/**
* Returns the total brightness of all lights in a {@link LightGrid}
* @param LightGrid $grid
* @return int total brightness
*/
public static function totalBrightness(LightGrid $grid)
{
$sum = 0;
foreach ($grid->getGrid() as $row) {
$sum += array_sum($row);
}
return $sum;
}
/**
* Runs a single {@link LightInstruction} on a {@link LightGrid} applying the
* {@link LightInstructionActionBehavior} rules on each light.
*
* @param LightGrid $lightGrid
* @param LightInstruction $instruction
* @param LightInstructionActionBehavior $actionBehavior
*/
public static function run(LightGrid $lightGrid, LightInstruction $instruction, LightInstructionActionBehavior $actionBehavior)
{
$grid = $lightGrid->getGrid();
$action = $instruction->getAction();
$coordinates = $instruction->getCoordinatePair();
$start = $coordinates[0];
$end = $coordinates[1];
$minY = min($start->getY(), $end->getY());
$yRange = abs($end->getY() - $start->getY()) + 1;
for ($x = min($start->getX(), $end->getX()); $x <= max($start->getX(), $end->getX()); $x++) {
$lights = array_slice($grid[$x], $minY, $yRange);
$lights = array_map($actionBehavior->behaviorForAction($action), $lights);
array_splice($grid[$x], $minY, $yRange, $lights);
}
$lightGrid->setGrid($grid);
}
$command = LightSwitchCommand::COMMAND_TOGGLE;
break;
case 'turn on':
$command = LightSwitchCommand::COMMAND_ON;
break;
case 'turn off':
default:
$command = LightSwitchCommand::COMMAND_OFF;
}
return new LightSwitchCommand(Coordinate::fromString($matches[2]), Coordinate::fromString($matches[3]), $command);
}
}
$parser = new CommandParser();
$lightGrid = new LightGrid(new OnOffLightStrategy());
foreach (file('6.txt') as $instruction) {
echo 'excecuting ' . $instruction . PHP_EOL;
$lightGrid->toggleLights($parser->parseCommand($instruction));
}
echo 'Part 1 answer: ' . $lightGrid->getNumLights(true);
$lightGrid = new LightGrid(new BrightnessLightStrategy());
foreach (file('6.txt') as $instruction) {
echo 'excecuting ' . $instruction . PHP_EOL;
$lightGrid->toggleLights($parser->parseCommand($instruction));
}
$totalBrightness = 0;
foreach ($lightGrid->getLights() as $x => $arr) {
foreach ($arr as $y => $brightness) {
$totalBrightness += $brightness;
}
}
echo 'Part 2 answer: ' . $totalBrightness;
