<?php
/**
 * The attribute rules of every mapped marketplace category (for one account). Pure PHP.
 *
 * @package Tidelist
 */

namespace Tidelist\Mapping;

/**
 * Marketplace category => attribute code => rule.
 */
final class AttributeMap {

	/**
	 * Rules as arrays: category ID => attribute code => rule data.
	 *
	 * @var array<int, array<string, array>>
	 */
	private $rules = array();

	/**
	 * Constructor.
	 *
	 * @param array $rules Category ID => attribute code => rule data.
	 */
	public function __construct( array $rules = array() ) {
		foreach ( $rules as $category => $by_code ) {
			foreach ( (array) $by_code as $code => $data ) {
				$this->set_rule( (int) $category, (string) $code, new AttributeRule( (array) $data ) );
			}
		}
	}

	/**
	 * The rules of one channel (or account) out of the stored setting (key => rules).
	 *
	 * @param array      $setting Stored setting.
	 * @param int|string $key     Channel ID, or an account ID.
	 */
	public static function from_setting( array $setting, $key = 0 ): self {
		return new self( (array) ( $setting[ $key ] ?? $setting[ (string) $key ] ?? array() ) );
	}

	/**
	 * The stored setting with this map for one channel (or account).
	 *
	 * @param array      $setting Stored setting.
	 * @param int|string $key     Channel ID, or an account ID.
	 */
	public function to_setting( array $setting, $key = 0 ): array {
		$setting[ $key ] = $this->rules;
		return $setting;
	}

	/**
	 * Sets a rule.
	 *
	 * @param int           $category_id marketplace category ID.
	 * @param string        $code        marketplace attribute code.
	 * @param AttributeRule $rule        Rule.
	 */
	public function set_rule( int $category_id, string $code, AttributeRule $rule ): void {
		if ( $category_id > 0 && '' !== $code ) {
			$this->rules[ $category_id ][ $code ] = $rule->to_array();
		}
	}

	/**
	 * Removes all rules of a category.
	 *
	 * @param int $category_id marketplace category ID.
	 */
	public function clear_category( int $category_id ): void {
		unset( $this->rules[ $category_id ] );
	}

	/**
	 * Whether a category has any rules.
	 *
	 * @param int $category_id marketplace category ID.
	 */
	public function has_category( int $category_id ): bool {
		return ! empty( $this->rules[ $category_id ] );
	}

	/**
	 * One rule.
	 *
	 * @param int    $category_id marketplace category ID.
	 * @param string $code        Attribute code.
	 */
	public function rule( int $category_id, string $code ): ?AttributeRule {
		return isset( $this->rules[ $category_id ][ $code ] ) ? new AttributeRule( $this->rules[ $category_id ][ $code ] ) : null;
	}

	/**
	 * All rules of a category.
	 *
	 * @param int $category_id marketplace category ID.
	 * @return array<string, AttributeRule>
	 */
	public function rules_for( int $category_id ): array {
		$out = array();
		foreach ( (array) ( $this->rules[ $category_id ] ?? array() ) as $code => $data ) {
			$out[ (string) $code ] = new AttributeRule( $data );
		}
		return $out;
	}
}