use crate::{
    result::{Error, Result},
    FfiSlice, FfiSliceRef,
};

use super::{ObjectABI, VTable};

#[repr(C)]
pub struct Value {
    inner: (),
    vtable: &'static VTable<Value>,
}

impl ObjectABI for Value {
    type VTable = ValueVTable;
}

pub struct ValueVTable {
    pub serialize: unsafe extern "C" fn(buffer: FfiSliceRef<[u8]>) -> Result<Value, Error>,
    pub deserialize: unsafe extern "C" fn(this: Value) -> Result<FfiSlice<[u8]>, Error>,
}

impl ValueVTable {
    pub const fn new<V: IntoValueVTable>() -> Self {
        Self {
            serialize: V::serialize,
            deserialize: V::deserialize,
        }
    }
}

pub trait IntoValueVTable {
    unsafe extern "C" fn serialize(buffer: FfiSliceRef<[u8]>) -> Result<Value, Error>;
    unsafe extern "C" fn deserialize(this: Value) -> Result<FfiSlice<[u8]>, Error>;
}