"""AI Conversation and Message models — tenant-scoped with RLS."""

from __future__ import annotations

import uuid
from typing import Any

from sqlalchemy import ForeignKey, Index, Integer, String, Text
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.dialects.postgresql import UUID as PGUUID
from sqlalchemy.orm import Mapped, mapped_column

from app.core.db import Base, TenantMixin


class AIConversation(Base, TenantMixin):
    """AI Copilot conversation thread — tenant-scoped."""

    __tablename__ = "ai_conversations"
    __table_args__ = (Index("ix_ai_conversations_tenant_user", "tenant_id", "user_id"),)

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    title: Mapped[str] = mapped_column(String(255), nullable=False, default="Untitled")
    context: Mapped[dict[str, Any]] = mapped_column(JSONB, default=dict, nullable=False)


class AIMessage(Base, TenantMixin):
    """Individual messages within an AI conversation — user input, AI response, actions."""

    __tablename__ = "ai_messages"
    __table_args__ = (Index("ix_ai_messages_tenant_conversation", "tenant_id", "conversation_id"),)

    id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
    )
    conversation_id: Mapped[uuid.UUID] = mapped_column(
        PGUUID(as_uuid=True),
        ForeignKey("ai_conversations.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    role: Mapped[str] = mapped_column(String(20), nullable=False)  # user, assistant, system
    content: Mapped[str] = mapped_column(Text, nullable=False)
    proposed_actions: Mapped[list[dict[str, Any]] | None] = mapped_column(JSONB, nullable=True)
    executed_action: Mapped[dict[str, Any] | None] = mapped_column(JSONB, nullable=True)
    execution_result: Mapped[dict[str, Any] | None] = mapped_column(JSONB, nullable=True)
    message_index: Mapped[int] = mapped_column(Integer, nullable=False, default=0)