import {
  CREATE as MSSQL_CREATE,
  GET_NEXT_SORT as MSSQL_GET_NEXT_SORT,
} from '../../providers/mssql/queries/attributevalue.js';
import {
  CREATE as SQLITE_CREATE,
  GET_NEXT_SORT as SQLITE_GET_NEXT_SORT,
} from '../../providers/sqlite3/queries/attributevalue.js';
import {
  GET_BY_COMPANY_AND_ID as MSSQL_GET_ATTR,
} from '../../providers/mssql/queries/attributename.js';
import {
  GET_BY_COMPANY_AND_ID as SQLITE_GET_ATTR,
} from '../../providers/sqlite3/queries/attributename.js';
import { isUniqueConstraintError } from '../../providers/provider.js';
import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
import makeRunner from '../runner.js';

export default function create(provider) {
  const access = resolveSelectedCompanyAccess(provider);
  const isSqlite = provider?.dialect === 'sqlite3';
  const getAttrSql = isSqlite ? SQLITE_GET_ATTR : MSSQL_GET_ATTR;
  const getSortSql = isSqlite ? SQLITE_GET_NEXT_SORT : MSSQL_GET_NEXT_SORT;
  const createSql = isSqlite ? SQLITE_CREATE : MSSQL_CREATE;

  /**
   * Creates an attribute value under a given attribute.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {number} attributeId - The attribute id.
   * @param {object} input - Input value data.
   * @param {string} input.value - The value text.
   * @param {number} [input.sort] - Optional sort order.
   * @param {object} [tx] - Optional transaction.
   * @returns {Promise<{id: number, attributeId: number, value: string, sort: number}>}
   *
   * @throws {Error} If the value is missing, the attribute is unknown, or the value already exists for the attribute.
   */
  return async (googleAuthId, attributeId, input = {}, tx) => {
    const attrId = Number(attributeId);
    if (!Number.isInteger(attrId) || attrId <= 0) {
      throw new Error('Invalid attributeId');
    }
    const value = input.value?.trim();
    if (!value) {
      throw new Error('Value required');
    }

    const runner = makeRunner(provider, tx);
    const { companyId } = await access(googleAuthId, tx);

    const attrRes = await runner.query(getAttrSql, { id: attrId, companyId });
    if (!attrRes.rows[0]) {
      throw new Error('Attribute name not found');
    }

    let sort = input.sort;
    if (sort == null || !Number.isInteger(sort)) {
      const next = await runner.query(getSortSql, { attributeId: attrId });
      sort = next.rows[0].sort;
    }

    let result;
    try {
      result = await runner.query(createSql, {
        attributeId: attrId,
        value,
        sort,
      });
    } catch (err) {
      if (isUniqueConstraintError(err)) {
        throw new Error('Attribute value already exists');
      }
      throw err;
    }

    const id = result.rows[0]?.id ?? result.insertId;
    return {
      id,
      attributeId: attrId,
      value,
      sort,
    };
  };
}