from datetime import datetime, timezone
import uuid
from sqlalchemy import Column, String, JSON, DateTime, UniqueConstraint, ForeignKey, Boolean, Integer
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import declarative_base
from sqlalchemy.orm import relationship

Base = declarative_base()

class Priority(Base):
    """SQLAlchemy model for channel URL priorities"""
    __tablename__ = "priorities"
    
    id = Column(Integer, primary_key=True)
    description = Column(String, nullable=False)

class ChannelDB(Base):
    """SQLAlchemy model for IPTV channels"""
    __tablename__ = "channels"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tvg_id = Column(String, nullable=False)
    name = Column(String, nullable=False)
    group_title = Column(String, nullable=False)
    tvg_name = Column(String)

    __table_args__ = (
        UniqueConstraint('group_title', 'name', name='uix_group_title_name'),
    )
    tvg_logo = Column(String)
    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
    
    # Relationship with ChannelURL
    urls = relationship("ChannelURL", back_populates="channel", cascade="all, delete-orphan")

class ChannelURL(Base):
    """SQLAlchemy model for channel URLs"""
    __tablename__ = "channels_urls"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    channel_id = Column(UUID(as_uuid=True), ForeignKey('channels.id', ondelete='CASCADE'), nullable=False)
    url = Column(String, nullable=False)
    in_use = Column(Boolean, default=False, nullable=False)
    priority_id = Column(Integer, ForeignKey('priorities.id'), nullable=False)
    created_at = Column(DateTime, default=lambda: datetime.now(timezone.utc))
    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))

    # Relationships
    channel = relationship("ChannelDB", back_populates="urls")
    priority = relationship("Priority")