import { first, isEmpty } from 'lodash'

import { BioimpedanceWithWeight } from '../models/bioimpedance-with-weight.model'
import { CompetitionCompetitor } from '../../../models/ranking'

import { ScoreCalculatorParams, ScoreCalculatorResult } from './score.calculator'

export abstract class GenericScoreCalculator {
  static calcule({ bioimpedance, competitor }: ScoreCalculatorParams): ScoreCalculatorResult {
    const value = this.getValue(bioimpedance)

    if (isEmpty(competitor.history)) return { value, score: 0 }

    return { value, score: this.getDifferencePercentage(this.getFirstValue(competitor), value) || 0 }
  }

  protected static getValue(_bioimpedance: BioimpedanceWithWeight): number {
    return 0
  }

  protected static getFirstValue = (competitor: CompetitionCompetitor): number =>
    first(competitor.history.sort((before, after) => (before.done_at < after.done_at ? -1 : 1))).value

  private static getDifferencePercentage = (firstValue: number, currentValue: number): number =>
    ((firstValue - currentValue) * 100) / firstValue
}