<?php

namespace LakeDrops\Docker4Drupal;

use Composer\Package\PackageInterface;
use Composer\Composer;
use Composer\IO\IOInterface;
use Composer\Script\Event as ScriptEvent;
use LakeDrops\Component\Dotenv\Dotenv;
use LakeDrops\DockerTraefik\Traefik;
use Symfony\Component\Filesystem\Filesystem;
use Symfony\Component\Yaml\Yaml;

class Handler {

  /**
   * @var \Composer\Composer
   */
  protected $composer;

  /**
   * @var \Composer\IO\IOInterface
   */
  protected $io;

  /**
   * @var PackageInterface
   */
  protected $drupalCorePackage;

  /**
   * Handler constructor.
   *
   * @param Composer $composer
   * @param IOInterface $io
   */
  public function __construct(Composer $composer, IOInterface $io) {
    $this->composer = $composer;
    $this->io = $io;
  }

  /**
   * Look up the Drupal core package object, or return it from where we cached
   * it in the $drupalCorePackage field.
   *
   * @return PackageInterface
   */
  protected function getDrupalCorePackage() {
    if (!isset($this->drupalCorePackage)) {
      $this->drupalCorePackage = $this->getPackage('drupal/core');
    }
    return $this->drupalCorePackage;
  }

  /**
   * Retrieve a package from the current composer process.
   *
   * @param string $name
   *   Name of the package to get from the current composer installation.
   *
   * @return PackageInterface
   */
  protected function getPackage($name) {
    return $this->composer->getRepositoryManager()->getLocalRepository()->findPackage($name, '*');
  }

  /**
   * Configure Drupal Project for Docker.
   *
   * @param ScriptEvent $event
   * @param bool $overwrite
   */
  public function configureProject($event, $overwrite = FALSE) {

    // We only do the fancy stuff for developers
    if (!$event->isDevMode()) {
      return;
    }

    $options = $this->getOptions();
    $fs = new Filesystem();
    $installationManager = $this->composer->getInstallationManager();

    if (isset($options['webroot'])) {
      if (!$fs->exists($options['webroot'])) {
        return;
      }
      $webRoot = $options['webroot'];
    }
    else {
      $drupalCorePackage = $this->getDrupalCorePackage();
      if (!$drupalCorePackage) {
        // We are called too early, Drupal core is not available yet.
        return;
      }
      $corePath = $installationManager->getInstallPath($drupalCorePackage);
      // Directory where Drupal's index.php is located
      $webRoot = dirname($corePath);
    }

    // Directory where the root project is being created
    $projectRoot = getcwd();
    // Directory where this plugin is being installed
    $pluginRoot = $installationManager->getInstallPath($this->getPackage('lakedrops/docker4drupal'));

    // If the d8-project-scaffold plugin is present we only execute this one
    // if $force is TRUE. This way we can make sure that we get executed after
    // d8-project-scaffold.
    $settingsPath = $webRoot . '/sites/default';
    if ($this->getPackage('lakedrops/d8-project-scaffold')) {
      if (!$fs->exists($projectRoot . '/settings/default')) {
        return;
      }
      $settingsPath = 'settings/default';
    }

    // Provide all the required files
    $twig_loader = new \Twig_Loader_Array([]);
    $twig = new \Twig_Environment($twig_loader);
    $options['webRoot'] = $webRoot . '/';
    $orig_ignored = FALSE;
    foreach ($this->getFiles($projectRoot, $webRoot, $settingsPath) as $template => $def) {
      $file = $def['dest'] . '/' . $template;
      if ($overwrite || !$fs->exists($file)) {
        $twig_loader->setTemplate($template, file_get_contents($pluginRoot . '/templates/' . $template . '.twig'));
        $rendered = $twig->render($template, $options);
        if (!empty($def['add2yaml']) && isset($options[$template])) {
          $yaml = Yaml::parse($rendered);
          $yaml  = array_merge_recursive($yaml, $options[$template]);
          $rendered = Yaml::dump($yaml, 9, 2);
        }
        if ($fs->exists($file)) {
          if (md5_file($file) == md5($rendered)) {
            continue;
          }
          $orig_file = $file . '.orig';
          if ($fs->exists($orig_file)) {
            $fs->remove($orig_file);
          }
          $fs->rename($file, $orig_file);
          if (!$orig_ignored) {
            $this->git('ignore *.orig');
            $orig_ignored = TRUE;
          }
        }
        else {
          $this->git('ignore ' . $template);
        }
        file_put_contents($file, $rendered);
      }
      if (isset($def['link']) && ($def['link'] != $settingsPath)) {
        $link = $def['link'] . '/' . $template;
        if (!$fs->exists($link)) {
          $rel = substr($fs->makePathRelative($file, $projectRoot . '/' . $link), 3, -1);
          $fs->symlink($rel, $link);
        }
      }
      $fs->chmod($file, 0664);
    }

    // Make sure that settings.docker.php gets called from settings.php
    $settingsPhpFile = $settingsPath . '/settings.php';
    if ($fs->exists(($settingsPhpFile))) {
      $settingsPhp = file_get_contents($settingsPhpFile);
      if (strpos($settingsPhp, 'settings.docker.php') === FALSE) {
        $settingsPhp .= "\n\nif (file_exists(__DIR__ . '/settings.docker.php')) {\n  include __DIR__ . '/settings.docker.php';\n}\n";
        file_put_contents($settingsPhpFile, $settingsPhp);
      }
    }

    $traefik = new Traefik($options['projectname']);
    $traefik->update();
  }

  protected function getFiles($projectRoot, $webRoot, $settingsPath) {
    return [
      'settings.docker.php' => [
        'dest' => $projectRoot . '/' . $settingsPath,
        'link' => $webRoot . '/sites/default',
      ],
      'docker-compose.yml' => [
        'dest' => $projectRoot,
        'add2yaml' => TRUE,
      ],
      'aliases.drushrc.php' => [
        'dest' => $projectRoot . '/drush',
      ],
      'drushrc.php' => [
        'dest' => $projectRoot . '/drush',
      ],
      'aliases.yml' => [
        'dest' => $projectRoot . '/drush',
        'add2yaml' => TRUE,
      ],
      'drush.yml' => [
        'dest' => $projectRoot . '/drush',
        'add2yaml' => TRUE,
      ],
    ];
  }

  /**
   * Retrieve excludes from optional "extra" configuration.
   *
   * @return array
   */
  protected function getOptions() {
    $projectname = str_replace([' ', '-', '_', '.'], '', basename(getcwd()));
    $env = new Dotenv('docker4drupal', $this->io);
    $env->put('COMPOSE_PROJECT_NAME', $projectname);
    $extra = $this->composer->getPackage()->getExtra() + ['docker4drupal' => []];
    $options = NestedArray::mergeDeep([
      'projectname' => $projectname,
      'docker0' => [
        'ip' => $this->getLocalIpv4('docker0'),
      ],
      'live' => [
        'root' => '',
        'uri' => '',
        'host' => '',
        'user' => $env->receive('live_host_username', 'Remote username for host of the live site', getenv('USER')),
      ],
      'drupal' => [
        'version' => '8',
      ],
      'php' => [
        'version' => '7.0',
        'xdebug' => 1,
      ],
      'webserver' => [
        'type' => 'nginx',
        'version' => '1.13',
      ],
      'varnish' => [
        'enable' => 0,
      ],
      'redis' => [
        'version' => '4.0',
      ],
      'adminer' => [
        'version' => '4.3',
      ],
      'solr' => [
        'enable' => 0,
        'version' => '6.6',
      ],
      'node' => [
        'enable' => 0,
        'key' => '',
        'path' => '',
      ],
      'memcached' => [
        'enable' => 0,
      ],
      'rsyslog' => [
        'enable' => 0,
      ],
      'athenapdf' => [
        'enable' => 0,
        'key' => '',
      ],
      'blackfire' => [
        'enable' => 0,
        'id' => '',
        'token' => '',
      ],
      'webgrind' => [
        'enable' => 0,
      ],
    ], $extra['docker4drupal']);
    return $options;
  }

  /**
   * Wrapper for git command in the root directory.
   *
   * @param $command
   *   Git command name, arguments and/or options.
   */
  protected function git($command) {
    passthru(escapeshellcmd('git -c "user.email=d8-project@lakedrops.com" ' . $command));
  }

  private function getLocalIpv4($interface = NULL) {
    $out = explode(PHP_EOL, shell_exec('LC_ALL=C /sbin/ifconfig'));
    $local_addrs = array();
    $ifname = 'unknown';
    foreach ($out as $str) {
      $matches = array();
      if (preg_match('/^([a-z0-9]+)(:\d{1,2})?(\s)+Link/', $str, $matches)) {
        $ifname = $matches[1];
        if(strlen($matches[2])>0) {
          $ifname .= $matches[2];
        }
      } elseif (preg_match('/inet addr:((?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)(?:[.](?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)){3})\s/', $str, $matches)) {
        $local_addrs[$ifname] = $matches[1];
      }
    }

    if (!isset($interface)) {
      return $local_addrs;
    }
    return isset($local_addrs[$interface]) ? $local_addrs[$interface] : '127.0.0.1';
  }

}