<?php
namespace Patchwork\Split;

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

/**
 * Loads the manager on the order edit and orders list screens, and shows the
 * relationship notice on split / unable orders.
 */
class Admin {

    public function __construct() {
        add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_assets' ] );
        add_action( 'admin_notices', [ $this, 'relationship_notice' ] );
    }

    public function enqueue_assets(): void {

        if ( ! Settings::current_user_can_split() ) return;

        $order_id = self::current_order_id();
        $on_list  = self::is_orders_list();
        if ( ! $order_id && ! $on_list ) return;

        wp_enqueue_style( 'patchwork-split-admin', PATCHWORK_SPLIT_URL . 'assets/css/admin.css', [], PATCHWORK_SPLIT_VERSION );
        wp_enqueue_script( 'patchwork-split-manager', PATCHWORK_SPLIT_URL . 'assets/js/manager.js', [ 'jquery', 'wp-api-fetch' ], PATCHWORK_SPLIT_VERSION, true );

        wp_localize_script( 'patchwork-split-manager', 'PatchworkSplitConfig', [
            'order_id'       => $order_id,
            'mode'           => $order_id ? 'edit' : 'list',
            'rest_path'      => '/' . REST_Controller::NS,
            'split_reasons'  => Settings::get_split_reasons(),
            'unable_reasons' => Settings::get_unable_reasons(),
            'shipping_mode'  => Settings::get_shipping_mode(),
            // [ { value, label } ] — empty unless an extension offers a choice of status for the new order
            'child_statuses' => array_values( (array) apply_filters( 'patchwork_split_child_status_options', [] ) ),
            'notify_split'   => Settings::email_on_split(),
            'notify_unable'  => Settings::email_on_unable(),
            'today'          => current_time( 'Y-m-d' ),
            'backorder_reason' => Backorders::reason(),
            // Status to pre-select when splitting backorders ('' = keep the default)
            'backorder_status' => (string) apply_filters( 'patchwork_split_backorder_child_status', '' ),
            'extensions'     => array_keys( patchwork_split_get_extensions() ),
            'i18n'           => [
                'manager_title'    => __( 'Manage order items', 'patchwork-order-split' ),
                'manager_subtitle' => __( 'Split items into a new order, or mark items you can\'t fulfil.', 'patchwork-order-split' ),
                'btn_open'         => __( 'Open manager', 'patchwork-order-split' ),
                'btn_apply'        => __( 'Apply changes', 'patchwork-order-split' ),
                'btn_close'        => __( 'Close', 'patchwork-order-split' ),
                'action_keep'      => __( 'Keep', 'patchwork-order-split' ),
                'action_keep_sub'  => __( 'Stays in this order', 'patchwork-order-split' ),
                'action_split'     => __( 'Split', 'patchwork-order-split' ),
                'action_split_sub' => __( 'Move to a new order', 'patchwork-order-split' ),
                'action_unable'    => __( 'Unable', 'patchwork-order-split' ),
                'action_unable_sub'=> __( 'Can\'t fulfil this item', 'patchwork-order-split' ),
                'label_reason'     => __( 'Reason', 'patchwork-order-split' ),
                'label_notes'      => __( 'Notes (optional)', 'patchwork-order-split' ),
                'label_qty'        => __( 'Qty', 'patchwork-order-split' ),
                'label_move_qty'   => __( 'How many', 'patchwork-order-split' ),
                'label_of'         => __( 'of', 'patchwork-order-split' ),
                'label_stays'      => __( 'stay in this order', 'patchwork-order-split' ),
                'label_date'       => __( 'New order date', 'patchwork-order-split' ),
                'label_shipping'   => __( 'Shipping', 'patchwork-order-split' ),
                'label_status'     => __( 'New order status', 'patchwork-order-split' ),
                'ship_keep'        => __( 'Keep on this order', 'patchwork-order-split' ),
                'ship_zero'        => __( 'Same method on new order, free', 'patchwork-order-split' ),
                'ship_move'        => __( 'Move to new order', 'patchwork-order-split' ),
                'label_notify'     => __( 'Email the customer', 'patchwork-order-split' ),
                'label_refund_gw'  => __( 'Refund unable items through the payment provider now', 'patchwork-order-split' ),
                'paid_unable_note' => __( 'This order is paid: Unable items will be refunded (recorded on the order).', 'patchwork-order-split' ),
                'refunded_item'    => __( 'Already refunded — can\'t be changed', 'patchwork-order-split' ),
                'os_title'         => __( 'Summary', 'patchwork-order-split' ),
                'os_current'       => __( 'This order', 'patchwork-order-split' ),
                'os_split'         => __( 'New order', 'patchwork-order-split' ),
                'os_unable'        => __( 'Unable', 'patchwork-order-split' ),
                'os_shipping'      => __( 'Shipping', 'patchwork-order-split' ),
                'os_estimate'      => __( 'Estimate incl. tax; final totals are calculated by WooCommerce.', 'patchwork-order-split' ),
                'err_no_items'     => __( 'No order items found.', 'patchwork-order-split' ),
                'err_no_changes'   => __( 'Mark at least one item as Split or Unable.', 'patchwork-order-split' ),
                'err_load'         => __( 'Could not load the order items. Open the order directly and try again.', 'patchwork-order-split' ),
                'processing'       => __( 'Applying changes…', 'patchwork-order-split' ),
                'done'             => __( 'Done.', 'patchwork-order-split' ),
                'done_child'       => __( 'New order', 'patchwork-order-split' ),
                'done_unable'      => __( 'Unable items recorded in', 'patchwork-order-split' ),
                'done_refund'      => __( 'Refund created', 'patchwork-order-split' ),
                'btn_reload'       => __( 'Reload order', 'patchwork-order-split' ),
                'loading'          => __( 'Loading…', 'patchwork-order-split' ),
            ],
        ] );
    }

    /**
     * On a split or unable order, say where it came from and how payment works.
     */
    public function relationship_notice(): void {
        $order_id = self::current_order_id();
        if ( ! $order_id ) return;

        $order = wc_get_order( $order_id );
        if ( ! $order ) return;

        $parent_id = (int) $order->get_meta( '_pwsplit_parent_id' );
        if ( ! $parent_id ) return;

        $parent = wc_get_order( $parent_id );
        $link   = $parent
            ? sprintf( '<a href="%s">#%s</a>', esc_url( $parent->get_edit_order_url() ), esc_html( $parent->get_order_number() ) )
            : '#' . (int) $parent_id;

        $type = $order->get_meta( '_pwsplit_type' );
        $msg  = $type === 'unable'
            /* translators: %s: link to the original order */
            ? sprintf( esc_html__( 'This order records items that could not be fulfilled from order %s.', 'patchwork-order-split' ), $link )
            /* translators: %s: link to the original order */
            : sprintf( esc_html__( 'This order was split from order %s.', 'patchwork-order-split' ), $link );

        if ( $order->get_meta( '_pwsplit_paid_via_parent' ) ) {
            $msg .= ' ' . esc_html__( 'It was paid as part of that order, so make any refunds from the original order.', 'patchwork-order-split' );
        }

        echo '<div class="notice notice-info"><p>' . wp_kses( $msg, [ 'a' => [ 'href' => [] ] ] ) . '</p></div>';
    }

    // ─── Screen helpers (HPOS + legacy) ───────────────────────────────────────

    /**
     * The order being edited, or 0 when not on an order edit screen.
     */
    public static function current_order_id(): int {
        $screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
        if ( ! $screen || $screen->id !== self::order_screen_id() ) return 0;

        // phpcs:disable WordPress.Security.NonceVerification.Recommended -- read-only screen detection
        if ( isset( $_GET['action'], $_GET['id'] ) && $_GET['action'] === 'edit' ) return absint( $_GET['id'] );   // HPOS
        if ( $screen->base === 'post' && isset( $_GET['post'] ) ) return absint( $_GET['post'] );                    // legacy
        // phpcs:enable
        return 0;
    }

    public static function is_orders_list(): bool {
        $screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
        if ( ! $screen ) return false;
        if ( $screen->id === 'edit-shop_order' ) return true; // legacy
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended
        return $screen->id === 'woocommerce_page_wc-orders' && ! isset( $_GET['action'] );
    }

    private static function order_screen_id(): string {
        return function_exists( 'wc_get_page_screen_id' ) ? wc_get_page_screen_id( 'shop-order' ) : 'shop_order';
    }
}