import * as Updates from 'expo-updates';
import { Platform } from 'react-native';

import * as env from './environment';
import { AppConfig, Stage } from './types';

const envConfig = env.environmentVariables as EnvironmentConfig;

const environments: Record<Stage, AppConfig> = {
  [Stage.Development]: env.dev,
  [Stage.Local]: env.local,
  [Stage.Production]: env.prod,
};

function getStagWeb(): Stage {
  return envConfig.stage;
}

function getStageApp(): Stage {
  const channel = Updates.releaseChannel || '';
  const isProd = channel.includes(Stage.Production);
  if (isProd) {
    return Stage.Production;
  }

  return envConfig.stage;
}

const getStage = Platform.select({
  default: getStageApp,
  web: getStagWeb,
});

export function getAppConfig() {
  const stage = getStage();

  const configuration = environments[stage];

  return configuration;
}

export const config = getAppConfig();

interface EnvironmentConfig {
  stage: Stage;
}