"""add context assemblies

Revision ID: 20260522_context_assemblies
Revises: 20260521_context_memory_compaction_jobs
Create Date: 2026-05-22
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa


revision = "20260522_context_assemblies"
down_revision = "20260521_context_memory_compaction_jobs"
branch_labels = None
depends_on = None


TABLE_NAME = "pmflow_ai_context_assemblies"


def _table_exists(table_name: str) -> bool:
    return sa.inspect(op.get_bind()).has_table(table_name)


def _index_exists(table_name: str, index_name: str) -> bool:
    if not _table_exists(table_name):
        return False
    inspector = sa.inspect(op.get_bind())
    return any(item.get("name") == index_name for item in inspector.get_indexes(table_name))


def _create_index_once(index_name: str, table_name: str, columns: list[str]) -> None:
    if _table_exists(table_name) and not _index_exists(table_name, index_name):
        op.create_index(index_name, table_name, columns)


def upgrade() -> None:
    if not _table_exists(TABLE_NAME):
        op.create_table(
            TABLE_NAME,
            sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
            sa.Column("public_assembly_id", sa.String(length=80), nullable=False),
            sa.Column("thread_id", sa.BigInteger(), nullable=True),
            sa.Column("user_id", sa.BigInteger(), nullable=True),
            sa.Column("qa_session_id", sa.BigInteger(), nullable=True),
            sa.Column("run_public_id", sa.String(length=80), nullable=True),
            sa.Column("context_packet_version", sa.String(length=80), nullable=True),
            sa.Column("user_question_preview", sa.Text(), nullable=True),
            sa.Column("assembly_payload", sa.JSON(), nullable=True),
            sa.Column("observability_payload", sa.JSON(), nullable=True),
            sa.Column("used_context_payload", sa.JSON(), nullable=True),
            sa.Column("retrieval_critic_payload", sa.JSON(), nullable=True),
            sa.Column("grounding_payload", sa.JSON(), nullable=True),
            sa.Column("replay_payload", sa.JSON(), nullable=True),
            sa.Column("assembled_at", sa.TIMESTAMP(), nullable=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.text("now()"), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.text("now()"), nullable=False),
            sa.ForeignKeyConstraint(["qa_session_id"], ["qa_sessions.id"], ondelete="SET NULL"),
            sa.ForeignKeyConstraint(["thread_id"], ["pmflow_ai_threads.id"], ondelete="SET NULL"),
            sa.ForeignKeyConstraint(["user_id"], ["users.id"]),
            sa.PrimaryKeyConstraint("id"),
            sa.UniqueConstraint("tenant_id", "public_assembly_id", name="uq_pmflow_ai_context_assemblies_public_id"),
        )

    _create_index_once("ix_ctx_assemblies_tenant_id", TABLE_NAME, ["tenant_id"])
    _create_index_once("ix_ctx_assemblies_public_id", TABLE_NAME, ["public_assembly_id"])
    _create_index_once("ix_ctx_assemblies_thread_id", TABLE_NAME, ["thread_id"])
    _create_index_once("ix_ctx_assemblies_user_id", TABLE_NAME, ["user_id"])
    _create_index_once("ix_ctx_assemblies_qa_session_id", TABLE_NAME, ["qa_session_id"])
    _create_index_once("ix_ctx_assemblies_run_public_id", TABLE_NAME, ["run_public_id"])
    _create_index_once("ix_ctx_assemblies_assembled_at", TABLE_NAME, ["assembled_at"])


def downgrade() -> None:
    if _table_exists(TABLE_NAME):
        op.drop_table(TABLE_NAME)