<?php

/**
 * @file
 * Contains \LakeDrops\Docker4Drupal\Handler.
 */

namespace LakeDrops\Docker4Drupal;

use Composer\Package\PackageInterface;
use Composer\Composer;
use Composer\IO\IOInterface;
use Composer\Script\Event as ScriptEvent;
use Symfony\Component\Filesystem\Filesystem;
use Rych\Random\Random;
use Rych\Random\Encoder\Base64Encoder;

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 $event
   */
  public function configureProject($event) {

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

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

    $drupalCorePackage = $this->getDrupalCorePackage();
    $corePath = $installationManager->getInstallPath($drupalCorePackage);

    // Directory where the root project is being created
    $projectRoot = getcwd();
    // Directory where Drupal's index.php is located
    $webRoot = dirname($corePath);
    // 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';
    }

    // Link Drupal site's settings files
    $twig_loader = new \Twig_Loader_Array([]);
    $twig = new \Twig_Environment($twig_loader);
    foreach ($this->getFiles($projectRoot, $webRoot, $settingsPath) as $template => $def) {
      $file = $def['dest'] . '/' . $template;
      if (!$fs->exists($file)) {
        $twig_loader->setTemplate($template, file_get_contents($pluginRoot . '/templates/' . $template . '.twig'));
        $rendered = $twig->render($template, $options);
        file_put_contents($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) {
        $settingsPhp .= "\n\nif (file_exists(__DIR__ . '/settings.docker.php')) {include __DIR__ . '/settings.docker.php';}\n";
        file_put_contents($settingsPhpFile, $settingsPhp);
      }
    }

    // Initialize local git working copy
    try {
      $this->git('ignore docker-compose.yml');
      $this->git('ignore settings.docker.php');
    }
    catch (\Exception $ex) {
      // We're ignoring this for now
    }

  }

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

  /**
   * Retrieve excludes from optional "extra" configuration.
   *
   * @return array
   */
  protected function getOptions() {
    $extra = $this->composer->getPackage()->getExtra() + ['docker4drupal' => []];
    $options = $extra['docker4drupal'] + [
        'port' => 8000,
        'drupal' => [
          'version' => '8',
        ],
        'php' => [
          'version' => '7.0',# 5.3|5.6|7.1
          'xdebug' => 1,
        ],
        'nginx' => [
          'version' => '1.10',
        ],
        'varnish' => [
          'enable' => 0,
        ],
        'solr' => [
          'enable' => 0,
        ],
        'node' => [
          'enable' => 0,
        ],
      ];
    return $options;
  }

  /**
   * Wrapper for git command in the root directory.
   *
   * @param $command
   *   Git command name, arguments and/or options.
   * @throws \Exception
   */
  protected function git($command) {
    passthru(escapeshellcmd('git -c "user.email=d8-project@lakedrops.com" ' . $command), $exit_code);
    if ($exit_code !== 0) {
      throw new \Exception('Git returned a non-zero exit code');
    }
  }

}