<?php
// Must be run within DokuWiki
if (!defined('DOKU_INC')) die();

class action_plugin_graveknowledge extends DokuWiki_Action_Plugin {

    public function register(Doku_Event_Handler $controller) {
        // Hook 1: Force cache invalidation dynamically on every request for targets
        $controller->register_hook('PARSER_CACHE_USE', 'BEFORE', $this, 'handle_cache_use');
        
        // Hook 2: Substitute source text content inside target namespace boundaries
        $controller->register_hook('PARSER_WIKITEXT_PREPROCESS', 'BEFORE', $this, 'handle_wikitext_preprocess');
    }

    /**
     * Strict authentication state resolver
     */
    private function is_user_logged_in() {
        if (!empty($_SERVER['REMOTE_USER'])) return true;
        if (function_exists('auth_is_loggedin') && auth_is_loggedin()) return true;
        
        global $_user;
        if (!empty($_user)) return true;

        return false;
    }

    /**
     * Strictly verifies target configurations against absolute namespace roots
     */
    private function is_target($page_id) {
        $raw_namespaces = $this->getConf('target_namespaces');
        if (empty($raw_namespaces)) return false;

        $requested_id = strtolower(cleanID($page_id));
        
        // Split your list by commas
        $patterns = explode(',', $raw_namespaces);

        foreach ($patterns as $pattern) {
            // FIX: Explicitly trim leading/trailing spaces from config settings
            $pattern = trim($pattern);
            if (empty($pattern)) continue;

            // Handle Wildcard Sub-Namespaces strictly (e.g. "explore:earth:people:*")
            if (substr($pattern, -2) === ':*') {
                $base_ns = strtolower(cleanID(substr($pattern, 0, -2)));
                
                // Ensure strict start matching from index 0
                if (strpos($requested_id, $base_ns . ':') === 0) {
                    return true;
                }
            } else {
                // Handle Exact Page Matches strictly
                $pattern_clean = strtolower(cleanID($pattern));
                if ($requested_id === $pattern_clean) {
                    return true;
                }
            }
        }
        return false;
    }

    private function is_restriction_active() {
        $view_start = (int)$this->getConf('night_start_hour');
        $view_end   = (int)$this->getConf('night_end_hour');

        if (isset($_COOKIE['user_tz_offset'])) {
            $offset_seconds = (int)$_COOKIE['user_tz_offset'] * -60;
            $user_hour = (int)gmdate('G', time() + $offset_seconds);
        } else {
            $user_hour = (int)gmdate('G');
        }

        if ($view_start < $view_end) {
            $is_inside_view_window = ($user_hour >= $view_start && $user_hour < $view_end);
        } else {
            $is_inside_view_window = ($view_start === $view_end) || ($user_hour >= $view_start || $user_hour < $view_end);
        }

        return !$is_inside_view_window;
    }

    public function handle_cache_use(Doku_Event $event, $param) {
        global $ID;
        
        // ABSOLUTE ISOLATION EXIT: If page is not a targeted match, abort immediately and do nothing
        if (!$this->is_target($ID)) return;
        if (!page_exists($ID)) return;

        // Force dynamic re-rendering exclusively for targeted locked spaces
        $event->preventDefault();
        $event->stopPropagation();
        $event->result = false;
    }

    public function handle_wikitext_preprocess(Doku_Event $event, $param) {
        // BYPASS COMPLETELY: Do absolutely nothing if the user is authenticated/logged in
        if ($this->is_user_logged_in()) return;

        global $ID;
        
        // ABSOLUTE ISOLATION EXIT: If page is not a targeted match, abort immediately and do nothing
        if (!$this->is_target($ID)) return;
        if (!page_exists($ID)) return;
        
        if (!$this->is_restriction_active()) return;

        $notice_config = $this->getConf('notice_page');
        $notice_page_id = strtolower(cleanID($notice_config));

        if (strtolower(cleanID($ID)) === $notice_page_id) return;

        $notice_file = wikiFN($notice_page_id);
        
        if (@file_exists($notice_file)) {
            $event->data = io_readFile($notice_file);
        } else {
            $event->data = "====== Access Restricted ======\nThis workspace is locked and unavailable at this time.\n\nAccess is permitted exclusively between **" . $this->getConf('night_start_hour') . ":00** and **" . $this->getConf('night_end_hour') . ":00** local time.";
        }
    }
}