feat: print receipt

print/print_receipt.py

@@ -0,0 +1,71 @@
+import sys
+import json
+from datetime import datetime
+from escpos.printer import Win32Raw
+
+LINE_WIDTH = 48  # 80mm paper
+
+def safe_float(v):
+    return float(v) if v is not None else 0.0
+
+def money(n):
+    return f"{int(safe_float(n)):,}"
+
+def space_between(left, right, width=LINE_WIDTH):
+    space = max(1, width - len(str(left)) - len(str(right)))
+    return f"{left}{' ' * space}{right}"
+
+def print_receipt(data, printer_name="XP-80C"):
+    p = Win32Raw(printer_name=printer_name)
+    
+    # Big bold header
+    p.set(align='center', bold=True, double_height=True, double_width=True)
+    p.text("ERP\n")
+
+    p.set(align='center', bold=False, normal_textsize=True)
+    p.text(f"Invoice: {data['code']}\n")
+    p.text(f"{data['ordered_at'][:10]}\n")
+    p.text("-" * LINE_WIDTH + "\n")
+
+    p.set(align='left')
+    p.text(f"Customer: {data['customer_name']}\n")
+    p.text(f"Phone:    {data['customer_phone']}\n")
+    p.text(f"Address:  {data['shipping_address']}\n")
+    p.text("-" * LINE_WIDTH + "\n")
+
+    for item in data['items']:
+        p.text(f"{item['name']}\n")
+        p.text(f"  {item['variant']}\n")
+        p.text(space_between("", money(item['price'])) + "\n")
+
+    p.text("-" * LINE_WIDTH + "\n")
+
+    p.text(space_between("Subtotal:", money(data['product_amount'])) + "\n")
+    if safe_float(data['shipping_fee']) > 0:
+        p.text(space_between("Shipping:", money(data['shipping_fee'])) + "\n")
+    if safe_float(data['discount_amount']) > 0:
+        p.text(space_between("Discount:", f"-{money(data['discount_amount'])}") + "\n")
+
+    p.set(bold=True)
+    p.text(space_between("TOTAL:", money(data['final_amount']) + " VND") + "\n")
+    p.set(bold=False)
+
+    p.text("-" * LINE_WIDTH + "\n")
+
+    if safe_float(data['cash_amount']) > 0:
+        p.text(space_between("Cash:", money(data['cash_amount'])) + "\n")
+    if safe_float(data['transfer_amount']) > 0:
+        p.text(space_between("Transfer:", money(data['transfer_amount'])) + "\n")
+
+    p.text("\n\n")
+    p.set(align='center')
+    now_str = datetime.now().strftime("%H:%M %d/%m/%Y")
+    p.text(f"{now_str}\n")
+
+    p.text("\n" * 3)
+    p.cut()
+
+if __name__ == "__main__":
+    data = json.loads(sys.argv[1])
+    print_receipt(data)
+    print("Sent to printer.")

print/receipt_template.txt

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+{big_title}
+{header}
+{line}
+{customer_block}
+{line}
+{items}
+{line}
+{totals}
+{line}
+{payment}
+{line_break}
+{footer_time}
+{blanks}