"""Add pipeline_stats table and User.pipeline_tuning

Revision ID: 003
Revises: 002
Create Date: 2026-05-11
"""
from typing import Sequence, Union

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

revision: str = "003"
down_revision: Union[str, None] = "002"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # ── users: add pipeline_tuning ──
    op.add_column("users", sa.Column(
        "pipeline_tuning", postgresql.JSONB(), nullable=True
    ))

    # ── pipeline_stats ──
    op.create_table(
        "pipeline_stats",
        sa.Column("id", sa.String(36), primary_key=True),
        sa.Column("user_id", postgresql.UUID(),
                  sa.ForeignKey("users.id", ondelete="CASCADE"),
                  nullable=True, index=True),
        sa.Column("stage", sa.String(50), nullable=False, index=True),
        sa.Column("passed", sa.Boolean(), nullable=False),
        sa.Column("reason", sa.String(255), nullable=True),
        sa.Column("duration_ms", sa.Integer(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True),
                  nullable=False),
    )

    # composite index for stats aggregation
    op.create_index(
        "ix_pipeline_stats_user_stage",
        "pipeline_stats",
        ["user_id", "stage"],
    )


def downgrade() -> None:
    op.drop_index("ix_pipeline_stats_user_stage", table_name="pipeline_stats")
    op.drop_table("pipeline_stats")
    op.drop_column("users", "pipeline_tuning")