from datetime import datetime
from typing import Optional

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel
from sqlmodel import Session, col, func, select

from app.auth import get_current_user
from app.db import get_session
from app.models.models import Transaction, TransactionRead, TransactionType
from app.services.exchange_rate import get_converted_amount_expr

router = APIRouter(prefix="/salarios", tags=["salarios"])

SALARIO_TYPES = (TransactionType.SALARY, TransactionType.DEPOSITO)


class SalariosSummary(BaseModel):
    count: int
    total_amount: float
    latest_date: Optional[datetime] = None


@router.get("/", response_model=list[TransactionRead])
def list_salarios(
    limit: int = Query(default=50, le=500),
    offset: int = 0,
    session: Session = Depends(get_session),
    _user: str = Depends(get_current_user),
):
    query = (
        select(Transaction)
        .where(col(Transaction.transaction_type).in_(SALARIO_TYPES))
        .order_by(col(Transaction.date).desc())
        .offset(offset)
        .limit(limit)
    )
    return session.exec(query).all()


@router.get("/summary", response_model=SalariosSummary)
def salarios_summary(
    session: Session = Depends(get_session),
    _user: str = Depends(get_current_user),
):
    amount_crc = get_converted_amount_expr(session)
    result = session.exec(
        select(
            func.count(),
            func.coalesce(func.sum(amount_crc), 0),
            func.max(Transaction.date),
        ).where(col(Transaction.transaction_type).in_(SALARIO_TYPES))
    ).first()
    return SalariosSummary(
        count=result[0] if result else 0,
        total_amount=float(result[1]) if result else 0.0,
        latest_date=result[2] if result else None,
    )