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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Config\Definition\Builder;

use Symfony\Component\Config\Definition\ArrayNode;
use Symfony\Component\Config\Definition\Exception\InvalidDefinitionException;
use Symfony\Component\Config\Definition\PrototypedArrayNode;

/**
 * This class provides a fluent interface for defining an array node.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class ArrayNodeDefinition extends NodeDefinition implements ParentNodeDefinitionInterface
{
    protected $performDeepMerging = true;
    protected $ignoreExtraKeys = false;
    protected $removeExtraKeys = true;
    protected $children = [];
    protected $prototype;
    protected $atLeastOne = false;
    protected $allowNewKeys = true;
    protected $key;
    protected $removeKeyItem;
    protected $addDefaults = false;
    protected $addDefaultChildren = false;
    protected $nodeBuilder;
    protected $normalizeKeys = true;

    /**
     * {@inheritdoc}
     */
    public function __construct(?string $name, NodeParentInterface $parent = null)
    {
        parent::__construct($name, $parent);

        $this->nullEquivalent = [];
        $this->trueEquivalent = [];
    }

    /**
     * {@inheritdoc}
     */
    public function setBuilder(NodeBuilder $builder)
    {
        $this->nodeBuilder = $builder;
    }

    /**
     * {@inheritdoc}
     */
    public function children()
    {
        return $this->getNodeBuilder();
    }

    /**
     * Sets a prototype for child nodes.
     *
     * @return NodeDefinition
     */
    public function prototype(string $type)
    {
        return $this->prototype = $this->getNodeBuilder()->node(null, $type)->setParent($this);
    }

    /**
     * @return VariableNodeDefinition
     */
    public function variablePrototype()
    {
        return $this->prototype('variable');
    }

    /**
     * @return ScalarNodeDefinition
     */
    public function scalarPrototype()
    {
        return $this->prototype('scalar');
    }

    /**
     * @return BooleanNodeDefinition
     */
    public function booleanPrototype()
    {
        return $this->prototype('boolean');
    }

    /**
     * @return IntegerNodeDefinition
     */
    public function integerPrototype()
    {
        return $this->prototype('integer');
    }

    /**
     * @return FloatNodeDefinition
     */
    public function floatPrototype()
    {
        return $this->prototype('float');
    }

    /**
     * @return ArrayNodeDefinition
     */
    public function arrayPrototype()
    {
        return $this->prototype('array');
    }

    /**
     * @return EnumNodeDefinition
     */
    public function enumPrototype()
    {
        return $this->prototype('enum');
    }

    /**
     * Adds the default value if the node is not set in the configuration.
     *
     * This method is applicable to concrete nodes only (not to prototype nodes).
     * If this function has been called and the node is not set during the finalization
     * phase, it's default value will be derived from its children default values.
     *
     * @return $this
     */
    public function addDefaultsIfNotSet()
    {
        $this->addDefaults = true;

        return $this;
    }

    /**
     * Adds children with a default value when none are defined.
     *
     * This method is applicable to prototype nodes only.
     *
     * @param int|string|array|null $children The number of children|The child name|The children names to be added
     *
     * @return $this
     */
    public function addDefaultChildrenIfNoneSet($children = null)
    {
        $this->addDefaultChildren = $children;

        return $this;
    }

    /**
     * Requires the node to have at least one element.
     *
     * This method is applicable to prototype nodes only.
     *
     * @return $this
     */
    public function requiresAtLeastOneElement()
    {
        $this->atLeastOne = true;

        return $this;
    }

    /**
     * Disallows adding news keys in a subsequent configuration.
     *
     * If used all keys have to be defined in the same configuration file.
     *
     * @return $this
     */
    public function disallowNewKeysInSubsequentConfigs()
    {
        $this->allowNewKeys = false;

        return $this;
    }

    /**
     * Sets a normalization rule for XML configurations.
     *
     * @param string      $singular The key to remap
     * @param string|null $plural   The plural of the key for irregular plurals
     *
     * @return $this
     */
    public function fixXmlConfig(string $singular, string $plural = null)
    {
        $this->normalization()->remap($singular, $plural);

        return $this;
    }

    /**
     * Sets the attribute which value is to be used as key.
     *
     * This is useful when you have an indexed array that should be an
     * associative array. You can select an item from within the array
     * to be the key of the particular item. For example, if "id" is the
     * "key", then:
     *
     *     [
     *         ['id' => 'my_name', 'foo' => 'bar'],
     *     ];
     *
     *   becomes
     *
     *     [
     *         'my_name' => ['foo' => 'bar'],
     *     ];
     *
     * If you'd like "'id' => 'my_name'" to still be present in the resulting
     * array, then you can set the second argument of this method to false.
     *
     * This method is applicable to prototype nodes only.
     *
     * @param string $name          The name of the key
     * @param bool   $removeKeyItem Whether or not the key item should be removed
     *
     * @return $this
     */
    public function useAttributeAsKey(string $name, bool $removeKeyItem = true)
    {
        $this->key = $name;
        $this->removeKeyItem = $removeKeyItem;

        return $this;
    }

    /**
     * Sets whether the node can be unset.
     *
     * @return $this
     */
    public function canBeUnset(bool $allow = true)
    {
        $this->merge()->allowUnset($allow);

        return $this;
    }

    /**
     * Adds an "enabled" boolean to enable the current section.
     *
     * By default, the section is disabled. If any configuration is specified then
     * the node will be automatically enabled:
     *
     * enableableArrayNode: {enabled: true, ...}   # The config is enabled & default values get overridden
     * enableableArrayNode: ~                      # The config is enabled & use the default values
     * enableableArrayNode: true                   # The config is enabled & use the default values
     * enableableArrayNode: {other: value, ...}    # The config is enabled & default values get overridden
     * enableableArrayNode: {enabled: false, ...}  # The config is disabled
     * enableableArrayNode: false                  # The config is disabled
     *
     * @return $this
     */
    public function canBeEnabled()
    {
        $this
            ->addDefaultsIfNotSet()
            ->treatFalseLike(['enabled' => false])
            ->treatTrueLike(['enabled' => true])
            ->treatNullLike(['enabled' => true])
            ->beforeNormalization()
                ->ifArray()
                ->then(function (array $v) {
                    $v['enabled'] = $v['enabled'] ?? true;

                    return $v;
                })
            ->end()
            ->children()
                ->booleanNode('enabled')
                    ->defaultFalse()
        ;

        return $this;
    }

    /**
     * Adds an "enabled" boolean to enable the current section.
     *
     * By default, the section is enabled.
     *
     * @return $this
     */
    public function canBeDisabled()
    {
        $this
            ->addDefaultsIfNotSet()
            ->treatFalseLike(['enabled' => false])
            ->treatTrueLike(['enabled' => true])
            ->treatNullLike(['enabled' => true])
            ->children()
                ->booleanNode('enabled')
                    ->defaultTrue()
        ;

        return $this;
    }

    /**
     * Disables the deep merging of the node.
     *
     * @return $this
     */
    public function performNoDeepMerging()
    {
        $this->performDeepMerging = false;

        return $this;
    }

    /**
     * Allows extra config keys to be specified under an array without
     * throwing an exception.
     *
     * Those config values are ignored and removed from the resulting
     * array. This should be used only in special cases where you want
     * to send an entire configuration array through a special tree that
     * processes only part of the array.
     *
     * @param bool $remove Whether to remove the extra keys
     *
     * @return $this
     */
    public function ignoreExtraKeys(bool $remove = true)
    {
        $this->ignoreExtraKeys = true;
        $this->removeExtraKeys = $remove;

        return $this;
    }

    /**
     * Sets whether to enable key normalization.
     *
     * @return $this
     */
    public function normalizeKeys(bool $bool)
    {
        $this->normalizeKeys = $bool;

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    public function append(NodeDefinition $node)
    {
        $this->children[$node->name] = $node->setParent($this);

        return $this;
    }

    /**
     * Returns a node builder to be used to add children and prototype.
     *
     * @return NodeBuilder
     */
    protected function getNodeBuilder()
    {
        if (null === $this->nodeBuilder) {
            $this->nodeBuilder = new NodeBuilder();
        }

        return $this->nodeBuilder->setParent($this);
    }

    /**
     * {@inheritdoc}
     */
    protected function createNode()
    {
        if (null === $this->prototype) {
            $node = new ArrayNode($this->name, $this->parent, $this->pathSeparator);

            $this->validateConcreteNode($node);

            $node->setAddIfNotSet($this->addDefaults);

            foreach ($this->children as $child) {
                $child->parent = $node;
                $node->addChild($child->getNode());
            }
        } else {
            $node = new PrototypedArrayNode($this->name, $this->parent, $this->pathSeparator);

            $this->validatePrototypeNode($node);

            if (null !== $this->key) {
                $node->setKeyAttribute($this->key, $this->removeKeyItem);
            }

            if (true === $this->atLeastOne || false === $this->allowEmptyValue) {
                $node->setMinNumberOfElements(1);
            }

            if ($this->default) {
                if (!\is_array($this->defaultValue)) {
                    throw new \InvalidArgumentException(sprintf('%s: the default value of an array node has to be an array.', $node->getPath()));
                }

                $node->setDefaultValue($this->defaultValue);
            }

            if (false !== $this->addDefaultChildren) {
                $node->setAddChildrenIfNoneSet($this->addDefaultChildren);
                if ($this->prototype instanceof static && null === $this->prototype->prototype) {
                    $this->prototype->addDefaultsIfNotSet();
                }
            }

            $this->prototype->parent = $node;
            $node->setPrototype($this->prototype->getNode());
        }

        $node->setAllowNewKeys($this->allowNewKeys);
        $node->addEquivalentValue(null, $this->nullEquivalent);
        $node->addEquivalentValue(true, $this->trueEquivalent);
        $node->addEquivalentValue(false, $this->falseEquivalent);
        $node->setPerformDeepMerging($this->performDeepMerging);
        $node->setRequired($this->required);
        $node->setIgnoreExtraKeys($this->ignoreExtraKeys, $this->removeExtraKeys);
        $node->setNormalizeKeys($this->normalizeKeys);

        if ($this->deprecation) {
            $node->setDeprecated($this->deprecation['package'], $this->deprecation['version'], $this->deprecation['message']);
        }

        if (null !== $this->normalization) {
            $node->setNormalizationClosures($this->normalization->before);
            $node->setXmlRemappings($this->normalization->remappings);
        }

        if (null !== $this->merge) {
            $node->setAllowOverwrite($this->merge->allowOverwrite);
            $node->setAllowFalse($this->merge->allowFalse);
        }

        if (null !== $this->validation) {
            $node->setFinalValidationClosures($this->validation->rules);
        }

        return $node;
    }

    /**
     * Validate the configuration of a concrete node.
     *
     * @throws InvalidDefinitionException
     */
    protected function validateConcreteNode(ArrayNode $node)
    {
        $path = $node->getPath();

        if (null !== $this->key) {
            throw new InvalidDefinitionException(sprintf('->useAttributeAsKey() is not applicable to concrete nodes at path "%s".', $path));
        }

        if (false === $this->allowEmptyValue) {
            throw new InvalidDefinitionException(sprintf('->cannotBeEmpty() is not applicable to concrete nodes at path "%s".', $path));
        }

        if (true === $this->atLeastOne) {
            throw new InvalidDefinitionException(sprintf('->requiresAtLeastOneElement() is not applicable to concrete nodes at path "%s".', $path));
        }

        if ($this->default) {
            throw new InvalidDefinitionException(sprintf('->defaultValue() is not applicable to concrete nodes at path "%s".', $path));
        }

        if (false !== $this->addDefaultChildren) {
            throw new InvalidDefinitionException(sprintf('->addDefaultChildrenIfNoneSet() is not applicable to concrete nodes at path "%s".', $path));
        }
    }

    /**
     * Validate the configuration of a prototype node.
     *
     * @throws InvalidDefinitionException
     */
    protected function validatePrototypeNode(PrototypedArrayNode $node)
    {
        $path = $node->getPath();

        if ($this->addDefaults) {
            throw new InvalidDefinitionException(sprintf('->addDefaultsIfNotSet() is not applicable to prototype nodes at path "%s".', $path));
        }

        if (false !== $this->addDefaultChildren) {
            if ($this->default) {
                throw new InvalidDefinitionException(sprintf('A default value and default children might not be used together at path "%s".', $path));
            }

            if (null !== $this->key && (null === $this->addDefaultChildren || \is_int($this->addDefaultChildren) && $this->addDefaultChildren > 0)) {
                throw new InvalidDefinitionException(sprintf('->addDefaultChildrenIfNoneSet() should set default children names as ->useAttributeAsKey() is used at path "%s".', $path));
            }

            if (null === $this->key && (\is_string($this->addDefaultChildren) || \is_array($this->addDefaultChildren))) {
                throw new InvalidDefinitionException(sprintf('->addDefaultChildrenIfNoneSet() might not set default children names as ->useAttributeAsKey() is not used at path "%s".', $path));
            }
        }
    }

    /**
     * @return NodeDefinition[]
     */
    public function getChildNodeDefinitions()
    {
        return $this->children;
    }

    /**
     * Finds a node defined by the given $nodePath.
     *
     * @param string $nodePath The path of the node to find. e.g "doctrine.orm.mappings"
     */
    public function find(string $nodePath): NodeDefinition
    {
        $firstPathSegment = (false === $pathSeparatorPos = strpos($nodePath, $this->pathSeparator))
            ? $nodePath
            : substr($nodePath, 0, $pathSeparatorPos);

        if (null === $node = ($this->children[$firstPathSegment] ?? null)) {
            throw new \RuntimeException(sprintf('Node with name "%s" does not exist in the current node "%s".', $firstPathSegment, $this->name));
        }

        if (false === $pathSeparatorPos) {
            return $node;
        }

        return $node->find(substr($nodePath, $pathSeparatorPos + \strlen($this->pathSeparator)));
    }
}