import * as mssqlArticle from '../../providers/mssql/queries/article.js';
import * as sqliteArticle from '../../providers/sqlite3/queries/article.js';
import { GET_CHILD_COUNT as MSSQL_GET_CHILD_COUNT } from '../../providers/mssql/queries/articleDelete.js';
import { GET_CHILD_COUNT as SQLITE_GET_CHILD_COUNT } from '../../providers/sqlite3/queries/articleDelete.js';
import { INSERT as MSSQL_INSERT_HISTORY } from '../../providers/mssql/queries/articlehistory.js';
import { INSERT as SQLITE_INSERT_HISTORY } from '../../providers/sqlite3/queries/articlehistory.js';
import queryBySku from './queryBySku.js';
import resolveArticleBySku from './resolveArticleBySku.js';
import makeRunner from '../runner.js';

export default function setFatherBySku(provider) {
  const resolve = resolveArticleBySku(provider);
  const load = queryBySku(provider);
  const isSqlite = provider?.dialect === 'sqlite3';

  const queries = isSqlite ? sqliteArticle : mssqlArticle;
  const getChildCountSql = isSqlite ? SQLITE_GET_CHILD_COUNT : MSSQL_GET_CHILD_COUNT;
  const insertHistorySql = isSqlite ? SQLITE_INSERT_HISTORY : MSSQL_INSERT_HISTORY;

  /**
   * Links an article to a father article (V/K compound) by their SKUs.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {string} sku - The child article SKU.
   * @param {string|null} fatherSku - The father article SKU, or `null` to unlink.
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<object>} The updated child article.
   * @throws {Error} If the article or father is not found, or the link is invalid.
   *
   * @example
   * const article = await store.article.setFatherBySku(42, '42001190-1', '42001190');
   * // => { id, sku, name, fatherSku: '42001190', ... }
   */
  return async (googleAuthId, sku, fatherSku, tx) => {
    const runSet = async (runner) => {
      const { articleId, languageId, companyId, companyuserId } = await resolve(googleAuthId, sku, runner);

      const childTextRes = await runner.query(
        'SELECT name FROM articletext WHERE article_id = @articleId AND language_id = @languageId',
        { articleId, languageId },
      );
      const childName = childTextRes.rows[0]?.name || sku;

      if (fatherSku == null || fatherSku === '') {
        const prevFatherRes = await runner.query(
          'SELECT fatherarticle_id FROM article WHERE id = @articleId',
          { articleId },
        );
        const prevFatherId = prevFatherRes.rows[0]?.fatherarticle_id;

        await runner.query(queries.UPDATE_FATHER_BY_SKU, {
          sku,
          companyId,
          fatherArticleId: null,
        });

        if (prevFatherId) {
          const prevFatherTextRes = await runner.query(
            'SELECT sku FROM article WHERE id = @prevFatherId',
            { prevFatherId },
          );
          const prevFatherSku = prevFatherTextRes.rows[0]?.sku || String(prevFatherId);

          await runner.query(insertHistorySql, {
            articleId,
            companyuserId,
            text: `Artikel "${sku}" von Vaterartikel "${prevFatherSku}" getrennt`,
          });

          await runner.query(insertHistorySql, {
            articleId: prevFatherId,
            companyuserId,
            text: `Variante "${childName}" (${sku}) getrennt`,
          });
        }

        const unlinked = await load(articleId, languageId, runner);
        if (!unlinked) {
          throw new Error('Article not found');
        }
        return unlinked;
      }

      const father = await runner.query(
        'SELECT id, is_father, sku FROM article WHERE sku = @sku AND (@companyId IS NULL OR company_id = @companyId)',
        { sku: fatherSku, companyId },
      );
      const fatherRow = father.rows[0];
      const fatherId = fatherRow?.id;
      if (!fatherId) {
        throw new Error('Father not found');
      }
      if (fatherId === articleId) {
        throw new Error('Invalid father');
      }

      const wasFather = Boolean(fatherRow.is_father);

      const existingSortsRes = await runner.query(
        'SELECT fathersort FROM article WHERE fatherarticle_id = @fatherId ORDER BY fathersort ASC',
        { fatherId },
      );
      const usedSorts = new Set(existingSortsRes.rows.map((r) => Number(r.fathersort)));
      let fathersort = 0;
      while (usedSorts.has(fathersort)) {
        fathersort++;
      }

      await runner.query(queries.UPDATE_FATHER_BY_SKU, {
        sku,
        companyId,
        fatherArticleId: fatherId,
        fathersort,
      });

      await runner.query(queries.SET_IS_FATHER, {
        articleId: fatherId,
      });

      if (!wasFather) {
        await runner.query(insertHistorySql, {
          articleId: fatherId,
          companyuserId,
          text: 'Artikel zu Vaterartikel konvertiert',
        });
      }

      await runner.query(insertHistorySql, {
        articleId: fatherId,
        companyuserId,
        text: `Variante "${childName}" (${sku}) hinzugefügt`,
      });

      await runner.query(insertHistorySql, {
        articleId,
        companyuserId,
        text: `Artikel "${sku}" als Variante von "${fatherSku}" zugewiesen`,
      });

      const article = await load(articleId, languageId, runner);
      if (!article) {
        throw new Error('Article not found');
      }

      return article;
    };

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