From 7951282376ed9805ccd263d69a55b791cbd76749 Mon Sep 17 00:00:00 2001
From: Kai Chappell <git@kschappell.com>
Date: Wed, 21 May 2025 21:03:28 +0100
Subject: [PATCH] pyodide hook for python execution

---
 frontend/src/hooks/use-pyodide.ts | 123 ++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 frontend/src/hooks/use-pyodide.ts

diff --git a/frontend/src/hooks/use-pyodide.ts b/frontend/src/hooks/use-pyodide.ts
new file mode 100644
index 0000000..c566280
--- /dev/null
+++ b/frontend/src/hooks/use-pyodide.ts
@@ -0,0 +1,123 @@
+"use client";
+
+import { useState, useEffect, useCallback, useRef } from "react";
+
+declare global {
+  interface Window {
+    loadPyodide: (config: { indexURL: string }) => Promise<PyodideInterface>;
+  }
+}
+
+interface PyodideInterface {
+  runPythonAsync: (code: string) => Promise<unknown>;
+  globals: {
+    get: (name: string) => unknown;
+  };
+}
+
+interface PyodideState {
+  pyodide: PyodideInterface | null;
+  loading: boolean;
+  error: string | null;
+}
+
+interface RunResult {
+  output: unknown;
+  error: string | null;
+}
+
+const PYODIDE_CDN = "https://cdn.jsdelivr.net/pyodide/v0.25.0/full/";
+
+export function usePyodide() {
+  const [state, setState] = useState<PyodideState>({
+    pyodide: null,
+    loading: true,
+    error: null,
+  });
+  const loadingRef = useRef(false);
+
+  useEffect(() => {
+    if (loadingRef.current || state.pyodide) return;
+    loadingRef.current = true;
+
+    const loadPyodideScript = async () => {
+      // Check if script is already loaded
+      if (window.loadPyodide) {
+        try {
+          const pyodide = await window.loadPyodide({ indexURL: PYODIDE_CDN });
+          setState({ pyodide, loading: false, error: null });
+        } catch (err) {
+          setState({
+            pyodide: null,
+            loading: false,
+            error: err instanceof Error ? err.message : "Failed to load Pyodide",
+          });
+        }
+        return;
+      }
+
+      // Load the script
+      const script = document.createElement("script");
+      script.src = `${PYODIDE_CDN}pyodide.js`;
+      script.async = true;
+
+      script.onload = async () => {
+        try {
+          const pyodide = await window.loadPyodide({ indexURL: PYODIDE_CDN });
+          setState({ pyodide, loading: false, error: null });
+        } catch (err) {
+          setState({
+            pyodide: null,
+            loading: false,
+            error: err instanceof Error ? err.message : "Failed to load Pyodide",
+          });
+        }
+      };
+
+      script.onerror = () => {
+        setState({
+          pyodide: null,
+          loading: false,
+          error: "Failed to load Pyodide script",
+        });
+      };
+
+      document.head.appendChild(script);
+    };
+
+    loadPyodideScript();
+  }, [state.pyodide]);
+
+  const runPython = useCallback(
+    async (code: string, timeout = 5000): Promise<RunResult> => {
+      if (!state.pyodide) {
+        return { output: null, error: "Pyodide not loaded" };
+      }
+
+      return new Promise((resolve) => {
+        const timeoutId = setTimeout(() => {
+          resolve({ output: null, error: "Execution timed out" });
+        }, timeout);
+
+        state.pyodide!
+          .runPythonAsync(code)
+          .then((result) => {
+            clearTimeout(timeoutId);
+            resolve({ output: result, error: null });
+          })
+          .catch((err: Error) => {
+            clearTimeout(timeoutId);
+            resolve({ output: null, error: err.message });
+          });
+      });
+    },
+    [state.pyodide]
+  );
+
+  return {
+    pyodide: state.pyodide,
+    loading: state.loading,
+    error: state.error,
+    runPython,
+  };
+}