save state of code

client/src/state/progress.ts

@@ -0,0 +1,30 @@
+import { createSlice } from '@reduxjs/toolkit'
+import type { PayloadAction } from '@reduxjs/toolkit'
+
+interface ProgressState {
+  code: {[world: string]: {[level: number]: string}}
+}
+
+const initialState = { code: {} } as ProgressState
+
+export const progressSlice = createSlice({
+  name: 'progress',
+  initialState,
+  reducers: {
+    codeEdited(state, action: PayloadAction<{world: string, level: number, code: string}>) {
+      if (!state.code[action.payload.world]) {
+        state.code[action.payload.world] = {}
+      }
+      state.code[action.payload.world][action.payload.level] = action.payload.code
+    },
+  }
+})
+
+export function selectCode(world: string, level: number) {
+  return (state) => {
+    if (!state.progress.code[world]) { return undefined }
+    state.progress.code[world][level];
+  }
+}
+
+export const { codeEdited } = progressSlice.actions