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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Config\Block\System\Config;

use Magento\Config\App\Config\Type\System;
use Magento\Config\Model\Config\Reader\Source\Deployed\SettingChecker;
use Magento\Config\Model\Config\Structure\ElementVisibilityInterface;
use Magento\Framework\App\Config\Data\ProcessorInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\DataObject;

/**
 * System config form block
 *
 * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
 * @SuppressWarnings(PHPMD.DepthOfInheritance)
 * @api
 * @since 100.0.2
 */
class Form extends \Magento\Backend\Block\Widget\Form\Generic
{
    public const SCOPE_DEFAULT = 'default';

    public const SCOPE_WEBSITES = 'websites';

    public const SCOPE_STORES = 'stores';

    /**
     * Config data array
     *
     * @var array
     */
    protected $_configData;

    /**
     * Backend config data instance
     *
     * @var \Magento\Config\Model\Config
     */
    protected $_configDataObject;

    /**
     * Default fieldset rendering block
     *
     * @var \Magento\Config\Block\System\Config\Form\Fieldset
     */
    protected $_fieldsetRenderer;

    /**
     * Default field rendering block
     *
     * @var \Magento\Config\Block\System\Config\Form\Field
     */
    protected $_fieldRenderer;

    /**
     * List of fieldset
     *
     * @var array
     */
    protected $_fieldsets = [];

    /**
     * Translated scope labels
     *
     * @var array
     */
    protected $_scopeLabels = [];

    /**
     * Backend Config model factory
     *
     * @var \Magento\Config\Model\Config\Factory
     */
    protected $_configFactory;

    /**
     * Magento\Framework\Data\FormFactory
     *
     * @var \Magento\Framework\Data\FormFactory
     */
    protected $_formFactory;

    /**
     * System config structure
     *
     * @var \Magento\Config\Model\Config\Structure
     */
    protected $_configStructure;

    /**
     * Form fieldset factory
     *
     * @var \Magento\Config\Block\System\Config\Form\Fieldset\Factory
     */
    protected $_fieldsetFactory;

    /**
     * Form field factory
     *
     * @var \Magento\Config\Block\System\Config\Form\Field\Factory
     */
    protected $_fieldFactory;

    /**
     * @var SettingChecker
     */
    private $settingChecker;

    /**
     * @var DeploymentConfig
     */
    private $appConfig;

    /**
     * Checks visibility status of form elements on Stores > Settings > Configuration page in Admin Panel
     * by their paths in the system.xml structure.
     *
     * @var ElementVisibilityInterface
     */
    private $elementVisibility;

    /**
     * @param \Magento\Backend\Block\Template\Context $context
     * @param \Magento\Framework\Registry $registry
     * @param \Magento\Framework\Data\FormFactory $formFactory
     * @param \Magento\Config\Model\Config\Factory $configFactory
     * @param \Magento\Config\Model\Config\Structure $configStructure
     * @param \Magento\Config\Block\System\Config\Form\Fieldset\Factory $fieldsetFactory
     * @param \Magento\Config\Block\System\Config\Form\Field\Factory $fieldFactory
     * @param array $data
     * @param SettingChecker|null $settingChecker
     */
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Data\FormFactory $formFactory,
        \Magento\Config\Model\Config\Factory $configFactory,
        \Magento\Config\Model\Config\Structure $configStructure,
        \Magento\Config\Block\System\Config\Form\Fieldset\Factory $fieldsetFactory,
        \Magento\Config\Block\System\Config\Form\Field\Factory $fieldFactory,
        array $data = [],
        SettingChecker $settingChecker = null
    ) {
        parent::__construct($context, $registry, $formFactory, $data);
        $this->_configFactory = $configFactory;
        $this->_configStructure = $configStructure;
        $this->_fieldsetFactory = $fieldsetFactory;
        $this->_fieldFactory = $fieldFactory;
        $this->settingChecker = $settingChecker ?: ObjectManager::getInstance()->get(SettingChecker::class);

        $this->_scopeLabels = [
            self::SCOPE_DEFAULT => __('[GLOBAL]'),
            self::SCOPE_WEBSITES => __('[WEBSITE]'),
            self::SCOPE_STORES => __('[STORE VIEW]'),
        ];
    }

    /**
     * Initialize objects required to render config form
     *
     * @return $this
     */
    protected function _initObjects()
    {
        $this->_configDataObject = $this->_configFactory->create(
            [
                'data' => [
                    'section' => $this->getSectionCode(),
                    'website' => $this->getWebsiteCode(),
                    'store' => $this->getStoreCode(),
                ],
            ]
        );

        $this->_configData = $this->_configDataObject->load();
        $this->_fieldsetRenderer = $this->_fieldsetFactory->create();
        $this->_fieldRenderer = $this->_fieldFactory->create();
        return $this;
    }

    /**
     * Initialize form
     *
     * @return $this
     */
    public function initForm()
    {
        $this->_initObjects();

        /** @var \Magento\Framework\Data\Form $form */
        $form = $this->_formFactory->create();
        /** @var $section \Magento\Config\Model\Config\Structure\Element\Section */
        $section = $this->_configStructure->getElement($this->getSectionCode());
        if ($section && $section->isVisible($this->getWebsiteCode(), $this->getStoreCode())) {
            foreach ($section->getChildren() as $group) {
                $this->_initGroup($group, $section, $form);
            }
        }

        $this->setForm($form);
        return $this;
    }

    /**
     * Initialize config field group
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Group $group
     * @param \Magento\Config\Model\Config\Structure\Element\Section $section
     * @param \Magento\Framework\Data\Form\AbstractForm $form
     * @return void
     */
    protected function _initGroup(
        \Magento\Config\Model\Config\Structure\Element\Group $group,
        \Magento\Config\Model\Config\Structure\Element\Section $section,
        \Magento\Framework\Data\Form\AbstractForm $form
    ) {
        $frontendModelClass = $group->getFrontendModel();
        $fieldsetRenderer = $frontendModelClass ? $this->_layout->getBlockSingleton(
            $frontendModelClass
        ) : $this->_fieldsetRenderer;

        $fieldsetRenderer->setForm($this);
        $fieldsetRenderer->setConfigData($this->_configData);
        $fieldsetRenderer->setGroup($group);

        $fieldsetConfig = [
            'legend' => $group->getLabel(),
            'comment' => $group->getComment(),
            'expanded' => $group->isExpanded(),
            'group' => $group->getData(),
        ];

        $fieldset = $form->addFieldset($this->_generateElementId($group->getPath()), $fieldsetConfig);
        $fieldset->setRenderer($fieldsetRenderer);
        $group->populateFieldset($fieldset);
        $this->_addElementTypes($fieldset);

        $dependencies = $group->getDependencies($this->getStoreCode());
        $elementName = $this->_generateElementName($group->getPath());
        $elementId = $this->_generateElementId($group->getPath());

        $this->_populateDependenciesBlock($dependencies, $elementId, $elementName);

        if ($group->shouldCloneFields()) {
            $cloneModel = $group->getCloneModel();
            foreach ($cloneModel->getPrefixes() as $prefix) {
                $this->initFields($fieldset, $group, $section, $prefix['field'], $prefix['label']);
            }
        } else {
            $this->initFields($fieldset, $group, $section);
        }

        $this->_fieldsets[$group->getId()] = $fieldset;
    }

    /**
     * Return dependency block object
     *
     * @return \Magento\Backend\Block\Widget\Form\Element\Dependence
     */
    protected function _getDependence()
    {
        if (!$this->getChildBlock('element_dependence')) {
            $this->addChild('element_dependence', \Magento\Backend\Block\Widget\Form\Element\Dependence::class);
        }
        return $this->getChildBlock('element_dependence');
    }

    /**
     * Initialize config group fields
     *
     * @param \Magento\Framework\Data\Form\Element\Fieldset $fieldset
     * @param \Magento\Config\Model\Config\Structure\Element\Group $group
     * @param \Magento\Config\Model\Config\Structure\Element\Section $section
     * @param string $fieldPrefix
     * @param string $labelPrefix
     * @return $this
     */
    public function initFields(
        \Magento\Framework\Data\Form\Element\Fieldset $fieldset,
        \Magento\Config\Model\Config\Structure\Element\Group $group,
        \Magento\Config\Model\Config\Structure\Element\Section $section,
        $fieldPrefix = '',
        $labelPrefix = ''
    ) {
        if (!$this->_configDataObject) {
            $this->_initObjects();
        }

        // Extends for config data
        $extraConfigGroups = [];

        /** @var $element \Magento\Config\Model\Config\Structure\Element\Field */
        foreach ($group->getChildren() as $element) {
            if ($element instanceof \Magento\Config\Model\Config\Structure\Element\Group) {
                $this->_initGroup($element, $section, $fieldset);
            } else {
                $path = $element->getConfigPath() ?: $element->getPath($fieldPrefix);
                if ($element->getSectionId() != $section->getId()) {
                    $groupPath = $element->getGroupPath();
                    if (!isset($extraConfigGroups[$groupPath])) {
                        $this->_configData = $this->_configDataObject->extendConfig(
                            $groupPath,
                            false,
                            $this->_configData
                        );
                        $extraConfigGroups[$groupPath] = true;
                    }
                }
                $this->_initElement($element, $fieldset, $path, $fieldPrefix, $labelPrefix);
            }
        }
        return $this;
    }

    /**
     * Initialize form element
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @param \Magento\Framework\Data\Form\Element\Fieldset $fieldset
     * @param string $path
     * @param string $fieldPrefix
     * @param string $labelPrefix
     * @return void
     */
    protected function _initElement(
        \Magento\Config\Model\Config\Structure\Element\Field $field,
        \Magento\Framework\Data\Form\Element\Fieldset $fieldset,
        $path,
        $fieldPrefix = '',
        $labelPrefix = ''
    ) {
        $inherit = !array_key_exists($path, $this->_configData);
        $data = $this->getFieldData($field, $path);

        $fieldRendererClass = $field->getFrontendModel();
        if ($fieldRendererClass) {
            $fieldRenderer = $this->_layout->getBlockSingleton($fieldRendererClass);
        } else {
            $fieldRenderer = $this->_fieldRenderer;
        }

        $fieldRenderer->setForm($this);
        $fieldRenderer->setConfigData($this->_configData);

        $elementName = $this->_generateElementName($field->getPath(), $fieldPrefix);
        $elementId = $this->_generateElementId($field->getPath($fieldPrefix));

        $dependencies = $field->getDependencies($fieldPrefix, $this->getStoreCode());
        $this->_populateDependenciesBlock($dependencies, $elementId, $elementName);

        $sharedClass = $this->_getSharedCssClass($field);
        $requiresClass = $this->_getRequiresCssClass($field, $fieldPrefix);
        $isReadOnly = $this->isReadOnly($field, $path);

        $formField = $fieldset->addField(
            $elementId,
            $field->getType(),
            [
                'name' => $elementName,
                'label' => $field->getLabel($labelPrefix),
                'comment' => $field->getComment($data),
                'tooltip' => $field->getTooltip(),
                'hint' => $field->getHint(),
                'value' => $data,
                'inherit' => $inherit,
                'class' => $field->getFrontendClass() . $sharedClass . $requiresClass,
                'field_config' => $field->getData(),
                'scope' => $this->getScope(),
                'scope_id' => $this->getScopeId(),
                'scope_label' => $this->getScopeLabel($field),
                'can_use_default_value' => $this->canUseDefaultValue($field->showInDefault()),
                'can_use_website_value' => $this->canUseWebsiteValue($field->showInWebsite()),
                'can_restore_to_default' => $this->isCanRestoreToDefault($field->canRestore()),
                'disabled' => $isReadOnly,
                'is_disable_inheritance' => $isReadOnly
            ]
        );
        $field->populateInput($formField);

        if ($field->hasValidation()) {
            $formField->addClass($field->getValidation());
        }
        if ($field->getType() == 'multiselect') {
            $formField->setCanBeEmpty($field->canBeEmpty());
        }
        if ($field->hasOptions()) {
            $formField->setValues($field->getOptions());
        }
        $formField->setRenderer($fieldRenderer);
    }

    /**
     * Get data of field by path
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @param string $path
     * @return mixed|null|string
     */
    private function getFieldData(\Magento\Config\Model\Config\Structure\Element\Field $field, $path)
    {
        $data = $this->getAppConfigDataValue($path);

        $placeholderValue = $this->settingChecker->getPlaceholderValue(
            $path,
            $this->getScope(),
            $this->getStringScopeCode()
        );

        if ($placeholderValue) {
            $data = $placeholderValue;
        }

        if ($data === null) {
            $path = $field->getConfigPath() !== null ? $field->getConfigPath() : $path;
            $data = $this->getConfigValue($path);
            if ($field->hasBackendModel()) {
                $backendModel = $field->getBackendModel();
                // Backend models which implement ProcessorInterface are processed by ScopeConfigInterface
                if (!$backendModel instanceof ProcessorInterface) {
                    if (array_key_exists($path, $this->_configData)) {
                        $data = $this->_configData[$path];
                    }

                    $backendModel->setPath($path)
                        ->setValue($data)
                        ->setWebsite($this->getWebsiteCode())
                        ->setStore($this->getStoreCode())
                        ->afterLoad();
                    $data = $backendModel->getValue();
                }
            }
        }

        return $data;
    }

    /**
     * Retrieve Scope string code
     *
     * @return string
     */
    private function getStringScopeCode()
    {
        $scopeCode = $this->getData('scope_string_code');

        if (null === $scopeCode) {
            if ($this->getStoreCode()) {
                $scopeCode = $this->_storeManager->getStore($this->getStoreCode())->getCode();
            } elseif ($this->getWebsiteCode()) {
                $scopeCode = $this->_storeManager->getWebsite($this->getWebsiteCode())->getCode();
            } else {
                $scopeCode = '';
            }

            $this->setData('scope_string_code', $scopeCode);
        }

        return $scopeCode;
    }

    /**
     * Populate dependencies block
     *
     * @param array $dependencies
     * @param string $elementId
     * @param string $elementName
     * @return void
     */
    protected function _populateDependenciesBlock(array $dependencies, $elementId, $elementName)
    {
        foreach ($dependencies as $dependentField) {
            /** @var $dependentField \Magento\Config\Model\Config\Structure\Element\Dependency\Field */
            $fieldNameFrom = $this->_generateElementName($dependentField->getId(), null, '_');
            $this->_getDependence()->addFieldMap(
                $elementId,
                $elementName
            )->addFieldMap(
                $this->_generateElementId($dependentField->getId()),
                $fieldNameFrom
            )->addFieldDependence(
                $elementName,
                $fieldNameFrom,
                $dependentField
            );
        }
    }

    /**
     * Generate element name
     *
     * @param string $elementPath
     * @param string $fieldPrefix
     * @param string $separator
     * @return string
     */
    protected function _generateElementName($elementPath, $fieldPrefix = '', $separator = '/')
    {
        $part = explode($separator, $elementPath);
        array_shift($part);
        //shift section name
        $fieldId = array_pop($part);
        //shift filed id
        $groupName = implode('][groups][', $part);
        $name = 'groups[' . $groupName . '][fields][' . $fieldPrefix . $fieldId . '][value]';
        return $name;
    }

    /**
     * Generate element id
     *
     * @param string $path
     * @return string
     */
    protected function _generateElementId($path)
    {
        return $path !== null ? str_replace('/', '_', $path) : '';
    }

    /**
     * Get config value
     *
     * @param string $path
     * @return mixed
     */
    public function getConfigValue($path)
    {
        return $this->_scopeConfig->getValue($path, $this->getScope(), $this->getScopeCode());
    }

    /**
     * @inheritdoc
     */
    protected function _beforeToHtml()
    {
        $this->initForm();
        return parent::_beforeToHtml();
    }

    /**
     * Append dependence block at then end of form block
     *
     * @param string $html
     * @return string
     */
    protected function _afterToHtml($html)
    {
        if ($this->_getDependence()) {
            $html .= $this->_getDependence()->toHtml();
        }
        $html = parent::_afterToHtml($html);
        return $html;
    }

    /**
     * Check if can use default value
     *
     * @param int $fieldValue
     * @return boolean
     */
    public function canUseDefaultValue($fieldValue)
    {
        if ($this->getScope() == self::SCOPE_STORES && $fieldValue) {
            return true;
        }
        if ($this->getScope() == self::SCOPE_WEBSITES && $fieldValue) {
            return true;
        }
        return false;
    }

    /**
     * Check if can use website value
     *
     * @param int $fieldValue
     * @return boolean
     */
    public function canUseWebsiteValue($fieldValue)
    {
        if ($this->getScope() == self::SCOPE_STORES && $fieldValue) {
            return true;
        }
        return false;
    }

    /**
     * Check if can use restore value
     *
     * @param int $fieldValue
     * @return bool
     * @since 100.1.0
     */
    public function isCanRestoreToDefault($fieldValue)
    {
        if ($this->getScope() == self::SCOPE_DEFAULT && $fieldValue) {
            return true;
        }
        return false;
    }

    /**
     * Retrieve current scope
     *
     * @return string
     */
    public function getScope()
    {
        $scope = $this->getData('scope');
        if ($scope === null) {
            if ($this->getStoreCode()) {
                $scope = self::SCOPE_STORES;
            } elseif ($this->getWebsiteCode()) {
                $scope = self::SCOPE_WEBSITES;
            } else {
                $scope = self::SCOPE_DEFAULT;
            }
            $this->setScope($scope);
        }

        return $scope;
    }

    /**
     * Retrieve label for scope
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @return string
     */
    public function getScopeLabel(\Magento\Config\Model\Config\Structure\Element\Field $field)
    {
        $showInStore = $field->showInStore();
        $showInWebsite = $field->showInWebsite();

        if ($showInStore == 1) {
            return $this->_scopeLabels[self::SCOPE_STORES];
        } elseif ($showInWebsite == 1) {
            return $this->_scopeLabels[self::SCOPE_WEBSITES];
        }
        return $this->_scopeLabels[self::SCOPE_DEFAULT];
    }

    /**
     * Get current scope code
     *
     * @return string
     */
    public function getScopeCode()
    {
        $scopeCode = $this->getData('scope_code');
        if ($scopeCode === null) {
            if ($this->getStoreCode()) {
                $scopeCode = $this->getStoreCode();
            } elseif ($this->getWebsiteCode()) {
                $scopeCode = $this->getWebsiteCode();
            } else {
                $scopeCode = '';
            }
            $this->setScopeCode($scopeCode);
        }

        return $scopeCode;
    }

    /**
     * Get current scope code
     *
     * @return int|string
     */
    public function getScopeId()
    {
        $scopeId = $this->getData('scope_id');
        if ($scopeId === null) {
            if ($this->getStoreCode()) {
                $scopeId = $this->_storeManager->getStore($this->getStoreCode())->getId();
            } elseif ($this->getWebsiteCode()) {
                $scopeId = $this->_storeManager->getWebsite($this->getWebsiteCode())->getId();
            } else {
                $scopeId = '';
            }
            $this->setScopeId($scopeId);
        }
        return $scopeId;
    }

    /**
     * Get additional element types
     *
     * @return array
     */
    protected function _getAdditionalElementTypes()
    {
        return [
            'allowspecific' => \Magento\Config\Block\System\Config\Form\Field\Select\Allowspecific::class,
            'image' => \Magento\Config\Block\System\Config\Form\Field\Image::class,
            'file' => \Magento\Config\Block\System\Config\Form\Field\File::class
        ];
    }

    /**
     * Temporary moved those $this->getRequest()->getParam('blabla') from the code across this block
     * to getBlala() methods to be later set from controller with setters
     */

    /**
     * Enter description here...
     *
     * @TODO delete this methods when {^see above^} is done
     * @return string
     * @SuppressWarnings(PHPMD.RequestAwareBlockMethod)
     */
    public function getSectionCode()
    {
        return $this->getRequest()->getParam('section', '');
    }

    /**
     * Enter description here...
     *
     * @TODO delete this methods when {^see above^} is done
     * @return string
     * @SuppressWarnings(PHPMD.RequestAwareBlockMethod)
     */
    public function getWebsiteCode()
    {
        return $this->getRequest()->getParam('website', '');
    }

    /**
     * Enter description here...
     *
     * @TODO delete this methods when {^see above^} is done
     * @return string
     * @SuppressWarnings(PHPMD.RequestAwareBlockMethod)
     */
    public function getStoreCode()
    {
        return $this->getRequest()->getParam('store', '');
    }

    /**
     * Get css class for "shared" functionality
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @return string
     */
    protected function _getSharedCssClass(\Magento\Config\Model\Config\Structure\Element\Field $field)
    {
        $sharedClass = '';
        if ($field->getAttribute('shared') && $field->getConfigPath()) {
            $sharedClass = ' shared shared-' . str_replace('/', '-', $field->getConfigPath());
            return $sharedClass;
        }
        return $sharedClass;
    }

    /**
     * Get css class for "requires" functionality
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @param string $fieldPrefix
     * @return string
     */
    protected function _getRequiresCssClass(\Magento\Config\Model\Config\Structure\Element\Field $field, $fieldPrefix)
    {
        $requiresClass = '';
        $requiredPaths = array_merge($field->getRequiredFields($fieldPrefix), $field->getRequiredGroups($fieldPrefix));
        if (!empty($requiredPaths)) {
            $requiresClass = ' requires';
            foreach ($requiredPaths as $requiredPath) {
                $requiresClass .= ' requires-' . $this->_generateElementId($requiredPath);
            }
            return $requiresClass;
        }
        return $requiresClass;
    }

    /**
     * Retrieve Deployment Configuration object.
     *
     * @deprecated 100.1.2
     * @return DeploymentConfig
     */
    private function getAppConfig()
    {
        if ($this->appConfig === null) {
            $this->appConfig = ObjectManager::getInstance()->get(DeploymentConfig::class);
        }
        return $this->appConfig;
    }

    /**
     * Check Path is Readonly
     *
     * @param \Magento\Config\Model\Config\Structure\Element\Field $field
     * @param string $path
     * @return boolean
     */
    private function isReadOnly(\Magento\Config\Model\Config\Structure\Element\Field $field, $path)
    {
        $isReadOnly = $this->settingChecker->isReadOnly(
            $path,
            ScopeConfigInterface::SCOPE_TYPE_DEFAULT
        );
        if (!$isReadOnly) {
            $isReadOnly = $this->getElementVisibility()->isDisabled($field->getPath())
                ?: $this->settingChecker->isReadOnly($path, $this->getScope(), $this->getStringScopeCode());
        }
        return $isReadOnly;
    }

    /**
     * Retrieve deployment config data value by path
     *
     * @param string $path
     * @return null|string
     */
    private function getAppConfigDataValue($path)
    {
        $appConfig = $this->getAppConfig()->get(System::CONFIG_TYPE);
        $scope = $this->getScope();
        $scopeCode = $this->getStringScopeCode();

        if ($scope === ScopeConfigInterface::SCOPE_TYPE_DEFAULT) {
            $data = new DataObject(isset($appConfig[$scope]) ? $appConfig[$scope] : []);
        } else {
            $data = new DataObject(isset($appConfig[$scope][$scopeCode]) ? $appConfig[$scope][$scopeCode] : []);
        }
        return $data->getData($path);
    }

    /**
     * Gets instance of ElementVisibilityInterface.
     *
     * @return ElementVisibilityInterface
     * @deprecated 101.0.0 Added to not break backward compatibility of the constructor signature
     *             by injecting the new dependency directly.
     *             The method can be removed in a future major release, when constructor signature can be changed.
     * @since 101.0.0
     */
    public function getElementVisibility()
    {
        if (null === $this->elementVisibility) {
            $this->elementVisibility = ObjectManager::getInstance()->get(ElementVisibilityInterface::class);
        }

        return $this->elementVisibility;
    }
}