import { POS_GROUP_NAME } from '../../providers/mssql/queries/entity.js';
import { CREATE as MSSQL_CREATE } from '../../providers/mssql/queries/company.js';
import { CREATE as SQLITE_CREATE } from '../../providers/sqlite3/queries/company.js';
import { CREATE as MSSQL_CREATE_CATEGORY } from '../../providers/mssql/queries/category.js';
import { CREATE as SQLITE_CREATE_CATEGORY } from '../../providers/sqlite3/queries/category.js';
import {
  CREATE_WITHOUT_COMPANY as MSSQL_CREATE_CUSTOMERGROUP,
  SET_COMPANY as MSSQL_SET_CUSTOMERGROUP_COMPANY,
} from '../../providers/mssql/queries/customergroup.js';
import {
  CREATE_WITHOUT_COMPANY as SQLITE_CREATE_CUSTOMERGROUP,
  SET_COMPANY as SQLITE_SET_CUSTOMERGROUP_COMPANY,
} from '../../providers/sqlite3/queries/customergroup.js';
import { ADD as MSSQL_ADD_COMPANYUSER } from '../../providers/mssql/queries/companyuser.js';
import { ADD as SQLITE_ADD_COMPANYUSER } from '../../providers/sqlite3/queries/companyuser.js';
import langEnsure from '../lang/ensure.js';
import taxEnsure from '../tax/ensure.js';
import makeRunner from '../runner.js';

export default function create(provider) {
  const ensureLang = langEnsure(provider);
  const ensureTax = taxEnsure(provider);

  const isSqlite = provider?.dialect === 'sqlite3';
  const createCategorySql = isSqlite ? SQLITE_CREATE_CATEGORY : MSSQL_CREATE_CATEGORY;
  const createCustGroupSql = isSqlite ? SQLITE_CREATE_CUSTOMERGROUP : MSSQL_CREATE_CUSTOMERGROUP;
  const createCompanySql = isSqlite ? SQLITE_CREATE : MSSQL_CREATE;
  const setCustGroupCompanySql = isSqlite ? SQLITE_SET_CUSTOMERGROUP_COMPANY : MSSQL_SET_CUSTOMERGROUP_COMPANY;
  const addCompanyUserSql = isSqlite ? SQLITE_ADD_COMPANYUSER : MSSQL_ADD_COMPANYUSER;

  /**
   * Creates a new company together with its root category, POS customer group,
   * default language and tax rates, and links it to the given Google auth user.
   *
   * @param {object} input - The company creation input.
   * @param {string} input.iso639 - The ISO 639 language code for the company.
   * @param {string} input.name - The company name.
   * @param {number} input.taxrate - The standard tax rate in percent.
   * @param {number} input.reducedtaxrate - The reduced tax rate in percent.
   * @param {number} input.googleAuthId - The id of the Google auth user to link.
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<{id: number, rootCategoryId: number, languageId: number, taxrateId: number, reducedtaxrateId: number, taxfreerateId: number, posCustomerGroupId: number}>} The created company ids.
   *
   * @example
   * const company = await store.company.create({
   *   iso639: 'de',
   *   name: 'Acme',
   *   taxrate: 19,
   *   reducedtaxrate: 7,
   *   googleAuthId: 42,
   * });
   * // => { id, rootCategoryId, languageId, taxrateId, reducedtaxrateId, taxfreerateId, posCustomerGroupId }
   */
  return async ({ iso639, name, taxrate, reducedtaxrate, googleAuthId }, tx) => {
    const runCreate = async (runner) => {

      const languageId = await ensureLang(iso639, runner);
      const taxrateId = await ensureTax(taxrate, runner);
      const reducedtaxrateId = await ensureTax(reducedtaxrate, runner);
      const taxfreerateId = await ensureTax(0, runner);

      const category = await runner.query(createCategorySql, {
        parentId: null,
        sort: 0,
      });
      const rootCategoryId = category.rows[0]?.id ?? category.insertId;

      // Circular FK: create POS group first (company_id null), company with
      // poscustomergroup_id NOT NULL, then link the group back to the company.
      const posGroup = await runner.query(createCustGroupSql, {
        name: POS_GROUP_NAME,
        sort: 0,
      });
      const posCustomerGroupId = posGroup.rows[0]?.id ?? posGroup.insertId;

      const result = await runner.query(createCompanySql, {
        name,
        rootCategoryId,
        languageId,
        taxrate: taxrateId,
        reducedtaxrate: reducedtaxrateId,
        taxfreerate: taxfreerateId,
        posCustomerGroupId,
      });
      const companyId = result.rows[0]?.id ?? result.insertId;

      await runner.query(setCustGroupCompanySql, {
        id: posCustomerGroupId,
        companyId,
      });

      // The creator becomes the company's admin.
      await runner.query(addCompanyUserSql, {
        companyId,
        googleAuthId,
        role: 'admin',
      });

      return {
        id: companyId,
        rootCategoryId,
        languageId,
        taxrateId,
        reducedtaxrateId,
        taxfreerateId,
        posCustomerGroupId,
      };
    };

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