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<?php |
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namespace Kata\Rover; |
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final class Rover |
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{ |
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private $map; |
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private $coordinates; |
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private $direction; |
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private $obstacles_found; |
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public function __construct(Map $a_map, Coordinates $a_starting_point, Direction $a_direction) |
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{ |
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$this->map = $a_map; |
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$this->coordinates = $a_starting_point; |
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$this->direction = $a_direction; |
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$this->obstacles_found = []; |
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} |
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public function map(): Map |
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{ |
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return $this->map; |
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} |
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public function coordinates(): Coordinates |
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{ |
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return $this->coordinates; |
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} |
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public function direction(): Direction |
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{ |
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return $this->direction; |
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} |
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public function commands(array $commands): void |
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{ |
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foreach ($commands as $command) { |
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$this->process($command); |
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} |
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} |
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private function process(string $command): void |
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{ |
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if ('f' === $command) { |
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$this->coordinates = $this->moveForward(); |
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} |
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if ('b' === $command) { |
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$this->coordinates = $this->moveBackwards(); |
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} |
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if ('r' === $command) { |
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$this->direction = $this->direction->turnRight(); |
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} |
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if ('l' === $command) { |
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$this->direction = $this->direction->turnLeft(); |
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} |
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} |
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private function moveForward(): Coordinates |
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{ |
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return $this->move($this->direction); |
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} |
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private function moveBackwards(): Coordinates |
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{ |
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return $this->move($this->direction->inverseDirection()); |
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} |
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private function move(Direction $a_direction): Coordinates |
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{ |
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switch ($a_direction->direction()) { |
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case Direction::NORTH: |
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$new_coordinates = new Coordinates( |
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$this->coordinates->coordinateX(), |
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$this->coordinates->coordinateY() + 1 |
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); |
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if (!$this->map->isObstacle($new_coordinates)) { |
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return $new_coordinates; |
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} |
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$this->obstacles_found[] = $new_coordinates; |
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return $this->coordinates; |
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case Direction::SOUTH: |
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$new_coordinates = new Coordinates( |
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$this->coordinates->coordinateX(), |
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$this->coordinates->coordinateY() - 1 |
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); |
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if (!$this->map->isObstacle($new_coordinates)) { |
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return $new_coordinates; |
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} |
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$this->obstacles_found[] = $new_coordinates; |
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return $this->coordinates; |
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case Direction::EAST: |
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$new_coordinates = new Coordinates( |
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$this->coordinates->coordinateX() + 1, |
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$this->coordinates->coordinateY() |
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); |
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if (!$this->map->isObstacle($new_coordinates)) { |
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return $new_coordinates; |
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} |
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$this->obstacles_found[] = $new_coordinates; |
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return $this->coordinates; |
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case Direction::WEST: |
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$new_coordinates = new Coordinates( |
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$this->coordinates->coordinateX() - 1, |
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$this->coordinates->coordinateY() |
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); |
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if (!$this->map->isObstacle($new_coordinates)) { |
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return $new_coordinates; |
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} |
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$this->obstacles_found[] = $new_coordinates; |
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return $this->coordinates; |
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} |
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} |
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public function obstaclesFound(): array |
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{ |
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return $this->obstacles_found; |
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} |
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} |
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uvinum /
php-kata-env
