import { Strategy } from './strategy';
import { Context } from '../context';
import normalizedValue from '../../hash';

export default class GradualRolloutUserIdStrategy extends Strategy {
  constructor() {
    super('gradualRolloutUserId');
  }

  isEnabled(parameters: any, context: Context) {
    const { userId } = context;
    if (!userId) {
      return false;
    }

    const percentage = Number(parameters.percentage);
    const groupId = parameters.groupId || '';

    const normalizedUserId = normalizedValue(userId, groupId);

    return percentage > 0 && normalizedUserId <= percentage;
  }
}