<?php
declare(strict_types = 1);

namespace Fgm\Drupal\Composer;

use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputDefinition;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Yaml\Exception\ParseException;
use Symfony\Component\Yaml\Yaml;
use Twig\Environment;
use Twig\Extension\DebugExtension;
use Twig\Loader\FilesystemLoader;
use Twig\TemplateWrapper;

class HugoConfigCommand extends BaseBuilderCommand
{

    /**
     * @var string
     */
    protected $eventName;

    /**
     * {@inheritDoc}
     */
    public function configure()
    {
        parent::configure();
        $this->eventName = $this->getName();
        $this
            ->setName('build:config_doc')
            ->setDescription('Step 2 (Optional): configure the documentation site for the current environment.')
            ->setDefinition(
                new InputDefinition([
                new InputArgument(static::ARG_FILE, InputArgument::OPTIONAL),
                ])
            )
            ->setHelp(
                <<<EOT
The build:config_doc modifies the doc/config.toml file and rebuilds the documentation
site to account for the changes.

EOT
            );
    }

    /**
   * {@inheritDoc}
   */
    public function execute(InputInterface $input, OutputInterface $output)
    {
        [$templateName, $err] = $this->validateTemplateName($input, $output);
        if ($err) {
            return 1;
        };

        $settingsPath = $this->getSettingsPath();
        $templatePath = "${settingsPath}/${templateName}";
        $realTemplatePath = realpath($templatePath);
        if (empty($realTemplatePath)) {
          $output->writeln(sprintf("Could not load template %s: no such file", $templateName));
          return 2;
        }

        $paramsPath = "${settingsPath}/merged.params.local.yml";
        $realParamsPath = realpath($paramsPath);
        if (empty($realParamsPath)) {
            $output->writeln(sprintf("Could not load parameters %s: no such file", $paramsPath));
            return 3;
        }
        $yaml = new Yaml();

        try {
            $params = $yaml->parseFile($realParamsPath);
        } catch (ParseException $e) {
            $output->writeln(sprintf("Could not parse %s: %s", $realParamsPath, $e->getMessage()));
            return 4;
        }

        $loader = new FilesystemLoader($settingsPath, $settingsPath);
        $twig = new Environment($loader, [
            'auto_reload' => true,
            'cache' => false,
            'debug' => true,
            'strict_variables' => true,
        ]);
        $twig->addExtension(new DebugExtension());

        $wrapper = $twig->load($templateName);
        $context = [
          'base_url' => $params['instance']['doc']['base_url'],
        ];
        $error = $this->render($wrapper, $context, $output);
        if ($error) {
          $output->writeln(sprintf("Failed rendering doc configuration"));
          return 5;
        }

        $cwd = getcwd();
        chdir('doc');
        $err = system("hugo -D", $exit);
        if ($exit != 0) {
          $output->writeln(sprintf("Failed running hugo to rebuild documentation site: %s\n", $err));
          return 6;
        }
        chdir($cwd);
    }

  protected function render(TemplateWrapper $wrapper, array $context, OutputInterface $output): int
    {
        $configPath = "doc/config.toml";
        if (file_exists($configPath)) {
          $ok = unlink($configPath);
          if (!$ok) {
            $output->writeln(sprintf(
              "Could not remove old %s file",
              $configPath
            ));
            return 1;
          }
        }

        $rendered = $wrapper->render($context);
        $ok = file_put_contents($configPath, $rendered, LOCK_EX);
        if (!$ok) {
          $output->writeln(sprintf('Could not write new %s file', $configPath));
          return 2;
        }

        return 0;
    }

}