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<?php

namespace Boxzilla;

class BoxLoader
{

/**
     * @var Plugin
     */
    private $plugin;

/**
     * @var array
     */
    private $box_ids_to_load = array();

/**
     * @var array
     */
    protected $options;

/**
     * Constructor
     *
     * @param Plugin $plugin
     * @param array $options
     */
    public function __construct(Plugin $plugin, array $options)
    {
        $this->plugin = $plugin;
        $this->options = $options;
    }

/**
     * Initializes the plugin, runs on `wp` hook.
     */
    public function init()
    {
        $this->box_ids_to_load = $this->filter_boxes();

// Only add other hooks if necessary
        if (count($this->box_ids_to_load) > 0) {
            add_action('wp_footer', array( $this, 'print_boxes_content' ), 1);
            add_action('wp_enqueue_scripts', array( $this, 'load_assets' ), 90);
        }
    }

/**
     * Get global rules for all boxes
     *
     * @return array
     */
    protected function get_filter_rules()
    {
        $rules = get_option('boxzilla_rules', array());

if (! is_array($rules)) {
            return array();
        }

return $rules;
    }

/**
     * Match a string against an array of patterns, glob-style.
     *
     * @param string $string
     * @param array $patterns
     *
     * @return boolean
     */
    protected function match_patterns($string, $patterns, $contains = false)
    {
        $string = strtolower($string);

foreach ($patterns as $pattern) {
            $pattern = rtrim($pattern, '/');
            $pattern = strtolower($pattern);

// contains means we should do a simple occurrence check
            // does not support wildcards
            if ($contains) {
                return strpos($string, $pattern) !== false;
            }

if (function_exists('fnmatch')) {
                $match = fnmatch($pattern, $string);
            } else {
                $match = ($pattern === $string);
            }

if ($match) {
                return true;
            }
        }

return false;
    }

/**
     * @return string
     */
    protected function get_request_url()
    {
        // strip trailing slashes
        $request_uri = rtrim($_SERVER['REQUEST_URI'], '/');
        return $request_uri;
    }

/**
     * Check if this rule passes (conditional matches expected value)
     *
     * @param string $condition
     * @param string $value
     * @param boolean $qualifier
     *
     * @return bool
     */
    protected function match_rule($condition, $value, $qualifier = true)
    {
        $matched = false;

// cast value to array & trim whitespace or excess comma's
        $value = array_map('trim', explode(',', rtrim(trim($value), ',')));

switch ($condition) {
            case 'everywhere':
                $matched = true;
                break;

case 'is_url':
                $url = $this->get_request_url();
                $matched = $this->match_patterns($url, $value, $qualifier === 'contains' || $qualifier === 'not_contains');
                break;

case 'is_referer':
                if (! empty($_SERVER['HTTP_REFERER'])) {
                    $referer = $_SERVER['HTTP_REFERER'];
                    $matched = $this->match_patterns($referer, $value, $qualifier === 'contains' || $qualifier === 'not_contains');
                }
                break;

case 'is_post_type':
                $post_type = (string) get_post_type();
                $matched = in_array($post_type, (array) $value);
                break;

case 'is_single':
            case 'is_post':
                // convert to empty string if array with just empty string in it
                $value = ($value === array( '' )) ? '' : $value;
                $matched = is_single($value);
                break;

case 'is_post_in_category':
                $matched = is_singular('post') && has_category($value);
                break;

case 'is_page':
                $matched = is_page($value);
                break;

case 'is_post_with_tag':
                $matched = is_singular('post') && has_tag($value);
                break;

case 'is_user_logged_in':
            $matched = is_user_logged_in();
            break;
        }

/**
         * Filters whether a given box rule matches the condition and expected value.
         *
         * The dynamic portion of the hook, `$condition`, refers to the condition being matched.
         *
         * @param boolean $matched
         * @param array $value
         */
        $matched = apply_filters('boxzilla_box_rule_matches_' . $condition, $matched, $value);

// if qualifier is set to false, we need to reverse this value here.
        if (! $qualifier || $qualifier === 'not_contains') {
            $matched = ! $matched;
        }

return $matched;
    }

/**
     * Checks which boxes should be loaded for this request.
     *
     * @return array
     */
    private function filter_boxes()
    {
        $box_ids_to_load = array();
        $rules = $this->get_filter_rules();

foreach ($rules as $box_id => $box_rules) {
            $matched = false;
            $comparision = isset($box_rules['comparision']) ? $box_rules['comparision'] : 'any';
            
            // loop through all rules for all boxes
            foreach ($box_rules as $rule) {

// skip faulty values (and comparision rule)
                if (empty($rule['condition'])) {
                    continue;
                }

$qualifier = isset($rule['qualifier']) ? $rule['qualifier'] : true;
                $matched = $this->match_rule($rule['condition'], $rule['value'], $qualifier);

// break out of loop if we've already matched
                if ($comparision === 'any' && $matched) {
                    break;
                }

// no need to continue if this rule didn't match
                if ($comparision === 'all' && ! $matched) {
                    break;
                }
            }

// value of $matched at this point determines whether box should be loaded
            $load_box = $matched;

/**
             * Filters whether a box should be loaded into the page HTML.
             *
             * The dynamic portion of the hook, `$box_id`, refers to the ID of the box. Return true if you want to output the box.
             *
             * @param boolean $load_box
             */
            $load_box = apply_filters('boxzilla_load_box_' . $box_id, $load_box);

/**
             * Filters whether a box should be loaded into the page HTML.
             *
             * @param boolean $load_box
             * @param int $box_id
             */
            $load_box = apply_filters('boxzilla_load_box', $load_box, $box_id);

// if matched, box should be loaded on this page
            if ($load_box) {
                $box_ids_to_load[] = $box_id;
            }
        }

return $box_ids_to_load;
    }

/**
    * Load plugin styles
    */
    public function load_assets()
    {
        $pre_suffix = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? '' : '.min';
        wp_enqueue_script('boxzilla', $this->plugin->url('/assets/js/script' . $pre_suffix . '.js'), array(), $this->plugin->version(), true);

// create boxzilla_Global_Options object
        $plugin_options = $this->options;
        $boxes = $this->get_matched_boxes();

$data = array(
            'testMode' => (bool) $plugin_options['test_mode'],
            'boxes' => (array) array_map(function (Box $box) {
                return $box->get_client_options();
            }, $boxes),
        );

wp_localize_script('boxzilla', 'boxzilla_options', $data);

do_action('boxzilla_load_assets', $this);
    }

public function print_boxes_content()
    {
        $boxes = $this->get_matched_boxes();
        if (empty($boxes)) {
            return;
        }

echo '<div style="display: none;">';
        foreach ($boxes as $box) {
            echo sprintf('<div id="boxzilla-box-%d-content">', $box->ID) . $box->get_content() . '</div>';
        }
        echo '</div>';
    }

/**
     * Get an array of Box objects. These are the boxes that will be loaded for the current request.
     *
     * @return Box[]
     */
    public function get_matched_boxes()
    {
        static $boxes;

if (is_null($boxes)) {
            if (count($this->box_ids_to_load) === 0) {
                $boxes = array();
                return $boxes;
            }

// query Box posts
            $posts = get_posts(
                array(
                    'post_type' => 'boxzilla-box',
                    'post_status' => 'publish',
                    'post__in'    => $this->box_ids_to_load,
                    'numberposts' => -1
                )
            );

// create `Box` instances out of \WP_Post instances
            $boxes = array();
            foreach ($posts as $key => $post) {
                $box = new Box($post);

// skip boxes without any content
                if ($box->get_content() === '') {
                    continue;
                }

$boxes[ $key ] = $box;
            }
        }

return $boxes;
    }
}