1 files changed, 44 insertions, 0 deletions
diff --git a/client/src/actions.js b/client/src/actions.js
new file mode 100644
index 0000000..e1a3611
--- /dev/null
+++ b/client/src/actions.js
@@ -0,0 +1,44 @@
+import { h, createContext } from 'preact';
+import { useRef, useState, useCallback, useContext } from 'preact/hooks';
+import { API_PREFIX } from './config';
+
+export const fetchJSON = async (url, method='GET', data=undefined) => {
+  const res = await fetch(new URL(url, API_PREFIX).href, {
+    method,
+    credentials: 'include',
+    headers: { 'content-type': data && 'application/json' },
+    body: data && JSON.stringify(data),
+  });
+
+  if (res.status !== 200)
+    throw new Error("wrong status");
+
+  return res.json();
+};
+
+const DispatchContext = createContext((action) => {
+  throw new Error(`Unhandled action: ${action.type}`);
+});
+
+export const useDispatcher = ({ reducer, initialState }) => {
+  const parentDispatch = useDispatch();
+
+  const ref = useRef();
+  const [state, setState] = useState(initialState);
+  ref.current = state;
+
+  const dispatch = useCallback((action) => {
+    const update = reducer(action);
+    if (!update) return parentDispatch(action);
+
+    return update.then(f => setState(f(ref.current)));
+  }, [ref, reducer]);
+
+  return {
+    state,
+    dispatch,
+    DispatchProvider: ({ children }) => <DispatchContext.Provider value={dispatch} children={children} />,
+  };
+};
+
+export const useDispatch = () => useContext(DispatchContext);