class CompleteCommand

final class CompleteCommand extends Command {
    public const COMPLETION_API_VERSION = '1';
    private array $completionOutputs;
    private bool $isDebug = false;
    
    /**
     * @param array<string, class-string<CompletionOutputInterface>> $completionOutputs A list of additional completion outputs, with shell name as key and FQCN as value
     */
    public function __construct(array $completionOutputs = []) {
        // must be set before the parent constructor, as the property value is used in configure()
        $this->completionOutputs = $completionOutputs + [
            'bash' => BashCompletionOutput::class,
            'fish' => FishCompletionOutput::class,
            'zsh' => ZshCompletionOutput::class,
        ];
        parent::__construct();
    }
    protected function configure() : void {
        $this->addOption('shell', 's', InputOption::VALUE_REQUIRED, 'The shell type ("' . implode('", "', array_keys($this->completionOutputs)) . '")')
            ->addOption('input', 'i', InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY, 'An array of input tokens (e.g. COMP_WORDS or argv)')
            ->addOption('current', 'c', InputOption::VALUE_REQUIRED, 'The index of the "input" array that the cursor is in (e.g. COMP_CWORD)')
            ->addOption('api-version', 'a', InputOption::VALUE_REQUIRED, 'The API version of the completion script')
            ->addOption('symfony', 'S', InputOption::VALUE_REQUIRED, 'deprecated');
    }
    protected function initialize(InputInterface $input, OutputInterface $output) : void {
        $this->isDebug = filter_var(getenv('SYMFONY_COMPLETION_DEBUG'), \FILTER_VALIDATE_BOOL);
    }
    protected function execute(InputInterface $input, OutputInterface $output) : int {
        try {
            // "symfony" must be kept for compat with the shell scripts generated by Symfony Console 5.4 - 6.1
            $version = $input->getOption('symfony') ? '1' : $input->getOption('api-version');
            if ($version && version_compare($version, self::COMPLETION_API_VERSION, '<')) {
                $message = \sprintf('Completion script version is not supported ("%s" given, ">=%s" required).', $version, self::COMPLETION_API_VERSION);
                $this->log($message);
                $output->writeln($message . ' Install the Symfony completion script again by using the "completion" command.');
                return 126;
            }
            $shell = $input->getOption('shell');
            if (!$shell) {
                throw new \RuntimeException('The "--shell" option must be set.');
            }
            if (!($completionOutput = $this->completionOutputs[$shell] ?? false)) {
                throw new \RuntimeException(\sprintf('Shell completion is not supported for your shell: "%s" (supported: "%s").', $shell, implode('", "', array_keys($this->completionOutputs))));
            }
            $completionInput = $this->createCompletionInput($input);
            $suggestions = new CompletionSuggestions();
            $this->log([
                '',
                '<comment>' . date('Y-m-d H:i:s') . '</>',
                '<info>Input:</> <comment>("|" indicates the cursor position)</>',
                '  ' . $completionInput,
                '<info>Command:</>',
                '  ' . implode(' ', $_SERVER['argv']),
                '<info>Messages:</>',
            ]);
            $command = $this->findCommand($completionInput);
            if (null === $command) {
                $this->log('  No command found, completing using the Application class.');
                $this->getApplication()
                    ->complete($completionInput, $suggestions);
            }
            elseif ($completionInput->mustSuggestArgumentValuesFor('command') && $command->getName() !== $completionInput->getCompletionValue() && !\in_array($completionInput->getCompletionValue(), $command->getAliases(), true)) {
                $this->log('  No command found, completing using the Application class.');
                // expand shortcut names ("cache:cl<TAB>") into their full name ("cache:clear")
                $suggestions->suggestValues(array_filter(array_merge([
                    $command->getName(),
                ], $command->getAliases())));
            }
            else {
                $command->mergeApplicationDefinition();
                $completionInput->bind($command->getDefinition());
                if (CompletionInput::TYPE_OPTION_NAME === $completionInput->getCompletionType()) {
                    $this->log('  Completing option names for the <comment>' . ($command instanceof LazyCommand ? $command->getCommand() : $command)::class . '</> command.');
                    $suggestions->suggestOptions($command->getDefinition()
                        ->getOptions());
                }
                else {
                    $this->log([
                        '  Completing using the <comment>' . ($command instanceof LazyCommand ? $command->getCommand() : $command)::class . '</> class.',
                        '  Completing <comment>' . $completionInput->getCompletionType() . '</> for <comment>' . $completionInput->getCompletionName() . '</>',
                    ]);
                    if (null !== ($compval = $completionInput->getCompletionValue())) {
                        $this->log('  Current value: <comment>' . $compval . '</>');
                    }
                    $command->complete($completionInput, $suggestions);
                }
            }
            
            /** @var CompletionOutputInterface $completionOutput */
            $completionOutput = new $completionOutput();
            $this->log('<info>Suggestions:</>');
            if ($options = $suggestions->getOptionSuggestions()) {
                $this->log('  --' . implode(' --', array_map(fn($o) => $o->getName(), $options)));
            }
            elseif ($values = $suggestions->getValueSuggestions()) {
                $this->log('  ' . implode(' ', $values));
            }
            else {
                $this->log('  <comment>No suggestions were provided</>');
            }
            $completionOutput->write($suggestions, $output);
        } catch (\Throwable $e) {
            $this->log([
                '<error>Error!</error>',
                (string) $e,
            ]);
            if ($output->isDebug()) {
                throw $e;
            }
            return 2;
        }
        return 0;
    }
    private function createCompletionInput(InputInterface $input) : CompletionInput {
        $currentIndex = $input->getOption('current');
        if (!$currentIndex || !ctype_digit($currentIndex)) {
            throw new \RuntimeException('The "--current" option must be set and it must be an integer.');
        }
        $completionInput = CompletionInput::fromTokens($input->getOption('input'), (int) $currentIndex);
        try {
            $completionInput->bind($this->getApplication()
                ->getDefinition());
        } catch (ExceptionInterface) {
        }
        return $completionInput;
    }
    private function findCommand(CompletionInput $completionInput) : ?Command {
        try {
            $inputName = $completionInput->getFirstArgument();
            if (null === $inputName) {
                return null;
            }
            return $this->getApplication()
                ->find($inputName);
        } catch (CommandNotFoundException) {
        }
        return null;
    }
    private function log($messages) : void {
        if (!$this->isDebug) {
            return;
        }
        $commandName = basename($_SERVER['argv'][0]);
        file_put_contents(sys_get_temp_dir() . '/sf_' . $commandName . '.log', implode(\PHP_EOL, (array) $messages) . \PHP_EOL, \FILE_APPEND);
    }

}