<?php

declare(strict_types=1);

namespace PhpSchool\PhpWorkshop;

use Colors\Color;

use PhpSchool\CliMenu\CliMenu;

use PhpSchool\PhpWorkshop\Exception\ProblemFileDoesNotExistException;

use PhpSchool\PhpWorkshop\Output\OutputInterface;

use PhpSchool\PhpWorkshop\UserState\Serializer;

use PhpSchool\PhpWorkshop\UserState\UserState;

/**

* This class is used to render the exercise problem to the student, it also sets the current exercise

* on to the user state object.

*/

class ExerciseRenderer

{

/**

* @var string

*/

private $appName;

/**

* @var ExerciseRepository

*/

private $exerciseRepository;

/**

* @var MarkdownRenderer

*/

private $markdownRenderer;

/**

* @var Color

*/

private $color;

/**

* @var OutputInterface

*/

private $output;

/**

* @var UserState

*/

private $userState;

/**

* @var Serializer

*/

private $userStateSerializer;

/**

* @param string $appName

* @param ExerciseRepository $exerciseRepository

* @param UserState $userState

* @param Serializer $userStateSerializer

* @param MarkdownRenderer $markdownRenderer

* @param Color $color

* @param OutputInterface $output

*/

public function __construct(

string $appName,

ExerciseRepository $exerciseRepository,

UserState $userState,

Serializer $userStateSerializer,

MarkdownRenderer $markdownRenderer,

Color $color,

OutputInterface $output,

) {

$this->appName = $appName;

$this->exerciseRepository = $exerciseRepository;

$this->markdownRenderer = $markdownRenderer;

$this->color = $color;

$this->output = $output;

$this->userState = $userState;

$this->userStateSerializer = $userStateSerializer;

}

/**

* @param CliMenu $menu

*/

public function __invoke(CliMenu $menu): void

{

$item = $menu->getSelectedItem();

$exercise = $this->exerciseRepository->findByName($item->getText());

$exercises = $this->exerciseRepository->findAll();

$this->userState->setCurrentExercise($item->getText());

$this->userStateSerializer->serialize($this->userState);

$numExercises = count($exercises);

$exerciseIndex = ((int) array_search($exercise, $exercises, true)) + 1;

$output = "\n";

$output .= $this->color->__invoke(' LEARN YOU THE PHP FOR MUCH WIN! ')->magenta()->bold() . "\n";

$output .= $this->color->__invoke('*********************************')->magenta()->bold() . "\n";

$output .= "\n";

$output .= $this->color->__invoke(" " . $exercise->getName())->yellow()->bold() . "\n";

$output .= $this->color->__invoke(sprintf(" Exercise %d of %d\n\n", $exerciseIndex, $numExercises))->yellow();

$problemFile = $exercise->getProblem();

if (!is_readable($problemFile)) {

throw ProblemFileDoesNotExistException::fromFile($problemFile);

}

$content = (string) file_get_contents($problemFile);

$doc = $this->markdownRenderer->render($content);

$doc = str_replace('{appname}', $this->appName, $doc);

$output .= $doc;

$output .= "\n";

$output .= $this->helpLine('To print these instructions again, run', 'print');

$output .= $this->helpLine('To execute your program in a test environment, run', 'run program.php');

$output .= $this->helpLine('To verify your program, run', 'verify program.php');

$output .= $this->helpLine('For help run', 'help');

$output .= "\n\n";

$this->output->write($output);

}

/**

* @param string $text

* @param string $cmd

* @return string

*/

private function helpLine(string $text, string $cmd): string

{

$cmd = $this->color->__invoke(sprintf('%s %s', $this->appName, $cmd))->yellow()->__toString();

return sprintf(

" %s %s: %s\n",

$this->color->__invoke("»")->bold()->__toString(),

$text,

$cmd,

);

}

}