Create reportService.js

reportService.js

@@ -0,0 +1,35 @@
+// reportService.js - Logic for generating reports
+
+import { appState } from './state.js';
+
+const THIRTY_DAYS_AGO = new Date(new Date().setDate(new Date().getDate() - 30));
+
+export function getMonthlyProductionSummary() {
+    const summary = {};
+    appState.productionLog
+        .filter(entry => new Date(entry.date) > THIRTY_DAYS_AGO)
+        .forEach(entry => {
+            if (!summary[entry.productName]) {
+                summary[entry.productName] = 0;
+            }
+            summary[entry.productName] += entry.quantity;
+        });
+    return summary;
+}
+
+export function getMonthlyMaterialUsage() {
+    const usage = {};
+    appState.productionLog
+        .filter(entry => new Date(entry.date) > THIRTY_DAYS_AGO)
+        .forEach(entry => {
+            const recipe = appState.productRecipes[entry.productName];
+            if (!recipe) return;
+            for (const materialName in recipe) {
+                if (!usage[materialName]) {
+                    usage[materialName] = 0;
+                }
+                usage[materialName] += recipe[materialName] * entry.quantity;
+            }
+        });
+    return usage;
+}