from typing import List, Literal, Optional
from pydantic import BaseModel, Field

SignalType = Literal["BUY", "SELL", "HOLD", "STRONG BUY", "STRONG SELL"]
VolatilityLevel = Literal["Low", "Medium", "High"]

class Candle(BaseModel):
    date: str
    price: float

class ForecastPoint(BaseModel):
    day: int
    price: float
    lower: float
    upper: float

class PredictionResponse(BaseModel):
    ticker: str
    currentPrice: float
    targetPrice: float
    predictedChange: float
    signal: SignalType
    rsi: float
    macd: str
    volatility: VolatilityLevel
    historicalPrices: List[Candle]
    predictedPrice: float
    forecastData: List[ForecastPoint]

class HistoryResponse(BaseModel):
    ticker: str
    historicalPrices: List[Candle]

class ChartForecastPoint(BaseModel):
    date: str
    price: float
    lower: float
    upper: float

class ChartForecastResponse(BaseModel):
    ticker: str
    points: List[ChartForecastPoint]

class HealthResponse(BaseModel):
    status: str
    modelLoaded: bool
    version: str = Field(default="1.0.0")