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

from __future__ import annotations

import uuid
from datetime import datetime
from typing import Any

from sqlalchemy import String, Text, DateTime, ForeignKey, func, Index, Integer
from sqlalchemy.dialects.postgresql import UUID as PGUUID, JSONB
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)