from datetime import datetime, timedelta, date

from fastapi import APIRouter, Depends, Security
from sqlalchemy import func
from sqlalchemy.orm import Session

from barker.core.config import settings
from ...models import Voucher, VoucherType, Settlement, Reprint, SettleOption, Inventory, SaleCategory, Kot, Product
from ...schemas.auth import UserToken
from ...core.security import get_current_active_user as get_user
from ...db.session import SessionLocal

router = APIRouter()


# Dependency
def get_db() -> Session:
    try:
        db = SessionLocal()
        yield db
    finally:
        db.close()


@router.get("")
def discount_report_view(
    s: str = None,
    f: str = None,
    db: Session = Depends(get_db),
    user: UserToken = Security(get_user, scopes=["discount-report"]),
):
    start_date = date.today() if s is None else datetime.strptime(s, "%d-%b-%Y").date()
    finish_date = date.today() if f is None else datetime.strptime(f, "%d-%b-%Y").date()
    if (date.today() - start_date).days > 5 and "accounts-audit" not in user.permissions:
        raise ValueError("Accounts Audit")

    return {
        "startDate": start_date.strftime("%d-%b-%Y"),
        "finishDate": finish_date.strftime("%d-%b-%Y"),
        "amounts": discount_report(start_date, finish_date, db),
    }


def discount_report(s: date, f: date, db: Session):
    start_date = s + timedelta(minutes=settings.NEW_DAY_OFFSET_MINUTES)
    finish_date = f + timedelta(days=1, minutes=settings.NEW_DAY_OFFSET_MINUTES)

    amount = func.sum(Inventory.quantity * Inventory.effective_price * Inventory.discount).label("Amount")
    list_ = (
        db.query(SaleCategory.name, amount)
        .join(Voucher.kots)
        .join(Kot.inventories)
        .join(Inventory.product)
        .join(Product.sale_category)
        .filter(
            Inventory.discount != 0,
            Voucher.date >= start_date,
            Voucher.date <= finish_date,
            Voucher.voucher_type.in_([VoucherType.REGULAR_BILL.value, VoucherType.KOT.value]),
        )
        .group_by(SaleCategory.name)
        .order_by(SaleCategory.name)
        .all()
    )

    return [{"name": pg, "amount": amt} for pg, amt in list_]