<?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;

use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
use Symfony\Component\Config\Definition\Exception\DuplicateKeyException;
use Symfony\Component\Config\Definition\Exception\UnsetKeyException;

/**
 * Represents a prototyped Array node in the config tree.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class PrototypedArrayNode extends ArrayNode
{
    protected $prototype;
    protected $keyAttribute;
    protected $removeKeyAttribute;
    protected $minNumberOfElements;
    protected $defaultValue;

    /**
     * Constructor.
     *
     * @param string $name The Node's name
     * @param NodeInterface $parent The node parent
     */
    public function __construct($name, NodeInterface $parent = null)
    {
        parent::__construct($name, $parent);

        $this->minNumberOfElements = 0;
    }

    /**
     * Sets the minimum number of elements that a prototype based node must
     * contain. By default this is zero, meaning no elements.
     *
     * @param integer $number
     */
    public function setMinNumberOfElements($number)
    {
        $this->minNumberOfElements = $number;
    }

    /**
     * The name of the attribute which value should be used as key.
     *
     * This is only relevant for XML configurations, and only in combination
     * with a prototype based node.
     *
     * For example, if "id" is the keyAttribute, then:
     *
     *     array('id' => 'my_name', 'foo' => 'bar')
     *
     * becomes
     *
     *     'my_name' => array('foo' => 'bar')
     *
     * If $remove is false, the resulting array will still have the
     * "'id' => 'my_name'" item in it.
     *
     * @param string  $attribute The name of the attribute which value is to be used as a key
     * @param Boolean $remove Whether or not to remove the key
     */
    public function setKeyAttribute($attribute, $remove = true)
    {
        $this->keyAttribute = $attribute;
        $this->removeKeyAttribute = $remove;
    }

    /**
     * Sets the default value of this node.
     *
     * @param string $value
     * @throws \InvalidArgumentException if the default value is not an array
     */
    public function setDefaultValue($value)
    {
        if (!is_array($value)) {
            throw new \InvalidArgumentException($this->getPath().': the default value of an array node has to be an array.');
        }

        $this->defaultValue = $value;
    }

    /**
     * Checks if the node has a default value.
     *
     * @return Boolean
     */
    public function hasDefaultValue()
    {
        return true;
    }

    /**
     * Retrieves the default value.
     *
     * @return array The default value
     */
    public function getDefaultValue()
    {
        return $this->defaultValue ?: array();
    }

    /**
     * Sets the node prototype.
     *
     * @param PrototypeNodeInterface $node
     */
    public function setPrototype(PrototypeNodeInterface $node)
    {
        $this->prototype = $node;
    }

    /**
     * Disable adding concrete children for prototyped nodes.
     *
     * @param NodeInterface $node The child node to add
     * @throws \RuntimeException Prototyped array nodes can't have concrete children.
     */
    public function addChild(NodeInterface $node)
    {
        throw new \RuntimeException('A prototyped array node can not have concrete children.');
    }

    /**
     * Finalizes the value of this node.
     *
     * @param mixed $value
     * @return mixed The finalised value
     * @throws UnsetKeyException
     * @throws InvalidConfigurationException if the node doesn't have enough children
     */
    protected function finalizeValue($value)
    {
        if (false === $value) {
            $msg = sprintf('Unsetting key for path "%s", value: %s', $this->getPath(), json_encode($value));
            throw new UnsetKeyException($msg);
        }

        foreach ($value as $k => $v) {
            $this->prototype->setName($k);
            try {
                $value[$k] = $this->prototype->finalize($v);
            } catch (UnsetKeyException $unset) {
                unset($value[$k]);
            }
        }

        if (count($value) < $this->minNumberOfElements) {
            $msg = sprintf('The path "%s" should have at least %d element(s) defined.', $this->getPath(), $this->minNumberOfElements);
            $ex = new InvalidConfigurationException($msg);
            $ex->setPath($this->getPath());

            throw $ex;
        }

        return $value;
    }

    /**
     * Normalizes the value.
     *
     * @param mixed $value The value to normalize
     * @return mixed The normalized value
     */
    protected function normalizeValue($value)
    {
        if (false === $value) {
            return $value;
        }

        $value = $this->remapXml($value);

        $normalized = array();
        foreach ($value as $k => $v) {
            if (null !== $this->keyAttribute && is_array($v)) {
                if (!isset($v[$this->keyAttribute]) && is_int($k)) {
                    $msg = sprintf('The attribute "%s" must be set for path "%s".', $this->keyAttribute, $this->getPath());
                    $ex = new InvalidConfigurationException($msg);
                    $ex->setPath($this->getPath());

                    throw $ex;
                } else if (isset($v[$this->keyAttribute])) {
                    $k = $v[$this->keyAttribute];

                    // remove the key attribute when required
                    if ($this->removeKeyAttribute) {
                        unset($v[$this->keyAttribute]);
                    }

                    // if only "value" is left
                    if (1 == count($v) && isset($v['value'])) {
                        $v = $v['value'];
                    }
                }

                if (array_key_exists($k, $normalized)) {
                    $msg = sprintf('Duplicate key "%s" for path "%s".', $k, $this->getPath());
                    $ex = new DuplicateKeyException($msg);
                    $ex->setPath($this->getPath());

                    throw $ex;
                }
            }

            $this->prototype->setName($k);
            if (null !== $this->keyAttribute) {
                $normalized[$k] = $this->prototype->normalize($v);
            } else {
                $normalized[] = $this->prototype->normalize($v);
            }
        }

        return $normalized;
    }

    /**
     * Merges values together.
     *
     * @param mixed $leftSide The left side to merge.
     * @param mixed $rightSide The right side to merge.
     * @return mixed The merged values
     * @throws InvalidConfigurationException
     * @throws \RuntimeException
     */
    protected function mergeValues($leftSide, $rightSide)
    {
        if (false === $rightSide) {
            // if this is still false after the last config has been merged the
            // finalization pass will take care of removing this key entirely
            return false;
        }

        if (false === $leftSide || !$this->performDeepMerging) {
            return $rightSide;
        }

        foreach ($rightSide as $k => $v) {
            // prototype, and key is irrelevant, so simply append the element
            if (null === $this->keyAttribute) {
                $leftSide[] = $v;
                continue;
            }

            // no conflict
            if (!array_key_exists($k, $leftSide)) {
                if (!$this->allowNewKeys) {
                    $ex = new InvalidConfigurationException(sprintf(
                        'You are not allowed to define new elements for path "%s". ' .
                        'Please define all elements for this path in one config file.',
                        $this->getPath()
                    ));
                    $ex->setPath($this->getPath());

                    throw $ex;
                }

                $leftSide[$k] = $v;
                continue;
            }

            $this->prototype->setName($k);
            $leftSide[$k] = $this->prototype->merge($leftSide[$k], $v);
        }

        return $leftSide;
    }
}