"""Fundamentals router — fundamental data endpoints."""

import json

from fastapi import APIRouter, Depends
from sqlalchemy.ext.asyncio import AsyncSession

from app.dependencies import get_db, require_access
from app.schemas.common import APIEnvelope
from app.schemas.fundamental import FundamentalResponse
from app.services.fundamental_service import get_fundamental

router = APIRouter(tags=["fundamentals"])


def _parse_unavailable_fields(raw_json: str) -> dict[str, str]:
    """Deserialize unavailable_fields_json, defaulting to {} on invalid JSON."""
    try:
        parsed = json.loads(raw_json)
    except (json.JSONDecodeError, TypeError):
        return {}
    if not isinstance(parsed, dict):
        return {}
    return {k: v for k, v in parsed.items() if isinstance(k, str) and isinstance(v, str)}


@router.get("/fundamentals/{symbol}", response_model=APIEnvelope)
async def read_fundamentals(
    symbol: str,
    _user=Depends(require_access),
    db: AsyncSession = Depends(get_db),
) -> APIEnvelope:
    """Get latest fundamental data for a symbol."""
    record = await get_fundamental(db, symbol)

    if record is None:
        data = FundamentalResponse(symbol=symbol.strip().upper())
    else:
        data = FundamentalResponse(
            symbol=symbol.strip().upper(),
            pe_ratio=record.pe_ratio,
            revenue_growth=record.revenue_growth,
            earnings_surprise=record.earnings_surprise,
            market_cap=record.market_cap,
            fetched_at=record.fetched_at,
            unavailable_fields=_parse_unavailable_fields(record.unavailable_fields_json),
        )

    return APIEnvelope(status="success", data=data.model_dump())