"""AI Suggestion model for tracking AI-applied changes to flows."""
import uuid
from datetime import datetime, timezone
from typing import Optional

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

from app.core.database import Base


class AISuggestion(Base):
    __tablename__ = "ai_suggestions"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    tree_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("trees.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("ai_chat_sessions.id", ondelete="SET NULL"),
        nullable=True,
    )
    action_type: Mapped[str] = mapped_column(
        String(50), nullable=False
    )
    target_node_id: Mapped[Optional[str]] = mapped_column(
        String(255), nullable=True
    )
    changes_json: Mapped[dict] = mapped_column(
        JSONB, nullable=False, default=dict
    )
    status: Mapped[str] = mapped_column(
        String(20), nullable=False, default="pending"
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        nullable=False,
    )
    resolved_at: Mapped[Optional[datetime]] = mapped_column(
        DateTime(timezone=True), nullable=True
    )