<?php

declare(strict_types=1);

namespace AdsDestroyer\Admin;

use AdsDestroyer\Settings\OptionsRepository;
use AdsDestroyer\Security\NonceService;
use AdsDestroyer\Security\CapabilitiesService;
use AdsDestroyer\Logging\Logger;

/**
 * Selection Mode Controller for AdsDestroyer plugin.
 * 
 * This class handles the selection mode functionality,
 * including AJAX handlers for enabling/disabling selection mode.
 * 
 * @since 1.0.0
 */
final class SelectionModeController {
    
    private OptionsRepository $options_repository;
    private NonceService $nonce_service;
    private CapabilitiesService $capabilities_service;
    private Logger $logger;
    
    public function __construct(
        OptionsRepository $options_repository,
        NonceService $nonce_service,
        CapabilitiesService $capabilities_service,
        Logger $logger
    ) {
        $this->options_repository = $options_repository;
        $this->nonce_service = $nonce_service;
        $this->capabilities_service = $capabilities_service;
        $this->logger = $logger;
    }
    
    /**
     * Initialize selection mode functionality.
     */
    public function init(): void {
        add_action('wp_ajax_adsd_toggle_selection_mode', [$this, 'handle_toggle_selection_mode']);
        add_action('wp_ajax_adsd_save_element_rule', [$this, 'handle_save_element_rule']);
        add_action('wp_ajax_adsd_test_xpath', [$this, 'handle_test_xpath']);
        
        // Initialize session if not already started
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }
    }
    
    /**
     * Handle AJAX request to toggle selection mode.
     */
    public function handle_toggle_selection_mode(): void {
        // Verify nonce
        if (!$this->nonce_service->verify_nonce($_POST['nonce'] ?? '', 'adsd_selection_mode')) {
            wp_die('Security check failed');
        }
        
        // Check capabilities
        if (!$this->capabilities_service->can_access_selection_mode()) {
            wp_die('Insufficient permissions');
        }
        
        $enable = filter_var($_POST['enable'] ?? false, FILTER_VALIDATE_BOOLEAN);
        
        if ($enable) {
            $_SESSION['adsd_selection_mode'] = true;
            $this->logger->info('Selection mode enabled by user: ' . wp_get_current_user()->user_login);
        } else {
            unset($_SESSION['adsd_selection_mode']);
            $this->logger->info('Selection mode disabled by user: ' . wp_get_current_user()->user_login);
        }
        
        wp_send_json_success([
            'enabled' => $enable,
            'message' => $enable ? 
                __('Selection mode enabled', 'ads-destroyer') : 
                __('Selection mode disabled', 'ads-destroyer'),
        ]);
    }
    
    /**
     * Handle AJAX request to save element rule.
     */
    public function handle_save_element_rule(): void {
        // Verify nonce
        if (!$this->nonce_service->verify_nonce($_POST['nonce'] ?? '', 'adsd_selection_mode')) {
            wp_die('Security check failed');
        }
        
        // Check capabilities
        if (!$this->capabilities_service->can_access_selection_mode()) {
            wp_die('Insufficient permissions');
        }
        
        $xpath = sanitize_text_field($_POST['xpath'] ?? '');
        $description = sanitize_text_field($_POST['description'] ?? '');
        
        if (empty($xpath)) {
            wp_send_json_error(['message' => __('XPath is required', 'ads-destroyer')]);
        }
        
        // Get existing rules
        $rules = $this->options_repository->get_option('rules', []);
        
        // Add new rule
        $new_rule = [
            'id' => uniqid('rule_'),
            'xpath' => $xpath,
            'description' => $description ?: sprintf(__('Rule for %s', 'ads-destroyer'), $xpath),
            'enabled' => true,
            'created_at' => current_time('mysql'),
            'created_by' => wp_get_current_user()->user_login,
        ];
        
        $rules[] = $new_rule;
        
        // Save rules
        $this->options_repository->set_option('rules', $rules);
        
        $this->logger->info('New rule created by user: ' . wp_get_current_user()->user_login . ' - XPath: ' . $xpath);
        
        wp_send_json_success([
            'rule' => $new_rule,
            'message' => __('Rule saved successfully', 'ads-destroyer'),
        ]);
    }
    
    /**
     * Handle AJAX request to test XPath.
     */
    public function handle_test_xpath(): void {
        // Verify nonce
        if (!$this->nonce_service->verify_nonce($_POST['nonce'] ?? '', 'adsd_selection_mode')) {
            wp_die('Security check failed');
        }
        
        // Check capabilities
        if (!$this->capabilities_service->can_access_selection_mode()) {
            wp_die('Insufficient permissions');
        }
        
        $xpath = sanitize_text_field($_POST['xpath'] ?? '');
        
        if (empty($xpath)) {
            wp_send_json_error(['message' => __('XPath is required', 'ads-destroyer')]);
        }
        
        // Test XPath by applying it to current page content
        $test_result = $this->test_xpath_on_current_page($xpath);
        
        wp_send_json_success([
            'valid' => $test_result['valid'],
            'matches' => $test_result['matches'],
            'message' => $test_result['message'],
        ]);
    }
    
    /**
     * Test XPath on current page content.
     * 
     * @param string $xpath
     * @return array
     */
    private function test_xpath_on_current_page(string $xpath): array {
        try {
            // Get current page content with sanitized URL
            $current_uri = sanitize_text_field($_SERVER['REQUEST_URI'] ?? '');
            $url = home_url($current_uri);
            $response = wp_remote_get($url);
            
            if (is_wp_error($response)) {
                return [
                    'valid' => false,
                    'matches' => 0,
                    'message' => __('Could not fetch page content for testing', 'ads-destroyer'),
                ];
            }
            
            $html = wp_remote_retrieve_body($response);
            
            // Create DOMDocument
            $dom = new \DOMDocument();
            libxml_use_internal_errors(true);
            $dom->loadHTML('<?xml encoding="UTF-8">' . $html);
            libxml_clear_errors();
            
            // Create XPath
            $xpath_obj = new \DOMXPath($dom);
            $nodes = $xpath_obj->query($xpath);
            
            if ($nodes === false) {
                return [
                    'valid' => false,
                    'matches' => 0,
                    'message' => __('Invalid XPath expression', 'ads-destroyer'),
                ];
            }
            
            $matches = $nodes->length;
            
            return [
                'valid' => true,
                'matches' => $matches,
                'message' => sprintf(
                    _n(
                        'XPath is valid and matches %d element',
                        'XPath is valid and matches %d elements',
                        $matches,
                        'ads-destroyer'
                    ),
                    $matches
                ),
            ];
            
        } catch (\Exception $e) {
            return [
                'valid' => false,
                'matches' => 0,
                'message' => sprintf(__('Error testing XPath: %s', 'ads-destroyer'), $e->getMessage()),
            ];
        }
    }
}