import * as mssqlPic from '../../providers/mssql/queries/articlepic.js';
import * as sqlitePic from '../../providers/sqlite3/queries/articlepic.js';
import resolveArticleBySku from './resolveArticleBySku.js';
import { recordImageOrderHistory } from '../articlehistory/record.js';
import makeRunner from '../runner.js';

export default function orderImages(provider) {
  const resolve = resolveArticleBySku(provider);
  const isSqlite = provider?.dialect === 'sqlite3';
  const queries = isSqlite ? sqlitePic : mssqlPic;

  /**
   * Reorders the images of an article by its SKU.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {string} sku - The article SKU.
   * @param {object} input - The reorder input.
   * @param {Array<string>} input.fullHashes - The full image hashes in their new order.
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<{fullHashes: Array<string>}>} The applied order.
   * @throws {Error} If the order is invalid.
   *
   * @example
   * const result = await store.article.orderImages(42, 'SKU-1', { fullHashes: ['a', 'b'] });
   * // => { fullHashes: ['a', 'b'] }
   */
  return async (googleAuthId, sku, { fullHashes }, tx) => {
    if (!Array.isArray(fullHashes)) {
      throw new Error('Invalid image order');
    }

    const runOrder = async (runner) => {
      const { articleId, companyuserId } = await resolve(googleAuthId, sku, runner);

      const current = await runner.query(queries.LIST_HASHES_BY_ARTICLE, { articleId });
      const existing = new Set(current.rows.map((r) => r.fullHash));

      if (fullHashes.length !== existing.size) {
        throw new Error('Invalid image order');
      }

      const seen = new Set();
      for (const fullHash of fullHashes) {
        if (!existing.has(fullHash) || seen.has(fullHash)) {
          throw new Error('Invalid image order');
        }
        seen.add(fullHash);
      }

      await runner.query(queries.SET_TEMP_SORTS, { articleId });

      for (let sort = 0; sort < fullHashes.length; sort++) {
        const update = await runner.query(queries.UPDATE_SORT_BY_HASH, {
          articleId,
          fullHash: fullHashes[sort],
          sort,
        });

        if (!update.rowsAffected) {
          throw new Error('Invalid image order');
        }
      }

      const oldOrder = current.rows.map((r) => r.fullHash);
      const isSameOrder = oldOrder.length === fullHashes.length && oldOrder.every((h, i) => h === fullHashes[i]);
      if (!isSameOrder) {
        await recordImageOrderHistory(runner, {
          articleId,
          companyuserId,
          fullHashes,
        });
      }

      return { fullHashes };
    };

    if (tx) {
      return runOrder(makeRunner(provider, tx));
    }
    if (typeof provider?.transaction === 'function') {
      return provider.transaction(runOrder);
    }
    return runOrder(makeRunner(provider));
  };
}