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<?php |
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namespace App; |
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/** |
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* Class for working with Trips. |
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*/ |
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class TripSorter |
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{ |
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/** @var BoardingCard[] */ |
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private $cards; |
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/** |
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* TripSorter constructor. |
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* |
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* @param BoardingCard[] $cards |
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*/ |
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public function __construct(array $cards = []) |
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{ |
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$this->setCards($cards); |
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} |
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/** |
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* @return array |
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*/ |
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public function getCards() |
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{ |
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$cards = []; |
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foreach ($this->cards as $card) { |
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$cards[] = $card->toArray(); |
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} |
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return $cards; |
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} |
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/** |
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* @param BoardingCard[] $cards |
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* |
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* @return TripSorter |
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*/ |
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public function setCards(array $cards = []) |
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{ |
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$this->cards = []; |
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foreach ($cards as $card) { |
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$this->cards[] = new BoardingCard($card); |
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} |
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return $this; |
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} |
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/** |
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* Sort an array of trip cards. |
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* |
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* Example: |
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* $cards = [ |
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* ['from' => 'Madrid', 'to' => 'Barcelona', 'type' => 'train', 'number' => '78A', 'info' => 'Sit in seat 45B.'], |
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* ['from' => 'Barcelona', 'to' => 'Gerona Airport', 'type' => 'airport bus', 'number' => '', 'info' => 'No seat assignment.'], |
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* ['from' => 'Gerona Airport', 'to' => 'Stockholm', 'type' => 'flight', 'number' => 'SK455', 'seat' => '3A', 'info' => 'Gate 45B, seat 3A. Baggage drop at ticket counter 344.'], |
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* ['from' => 'Stockholm', 'to' => 'New York JFK', 'type' => 'flight', 'number' => 'SK455', 'seat' => '7B', 'info' => 'Gate 22. Baggage will we automatically transferred from your last leg.'], |
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* ]; |
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* $result = TripSorter::sort($cards); |
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* |
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* returns |
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* [ |
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* 'Take train 78A from Madrid to Barcelona. Sit in seat 45B.', |
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* 'Take airport bus from Barcelona to Gerona Airport. No seat assignment.', |
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* 'From Gerona Airport, take flight SK455 to Stockholm. Gate 45B, seat 3A. Baggage drop at ticket counter 344.', |
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* 'From Stockholm, take flight SK455 to New York JFK. Gate 22. Baggage will we automatically transferred from your last leg.', |
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* 'You have arrived at your final destination.', |
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* ]; |
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* |
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* @param array $cards |
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* |
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* @static |
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* @return array |
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*/ |
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public static function sort(array $cards = []) |
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{ |
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$instance = new self($cards); |
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$instance->sortCards(); |
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$result = $instance->output(); |
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return $result; |
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} |
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/** |
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* Sorts the boarding cards. |
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*/ |
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public function sortCards() |
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{ |
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$count = 0; |
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$fromCity = []; |
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$toCity = []; |
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foreach ($this->cards as $card) { |
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$toCity[$card->getTo()] = $count; |
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$fromCity[$card->getFrom()] = $count++; |
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} |
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if (empty($fromCity)) { |
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return $this; |
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} |
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$diff = array_keys(array_diff_key($fromCity, $toCity)); |
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if (count($diff) !== 1) { |
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throw new \RuntimeException('There should be one starting point'); |
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} |
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$city = $diff[0]; |
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$sorted = []; |
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while (isset($fromCity[$city])) { |
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$index = $fromCity[$city]; |
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$sorted[] = $this->cards[$index]; |
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$city = $this->cards[$index]->getTo(); // Barcelona |
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} |
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$this->cards = $sorted; |
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return $this; |
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} |
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/** |
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* Formats the output. |
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* |
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* @return array |
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*/ |
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public function output() |
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{ |
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$output = []; |
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foreach ($this->cards as $card) { |
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if ($card->getType() === 'flight') { |
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$output[] = 'From ' . $card->getFrom() |
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. ', take ' . $card->getType() |
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. ' ' . $card->getNumber() |
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. ' to ' . $card->getTo() |
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. '. ' . $card->getInfo(); |
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} else { |
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$output[] = 'Take ' . $card->getType() |
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. ' ' . $card->getNumber() |
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. ' from ' . $card->getFrom() |
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. ' to ' . $card->getTo() |
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. '. ' . $card->getInfo(); |
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} |
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} |
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$output[] = 'You have arrived at your final destination.'; |
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return $output; |
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} |
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} |
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sasakocic /
trip-sorter
