<?php
// Copyright 2026 Umbra Tools (umbratools.com)
// SPDX-License-Identifier: Apache-2.0

/**
 * Rating Sync Engine class
 *
 * @package BD_Bookshelf
 */

if (!defined('ABSPATH')) {
    exit;
}

class BDM_Rating_Sync {

    /**
     * Constructor
     */
    public function __construct() {
        // Schedule cron job
        add_action('bd_bookshelf_sync_ratings', [$this, 'sync_all_ratings']);
        
        // Register cron interval
        add_filter('cron_schedules', [$this, 'add_cron_interval']);
        
        // Schedule on plugin activation
        if (!wp_next_scheduled('bd_bookshelf_sync_ratings')) {
            wp_schedule_event(time(), 'bd_bookshelf_twelve_hours', 'bd_bookshelf_sync_ratings');
        }
    }

    /**
     * Add custom cron interval
     */
    public function add_cron_interval($schedules) {
        $schedules['bd_bookshelf_twelve_hours'] = [
            'interval' => 43200, // 12 hours in seconds
            'display' => esc_html__('Every 12 Hours', 'bd-bookshelf'),
        ];
        
        return $schedules;
    }

    /**
     * Sync all book ratings
     */
    public function sync_all_ratings() {
        $books = BDM_Book_Manager::get_books(['number' => 999]);
        
        $synced = 0;
        $failed = 0;
        
        foreach ($books as $book) {
            $result = $this->sync_book_rating($book->id);
            
            if ($result) {
                $synced++;
            } else {
                $failed++;
            }
            
            // Delay between requests to avoid rate limiting
            sleep(2);
        }
        
        // Log results
        update_option('bd_bookshelf_last_sync', [
            'time' => current_time('mysql'),
            'synced' => $synced,
            'failed' => $failed,
            'total' => count($books),
        ]);
        
        return ['synced' => $synced, 'failed' => $failed];
    }

    /**
     * Sync rating for a single book
     */
    public function sync_book_rating($book_id) {
        global $wpdb;

        $book = BDM_Book_Manager::get_book($book_id);
        if (!$book) {
            return false;
        }
        
        $amazon_rating = 0;
        $goodreads_rating = 0;
        
        // Sync Amazon rating
        if (!empty($book->amazon_asin) || !empty($book->isbn_ebook)) {
            $isbn = $book->amazon_asin ?: $book->isbn_ebook;
            $amazon_rating = $this->fetch_amazon_rating($isbn);
            
            // Keep last rating if fetch fails
            if ($amazon_rating === false) {
                $amazon_rating = $book->rating_amazon;
            }
        }
        
        // Sync Goodreads rating
        if (!empty($book->goodreads_id)) {
            $goodreads_rating = $this->fetch_goodreads_rating($book->goodreads_id);
            
            // Keep last rating if fetch fails
            if ($goodreads_rating === false) {
                $goodreads_rating = $book->rating_goodreads;
            }
        }
        
        // Update book ratings
        $table = BDM_Database::table('books');
        $wpdb->update(
            $table,
            [
                'rating_amazon' => $amazon_rating,
                'rating_goodreads' => $goodreads_rating,
                'last_sync' => current_time('mysql'),
            ],
            ['id' => $book_id],
            ['%f', '%f', '%s'],
            ['%d']
        );
        
        return true;
    }

    /**
     * Fetch Amazon rating via web scraping
     */
    private function fetch_amazon_rating($isbn) {
        $url = "https://www.amazon.com/dp/{$isbn}";
        
        $response = wp_remote_get($url, [
            'timeout' => 15,
            'headers' => [
                'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
                'Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                'Accept-Language' => 'en-US,en;q=0.5',
            ],
        ]);
        
        if (is_wp_error($response)) {
            error_log('BD Bookshelf: Amazon fetch error - ' . $response->get_error_message());
            return false;
        }
        
        $body = wp_remote_retrieve_body($response);
        
        // Parse rating from HTML
        // Amazon uses data-hook="review-star-rating" or similar
        if (preg_match('/data-hook="review-star-rating"[^>]*>.*?(\d+\.?\d*)\s*out of\s*5/si', $body, $matches)) {
            return (float) $matches[1];
        }
        
        // Alternative pattern
        if (preg_match('/a-icon-alt[^>]*>(\d+\.?\d*)\s*out of\s*\d+ stars/si', $body, $matches)) {
            return (float) $matches[1];
        }
        
        return false;
    }

    /**
     * Fetch Goodreads rating via web scraping
     */
    private function fetch_goodreads_rating($goodreads_id) {
        $url = "https://www.goodreads.com/book/show/{$goodreads_id}";
        
        $response = wp_remote_get($url, [
            'timeout' => 15,
            'headers' => [
                'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
                'Accept' => 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                'Accept-Language' => 'en-US,en;q=0.5',
            ],
        ]);
        
        if (is_wp_error($response)) {
            error_log('BD Bookshelf: Goodreads fetch error - ' . $response->get_error_message());
            return false;
        }
        
        $body = wp_remote_retrieve_body($response);
        
        // Parse rating from HTML
        // Goodreads uses ratingValue in meta or specific class
        if (preg_match('/ratingValue[^>]*>(\d+\.?\d*)</si', $body, $matches)) {
            return (float) $matches[1];
        }
        
        // Alternative pattern
        if (preg_match('/class="RatingStatistics__rating"[^>]*>(\d+\.?\d*)</si', $body, $matches)) {
            return (float) $matches[1];
        }
        
        return false;
    }

    /**
     * Manual sync trigger
     */
    public static function manual_sync() {
        $sync = new self();
        return $sync->sync_all_ratings();
    }

    /**
     * Get last sync info
     */
    public static function get_last_sync_info() {
        return get_option('bd_bookshelf_last_sync', []);
    }
}