from uuid import UUID
from decimal import Decimal

from sqlalchemy import select, func
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.case import Case
from app.models.assessment import FraudAssessment, ReviewStatus


async def recalculate_case_total(case_id: UUID, db: AsyncSession) -> float:
    """Recalculate and persist the total confirmed fraud amount for a case."""
    result = await db.execute(
        select(func.coalesce(func.sum(FraudAssessment.assessed_amount), 0))
        .where(FraudAssessment.case_id == case_id)
        .where(FraudAssessment.review_status == ReviewStatus.confirmed)
    )
    total = float(result.scalar() or 0)
    case = await db.get(Case, case_id)
    if case:
        case.total_amount = total
        await db.flush()
    return total