/**
 * pgvector + cards.embedding for Layer-0 visual catalog search.
 *
 * @type {import('node-pg-migrate').ColumnDefinitions | undefined}
 */
export const shorthands = undefined;

/** Must match lib/card-embed.js EMBED_DIMENSION. */
const EMBED_DIMENSION = 1024;

/**
 * @param {import('node-pg-migrate').MigrationBuilder} pgm
 */
export const up = (pgm) => {
  pgm.sql(`
    CREATE EXTENSION IF NOT EXISTS vector;

    ALTER TABLE cards
      ADD COLUMN IF NOT EXISTS embedding vector(${EMBED_DIMENSION}),
      ADD COLUMN IF NOT EXISTS embedded_at TIMESTAMP;

    CREATE INDEX IF NOT EXISTS idx_cards_embedding_hnsw
      ON cards USING hnsw (embedding vector_cosine_ops)
      WHERE embedding IS NOT NULL;
  `);
};

/**
 * @param {import('node-pg-migrate').MigrationBuilder} pgm
 */
export const down = (pgm) => {
  throw new Error('Down migration not supported for add-card-embeddings');
};