<?php
/**
 * Page / Post selection condition.
 *
 * @package BlockSieve
 */

namespace BlockSieve\Conditions\Definitions;

use BlockSieve\Conditions\AbstractCondition;
use BlockSieve\Conditions\Context\Context;

/**
 * Passes when the current post is one of the selected posts/pages.
 *
 * The editor selects specific items through a searchable selector (backed by the
 * REST search endpoint); their ids are stored as the condition value.
 */
final class PostSelectionCondition extends AbstractCondition {

	/**
	 * Gets the unique condition identifier.
	 *
	 * @return string
	 */
	public function id(): string {
		return 'post-selection';
	}

	/**
	 * Gets the translated human label.
	 *
	 * @return string
	 */
	public function label(): string {
		return __( 'Page / Post', 'blocksieve' );
	}

	/**
	 * Gets the translated description shown in the UI.
	 *
	 * @return string
	 */
	public function description(): string {
		return __( 'The current content is one of the selected posts or pages.', 'blocksieve' );
	}

	/**
	 * Gets the category used to group this condition in the UI.
	 *
	 * @return string
	 */
	public function category(): string {
		return 'content';
	}

	/**
	 * Gets the list of supported operator identifiers.
	 *
	 * @return string[]
	 */
	public function operators(): array {
		return array( 'is', 'is_not' );
	}

	/**
	 * Gets the JSON-schema-like description of the value field for the UI.
	 *
	 * @return array
	 */
	public function value_schema(): array {
		return array(
			'type'  => 'array',
			'items' => array( 'type' => 'integer' ),
		);
	}

	/**
	 * Gets the default value for a newly created condition of this type.
	 *
	 * @return mixed
	 */
	public function default_value() {
		return array();
	}

	/**
	 * Evaluates the condition against the given context.
	 *
	 * @param Context $context  Request context value object.
	 * @param string  $operator Operator identifier.
	 * @param mixed   $value    Configured value.
	 * @return bool
	 */
	public function evaluate( Context $context, string $operator, $value ): bool {
		// Scalars only: intval() of a non-empty nested array is 1, which would match post 1.
		$ids = array_filter( array_map( 'intval', array_filter( is_array( $value ) ? $value : array( $value ), 'is_scalar' ) ) );

		if ( 0 === $context->post_id ) {
			// No singular post context: 'is' cannot match; 'is_not' always holds.
			return 'is_not' === $operator;
		}

		$match = in_array( $context->post_id, $ids, true );

		return 'is_not' === $operator ? ! $match : $match;
	}
}