use crate::app_interface::{DataLibrary, Item};
use alloc::rc::Rc;

pub trait ItemLibraryTrait: DataLibrary<Item> {}

pub type ItemLibrary = Rc<dyn ItemLibraryTrait>;

#[cfg(not(feature = "mock_data"))]
mod implementation {
    use super::*;
    use crate::app_interface::{ItemImpl, StringKey};
    use crate::handling::extern_ref::{ExternRef, ExternalReferenceType};
    use spin::RwLock;

    struct ItemLibraryInner {
        ptr: ExternRef<ItemLibraryImpl>,
        cache: RwLock<hashbrown::HashMap<u32, Item>>,
    }

    #[derive(Clone)]
    pub struct ItemLibraryImpl {
        inner: Rc<ItemLibraryInner>,
    }

    impl ItemLibraryImpl {
        pub(crate) fn new(ptr: ExternRef<Self>) -> Self {
            Self {
                inner: Rc::new(ItemLibraryInner {
                    ptr,
                    cache: Default::default(),
                }),
            }
        }
    }

    impl ItemLibraryTrait for ItemLibraryImpl {}

    impl DataLibrary<Item> for ItemLibraryImpl {
        fn get_cache(&self) -> &spin::rwlock::RwLock<hashbrown::HashMap<u32, Item>> {
            &self.inner.cache
        }

        fn get_self_ref(&self) -> ExternRef<Self> {
            self.inner.ptr
        }

        fn _get_ref_by_name(ptr: ExternRef<Self>, name: ExternRef<StringKey>) -> u32 {
            unsafe { item_library_get_item(ptr, name).get_internal_index() }
        }

        fn _get_ref_by_hash(ptr: ExternRef<Self>, hash: u32) -> u32 {
            unsafe { item_library_get_item_by_hash(ptr, hash).get_internal_index() }
        }

        fn _from_external_ref_index(index: u32) -> Option<Item> {
            let v = ExternRef::<ItemImpl>::from(index).get_value();
            if let Some(v) = v {
                Some(Rc::new(v))
            } else {
                None
            }
        }
    }

    crate::handling::cacheable::cacheable!(ItemLibraryImpl);

    impl ExternalReferenceType for ItemLibraryImpl {
        fn from_extern_value(reference: ExternRef<Self>) -> Self {
            Self::new(reference)
        }
    }

    extern "wasm" {
        fn item_library_get_item(
            ptr: ExternRef<ItemLibraryImpl>,
            name: ExternRef<StringKey>,
        ) -> ExternRef<ItemImpl>;
        fn item_library_get_item_by_hash(
            ptr: ExternRef<ItemLibraryImpl>,
            hash: u32,
        ) -> ExternRef<ItemImpl>;
    }
}

#[cfg(not(feature = "mock_data"))]
pub use implementation::*;