"""
Copyright 2024-2026 ChatterMate

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

import uuid

from sqlalchemy import Column, Boolean, DateTime, ForeignKey, UniqueConstraint
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from sqlalchemy.dialects.postgresql import UUID

from app.database import Base


class AgentChannelConfig(Base):
    """Routes a connected channel account to the AI agent that answers it.

    One config per channel account: every inbound conversation on that
    account is handled by the mapped agent.
    """
    __tablename__ = "agent_channel_configs"

    __table_args__ = (
        UniqueConstraint('channel_account_id', name='uq_agent_channel_config_account'),
    )

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    agent_id = Column(
        UUID(as_uuid=True),
        ForeignKey("agents.id", ondelete="CASCADE"),
        nullable=False,
        index=True
    )
    channel_account_id = Column(
        UUID(as_uuid=True),
        ForeignKey("channel_accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True
    )
    is_active = Column(Boolean, nullable=False, default=True)

    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    agent = relationship("Agent")
    account = relationship("ChannelAccount")