<?php
/**
 * Copyright since 2024 Webshop System
 *
 * Zentrale Registry für den aktuellen Webshop-Kontext (User, Shop, Sprache, etc.)
 *
 * @author    Webshop System
 * @license   GPL v3
 */

class Context
{
    /** @var Context|null */
    protected static $instance;

    /** @var Cart|null */
    public $cart;

    /** @var Customer|null */
    public $customer;

    /** @var Cookie|null */
    public $cookie;

    /** @var Link|null */
    public $link;

    /** @var Country|null */
    public $country;

    /** @var Employee|null */
    public $employee;

    /** @var Controller|null */
    public $controller;

    /** @var Language|null */
    public $language;

    /** @var Currency|null */
    public $currency;

    /** @var Shop|null */
    public $shop;

    /** @var Smarty|null */
    public $smarty;

    /** @var int */
    public $mode;

    /** @var float */
    public $virtualTotalTaxExcluded = 0;

    /** @var float */
    public $virtualTotalTaxIncluded = 0;

    /** @var Translator|null */
    protected $translator = null;

    /** @var int */
    protected $priceComputingPrecision = null;

    /** @var bool|null */
    protected $mobile_device = null;

    /** @var bool|null */
    protected $is_mobile = null;

    /** @var bool|null */
    protected $is_tablet = null;

    /** @var MobileDetect|null */
    public $mobile_detect = null;

    // Device constants
    public const DEVICE_COMPUTER = 1;
    public const DEVICE_TABLET = 2;
    public const DEVICE_MOBILE = 4;

    // Mode constants
    public const MODE_STD = 1;
    public const MODE_STD_CONTRIB = 2;
    public const MODE_HOST_CONTRIB = 4;
    public const MODE_HOST = 8;

    private function __construct()
    {
        // Initialisierung erfolgt später
    }

    /**
     * Singleton-Instanz holen
     * @return Context|null
     */
    public static function getContext()
    {
        if (!isset(self::$instance)) {
            self::$instance = new Context();
        }
        return self::$instance;
    }

    /**
     * Set instance for testing
     *
     * @param Context $testInstance
     */
    public static function setInstanceForTesting($testInstance)
    {
        self::$instance = $testInstance;
    }

    /**
     * Delete testing instance
     */
    public static function deleteTestingInstance()
    {
        self::$instance = null;
    }

    /**
     * Clone current context object
     *
     * @return static
     */
    public function cloneContext()
    {
        return clone $this;
    }

    /**
     * Get MobileDetect tool object
     *
     * @return MobileDetect
     */
    public function getMobileDetect(): MobileDetect
    {
        if ($this->mobile_detect === null) {
            $this->mobile_detect = new MobileDetect();
        }

        return $this->mobile_detect;
    }

    /**
     * Check if visitor's device is a mobile device
     *
     * @return bool
     */
    public function isMobile(): bool
    {
        if ($this->is_mobile === null) {
            $mobileDetect = $this->getMobileDetect();
            $this->is_mobile = $mobileDetect->isMobile();
        }

        return $this->is_mobile;
    }

    /**
     * Check if visitor's device is a tablet device
     *
     * @return bool
     */
    public function isTablet(): bool
    {
        if ($this->is_tablet === null) {
            $mobileDetect = $this->getMobileDetect();
            $this->is_tablet = $mobileDetect->isTablet();
        }

        return $this->is_tablet;
    }

    /**
     * Get mobile device
     *
     * @return bool
     */
    public function getMobileDevice(): bool
    {
        if ($this->mobile_device === null) {
            $this->mobile_device = $this->isMobile() || $this->isTablet();
        }

        return $this->mobile_device;
    }

    /**
     * Get device type
     *
     * @return int
     */
    public function getDevice(): int
    {
        if ($this->isMobile()) {
            return self::DEVICE_MOBILE;
        }

        if ($this->isTablet()) {
            return self::DEVICE_TABLET;
        }

        return self::DEVICE_COMPUTER;
    }

    /**
     * Get current locale
     *
     * @return string
     */
    public function getCurrentLocale()
    {
        if ($this->language) {
            return $this->language->locale;
        }

        return 'en-US';
    }

    /**
     * Update customer in context
     *
     * @param Customer $customer
     */
    public function updateCustomer(Customer $customer)
    {
        // Update the customer in context object
        $this->customer = $customer;

        // Update basic information in the cookie
        if ($this->cookie) {
            $this->cookie->id_customer = (int) $customer->id;
            $this->cookie->customer_lastname = $customer->lastname;
            $this->cookie->customer_firstname = $customer->firstname;
            $this->cookie->passwd = $customer->passwd;
            $this->cookie->logged = true;
            $customer->logged = true;
            $this->cookie->email = $customer->email;
            $this->cookie->is_guest = $customer->isGuest();

            // Handle cart following
            if (Configuration::get('PS_CART_FOLLOWING')
                && (empty($this->cookie->id_cart) || Cart::getNbProducts((int) $this->cookie->id_cart) == 0)
                && $idCart = (int) Cart::lastNoneOrderedCart($this->customer->id)
            ) {
                $this->cart = new Cart($idCart);
                $this->cart->secure_key = $customer->secure_key;
                $this->cookie->id_guest = (int) $this->cart->id_guest;
            } else {
                // Initialize new visit
                if (!$this->cookie->id_guest) {
                    Guest::setNewGuest($this->cookie);
                }

                // Update cart if exists
                if (Validate::isLoadedObject($this->cart)) {
                    $this->cart->secure_key = $customer->secure_key;
                    $this->cart->id_guest = (int) $this->cookie->id_guest;
                    $this->cart->id_customer = (int) $customer->id;
                    $this->cart->updateAddressId($this->cart->id_address_delivery, (int) Address::getFirstCustomerAddressId((int) $customer->id));
                    $this->cart->id_address_delivery = (int) Address::getFirstCustomerAddressId((int) $customer->id);
                    $this->cart->id_address_invoice = (int) Address::getFirstCustomerAddressId((int) $customer->id);
                }
            }

            // Save cart and update cookie
            if (Validate::isLoadedObject($this->cart)) {
                $this->cart->save();
                $this->cookie->id_cart = (int) $this->cart->id;
            }

            // Save cookie
            $this->cookie->write();
        }
    }

    /**
     * Get translator
     *
     * @param bool $isInstaller
     * @return Translator
     */
    public function getTranslator($isInstaller = false)
    {
        if ($this->translator === null) {
            $this->translator = new Translator(
                $this->language ? $this->language->locale : 'en-US',
                null,
                $isInstaller
            );
        }

        return $this->translator;
    }

    /**
     * Get translator from locale
     *
     * @param string $locale
     * @return Translator
     */
    public function getTranslatorFromLocale($locale)
    {
        return new Translator($locale);
    }

    /**
     * Get computing precision
     *
     * @return int
     */
    public function getComputingPrecision()
    {
        if ($this->priceComputingPrecision === null) {
            $this->priceComputingPrecision = (int) Configuration::get('PS_PRICE_DISPLAY_PRECISION');
        }

        return $this->priceComputingPrecision;
    }

    /**
     * Check mobile context
     */
    protected function checkMobileContext()
    {
        $this->getMobileDetect();
    }

    /**
     * Initialize context
     */
    public function initialize()
    {
        $this->checkMobileContext();
        $this->initializeLanguage();
        $this->initializeCurrency();
        $this->initializeShop();
        $this->initializeCountry();
        $this->initializeCustomer();
        $this->initializeCart();
        $this->initializeEmployee();
        $this->initializeController();
        $this->initializeSmarty();
    }

    /**
     * Initialize language
     */
    protected function initializeLanguage()
    {
        if (!$this->language) {
            $id_lang = (int) Configuration::get('PS_LANG_DEFAULT');
            $this->language = new Language($id_lang);
        }
    }

    /**
     * Initialize currency
     */
    protected function initializeCurrency()
    {
        if (!$this->currency) {
            $id_currency = (int) Configuration::get('PS_CURRENCY_DEFAULT');
            $this->currency = new Currency($id_currency);
        }
    }

    /**
     * Initialize shop
     */
    protected function initializeShop()
    {
        if (!$this->shop) {
            $id_shop = (int) Configuration::get('PS_SHOP_DEFAULT');
            $this->shop = new Shop($id_shop);
        }
    }

    /**
     * Initialize country
     */
    protected function initializeCountry()
    {
        if (!$this->country) {
            $id_country = (int) Configuration::get('PS_COUNTRY_DEFAULT');
            $this->country = new Country($id_country);
        }
    }

    /**
     * Initialize customer
     */
    protected function initializeCustomer()
    {
        if (!$this->customer && $this->cookie && $this->cookie->id_customer) {
            $this->customer = new Customer($this->cookie->id_customer);
        }
    }

    /**
     * Initialize cart
     */
    protected function initializeCart()
    {
        if (!$this->cart && $this->cookie && $this->cookie->id_cart) {
            $this->cart = new Cart($this->cookie->id_cart);
        }
    }

    /**
     * Initialize employee
     */
    protected function initializeEmployee()
    {
        if (!$this->employee && $this->cookie && $this->cookie->id_employee) {
            $this->employee = new Employee($this->cookie->id_employee);
        }
    }

    /**
     * Initialize controller
     */
    protected function initializeController()
    {
        if (!$this->controller) {
            $this->controller = new FrontController();
        }
    }

    /**
     * Initialize smarty
     */
    protected function initializeSmarty()
    {
        if (!$this->smarty) {
            $this->smarty = new Smarty();
            $this->smarty->setTemplateDir(_PS_THEME_DIR_);
            $this->smarty->setCompileDir(_PS_CACHE_DIR_ . 'smarty/compile/');
            $this->smarty->setCacheDir(_PS_CACHE_DIR_ . 'smarty/cache/');
        }
    }

    /**
     * Get shop context
     *
     * @return Shop
     */
    public function getShop()
    {
        return $this->shop;
    }

    /**
     * Set shop context
     *
     * @param Shop $shop
     */
    public function setShop(Shop $shop)
    {
        $this->shop = $shop;
    }

    /**
     * Get language context
     *
     * @return Language
     */
    public function getLanguage()
    {
        return $this->language;
    }

    /**
     * Set language context
     *
     * @param Language $language
     */
    public function setLanguage(Language $language)
    {
        $this->language = $language;
    }

    /**
     * Get currency context
     *
     * @return Currency
     */
    public function getCurrency()
    {
        return $this->currency;
    }

    /**
     * Set currency context
     *
     * @param Currency $currency
     */
    public function setCurrency(Currency $currency)
    {
        $this->currency = $currency;
    }

    /**
     * Get customer context
     *
     * @return Customer|null
     */
    public function getCustomer()
    {
        return $this->customer;
    }

    /**
     * Set customer context
     *
     * @param Customer|null $customer
     */
    public function setCustomer($customer)
    {
        $this->customer = $customer;
    }

    /**
     * Get cart context
     *
     * @return Cart|null
     */
    public function getCart()
    {
        return $this->cart;
    }

    /**
     * Set cart context
     *
     * @param Cart|null $cart
     */
    public function setCart($cart)
    {
        $this->cart = $cart;
    }

    /**
     * Get employee context
     *
     * @return Employee|null
     */
    public function getEmployee()
    {
        return $this->employee;
    }

    /**
     * Set employee context
     *
     * @param Employee|null $employee
     */
    public function setEmployee($employee)
    {
        $this->employee = $employee;
    }

    /**
     * Get country context
     *
     * @return Country
     */
    public function getCountry()
    {
        return $this->country;
    }

    /**
     * Set country context
     *
     * @param Country $country
     */
    public function setCountry(Country $country)
    {
        $this->country = $country;
    }

    /**
     * Get controller context
     *
     * @return Controller|null
     */
    public function getController()
    {
        return $this->controller;
    }

    /**
     * Set controller context
     *
     * @param Controller|null $controller
     */
    public function setController($controller)
    {
        $this->controller = $controller;
    }

    /**
     * Get smarty context
     *
     * @return Smarty|null
     */
    public function getSmarty()
    {
        return $this->smarty;
    }

    /**
     * Set smarty context
     *
     * @param Smarty|null $smarty
     */
    public function setSmarty($smarty)
    {
        $this->smarty = $smarty;
    }

    /**
     * Get link context
     *
     * @return Link|null
     */
    public function getLink()
    {
        return $this->link;
    }

    /**
     * Set link context
     *
     * @param Link|null $link
     */
    public function setLink($link)
    {
        $this->link = $link;
    }

    /**
     * Get cookie context
     *
     * @return Cookie|null
     */
    public function getCookie()
    {
        return $this->cookie;
    }

    /**
     * Set cookie context
     *
     * @param Cookie|null $cookie
     */
    public function setCookie($cookie)
    {
        $this->cookie = $cookie;
    }

    /**
     * Get mode
     *
     * @return int
     */
    public function getMode()
    {
        return $this->mode;
    }

    /**
     * Set mode
     *
     * @param int $mode
     */
    public function setMode($mode)
    {
        $this->mode = $mode;
    }

    /**
     * Get virtual total tax excluded
     *
     * @return float
     */
    public function getVirtualTotalTaxExcluded()
    {
        return $this->virtualTotalTaxExcluded;
    }

    /**
     * Set virtual total tax excluded
     *
     * @param float $total
     */
    public function setVirtualTotalTaxExcluded($total)
    {
        $this->virtualTotalTaxExcluded = $total;
    }

    /**
     * Get virtual total tax included
     *
     * @return float
     */
    public function getVirtualTotalTaxIncluded()
    {
        return $this->virtualTotalTaxIncluded;
    }

    /**
     * Set virtual total tax included
     *
     * @param float $total
     */
    public function setVirtualTotalTaxIncluded($total)
    {
        $this->virtualTotalTaxIncluded = $total;
    }

    /**
     * Check if context is initialized
     *
     * @return bool
     */
    public function isInitialized()
    {
        return $this->shop !== null && $this->language !== null && $this->currency !== null;
    }

    /**
     * Reset context
     */
    public function reset()
    {
        $this->cart = null;
        $this->customer = null;
        $this->employee = null;
        $this->controller = null;
        $this->smarty = null;
        $this->link = null;
        $this->cookie = null;
        $this->virtualTotalTaxExcluded = 0;
        $this->virtualTotalTaxIncluded = 0;
    }

    /**
     * Get context as array
     *
     * @return array
     */
    public function toArray()
    {
        return [
            'shop' => $this->shop ? $this->shop->id : null,
            'language' => $this->language ? $this->language->id : null,
            'currency' => $this->currency ? $this->currency->id : null,
            'customer' => $this->customer ? $this->customer->id : null,
            'cart' => $this->cart ? $this->cart->id : null,
            'employee' => $this->employee ? $this->employee->id : null,
            'country' => $this->country ? $this->country->id : null,
            'mode' => $this->mode,
            'device' => $this->getDevice(),
            'is_mobile' => $this->isMobile(),
            'is_tablet' => $this->isTablet()
        ];
    }

    /**
     * Load context from array
     *
     * @param array $data
     */
    public function fromArray($data)
    {
        if (isset($data['shop'])) {
            $this->shop = new Shop($data['shop']);
        }
        if (isset($data['language'])) {
            $this->language = new Language($data['language']);
        }
        if (isset($data['currency'])) {
            $this->currency = new Currency($data['currency']);
        }
        if (isset($data['customer'])) {
            $this->customer = new Customer($data['customer']);
        }
        if (isset($data['cart'])) {
            $this->cart = new Cart($data['cart']);
        }
        if (isset($data['employee'])) {
            $this->employee = new Employee($data['employee']);
        }
        if (isset($data['country'])) {
            $this->country = new Country($data['country']);
        }
        if (isset($data['mode'])) {
            $this->mode = $data['mode'];
        }
    }

    /**
     * Get context hash
     *
     * @return string
     */
    public function getHash()
    {
        return md5(serialize($this->toArray()));
    }

    /**
     * Check if context has changed
     *
     * @param string $previous_hash
     * @return bool
     */
    public function hasChanged($previous_hash)
    {
        return $this->getHash() !== $previous_hash;
    }
}