<?php
/**
 * TMDO_WooCommerce — integration with WooCommerce + WooCommerce Subscriptions.
 *
 * Strategy: WC core has its OWN anti-EAV story (HPOS for orders;
 * `wp_wc_product_meta_lookup` for product search). WPDO's job is to:
 *   1. Register the 20 `wp_wc_*` tables to Custom_Table_Registry
 *      (so doctor / conflict-scan know about them)
 *   2. Add hot-zone fields to Schema_Registry for the legacy postmeta keys
 *      WC still uses on products / orders (when HPOS off)
 *   3. Detect HPOS state and surface it to admin
 *   4. NOT duplicate what WC already does (no shadow lookup tables)
 *
 * This is "Tier 5" in ENTITY_ADAPTER_COOKBOOK.md: integrating with a plugin
 * that has its own anti-EAV solution.
 *
 * @package TMDO
 * @since   2.1.0
 */

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

/**
 * WooCommerce integration. No-op when WC not active.
 */
final class TMDO_WooCommerce {

	/**
	 * Provider key for registry.
	 */
	public const PROVIDER = 'woocommerce';

	/**
	 * All 20 wp_wc_* tables WC core creates. Keyed by suffix (no prefix).
	 *
	 * @var array<string, array{primary_key: string, post_type_link: ?string, description: string, since: string}>
	 */
	private const WC_CORE_TABLES = array(
		'wc_admin_note_actions'           => array(
			'primary_key'    => 'action_id',
			'post_type_link' => null,
			'description'    => 'WC admin notes — action buttons',
			'since'          => 'WC 4.0',
		),
		'wc_admin_notes'                  => array(
			'primary_key'    => 'note_id',
			'post_type_link' => null,
			'description'    => 'WC admin notes',
			'since'          => 'WC 4.0',
		),
		'wc_category_lookup'              => array(
			'primary_key'    => 'category_tree_id',
			'post_type_link' => null,
			'description'    => 'Product category hierarchy lookup',
			'since'          => 'WC 4.6',
		),
		'wc_customer_lookup'              => array(
			'primary_key'    => 'customer_id',
			'post_type_link' => null,
			'description'    => 'Customer aggregate (anti-EAV by WC core)',
			'since'          => 'WC 4.0',
		),
		'wc_download_log'                 => array(
			'primary_key'    => 'download_log_id',
			'post_type_link' => null,
			'description'    => 'Downloadable product access log',
			'since'          => 'WC 3.3',
		),
		'wc_order_addresses'              => array(
			'primary_key'    => 'id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order billing/shipping addresses (HPOS)',
			'since'          => 'WC 8.2',
		),
		'wc_order_coupon_lookup'          => array(
			'primary_key'    => 'order_id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order coupon analytics lookup',
			'since'          => 'WC 4.0',
		),
		'wc_order_operational_data'       => array(
			'primary_key'    => 'id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order operational data (HPOS)',
			'since'          => 'WC 8.2',
		),
		'wc_order_product_lookup'         => array(
			'primary_key'    => 'order_item_id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order product analytics lookup',
			'since'          => 'WC 4.0',
		),
		'wc_order_stats'                  => array(
			'primary_key'    => 'order_id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order statistics (anti-EAV by WC core)',
			'since'          => 'WC 4.0',
		),
		'wc_order_tax_lookup'             => array(
			'primary_key'    => null,
			'post_type_link' => 'shop_order',
			'description'    => 'Order tax analytics lookup',
			'since'          => 'WC 4.0',
		),
		'wc_orders'                       => array(
			'primary_key'    => 'id',
			'post_type_link' => 'shop_order',
			'description'    => 'Orders main table (HPOS)',
			'since'          => 'WC 8.2',
		),
		'wc_orders_meta'                  => array(
			'primary_key'    => 'id',
			'post_type_link' => 'shop_order',
			'description'    => 'Order meta (HPOS replacement for postmeta)',
			'since'          => 'WC 8.2',
		),
		'wc_product_attributes_lookup'    => array(
			'primary_key'    => null,
			'post_type_link' => 'product',
			'description'    => 'Product attributes lookup (faceted search)',
			'since'          => 'WC 4.9',
		),
		'wc_product_download_directories' => array(
			'primary_key'    => 'url_id',
			'post_type_link' => null,
			'description'    => 'Approved download directories',
			'since'          => 'WC 6.5',
		),
		'wc_product_meta_lookup'          => array(
			'primary_key'    => 'product_id',
			'post_type_link' => 'product',
			'description'    => 'Product meta lookup (anti-EAV by WC core)',
			'since'          => 'WC 3.6',
		),
		'wc_rate_limits'                  => array(
			'primary_key'    => 'rate_limit_id',
			'post_type_link' => null,
			'description'    => 'API rate limits',
			'since'          => 'WC 5.6',
		),
		'wc_reserved_stock'               => array(
			'primary_key'    => null,
			'post_type_link' => 'product',
			'description'    => 'Reserved stock (cart hold)',
			'since'          => 'WC 4.5',
		),
		'wc_tax_rate_classes'             => array(
			'primary_key'    => 'tax_rate_class_id',
			'post_type_link' => null,
			'description'    => 'Tax rate classes',
			'since'          => 'WC 3.7',
		),
		'wc_webhooks'                     => array(
			'primary_key'    => 'webhook_id',
			'post_type_link' => null,
			'description'    => 'Webhooks subscriptions',
			'since'          => 'WC 2.6',
		),
	);

	/**
	 * Wire integration. No-op when WC not detected.
	 *
	 * @return void
	 */
	public static function register(): void {
		if ( ! self::is_active() ) {
			return;
		}

		add_action( 'wpdo_register_custom_tables', array( __CLASS__, 'register_custom_tables' ) );
		add_action( 'wpdo_register_fields', array( __CLASS__, 'register_schema_fields' ) );
		// v2.1.6: customer hot fields (_money_spent / _order_count / _last_order) move
		// to Entity_Registry so Hook Bus can route them to wp_wpdo_user_hot once
		// `entity_user` mode advances past `disabled`. See PLAN-entity-user-cutover.md.
		add_action( 'wpdo_register_entity_fields', array( __CLASS__, 'register_user_entity_fields' ) );

		// HPOS recommendation notice — only on WC admin pages, only when:
		// (a) HPOS is OFF, (b) the threshold of legacy orders has been crossed.
		if ( is_admin() ) {
			add_action( 'admin_notices', array( __CLASS__, 'maybe_render_hpos_notice' ) );
		}
	}

	/**
	 * Threshold of legacy `shop_order` posts above which we recommend HPOS.
	 * Below this, the HPOS migration overhead isn't justified.
	 */
	private const HPOS_RECOMMEND_THRESHOLD = 100;

	/**
	 * Option name used to permanently dismiss the notice.
	 */
	private const HPOS_NOTICE_DISMISSED_OPT = 'wpdo_hpos_notice_dismissed';

	/**
	 * Conditionally render the HPOS recommendation admin notice.
	 *
	 * @return void
	 */
	public static function maybe_render_hpos_notice(): void {
		// Already enabled or already dismissed.
		if ( self::is_hpos_enabled() ) {
			return;
		}
		if ( '1' === (string) get_option( self::HPOS_NOTICE_DISMISSED_OPT, '' ) ) {
			return;
		}
		if ( ! current_user_can( 'manage_woocommerce' ) ) {
			return;
		}

		// Handle dismiss action (lightweight, no separate AJAX endpoint).
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only nonce check below.
		if ( ! empty( $_GET['wpdo_hpos_dismiss'] ) ) {
			$nonce = isset( $_GET['_wpnonce'] ) ? sanitize_text_field( wp_unslash( (string) $_GET['_wpnonce'] ) ) : '';
			if ( wp_verify_nonce( $nonce, 'wpdo_hpos_dismiss' ) ) {
				update_option( self::HPOS_NOTICE_DISMISSED_OPT, '1', false );
				return;
			}
		}

		$legacy_count = self::count_legacy_orders();
		if ( $legacy_count < self::HPOS_RECOMMEND_THRESHOLD ) {
			return;
		}

		$dismiss_url  = wp_nonce_url(
			add_query_arg( 'wpdo_hpos_dismiss', '1' ),
			'wpdo_hpos_dismiss'
		);
		$settings_url = admin_url( 'admin.php?page=wc-settings&tab=advanced&section=features' );

		?>
		<div class="notice notice-warning is-dismissible">
			<p>
				<strong>WP Data Optimizer:</strong>
				<?php
				printf(
					/* translators: 1: legacy order count, 2: HPOS settings URL, 3: dismiss URL */
					esc_html__( '偵測到 %1$d 筆 legacy shop_order（postmeta-based）。建議啟用 WooCommerce High Performance Order Storage (HPOS) 加速 order 查詢。前往 %2$s 啟用，或 %3$s 永久隱藏此通知。', '2meet-data-optimizer' ),
					(int) $legacy_count,
					'<a href="' . esc_url( $settings_url ) . '">WooCommerce → 進階 → 功能</a>',
					'<a href="' . esc_url( $dismiss_url ) . '">關閉</a>'
				);
				?>
			</p>
		</div>
		<?php
	}

	/**
	 * Count legacy `shop_order` posts (excluding HPOS table).
	 *
	 * @return int
	 */
	private static function count_legacy_orders(): int {
		global $wpdb;
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
		return (int) $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->posts} WHERE post_type = 'shop_order'" );
	}

	/**
	 * Active when WC class loaded OR WC plugin file exists (loose detect for early bootstrap).
	 *
	 * @return bool
	 */
	public static function is_active(): bool {
		return class_exists( 'WooCommerce' )
			|| ( defined( 'WC_VERSION' ) && WC_VERSION )
			|| file_exists( WP_PLUGIN_DIR . '/woocommerce/woocommerce.php' );
	}

	/**
	 * HPOS (custom orders table) detection.
	 *
	 * @return bool True when HPOS is enabled.
	 */
	public static function is_hpos_enabled(): bool {
		// WC OrderUtil class — modern WC API.
		if ( class_exists( 'Automattic\\WooCommerce\\Utilities\\OrderUtil' )
			&& method_exists( 'Automattic\\WooCommerce\\Utilities\\OrderUtil', 'custom_orders_table_usage_is_enabled' )
		) {
			return (bool) Automattic\WooCommerce\Utilities\OrderUtil::custom_orders_table_usage_is_enabled();
		}
		// Fallback: option check.
		return 'yes' === get_option( 'woocommerce_custom_orders_table_enabled' );
	}

	/**
	 * Detected WC version (or 'unknown').
	 *
	 * @return string
	 */
	public static function wc_version(): string {
		if ( defined( 'WC_VERSION' ) ) {
			return WC_VERSION;
		}
		return 'unknown';
	}

	/**
	 * Register all 20 wp_wc_* tables.
	 *
	 * @param mixed $registry TMDO_Custom_Table_Registry (passed by action).
	 * @return void
	 */
	public static function register_custom_tables( $registry = null ): void {
		if ( ! class_exists( 'TMDO_Custom_Table_Registry' ) ) {
			return;
		}
		$registry = $registry ?: TMDO_Custom_Table_Registry::instance();

		foreach ( self::WC_CORE_TABLES as $name => $meta ) {
			$registry->register(
				self::PROVIDER,
				array(
					'table_name'      => $name,
					'primary_key'     => $meta['primary_key'] ?: 'id',
					'post_type_link'  => $meta['post_type_link'],
					'doctor_callback' => array( __CLASS__, 'doctor_check' ),
					'description'     => $meta['description'] . ' (' . $meta['since'] . ')',
				)
			);
		}

		// Our own commission tracking table (v2.1.0).
		$registry->register(
			self::PROVIDER,
			array(
				'table_name'      => 'wpdo_wc_commissions',
				'primary_key'     => 'id',
				'post_type_link'  => null,
				'doctor_callback' => array( __CLASS__, 'doctor_check' ),
				'description'     => 'Vendor commission tracking (replaces hpct_wc_orders, HPOS-aware) (WPDO 2.1.0)',
			)
		);
	}

	/**
	 * Register hot-zone meta fields for products + orders + customers.
	 *
	 * Delegates to dedicated registrars to keep this method readable.
	 *
	 * @param mixed $schema TMDO_Schema_Registry (passed by action).
	 * @return void
	 */
	public static function register_schema_fields( $schema = null ): void {
		if ( ! class_exists( 'TMDO_Schema_Registry' ) ) {
			return;
		}
		$schema = $schema ?: TMDO_Schema_Registry::instance();

		self::register_product_fields( $schema );

		// Order fields only matter when HPOS is OFF (otherwise WC stores them in wc_orders_meta).
		if ( ! self::is_hpos_enabled() ) {
			self::register_order_fields( $schema );
		}

		// v2.1.6: Customer usermeta hot fields moved out of Schema_Registry — they
		// are now registered via `register_user_entity_fields()` on the
		// `wpdo_register_entity_fields` action so Hook Bus can intercept them.
		// Schema_Registry never had a user-meta interceptor; the previous
		// registration was inert. See PLAN-entity-user-cutover.md.

		// Subscription fields if WC Subscriptions OR wc-linepay-subscription is active.
		if ( self::has_subscriptions() ) {
			self::register_subscription_fields( $schema );
		}
	}

	/**
	 * Product hot fields (search/filter shop pages).
	 *
	 * @param TMDO_Schema_Registry $schema Registry.
	 * @return void
	 */
	private static function register_product_fields( $schema ): void {
		$schema->register_many(
			self::PROVIDER,
			array(
				array(
					'post_type' => 'product',
					'meta_key'  => '_price',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NOT NULL DEFAULT 0',
					'column'    => '_price',
					'indexed'   => true,
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_regular_price',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NOT NULL DEFAULT 0',
					'column'    => '_regular_price',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_sale_price',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NULL',
					'column'    => '_sale_price',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_sku',
					'zone'      => 'hot',
					'data_type' => "varchar(100) NOT NULL DEFAULT ''",
					'column'    => '_sku',
					'indexed'   => true,
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_stock',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NULL',
					'column'    => '_stock',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_stock_status',
					'zone'      => 'hot',
					'data_type' => "varchar(20) NOT NULL DEFAULT 'instock'",
					'column'    => '_stock_status',
					'indexed'   => true,
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_visibility',
					'zone'      => 'hot',
					'data_type' => "varchar(20) NOT NULL DEFAULT 'visible'",
					'column'    => '_visibility',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_featured',
					'zone'      => 'hot',
					'data_type' => "varchar(3) NOT NULL DEFAULT 'no'",
					'column'    => '_featured',
					'indexed'   => true,
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_tax_status',
					'zone'      => 'hot',
					'data_type' => "varchar(20) NOT NULL DEFAULT 'taxable'",
					'column'    => '_tax_status',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_virtual',
					'zone'      => 'hot',
					'data_type' => "varchar(3) NOT NULL DEFAULT 'no'",
					'column'    => '_virtual',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_downloadable',
					'zone'      => 'hot',
					'data_type' => "varchar(3) NOT NULL DEFAULT 'no'",
					'column'    => '_downloadable',
				),
			)
		);

		// Cold zone — large display fields rarely searched but always shown.
		$schema->register_many(
			self::PROVIDER,
			array(
				array(
					'post_type'   => 'product',
					'meta_key'    => '_product_attributes',
					'zone'        => 'cold',
					'cache_group' => 'wpdo_cold_product',
					'cache_ttl'   => HOUR_IN_SECONDS,
				),
				array(
					'post_type'   => 'product',
					'meta_key'    => '_purchase_note',
					'zone'        => 'cold',
					'cache_group' => 'wpdo_cold_product',
					'cache_ttl'   => HOUR_IN_SECONDS,
				),
			)
		);
	}

	/**
	 * Order hot fields (legacy postmeta path; only registered when HPOS off).
	 *
	 * @param TMDO_Schema_Registry $schema Registry.
	 * @return void
	 */
	private static function register_order_fields( $schema ): void {
		$schema->register_many(
			self::PROVIDER,
			array(
				array(
					'post_type' => 'shop_order',
					'meta_key'  => '_order_total',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NOT NULL DEFAULT 0',
					'column'    => '_order_total',
					'indexed'   => true,
				),
				array(
					'post_type' => 'shop_order',
					'meta_key'  => '_order_currency',
					'zone'      => 'hot',
					'data_type' => "varchar(8) NOT NULL DEFAULT ''",
					'column'    => '_order_currency',
				),
				array(
					'post_type' => 'shop_order',
					'meta_key'  => '_billing_email',
					'zone'      => 'hot',
					'data_type' => "varchar(254) NOT NULL DEFAULT ''",
					'column'    => '_billing_email',
					'indexed'   => true,
				),
				array(
					'post_type' => 'shop_order',
					'meta_key'  => '_payment_method',
					'zone'      => 'hot',
					'data_type' => "varchar(60) NOT NULL DEFAULT ''",
					'column'    => '_payment_method',
					'indexed'   => true,
				),
				array(
					'post_type' => 'shop_order',
					'meta_key'  => '_customer_user',
					'zone'      => 'hot',
					'data_type' => 'bigint(20) NOT NULL DEFAULT 0',
					'column'    => '_customer_user',
					'indexed'   => true,
				),
			)
		);
	}

	/**
	 * Customer usermeta hot fields — registered to Entity_Registry so Hook Bus can
	 * route them to `wp_wpdo_user_hot` once `entity_user` mode advances past `disabled`.
	 *
	 * Replaces the v2.1.5 `register_customer_fields()` which targeted Schema_Registry
	 * (zone-based, no user interceptor) — that path was inert. See
	 * PLAN-entity-user-cutover.md for the migration playbook.
	 *
	 * Type mapping (Entity_Registry uses fixed-precision DECIMAL(18,6) / BIGINT(20),
	 * which is a superset of the prior `decimal(15,4)` / `bigint(20)` declarations —
	 * no precision loss):
	 *   - _money_spent  → decimal (DECIMAL(18,6))
	 *   - _order_count  → integer (BIGINT(20))
	 *   - _last_order   → integer (BIGINT(20))
	 *
	 * @return void
	 */
	public static function register_user_entity_fields(): void {
		if ( ! class_exists( 'TMDO_Entity_Registry' ) ) {
			return;
		}
		TMDO_Entity_Registry::register_group(
			'user',
			'hot',
			array(
				array(
					'key'        => '_money_spent',
					'type'       => 'decimal',
					'searchable' => true,
					'label'      => 'WC customer cumulative spend',
				),
				array(
					'key'        => '_order_count',
					'type'       => 'integer',
					'searchable' => true,
					'label'      => 'WC customer order count',
				),
				array(
					'key'   => '_last_order',
					'type'  => 'integer',
					'label' => 'WC customer last order ID',
				),
				// WC runtime stats — written on order/session events, high-frequency
				// on busy stores. Unregistered they land back in wp_usermeta.
				array(
					'key'   => 'wc_last_active',
					'type'  => 'integer',
					'label' => 'WC last customer activity timestamp (Unix)',
				),
				array(
					// WooCommerce stores this per-site via Users::update_site_user_meta(),
					// which appends the de-suffixed blog prefix ('wc_order_count' + '_wp'
					// on the main site, '_wp_2' on a subsite). Compute it the same way
					// rather than hardcoding the main-site form.
					'key'   => 'wc_order_count_' . rtrim( $GLOBALS['wpdb']->get_blog_prefix(), '_' ),
					'type'  => 'integer',
					'label' => 'WC order count for the current site (blog-aware key)',
				),
				array(
					'key'   => 'last_update',
					'type'  => 'integer',
					'label' => 'WC customer last profile update timestamp (Unix)',
				),
			)
		);
	}

	/**
	 * Subscription product fields (wc-subscriptions or wc-linepay-subscription).
	 *
	 * @param TMDO_Schema_Registry $schema Registry.
	 * @return void
	 */
	private static function register_subscription_fields( $schema ): void {
		$schema->register_many(
			self::PROVIDER,
			array(
				array(
					'post_type' => 'product',
					'meta_key'  => '_subscription_price',
					'zone'      => 'hot',
					'data_type' => 'decimal(15,4) NULL',
					'column'    => '_subscription_price',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_subscription_period',
					'zone'      => 'hot',
					'data_type' => 'varchar(20) NULL',
					'column'    => '_subscription_period',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_subscription_period_interval',
					'zone'      => 'hot',
					'data_type' => 'int(11) NULL',
					'column'    => '_subscription_period_interval',
				),
				array(
					'post_type' => 'product',
					'meta_key'  => '_subscription_length',
					'zone'      => 'hot',
					'data_type' => 'int(11) NULL',
					'column'    => '_subscription_length',
				),
			)
		);
	}

	/**
	 * Subscription extension detection — WC native or wc-linepay-subscription.
	 *
	 * @return bool
	 */
	private static function has_subscriptions(): bool {
		return class_exists( 'WC_Subscriptions' )
			|| defined( 'WCS_INIT_TIMESTAMP' )
			|| file_exists( WP_PLUGIN_DIR . '/wc-linepay-subscription/wc-linepay-subscription.php' );
	}

	/**
	 * WPDO doctor probe for any wc_* table — verifies existence + reports row count.
	 *
	 * @param string $table_suffix Suffix without prefix.
	 * @return array{ok:bool, message:string}
	 */
	public static function doctor_check( string $table_suffix ): array {
		global $wpdb;
		$full   = $wpdb->prefix . $table_suffix;
		$exists = (bool) $wpdb->get_var( // phpcs:ignore WordPress.DB.DirectDatabaseQuery,WordPress.DB.DirectDatabaseQuery.NoCaching
			$wpdb->prepare( 'SHOW TABLES LIKE %s', $full )
		);
		if ( ! $exists ) {
			$is_hpos_table = in_array( $table_suffix, array( 'wc_orders', 'wc_orders_meta', 'wc_order_addresses', 'wc_order_operational_data' ), true );
			$msg           = $is_hpos_table
				? "{$full} 不存在 — HPOS 尚未啟用或 WC 版本 < 8.2。"
				: "{$full} 不存在 — 請確認 WooCommerce 已啟用。";
			return array(
				'ok'      => false,
				'message' => $msg,
			);
		}
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery,WordPress.DB.DirectDatabaseQuery.NoCaching,WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$count = (int) $wpdb->get_var( "SELECT COUNT(*) FROM `{$full}`" );
		return array(
			'ok'      => true,
			'message' => "{$full}: {$count} rows",
		);
	}
}