import 'package:flutter/material.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:satu/core/models/but_item/buy_item_response.dart';
import 'package:satu/views/work/tabs/buy/component/product_buy_tile.dart';


import '../../../../core/models/buy_invoice/buy_invoice_response.dart';
import '../../../../core/services/buy_service.dart';
import '../../../../core/services/navigator_service.dart';
import '../../../../core/utils/locator.dart';
import '../../../../shared/app_colors.dart';
import '../../../../widgets/bar/products_app_bar.dart';

class BuyEditView extends StatefulWidget {
  const BuyEditView({required this.invoice, Key? key}) : super(key: key);

  final BuyInvoiceResponse invoice;

  @override
  State<BuyEditView> createState() => _BuyEditViewState();
}

class _BuyEditViewState extends State<BuyEditView> {
  final BuyService _service = locator<BuyService>();

  static const _pageSize = 20;

  final PagingController<int, BuyItemResponse> _pagingController =
  PagingController(firstPageKey: 1);


  @override
  void initState() {
    _pagingController.addPageRequestListener((pageKey) {
      _fetchData(pageKey, _pageSize);
    });
    super.initState();
  }

  @override
  void dispose() {

    _pagingController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: const ProductsAppBar(
        title: 'Покупка',
      ),
      body: Column(
        children: [
          Expanded(
            child: PagedListView<int, BuyItemResponse>.separated(
              physics: const BouncingScrollPhysics(),
              separatorBuilder: (BuildContext context, int index) {
                return const Divider(
                  height: 1.0,
                  color: disableColor,
                );
              },
              pagingController: _pagingController,
              builderDelegate: PagedChildBuilderDelegate<BuyItemResponse>(
                itemBuilder: (BuildContext context, BuyItemResponse item,
                    int index) {
                  return ProductBuyTile(
                    key: ValueKey(item.id),
                    ean: '1234567890123',
                    name: 'Картофель',
                    price: item.price,
                    count: item.cnt,
                    categoryName: 'Овощи',
                    isOdd: true,
                  );
                },
              ),
            ),
          )
        ],
      ),
    );
  }

  Future<void> _fetchData(int pageKey, int perPage) async {
    final List<BuyItemResponse> newItems = await _service
        .getItemList(widget.invoice.id, page: pageKey, perpage: perPage);
    final isLastPage = newItems.length < _pageSize;
    if (isLastPage) {
      _pagingController.appendLastPage(newItems);
    } else {
      final nextPageKey = pageKey + 1;
      _pagingController.appendPage(newItems, nextPageKey);
    }
  }

}