from datetime import datetime
from typing import Optional, List
from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Text, JSON
from sqlalchemy.orm import relationship
from backend.database import Base

class Channel(Base):
    __tablename__ = "channels"
    
    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, unique=True, nullable=False, index=True)
    type = Column(String, nullable=False)
    config = Column(JSON, default=dict)
    tags = Column(JSON, default=list)
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    notifications = relationship("Notification", back_populates="channel")

class Notification(Base):
    __tablename__ = "notifications"
    
    id = Column(Integer, primary_key=True, index=True)
    channel_id = Column(Integer, ForeignKey("channels.id"))
    title = Column(String, nullable=True)
    body = Column(Text, nullable=False)
    priority = Column(String, default="normal")
    status = Column(String, default="pending")
    error_msg = Column(Text, nullable=True)
    sent_at = Column(DateTime, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    
    channel = relationship("Channel", back_populates="notifications")