SecretSanta\SecretSanta

Complexity

Total Complexity

28

Size/Duplication

Total Lines	167
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	3

Test Coverage

Coverage

18.57%

Importance

Changes	1
Bugs	0	Features	0

10 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	4	1
A	addPlayer()	0	6	1
A	addCouple()	0	9	1
B	addExclusivePlayers()	0	22	5
A	play()	0	12	3
B	combinePlayers()	0	16	5
A	tryMatchSecretSantaPlayers()	0	16	4
A	isValidSecretSanta()	0	10	4
A	isValidCombination()	0	4	2
A	associatePlayers()	0	10	2

<?php

namespace SecretSanta;

use SecretSanta\Exceptions\PlayerException;
use SecretSanta\Exceptions\SecretSantaException;

/**
 * Class SecretSanta
 * @package SecretSanta
 */
class SecretSanta
{
    /** @var PlayersCollection */
    private $players;
    /** @var  array */
    private $combination;

    /**
     * SecretSanta constructor.
     */
    public function __construct()
    {
        $this->players = new PlayersCollection();
    }

    /**
     * Add single player to the game
     * @param string $name
     * @param string $email
     * @return SecretSanta
     */
    public function addPlayer(string $name, string $email)
    {
        $this->players->addPlayer(Player::create($name, $email));

        return $this;
    }

    /**
     * Add two excluded players to the game
     * @param string $name
     * @param string $email
     * @param string $coupleName
     * @param string $coupleEmail
     * @return SecretSanta
     */
    public function addCouple(string $name, string $email, string $coupleName, string $coupleEmail)
    {
        $this->players->addCouple(
            Player::create($name, $email),
            Player::create($coupleName, $coupleEmail)
        );

        return $this;
    }

    /**
     * Add multiple exclusive players to the game
     * @param array $playersData
     * @return $this
     * @throws SecretSantaException
     */
    public function addExclusivePlayers(...$playersData)
    {
        if (count($playersData) < 2) {
            throw new SecretSantaException('Number of players must be grater or equal than two.');
        }

        try {
            $players = [];
            foreach ($playersData as $playerData) {
                list($name, $email) = array_values($playerData);
                $players[] = Player::create($name, $email);
            }

            $this->players->addExclusivePlayers($players);
        } catch (PlayerException $exception) {
            throw new SecretSantaException('One o more players are invalids.', $exception);
        } catch (\Exception $exception) {
            throw new SecretSantaException('An error has occurred.', $exception);
        }

        return $this;
    }

    /**
     * @return Player[]
     * @throws SecretSantaException
     */
    public function play()
    {
        try {
            $this->combinePlayers();

            return $this->associatePlayers();
        } catch (SecretSantaException $exception) {
            throw  $exception;
        } catch (\Exception $exception) {
            throw new SecretSantaException('Error during play, impossible to find secret santa, try again', $exception);
        }
    }

    /**
     * @throws SecretSantaException
     */
    private function combinePlayers()
    {
        if (count($this->players) < 4) {
            throw new SecretSantaException("Not enough players to play, at least 4 players are required");
        }

        $retry = count($this->players) + $this->players->countExclusivePlayers();

        while (!$this->tryMatchSecretSantaPlayers() && $retry > 0 ) {
            $retry--;
        }

        if (!$this->isValidCombination()) {
            throw new SecretSantaException("Not enough players to play");
        }
    }

    /**
     * @return bool
     */
    private function tryMatchSecretSantaPlayers()
    {
        $this->combination = [];
        $secretPlayers = $this->players->shufflePlayers();
        foreach ($this->players->players() as $playerId => $player) {
            foreach ($secretPlayers as $secretPlayer) {
                if ($this->isValidSecretSanta($player, $secretPlayer)) {
                    $this->combination[$player->id()] = $secretPlayer->id();
                    unset ($secretPlayers[$secretPlayer->id()]);
                    break;
                }
            }
        }

        return $this->isValidCombination();
    }

    /**
     * @param Player $player
     * @param Player $secretPlayer
     * @return bool
     */
    private function isValidSecretSanta(Player $player, Player $secretPlayer)
    {
        if ($player->id() != $secretPlayer->id() && !$this->players->areExclusive($player, $secretPlayer)) {
            if (!in_array($secretPlayer->id(), $this->combination)) {
                return true;
            }
        }

        return false;
    }

    /**
     * @return bool
     */
    private function isValidCombination()
    {
        return count($this->combination) > 0 && count($this->combination) == count($this->players);
    }

    private function associatePlayers()
    {
        foreach ($this->combination as $playerId => $secretSantaId) {
            $this->players->player($playerId)->setSecretSanta(
                $this->players->player($secretSantaId)
            );
        }

        return $this->players->players();
    }
}