<?php

class RscSgg_Resolver
{
  /**
   * @var RscSgg_Environment
   */
  private $environment;

  /**
   * @var RscSgg_Common_Collection
   */
  protected $modules;

  /**
   * @var RscSgg_Http_Request
   */
  protected $request;

  /**
   * @var array
   */
  protected $routes;

  /**
   * @var array
   */
  protected $modulesList;

  /**
   * Constructor
   * @param RscSgg_Environment $environment An instance of current environment
   */
  public function __construct(RscSgg_Environment $environment)
  {
    $this->environment = $environment;
    $this->modules = new RscSgg_Common_Collection();
    $this->request = new RscSgg_Http_Request();
    $this->routes = [];
  }

  /**
   * Returns an instance of environment
   * @return RscSgg_Environment
   */
  public function getEnvironment()
  {
    return $this->environment;
  }

  /**
   * Returns the collection of the found modules
   * @return RscSgg_Common_Collection
   */
  public function getModules()
  {
    return $this->modules;
  }

  public function setModules($modules)
  {
    if (is_array($modules)) {
      $modules = new RscSgg_Common_Collection($modules);
    }

    $this->modules = $modules;
  }

  public function setRoute($slug, $module)
  {
    $this->routes[$slug] = $module;
    return $this;
  }

  /**
   * Installs the modules.
   */
  public function install()
  {
    $modules = $this->getModulesList();

    /** @var RscSgg_Mvc_Module $module */
    foreach ($modules as $name => $module) {
      $module->onInstall();
    }
  }

  /**
   * Retrieves modules and doing initialization
   */
  public function init()
  {
    $config = $this->environment->getConfig();
    $hasHooksPrefix = $config->has('hooks_prefix');

    $modules = $this->getModulesList();

    /** @var RscSgg_Mvc_Module $instance */
    foreach ($modules as $name => $instance) {
      /* Set http request to the module */
      $instance->setRequest($this->request)->onInit();

      /* Register hooks */
      $index = $this->environment->getPluginPath() . '/index.php';

      // register_activation_hook($index, array($instance, 'onInstall'));
      register_deactivation_hook($index, [$instance, 'onDeactivation']);

      if ($name === 'installer') {
        register_uninstall_hook($index, [get_class($instance), 'onUninstall']);
      }

      /* We add module's location to the template & config loaders */

      /** @var Twig_SupTwgSgg_Loader_Filesystem $loader */
      try {
        $loader = $this->environment->getTwig()->getLoader();
        $loader->addPath($instance->getLocation() . '/views', strtolower($name));

        // Add PRO module path to the @namespace.
        if ($instance->getOverloadController()) {
          $prefix = $config->get('pro_modules_prefix');
          $location = $config->get('pro_modules_path') . DIRECTORY_SEPARATOR . $prefix . DIRECTORY_SEPARATOR . ucfirst($name);

          $loader->addPath($location . '/views', strtolower($name) . '_pro');
        }
      } catch (Twig_SupTwgSgg_Error_Loader $e) {
      }

      $configLoader = $config->getLoader();
      $configLoader->add($instance->getLocation() . '/configs', strtolower($name));

      if ($instance->getOverloadController()) {
        $prefix = $config->get('pro_modules_prefix');
        $location = $config->get('pro_modules_path') . DIRECTORY_SEPARATOR . $prefix . DIRECTORY_SEPARATOR . ucfirst($name);

        $configLoader->add($location . '/configs', strtolower($name) . '_pro');
      }

      /* Add module to the resolver */
      $this->modules->add(strtolower($name), $instance);

      if ($hasHooksPrefix) {
        do_action($config->get('hooks_prefix') . 'after_' . strtolower($name) . '_loaded', $this->modules[strtolower($name)]);
      }

      // Try to load global configs for the current module.
      $basepath = $this->environment->getPluginPath() . '/app/configs';
      $filepath = '/modules/' . $instance->getModuleName() . '.php';

      if (file_exists($basepath . $filepath)) {
        $config = $this->environment->getConfig();
        $config->load($filepath);
      }
    }

    if ($hasHooksPrefix) {
      do_action($config->get('hooks_prefix') . 'after_modules_loaded');
    }
  }

  public function reinit()
  {
    if ($this->modules->isEmpty()) {
      return;
    }

    $twig = $this->environment->getTwig()->getLoader();
    $config = $this->environment->getConfig();
    $loader = $config->getLoader();

    foreach ($this->modules as $name => $module) {
      if ($module->getOverloadController()) {
        $prefix = $config->get('pro_modules_prefix');
        $location = $config->get('pro_modules_path') . DIRECTORY_SEPARATOR . $prefix . DIRECTORY_SEPARATOR . ucfirst($name);

        try {
          $twig->addPath($location . '/views', $name . '_pro');
        } catch (Twig_SupTwgSgg_Error_Loader $e) {
          // Do nothing. Path does not exists.
        }

        $loader->add($location . '/configs', $name . '_pro');

        $module->setRequest($this->request);
        $module->onInit();
      }
    }
  }

  /**
   * Parses current routes and loads the module that matched for that route
   */
  public function resolve()
  {
    $query = $this->request->query;

    if (in_array($query->get('page'), array_keys($this->routes))) {
      $name = $this->routes[$query->get('page')];
    } else {
      /** @var RscSgg_Mvc_Module $module */
      $name = $query->get('module', $this->environment->getConfig()->get('default_module'));
    }

    if (!$this->modules->has($name)) {
      wp_die('The module that you requested is not found');
    }

    /** @var RscSgg_Http_Response $response */
    $response = $module = $this->modules->get(strtolower($name))->setRequest($this->request)->handle();

    if (!is_object($response) || !$response instanceof RscSgg_Http_Response) {
      wp_die('The controller must return the response');
    }

    echo $response->getContent();
  }

  /**
   * Returns an array of modules from the cache if it exists
   * @return array|null
   */
  protected function getModulesFromCache()
  {
    return null;
  }

  /**
   * Saving an array of modules to the cache
   * @param array $modules
   */
  protected function setModulesCache(array $modules)
  {
    return null;
  }

  /**
   * Returns an array of found modules or NULL if at least one module did not found
   * @return array|null
   */
  public function getModulesList()
  {
    if (!$this->modulesList) {
      $modulesList = [];
      $modulesLocation = [[dirname(dirname(__FILE__)), 'Rsc'], [$this->environment->getConfig()->get('plugin_source'), $this->environment->getConfig()->get('plugin_prefix')]];

      foreach ($modulesLocation as $locationData) {
        if (!in_array(null, $locationData) && count($locationData) == 2) {
          [$path, $prefix] = $locationData;

          $modules = $this->findModules($path, $prefix);

          if (is_array($modules) && count($modules) > 0) {
            $modulesList = array_merge($modulesList, $modules);
          }
        }
      }

      $this->modulesList = new RscSgg_Common_Collection($modulesList);
    }

    return $this->modulesList;
  }

  public function setModulesList($modulesList)
  {
    $this->modulesList = $modulesList;
  }

  protected function findModules($path, $prefix)
  {
    $modules = [];

    $nodes = glob(trailingslashit($path) . $prefix . '/*');

    if (empty($nodes) || $nodes === false) {
      return null;
    }

    foreach ($nodes as $node) {
      $node = str_replace('\\', '/', $node);

      if (is_dir($node) && file_exists($module = $node . '/Module.php')) {
        $classname = $prefix . '_' . basename($node) . '_Module';
        $name = strtolower(basename(dirname($module)));

        if ($name !== 'mvc') {
          $modules[$name] = new $classname($this->environment, $node, $prefix);
        }
      }
    }

    return $modules;
  }
}
