<?php

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

class AIEO_Need_Attribute {

	const DEFAULT_TAXONOMY = 'pa_need';

	
	const FAILED_TRANSIENT = 'aieo_need_attribute_failed';

	
	public static function taxonomy() {
		$tax = sanitize_key( trim( (string) get_option( 'aieo_core_attribute_need', self::DEFAULT_TAXONOMY ) ) );
		return '' === $tax ? self::DEFAULT_TAXONOMY : $tax;
	}

	
	public static function register() {
		if ( ! is_admin() ) {
			return;
		}
		add_action( 'admin_init', array( __CLASS__, 'self_heal' ), 5 );
	}

	
	public static function activate() {
		self::ensure();
	}

	
	public static function self_heal() {
		if ( ! function_exists( 'wc_create_attribute' ) ) {
			return;
		}
		$tax = self::taxonomy();
		if ( taxonomy_exists( $tax ) ) {
			return;
		}
		$failed = get_transient( self::FAILED_TRANSIENT );
		if ( is_array( $failed ) && isset( $failed['taxonomy'] ) && $failed['taxonomy'] === $tax ) {
			return;
		}
		self::ensure( $tax );
	}

	
	public static function ensure( $taxonomy = null ) {
		$tax = null === $taxonomy ? self::taxonomy() : sanitize_key( (string) $taxonomy );
		if ( ! function_exists( 'wc_create_attribute' ) || ! function_exists( 'wc_attribute_taxonomy_id_by_name' ) ) {
			return 'no-woocommerce';
		}
		if ( 0 !== strpos( $tax, 'pa_' ) || strlen( $tax ) <= 3 ) {
			return 'not-an-attribute';
		}
		$slug = substr( $tax, 3 );
		if ( taxonomy_exists( $tax ) || wc_attribute_taxonomy_id_by_name( $slug ) > 0 ) {
			return 'present';
		}
		$result = wc_create_attribute(
			array(
				'name'         => self::label( $slug ),
				'slug'         => $slug,
				'type'         => 'select',
				'order_by'     => 'menu_order',
				'has_archives' => false,
			)
		);
		if ( is_wp_error( $result ) ) {
			set_transient(
				self::FAILED_TRANSIENT,
				array(
					'taxonomy' => $tax,
					'error'    => $result->get_error_message(),
				),
				12 * HOUR_IN_SECONDS
			);
			return 'failed';
		}
		delete_transient( self::FAILED_TRANSIENT );
		
		return 'created';
	}

	
	public static function last_error() {
		$failed = get_transient( self::FAILED_TRANSIENT );
		return is_array( $failed ) && isset( $failed['error'] ) ? (string) $failed['error'] : '';
	}

	
	private static function label( $slug ) {
		if ( 'need' === $slug ) {
			return __( 'Need', 'ai-eshop-optimizer' );
		}
		return ucwords( str_replace( array( '-', '_' ), ' ', $slug ) );
	}
}