Show culture in the HUD and make philosophers produce it.

src/hud/Resources.svelte

@@ -28,6 +28,10 @@
         { Math.floor($village.resources.food) } / { capacity.food }
         ({ production.food >= 0 ? '+' : '' }{ production.food })
     </div>
+    <div>
+        <img src="/img/icons/culture.png" alt="Culture" />
+        { Math.floor($village.resources.culture) }
+    </div>
 </div>
 
 <style>

src/types.ts

@@ -15,6 +15,11 @@ export interface CostType {
 export type ProductionType = CostType;
 
 
+export interface ResourcesType extends CostType {
+    culture: number;
+}
+
+
 export interface BuildingSource {
     name: string;
     type: string;

src/update.ts

@@ -1,6 +1,6 @@
 import { produce } from 'immer';
 
-import { getBuilding, getProduction, getStorage } from './utils';
+import { getBuilding, getProduction, getStorage, getUnitSource } from './utils';
 import village, { type VillageState } from "./village";
 import type { ProductionType } from './types';
 
@@ -67,6 +67,12 @@ export default function update(timestamp: number) {
                 }
             });
 
+            // Make philosophers produce culture.
+            const philosopher = getUnitSource('philosopher');
+            const outputPerMinute = philosopher.behavior.culturePerMinute;
+            const outputPerMilisecond = outputPerMinute /  60.0 / 1000.0;
+            V.resources.culture += outputPerMilisecond * delta * V.units.philosopher;
+
             return V;
         });
     });

src/village.ts

@@ -2,7 +2,7 @@ import { writable } from "svelte/store";
 
 import { createBuilding } from "./create";
 import { getTilesAtDistance, Hex } from "./hexgrid";
-import type { BuildingType } from "./types";
+import type { BuildingType, ResourcesType } from "./types";
 import { getKeysAsNumbers, shuffle } from "./utils";
 
 
@@ -24,13 +24,7 @@ export interface VillageState {
     units: {
         [key: string]: number;
     },
-    resources: {
-        wood: number;
-        stone: number;
-        iron: number;
-        food: number;
-        culture: number;
-    };
+    resources: ResourcesType;
     villageTiles: Board;
     outsideTiles: Board;
     queue: QueuedBuilding[];