import { IApplicationContext } from '@/application/Context/IApplicationContext';
import { OperatingSystem } from '@/domain/OperatingSystem';
import { IApplication } from '@/domain/IApplication';
import { Environment } from '@/infrastructure/Environment/Environment';
import { IEnvironment } from '@/infrastructure/Environment/IEnvironment';
import { IApplicationFactory } from '../IApplicationFactory';
import { ApplicationFactory } from '../ApplicationFactory';
import { ApplicationContext } from './ApplicationContext';

export async function buildContext(
  factory: IApplicationFactory = ApplicationFactory.Current,
  environment = Environment.CurrentEnvironment,
): Promise<IApplicationContext> {
  if (!factory) { throw new Error('missing factory'); }
  if (!environment) { throw new Error('missing environment'); }
  const app = await factory.getApp();
  const os = getInitialOs(app, environment);
  return new ApplicationContext(app, os);
}

function getInitialOs(app: IApplication, environment: IEnvironment): OperatingSystem {
  const currentOs = environment.os;
  const supportedOsList = app.getSupportedOsList();
  if (supportedOsList.includes(currentOs)) {
    return currentOs;
  }
  supportedOsList.sort((os1, os2) => {
    const getPriority = (os: OperatingSystem) => app.getCollection(os).totalScripts;
    return getPriority(os2) - getPriority(os1);
  });
  return supportedOsList[0];
}