"""Add persistent assistant conversations and messages.

Revision ID: 20260831_0011
Revises: 20260830_0010
Create Date: 2026-08-31
"""

from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op
from sqlalchemy.dialects import postgresql

revision: str = "20260831_0011"
down_revision: str | None = "20260830_0010"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.create_table(
        "conversations",
        sa.Column("id", sa.BigInteger(), autoincrement=True, nullable=False),
        sa.Column("user_id", sa.BigInteger(), nullable=False),
        sa.Column("title", sa.String(length=120), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["user_id"], ["user_accounts.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_conversations_user_updated", "conversations", ["user_id", "updated_at"])

    op.create_table(
        "conversation_messages",
        sa.Column("id", sa.BigInteger(), autoincrement=True, nullable=False),
        sa.Column("conversation_id", sa.BigInteger(), nullable=False),
        sa.Column("role", sa.String(length=20), nullable=False),
        sa.Column("content", sa.Text(), nullable=False),
        sa.Column(
            "structured_data",
            postgresql.JSONB(astext_type=sa.Text()),
            server_default="{}",
            nullable=False,
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["conversation_id"], ["conversations.id"], ondelete="CASCADE"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index(
        "ix_conversation_messages_conversation_created",
        "conversation_messages",
        ["conversation_id", "created_at"],
    )


def downgrade() -> None:
    op.drop_table("conversation_messages")
    op.drop_table("conversations")