"""Notification channel configuration per account.

Each account can have multiple notification configs (email, Slack webhook, Teams webhook).
Each config specifies which events it receives.
"""
import uuid
from datetime import datetime, timezone
from typing import Optional, Any, TYPE_CHECKING

from sqlalchemy import String, Boolean, DateTime, ForeignKey, CheckConstraint
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB

from app.core.database import Base

if TYPE_CHECKING:
    from app.models.account import Account


class NotificationConfig(Base):
    __tablename__ = "notification_configs"
    __table_args__ = (
        CheckConstraint(
            "channel IN ('email', 'slack_webhook', 'teams_webhook')",
            name="ck_notification_configs_channel",
        ),
    )

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    account_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    channel: Mapped[str] = mapped_column(String(20), nullable=False)
    webhook_url: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
    email_addresses: Mapped[Optional[list]] = mapped_column(JSONB, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    events_enabled: Mapped[dict[str, Any]] = mapped_column(
        JSONB, default=lambda: {
            "session.escalated": True,
            "session.high_priority": True,
            "proposal.pending": True,
            "proposal.approved": True,
            "knowledge_gap.detected": True,
        }
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )

    account: Mapped[Optional["Account"]] = relationship("Account", foreign_keys=[account_id])