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use crate::{
    collections::hash_set::{ArchivedHashSet, HashSetResolver},
    ser::{ScratchSpace, Serializer},
    Archive, Deserialize, Fallible, Serialize,
};
use core::{
    borrow::Borrow,
    hash::{BuildHasher, Hash},
};
use std::collections::HashSet;

impl<K: Archive + Hash + Eq, S> Archive for HashSet<K, S>
where
    K::Archived: Hash + Eq,
{
    type Archived = ArchivedHashSet<K::Archived>;
    type Resolver = HashSetResolver;

    #[inline]
    unsafe fn resolve(&self, pos: usize, resolver: Self::Resolver, out: *mut Self::Archived) {
        ArchivedHashSet::<K::Archived>::resolve_from_len(self.len(), pos, resolver, out);
    }
}

impl<K, S, RS> Serialize<S> for HashSet<K, RS>
where
    K::Archived: Hash + Eq,
    K: Serialize<S> + Hash + Eq,
    S: ScratchSpace + Serializer + ?Sized,
{
    #[inline]
    fn serialize(&self, serializer: &mut S) -> Result<Self::Resolver, S::Error> {
        unsafe { ArchivedHashSet::serialize_from_iter(self.iter(), serializer) }
    }
}

impl<K, D, S> Deserialize<HashSet<K, S>, D> for ArchivedHashSet<K::Archived>
where
    K: Archive + Hash + Eq,
    K::Archived: Deserialize<K, D> + Hash + Eq,
    D: Fallible + ?Sized,
    S: Default + BuildHasher,
{
    #[inline]
    fn deserialize(&self, deserializer: &mut D) -> Result<HashSet<K, S>, D::Error> {
        let mut result = HashSet::with_hasher(S::default());
        for k in self.iter() {
            result.insert(k.deserialize(deserializer)?);
        }
        Ok(result)
    }
}

impl<K: Hash + Eq + Borrow<AK>, AK: Hash + Eq, S: BuildHasher> PartialEq<HashSet<K, S>>
    for ArchivedHashSet<AK>
{
    #[inline]
    fn eq(&self, other: &HashSet<K, S>) -> bool {
        if self.len() != other.len() {
            false
        } else {
            self.iter().all(|key| other.get(key).is_some())
        }
    }
}

impl<K: Hash + Eq + Borrow<AK>, AK: Hash + Eq, S: BuildHasher> PartialEq<ArchivedHashSet<AK>>
    for HashSet<K, S>
{
    #[inline]
    fn eq(&self, other: &ArchivedHashSet<AK>) -> bool {
        other.eq(self)
    }
}