From c2a6efb1b761014a90d90373cad47a14054af40b Mon Sep 17 00:00:00 2001
From: Josh Kingsley <josh@joshkingsley.me>
Date: Sun, 23 Nov 2025 17:27:44 +0200
Subject: feat(crdt): add wasm-bindgen

---
 crdt/Cargo.toml |  6 ++++++
 crdt/src/doc.rs | 15 ++++++++++++++-
 crdt/src/lib.rs | 58 ++++++++++++++++++++++++++++++++++++++-------------------
 3 files changed, 59 insertions(+), 20 deletions(-)

(limited to 'crdt')

diff --git a/crdt/Cargo.toml b/crdt/Cargo.toml
index fe50142..71f745a 100644
--- a/crdt/Cargo.toml
+++ b/crdt/Cargo.toml
@@ -3,7 +3,13 @@ name = "notive-crdt"
 version = "0.1.0"
 edition = "2024"
 
+[lib]
+crate-type = ["cdylib"]
+
 [dependencies]
 num-rational = "0.4.2"
+serde = { version = "1.0.228", features = ["derive"] }
+serde-wasm-bindgen = "0.6.5"
 thiserror = "2.0.17"
 uuid = { version = "1.18.1", features = ["v7"] }
+wasm-bindgen = "0.2.105"
diff --git a/crdt/src/doc.rs b/crdt/src/doc.rs
index bbd24d0..fcca1d8 100644
--- a/crdt/src/doc.rs
+++ b/crdt/src/doc.rs
@@ -1,3 +1,4 @@
+use serde::{Deserialize, Serialize};
 use thiserror::Error;
 use uuid::Uuid;
 
@@ -41,21 +42,33 @@ impl DerivableId for DerivedId {
     }
 }
 
-#[derive(Default)]
+impl Serialize for DerivedId {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(&self.to_string())
+    }
+}
+
+#[derive(Default, Serialize)]
 pub struct Doc {
     pub(crate) grids: Vec<Grid>,
 }
 
+#[derive(Serialize)]
 pub struct Grid {
     pub(crate) id: DerivedId,
     pub(crate) rows: Vec<Row>,
 }
 
+#[derive(Serialize)]
 pub struct Row {
     pub(crate) id: DerivedId,
     pub(crate) cells: Vec<Cell>,
 }
 
+#[derive(Serialize)]
 pub struct Cell {
     pub(crate) id: DerivedId,
 }
diff --git a/crdt/src/lib.rs b/crdt/src/lib.rs
index 977763f..3c89ce9 100644
--- a/crdt/src/lib.rs
+++ b/crdt/src/lib.rs
@@ -1,13 +1,10 @@
-//! This crate defines the distributed state management system for
-//! Notive. The state is an operation-based CRDT, which given the same
-//! set of operations on any client, will realize the same state.
-
 use thiserror::Error;
 use uuid::Uuid;
+use wasm_bindgen::prelude::*;
 
 use crate::{
     doc::{ApplyOpError, Doc},
-    op::{Op, OpKind},
+    op::{CreateGrid, Op, OpKind},
     vector_clock::VectorClock,
 };
 
@@ -21,18 +18,28 @@ pub enum Error {
     RealizeError(#[from] ApplyOpError),
 }
 
-#[derive(Default)]
+#[wasm_bindgen]
 pub struct State {
+    actor_id: Uuid,
     ops: Vec<Op>,
 }
 
 impl State {
-    pub fn append_op(&mut self, actor_id: &Uuid, kind: OpKind) {
+    pub fn new() -> Self {
+        let actor_id = Uuid::now_v7();
+
+        Self {
+            actor_id,
+            ops: vec![],
+        }
+    }
+
+    pub fn append_op(&mut self, kind: OpKind) {
         let clock = self
             .ops
             .last()
-            .map(|op| op.clock.inc(actor_id))
-            .unwrap_or_else(|| VectorClock::new().inc(actor_id));
+            .map(|op| op.clock.inc(&self.actor_id))
+            .unwrap_or_else(|| VectorClock::new().inc(&self.actor_id));
 
         self.ops.push(Op {
             id: Uuid::now_v7(),
@@ -52,6 +59,24 @@ impl State {
     }
 }
 
+#[wasm_bindgen]
+pub fn make_state() -> State {
+    State::new()
+}
+
+#[wasm_bindgen]
+pub fn create_grid(state: &mut State) {
+    state.append_op(OpKind::CreateGrid(CreateGrid {
+        rows: 4,
+        base_cells_per_row: 16
+    }));
+}
+
+pub fn realize(state: &State) -> JsValue {
+    let doc = state.realize().unwrap();
+    serde_wasm_bindgen::to_value(&doc).unwrap()
+}
+
 #[cfg(test)]
 mod tests {
     use crate::op::CreateGrid;
@@ -60,17 +85,12 @@ mod tests {
 
     #[test]
     fn test() {
-        let alice = Uuid::now_v7();
-
-        let mut state = State::default();
+        let mut state = State::new();
 
-        state.append_op(
-            &alice,
-            OpKind::CreateGrid(CreateGrid {
-                rows: 4,
-                base_cells_per_row: 16,
-            }),
-        );
+        state.append_op(OpKind::CreateGrid(CreateGrid {
+            rows: 4,
+            base_cells_per_row: 16,
+        }));
 
         let doc = state.realize().unwrap();
         let grid = doc.grids.first().unwrap();
-- 
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