from fastapi import APIRouter
from app.services.exchange import ExchangeRateService
from datetime import datetime

router = APIRouter()
service = ExchangeRateService()


@router.get("/convert")
async def convert_currency(
    from_currency: str = "USD",
    to_currency: str = "CNY",
    amount: float = 1.0,
):
    rate = await service.get_rate(from_currency, to_currency)
    if rate is None:
        return {"error": f"No rate available for {from_currency} -> {to_currency}"}

    return {
        "from_currency": from_currency.upper(),
        "to_currency": to_currency.upper(),
        "amount": amount,
        "converted": round(amount * rate, 2),
        "rate": rate,
        "updated_at": datetime.utcnow().isoformat(),
    }


@router.get("/rates")
async def get_rates(base: str = "USD"):
    rates = await service.get_all_rates(base)
    return {
        "base": base.upper(),
        "rates": rates,
        "updated_at": datetime.utcnow().isoformat(),
    }