import { GET_BY_COMPANYUSER_AND_ID as MSSQL_GET } from '../../providers/mssql/queries/modelconversation.js';
import { GET_BY_COMPANYUSER_AND_ID as SQLITE_GET } from '../../providers/sqlite3/queries/modelconversation.js';
import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
import makeRunner from '../runner.js';
import shape from './shape.js';

export default function get(provider) {
  const access = resolveSelectedCompanyAccess(provider);
  const sql = provider?.dialect === 'sqlite3' ? SQLITE_GET : MSSQL_GET;

  /**
   * Gets a single model conversation by ID for the user in the selected company.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {number} conversationId - The conversation id.
   * @param {object} [tx] - Optional transaction to run within.
   * @returns {Promise<{id: number, companyuser_id: number, provider: string, model: string, created_at: string, updated_at: string, state: string, started_by: number|null}>}
   * @throws {Error} 'Conversation not found'.
   */
  return async (googleAuthId, conversationId, tx) => {
    const id = Number(conversationId);
    if (!Number.isInteger(id) || id <= 0) {
      throw new Error('Conversation not found');
    }

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

    const result = await runner.query(sql, { id, companyuserId });
    if (!result.rows[0]) throw new Error('Conversation not found');
    return shape(result.rows[0]);
  };
}