<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2015 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;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Component\Router\Rules\RulesInterface;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * View-based component routing class
 *
 * @since  3.5
 */
abstract class RouterView extends RouterBase
{
    /**
     * Name of the router of the component
     *
     * @var    string
     * @since  3.5
     */
    protected $name;

    /**
     * Array of rules
     *
     * @var    RulesInterface[]
     * @since  3.5
     */
    protected $rules = [];

    /**
     * Views of the component
     *
     * @var    RouterViewConfiguration[]
     * @since  3.5
     */
    protected $views = [];

    /**
     * Register the views of a component
     *
     * @param   RouterViewConfiguration  $view  View configuration object
     *
     * @return  void
     *
     * @since   3.5
     */
    public function registerView(RouterViewConfiguration $view)
    {
        $this->views[$view->name] = $view;
    }

    /**
     * Return an array of registered view objects
     *
     * @return  RouterViewConfiguration[] Array of registered view objects
     *
     * @since   3.5
     */
    public function getViews()
    {
        return $this->views;
    }

    /**
     * Get the path of views from target view to root view
     * including content items of a nestable view
     *
     * @param   array  $query  Array of query elements
     *
     * @return  array List of views including IDs of content items
     *
     * @since   3.5
     */
    public function getPath($query)
    {
        $views  = $this->getViews();
        $result = [];

        // Get the right view object
        if (isset($query['view'], $views[$query['view']])) {
            $viewobj = $views[$query['view']];
        }

        // Get the path from the current item to the root view with all IDs
        if (isset($viewobj)) {
            $path     = array_reverse($viewobj->path);
            $start    = true;
            $childkey = false;

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

                if ($start) {
                    $key   = $view->key;
                    $start = false;
                } else {
                    $key = $childkey;
                }

                $childkey = $view->parent_key;

                if (($key || $view->key) && \is_callable([$this, 'get' . ucfirst($view->name) . 'Segment'])) {
                    if (isset($query[$key])) {
                        $result[$view->name] = \call_user_func_array([$this, 'get' . ucfirst($view->name) . 'Segment'], [$query[$key], $query]);
                    } elseif (isset($query[$view->key])) {
                        $result[$view->name] = \call_user_func_array([$this, 'get' . ucfirst($view->name) . 'Segment'], [$query[$view->key], $query]);
                    } else {
                        $result[$view->name] = [];
                    }
                } else {
                    $result[$view->name] = true;
                }
            }
        }

        return $result;
    }

    /**
     * Get all currently attached rules
     *
     * @return  RulesInterface[]  All currently attached rules in an array
     *
     * @since   3.5
     */
    public function getRules()
    {
        return $this->rules;
    }

    /**
     * Add a number of router rules to the object
     *
     * @param   RulesInterface[]  $rules  Array of JComponentRouterRulesInterface objects
     *
     * @return  void
     *
     * @since   3.5
     */
    public function attachRules($rules)
    {
        foreach ($rules as $rule) {
            $this->attachRule($rule);
        }
    }

    /**
     * Attach a build rule
     *
     * @param   RulesInterface  $rule  The function to be called.
     *
     * @return  void
     *
     * @since   3.5
     */
    public function attachRule(RulesInterface $rule)
    {
        $this->rules[] = $rule;
    }

    /**
     * Remove a build rule
     *
     * @param   RulesInterface  $rule  The rule to be removed.
     *
     * @return   boolean  Was a rule removed?
     *
     * @since   3.5
     */
    public function detachRule(RulesInterface $rule)
    {
        foreach ($this->rules as $id => $r) {
            if ($r == $rule) {
                unset($this->rules[$id]);

                return true;
            }
        }

        return false;
    }

    /**
     * Generic method to preprocess a URL
     *
     * @param   array  $query  An associative array of URL arguments
     *
     * @return  array  The URL arguments to use to assemble the subsequent URL.
     *
     * @since   3.5
     */
    public function preprocess($query)
    {
        // Process the parsed variables based on custom defined rules
        foreach ($this->rules as $rule) {
            $rule->preprocess($query);
        }

        return $query;
    }

    /**
     * Build method for URLs
     *
     * @param   array  &$query  Array of query elements
     *
     * @return  array  Array of URL segments
     *
     * @since   3.5
     */
    public function build(&$query)
    {
        $segments = [];

        // Process the parsed variables based on custom defined rules
        foreach ($this->rules as $rule) {
            $rule->build($query, $segments);
        }

        return $segments;
    }

    /**
     * Parse method for URLs
     *
     * @param   array  &$segments  Array of URL string-segments
     *
     * @return  array  Associative array of query values
     *
     * @since   3.5
     */
    public function parse(&$segments)
    {
        $vars = [];

        // Process the parsed variables based on custom defined rules
        foreach ($this->rules as $rule) {
            $rule->parse($segments, $vars);
        }

        return $vars;
    }

    /**
     * Method to return the name of the router
     *
     * @return  string  Name of the router
     *
     * @since   3.5
     */
    public function getName()
    {
        if (empty($this->name)) {
            $r = null;

            if (!preg_match('/(.*)Router/i', \get_class($this), $r)) {
                throw new \Exception('JLIB_APPLICATION_ERROR_ROUTER_GET_NAME', 500);
            }

            $this->name = str_replace('com_', '', ComponentHelper::getComponentName($this, strtolower($r[1])));
        }

        return $this->name;
    }
}
