scale configuration

index.php

@@ -6402,6 +6402,98 @@ $projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? 'Accounting System';
             this.items = this.items.filter(item => item.id !== id);
             this.render();
         },
+        setQty(id, qty) {
+            if (!this.items) return;
+            const item = this.items.find(i => i.id === id);
+            if (item) {
+                const allowZeroStock = (typeof companySettings !== 'undefined' && String(companySettings.allow_zero_stock_sell) === '1');
+                const currentStock = parseFloat(item.stock_quantity) || 0;
+                
+                if (!allowZeroStock && qty > currentStock) {
+                    Swal.fire('Error', 'Insufficient stock!', 'error');
+                    return;
+                }
+
+                item.qty = qty;
+                if (item.qty <= 0) this.remove(id);
+                else this.render();
+            }
+        },
+        async readScale(id) {
+            if (!('serial' in navigator)) {
+                Swal.fire('Error', 'Web Serial API is not supported in this browser. Please use Chrome or Edge.', 'error');
+                return;
+            }
+            try {
+                if (!this.scalePort) {
+                    this.scalePort = await navigator.serial.requestPort();
+                    await this.scalePort.open({ baudRate: 9600 });
+                } else if (!this.scalePort.readable) {
+                    await this.scalePort.open({ baudRate: 9600 });
+                }
+
+                const reader = this.scalePort.readable.getReader();
+                let accumulatedData = '';
+                
+                Swal.fire({
+                    title: 'Reading Scale...',
+                    text: 'Waiting for stable weight...',
+                    allowOutsideClick: false,
+                    didOpen: () => {
+                        Swal.showLoading();
+                    }
+                });
+
+                let weight = null;
+                const decoder = new TextDecoder('utf-8');
+                let readCount = 0;
+
+                while (readCount < 30) {
+                    const { value, done } = await Promise.race([
+                        reader.read(),
+                        new Promise((_, reject) => setTimeout(() => reject(new Error('Timeout')), 1000))
+                    ]).catch(e => ({ done: true, value: null }));
+                    
+                    if (done) break;
+                    if (value) {
+                        accumulatedData += decoder.decode(value);
+                        const matches = accumulatedData.match(/[\d]+\.\d+/g);
+                        if (matches && matches.length > 0) {
+                            weight = parseFloat(matches[matches.length - 1]);
+                            if (!isNaN(weight) && weight > 0) {
+                                break;
+                            }
+                        }
+                    }
+                    readCount++;
+                }
+
+                reader.releaseLock();
+
+                if (weight !== null && weight > 0) {
+                    Swal.close();
+                    this.setQty(id, weight);
+                    Swal.fire({
+                        toast: true,
+                        position: 'top-end',
+                        icon: 'success',
+                        title: 'Weight Read: ' + weight.toFixed(3) + ' kg',
+                        showConfirmButton: false,
+                        timer: 1500
+                    });
+                } else {
+                    Swal.fire('Warning', 'Could not read a valid weight. Please try again.', 'warning');
+                }
+            } catch (err) {
+                console.error('Scale Error:', err);
+                if (err.name === 'NotFoundError') {
+                    // User cancelled the prompt
+                    return;
+                }
+                Swal.fire('Error', 'Failed to read from scale: ' + err.message, 'error');
+                this.scalePort = null;
+            }
+        },
         updateQty(id, delta) {
             if (!this.items) return;
             const item = this.items.find(i => i.id === id);
@@ -6641,6 +6733,9 @@ $projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? 'Accounting System';
                                 <button class="qty-btn" onclick="cart.updateQty(${item.id}, -1)">-</button>
                                 <span class="small fw-bold">${qty}</span>
                                 <button class="qty-btn" onclick="cart.updateQty(${item.id}, 1)">+</button>
+                                <button class="qty-btn ms-1 bg-info text-white border-info" style="border-radius: 4px; padding: 0 6px;" onclick="cart.readScale(${item.id})" title="Read from Scale">
+                                    <i class="bi bi-speedometer2"></i>
+                                </button>
                             </div>
                             <div class="text-end" style="min-width: 80px;">
                                 <div class="fw-bold small"><?= __('currency') ?> ${itemTotal.toFixed(3)}</div>