#48: initial logic for multy-accounts actions

src/components/accounts/reducer.js

@@ -0,0 +1,58 @@
+import { ADD, REMOVE, ACTIVATE } from './actions';
+
+/**
+ * @typedef {AccountsState}
+ * @property {Account} active
+ * @property {Account[]} available
+ */
+
+/**
+ * @param {AccountsState} state
+ * @param {string} options.type
+ * @param {object} options.payload
+ *
+ * @return {AccountsState}
+ */
+export default function accounts(
+    state,
+    {type, payload = {}}
+) {
+    switch (type) {
+        case ADD:
+            if (!payload || !payload.id || !payload.token || !payload.refreshToken) {
+                throw new Error('Invalid or empty payload passed for accounts.add');
+            }
+
+            if (!state.available.some((account) => account.id === payload.id)) {
+                state.available = state.available.concat(payload);
+            }
+
+            return state;
+
+        case ACTIVATE:
+            if (!payload || !payload.id || !payload.token || !payload.refreshToken) {
+                throw new Error('Invalid or empty payload passed for accounts.add');
+            }
+
+            return {
+                ...state,
+                active: payload
+            };
+
+        case REMOVE:
+            if (!payload || !payload.id) {
+                throw new Error('Invalid or empty payload passed for accounts.remove');
+            }
+
+            return {
+                ...state,
+                available: state.available.filter((account) => account.id !== payload.id)
+            };
+
+        default:
+            return {
+                active: null,
+                available: []
+            };
+    }
+}