from pydantic import BaseModel
from typing import Optional, Dict, Any, List
from datetime import datetime


class MessageCreate(BaseModel):
    """Schema for creating a message."""
    content: str
    session_id: Optional[str] = None


class MessageResponse(BaseModel):
    """Schema for message response."""
    id: str
    session_id: str
    role: str
    content: str
    meta: Optional[Dict[str, Any]] = None
    created_at: datetime
    
    class Config:
        from_attributes = True


class ChatRequest(BaseModel):
    """Schema for chat request."""
    message: str
    session_id: Optional[str] = None
    policy_ids: Optional[List[str]] = None


class ChatResponse(BaseModel):
    """Schema for chat response."""
    message: MessageResponse
    session_id: str
    agent: Optional[str] = None