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<?php

declare(strict_types=1);

namespace NunoMaduro\Collision;

use NunoMaduro\Collision\Contracts\ArgumentFormatter as ArgumentFormatterContract;
use NunoMaduro\Collision\Contracts\Highlighter as HighlighterContract;
use NunoMaduro\Collision\Contracts\RenderlessEditor;
use NunoMaduro\Collision\Contracts\RenderlessTrace;
use NunoMaduro\Collision\Contracts\SolutionsRepository;
use NunoMaduro\Collision\Contracts\Writer as WriterContract;
use NunoMaduro\Collision\SolutionsRepositories\NullSolutionsRepository;
use Symfony\Component\Console\Output\ConsoleOutput;
use Symfony\Component\Console\Output\OutputInterface;
use Whoops\Exception\Frame;
use Whoops\Exception\Inspector;

/**
 * @internal
 *
 * @see \Tests\Unit\WriterTest
 */
final class Writer implements WriterContract
{
    /**
     * The number of frames if no verbosity is specified.
     */
    public const VERBOSITY_NORMAL_FRAMES = 1;

/**
     * Holds an instance of the solutions repository.
     *
     * @var \NunoMaduro\Collision\Contracts\SolutionsRepository
     */
    private $solutionsRepository;

/**
     * Holds an instance of the Output.
     *
     * @var \Symfony\Component\Console\Output\OutputInterface
     */
    protected $output;

/**
     * Holds an instance of the Argument Formatter.
     *
     * @var \NunoMaduro\Collision\Contracts\ArgumentFormatter
     */
    protected $argumentFormatter;

/**
     * Holds an instance of the Highlighter.
     *
     * @var \NunoMaduro\Collision\Contracts\Highlighter
     */
    protected $highlighter;

/**
     * Ignores traces where the file string matches one
     * of the provided regex expressions.
     *
     * @var string[]
     */
    protected $ignore = [];

/**
     * Declares whether or not the trace should appear.
     *
     * @var bool
     */
    protected $showTrace = true;

/**
     * Declares whether or not the title should appear.
     *
     * @var bool
     */
    protected $showTitle = true;

/**
     * Declares whether or not the editor should appear.
     *
     * @var bool
     */
    protected $showEditor = true;

/**
     * Creates an instance of the writer.
     */
    public function __construct(
        SolutionsRepository $solutionsRepository = null,
        OutputInterface $output = null,
        ArgumentFormatterContract $argumentFormatter = null,
        HighlighterContract $highlighter = null
    ) {
        $this->solutionsRepository = $solutionsRepository ?: new NullSolutionsRepository();
        $this->output              = $output ?: new ConsoleOutput();
        $this->argumentFormatter   = $argumentFormatter ?: new ArgumentFormatter();
        $this->highlighter         = $highlighter ?: new Highlighter();
    }

/**
     * {@inheritdoc}
     */
    public function write(Inspector $inspector): void
    {
        $this->renderTitleAndDescription($inspector);

$frames = $this->getFrames($inspector);

$editorFrame = array_shift($frames);

$exception = $inspector->getException();

if ($this->showEditor
            && $editorFrame !== null
            && !$exception instanceof RenderlessEditor
        ) {
            $this->renderEditor($editorFrame);
        }

$this->renderSolution($inspector);

if ($this->showTrace && !empty($frames) && !$exception instanceof RenderlessTrace) {
            $this->renderTrace($frames);
        } elseif (!$exception instanceof RenderlessEditor) {
            $this->output->writeln('');
        }
    }

/**
     * {@inheritdoc}
     */
    public function ignoreFilesIn(array $ignore): WriterContract
    {
        $this->ignore = $ignore;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function showTrace(bool $show): WriterContract
    {
        $this->showTrace = $show;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function showTitle(bool $show): WriterContract
    {
        $this->showTitle = $show;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function showEditor(bool $show): WriterContract
    {
        $this->showEditor = $show;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function setOutput(OutputInterface $output): WriterContract
    {
        $this->output = $output;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function getOutput(): OutputInterface
    {
        return $this->output;
    }

/**
     * Returns pertinent frames.
     */
    protected function getFrames(Inspector $inspector): array
    {
        return $inspector->getFrames()
            ->filter(
                function ($frame) {
                    // If we are in verbose mode, we always
                    // display the full stack trace.
                    if ($this->output->getVerbosity() >= OutputInterface::VERBOSITY_VERBOSE) {
                        return true;
                    }

foreach ($this->ignore as $ignore) {
                        // Ensure paths are linux-style (like the ones on $this->ignore)
                        // @phpstan-ignore-next-line
                        $sanitizedPath = (string) str_replace('\\', '/', $frame->getFile());
                        if (preg_match($ignore, $sanitizedPath)) {
                            return false;
                        }
                    }

return true;
                }
            )
            ->getArray();
    }

/**
     * Renders the title of the exception.
     */
    protected function renderTitleAndDescription(Inspector $inspector): WriterContract
    {
        $exception = $inspector->getException();
        $message   = rtrim($exception->getMessage());
        $class     = $inspector->getExceptionName();

if ($this->showTitle) {
            $this->render("<bg=red;options=bold> $class </>");
            $this->output->writeln('');
        }

$this->output->writeln("<fg=default;options=bold>  $message</>");

return $this;
    }

/**
     * Renders the solution of the exception, if any.
     */
    protected function renderSolution(Inspector $inspector): WriterContract
    {
        $throwable = $inspector->getException();
        $solutions = $this->solutionsRepository->getFromThrowable($throwable);

foreach ($solutions as $solution) {
            /** @var \Facade\IgnitionContracts\Solution $solution */
            $title       = $solution->getSolutionTitle();
            $description = $solution->getSolutionDescription();
            $links       = $solution->getDocumentationLinks();

$description = trim((string) preg_replace("/\n/", "\n    ", $description));

$this->render(sprintf(
                '<fg=blue;options=bold>• </><fg=default;options=bold>%s</>: %s %s',
                rtrim($title, '.'),
                $description,
                implode(', ', array_map(function (string $link) {
                    return sprintf("\n    <fg=blue>%s</>", $link);
                }, $links))
            ));
        }

return $this;
    }

/**
     * Renders the editor containing the code that was the
     * origin of the exception.
     */
    protected function renderEditor(Frame $frame): WriterContract
    {
        if ($frame->getFile() !== 'Unknown') {
            $file = $this->getFileRelativePath((string) $frame->getFile());

// getLine() might return null so cast to int to get 0 instead
            $line = (int) $frame->getLine();
            $this->render('at <fg=green>' . $file . '</>' . ':<fg=green>' . $line . '</>');

$content = $this->highlighter->highlight((string) $frame->getFileContents(), (int) $frame->getLine());

$this->output->writeln($content);
        }

return $this;
    }

/**
     * Renders the trace of the exception.
     */
    protected function renderTrace(array $frames): WriterContract
    {
        $vendorFrames = 0;
        $userFrames   = 0;
        foreach ($frames as $i => $frame) {
            if ($this->output->getVerbosity() < OutputInterface::VERBOSITY_VERBOSE && strpos($frame->getFile(), '/vendor/') !== false) {
                $vendorFrames++;
                continue;
            }

if ($userFrames > static::VERBOSITY_NORMAL_FRAMES && $this->output->getVerbosity() < OutputInterface::VERBOSITY_VERBOSE) {
                break;
            }

$userFrames++;

$file     = $this->getFileRelativePath($frame->getFile());
            $line     = $frame->getLine();
            $class    = empty($frame->getClass()) ? '' : $frame->getClass() . '::';
            $function = $frame->getFunction();
            $args     = $this->argumentFormatter->format($frame->getArgs());
            $pos      = str_pad((string) ((int) $i + 1), 4, ' ');

if ($vendorFrames > 0) {
                $this->output->write(
                    sprintf("\n      \e[2m+%s vendor frames \e[22m", $vendorFrames)
                );
                $vendorFrames = 0;
            }

$this->render("<fg=yellow>$pos</><fg=default;options=bold>$file</>:<fg=default;options=bold>$line</>");
            $this->render("<fg=white>    $class$function($args)</>", false);
        }

return $this;
    }

/**
     * Renders an message into the console.
     *
     * @return $this
     */
    protected function render(string $message, bool $break = true): WriterContract
    {
        if ($break) {
            $this->output->writeln('');
        }

$this->output->writeln("  $message");

return $this;
    }

/**
     * Returns the relative path of the given file path.
     */
    protected function getFileRelativePath(string $filePath): string
    {
        $cwd = (string) getcwd();

if (!empty($cwd)) {
            return str_replace("$cwd/", '', $filePath);
        }

return $filePath;
    }
}