diff --git a/src/lib/data/buildings.json b/src/lib/data/buildings.json
index 14afbb6..ec0895a 100644
--- a/src/lib/data/buildings.json
+++ b/src/lib/data/buildings.json
@@ -4,21 +4,39 @@
         "buildings": [
             {
                 "id": "iron-mine",
-                "cost": {
-                    "iron": 1,
-                    "gold": 1,
-                    "coal": 1
-                },
+                "cost": [
+                    {
+                        "name": "iron",
+                        "amount": 1
+                    },
+                    {
+                        "name": "gold",
+                        "amount": 1
+                    },
+                    {
+                        "name": "coal",
+                        "amount": 1
+                    }
+                ],
                 "energy": 11,
                 "multiplier": 2
             },
             {
                 "id": "gold-mine",
-                "cost": {
-                    "iron": 2,
-                    "gold": 2,
-                    "coal": 2
-                },
+                "cost": [
+                    {
+                        "name": "iron",
+                        "amount": 1
+                    },
+                    {
+                        "name": "gold",
+                        "amount": 1
+                    },
+                    {
+                        "name": "coal",
+                        "amount": 1
+                    }
+                ],
                 "energy": 11,
                 "multiplier": 2.5
             }
@@ -28,11 +46,20 @@
         "buildings": [
             {
                 "id": "research-lab",
-                "cost": {
-                    "iron": 10,
-                    "gold": 11,
-                    "coal": 12
-                },
+                "cost": [
+                    {
+                        "name": "iron",
+                        "amount": 1
+                    },
+                    {
+                        "name": "gold",
+                        "amount": 1
+                    },
+                    {
+                        "name": "coal",
+                        "amount": 1
+                    }
+                ],
                 "energy": 100,
                 "multiplier": 3
             }
diff --git a/src/lib/utils/calculateAvailableResources.ts b/src/lib/utils/calculateAvailableResources.ts
index 5855f57..733274f 100644
--- a/src/lib/utils/calculateAvailableResources.ts
+++ b/src/lib/utils/calculateAvailableResources.ts
@@ -1,16 +1,20 @@
+import type Resource from "../../types/Resource";
 import type Resources from "../../types/Resources";
 
-export default function calculateAvailableResources(userResources: Resources, buildingCost: Resources) {
+export default function calculateAvailableResources(userResources: Array<Resource>, buildingCost: Array<Resource>) {
     let canBuild = true;
-    const resources = {} as Resources;
-    
-    let resource: keyof Resources;
-    for (resource in buildingCost) {
-        resources[resource] = userResources[resource] - buildingCost[resource];
-        if (userResources[resource] < buildingCost[resource]) {
-            canBuild = false;
+    const resources = {} as Array<Resource>;
+
+    userResources.forEach((userResource) => {
+        const resource = buildingCost.find((buildingResource) => buildingResource.name === userResource.name);
+        if (resource) {
+            resources.push({
+                name: userResource.name,
+                amount: userResource.amount - resource.amount
+            });
+            if (userResource.amount < resource.amount) canBuild = false;
         }
-    }
+    });
 
     return {
         canBuild,
diff --git a/src/pages/api/build/createBuilding.ts b/src/pages/api/build/createBuilding.ts
index a5bc6ea..1272d6f 100644
--- a/src/pages/api/build/createBuilding.ts
+++ b/src/pages/api/build/createBuilding.ts
@@ -1,16 +1,26 @@
 import { type APIRoute } from "astro";
 import validateAccessToken from "../../../lib/utils/validateAccessToken";
 import { getAccessToken } from "../../../lib/db/accessTokens";
-import { getUserResources } from "../../../lib/db/users";
+// import { getUserResources } from "../../../lib/db/users";
+import { getUserResources } from "../../../lib/utils/resourceManager";
 import buildings from '../../../lib/data/buildings.json';
 import calculateAvailableResources from "../../../lib/utils/calculateAvailableResources";
+import { getUserByAccessToken } from "../../../lib/db/users";
 
 export const POST: APIRoute = async({ request }) => {
     const response = await validateAccessToken(request);
     if(response instanceof Response) return response;
 
-    const user = response.username;
-    const resources = await getUserResources(user);
+    const user = await getUserByAccessToken(response);
+    if(user === null) {
+        return new Response(
+            JSON.stringify({
+                code: 401,
+                message: "Unauthorized"
+            }), { status: 401 }
+        )
+    }
+    const resources = await getUserResources(user._id);
     const buildingId = (await request.json()).building;
     const building = buildings.map(cat => cat.buildings.filter(b => b.id === buildingId))[0][0];
     const balance = calculateAvailableResources(resources, building.cost);
diff --git a/src/pages/game/buildings.astro b/src/pages/game/buildings.astro
index 6aece36..08e79d8 100644
--- a/src/pages/game/buildings.astro
+++ b/src/pages/game/buildings.astro
@@ -1,9 +1,11 @@
 ---
 import Layout from '../../layouts/Layout.astro';
 import NavBar from '../../components/NavBar.astro';
-import { getUserByAccessToken, getUserResources } from '../../lib/db/users';
+import { getUserByAccessToken } from '../../lib/db/users';
 import { getHighestWeightedLanguage, getLocales } from '../../lib/lang/langDriver';
 import ResourceBar from '../../components/ResourceBar.astro';
+// import { calculateCurrentAvailableResources } from '../../lib/utils/resourceManager';
+// import { getUserResources } from '../../lib/utils/resourceManager';
 
 const buildingsList = (await import('../../lib/data/buildings.json')).default;
 
@@ -14,13 +16,14 @@ if(loggedToken === null || username === "") return Astro.redirect('/logout');
 const checkUser = await getUserByAccessToken(loggedToken);
 if(checkUser === null || checkUser.username !== username) return Astro.redirect('/logout');
 
-const resources = await getUserResources(checkUser._id);
+// const resources = await getUserResources(checkUser._id);
 
 const locale = getHighestWeightedLanguage(Astro.request.headers.get('accept-language'));
 
 const langResources = await getLocales(locale, 'resources');
 const langGame = await getLocales(locale, 'game');
 const langBuildings = await getLocales(locale, 'buildings');
+// console.log(await calculateCurrentAvailableResources(checkUser._id));
 ---
 
 <Layout title="Buildings">
diff --git a/src/pages/game/index.astro b/src/pages/game/index.astro
index fd0c223..c4d464d 100644
--- a/src/pages/game/index.astro
+++ b/src/pages/game/index.astro
@@ -3,6 +3,7 @@ import Layout from '../../layouts/Layout.astro';
 import NavBar from '../../components/NavBar.astro';
 import ResourceBar from '../../components/ResourceBar.astro';
 import { getUserByAccessToken } from '../../lib/db/users';
+// import { createInitialResources } from '../../lib/utils/resourceManager';
 
 const loggedToken = Astro.cookies.get('sessionToken')?.value ?? null;
 const username = Astro.cookies.get('username')?.value ?? "";
@@ -10,7 +11,7 @@ if(loggedToken === null || username === "") return Astro.redirect('/logout');
 
 const checkUser = await getUserByAccessToken(loggedToken);
 if(checkUser === null || checkUser.username !== username) return Astro.redirect('/logout');
-
+// createInitialResources(checkUser._id);
 ---
 
 <Layout title="chujów sto">