<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Dotenv\Command;

use Symfony\Component\Console\Attribute\AsCommand;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Completion\CompletionInput;
use Symfony\Component\Console\Completion\CompletionSuggestions;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\SymfonyStyle;
use Symfony\Component\Dotenv\Dotenv;

/**
 * A console command to debug current dotenv files with variables and values.
 *
 * @author Christopher Hertel <mail@christopher-hertel.de>
 */
#[AsCommand(name: 'debug:dotenv', description: 'List all dotenv files with variables and values')]
final class DebugCommand extends Command
{
    private string $kernelEnvironment;
    private string $projectDirectory;

    public function __construct(string $kernelEnvironment, string $projectDirectory)
    {
        $this->kernelEnvironment = $kernelEnvironment;
        $this->projectDirectory = $projectDirectory;

        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->setDefinition([
                new InputArgument('filter', InputArgument::OPTIONAL, 'The name of an environment variable or a filter.', null, $this->getAvailableVars(...)),
            ])
            ->setHelp(<<<'EOT'
The <info>%command.full_name%</info> command displays all the environment variables configured by dotenv:

  <info>php %command.full_name%</info>

To get specific variables, specify its full or partial name:

    <info>php %command.full_name% FOO_BAR</info>

EOT
            );
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $io->title('Dotenv Variables & Files');

        if (!\array_key_exists('SYMFONY_DOTENV_VARS', $_SERVER)) {
            $io->error('Dotenv component is not initialized.');

            return 1;
        }

        $envFiles = $this->getEnvFiles();
        $availableFiles = array_filter($envFiles, fn (string $file) => is_file($this->getFilePath($file)));

        if (\in_array('.env.local.php', $availableFiles, true)) {
            $io->warning('Due to existing dump file (.env.local.php) all other dotenv files are skipped.');
        }

        if (is_file($this->getFilePath('.env')) && is_file($this->getFilePath('.env.dist'))) {
            $io->warning('The file .env.dist gets skipped due to the existence of .env.');
        }

        $io->section('Scanned Files (in descending priority)');
        $io->listing(array_map(static fn (string $envFile) => \in_array($envFile, $availableFiles, true)
            ? sprintf('<fg=green>✓</> %s', $envFile)
            : sprintf('<fg=red>⨯</> %s', $envFile), $envFiles));

        $nameFilter = $input->getArgument('filter');
        $variables = $this->getVariables($availableFiles, $nameFilter);

        $io->section('Variables');

        if ($variables || null === $nameFilter) {
            $io->table(
                array_merge(['Variable', 'Value'], $availableFiles),
                $this->getVariables($availableFiles, $nameFilter)
            );

            $io->comment('Note that values might be different between web and CLI.');
        } else {
            $io->warning(sprintf('No variables match the given filter "%s".', $nameFilter));
        }

        return 0;
    }

    public function complete(CompletionInput $input, CompletionSuggestions $suggestions): void
    {
        if ($input->mustSuggestArgumentValuesFor('filter')) {
            $suggestions->suggestValues($this->getAvailableVars());
        }
    }

    private function getVariables(array $envFiles, ?string $nameFilter): array
    {
        $vars = $this->getAvailableVars();

        $output = [];
        $fileValues = [];
        foreach ($vars as $var) {
            if (null !== $nameFilter && 0 !== stripos($var, $nameFilter)) {
                continue;
            }

            $realValue = $_SERVER[$var];
            $varDetails = [$var, $realValue];
            foreach ($envFiles as $envFile) {
                $values = $fileValues[$envFile] ??= $this->loadValues($envFile);

                $varString = $values[$var] ?? '<fg=yellow>n/a</>';
                $shortenedVar = $this->getHelper('formatter')->truncate($varString, 30);
                $varDetails[] = $varString === $realValue ? '<fg=green>'.$shortenedVar.'</>' : $shortenedVar;
            }

            $output[] = $varDetails;
        }

        return $output;
    }

    private function getAvailableVars(): array
    {
        $vars = explode(',', $_SERVER['SYMFONY_DOTENV_VARS'] ?? '');
        sort($vars);

        return $vars;
    }

    private function getEnvFiles(): array
    {
        $files = [
            '.env.local.php',
            sprintf('.env.%s.local', $this->kernelEnvironment),
            sprintf('.env.%s', $this->kernelEnvironment),
        ];

        if ('test' !== $this->kernelEnvironment) {
            $files[] = '.env.local';
        }

        if (!is_file($this->getFilePath('.env')) && is_file($this->getFilePath('.env.dist'))) {
            $files[] = '.env.dist';
        } else {
            $files[] = '.env';
        }

        return $files;
    }

    private function getFilePath(string $file): string
    {
        return $this->projectDirectory.\DIRECTORY_SEPARATOR.$file;
    }

    private function loadValues(string $file): array
    {
        $filePath = $this->getFilePath($file);

        if (str_ends_with($filePath, '.php')) {
            return include $filePath;
        }

        return (new Dotenv())->parse(file_get_contents($filePath));
    }
}
