"""QuickBooks Online API helper. Tokens from http://192.168.86.11:18801."""
import json
import time
import urllib.request

TOKEN_URL = "http://192.168.86.11:18801/kellow-tokens.json"
REFRESH_URL = "http://192.168.86.11:18803/qbo/refresh?tenant=kellow"
QBO_BASE = "https://quickbooks.api.intuit.com/v3/company"

def get_token():
    """Fetch valid QBO access token + realm_id, auto-refresh if expired."""
    with urllib.request.urlopen(TOKEN_URL, timeout=10) as resp:
        tokens = json.loads(resp.read())
    if time.time() >= tokens.get("expires_at_epoch", 0):
        req = urllib.request.Request(REFRESH_URL, method="POST")
        urllib.request.urlopen(req, timeout=15)
        with urllib.request.urlopen(TOKEN_URL, timeout=10) as resp:
            tokens = json.loads(resp.read())
    return tokens["access_token"], tokens["realm_id"]

def qbo_request(method, endpoint, body=None):
    """Make authenticated QBO API request. Returns parsed JSON."""
    access_token, realm_id = get_token()
    url = f"{QBO_BASE}/{realm_id}/{endpoint}"
    data = json.dumps(body).encode() if body else None
    req = urllib.request.Request(url, data=data, method=method, headers={
        "Authorization": f"Bearer {access_token}",
        "Accept": "application/json",
        "Content-Type": "application/json",
    })
    with urllib.request.urlopen(req, timeout=30) as resp:
        return json.loads(resp.read())

def create_invoice(customer_id, line_items, due_date=None):
    """Create invoice in QBO. line_items: [{description, amount, qty}]"""
    lines = []
    for i, item in enumerate(line_items, 1):
        lines.append({
            "LineNum": i,
            "Amount": item["amount"],
            "DetailType": "SalesItemLineDetail",
            "Description": item.get("description", ""),
            "SalesItemLineDetail": {
                "Qty": item.get("qty", 1),
                "UnitPrice": item["amount"] / item.get("qty", 1),
            }
        })
    invoice = {
        "CustomerRef": {"value": customer_id},
        "Line": lines,
    }
    if due_date:
        invoice["DueDate"] = due_date
    return qbo_request("POST", "invoice", invoice)