"""Pydantic models for alerts."""
from datetime import datetime
from typing import Literal, Optional
from pydantic import BaseModel, Field


class AlertConfig(BaseModel):
    """Alert configuration model."""
    enabled: bool = True
    positive_threshold: float = Field(0.1, description="Alert when FR > this value (%)")
    negative_threshold: float = Field(-0.1, description="Alert when FR < this value (%)")
    volume_spike_multiplier: float = Field(2.0, description="Alert when volume > avg * this value")


class AlertItem(BaseModel):
    """Single alert item."""
    symbol: str
    alert_type: Literal["high_positive_fr", "high_negative_fr", "volume_spike"]
    value: float
    threshold: float
    message: str
    timestamp: datetime


class AlertCheckResponse(BaseModel):
    """Response model for alert check endpoint."""
    success: bool = True
    alerts: list[AlertItem]
    total_alerts: int
    checked_at: datetime