<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2016 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Component\Router\Rules;

use Joomla\CMS\Component\Router\RouterView;

/**
 * Rule for the standard handling of component routing
 *
 * @since  3.4
 */
class StandardRules implements RulesInterface
{
    /**
     * Router this rule belongs to
     *
     * @var    RouterView
     * @since  3.4
     */
    protected $router;

    /**
     * Class constructor.
     *
     * @param   RouterView  $router  Router this rule belongs to
     *
     * @since   3.4
     */
    public function __construct(RouterView $router)
    {
        $this->router = $router;
    }

    /**
     * Dummy method to fulfil the interface requirements
     *
     * @param   array  &$query  The query array to process
     *
     * @return  void
     *
     * @since   3.4
     */
    public function preprocess(&$query)
    {
    }

    /**
     * Parse the URL
     *
     * @param   array  &$segments  The URL segments to parse
     * @param   array  &$vars      The vars that result from the segments
     *
     * @return  void
     *
     * @since   3.4
     */
    public function parse(&$segments, &$vars)
    {
        // Get the views and the currently active query vars
        $views  = $this->router->getViews();
        $active = $this->router->menu->getActive();

        if ($active) {
            $vars = array_merge($active->query, $vars);
        }

        // We don't have a view or its not a view of this component! We stop here
        if (!isset($vars['view']) || !isset($views[$vars['view']])) {
            return;
        }

        // Copy the segments, so that we can iterate over all of them and at the same time modify the original segments
        $tempSegments = $segments;

        // Iterate over the segments as long as a segment fits
        foreach ($tempSegments as $segment) {
            // Our current view is nestable. We need to check first if the segment fits to that
            if ($views[$vars['view']]->nestable) {
                if (\is_callable(array($this->router, 'get' . ucfirst($views[$vars['view']]->name) . 'Id'))) {
                    $key = \call_user_func_array(array($this->router, 'get' . ucfirst($views[$vars['view']]->name) . 'Id'), array($segment, $vars));

                    // Did we get a proper key? If not, we need to look in the child-views
                    if ($key) {
                        $vars[$views[$vars['view']]->key] = $key;

                        array_shift($segments);

                        continue;
                    }
                } else {
                    // The router is not complete. The get<View>Id() method is missing.
                    return;
                }
            }

            // Lets find the right view that belongs to this segment
            $found = false;

            foreach ($views[$vars['view']]->children as $view) {
                if (!$view->key) {
                    if ($view->name === $segment) {
                        // The segment is a view name
                        $parent       = $views[$vars['view']];
                        $vars['view'] = $view->name;
                        $found        = true;

                        if ($view->parent_key && isset($vars[$parent->key])) {
                            $parent_key              = $vars[$parent->key];
                            $vars[$view->parent_key] = $parent_key;

                            unset($vars[$parent->key]);
                        }

                        break;
                    }
                } elseif (\is_callable(array($this->router, 'get' . ucfirst($view->name) . 'Id'))) {
                    // Hand the data over to the router specific method and see if there is a content item that fits
                    $key = \call_user_func_array(array($this->router, 'get' . ucfirst($view->name) . 'Id'), array($segment, $vars));

                    if ($key) {
                        // Found the right view and the right item
                        $parent       = $views[$vars['view']];
                        $vars['view'] = $view->name;
                        $found        = true;

                        if ($view->parent_key && isset($vars[$parent->key])) {
                            $parent_key              = $vars[$parent->key];
                            $vars[$view->parent_key] = $parent_key;

                            unset($vars[$parent->key]);
                        }

                        $vars[$view->key] = $key;

                        break;
                    }
                }
            }

            if (!$found) {
                return;
            }

            array_shift($segments);
        }
    }

    /**
     * Build a standard URL
     *
     * @param   array  &$query     The vars that should be converted
     * @param   array  &$segments  The URL segments to create
     *
     * @return  void
     *
     * @since   3.4
     */
    public function build(&$query, &$segments)
    {
        if (!isset($query['Itemid'], $query['view'])) {
            return;
        }

        // Get the menu item belonging to the Itemid that has been found
        $item = $this->router->menu->getItem($query['Itemid']);

        if (
            $item === null
            || $item->component !== 'com_' . $this->router->getName()
            || !isset($item->query['view'])
        ) {
            return;
        }

        // Get menu item layout
        $mLayout = isset($item->query['layout']) ? $item->query['layout'] : null;

        // Get all views for this component
        $views = $this->router->getViews();

        // Return directly when the URL of the Itemid is identical with the URL to build
        if ($item->query['view'] === $query['view']) {
            $view = $views[$query['view']];

            if (!$view->key) {
                unset($query['view']);

                if (isset($query['layout']) && $mLayout === $query['layout']) {
                    unset($query['layout']);
                }

                return;
            }

            if (isset($query[$view->key]) && $item->query[$view->key] == (int) $query[$view->key]) {
                unset($query[$view->key]);

                while ($view) {
                    unset($query[$view->parent_key]);

                    $view = $view->parent;
                }

                unset($query['view']);

                if (isset($query['layout']) && $mLayout === $query['layout']) {
                    unset($query['layout']);
                }

                return;
            }
        }

        // Get the path from the view of the current URL and parse it to the menu item
        $path  = array_reverse($this->router->getPath($query), true);
        $found = false;

        foreach ($path as $element => $ids) {
            $view = $views[$element];

            if ($found === false && $item->query['view'] === $element) {
                if ($view->nestable) {
                    $found = true;
                } elseif ($view->children) {
                    $found = true;

                    continue;
                }
            }

            if ($found === false) {
                // Jump to the next view
                continue;
            }

            if ($ids) {
                if ($view->nestable) {
                    $found2 = false;

                    foreach (array_reverse($ids, true) as $id => $segment) {
                        if ($found2) {
                            $segments[] = str_replace(':', '-', $segment);
                        } elseif ((int) $item->query[$view->key] === (int) $id) {
                            $found2 = true;
                        }
                    }
                } elseif ($ids === true) {
                    $segments[] = $element;
                } else {
                    $segments[] = str_replace(':', '-', current($ids));
                }
            }

            if ($view->parent_key) {
                // Remove parent key from query
                unset($query[$view->parent_key]);
            }
        }

        if ($found) {
            unset($query[$views[$query['view']]->key], $query['view']);

            if (isset($query['layout']) && $mLayout === $query['layout']) {
                unset($query['layout']);
            }
        }
    }
}