from fastapi import APIRouter
import logging
from ..clients.firefly_client import firefly_client

logger = logging.getLogger("reports_router")

router = APIRouter()


@router.get("/spending-by-category")
async def spending_by_category():
    try:
        transactions = await firefly_client.get_transactions()
        logger.info("Fetched %d transactions from Firefly for reports", len(transactions))
        category_totals = {}

        for transaction in transactions:
            attrs = transaction.get("attributes", {})
            legs = attrs.get("transactions", []) or []

            for leg in legs:
                try:
                    leg_amount = float(leg.get("amount", 0))
                except Exception:
                    leg_amount = 0.0

                leg_type = (leg.get("type") or "").lower()
                # we consider 'withdrawal' legs as spending
                if leg_type == "withdrawal" or (leg.get("destination_type") or "").lower().startswith("expense"):
                    category_name = leg.get("category_name") or leg.get("category") or attrs.get("category_name") or attrs.get("category_id") or "Uncategorized"
                    category_totals[category_name] = category_totals.get(category_name, 0) + abs(leg_amount)

        data = [
            {"name": name, "amount": amount}
            for name, amount in sorted(category_totals.items(), key=lambda item: item[1], reverse=True)
        ]

        return {"data": data}
    except Exception as e:
        logger.exception("Error computing spending-by-category: %s", e)
        # Return 500 with message for frontend debugging
        from fastapi import HTTPException

        raise HTTPException(status_code=500, detail="Error fetching report data")