import * as mssqlArticle from '../../providers/mssql/queries/article.js';
import * as sqliteArticle from '../../providers/sqlite3/queries/article.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 { UPDATE_BY_ARTICLE_AND_LANGUAGE as MSSQL_UPDATE_TEXT } from '../../providers/mssql/queries/articletext.js';
import { UPDATE_BY_ARTICLE_AND_LANGUAGE as SQLITE_UPDATE_TEXT } from '../../providers/sqlite3/queries/articletext.js';
import { GET_DETAIL_BY_ARTICLE_ID as MSSQL_GET_DETAIL } from '../../providers/mssql/queries/articleDetail.js';
import { GET_DETAIL_BY_ARTICLE_ID as SQLITE_GET_DETAIL } from '../../providers/sqlite3/queries/articleDetail.js';
import { GET_FULL_BY_SI as MSSQL_GET_UNIT } from '../../providers/mssql/queries/unit.js';
import { GET_FULL_BY_SI as SQLITE_GET_UNIT } from '../../providers/sqlite3/queries/unit.js';
import queryBySku from './queryBySku.js';
import resolveArticleBySku from './resolveArticleBySku.js';
import makeRunner from '../runner.js';
import slugify from '../slugify.js';

function formatUnitLabel(amount, symbol) {
  const sym = symbol ?? '';
  if (amount == null || !Number.isFinite(Number(amount))) {
    return sym;
  }
  return `${Number(amount)}${sym}`;
}

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

  const articleQueries = isSqlite ? sqliteArticle : mssqlArticle;
  const insertHistorySql = isSqlite ? SQLITE_INSERT_HISTORY : MSSQL_INSERT_HISTORY;
  const updateTextSql = isSqlite ? SQLITE_UPDATE_TEXT : MSSQL_UPDATE_TEXT;
  const getDetailSql = isSqlite ? SQLITE_GET_DETAIL : MSSQL_GET_DETAIL;
  const getUnitSql = isSqlite ? SQLITE_GET_UNIT : MSSQL_GET_UNIT;

  /**
   * Updates an article's name and/or unit (SI and amount), recording history.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {string} sku - The article SKU.
   * @param {object} patch - The update patch.
   * @param {string} [patch.name] - The new article name.
   * @param {string} [patch.unitSi] - The new unit SI code.
   * @param {number} [patch.unitamount] - The new unit amount (must be > 0).
   * @param {boolean|number} [patch.track_stock] - Whether inventory stock is tracked.
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<object>} The updated article.
   * @throws {Error} If no valid field is provided or the article is not found.
   *
   * @example
   * const article = await store.article.updateBySku(42, 'SKU-1', { name: 'Cola 1L', unitSi: 'l', unitamount: 1, track_stock: true });
   * // => { id, sku, name, ... }
   */
  return async (googleAuthId, sku, patch = {}, tx) => {
    const hasName = Object.prototype.hasOwnProperty.call(patch, 'name');
    const hasUnitamount = Object.prototype.hasOwnProperty.call(patch, 'unitamount');
    const hasUnitSi = Object.prototype.hasOwnProperty.call(patch, 'unitSi');
    const hasTrackStock =
      Object.prototype.hasOwnProperty.call(patch, 'track_stock') ||
      Object.prototype.hasOwnProperty.call(patch, 'trackStock');

    if (!hasName && !hasUnitamount && !hasUnitSi && !hasTrackStock) {
      throw new Error('Name required');
    }

    if (hasName && !patch.name?.trim()) {
      throw new Error('Name required');
    }

    if (hasUnitamount && (!Number.isFinite(patch.unitamount) || patch.unitamount <= 0)) {
      throw new Error('Invalid unitamount');
    }

    const rawTrackStock = Object.prototype.hasOwnProperty.call(patch, 'track_stock')
      ? patch.track_stock
      : patch.trackStock;
    if (hasTrackStock && typeof rawTrackStock !== 'boolean' && rawTrackStock !== 0 && rawTrackStock !== 1) {
      throw new Error('Invalid track_stock');
    }

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

      const currentResult = await runner.query(getDetailSql, {
        articleId,
        languageId,
      });
      const current = currentResult.rows[0];
      if (!current) {
        throw new Error('Article not found');
      }

      let unitId;
      let newUnitSymbol = current.unitSymbol ?? current.unitSi ?? '';
      if (hasUnitSi) {
        if (!patch.unitSi?.trim()) {
          throw new Error('Unit not found');
        }
        const unit = await runner.query(getUnitSql, {
          companyId,
          si: patch.unitSi.trim(),
          languageId,
        });
        const unitRow = unit.rows[0];
        unitId = unitRow?.id;
        if (!unitId) {
          throw new Error('Unit not found');
        }
        newUnitSymbol = unitRow.symbol ?? unitRow.si ?? '';
      }

      const historyLines = [];
      if (hasName) {
        const oldName = current.name ?? '';
        const newName = patch.name.trim();
        if (oldName !== newName) {
          historyLines.push(`Name geändert von "${oldName}" auf "${newName}"`);
        }
      }
      if (hasUnitSi || hasUnitamount) {
        const oldLabel = formatUnitLabel(
          current.unitamount,
          current.unitSymbol ?? current.unitSi ?? '',
        );
        const newLabel = formatUnitLabel(
          hasUnitamount ? patch.unitamount : current.unitamount,
          newUnitSymbol,
        );
        if (oldLabel !== newLabel) {
          historyLines.push(`Einheit geändert von "${oldLabel}" auf "${newLabel}"`);
        }
      }
      if (hasTrackStock) {
        const oldTrack = Boolean(current.track_stock ?? 1);
        const newTrack = Boolean(rawTrackStock);
        if (oldTrack !== newTrack) {
          historyLines.push(
            `Bestandsführung geändert von "${oldTrack ? 'Ja' : 'Nein'}" auf "${newTrack ? 'Ja' : 'Nein'}"`,
          );
        }
      }

      if (hasName) {
        const slug = slugify(patch.name);
        const update = await runner.query(updateTextSql, {
          articleId,
          languageId,
          name: patch.name.trim(),
          slug,
        });

        if (!update.rowsAffected) {
          throw new Error('Article not found');
        }
      }

      if (hasUnitSi && hasUnitamount) {
        await runner.query(articleQueries.UPDATE_UNIT_AND_AMOUNT, {
          articleId,
          unitId,
          unitamount: patch.unitamount,
        });
      } else if (hasUnitSi) {
        await runner.query(articleQueries.UPDATE_UNIT, {
          articleId,
          unitId,
        });
      } else if (hasUnitamount) {
        await runner.query(articleQueries.UPDATE_UNITAMOUNT, {
          articleId,
          unitamount: patch.unitamount,
        });
      }

      if (hasTrackStock) {
        await runner.query(articleQueries.UPDATE_TRACK_STOCK, {
          articleId,
          trackStock: Boolean(rawTrackStock) ? 1 : 0,
        });
      }

      if (historyLines.length) {
        await runner.query(insertHistorySql, {
          articleId,
          companyuserId,
          text: historyLines.join('\n'),
        });
      }

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

      return article;
    };

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