"""Copilot conversation model for in-session AI assistant.

Tracks conversation state during flow navigation with contextual AI help.
"""
import uuid
from datetime import datetime, timezone
from typing import Optional, Any

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

from app.core.database import Base


class CopilotConversation(Base):
    __tablename__ = "copilot_conversations"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    account_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("accounts.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("sessions.id", ondelete="SET NULL"),
        nullable=True,
    )
    tree_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("trees.id", ondelete="CASCADE"),
        nullable=False,
    )
    messages: Mapped[list[dict[str, Any]]] = mapped_column(
        JSONB, nullable=False, default=list
    )
    current_node_id: Mapped[Optional[str]] = mapped_column(
        String(100), nullable=True
    )
    message_count: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0
    )
    total_input_tokens: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0
    )
    total_output_tokens: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0
    )
    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),
    )
    expires_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False
    )