<?php

namespace KupShop\KupShopBundle\Context;

use Doctrine\DBAL\Exception;
use KupShop\KupShopBundle\Util\Compat\ServiceContainer;
use KupShop\KupShopBundle\Util\Contexts;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Contracts\Service\Attribute\Required;

class PriceLevelContext implements ContextInterface, EmptiableContext
{
    public const SESSION_KEY = 'priceLevel';

    public const PERSISTENT_KEY = 'persistentPriceLevel';

    protected SessionInterface $session;
    protected \KupShop\CatalogBundle\PriceLevel $priceLevel;

    protected ?string $activeId = null;
    protected bool $loaded = false;

    /** @var \PriceLevel[] */
    protected array $activeCache = [];

    /** @var \PriceLevel[]|null */
    private ?array $supported = null;

    public function __construct()
    {
    }

    public function activate(?string $id)
    {
        if (null === $id) {
            trigger_error('Passing $id=null into ContextInterface::activate is deprecated! Use ::clearCache() instead.', \E_USER_DEPRECATED);
        }

        if ($id) {
            $this->activeId = $id;
            $this->loaded = true;
        } else {
            $this->clearCache();
        }

        return $this;
    }

    /**
     * @return \KupShop\CatalogBundle\PriceLevel|\PriceLevel
     */
    public function getById(string $activeId)
    {
        if (!array_key_exists($activeId, $this->activeCache)) {
            $this->priceLevel = ServiceContainer::getService(\KupShop\CatalogBundle\PriceLevel::class)->createFromDB($activeId);
            $this->activeCache[$activeId] = $this->priceLevel;
        }

        return $this->activeCache[$activeId];
    }

    public function getActive(): ?\PriceLevel
    {
        if (is_null($this->activeId)) {
            $activeId = $this->getActiveId();
        } else {
            $activeId = $this->activeId;
        }

        if (!$activeId) {
            return null;
        }

        return $this->getById($activeId);
    }

    protected function validate($id)
    {
        $pricelevel = sqlQueryBuilder()->select('COUNT(id) as count')
                        ->from('price_levels')
                        ->where('id = :id')->setParameter('id', $id)
                        ->execute()->fetch();

        if ($pricelevel['count'] == 1) {
            return true;
        }

        return false;
    }

    protected function loadActive()
    {
        $this->loaded = true;
        if (($active = $this->session->get(self::SESSION_KEY, false)) !== false) {
            return $active;
        }

        $userContext = Contexts::get(UserContext::class);
        /** @var \User|null $user */
        if ($user = $userContext->getActive()) {
            $priceLevelId = null;
            // price level set on user
            if (!empty($user->getUserPriceLevelId())) {
                $priceLevelId = $user->getUserPriceLevelId();
            }

            // price level set on user group
            foreach ($user->getGroups() as $group) {
                if (!empty($group['id_price_level'])) {
                    $priceLevelId = $group['id_price_level'];
                    break;
                }
            }

            // save price level id to session
            $this->session->set(self::SESSION_KEY, $priceLevelId);

            return $priceLevelId;
        }

        return null;
    }

    public function getActiveId(): ?string
    {
        return $this->isEmpty() ? null : $this->activeId ??= $this->loadActive();
    }

    public function clearPriceLevelSession()
    {
        $this->session->remove(static::SESSION_KEY);
    }

    public function clearCache(): void
    {
        $this->clearPriceLevelSession();
        $this->loaded = false;
        $this->activeId = null;
    }

    public function forceEmpty(): void
    {
        $this->loaded = true;
        $this->activeId = null;
    }

    public function isEmpty(): bool
    {
        return $this->loaded && $this->activeId === null;
    }

    /**
     * @return \PriceLevel[]
     *
     * @throws Exception
     * @throws \Doctrine\DBAL\Driver\Exception
     */
    public function getSupported(): array
    {
        if ($this->supported === null) {
            $supported = sqlQueryBuilder()->select('*')
                ->from('price_levels')
                ->execute()
                ->fetchAllAssociative();

            $instances = [];
            foreach ($supported as $pricelevel) {
                $newInstance = new \PriceLevel();
                foreach ($pricelevel as $key => $value) {
                    $newInstance->{$key} = $value;
                }

                $instances[$newInstance->id] = $newInstance;
            }

            $this->supported = $instances;
        }

        return $this->supported;
    }

    public function isValid(string $id): bool
    {
        return $this->validate($id);
    }

    #[Required]
    final public function _setSession(SessionInterface $session): void
    {
        $this->session = $session;
    }

    #[Required]
    final public function _setPriceLevel(\KupShop\CatalogBundle\PriceLevel $priceLevel): void
    {
        $this->priceLevel = $priceLevel;
    }
}