from datetime import date

import sqlalchemy as sa

from app import db
from app.models import LeaveBalance, WorkEntry


def compute_leave_used(year: int) -> dict[str, int]:
    start = date(year, 1, 1)
    end = date(year, 12, 31)

    conges = (
        db.session.scalar(
            sa.select(sa.func.count()).where(
                WorkEntry.date.between(start, end),
                WorkEntry.day_type == "CONGE",
            )
        )
        or 0
    )

    rtt = (
        db.session.scalar(
            sa.select(sa.func.count()).where(
                WorkEntry.date.between(start, end),
                WorkEntry.day_type == "RTT",
            )
        )
        or 0
    )

    return {"conges": conges, "rtt": rtt}


def get_or_create_balance(year: int) -> LeaveBalance:
    balance = db.session.scalar(sa.select(LeaveBalance).where(LeaveBalance.year == year))
    if balance is None:
        balance = LeaveBalance(year=year)
        db.session.add(balance)
        db.session.commit()
    return balance