<?php

/**
 * @file
 * Main module file containing hooks.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\system\MenuInterface;
use Drupal\language\ConfigurableLanguageInterface;

/**
 *Implements hook_help().
 *
 * @param $route_name
 * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
 * @return \Drupal\Component\Render\MarkupInterface|null
 */
function simple_sitemap_help($route_name, RouteMatchInterface $route_match) {
  return $route_name === 'help.page.simple_sitemap' ?
    check_markup(file_get_contents(dirname(__FILE__) . "/README.md")) : NULL;
}

/**
 * Implements hook_form_alter().
 *
 * Adds sitemap settings to entity types that are supported via plugins.
 *
 * @param $form
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 * @param $form_id
 */
function simple_sitemap_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  /** @var Drupal\simple_sitemap\Form\FormHelper $f */
  $f = \Drupal::service('simple_sitemap.form_helper');
  if (!$f->processForm($form_state)) {
    return;
  }

  $form['simple_sitemap'] = [
    '#type' => 'details',
    '#group' => isset($form['additional_settings']) ? 'additional_settings' : 'advanced',
    '#title' => t('Simple XML sitemap'),
    '#description' => $f->getEntityCategory() === 'instance' ? t('Settings for this entity can be overridden here.') : '',
    '#weight' => 10,
  ];

  // Attach some js magic to forms.
  if ($f->getEntityCategory() !== 'instance') {
    $form['#attached']['library'][] = 'simple_sitemap/form';
  }

  // Only attach fieldset summary js to 'additional settings' vertical tabs.
  if (isset($form['additional_settings'])) {
    $form['#attached']['library'][] = 'simple_sitemap/fieldsetSummaries';
  }

  $f->displayEntitySettings($form['simple_sitemap'])
  // todo: do not show setting when creating new bundle.
    ->displayRegenerateNow($form['simple_sitemap']);

  // Add submission handler.
  if (isset($form['actions']['submit']['#submit'])) {
    foreach (array_keys($form['actions']) as $action) {
      if ($action !== 'preview'
        && isset($form['actions'][$action]['#type'])
        && $form['actions'][$action]['#type'] === 'submit') {
        $form['actions'][$action]['#submit'][] = 'simple_sitemap_entity_form_submit';
      }
    }
  }
  // Fix for account page rendering other submit handlers not usable.
  else {
    $form['#submit'][] = 'simple_sitemap_entity_form_submit';
  }
}

/**
 * Form submission handler called in hook_form_alter.
 *
 * @param $form
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 */
function simple_sitemap_entity_form_submit($form, FormStateInterface &$form_state) {

  /** @var Drupal\simple_sitemap\Form\FormHelper $f */
  $f = \Drupal::service('simple_sitemap.form_helper');
  if (!$f->processForm($form_state)) {
    return;
  }

  $values = $form_state->getValues();

  // Fix for values appearing in a sub array on a commerce product entity.
  $values = isset($values['simple_sitemap']) ? $values['simple_sitemap'] : $values;

  // Only make changes in DB if sitemap settings actually changed.
  if ($f->valuesChanged($form, $values)) {

    /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
    $generator = \Drupal::service('simple_sitemap.generator');

    $settings = [
      'index' => (bool) $values['simple_sitemap_index_content'],
      'priority' => $values['simple_sitemap_priority'],
      'changefreq' => $values['simple_sitemap_changefreq'],
      'include_images' => (bool) $values['simple_sitemap_include_images'],
    ];

    // Deleting bundle settings for old bundle.
    // See SimplesitemapEntitiesForm::submitForm().
    // todo: This will not be necessary if "multiple variants pro bundle" is implemented.
    if (isset($form['simple_sitemap']['simple_sitemap_variant']['#default_value'])) {
      $old_variant = $form['simple_sitemap']['simple_sitemap_variant']['#default_value'];
      if ($old_variant !== $values['simple_sitemap_variant']) {
        $generator->setVariants($old_variant)->removeBundleSettings($f->getEntityTypeId(), $f->getBundleName());
      }
    }

    switch ($f->getEntityCategory()) {

      case 'bundle':
        $generator->setVariants($values['simple_sitemap_variant'])
          ->setBundleSettings($f->getEntityTypeId(),
            !empty($f->getBundleName()) ? $f->getBundleName() : $f->getFormEntityId(),
          $settings
        );
        break;

      case 'instance':
        $generator->setVariants($values['simple_sitemap_variant'])
          ->setEntityInstanceSettings($f->getEntityTypeId(),
            !empty($f->getInstanceId()) ? $f->getInstanceId() : $f->getFormEntityId(),
            $settings
        );
        break;
    }

    // Regenerate sitemaps according to user setting.
    if ($values['simple_sitemap_regenerate_now']) {
      $generator->rebuildQueue()->generateSitemap();
    }
  }
}

/**
 * Implements hook_cron().
 */
function simple_sitemap_cron() {

  /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
  $generator = \Drupal::service('simple_sitemap.generator');

  if ($generator->getSetting('cron_generate')) {
    $interval = (int) $generator->getSetting('cron_generate_interval', 0) * 60 * 60;
    $request_time = \Drupal::service('datetime.time')->getRequestTime();
    $generation_in_progress = $generator->getQueueWorker()->generationInProgress();
    $state = \Drupal::state();

    if ($interval === 0
      || $generation_in_progress
      || (($state->get('simple_sitemap.last_cron_generate', 0) + $interval) <= $request_time)) {

      if (!$generation_in_progress) {
        $state->set('simple_sitemap.last_cron_generate', $request_time);
      }

      $generator->generateSitemap('cron');
    }
  }
}

/**
 * Implements hook_ENTITY_TYPE_delete().
 *
 * When a language is removed from the system remove it also from settings.
 */
function simple_sitemap_configurable_language_delete(ConfigurableLanguageInterface $language) {

  /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
  $generator = \Drupal::service('simple_sitemap.generator');

  $excluded_languages = $generator->getSetting('excluded_languages');
  if (isset($excluded_languages[$language->id()])) {
    unset($excluded_languages[$language->id()]);
    $generator->saveSetting('excluded_languages', $excluded_languages);
  }
}

/**
 * Implements hook_entity_delete().
 *
 * Removes settings of the removed entity.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 */
function simple_sitemap_entity_delete(EntityInterface $entity) {

  /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
  $generator = \Drupal::service('simple_sitemap.generator');
  $generator->setVariants(TRUE)->removeEntityInstanceSettings(
    $entity->getEntityTypeId(), $entity->id()
  );
}

/**
 * Implements hook_entity_bundle_delete().
 *
 * Removes settings of the removed bundle.
 *
 * @param string $entity_type_id
 * @param string $bundle
 */
function simple_sitemap_entity_bundle_delete($entity_type_id, $bundle) {

  /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
  $generator = \Drupal::service('simple_sitemap.generator');
  $generator->setVariants(TRUE)->removeBundleSettings($entity_type_id, $bundle);
}

/**
 * Implements hook_menu_delete().
 *
 * Removes settings for the removed menu.
 *
 * @param \Drupal\system\MenuInterface $menu
 */
function simple_sitemap_menu_delete(MenuInterface $menu) {

  /** @var \Drupal\simple_sitemap\Simplesitemap $generator */
  $generator = \Drupal::service('simple_sitemap.generator');
  $generator->setVariants(TRUE)->removeBundleSettings('menu_link_content', $menu->id());
}