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use std::mem::transmute;
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use giterated_models::{
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instance::Instance,
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settings::{GetSetting, Setting},
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};
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use crate::{AnySuccess, FFIBox};
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use super::OperationVTable;
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#[repr(C)]
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pub struct NewAnySetting {
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inner: FFIBox<()>,
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pub vtable: SettingVtable,
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}
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impl NewAnySetting {
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pub fn new<V: IntoSettingVTable>(value: V) -> Self {
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Self {
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inner: FFIBox::from_box(Box::new(value)).untyped(),
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vtable: SettingVtable::new::<V>(),
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}
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}
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pub unsafe fn transmute_owned<T>(self) -> Box<T> {
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Box::from_raw(self.inner.0 as *mut T)
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}
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pub unsafe fn transmute_ref<T>(&self) -> &T {
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let ptr: *const T = transmute(self.inner.0);
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ptr.as_ref().unwrap()
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}
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}
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impl From<NewAnySetting> for AnySuccess {
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fn from(val: NewAnySetting) -> Self {
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unsafe { AnySuccess::from_raw(val.inner, (val.vtable.get_setting_vtable)()) }
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}
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}
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#[derive(Clone, Copy)]
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#[repr(C)]
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pub struct SettingVtable {
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pub get_setting_vtable: unsafe extern "C" fn() -> OperationVTable,
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pub deserialize: unsafe extern "C" fn(&[u8]) -> Result<(), ()>,
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pub serialize: unsafe extern "C" fn(NewAnySetting) -> Result<FFIBox<[u8]>, ()>,
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}
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impl SettingVtable {
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pub fn new<T: IntoSettingVTable>() -> Self {
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Self {
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get_setting_vtable: T::get_setting_vtable,
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deserialize: T::deserialize,
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serialize: T::serialize,
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}
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}
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}
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pub trait IntoSettingVTable {
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unsafe extern "C" fn get_setting_vtable() -> OperationVTable;
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unsafe extern "C" fn deserialize(src: &[u8]) -> Result<(), ()>;
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unsafe extern "C" fn serialize(this: NewAnySetting) -> Result<FFIBox<[u8]>, ()>;
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}
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impl<S> IntoSettingVTable for S
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where
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S: Setting,
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{
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unsafe extern "C" fn deserialize(_src: &[u8]) -> Result<(), ()> {
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todo!()
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}
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unsafe extern "C" fn serialize(this: NewAnySetting) -> Result<FFIBox<[u8]>, ()> {
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let setting = this.transmute_owned::<S>();
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let serialized = serde_json::to_vec(&setting).unwrap();
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let serialized = serialized.into_boxed_slice();
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Ok(FFIBox::from_box(serialized))
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}
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unsafe extern "C" fn get_setting_vtable() -> OperationVTable {
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OperationVTable::new::<Instance, GetSetting>()
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}
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}
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