import logging
from sqlalchemy.sql import func
from app.reports import reports
from app import db
from app.common.responses import success_response

from app.classes.customer import Customer_Customer

from app.classes.delivery import Delivery_Delivery

logger = logging.getLogger(__name__)


@reports.route("/oil/total", methods=["GET"])
def oil_total_gallons():
    logger.info("GET /reports/oil/total - Calculating total oil delivered")
    total_oil = db.session\
    .query(func.sum(Delivery_Delivery.gallons_delivered))\
    .group_by(Delivery_Delivery.id)\
    .all()

    return success_response({"oil": total_oil})

@reports.route("/customers/list", methods=["GET"])
def customer_list():
    """
    Retrieve a list of customers with selected fields for printing.
    Returns account number, first name, last name, address, town, and phone number.
    Ordered by last name from A to Z.
    """
    logger.info("GET /reports/customers/list - Fetching customer list for reports")

    customers = db.session.query(Customer_Customer).order_by(Customer_Customer.customer_last_name.asc()).all()
    customer_data = [
        {
            "account_number": customer.account_number,
            "first_name": customer.customer_first_name,
            "last_name": customer.customer_last_name,
            "address": customer.customer_address,
            "town": customer.customer_town,
            "phone_number": customer.customer_phone_number
        }
        for customer in customers
    ]
    return success_response({"customers": customer_data})