scorer.php

<?php

class Scorer {

  private $canonical;

  private $game;

  public function __construct($game)
  {
    $this->game = $game;

    $this->canonical = Game::whereCanonical(true)
      ->whereStageId($this->game->stage_id)->first();
  }

  public function totalScore()
  {
    $scorableRounds = array(
      'rd1', 'rd2', 'rd3', 'rd4', 'rd5', 'qf', 'sf', 'f'); 

    $pointsMatrix = array(
      'rd1' => 50, 'rd2' => 100, 'rd3' => 150, 'rd4' => 200,
      'rd5' => 300, 'qf' => 450, 'sf' => 800, 'f'  => 1000,
    );

    $points = 0;

    foreach ($scorableRounds as $roundSlug)
    {
      $points += $this->score($roundSlug) * $pointsMatrix[$roundSlug];
    }

    return $points;
  }

  public function score($round_slug)
  {
    $heats_ids = Heat::getByRoundAndStage(
      $round_slug, $this->game->stage_id
    )->lists('id');

    if ($this->canonical == null) {
      return 0;
    }

    $intersect = array_intersect(
      $this->surfersByGameAndHeats($this->canonical->id, $heats_ids),
      $this->surfersByGameAndHeats($this->game->id, $heats_ids)
    );

    return count($intersect);
  }

  private function surfersByGameAndHeats($game_id, $heats_ids)
  {
    return Ride::whereGameId($game_id)
      ->whereIn('heat_id', $heats_ids)
      ->wherePoints(6)
      ->lists('surfer_id');
  }

}