Rework ScriptOwners to be a little easier to use

pkmn_lib_interface/src/handling/script.rs

@@ -1,13 +1,14 @@
 use crate::app_interface::list::ImmutableList;
 use crate::app_interface::{
-    Battle, DamageSource, DynamicLibrary, EffectParameter, ExecutingMove, Item, Pokemon, Statistic,
-    TurnChoice, TypeIdentifier,
+    Battle, BattleSide, DamageSource, DynamicLibrary, EffectParameter, ExecutingMove, Item,
+    Pokemon, Statistic, TurnChoice, TypeIdentifier,
 };
 use crate::handling::ScriptCapabilities;
 use crate::{ExternRef, ExternalReferenceType, StringKey};
 use alloc::rc::Rc;
 use core::any::Any;
-use core::fmt::Debug;
+use core::fmt::{Debug, Display, Formatter};
+use core::panicking::panic;
 
 pub trait Script {
     fn new() -> Self
@@ -346,25 +347,11 @@ pub trait Script {
 
     fn as_any(&self) -> &dyn Any;
 
-    #[cfg(not(feature = "mock_data"))]
-    fn get_owner<T>(&self) -> Option<T>
-    where
-        T: ExternalReferenceType,
-        Self: Sized,
-    {
-        unsafe {
-            script_get_owner(crate::implementation::ScriptPtr::from_existing(self))
-                .cast::<T>()
-                .get_value()
-        }
-    }
-
-    #[cfg(feature = "mock_data")]
-    fn get_owner<T>(&self) -> Option<T>
+    fn get_owner(&self) -> Option<ScriptOwner>
     where
         Self: Sized,
     {
-        unimplemented!()
+        ScriptOwner::from_script(self)
     }
 }
 
@@ -376,5 +363,91 @@ impl Debug for dyn Script {
 
 #[cfg(not(feature = "mock_data"))]
 extern "wasm" {
+    fn script_get_owner_kind(pointer: crate::implementation::ScriptPtr) -> u8;
     fn script_get_owner(pointer: crate::implementation::ScriptPtr) -> ExternRef<u8>;
 }
+
+pub enum ScriptOwner {
+    Pokemon(Pokemon),
+    BattleSide(BattleSide),
+    Battle(Battle),
+    None,
+}
+
+impl ScriptOwner {
+    #[cfg(not(feature = "mock_data"))]
+    fn from_script(script: &dyn Script) -> Option<ScriptOwner> {
+        let script_ptr = crate::implementation::ScriptPtr::from_existing(script);
+        unsafe {
+            let kind = script_get_owner_kind(script_ptr);
+            match kind {
+                0 => {
+                    let r = script_get_owner(script_ptr)
+                        .cast::<crate::app_interface::PokemonImpl>()
+                        .get_value();
+                    if r.is_none() {
+                        None
+                    } else {
+                        Some(ScriptOwner::Pokemon(Rc::new(r.unwrap())))
+                    }
+                }
+                1 => {
+                    let r = script_get_owner(script_ptr)
+                        .cast::<crate::app_interface::BattleSideImpl>()
+                        .get_value();
+                    if r.is_none() {
+                        None
+                    } else {
+                        Some(ScriptOwner::BattleSide(Rc::new(r.unwrap())))
+                    }
+                }
+                2 => {
+                    let r = script_get_owner(script_ptr)
+                        .cast::<crate::app_interface::BattleImpl>()
+                        .get_value();
+                    if r.is_none() {
+                        None
+                    } else {
+                        Some(ScriptOwner::Battle(Rc::new(r.unwrap())))
+                    }
+                }
+                _ => panic!("Unknown script owner kind: {}", kind),
+            }
+        }
+    }
+
+    #[cfg(feature = "mock_data")]
+    fn from_script(script: &dyn Script) -> Option<ScriptOwner> {
+        unimplemented!();
+    }
+
+    pub fn as_pokemon(&self) -> Pokemon {
+        if let ScriptOwner::Pokemon(p) = self {
+            return p.clone();
+        }
+        panic!("ScriptOwner was not a Pokemon, but a {self}");
+    }
+    pub fn as_side(&self) -> BattleSide {
+        if let ScriptOwner::BattleSide(p) = self {
+            return p.clone();
+        }
+        panic!("ScriptOwner was not a BattleSide, but a {self}");
+    }
+    pub fn as_battle(&self) -> Battle {
+        if let ScriptOwner::Battle(p) = self {
+            return p.clone();
+        }
+        panic!("ScriptOwner was not a Battle, but a {self}");
+    }
+}
+
+impl Display for ScriptOwner {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            ScriptOwner::Pokemon(_) => f.write_str("Pokemon"),
+            ScriptOwner::BattleSide(_) => f.write_str("BattleSide"),
+            ScriptOwner::Battle(_) => f.write_str("Battle"),
+            ScriptOwner::None => f.write_str("None"),
+        }
+    }
+}

pkmn_lib_interface/src/lib.rs

@@ -80,6 +80,7 @@ mod implementation {
     static mut SCRIPT_INDEX_COUNTER: AtomicU32 = AtomicU32::new(1);
 
     #[repr(C)]
+    #[derive(Copy, Clone)]
     pub struct ScriptPtr {
         index: u32,
     }