<?php
/**
 * Ensure only one cost UI surface is visible for the active canonical source.
 *
 * @package Kayvandra\MarginBeacon
 */

declare(strict_types=1);

namespace Kayvandra\MarginBeacon\Admin\Cost;

use Kayvandra\MarginBeacon\Application\Cost\CanonicalCostSource;

/**
 * Prevents dual Cost fields (Woo native + MarginBeacon) from confusing merchants.
 *
 * Rules:
 * - canonical = woocommerce + native product-edit Cost UI present → hide MarginBeacon
 *   manual fields; keep Woo `_cogs_value`.
 * - canonical = woocommerce + native product-edit Cost UI absent → ProductCostFields
 *   shows a WooCommerce-store fallback (`aksmb_woo_cogs`); do not hide that fallback.
 * - canonical = marginbeacon → hide WooCommerce Cost inputs (MB Cost is primary).
 */
final class CostSourceAdminUi {

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public function register() {
		// After Woo injects its Cost column.
		add_filter( 'manage_edit-product_columns', array( $this, 'filter_product_columns' ), 100 );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_product_edit_styles' ) );
	}

	/**
	 * Keep a single Cost/COGS column on the products list.
	 *
	 * @param array $columns Columns.
	 * @return array
	 */
	public function filter_product_columns( $columns ) {
		if ( ! is_array( $columns ) ) {
			return $columns;
		}

		$canonical = new CanonicalCostSource();
		if ( $canonical->is_marginbeacon() ) {
			// Woo's native "Cost" column (cogs_value) must not sit beside MarginBeacon COGS.
			unset( $columns['cogs_value'] );
		}

		return $columns;
	}

	/**
	 * Hide the inactive store's cost inputs on product / variation edit screens.
	 *
	 * @param string $hook Admin hook.
	 * @return void
	 */
	public function enqueue_product_edit_styles( $hook ) {
		if ( ! in_array( $hook, array( 'post.php', 'post-new.php', 'edit.php' ), true ) ) {
			return;
		}
		if ( ! $this->is_product_admin_screen() ) {
			return;
		}

		$canonical = new CanonicalCostSource();
		if ( $canonical->is_woocommerce() ) {
			// MarginBeacon fields are not rendered in PHP; belt-and-suspenders for cached markup.
			$css = '
				#_aksmb_manual_cost_field,
				.form-field._aksmb_manual_cost_field,
				.woocommerce_variable_attributes input[name^="aksmb_manual_cost"] {
					display: none !important;
				}
			';
		} else {
			// Hide WooCommerce native Cost inputs while MarginBeacon is canonical.
			$css = '
				#_cogs_value_field,
				#_cogs_total_value_field,
				.form-field._cogs_value_field,
				.form-field._cogs_total_value_field,
				.woocommerce_options_panel .cogs_field,
				.woocommerce_variable_attributes .cogs_field,
				.woocommerce_variable_attributes input[name^="variable_cogs_value"],
				.woocommerce_variable_attributes input[id^="variable_cogs_value"],
				.inline-edit-row label.cogs_value,
				.inline-edit-group.cogs_value,
				.bulk-edit-product label.cogs_value {
					display: none !important;
				}
			';
		}

		wp_register_style( 'aksmb-cost-source-ui', false, array(), AKSMB_VERSION );
		wp_enqueue_style( 'aksmb-cost-source-ui' );
		wp_add_inline_style( 'aksmb-cost-source-ui', preg_replace( '/\s+/', ' ', trim( $css ) ) );
	}

	/**
	 * @return bool
	 */
	private function is_product_admin_screen() {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		if ( is_object( $screen ) ) {
			if ( isset( $screen->post_type ) && 'product' === $screen->post_type ) {
				return true;
			}
			if ( isset( $screen->id ) && in_array( (string) $screen->id, array( 'product', 'edit-product' ), true ) ) {
				return true;
			}
		}
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$post_type = isset( $_GET['post_type'] ) ? sanitize_key( wp_unslash( $_GET['post_type'] ) ) : '';
		return 'product' === $post_type;
	}
}