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<?php |
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namespace App\Services; |
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use App\Entities\Contest; |
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use App\Entities\Solution; |
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use App\Entities\Team; |
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use App\Entities\User; |
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use App\Repositories\Criteria\WhereIn; |
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use App\Repositories\UserRepository; |
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use Carbon\Carbon; |
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use Illuminate\Database\Eloquent\Collection; |
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class Ranking |
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{ |
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/** @var Team[] */ |
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private $teams = []; |
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private $contest; |
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public function __construct(Contest $contest) |
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{ |
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$this->contest = $contest; |
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$solutions = $this->getValidSolutions($contest); |
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foreach ($solutions as $solution) { |
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$this->addSolution($solution); |
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} |
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} |
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private function addSolution(Solution $solution) |
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{ |
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if (!array_key_exists($solution->user_id, $this->teams)) { |
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$this->teams[$solution->user_id] = new Team($this->contest); |
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} |
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$this->teams[$solution->user_id]->addSolution($solution); |
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} |
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/** |
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* @return Team[] |
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*/ |
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public function result() |
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{ |
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/** @var $result Team[] */ |
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$result = []; |
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$this->initTeam(); |
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foreach ($this->teams as $team) { |
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$inserted = false; |
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$totalSolutions = count($result); |
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for ($i = 0; $i < $totalSolutions; $i++) { |
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if ($this->isBetter($team, $result[$i])) { |
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$result = $this->insertElementAtIndex($result, $team, $i); |
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$inserted = true; |
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} |
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} |
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if (!$inserted) { |
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$result[] = $team; |
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} |
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} |
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return $result; |
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} |
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/** |
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* @param Team $team |
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* @param Team $current |
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* |
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* @return bool |
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*/ |
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private function isBetter($team, $current) |
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{ |
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// accept more |
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if ($team->numberOfAccept() > $current->numberOfAccept()) { |
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return true; |
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} |
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// accept equal, but penalty less |
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if ($team->numberOfAccept() == $current->numberOfAccept() |
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&& $team->totalPenalty() < $current->totalPenalty()) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @return Collection|User[] |
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*/ |
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protected function getTeams() |
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{ |
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$repo = app(UserRepository::class); |
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$whereIn = new WhereIn('id', $this->getTeamsId()); |
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$repo->pushCriteria($whereIn); |
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return $repo->all(); |
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} |
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/** |
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* @return array |
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*/ |
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private function getTeamsId() |
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{ |
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return array_keys($this->teams); |
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} |
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protected function insertElementAtIndex($arr, $ele, $index) |
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{ |
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$start = array_slice($arr, 0, $index); |
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$end = array_slice($arr, $index); |
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$start[] = $ele; |
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return array_merge($start, $end); |
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} |
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/** |
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* 在比赛开始和结束之间的提交才是比赛的合法提交. |
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* |
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* @param Contest $contest |
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* |
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* @return Collection|Solution[] |
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*/ |
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private function getValidSolutions($contest) |
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{ |
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$columns = ['created_at', 'order', 'user_id', 'result', 'id']; |
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$start_at = Carbon::parse($contest->start_time)->subSeconds(1); |
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$end_at = Carbon::parse($contest->end_time)->addSeconds(1); |
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return $contest->solutions()->whereBetween('created_at', [$start_at, $end_at])->get($columns); |
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} |
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private function initTeam() |
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{ |
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foreach ($this->getTeams() as $user) { |
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$this->teams[$user->id]->setUser($user); |
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} |
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} |
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} |
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hustoj /
hustoj-neo
