: Py_ssize_t,
    pub ob_type: *mut PyTypeObject,
    pub ob_ival: c_long,
}

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

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

#[inline(always)]
pub unsafe fn PyInt_CheckExact(op: *mut PyObject) -> c_int {
    let u: *mut PyTypeObject = &mut PyInt_Type;
    (Py_TYPE(op) == u) as c_int
}

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub fn PyInt_FromString(str: *mut c_char, pend: *mut *mut c_char, base: c_int)
        -> *mut PyObject;
    #[cfg(py_sys_config = "Py_USING_UNICODE")]
    pub fn PyInt_FromUnicode(
        u: *mut crate::unicodeobject::Py_UNICODE,
        length: Py_ssize_t,
        base: c_int,
    ) -> *mut PyObject;
    pub fn PyInt_FromLong(ival: c_long) -> *mut PyObject;
    pub fn PyInt_FromSize_t(ival: size_t) -> *mut PyObject;
    pub fn PyInt_FromSsize_t(ival: Py_ssize_t) -> *mut PyObject;
    pub fn PyInt_AsLong(io: *mut PyObject) -> c_long;
    pub fn PyInt_AsSsize_t(io: *mut PyObject) -> Py_ssize_t;
    fn _PyInt_AsInt(io: *mut PyObject) -> c_int;
    pub fn PyInt_AsUnsignedLongMask(io: *mut PyObject) -> c_ulong;
    pub fn PyInt_AsUnsignedLongLongMask(io: *mut PyObject) -> c_ulonglong;
    pub fn PyInt_GetMax() -> c_long;
    ignore! {
        fn PyOS_strtoul(arg1: *mut c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_ulong;
        fn PyOS_strtol(arg1: *mut c_char, arg2: *mut *mut c_char, arg3: c_int) -> c_long;
    }
    pub fn PyInt_ClearFreeList() -> c_int;
    ignore! {
        fn _PyInt_Format(v: *mut PyIntObject, base: c_int, newstyle: c_int) -> *mut PyObject;
        fn _PyInt_FormatAdvanced(
            obj: *mut PyObject,
            format_spec: *mut c_char,
            format_spec_len: Py_ssize_t,
        ) -> *mut PyObject;
    }
}

pub unsafe fn PyInt_AS_LONG(io: *mut PyObject) -> c_long {
    (*(io as *mut PyIntObject)).ob_ival
}