<?php
declare( strict_types = 1);
namespace Automattic\WooCommerce\Blocks\BlockTypes;

use Automattic\WooCommerce\Blocks\BlockTypes\ProductCollection\Utils as ProductCollectionUtils;
use Automattic\WooCommerce\Blocks\QueryFilters;
use Automattic\WooCommerce\Blocks\Package;

/**
 * Product Filter: Status Block.
 */
final class ProductFilterStatus extends AbstractBlock {

	/**
	 * Block name.
	 *
	 * @var string
	 */
	protected $block_name = 'product-filter-status';

	const STOCK_STATUS_QUERY_VAR = 'filter_stock_status';

	/**
	 * Initialize this block type.
	 *
	 * - Hook into WP lifecycle.
	 * - Register the block with WordPress.
	 */
	protected function initialize() {
		parent::initialize();

		add_filter( 'woocommerce_blocks_product_filters_param_keys', array( $this, 'get_filter_query_param_keys' ), 10, 2 );
		add_filter( 'woocommerce_blocks_product_filters_selected_items', array( $this, 'prepare_selected_filters' ), 10, 2 );
	}

	/**
	 * Register the query param keys.
	 *
	 * @param array $filter_param_keys The active filters data.
	 * @param array $url_param_keys    The query param parsed from the URL.
	 *
	 * @return array Active filters param keys.
	 */
	public function get_filter_query_param_keys( $filter_param_keys, $url_param_keys ) {
		$stock_param_keys = array_filter(
			$url_param_keys,
			function ( $param ) {
				return self::STOCK_STATUS_QUERY_VAR === $param;
			}
		);

		return array_merge(
			$filter_param_keys,
			$stock_param_keys
		);
	}

	/**
	 * Prepare the active filter items.
	 *
	 * @param array $items  The active filter items.
	 * @param array $params The query param parsed from the URL.
	 * @return array Active filters items.
	 */
	public function prepare_selected_filters( $items, $params ) {
		$status_options = array_merge(
			wc_get_product_stock_status_options(),
			// On sale and Featured status are declared here.
			array()
		);

		if ( empty( $params[ self::STOCK_STATUS_QUERY_VAR ] ) ) {
			return $items;
		}

		$active_statuses = array_filter(
			explode( ',', $params[ self::STOCK_STATUS_QUERY_VAR ] )
		);

		if ( empty( $active_statuses ) ) {
			return $items;
		}

		$action_namespace = $this->get_full_block_name();

		foreach ( $active_statuses as $status ) {
			$items[] = array(
				'type'  => 'status',
				'value' => $status,
				// translators: %s: status.
				'label' => sprintf( __( 'Status: %s', 'woocommerce' ), $status_options[ $status ] ),
			);
		}

		return $items;
	}

	/**
	 * Extra data passed through from server to client for block.
	 *
	 * @param array $stock_statuses  Any stock statuses that currently are available from the block.
	 *                               Note, this will be empty in the editor context when the block is
	 *                               not in the post content on editor load.
	 */
	protected function enqueue_data( array $stock_statuses = array() ) {
		parent::enqueue_data( $stock_statuses );
		$this->asset_data_registry->add( 'stockStatusOptions', wc_get_product_stock_status_options() );
		$this->asset_data_registry->add( 'hideOutOfStockItems', 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) );
	}

	/**
	 * Include and render the block.
	 *
	 * @param array    $attributes Block attributes. Default empty array.
	 * @param string   $content    Block content. Default empty string.
	 * @param WP_Block $block      Block instance.
	 * @return string Rendered block type output.
	 */
	protected function render( $attributes, $content, $block ) {
		// don't render if its admin, or ajax in progress.
		if ( is_admin() || wp_doing_ajax() ) {
			return '';
		}

		$stock_status_data       = $this->get_stock_status_counts( $block );
		$stock_statuses          = wc_get_product_stock_status_options();
		$filter_params           = $block->context['filterParams'] ?? array();
		$query                   = $filter_params[ self::STOCK_STATUS_QUERY_VAR ] ?? '';
		$selected_stock_statuses = array_filter( explode( ',', $query ) );

		$filter_options = array_map(
			function ( $item ) use ( $stock_statuses, $selected_stock_statuses, $attributes ) {
				$label = $stock_statuses[ $item['status'] ] . ( $attributes['showCounts'] ? ' (' . $item['count'] . ')' : '' );
				return array(
					'label'     => $label,
					'ariaLabel' => $label,
					'value'     => $item['status'],
					'selected'  => in_array( $item['status'], $selected_stock_statuses, true ),
					'type'      => 'status',
					'data'      => $item,
				);
			},
			$stock_status_data
		);

		$filter_context = array(
			'items'  => array_values( $filter_options ),
			'parent' => $this->get_full_block_name(),
		);

		$wrapper_attributes = array(
			'data-wc-interactive'  => wp_json_encode( array( 'namespace' => $this->get_full_block_name() ), JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP ),
			'data-wc-context'      => wp_json_encode(
				array(
					'hasFilterOptions'    => ! empty( $filter_options ),
					/* translators: {{label}} is the status filter item label. */
					'activeLabelTemplate' => __( 'Status: {{label}}', 'woocommerce' ),
				),
				JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
			),
			'data-wc-bind--hidden' => '!context.hasFilterOptions',
		);

		if ( empty( $filter_options ) ) {
			$wrapper_attributes['hidden'] = true;
		}

		return sprintf(
			'<div %1$s>%2$s</div>',
			get_block_wrapper_attributes(
				$wrapper_attributes
			),
			array_reduce(
				$block->parsed_block['innerBlocks'],
				function ( $carry, $parsed_block ) use ( $filter_context ) {
					$carry .= ( new \WP_Block( $parsed_block, array( 'filterData' => $filter_context ) ) )->render();
					return $carry;
				},
				''
			)
		);
	}

	/**
	 * Retrieve the status filter data for current block.
	 *
	 * @param WP_Block $block Block instance.
	 */
	private function get_stock_status_counts( $block ) {
		$filters    = Package::container()->get( QueryFilters::class );
		$query_vars = ProductCollectionUtils::get_query_vars( $block, 1 );

		unset(
			$query_vars['filter_stock_status'],
		);

		if ( isset( $query_vars['taxonomy'] ) && false !== strpos( $query_vars['taxonomy'], 'pa_' ) ) {
			unset(
				$query_vars['taxonomy'],
				$query_vars['term']
			);
		}

		if ( ! empty( $query_vars['meta_query'] ) ) {
			// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query
			$query_vars['meta_query'] = ProductCollectionUtils::remove_query_array( $query_vars['meta_query'], 'key', '_stock_status' );
		}

		$counts = $filters->get_stock_status_counts( $query_vars );
		$data   = array();

		foreach ( $counts as $key => $value ) {
			$data[] = array(
				'status' => $key,
				'count'  => $value,
			);
		}

		return array_filter(
			$data,
			function ( $stock_count ) {
				return $stock_count['count'] > 0;
			}
		);
	}
}
