from datetime import datetime

from pydantic import BaseModel


class PriceHistoryResponse(BaseModel):
    """Response model for a price history record."""

    id: int
    source: str
    pair: str
    price: float
    timestamp: datetime
    created_at: datetime


class ExchangeConfigResponse(BaseModel):
    """Exchange configuration for the frontend."""

    eur_min_buy: int
    eur_max_buy: int
    eur_min_sell: int
    eur_max_sell: int
    eur_increment: int
    premium_buy: int
    premium_sell: int
    small_trade_threshold_eur: int
    small_trade_extra_premium: int


class PriceResponse(BaseModel):
    """Current BTC/EUR price for trading.

    Note: The actual agreed price depends on trade direction (buy/sell)
    and is calculated by the frontend using market_price and premium values.
    Premium calculation: base premium for direction + extra premium if
    trade <= threshold.
    """

    market_price: float  # Raw price from exchange
    timestamp: datetime
    is_stale: bool


class ExchangePriceResponse(BaseModel):
    """Combined price and configuration response."""

    price: PriceResponse | None  # None if price fetch failed
    config: ExchangeConfigResponse
    error: str | None = None