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.")