<?php
/**
 * WooCommerce Product Synchronization.
 *
 * Synchronizes rooms with WooCommerce products.
 *
 * @package Magdev\WpBnb\Integration\WooCommerce
 */

declare( strict_types=1 );

namespace Magdev\WpBnb\Integration\WooCommerce;

use Magdev\WpBnb\PostTypes\Building;
use Magdev\WpBnb\PostTypes\Room;
use Magdev\WpBnb\Pricing\Calculator;
use Magdev\WpBnb\Pricing\PricingTier;
use Magdev\WpBnb\Taxonomies\Amenity;
use Magdev\WpBnb\Taxonomies\RoomType;

/**
 * Product Synchronization class.
 *
 * Creates and maintains WooCommerce products that correspond to BnB rooms.
 */
final class ProductSync {

	/**
	 * Initialize product synchronization.
	 *
	 * @return void
	 */
	public static function init(): void {
		// Sync product when room is saved.
		add_action( 'save_post_' . Room::POST_TYPE, array( self::class, 'on_room_save' ), 20, 2 );

		// Delete product when room is deleted.
		add_action( 'before_delete_post', array( self::class, 'on_room_delete' ) );

		// Add linked room info to product edit screen.
		add_action( 'woocommerce_product_options_general_product_data', array( self::class, 'add_product_room_info' ) );

		// AJAX handler for syncing all rooms.
		add_action( 'wp_ajax_wp_bnb_sync_all_rooms', array( self::class, 'ajax_sync_all_rooms' ) );
	}

	/**
	 * Handle room save - create or update product.
	 *
	 * @param int      $post_id Post ID.
	 * @param \WP_Post $post    Post object.
	 * @return void
	 */
	public static function on_room_save( int $post_id, \WP_Post $post ): void {
		// Skip autosaves, revisions, and other non-published posts.
		if ( wp_is_post_autosave( $post_id ) || wp_is_post_revision( $post_id ) ) {
			return;
		}

		if ( 'publish' !== $post->post_status ) {
			return;
		}

		// Check if auto-sync is enabled.
		if ( ! Manager::is_auto_sync_enabled() ) {
			return;
		}

		// Sync the product.
		self::sync_room_to_product( $post_id );
	}

	/**
	 * Handle room deletion - delete linked product.
	 *
	 * @param int $post_id Post ID.
	 * @return void
	 */
	public static function on_room_delete( int $post_id ): void {
		$post = get_post( $post_id );

		if ( ! $post || Room::POST_TYPE !== $post->post_type ) {
			return;
		}

		self::delete_product_for_room( $post_id );
	}

	/**
	 * Sync a room to a WooCommerce product.
	 *
	 * Creates a new product if one doesn't exist, or updates existing one.
	 *
	 * @param int $room_id Room post ID.
	 * @return int|null Product ID or null on failure.
	 */
	public static function sync_room_to_product( int $room_id ): ?int {
		$room = get_post( $room_id );

		if ( ! $room || Room::POST_TYPE !== $room->post_type ) {
			return null;
		}

		// Check for existing product.
		$product_id = self::get_product_for_room( $room_id );

		if ( $product_id ) {
			// Update existing product.
			return self::update_product( $product_id, $room );
		}

		// Create new product.
		return self::create_product_for_room( $room );
	}

	/**
	 * Create a WooCommerce product for a room.
	 *
	 * @param \WP_Post $room Room post object.
	 * @return int|null Product ID or null on failure.
	 */
	public static function create_product_for_room( \WP_Post $room ): ?int {
		/**
		 * Fires before creating a WC product for a room.
		 *
		 * @param int $room_id Room post ID.
		 */
		do_action( 'wp_bnb_wc_before_product_sync', $room->ID );

		// Create a simple virtual product.
		$product = new \WC_Product_Simple();

		// Configure the product.
		self::configure_product( $product, $room );

		// Save the product.
		$product_id = $product->save();

		if ( ! $product_id ) {
			return null;
		}

		// Store bidirectional links.
		update_post_meta( $room->ID, Manager::ROOM_PRODUCT_META, $product_id );
		update_post_meta( $product_id, Manager::PRODUCT_ROOM_META, $room->ID );

		/**
		 * Fires after creating a WC product for a room.
		 *
		 * @param int $room_id    Room post ID.
		 * @param int $product_id WC product ID.
		 */
		do_action( 'wp_bnb_wc_after_product_sync', $room->ID, $product_id );

		return $product_id;
	}

	/**
	 * Update an existing WooCommerce product.
	 *
	 * @param int      $product_id Product ID.
	 * @param \WP_Post $room       Room post object.
	 * @return int|null Product ID or null on failure.
	 */
	private static function update_product( int $product_id, \WP_Post $room ): ?int {
		$product = wc_get_product( $product_id );

		if ( ! $product ) {
			// Product was deleted, create a new one.
			return self::create_product_for_room( $room );
		}

		/**
		 * Fires before updating a WC product for a room.
		 *
		 * @param int $room_id Room post ID.
		 */
		do_action( 'wp_bnb_wc_before_product_sync', $room->ID );

		// Configure the product.
		self::configure_product( $product, $room );

		// Save the product.
		$product->save();

		/**
		 * Fires after updating a WC product for a room.
		 *
		 * @param int $room_id    Room post ID.
		 * @param int $product_id WC product ID.
		 */
		do_action( 'wp_bnb_wc_after_product_sync', $room->ID, $product_id );

		return $product_id;
	}

	/**
	 * Configure a WooCommerce product from room data.
	 *
	 * @param \WC_Product $product Product object.
	 * @param \WP_Post    $room    Room post object.
	 * @return void
	 */
	private static function configure_product( \WC_Product $product, \WP_Post $room ): void {
		// Get room data.
		$building     = Room::get_building( $room->ID );
		$building_name = $building ? $building->post_title : '';
		$pricing      = Calculator::getRoomPricing( $room->ID );

		// Basic info.
		$product->set_name( $room->post_title );
		$product->set_slug( 'bnb-room-' . $room->ID );
		$product->set_status( 'publish' );

		// SKU.
		$product->set_sku( 'bnb-room-' . $room->ID );

		// Virtual product (no shipping).
		$product->set_virtual( true );

		// Description.
		$description = $room->post_content;
		if ( $building_name ) {
			$description = sprintf(
				/* translators: %s: Building name */
				__( 'Room at %s', 'wp-bnb' ),
				$building_name
			) . "\n\n" . $description;
		}
		$product->set_description( $description );
		$product->set_short_description( $room->post_excerpt ?: wp_trim_words( $room->post_content, 30 ) );

		// Price (use short-term/nightly rate as base).
		$base_price = $pricing[ PricingTier::SHORT_TERM->value ]['price'] ?? 0;
		if ( $base_price > 0 ) {
			$product->set_regular_price( (string) $base_price );
		}

		// Featured image.
		$thumbnail_id = get_post_thumbnail_id( $room->ID );
		if ( $thumbnail_id ) {
			$product->set_image_id( $thumbnail_id );
		}

		// Gallery images.
		$gallery_ids = get_post_meta( $room->ID, '_bnb_room_gallery', true );
		if ( $gallery_ids ) {
			$ids = array_filter( explode( ',', $gallery_ids ), 'is_numeric' );
			$product->set_gallery_image_ids( array_map( 'absint', $ids ) );
		}

		// Stock management (disabled - availability handled by booking system).
		$product->set_manage_stock( false );
		$product->set_stock_status( 'instock' );

		// Catalog visibility - visible.
		$product->set_catalog_visibility( 'visible' );

		// Product category.
		$category_id = Manager::get_product_category();
		if ( $category_id ) {
			$product->set_category_ids( array( $category_id ) );
		}

		// Store room metadata.
		$capacity = get_post_meta( $room->ID, '_bnb_room_capacity', true );
		$beds     = get_post_meta( $room->ID, '_bnb_room_beds', true );

		$product->update_meta_data( '_bnb_room_capacity', $capacity );
		$product->update_meta_data( '_bnb_room_beds', $beds );
		$product->update_meta_data( '_bnb_building_id', $building ? $building->ID : 0 );
		$product->update_meta_data( '_bnb_building_name', $building_name );

		/**
		 * Filter the product data before save.
		 *
		 * @param array    $data    Product data array.
		 * @param int      $room_id Room post ID.
		 * @param \WP_Post $room    Room post object.
		 */
		$data = apply_filters(
			'wp_bnb_wc_product_data',
			array(
				'name'        => $product->get_name(),
				'price'       => $product->get_regular_price(),
				'description' => $product->get_description(),
			),
			$room->ID,
			$room
		);

		// Apply filtered data.
		if ( isset( $data['name'] ) ) {
			$product->set_name( $data['name'] );
		}
		if ( isset( $data['price'] ) ) {
			$product->set_regular_price( (string) $data['price'] );
		}
		if ( isset( $data['description'] ) ) {
			$product->set_description( $data['description'] );
		}
	}

	/**
	 * Delete the WooCommerce product for a room.
	 *
	 * @param int $room_id Room post ID.
	 * @return bool True if deleted, false otherwise.
	 */
	public static function delete_product_for_room( int $room_id ): bool {
		$product_id = self::get_product_for_room( $room_id );

		if ( ! $product_id ) {
			return false;
		}

		$product = wc_get_product( $product_id );

		if ( ! $product ) {
			return false;
		}

		// Delete the product (force delete, not trash).
		$product->delete( true );

		// Clean up room meta.
		delete_post_meta( $room_id, Manager::ROOM_PRODUCT_META );

		return true;
	}

	/**
	 * Get the WooCommerce product ID for a room.
	 *
	 * @param int $room_id Room post ID.
	 * @return int|null Product ID or null.
	 */
	public static function get_product_for_room( int $room_id ): ?int {
		$product_id = get_post_meta( $room_id, Manager::ROOM_PRODUCT_META, true );

		if ( ! $product_id ) {
			return null;
		}

		// Verify product still exists.
		$product = wc_get_product( $product_id );

		if ( ! $product ) {
			// Clean up stale meta.
			delete_post_meta( $room_id, Manager::ROOM_PRODUCT_META );
			return null;
		}

		return absint( $product_id );
	}

	/**
	 * Get the room ID for a WooCommerce product.
	 *
	 * @param int $product_id Product ID.
	 * @return int|null Room ID or null.
	 */
	public static function get_room_for_product( int $product_id ): ?int {
		$room_id = get_post_meta( $product_id, Manager::PRODUCT_ROOM_META, true );

		if ( ! $room_id ) {
			return null;
		}

		// Verify room still exists.
		$room = get_post( $room_id );

		if ( ! $room || Room::POST_TYPE !== $room->post_type ) {
			// Clean up stale meta.
			delete_post_meta( $product_id, Manager::PRODUCT_ROOM_META );
			return null;
		}

		return absint( $room_id );
	}

	/**
	 * Sync all published rooms to WooCommerce products.
	 *
	 * @return array{created: int, updated: int, errors: array<string>}
	 */
	public static function sync_all_rooms(): array {
		$result = array(
			'created' => 0,
			'updated' => 0,
			'errors'  => array(),
		);

		$rooms = get_posts(
			array(
				'post_type'      => Room::POST_TYPE,
				'post_status'    => 'publish',
				'posts_per_page' => -1,
				'fields'         => 'ids',
			)
		);

		foreach ( $rooms as $room_id ) {
			$existing_product = self::get_product_for_room( $room_id );

			$product_id = self::sync_room_to_product( $room_id );

			if ( $product_id ) {
				if ( $existing_product ) {
					++$result['updated'];
				} else {
					++$result['created'];
				}
			} else {
				$room = get_post( $room_id );
				$result['errors'][] = sprintf(
					/* translators: %s: Room title */
					__( 'Failed to sync room: %s', 'wp-bnb' ),
					$room ? $room->post_title : "#{$room_id}"
				);
			}
		}

		return $result;
	}

	/**
	 * AJAX handler for syncing all rooms.
	 *
	 * @return void
	 */
	public static function ajax_sync_all_rooms(): void {
		check_ajax_referer( 'wp_bnb_admin_nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( array( 'message' => __( 'Permission denied.', 'wp-bnb' ) ) );
		}

		$result = self::sync_all_rooms();

		wp_send_json_success(
			array(
				'message' => sprintf(
					/* translators: 1: Created count, 2: Updated count */
					__( 'Sync complete. Created: %1$d, Updated: %2$d', 'wp-bnb' ),
					$result['created'],
					$result['updated']
				),
				'created' => $result['created'],
				'updated' => $result['updated'],
				'errors'  => $result['errors'],
			)
		);
	}

	/**
	 * Add linked room info to WooCommerce product edit screen.
	 *
	 * @return void
	 */
	public static function add_product_room_info(): void {
		global $post;

		if ( ! $post ) {
			return;
		}

		$room_id = self::get_room_for_product( $post->ID );

		if ( ! $room_id ) {
			return;
		}

		$room = get_post( $room_id );

		if ( ! $room ) {
			return;
		}

		?>
		<div class="options_group show_if_simple">
			<p class="form-field">
				<label><?php esc_html_e( 'Linked BnB Room', 'wp-bnb' ); ?></label>
				<span class="description">
					<a href="<?php echo esc_url( get_edit_post_link( $room_id ) ); ?>">
						<?php echo esc_html( $room->post_title ); ?>
					</a>
					<br>
					<small><?php esc_html_e( 'This product is automatically synced from the linked room. Changes should be made in the room settings.', 'wp-bnb' ); ?></small>
				</span>
			</p>
		</div>
		<?php
	}

	/**
	 * Check if a product is a BnB room product.
	 *
	 * @param int|\WC_Product $product Product ID or object.
	 * @return bool
	 */
	public static function is_room_product( $product ): bool {
		if ( is_int( $product ) ) {
			$product = wc_get_product( $product );
		}

		if ( ! $product instanceof \WC_Product ) {
			return false;
		}

		$room_id = $product->get_meta( Manager::PRODUCT_ROOM_META, true );

		return ! empty( $room_id );
	}
}