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use crate::lock::{

MapImmutable, PyImmutableMappedMutexGuard, PyMappedMutexGuard, PyMappedRwLockReadGuard,

PyMappedRwLockWriteGuard, PyMutexGuard, PyRwLockReadGuard, PyRwLockWriteGuard,

};

use alloc::fmt;

use core::ops::{Deref, DerefMut};

macro_rules! impl_from {

($lt:lifetime, $gen:ident, $t:ty, $($var:ident($from:ty),)*) => {

impl<$lt, $gen: ?Sized> From<$from> for $t {

fn from(t: $from) -> Self {

Self::$var(t)

}

};

}

#[derive(Debug)]

pub enum BorrowedValue<'a, T: ?Sized> {

Ref(&'a T),

MuLock(PyMutexGuard<'a, T>),

MappedMuLock(PyImmutableMappedMutexGuard<'a, T>),

ReadLock(PyRwLockReadGuard<'a, T>),

MappedReadLock(PyMappedRwLockReadGuard<'a, T>),

}

impl_from!('a, T, BorrowedValue<'a, T>,

Ref(&'a T),

MuLock(PyMutexGuard<'a, T>),

MappedMuLock(PyImmutableMappedMutexGuard<'a, T>),

ReadLock(PyRwLockReadGuard<'a, T>),

MappedReadLock(PyMappedRwLockReadGuard<'a, T>),

);

impl<'a, T: ?Sized> BorrowedValue<'a, T> {

pub fn map<U: ?Sized, F>(s: Self, f: F) -> BorrowedValue<'a, U>

where

F: FnOnce(&T) -> &U,

{

match s {

Self::Ref(r) => BorrowedValue::Ref(f(r)),

Self::MuLock(m) => BorrowedValue::MappedMuLock(PyMutexGuard::map_immutable(m, f)),

Self::MappedMuLock(m) => {

BorrowedValue::MappedMuLock(PyImmutableMappedMutexGuard::map(m, f))

}

Self::ReadLock(r) => BorrowedValue::MappedReadLock(PyRwLockReadGuard::map(r, f)),

Self::MappedReadLock(m) => {

BorrowedValue::MappedReadLock(PyMappedRwLockReadGuard::map(m, f))

}

impl<T: ?Sized> Deref for BorrowedValue<'_, T> {

type Target = T;

fn deref(&self) -> &T {

match self {

Self::Ref(r) => r,

Self::MuLock(m) => m,

Self::MappedMuLock(m) => m,

Self::ReadLock(r) => r,

Self::MappedReadLock(m) => m,

}

impl fmt::Display for BorrowedValue<'_, str> {

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

fmt::Display::fmt(self.deref(), f)

}

#[derive(Debug)]

pub enum BorrowedValueMut<'a, T: ?Sized> {

RefMut(&'a mut T),

MuLock(PyMutexGuard<'a, T>),

MappedMuLock(PyMappedMutexGuard<'a, T>),

WriteLock(PyRwLockWriteGuard<'a, T>),

MappedWriteLock(PyMappedRwLockWriteGuard<'a, T>),

}

impl_from!('a, T, BorrowedValueMut<'a, T>,

RefMut(&'a mut T),

MuLock(PyMutexGuard<'a, T>),

MappedMuLock(PyMappedMutexGuard<'a, T>),

WriteLock(PyRwLockWriteGuard<'a, T>),

MappedWriteLock(PyMappedRwLockWriteGuard<'a, T>),

);

impl<'a, T: ?Sized> BorrowedValueMut<'a, T> {

pub fn map<U: ?Sized, F>(s: Self, f: F) -> BorrowedValueMut<'a, U>

where

F: FnOnce(&mut T) -> &mut U,

{

match s {

Self::RefMut(r) => BorrowedValueMut::RefMut(f(r)),

Self::MuLock(m) => BorrowedValueMut::MappedMuLock(PyMutexGuard::map(m, f)),

Self::MappedMuLock(m) => BorrowedValueMut::MappedMuLock(PyMappedMutexGuard::map(m, f)),

Self::WriteLock(r) => BorrowedValueMut::MappedWriteLock(PyRwLockWriteGuard::map(r, f)),

Self::MappedWriteLock(m) => {

BorrowedValueMut::MappedWriteLock(PyMappedRwLockWriteGuard::map(m, f))

}

impl<T: ?Sized> Deref for BorrowedValueMut<'_, T> {

type Target = T;

fn deref(&self) -> &T {

match self {

Self::RefMut(r) => r,

Self::MuLock(m) => m,

Self::MappedMuLock(m) => m,

Self::WriteLock(w) => w,

Self::MappedWriteLock(w) => w,

}

impl<T: ?Sized> DerefMut for BorrowedValueMut<'_, T> {

fn deref_mut(&mut self) -> &mut T {

match self {

Self::RefMut(r) => r,

Self::MuLock(m) => &mut *m,

Self::MappedMuLock(m) => &mut *m,

Self::WriteLock(w) => &mut *w,

Self::MappedWriteLock(w) => &mut *w,

}

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