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use crossbeam_utils::atomic::AtomicCell;

use crate::{

AsObject, PyObject, PyObjectRef, PyResult, VirtualMachine,

builtins::{

PyDict, PyStrInterned,

dict::{PyDictItems, PyDictKeys, PyDictValues},

convert::ToPyResult,

object::{Traverse, TraverseFn},

};

/// [Mapping protocol](https://docs.python.org/3/c-api/mapping.html)

#[expect(clippy::type_complexity)]

#[derive(Default)]

pub struct PyMappingSlots {

pub length: AtomicCell<Option<fn(PyMapping<'_>, &VirtualMachine) -> PyResult<usize>>>,

pub subscript: AtomicCell<Option<fn(PyMapping<'_>, &PyObject, &VirtualMachine) -> PyResult>>,

pub ass_subscript: AtomicCell<

Option<fn(PyMapping<'_>, &PyObject, Option<PyObjectRef>, &VirtualMachine) -> PyResult<()>>,

}

impl core::fmt::Debug for PyMappingSlots {

fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {

f.write_str("PyMappingSlots")

}

impl PyMappingSlots {

#[must_use]

pub fn has_subscript(&self) -> bool {

self.subscript.load().is_some()

}

/// Copy from static [`PyMappingMethods`].

pub fn copy_from(&self, methods: &PyMappingMethods) {

if let Some(f) = methods.length {

self.length.store(Some(f));

}

if let Some(f) = methods.subscript {

self.subscript.store(Some(f));

}

if let Some(f) = methods.ass_subscript {

self.ass_subscript.store(Some(f));

}

#[expect(clippy::type_complexity)]

#[derive(Default)]

pub struct PyMappingMethods {

pub length: Option<fn(PyMapping<'_>, &VirtualMachine) -> PyResult<usize>>,

pub subscript: Option<fn(PyMapping<'_>, &PyObject, &VirtualMachine) -> PyResult>,

pub ass_subscript:

Option<fn(PyMapping<'_>, &PyObject, Option<PyObjectRef>, &VirtualMachine) -> PyResult<()>>,

}

impl core::fmt::Debug for PyMappingMethods {

fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {

f.write_str("PyMappingMethods")

}

impl PyMappingMethods {

pub const NOT_IMPLEMENTED: Self = Self {

length: None,

subscript: None,

ass_subscript: None,

};

}

impl PyObject {

#[must_use]

pub const fn mapping_unchecked(&self) -> PyMapping<'_> {

PyMapping { obj: self }

}

pub fn try_mapping(&self, vm: &VirtualMachine) -> PyResult<PyMapping<'_>> {

let mapping = self.mapping_unchecked();

if mapping.check() {

Ok(mapping)

} else {

Err(vm.new_type_error(format!(

"{} is not a mapping object",

self.class().slot_name()

)))

}

#[derive(Copy, Clone)]

pub struct PyMapping<'a> {

pub obj: &'a PyObject,

}

unsafe impl Traverse for PyMapping<'_> {

fn traverse(&self, tracer_fn: &mut TraverseFn<'_>) {

self.obj.traverse(tracer_fn)

}

impl AsRef<PyObject> for PyMapping<'_> {

#[inline(always)]

fn as_ref(&self) -> &PyObject {

self.obj

}

impl PyMapping<'_> {

#[inline]

#[must_use]

pub fn slots(&self) -> &PyMappingSlots {

&self.obj.class().slots.as_mapping

}

#[inline]

#[must_use]

pub fn check(&self) -> bool {

self.slots().has_subscript()

}

pub fn length_opt(self, vm: &VirtualMachine) -> Option<PyResult<usize>> {

self.slots().length.load().map(|f| f(self, vm))

}

// Py_ssize_t PyMapping_Size(PyObject *o)

pub fn length(self, vm: &VirtualMachine) -> PyResult<usize> {

self.length_opt(vm).ok_or_else(|| {

let name = self.obj.class().slot_name();

// Something that measures itself as a sequence is no mapping at all.

let msg = if self

.obj

.sequence_unchecked()

.slots()

.length

.load()

.is_some()

{

format!("{name} is not a mapping")

} else {

format!("object of type '{name}' has no len()")

};

vm.new_type_error(msg)

})?

}

pub fn subscript(self, needle: &impl AsObject, vm: &VirtualMachine) -> PyResult {

self._subscript(needle.as_object(), vm)

}

pub fn ass_subscript(

self,

needle: &impl AsObject,

value: Option<PyObjectRef>,

vm: &VirtualMachine,

) -> PyResult<()> {

self._ass_subscript(needle.as_object(), value, vm)

}

fn _subscript(self, needle: &PyObject, vm: &VirtualMachine) -> PyResult {

let f = self.slots().subscript.load().ok_or_else(|| {

vm.new_type_error(format!("{} is not a mapping", self.obj.class().slot_name()))

})?;

f(self, needle, vm)

}

fn _ass_subscript(

self,

needle: &PyObject,

value: Option<PyObjectRef>,

vm: &VirtualMachine,

) -> PyResult<()> {

let f = self.slots().ass_subscript.load().ok_or_else(|| {

vm.new_type_error(format!(

"'{}' object does not support item assignment",

self.obj.class().slot_name()

))

})?;

f(self, needle, value, vm)

}

pub fn keys(self, vm: &VirtualMachine) -> PyResult {

if let Some(dict) = self.obj.downcast_ref_if_exact::<PyDict>(vm) {

PyDictKeys::new(dict.to_owned()).to_pyresult(vm)

} else {

self.method_output_as_list(identifier!(vm, keys), vm)

}

pub fn values(self, vm: &VirtualMachine) -> PyResult {

if let Some(dict) = self.obj.downcast_ref_if_exact::<PyDict>(vm) {

PyDictValues::new(dict.to_owned()).to_pyresult(vm)

} else {

self.method_output_as_list(identifier!(vm, values), vm)

}

pub fn items(self, vm: &VirtualMachine) -> PyResult {

if let Some(dict) = self.obj.downcast_ref_if_exact::<PyDict>(vm) {

PyDictItems::new(dict.to_owned()).to_pyresult(vm)

} else {

self.method_output_as_list(identifier!(vm, items), vm)

}

fn method_output_as_list(

self,

method_name: &'static PyStrInterned,

vm: &VirtualMachine,

) -> PyResult {

let meth_output = vm.call_method(self.obj, method_name.as_str(), ())?;

if meth_output.is(vm.ctx.types.list_type) {

return Ok(meth_output);

}

let iter = meth_output.get_iter(vm).map_err(|_| {

vm.new_type_error(format!(

"{}.{}() returned a non-iterable (type {})",

self.obj.class().slot_name(),

method_name.as_str(),

meth_output.class().slot_name()

))

})?;

// TODO

// PySequence::from(&iter).list(vm).map(|x| x.into())

vm.ctx.new_list(iter.try_to_value(vm)?).to_pyresult(vm)

}

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