<?php

namespace DgoraWcas;

// Exit if accessed directly
if ( !defined( 'ABSPATH' ) ) {
    exit;
}
class ProductVariation extends Product {
    /**
     * @var bool|false|\WC_Product_Variation|null
     */
    protected $wcProduct = null;

    public function __construct( $product ) {
        if ( !empty( $product ) && is_object( $product ) && is_a( $product, 'WC_Product_Variation' ) ) {
            $this->productID = $product->get_id();
            $this->wcProduct = $product;
        }
        if ( !empty( $product ) && is_object( $product ) && is_a( $product, 'WP_Post' ) ) {
            $this->productID = absint( $product->ID );
            $this->wcProduct = wc_get_product( $product );
        }
        if ( is_numeric( $product ) && 'product_variation' === get_post_type( $product ) ) {
            $this->productID = absint( $product );
            $this->wcProduct = wc_get_product( $product );
        }
        $this->setLanguage();
    }

    /**
     * Get parent product ID
     *
     * @return int
     */
    public function getParentID() {
        return $this->wcProduct->get_parent_id();
    }

    /**
     * Get parent product SKU
     *
     * @return string
     */
    public function getParentSKU() {
        $parentData = $this->wcProduct->get_parent_data();
        return ( isset( $parentData['sku'] ) ? $parentData['sku'] : '' );
    }

    /**
     * WooCommerce raw product object
     *
     * @return \WC_Product_Variation
     */
    public function getWooObject() {
        return $this->wcProduct;
    }

    /**
     * Check, if class is initialized correctly
     *
     * @return bool
     */
    public function isValid() {
        $isValid = false;
        if ( is_a( $this->wcProduct, 'WC_Product_Variation' ) ) {
            $isValid = true;
        }
        return $isValid;
    }

    /**
     * Determine whether the current user can access variation details in the details panel.
     *
     * Public users can only access variations that are visible and belong to a parent product
     * published and visible in catalog/search.
     *
     * @param bool $checkStockStatus Whether to respect the "exclude out of stock" setting for the variation.
     * @param string $context Method call context.
     *
     * @return bool
     */
    public function canUserSee( bool $checkStockStatus = true, string $context = '' ) : bool {
        if ( !$this->isValid() ) {
            return false;
        }
        $variation = $this->getWooObject();
        $variationId = $this->getID();
        $parentId = $this->getParentID();
        if ( empty( $parentId ) ) {
            return false;
        }
        $parent = new Product($parentId);
        if ( !$parent->isValid() ) {
            return false;
        }
        // Let authorized users preview details regardless of public visibility.
        if ( current_user_can( 'edit_post', $parentId ) || current_user_can( 'edit_post', $variationId ) ) {
            return (bool) apply_filters(
                'dgwt/wcas/product_variation/can_show_in_details_panel',
                true,
                $this,
                $parent
            );
        }
        // Delegate parent visibility/permissions; stock is checked on the variation level.
        $canShow = $parent->canUserSee( false, $context );
        if ( $canShow ) {
            // Variation must be enabled/visible for public users.
            if ( !$variation->variation_is_visible() ) {
                $canShow = false;
            }
            // Respect "exclude out of stock" setting for public users (variation-level).
            if ( $canShow && DGWT_WCAS()->settings->getOption( 'exclude_out_of_stock' ) === 'on' && !$variation->is_in_stock() ) {
                $canShow = false;
            }
        }
        return (bool) apply_filters(
            'dgwt/wcas/product_variation/can_show_in_details_panel',
            $canShow,
            $this,
            $parent
        );
    }

    /**
     * Prepare attributes for display
     *
     * @return array
     */
    public function getVariationAttributes() {
        $formattedAttributes = [];
        $attributes = $this->wcProduct->get_variation_attributes();
        if ( !empty( $attributes ) && is_array( $attributes ) ) {
            foreach ( $attributes as $key => $termSlug ) {
                if ( strpos( $key, 'attribute_' ) !== false ) {
                    $taxonomy = str_replace( 'attribute_', '', $key );
                    $term = get_term_by( 'slug', $termSlug, $taxonomy );
                    if ( !empty( $term ) && is_object( $term ) && is_a( $term, 'WP_Term' ) ) {
                        $attributeLabel = wc_attribute_label( $taxonomy );
                        $formattedAttributes[] = [
                            'label' => $attributeLabel,
                            'value' => $term->name,
                        ];
                    }
                }
            }
        }
        return apply_filters( 'dgwt/wcas/product/variation_attributes', $formattedAttributes );
    }

    /**
     * Set info about product language
     *
     * For variation we use language of parent product
     *
     * @return void
     */
    public function setLanguage() {
        if ( !$this->isValid() ) {
            return;
        }
        $this->langCode = Multilingual::getPostLang( $this->getParentID() );
    }

}