From 3475eaee065d5522ee68c2e32755b7e6d46fed3f Mon Sep 17 00:00:00 2001
From: C191239 <zsz2007314zsz@sina.com>
Date: Fri, 15 Mar 2024 22:41:55 +0800
Subject: [PATCH] `ItemStack` decode

---
 crates/core/item/src/edcode.rs | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/crates/core/item/src/edcode.rs b/crates/core/item/src/edcode.rs
index 4ffe8545..5860f3c0 100644
--- a/crates/core/item/src/edcode.rs
+++ b/crates/core/item/src/edcode.rs
@@ -1,7 +1,8 @@
-use rimecraft_edcode::Encode;
-use rimecraft_global_cx::nbt_edcode::WriteNbt;
+use rimecraft_edcode::{Decode, Encode};
+use rimecraft_global_cx::nbt_edcode::{ReadNbt, WriteNbt};
+use rimecraft_registry::{ProvideRegistry, Reg};
 
-use crate::{stack::ItemStackCx, ItemStack};
+use crate::{stack::ItemStackCx, ItemStack, RawItem};
 
 impl<Cx> Encode for ItemStack<'_, Cx>
 where
@@ -22,7 +23,7 @@ where
                 if let Some(x) = self.nbt() {
                     Cx::write_nbt(x, buf.writer())?
                 } else {
-                    // Write empty nbt tag.
+                    // @TODO: Write empty nbt tag.
                     todo!()
                 }
             }
@@ -30,3 +31,23 @@ where
         Ok(())
     }
 }
+
+impl<'r, Cx> Decode for ItemStack<'r, Cx>
+where
+    Cx: ItemStackCx + for<'a> ReadNbt<&'a Cx::Compound> + ProvideRegistry<'r, Cx::Id, RawItem<Cx>>,
+{
+    fn decode<B>(mut buf: B) -> Result<Self, std::io::Error>
+    where
+        B: rimecraft_edcode::bytes::Buf,
+    {
+        if bool::decode(&mut buf)? {
+            let item = Reg::<'r, Cx::Id, RawItem<Cx>>::decode(&mut buf)?;
+            let count = u8::decode(&mut buf)?;
+            // @TODO: Handle null tags.
+            let nbt = todo!();
+            // Ok(ItemStack::with_nbt(item, count, nbt))
+        } else {
+            Ok(ItemStack::empty())
+        }
+    }
+}