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<?php |
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namespace SecretSanta; |
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use SecretSanta\Exceptions\PlayerException; |
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use SecretSanta\Exceptions\SecretSantaException; |
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/** |
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* Class SecretSanta |
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* @package SecretSanta |
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*/ |
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class SecretSanta |
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{ |
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/** @var PlayersCollection */ |
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private $players; |
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/** @var array */ |
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private $combination; |
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/** |
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* SecretSanta constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->players = new PlayersCollection(); |
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} |
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/** |
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* Add single player to the game |
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* @param string $name |
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* @param string $email |
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* @return SecretSanta |
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*/ |
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public function addPlayer($name, $email) |
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{ |
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$this->players->addPlayer(Player::create($name, $email)); |
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return $this; |
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} |
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/** |
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* Add two excluded players to the game |
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* @param string $name |
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* @param string $email |
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* @param string $coupleName |
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* @param string $coupleEmail |
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* @return SecretSanta |
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*/ |
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public function addCouple($name, $email, $coupleName, $coupleEmail) |
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{ |
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$this->players->addCouple( |
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Player::create($name, $email), |
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Player::create($coupleName, $coupleEmail) |
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); |
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return $this; |
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} |
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/** |
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* Add multiple exclusive players to the game |
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* @param array $playersData |
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* @return $this |
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* @throws SecretSantaException |
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*/ |
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public function addExclusivePlayers(...$playersData) |
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{ |
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if (count($playersData) < 2) { |
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throw new SecretSantaException('Number of players must be grater or equal than two.'); |
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} |
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try { |
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$players = []; |
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foreach ($playersData as $playerData) { |
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list($name, $email) = array_values($playerData); |
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$players[] = Player::create($name, $email); |
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} |
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$this->players->addExclusivePlayers($players); |
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} catch (PlayerException $exception) { |
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throw new SecretSantaException('One o more players are invalids.', $exception); |
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} catch (\Exception $exception) { |
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throw new SecretSantaException('An error has occurred.', $exception); |
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} |
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return $this; |
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} |
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/** |
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* @return Player[] |
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* @throws SecretSantaException |
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*/ |
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public function play() |
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{ |
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try { |
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$this->combinePlayers(); |
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return $this->associatePlayers(); |
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} catch (SecretSantaException $exception) { |
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throw $exception; |
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} catch (\Exception $exception) { |
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throw new SecretSantaException('Error during play, impossible to find secret santa, try again', $exception); |
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} |
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} |
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/** |
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* @throws SecretSantaException |
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*/ |
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private function combinePlayers() |
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{ |
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if (count($this->players) < 3) { |
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throw new SecretSantaException("Not enough players to play, at least 3 players are required"); |
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} |
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$retry = count($this->players) + $this->players->countExclusivePlayers(); |
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while (!$this->tryMatchSecretSantaPlayers() && $retry > 0 ) { |
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$retry--; |
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} |
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if (!$this->isValidCombination()) { |
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throw new SecretSantaException("Not enough players to play"); |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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private function tryMatchSecretSantaPlayers() |
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{ |
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$this->combination = []; |
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$secretPlayers = $this->players->shufflePlayers(); |
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foreach ($this->players->players() as $playerId => $player) { |
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foreach ($secretPlayers as $secretPlayer) { |
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if ($this->isValidSecretSanta($player, $secretPlayer)) { |
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$this->combination[$player->id()] = $secretPlayer->id(); |
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unset ($secretPlayers[$secretPlayer->id()]); |
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break; |
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} |
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} |
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} |
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return $this->isValidCombination(); |
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} |
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/** |
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* @param Player $player |
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* @param Player $secretPlayer |
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* @return bool |
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*/ |
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private function isValidSecretSanta(Player $player, Player $secretPlayer) |
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{ |
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if ($player->id() != $secretPlayer->id() && !$this->players->areExclusive($player, $secretPlayer)) { |
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if (!in_array($secretPlayer->id(), $this->combination)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @return bool |
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*/ |
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private function isValidCombination() |
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{ |
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return count($this->combination) > 0 && count($this->combination) == count($this->players); |
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} |
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private function associatePlayers() |
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{ |
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foreach ($this->combination as $playerId => $secretSantaId) { |
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$this->players->player($playerId)->setSecretSanta( |
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$this->players->player($secretSantaId) |
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); |
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} |
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return $this->players->players(); |
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} |
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} |
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GuilleGF /
SecretSantaPHP
