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use crate::{
    collections::index_set::{ArchivedIndexSet, IndexSetResolver},
    ser::{ScratchSpace, Serializer},
    Archive, Deserialize, Fallible, Serialize,
};
use core::hash::{BuildHasher, Hash};
use indexmap::IndexSet;

impl<K: Archive, S> Archive for IndexSet<K, S> {
    type Archived = ArchivedIndexSet<K::Archived>;
    type Resolver = IndexSetResolver;

    unsafe fn resolve(&self, pos: usize, resolver: Self::Resolver, out: *mut Self::Archived) {
        ArchivedIndexSet::resolve_from_len(self.len(), pos, resolver, out);
    }
}

impl<K, S, RandomState> Serialize<S> for IndexSet<K, RandomState>
where
    K: Hash + Eq + Serialize<S>,
    S: ScratchSpace + Serializer + ?Sized,
    RandomState: BuildHasher,
{
    fn serialize(&self, serializer: &mut S) -> Result<IndexSetResolver, S::Error> {
        unsafe {
            ArchivedIndexSet::serialize_from_iter_index(
                self.iter(),
                |k| self.get_index_of(k).unwrap(),
                serializer,
            )
        }
    }
}

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

impl<UK, K: PartialEq<UK>, S: BuildHasher> PartialEq<IndexSet<UK, S>> for ArchivedIndexSet<K> {
    fn eq(&self, other: &IndexSet<UK, S>) -> bool {
        self.iter().eq(other.iter())
    }
}

#[cfg(test)]
mod tests {
    use crate::{
        archived_root,
        ser::{serializers::AllocSerializer, Serializer},
        Deserialize, Infallible,
    };
    use indexmap::{indexset, IndexSet};

    #[test]
    fn index_set() {
        let value = indexset! {
            String::from("foo"),
            String::from("bar"),
            String::from("baz"),
            String::from("bat"),
        };

        let mut serializer = AllocSerializer::<4096>::default();
        serializer.serialize_value(&value).unwrap();
        let result = serializer.into_serializer().into_inner();
        let archived = unsafe { archived_root::<IndexSet<String>>(result.as_ref()) };

        assert_eq!(value.len(), archived.len());
        for k in value.iter() {
            let ak = archived.get(k.as_str()).unwrap();
            assert_eq!(k, ak);
        }

        let deserialized: IndexSet<String> = archived.deserialize(&mut Infallible).unwrap();
        assert_eq!(value, deserialized);
    }

    #[cfg(feature = "validation")]
    #[test]
    fn validate_index_set() {
        use crate::check_archived_root;

        let value = indexset! {
            String::from("foo"),
            String::from("bar"),
            String::from("baz"),
            String::from("bat"),
        };

        let mut serializer = AllocSerializer::<4096>::default();
        serializer.serialize_value(&value).unwrap();
        let result = serializer.into_serializer().into_inner();
        check_archived_root::<IndexSet<String>>(result.as_ref())
            .expect("failed to validate archived index set");
    }
}