import * as mssqlQueries from '../../providers/mssql/queries/articlesupplier.js';
import * as sqliteQueries from '../../providers/sqlite3/queries/articlesupplier.js';
import resolveArticleBySku from '../article/resolveArticleBySku.js';
import taxEnsure from '../tax/ensure.js';
import {
  assertSupplier,
  optionalString,
  resolveCompanyDefaultTax,
  shapeArticleSupplier,
} from './helpers.js';
import { recordSupplierAddHistory } from '../articlehistory/record.js';
import makeRunner from '../runner.js';

export default function create(provider) {
  const resolve = resolveArticleBySku(provider);
  const ensureTax = taxEnsure(provider);
  const isSqlite = provider?.dialect === 'sqlite3';

  const queries = isSqlite ? sqliteQueries : mssqlQueries;

  /**
   * Assigns a supplier to an article, optionally creating a purchase price.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {string} sku - The article SKU.
   * @param {object} input - The supplier assignment input.
   * @param {number} input.entityId - The id of the supplier entity.
   * @param {string} [input.sku] - The supplier's item number/SKU.
   * @param {number} [input.pu] - Packaging unit (defaults to 1).
   * @param {number|null} [input.stock] - Current stock at the supplier.
   * @param {number} [input.sort] - Display sort order (defaults to next sort).
   * @param {number|null} [input.netPrice] - Net purchase price.
   * @param {number} [input.taxId] - The tax id for the purchase price.
   * @param {number} [input.taxRate] - The tax rate in percent (used if taxId is not provided).
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<{id: number, articleId: number, entityId: number, supplierName: string|null, sku: string|null, pu: number, stock: number|null, sort: number, price: {net: number, taxId: number, taxRate?: number}|null}>} The created assignment.
   * @throws {Error} If input is invalid, article or supplier is not found, or supplier is already assigned.
   *
   * @example
   * const created = await store.articlesupplier.create(42, 'SKU-1', {
   *   entityId: 88,
   *   sku: 'MET-44910',
   *   pu: 1,
   *   netPrice: 4.20,
   * });
   * // => { id, articleId, entityId, supplierName, sku, pu, stock, sort, price }
   */
  return async (googleAuthId, sku, input = {}, tx) => {
    const entityId = input.entityId;
    if (entityId == null || !Number.isFinite(entityId)) {
      throw new Error('Supplier required');
    }

    const pu = input.pu === undefined || input.pu === null ? 1 : input.pu;
    if (!Number.isFinite(pu) || pu <= 0) {
      throw new Error('Invalid pu');
    }

    const supplierSku = optionalString(input.sku);

    const stock =
      input.stock === undefined || input.stock === null ? null : input.stock;
    if (stock !== null && !Number.isFinite(stock)) {
      throw new Error('Invalid stock');
    }

    if (input.sort !== undefined && input.sort !== null) {
      if (!Number.isFinite(input.sort)) {
        throw new Error('Invalid sort');
      }
    }

    const netPrice =
      input.netPrice === undefined || input.netPrice === null
        ? null
        : input.netPrice;
    if (netPrice !== null && !Number.isFinite(netPrice)) {
      throw new Error('Invalid price');
    }

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

      const artCheck = await runner.query('SELECT is_parent FROM article WHERE id = @articleId', { articleId });
      if (artCheck.rows[0]?.is_parent) {
        throw new Error('A parent article cannot have suppliers');
      }

      await assertSupplier(runner, companyId, entityId);

      const existingCheck = await runner.query(queries.CHECK_EXISTS, {
        articleId,
        entityId,
      });

      if (existingCheck.rows[0]) {
        throw new Error('Supplier already assigned');
      }

      let sort = input.sort;
      if (sort === undefined || sort === null) {
        const sortRes = await runner.query(queries.GET_NEXT_SORT, {
          articleId,
        });
        sort = sortRes.rows[0].sort;
      }

      let taxId = null;
      if (netPrice !== null) {
        taxId = input.taxId;
        if (taxId == null || !Number.isFinite(taxId)) {
          if (input.taxRate != null && Number.isFinite(input.taxRate)) {
            taxId = await ensureTax(input.taxRate, runner);
          } else {
            const defaultTaxId = await resolveCompanyDefaultTax(
              runner,
              companyId,
            );
            taxId = defaultTaxId != null ? defaultTaxId : await ensureTax(0, runner);
          }
        }
      }

      const createdRes = await runner.query(queries.CREATE, {
        articleId,
        entityId,
        net: netPrice,
        taxId,
        sku: supplierSku,
        stock,
        pu,
        sort,
      });

      const createdId = createdRes.rows[0]?.id ?? createdRes.insertId;

      const loadRes = await runner.query(queries.GET_BY_ID_AND_ARTICLE_ID, {
        id: createdId,
        articleId,
        companyId,
      });

      const supplierRow = loadRes.rows[0];
      const supplierName =
        supplierRow?.supplierName ?? (entityId ? `Lieferant #${entityId}` : 'Lieferant');

      const actualSku = supplierRow?.sku ?? supplierSku;
      const actualPrice = supplierRow?.priceNet ?? netPrice;

      await recordSupplierAddHistory(runner, {
        articleId,
        companyuserId,
        supplierName,
        supplierSku: actualSku,
        netPrice: actualPrice,
      });

      return shapeArticleSupplier(supplierRow);
    };

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