"""Add feedback_events table and vibe_embedding to playlists

Revision ID: 004
Revises: 003
Create Date: 2026-02-23

"""
from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op
from pgvector.sqlalchemy import Vector

revision: str = "004"
down_revision: Union[str, None] = "003"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Add vibe_embedding to playlists (nullable — only set for vibe playlists)
    op.add_column("playlists", sa.Column("vibe_embedding", Vector(512), nullable=True))

    # Create feedback_events table
    op.create_table(
        "feedback_events",
        sa.Column("id", sa.BigInteger, primary_key=True),
        sa.Column("playlist_id", sa.BigInteger, sa.ForeignKey("playlists.id"), nullable=False),
        sa.Column("track_id", sa.BigInteger, sa.ForeignKey("tracks.id"), nullable=False),
        sa.Column("vibe_embedding", Vector(512), nullable=False),
        sa.Column("vibe_text", sa.Text, nullable=True),
        sa.Column("signal", sa.Text, nullable=False),
        sa.Column("signal_weight", sa.REAL, nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )

    # B-tree index on track_id (primary query pattern: fetch events by track)
    op.create_index("ix_feedback_events_track_id", "feedback_events", ["track_id"])


def downgrade() -> None:
    op.drop_index("ix_feedback_events_track_id", table_name="feedback_events")
    op.drop_table("feedback_events")
    op.drop_column("playlists", "vibe_embedding")