Create services.js

services.js

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+// services.js - Core Business Logic
+
+import { appState, saveState } from './state.js';
+import { refreshUI, showToast } from './ui.js';
+
+export function handleUpdateStock(productName, quantity) {
+    if (isNaN(quantity) || quantity <= 0) return;
+    const recipe = appState.productRecipes[productName];
+    if (!recipe) { showToast(`Error: No recipe found for ${productName}.`, 'error'); return; }
+
+    // Check if there are enough materials
+    for (const materialName in recipe) {
+        const required = recipe[materialName] * quantity;
+        const material = appState.materials.find(m => m.name === materialName);
+        if (!material || material.currentStock < required) {
+            showToast(`Insufficient materials for ${quantity}x ${productName}.`, 'error');
+            return;
+        }
+    }
+
+    // Deduct materials
+    for (const materialName in recipe) {
+        const required = recipe[materialName] * quantity;
+        appState.materials.find(m => m.name === materialName).currentStock -= required;
+    }
+    
+    appState.productionLog.push({ productName, quantity, date: new Date().toISOString() });
+    
+    saveState();
+    refreshUI();
+    showToast(`Produced ${quantity}x ${productName}.`, 'success');
+    
+    // Clear input field after production
+    const productCard = document.querySelector(`.product-card[data-product-name="${productName}"]`);
+    if(productCard) productCard.querySelector('input').value = '0';
+}
+
+export function handleRestock(materialName, quantity) {
+    if (isNaN(quantity) || quantity <= 0) return;
+    const material = appState.materials.find(m => m.name === materialName);
+    if (!material) return;
+    
+    const oldStock = material.currentStock;
+    let newStock = oldStock + quantity;
+
+    if (newStock > material.maxStock) {
+        newStock = material.maxStock;
+        showToast(`Stock for ${materialName} is full. Added ${newStock - oldStock} units.`, 'info');
+    } else {
+        showToast(`Restocked ${quantity} ${material.unit} of ${materialName}.`, 'success');
+    }
+    
+    material.currentStock = newStock;
+    saveState();
+    refreshUI();
+}