/**
 * Remove legacy Lorcana catalog rows that predate bulk import normalization.
 * Remaps collection_cards to canonical TFC printings where possible.
 */
export const shorthands = undefined;

export const up = (pgm) => {
  // Remap collection_cards from orphan Elsa/Mickey rows to canonical TFC printings.
  pgm.sql(`
    UPDATE collection_cards cc
    SET card_id = canonical.id
    FROM cards orphan
    JOIN cards canonical ON canonical.game = 'Lorcana'
      AND canonical.name = orphan.name
      AND canonical.set_code = orphan.set_code
      AND canonical.scryfall_id ~ '^[A-Za-z]{2,4}-[0-9]{3}$'
    WHERE cc.card_id = orphan.id
      AND orphan.game = 'Lorcana'
      AND (orphan.scryfall_id IS NULL OR orphan.scryfall_id !~ '^[A-Za-z]{2,4}-[0-9]{3}$')
      AND NOT EXISTS (
        SELECT 1 FROM collection_cards existing
        WHERE existing.collection_id = cc.collection_id
          AND existing.card_id = canonical.id
      );
  `);

  // Drop collection refs that would duplicate after remap.
  pgm.sql(`
    DELETE FROM collection_cards cc
    USING cards orphan
    WHERE cc.card_id = orphan.id
      AND orphan.game = 'Lorcana'
      AND (orphan.scryfall_id IS NULL OR orphan.scryfall_id !~ '^[A-Za-z]{2,4}-[0-9]{3}$');
  `);

  // Delete unreferenced legacy rows (variant collector numbers, null external ids).
  pgm.sql(`
    DELETE FROM cards c
    WHERE c.game = 'Lorcana'
      AND (c.scryfall_id IS NULL OR c.scryfall_id !~ '^[A-Za-z]{2,4}-[0-9]{3}$')
      AND NOT EXISTS (SELECT 1 FROM user_cards uc WHERE uc.card_id = c.id)
      AND NOT EXISTS (SELECT 1 FROM deck_cards dc WHERE dc.card_id = c.id)
      AND NOT EXISTS (SELECT 1 FROM collection_cards cc WHERE cc.card_id = c.id);
  `);
};

export const down = () => {
  throw new Error('Irreversible data cleanup');
};