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

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

#[inline]
pub unsafe fn PyObject_DelAttrString(o: *mut PyObject, attr_name: *const c_char) -> c_int {
    PyObject_SetAttrString(o, attr_name, ptr::null_mut())
}

#[inline]
pub unsafe fn PyObject_DelAttr(o: *mut PyObject, attr_name: *mut PyObject) -> c_int {
    PyObject_SetAttr(o, attr_name, ptr::null_mut())
}

#[cfg_attr(windows, link(name = "pythonXY"))]
extern "C" {
    pub fn PyObject_Cmp(o1: *mut PyObject, o2: *mut PyObject, result: *mut c_int) -> c_int;
    pub fn PyObject_Call(
        callable_object: *mut PyObject,
        args: *mut PyObject,
        kw: *mut PyObject,
    ) -> *mut PyObject;
    pub fn PyObject_CallObject(
        callable_object: *mut PyObject,
        args: *mut PyObject,
    ) -> *mut PyObject;
    pub fn PyObject_CallFunction(
        callable_object: *mut PyObject,
        format: *mut c_char,
        ...
    ) -> *mut PyObject;
    pub fn PyObject_CallMethod(
        o: *mut PyObject,
        m: *mut c_char,
        format: *mut c_char,
        ...
    ) -> *mut PyObject;
    fn _PyObject_CallFunction_SizeT(
        callable: *mut PyObject,
        format: *mut c_char,
        ...
    ) -> *mut PyObject;
    fn _PyObject_CallMethod_SizeT(
        o: *mut PyObject,
        name: *mut c_char,
        format: *mut c_char,
        ...
    ) -> *mut PyObject;
    pub fn PyObject_CallFunctionObjArgs(callable: *mut PyObject, ...) -> *mut PyObject;
    pub fn PyObject_CallMethodObjArgs(o: *mut PyObject, m: *mut PyObject, ...) -> *mut PyObject;
    pub fn PyObject_Type(o: *mut PyObject) -> *mut PyObject;
    pub fn PyObject_Size(o: *mut PyObject) -> Py_ssize_t;
    pub fn _PyObject_LengthHint(o: *mut PyObject, arg1: Py_ssize_t) -> Py_ssize_t;
    pub fn PyObject_GetItem(o: *mut PyObject, key: *mut PyObject) -> *mut PyObject;
    pub fn PyObject_SetItem(o: *mut PyObject, key: *mut PyObject, v: *mut PyObject) -> c_int;
    pub fn PyObject_DelItemString(o: *mut PyObject, key: *mut c_char) -> c_int;
    pub fn PyObject_DelItem(o: *mut PyObject, key: *mut PyObject) -> c_int;
    pub fn PyObject_AsCharBuffer(
        obj: *mut PyObject,
        buffer: *mut *const c_char,
        buffer_len: *mut Py_ssize_t,
    ) -> c_int;
    pub fn PyObject_CheckReadBuffer(obj: *mut PyObject) -> c_int;
    pub fn PyObject_AsReadBuffer(
        obj: *mut PyObject,
        buffer: *mut *const c_void,
        buffer_len: *mut Py_ssize_t,
    ) -> c_int;
    pub fn PyObject_AsWriteBuffer(
        obj: *mut PyObject,
        buffer: *mut *mut c_void,
        buffer_len: *mut Py_ssize_t,
    ) -> c_int;

    pub fn PyObject_GetBuffer(obj: *mut PyObject, view: *mut Py_buffer, flags: c_int) -> c_int;

    pub fn PyBuffer_GetPointer(view: *mut Py_buffer, indices: *mut Py_ssize_t) -> *mut c_void;
    pub fn PyBuffer_ToContiguous(
        buf: *mut c_void,
        view: *mut Py_buffer,
        len: Py_ssize_t,
        fort: c_char,
    ) -> c_int;
    pub fn PyBuffer_FromContiguous(
        view: *mut Py_buffer,
        buf: *mut c_void,
        len: Py_ssize_t,
        fort: c_char,
    ) -> c_int;
    pub fn PyObject_CopyData(dest: *mut PyObject, src: *mut PyObject) -> c_int;
    pub fn PyBuffer_IsContiguous(view: *mut Py_buffer, fort: c_char) -> c_int;
    pub fn PyBuffer_FillContiguousStrides(
        ndims: c_int,
        shape: *mut Py_ssize_t,
        strides: *mut Py_ssize_t,
        itemsize: c_int,
        fort: c_char,
    );
    pub fn PyBuffer_FillInfo(
        view: *mut Py_buffer,
        o: *mut PyObject,
        buf: *mut c_void,
        len: Py_ssize_t,
        readonly: c_int,
        flags: c_int,
    ) -> c_int;
    pub fn PyBuffer_Release(view: *mut Py_buffer);
    pub fn PyObject_Format(obj: *mut PyObject, format_spec: *mut PyObject) -> *mut PyObject;
    pub fn PyObject_GetIter(arg1: *mut PyObject) -> *mut PyObject;
    pub fn PyIter_Next(arg1: *mut PyObject) -> *mut PyObject;
    fn _PyObject_NextNotImplemented(arg1: *mut PyObject) -> *mut PyObject;

    pub fn PyNumber_Check(o: *mut PyObject) -> c_int;
    pub fn PyNumber_Add(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Subtract(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Multiply(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Divide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_FloorDivide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_TrueDivide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Remainder(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Divmod(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Power(o1: *mut PyObject, o2: *mut PyObject, o3: *mut PyObject)
        -> *mut PyObject;
    pub fn PyNumber_Negative(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Positive(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Absolute(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Invert(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Lshift(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Rshift(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_And(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Xor(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Or(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Index(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_AsSsize_t(o: *mut PyObject, exc: *mut PyObject) -> Py_ssize_t;
    fn _PyNumber_ConvertIntegralToInt(
        integral: *mut PyObject,
        error_format: *const c_char,
    ) -> *mut PyObject;
    pub fn PyNumber_Int(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Long(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_Float(o: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceAdd(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceSubtract(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceMultiply(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceDivide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceFloorDivide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceTrueDivide(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceRemainder(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlacePower(
        o1: *mut PyObject,
        o2: *mut PyObject,
        o3: *mut PyObject,
    ) -> *mut PyObject;
    pub fn PyNumber_InPlaceLshift(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceRshift(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceAnd(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceXor(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_InPlaceOr(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PyNumber_ToBase(n: *mut PyObject, base: c_int) -> *mut PyObject;
    pub fn PySequence_Check(o: *mut PyObject) -> c_int;
    pub fn PySequence_Size(o: *mut PyObject) -> Py_ssize_t;
    pub fn PySequence_Length(o: *mut PyObject) -> Py_ssize_t;
    pub fn PySequence_Concat(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PySequence_Repeat(o: *mut PyObject, count: Py_ssize_t) -> *mut PyObject;
    pub fn PySequence_GetItem(o: *mut PyObject, i: Py_ssize_t) -> *mut PyObject;
    pub fn PySequence_GetSlice(o: *mut PyObject, i1: Py_ssize_t, i2: Py_ssize_t) -> *mut PyObject;
    pub fn PySequence_SetItem(o: *mut PyObject, i: Py_ssize_t, v: *mut PyObject) -> c_int;
    pub fn PySequence_DelItem(o: *mut PyObject, i: Py_ssize_t) -> c_int;
    pub fn PySequence_SetSlice(
        o: *mut PyObject,
        i1: Py_ssize_t,
        i2: Py_ssize_t,
        v: *mut PyObject,
    ) -> c_int;
    pub fn PySequence_DelSlice(o: *mut PyObject, i1: Py_ssize_t, i2: Py_ssize_t) -> c_int;
    pub fn PySequence_Tuple(o: *mut PyObject) -> *mut PyObject;
    pub fn PySequence_List(o: *mut PyObject) -> *mut PyObject;
    pub fn PySequence_Fast(o: *mut PyObject, m: *const c_char) -> *mut PyObject;
    pub fn PySequence_Count(o: *mut PyObject, value: *mut PyObject) -> Py_ssize_t;
    pub fn PySequence_Contains(seq: *mut PyObject, ob: *mut PyObject) -> c_int;
    pub fn _PySequence_IterSearch(
        seq: *mut PyObject,
        obj: *mut PyObject,
        operation: c_int,
    ) -> Py_ssize_t;
    pub fn PySequence_In(o: *mut PyObject, value: *mut PyObject) -> c_int;
    pub fn PySequence_Index(o: *mut PyObject, value: *mut PyObject) -> Py_ssize_t;
    pub fn PySequence_InPlaceConcat(o1: *mut PyObject, o2: *mut PyObject) -> *mut PyObject;
    pub fn PySequence_InPlaceRepeat(o: *mut PyObject, count: Py_ssize_t) -> *mut PyObject;
    pub fn PyMapping_Check(o: *mut PyObject) -> c_int;
    pub fn PyMapping_Size(o: *mut PyObject) -> Py_ssize_t;
    pub fn PyMapping_Length(o: *mut PyObject) -> Py_ssize_t;
    pub fn PyMapping_HasKeyString(o: *mut PyObject, key: *mut c_char) -> c_int;
    pub fn PyMapping_HasKey(o: *mut PyObject, key: *mut PyObject) -> c_int;
    pub fn PyMapping_GetItemString(o: *mut PyObject, key: *mut c_char) -> *mut PyObject;
    pub fn PyMapping_SetItemString(
        o: *mut PyObject,
        key: *mut c_char,
        value: *mut PyObject,
    ) -> c_int;
    pub fn PyObject_IsInstance(object: *mut PyObject, typeorclass: *mut PyObject) -> c_int;
    pub fn PyObject_IsSubclass(object: *mut PyObject, typeorclass: *mut PyObject) -> c_int;
}

#[inline]
pub unsafe fn PyObject_CheckBuffer(obj: *mut PyObject) -> c_int {
    let t = (*obj).ob_type;
    let b = (*t).tp_as_buffer;
    (!b.is_null()
        && (PyType_HasFeature(t, Py_TPFLAGS_HAVE_NEWBUFFER) != 0)
        && ((*b).bf_getbuffer.is_some())) as c_int
}

#[inline]
pub unsafe fn PyIter_Check(obj: *mut PyObject) -> c_int {
    let t = (*obj).ob_type;
    (PyType_HasFeature(t, Py_TPFLAGS_HAVE_ITER) != 0
        && match (*t).tp_iternext {
            None => false,
            Some(f) => f as *const c_void != _PyObject_NextNotImplemented as *const c_void,
        }) as c_int
}

#[inline]
pub unsafe fn PyIndex_Check(obj: *mut PyObject) -> c_int {
    let t = (*obj).ob_type;
    let n = (*t).tp_as_number;
    (!n.is_null() && PyType_HasFeature(t, Py_TPFLAGS_HAVE_INDEX) != 0 && (*n).nb_index.is_some())
        as c_int
}

#[inline]
pub unsafe fn PySequence_Fast_GET_SIZE(o: *mut PyObject) -> Py_ssize_t {
    if crate::listobject::PyList_Check(o) != 0 {
        crate::listobject::PyList_GET_SIZE(o)
    } else {
        crate::tupleobject::PyTuple_GET_SIZE(o)
    }
}

#[inline]
pub unsafe fn PySequence_Fast_GET_ITEM(o: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
    if crate::listobject::PyList_Check(o) != 0 {
        crate::listobject::PyList_GET_ITEM(o, i)
    } else {
        crate::tupleobject::PyTuple_GET_ITEM(o, i)
    }
}

#[inline]
pub unsafe fn PySequence_Fast_ITEMS(o: *mut PyObject) -> *mut *mut PyObject {
    if crate::listobject::PyList_Check(o) != 0 {
        (*(o as *mut crate::listobject::PyListObject)).ob_item
    } else {
        (*(o as *mut crate::tupleobject::PyTupleObject))
            .ob_item
            .as_mut_ptr()
    }
}

#[inline]
pub unsafe fn PySequence_ITEM(o: *mut PyObject, i: Py_ssize_t) -> *mut PyObject {
    (*(*Py_TYPE(o)).tp_as_sequence).sq_item.unwrap()(o, i)
}

pub const PY_ITERSEARCH_COUNT: c_int = 1;
pub const PY_ITERSEARCH_INDEX: c_int = 2;
pub const PY_ITERSEARCH_CONTAINS: c_int = 3;

#[inline]
pub unsafe fn PyMapping_DelItemString(o: *mut PyObject, key: *mut c_char) -> c_int {
    PyObject_DelItemString(o, key)
}

#[inline]
pub unsafe fn PyMapping_DelItem(o: *mut PyObject, key: *mut PyObject) -> c_int {
    PyObject_DelItem(o, key)
}

#[inline]
pub unsafe fn PyMapping_Keys(o: *mut PyObject) -> *mut PyObject {
    PyObject_CallMethod(o, "keys\0".as_ptr() as *mut _, ptr::null_mut())
}

#[inline]
pub unsafe fn PyMapping_Values(o: *mut PyObject) -> *mut PyObject {
    PyObject_CallMethod(o, "values\0".as_ptr() as *mut _, ptr::null_mut())
}

#[inline]
pub unsafe fn PyMapping_Items(o: *mut PyObject) -> *mut PyObject {
    PyObject_CallMethod(o, "items\0".as_ptr() as *mut _, ptr::null_mut())
}