<?php
/**
 * Database management class
 *
 * @package BD_Bookshelf
 */

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

class BDM_Database {

    /**
     * Get table names with prefix
     */
    public static function table($name) {
        global $wpdb;
        return $wpdb->prefix . 'bd_' . $name;
    }

    /**
     * Create all database tables
     */
    public function create_tables() {
        global $wpdb;
        
        $charset_collate = $wpdb->get_charset_collate();
        
        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');

        // Books table
        $sql_books = "CREATE TABLE " . self::table('books') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            title varchar(255) NOT NULL,
            slug varchar(255) NOT NULL,
            description longtext,
            cover_image varchar(500),
            isbn_ebook varchar(20),
            isbn_paperback varchar(20),
            isbn_hardcover varchar(20),
            isbn_audio varchar(20),
            asin_ebook varchar(20),
            asin_paperback varchar(20),
            asin_hardcover varchar(20),
            asin_audio varchar(20),
            amazon_asin varchar(20),
            goodreads_id varchar(20),
            rating_amazon decimal(3,2) DEFAULT 0.00,
            rating_goodreads decimal(3,2) DEFAULT 0.00,
            last_sync datetime,
            series_id bigint(20) unsigned,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            UNIQUE KEY uk_slug (slug),
            KEY idx_series_id (series_id)
        ) $charset_collate;";

        // Book authors table
        $sql_authors = "CREATE TABLE " . self::table('book_authors') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            book_id bigint(20) unsigned NOT NULL,
            author_name varchar(255) NOT NULL,
            author_id bigint(20) unsigned,
            goodreads_author_id varchar(20),
            is_primary tinyint(1) DEFAULT 0,
            sort_order int(11) DEFAULT 0,
            PRIMARY KEY (id),
            KEY idx_book_id (book_id),
            KEY idx_author_id (author_id)
        ) $charset_collate;";

        // Series table
        $sql_series = "CREATE TABLE " . self::table('series') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            name varchar(255) NOT NULL,
            description longtext,
            cover_image varchar(500),
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id)
        ) $charset_collate;";

        // Retail sites table
        $sql_sites = "CREATE TABLE " . self::table('retail_sites') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            name varchar(100) NOT NULL,
            url_pattern text NOT NULL,
            icon varchar(255),
            affiliate_param varchar(50),
            affiliate_code varchar(100),
            is_custom tinyint(1) DEFAULT 0,
            is_active tinyint(1) DEFAULT 1,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id)
        ) $charset_collate;";

        // Retail links table
        $sql_links = "CREATE TABLE " . self::table('retail_links') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            book_id bigint(20) unsigned NOT NULL,
            site_id bigint(20) unsigned NOT NULL,
            format varchar(20) NOT NULL,
            url text NOT NULL,
            is_custom tinyint(1) DEFAULT 0,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            KEY idx_book_id (book_id),
            KEY idx_site_id (site_id),
            KEY idx_format (format)
        ) $charset_collate;";

        // Custom shortcodes table
        $sql_shortcodes = "CREATE TABLE " . self::table('shortcodes') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            slug varchar(100) NOT NULL,
            target_url text NOT NULL,
            redirect_type varchar(10) DEFAULT '301',
            description text,
            click_count bigint(20) DEFAULT 0,
            is_active tinyint(1) DEFAULT 1,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            UNIQUE KEY uk_slug (slug)
        ) $charset_collate;";

        // Shortcode clicks table
        $sql_clicks = "CREATE TABLE " . self::table('shortcode_clicks') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            shortcode_id bigint(20) unsigned NOT NULL,
            clicked_at datetime DEFAULT CURRENT_TIMESTAMP,
            ip_address varchar(45) NOT NULL,
            user_agent text,
            referer varchar(500),
            PRIMARY KEY (id),
            KEY idx_shortcode_id (shortcode_id),
            KEY idx_clicked_at (clicked_at)
        ) $charset_collate;";

        // Book SEO table
        $sql_seo = "CREATE TABLE " . self::table('book_seo') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            book_id bigint(20) unsigned NOT NULL,
            seo_title varchar(255),
            seo_description text,
            seo_keywords varchar(500),
            og_title varchar(255),
            og_description text,
            og_image varchar(500),
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id),
            UNIQUE KEY uk_book_id (book_id)
        ) $charset_collate;";

        // Authors table
        $sql_authors_table = "CREATE TABLE " . self::table('authors') . " (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            display_name varchar(255) NOT NULL,
            email varchar(100),
            website varchar(500),
            bio text,
            goodreads_author_id varchar(20),
            photo_url varchar(500),
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (id)
        ) $charset_collate;";

        dbDelta($sql_books);
        dbDelta($sql_authors);
        dbDelta($sql_series);
        dbDelta($sql_sites);
        dbDelta($sql_links);
        dbDelta($sql_shortcodes);
        dbDelta($sql_clicks);
        dbDelta($sql_seo);
        dbDelta($sql_authors_table);

        // Migration: add asin columns if missing
        $this->maybe_add_columns();

        // Insert default retail sites
        $this->insert_default_sites();

        // Store schema version
        update_option('bd_bookshelf_db_version', BD_BOOKSHELF_VERSION);
    }

    /**
     * Add missing columns to existing tables
     */
    private function maybe_add_columns() {
        global $wpdb;

        $table = self::table('books');
        $columns = $wpdb->get_col("DESCRIBE {$table}", 0);

        $missing = [
            'asin_ebook' => "ALTER TABLE {$table} ADD COLUMN asin_ebook varchar(20) AFTER isbn_audio",
            'asin_paperback' => "ALTER TABLE {$table} ADD COLUMN asin_paperback varchar(20) AFTER asin_ebook",
            'asin_hardcover' => "ALTER TABLE {$table} ADD COLUMN asin_hardcover varchar(20) AFTER asin_paperback",
            'asin_audio' => "ALTER TABLE {$table} ADD COLUMN asin_audio varchar(20) AFTER asin_hardcover",
        ];

        foreach ($missing as $col => $sql) {
            if (!in_array($col, $columns)) {
                $wpdb->query($sql);
            }
        }
    }

    /**
     * Insert default retail sites
     */
    private function insert_default_sites() {
        global $wpdb;

        $table = self::table('retail_sites');
        
        $default_sites = [
            [
                'name' => 'Amazon',
                'url_pattern' => 'https://www.amazon.com/dp/{ISBN}',
                'icon' => 'amazon',
                'affiliate_param' => 'tag',
                'affiliate_code' => '',
                'is_custom' => 0,
                'is_active' => 1,
            ],
            [
                'name' => 'Barnes & Noble',
                'url_pattern' => 'https://www.barnesandnoble.com/w/?ean={ISBN}',
                'icon' => 'barnes-noble',
                'affiliate_param' => '',
                'affiliate_code' => '',
                'is_custom' => 0,
                'is_active' => 1,
            ],
            [
                'name' => 'Apple Books',
                'url_pattern' => 'https://books.apple.com/book/{ISBN}',
                'icon' => 'apple',
                'affiliate_param' => '',
                'affiliate_code' => '',
                'is_custom' => 0,
                'is_active' => 1,
            ],
            [
                'name' => 'Google Play',
                'url_pattern' => 'https://play.google.com/store/search?q={ISBN}&c=books',
                'icon' => 'google',
                'affiliate_param' => '',
                'affiliate_code' => '',
                'is_custom' => 0,
                'is_active' => 1,
            ],
            [
                'name' => 'Kobo',
                'url_pattern' => 'https://www.kobo.com/us/en/ebook/{ISBN}',
                'icon' => 'kobo',
                'affiliate_param' => '',
                'affiliate_code' => '',
                'is_custom' => 0,
                'is_active' => 1,
            ],
        ];

        foreach ($default_sites as $site) {
            $exists = $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT COUNT(*) FROM {$table} WHERE name = %s",
                    $site['name']
                )
            );
            
            if (!$exists) {
                $wpdb->insert($table, $site);
            }
        }
    }

    /**
     * Drop all plugin tables
     */
    public function drop_tables() {
        global $wpdb;

        $tables = [
            'books',
            'book_authors',
            'authors',
            'series',
            'retail_sites',
            'retail_links',
            'shortcodes',
            'shortcode_clicks',
            'book_seo',
        ];

        foreach ($tables as $table) {
            $wpdb->query("DROP TABLE IF EXISTS " . self::table($table));
        }
    }
}