<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link      https://cakephp.org CakePHP(tm) Project
 * @since     0.2.9
 * @license   https://opensource.org/licenses/mit-license.php MIT License
 */
namespace App\Controller;

use Cake\Controller\Controller;
use Cake\Event\EventInterface;
use App\Model\Entity\User;
use App\WGS\NotificationsHandler\NotificationsHandler;
use Cake\Core\Configure;
use Cake\Http\Response;
use Cake\ORM\Query;
use Cake\I18n\DateTime;
use Cake\I18n\I18n;
use Exception;

/**
 * Application Controller
 *
 * Add your application-wide methods in the class below, your controllers
 * will inherit them.
 *
 * @link https://book.cakephp.org/4/en/controllers.html#the-app-controller
 */
class AppController extends Controller
{
    public ?User $logged_user = null;

    /**
     * Initialization hook method.
     *
     * Use this method to add common initialization code like loading components.
     *
     * e.g. `$this->loadComponent('FormProtection');`
     *
     * @return void
     */
    public function initialize(): void
    {
        parent::initialize();

        $this->loadComponent('Authentication.Authentication');
        $this->loadComponent('Flash');

        // recuperiamo l'entità dello user (se loggato):
        $this->logged_user = $this->Authentication->getIdentity();

        // settiamo il locale come da preferenze utente (se specificato, altrimenti ci pensa il LocaleSelectorMiddleware):
        if (!empty($this->logged_user->language_id)) I18n::setLocale($this->fetchTable('Languages')->get($this->logged_user->language_id)->language_code);
        $this->set('locale', I18n::getLocale());

        /*
         * Enable the following component for recommended CakePHP form protection settings.
         * see https://book.cakephp.org/4/en/controllers/components/form-protection.html
         */
        //$this->loadComponent('FormProtection');
    }

    public function beforeRender(EventInterface  $event)
    {
        if ($this->getRequest()->is(['json', 'xml', 'csv'])) {
            $this->viewBuilder()->disableAutoLayout();
        }

        $sys_admin_menu_items = null;
        $menu_sections = [];
        $menu_items = [];
        $logged_user_id = null;
        $logged_user_description = null;
        $logged_user_access_type_description = null;
        $logged_user_timezone = null;
        $logged_user_organisation_description = null;
        $logged_user_photo = Configure::read('App.defaultUserPhoto');
        $user_notifications_count = 0;
        $user_notifications = [];

        // bisogna recuperare le capabilities utente (se esiste un utente loggato)
        if ($this->logged_user) {
            // menu SYSADMIN da mostrare solo ai SYSADMIN:
            $sys_admin_menu_items = [
                [
                    'title' => __('SYSADMIN'),
                    'icon' => 'lock',
                    'menu_items' => [
                        [
                            'title' => __('Gestione competenze'),
                            'icon' => 'wrench',
                            'link' => '/capabilities',
                        ],
                        [
                            'title' => __('Test notifiche'),
                            'icon' => 'bell',
                            'link' => '/notifications/testAll',
                            'confirm' => __('Procedendo verranno inviate notifiche a tutti gli utenti e le organizzaioni che possiedono uno o più recapiti abilitati alle notifiche! Sei sicuro che vuoi continuare ?'),
                            'method' => 'POST',
                        ],
                    ],

                ],
            ];
            if (!$this->logged_user->sys_admin) $sys_admin_menu_items = null;

            $logged_user_id = $this->logged_user->id;
            $logged_user_description = $this->logged_user->name . ' ' . $this->logged_user->surname;
            $logged_user_access_type_description = $this->logged_user->sys_admin ? 'sys_admin' : ($this->logged_user->passepartout ? 'passepartout' : '');
            $logged_user_timezone = $this->logged_user->timezone ?? Configure::read('App.defaultUserTimezone');
            if (isset($this->logged_user->organisation_id)) {
                $logged_user_organisation_description = $this->fetchTable('Organisations')->get($this->logged_user->organisation_id, contain: ['Actors'])->actor->description;
            }
            if (!empty($this->logged_user->photo)) $logged_user_photo = Configure::read('App.userPhotoSrc') . "/" . $this->logged_user->photo;

            $user_notifications_count = $this->fetchTable('Notifications')->find()->where(['Notifications.user_id' => $this->logged_user->id, 'Notifications.read_by_user IS NULL'])->count();

            $user_notifications = $this->fetchTable('Notifications')
                ->find()
                ->contain('NotificationTypes')
                ->where(['Notifications.user_id' => $this->logged_user->id, 'Notifications.read_by_user IS NULL'])
                ->order(['Notifications.created' => 'DESC'])
                ->all()
                ->reduce(function ($acc, $user_notification) {
                    $notification_info = json_decode($user_notification->info);
                    $body = strlen($notification_info->body) > 200 ? substr($notification_info->body, 0, 197) . '...' : $notification_info->body;
                    $icon = $user_notification->notification_type->icon ?? 'bell';
                    $time_ago = (new DateTime($user_notification->created))->timeAgoInWords();
                    $acc[] = ['id' => $user_notification->id, 'icon' => $icon, 'title' => $notification_info->title, 'body' => $body, 'time_ago' => $time_ago];
                    return $acc;
                }, []);

            $user_capabilityIds_query = $this->logged_user->getCapabilityIds(true);

            $menu_sections_subquery = $this->fetchTable('MenuSections')
                ->find()
                ->select(['MenuSections.id'])
                ->innerJoinWith('Capabilities')
                ->where(['Capabilities.id IN' => $user_capabilityIds_query])
                ->distinct(['MenuSections.id']);

            $menu_sections = $this->fetchTable('MenuSections')
                ->find()
                ->where(['MenuSections.id IN' => $menu_sections_subquery])
                ->order(['MenuSections.id' => 'ASC'])
                ->toArray();

            if (count($menu_sections) > 0) {
                // questo blocco controlla se nella request è presente il query param 'menu_section'
                // se è presente e rappresenta un id di menu_section valido, lo settiamo in sessione utente
                if ($this->getRequest()->getQuery('menu_section')) {
                    $valid_user_menu_section = $this->fetchTable('MenuSections')->find()
                        ->matching('Capabilities')
                        ->where(['Capabilities.id IN' => $user_capabilityIds_query, 'MenuSections.id' => $this->getRequest()->getQuery('menu_section')])
                        ->first();

                    $valid_user_menu_section_id = $valid_user_menu_section ? $valid_user_menu_section->id : $menu_sections[0]->id;

                    $this->getRequest()->getSession()->write('menu_section', $valid_user_menu_section_id);
                }
                $menu_section_id = $this->getRequest()->getSession()->read('menu_section') ?? $menu_sections[0]->id;

                $menu_items_subquery = $this->fetchTable('MenuItems')
                    ->find()
                    ->select(['MenuItems.id'])
                    ->innerJoinWith('Capabilities')
                    ->where(['Capabilities.id IN' => $user_capabilityIds_query])
                    ->where(['MenuItems.menu_item_id IS NULL'])
                    ->where(['MenuItems.menu_section_id' => $menu_section_id])
                    ->distinct(['MenuItems.id']);

                $menu_items = $this->fetchTable('MenuItems')
                    ->find()
                    ->where(['MenuItems.id IN' => $menu_items_subquery])
                    ->order(['MenuItems.menu_order' => 'ASC'])
                    ->toArray();
            }

            if( $this->request->getPath() !== '/notifications/index' )
            {
                $privacy = $this->fetchTable('Privacy')
                    ->find()->orderBy(['created' => 'DESC'])
                    ->first();

                if(isset($privacy))
                {
                    $hasAcceptedPrivacy = $this->fetchTable('PrivacyUsers')->find()->where([
                            'PrivacyUsers.user_id' => $this->logged_user->id,
                            'PrivacyUsers.privacy_id' => $privacy->id
                        ])->first();

                    if(
                        !isset($hasAcceptedPrivacy) &&
                        $this->request->getParam('controller') != 'Privacy' && 
                        $this->request->getParam('action') != 'accept_privacy'
                    ) {
                        return $this->redirect(['controller' => 'Privacy', 'action' => 'accept_privacy']);
                    }
                }
            }
        }

        $this->set('menu_sections', $menu_sections);
        $this->set('menu_items', $menu_items);
        $this->set('sys_admin_menu_items', $sys_admin_menu_items);
        $this->set('logged_user_id', $logged_user_id);
        $this->set('logged_user_description', $logged_user_description);
        $this->set('logged_user_access_type_description', $logged_user_access_type_description);
        $this->set('logged_user_timezone', $logged_user_timezone);
        $this->set('logged_user_organisation_description', $logged_user_organisation_description);
        $this->set('logged_user_photo', $logged_user_photo);
        $this->set('user_notifications_count', $user_notifications_count);
        $this->set('user_notifications', $user_notifications);
    }

	/**
	 * gen_random_code
	 *
	 * @param  Int $length
	 * @return String
	 */
	protected function gen_random_code(Int $length): String {
		$characters = "abcdefghijklmnopqrstuvwxyzABCDERFGHIJKLMNOPQRSTUVWXYZ0123456789";
		$randomString = "";

		for ($i = 0; $i < $length; $i++) {
		  $randomString .= $characters[mt_rand(0, strlen($characters)-1)];
		}
		return $randomString;
	}

	/**
	 * sendNotifications
	 *
	 * @param  Int|Null $co_id
	 * @param  String $notification_code
	 * @param  Array $options
	 * @return void
	 */
	protected function sendNotifications(Int|Null $co_id, String $notification_code, Array $options)
	{
        NotificationsHandler::dispatch($co_id, $notification_code, $options, null, $this->logged_user->id ?? null);
	}

    /**
     * applyFilters
     *
     * @param  Query $query
     * @return Query
     */
    protected function applyFilters(Query $query): Query
    {
        // recuperiamo i parametri per costruire la chiave per memorizzare i filtri in sessione.
        // i filtri sono "scoped" per utente e per route. Quindi per ogni utente possiamo memorizzare
        // filtri relativi a più liste.
        $logged_user_id = $this->logged_user->id;
        $controller = $this->request->getParam('controller');
        $action = $this->request->getParam('action');
        $filter_session_key = "filters-$logged_user_id-$controller-$action";

        // recuperiamo i filtri o dal POST data (significa che sono stati appena applicati)
        // o dalla sessione (se ci sono):
        $filters = $this->request->is('post') ? $this->request->getData('filters') : $this->request->getSession()->read($filter_session_key);
        \Cake\Log\Log::write("debug", 'applyFilters - ' . ($this->request->is('post') ? 'POST received' : 'SESSION retrieved') . ' filters: ' . json_encode($filters));

        // ripuliamo i filtri eliminando prima i valori non validi per ciascun filtro
        // e successivamente eliminiamo direttamente i fitri che non hanno valori validi (rimasti):
        $filters = collection($filters ?? [])
            ->map(function ($filter_values, $filter_id) {
                return collection($filter_values)
                    ->filter(function ($filter_value) {
                        // il controllo con === "0" serve per evitare che il sanitiser elimini
                        // il valore "0" per filtri di tipo "bool"
                        return !empty($filter_value) || $filter_value === "0";
                    })
                    ->reduce(function ($filter_values, $filter_value) {
                        $filter_values[] = $filter_value;
                        return $filter_values;
                    }, []);
            })
            ->filter(function ($filter_values, $filter_id) {
                return !empty($filter_values);
            })
            ->toArray();

        \Cake\Log\Log::write("debug", 'applyFilters - SANITISED filters: ' . json_encode($filters));

        // se non si è riusciti a recuperare filtri
        // o è stato richesto un reset dei filtri tramite POST
        // o non ne sono rimasti a seguito della sanitizzazione,
        // cancelliamo comunque la sessione alla chiave $filter_session_key
        // ed usciamo senza applicare nulla alla query:
        if (empty($filters)) {
            \Cake\Log\Log::write("debug", "applyFilters - DELETING DATA SESSION with key '$filter_session_key'");
            $this->request->getSession()->delete($filter_session_key);
            \Cake\Log\Log::write("debug", 'applyFilters - NO filters to appply!');
            return $query;
        }

        // se abbiamo filtri validi e li abbiamo appena ricevuti (POST), li salviamo in sessione:
        if ($this->request->is('post')) {
            \Cake\Log\Log::write("debug", "applyFilters - WRITING DATA SESSION with key '$filter_session_key': " . json_encode($filters));
            $this->request->getSession()->write($filter_session_key, $filters);
        }

        // array delle possibili associations da gestire nella query con ->leftJoinWith().
        // verrà popolato durante il processo di conversione da filtri a conditions:
        $associations = [];

        // array delle conditions creato a partire dai filters ricevuti, da gestire nella query con ->where()
        $conditions = collection($filters)
            // qui trasformiamo i filtri in conditions in base alla tipologia di filtro ricevuto:
            ->map(function ($filter_values, $filter_id) use (&$associations) {
                // recuperiamo le info sul filtro dalla table 'filters' avendo ricevuto l'id del filtro:
                $filter = $this->fetchTable('Filters')->get((Int)explode("filter_id_", $filter_id)[1]);
                // creazione della condizione in base al tipo di filtro:
                switch ($filter->filter_type) {
                    case 'class':
                    case 'bool':
                            $condition = [$filter->search . ' IN' => $filter_values];
                        break;
                    case 'text':
                        $condition = collection($filter_values)
                            ->map(function ($filter_value) use ($filter) {
                                return [$filter->search . ' LIKE' => $filter_value];
                            })
                            ->reduce(function ($conditions, $condition) {
                                $conditions['OR'][] = $condition;
                                return $conditions;
                            }, ['OR' => []]);
                        break;
                    case 'date':
                        $condition = collection($filter_values)
                            ->map(function ($filter_value) use ($filter) {
                                $date_array = explode(" - ", $filter_value);
                                $from_date = $date_array[0];
                                $to_date = $date_array[1];
                                return [$filter->search . ' >=' => $from_date, $filter->search . ' <=' => $to_date];
                            })
                            ->reduce(function ($conditions, $condition) {
                                $conditions['OR'][] = $condition;
                                return $conditions;
                            }, ['OR' => []]);
                        break;
                    default:
                        break;
                }
                // se il filtro è stato gestito e richiede una association, la inseriamo in apposito array:
                if (!empty($condition) && !empty($filter->associations)) $associations[] = $filter->associations;

                // se il filtro non è stato gestito, restituiamo null; altrimenti restituiamo la condition
                return $condition ?? null;
            })
            // qui eliminiamo eventuali conditions null (generate da filtri non (al momento) gestiti:
            ->filter(function ($condition) {
                return !empty($condition);
            })
            // infine restituiamo l'array_values delle conditions ottenute:
            ->reduce(function ($conditions, $condition) {
                $conditions[] = $condition;
                return $conditions;
            }, []);

        \Cake\Log\Log::write("debug", 'applyFilters - conditions applied: ' . json_encode($conditions));

        if (count($conditions) > 0) $query = $query->where($conditions);

        \Cake\Log\Log::write("debug", 'applyFilters - associations applied: ' . json_encode($associations));

        foreach ($associations as $association) {
            $query = $query->leftJoinWith($association);
        }

        if (count($associations) > 0) {
            $main_table = $query->getRepository()->getAlias();
            $query = $query->distinct(["$main_table.id"]);
            \Cake\Log\Log::write("debug", 'applyFilters - distinct applied: ' . "$main_table.id");
        }

        return $query;
    }

    /**
     * Respond with JSON
     *
     * @param int $statusCode HTTP status code
     * @param null|object|array|string|null $responseBody Content of the response
     * @param string $contentType Content type of the response, default "application/json"
     * @return Response
     */
    public function respond(int $statusCode = 200, null|object|array|string $responseBody = null, string $contentType = "application/json") : Response
    {
        $responseBody = is_object($responseBody) || is_array($responseBody) ? $responseBody : ['result' => $responseBody];

        if ($paging = $this->request->getAttribute('paging')) {
            $responseBody['pagination'] = $paging;
        }

        try {
            $encodedBody = json_encode($responseBody, JSON_THROW_ON_ERROR | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
        } catch (Exception $e) {
            return $this->getResponse()
                ->withStatus(500)
                ->withStringBody(json_encode(['error' => 'Failed to encode JSON response']))
                ->withType('application/json');
        }

        $response = $this->getResponse()
            ->withStatus($statusCode)
            ->withType($contentType)
            ->withStringBody($encodedBody);

        return $response;
    }
}