# Exempel på kodregel för fakturauppdatering i Python
import requests
import datetime

class FortnoxInvoiceFilter:
    def __init__(self, access_token):
        self.headers = {
            "Authorization": f"Bearer {access_token},
            "Content-Type": "application/json"
        }
        self.base_url = "https://api.fortnox.se/3"

    def filter_customer_invoices(self, customer_number, status, from_date, to_date):
        """Hämta fakturor för specifik kund med filtrering på status och datum"""
        url = f"{self.base_url}/invoices"
        params = {
            "filter": "customernumber",
            "customernumber": customer_number,
            "status": status,
            "fromdate": from_date,
            "todate": to_date
        }
        try:
            response = requests.get(url, headers=self.headers, params=params, timeout=10)
            response.raise_for_status() # Raise HTTPError for bad responses (4xx or 5xx)
            return response.json().get("Invoices", [])
        except requests.exceptions.RequestException as e:
            print(f"Fel vid API-anrop (filter_customer_invoices): {e}")
            return []

    def update_payment_terms(self, invoices):
        """Uppdatera betalningsvillkor baserat på interna regler"""
        payment_rules = {
            "10001": "30", # VIP kund - 30 dagar
            "20001": "20", # Standardkund - 20 dagar
            "30001": "10"  # Kund med förseningshistorik - 10 dagar
        }
        updated_count = 0
        for invoice in invoices:
            invoice_number = invoice.get("DocumentNumber")
            customer_number = invoice.get("CustomerNumber")
            if not invoice_number or customer_number not in payment_rules:
                continue

            new_terms = payment_rules[customer_number]
            update_data = { "Invoice": { "TermsOfPayment": new_terms } } # Correct field name? Verify API docs
            url = f"{self.base_url}/invoices/{invoice_number}"

            try:
                response = requests.put(url, headers=self.headers, json=update_data, timeout=10)
                response.raise_for_status()
                if response.status_code == 200:
                    print(f"Uppdaterade faktura {invoice_number} med nya villkor: {new_terms} dagar")
                    updated_count += 1
            except requests.exceptions.RequestException as e:
                print(f"Fel vid API-anrop (update_payment_terms for {invoice_number}): {e}")
      
        return updated_count

# --- Exempel på användning ---
fortnox = FortnoxInvoiceFilter(ACCESS_TOKEN)

# Datumintervall
today = datetime.date.today() # Use date objects for date comparisons
three_months_ago = today - datetime.timedelta(days=90)
from_date_str = three_months_ago.strftime("%Y-%m-%d")
to_date_str = today.strftime("%Y-%m-%d")

print(f"Söker obetalda fakturor för kund 10001 mellan {from_date_str} och {to_date_str}...")

invoices_to_check = fortnox.filter_customer_invoices(
    customer_number="10001",
    status="unpaid", # Ensure 'unpaid' is a valid status filter
    from_date=from_date_str,
    to_date=to_date_str
)

if invoices_to_check:
    print(f"Hittade {len(invoices_to_check)} obetalda fakturor. Försöker uppdatera villkor...")
    updated_count = fortnox.update_payment_terms(invoices_to_check)
    print(f"Totalt {updated_count} fakturor uppdaterade med nya betalningsvillkor.")
else:
    print("Inga matchande fakturor hittades för uppdatering.")