import 'dart:async';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fcs/domain/entities/fcs_shipment.dart';
import 'package:logging/logging.dart';

import '../../../constants.dart';
import '../../main/model/base_model.dart';

class ShipmentSelectionModel extends BaseModel {
  final log = Logger("ShipmentSelectionModel");

  List<FcsShipment> _shipments = [];

  List<FcsShipment> get getShipments {
    var list = new List<FcsShipment>.from(_shipments);
    return list
      ..insert(0, FcsShipment(id: all, shipmentNumber: "All shipments"));
  }

  bool isLoading = false;
  DocumentSnapshot? _lastDocument;
  bool ended = false;

  Future<void> refresh() async {
    _shipments.clear();
    _lastDocument = null;
    ended = false;
    await loadMoreData();
    notifyListeners();
  }

  Future<void> loadMoreData() async {
    int rowPerPage = 20;

    try {
      isLoading = true;
      String path = "/$fcs_shipment_collection";
      Query query = FirebaseFirestore.instance
          .collection(path)
          .where("status", whereIn: [
            fcs_shipment_processed_status,
            fcs_shipment_shipped_status,
            fcs_shipment_arrived_status,
            fcs_shipment_invoiced_status
          ])
          .where("is_deleted", isEqualTo: false)
          .orderBy("update_time", descending: true);

      if (_lastDocument != null) {
        query = query.startAfterDocument(_lastDocument!);
      }

      QuerySnapshot querySnap = await query.limit(rowPerPage).get();

      if (querySnap.docs.isEmpty) return;
      _lastDocument = querySnap.docs[querySnap.docs.length - 1];

      List<FcsShipment> list = querySnap.docs.map((documentSnapshot) {
        var p = FcsShipment.fromMap(
            documentSnapshot.data() as Map<String, dynamic>,
            documentSnapshot.id);
        return p;
      }).toList();

      _shipments.addAll(list);
      if (list.length < rowPerPage) ended = true;
      notifyListeners();
    } catch (e) {
      log.warning("error:$e");
    } finally {
      isLoading = false;
    }
  }
}