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<?php declare(strict_types=1); |
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namespace Smr; |
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use Exception; |
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/** |
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* Class used to keep track of paths between two sectors. |
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* Used by the Plotter class to store the state of a plotted course. |
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*/ |
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class Path { |
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/** @var array<int, int> */ |
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private array $path; |
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private int $numWarps = 0; |
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/** @var array<int, int> */ |
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private array $warpMap = []; |
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public function __construct(int $startSectorID) { |
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$this->path = [$startSectorID]; |
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} |
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/** |
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* Returns the number of sectors to get to the end of the path |
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* (does not include the start sector). |
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*/ |
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public function getLength(): int { |
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return count($this->path) - 1; |
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} |
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public function getNumWarps(): int { |
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return $this->numWarps; |
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} |
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public function getTurns(): int { |
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return $this->getLength() * TURNS_PER_SECTOR + $this->numWarps * (TURNS_PER_WARP - TURNS_PER_SECTOR); |
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} |
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public function getDistance(): int { |
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return $this->getLength() + $this->numWarps * (TURNS_WARP_SECTOR_EQUIVALENCE - 1); |
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} |
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public function getEndSectorID(): int { |
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return $this->path[count($this->path) - 1]; |
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} |
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/** |
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* @return array<int, int> |
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*/ |
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public function getPath(): array { |
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return $this->path; |
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} |
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// NOTE: this assumes 2-way warps |
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public function reversePath(): void { |
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$this->path = array_reverse($this->path); |
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$this->warpMap = array_flip($this->warpMap); |
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} |
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/** |
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* Add a neighboring sector to the path. |
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*/ |
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public function addLink(int $nextSector): void { |
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$this->path[] = $nextSector; |
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} |
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/** |
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* Add a warp to the path. |
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*/ |
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public function addWarp(int $nextSector): void { |
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$this->warpMap[$this->getEndSectorID()] = $nextSector; |
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$this->numWarps++; |
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$this->path[] = $nextSector; |
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} |
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public function getNextOnPath(): int { |
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return $this->path[1]; |
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} |
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public function getStartSectorID(): int { |
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return $this->path[0]; |
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} |
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public function followPath(): void { |
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$nextSectorID = $this->getNextOnPath(); |
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if (in_array($nextSectorID, $this->warpMap)) { |
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$this->numWarps--; |
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} |
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array_shift($this->path); |
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} |
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public function isInPath(int $sectorID): bool { |
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return in_array($sectorID, $this->getPath()); |
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} |
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/** |
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* If the given sector is in the path, then return the segment |
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* of the path that comes after the given sector. |
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*/ |
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public function skipToSector(int $sectorID): self { |
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$position = array_search($sectorID, $this->path); |
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if ($position === false) { |
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throw new Exception('Cannot skip to sector not in path!'); |
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} |
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// The resulting path does include sectorID, i.e. [sectorID,end] |
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$this->path = array_slice($this->path, $position); |
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$this->numWarps = count(array_intersect($this->path, array_keys($this->warpMap))); |
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return $this; |
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} |
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} |
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smrealms /
smr
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