"""add kg sync runs table

Revision ID: add_kg_sync_runs
Revises: add_qa_session_state_table
Create Date: 2026-03-02
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa

try:
    from sqlalchemy.dialects.postgresql import JSONB
except Exception:  # pragma: no cover
    JSONB = sa.JSON


# revision identifiers, used by Alembic.
revision = "add_kg_sync_runs"
down_revision = "add_qa_session_state_table"
branch_labels = None
depends_on = None


def _json_type(bind):
    return JSONB() if bind.dialect.name == "postgresql" else sa.JSON()


def _table_exists(bind, table_name: str) -> bool:
    inspector = sa.inspect(bind)
    return inspector.has_table(table_name)


def _index_exists(bind, table_name: str, index_name: str) -> bool:
    inspector = sa.inspect(bind)
    indexes = inspector.get_indexes(table_name)
    return any(idx.get("name") == index_name for idx in indexes)


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


def _drop_index_if_exists(bind, index_name: str, table_name: str) -> None:
    if _index_exists(bind, table_name, index_name):
        op.drop_index(index_name, table_name=table_name)


def upgrade() -> None:
    bind = op.get_bind()

    if not _table_exists(bind, "kg_sync_runs"):
        op.create_table(
            "kg_sync_runs",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False, server_default="1"),
            sa.Column("created_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.Column("updated_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now(), onupdate=sa.func.now()),
            sa.Column("run_type", sa.String(length=40), nullable=False),
            sa.Column("trigger_source", sa.String(length=40), nullable=False, server_default="system"),
            sa.Column("status", sa.String(length=20), nullable=False, server_default="running"),
            sa.Column("started_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.Column("ended_at", sa.TIMESTAMP(), nullable=True),
            sa.Column("duration_ms", sa.Integer(), nullable=True),
            sa.Column("input_payload", _json_type(bind), nullable=True),
            sa.Column("result_payload", _json_type(bind), nullable=True),
            sa.Column("error_message", sa.Text(), nullable=True),
        )

    _create_index_if_not_exists(bind, "ix_kg_sync_runs_tenant_id", "kg_sync_runs", ["tenant_id"])
    _create_index_if_not_exists(bind, "ix_kg_sync_runs_run_type", "kg_sync_runs", ["run_type"])
    _create_index_if_not_exists(bind, "ix_kg_sync_runs_trigger_source", "kg_sync_runs", ["trigger_source"])
    _create_index_if_not_exists(bind, "ix_kg_sync_runs_status", "kg_sync_runs", ["status"])
    _create_index_if_not_exists(bind, "ix_kg_sync_runs_started_at", "kg_sync_runs", ["started_at"])
    _create_index_if_not_exists(bind, "ix_kg_sync_runs_ended_at", "kg_sync_runs", ["ended_at"])


def downgrade() -> None:
    bind = op.get_bind()
    if not _table_exists(bind, "kg_sync_runs"):
        return

    _drop_index_if_exists(bind, "ix_kg_sync_runs_ended_at", "kg_sync_runs")
    _drop_index_if_exists(bind, "ix_kg_sync_runs_started_at", "kg_sync_runs")
    _drop_index_if_exists(bind, "ix_kg_sync_runs_status", "kg_sync_runs")
    _drop_index_if_exists(bind, "ix_kg_sync_runs_trigger_source", "kg_sync_runs")
    _drop_index_if_exists(bind, "ix_kg_sync_runs_run_type", "kg_sync_runs")
    _drop_index_if_exists(bind, "ix_kg_sync_runs_tenant_id", "kg_sync_runs")
    op.drop_table("kg_sync_runs")