fcs/lib/pages/carton/model/package_selection_model.dart

import 'dart:async';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:logging/logging.dart';

import '../../../constants.dart';
import '../../../domain/entities/package.dart';
import '../../main/model/base_model.dart';

class PackageSelectionModel extends BaseModel {
  final log = Logger("PackageSelectionModel");
  String query = "";
  List<Package> packages = [];
  List<Package> selectedPackages = [];

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

  Timer? t;
  search(String term,
      {bool imm = false,
      required String shipmentId,
      required String senderId,
      required String consigneeId}) async {
    query = term;
    packages.clear();
    _lastDocument = null;
    ended = false;
    t?.cancel();
    t = Timer(Duration(milliseconds: imm ? 0 : 800), () async {
      await refresh(
          term: term,
          shipmentId: shipmentId,
          consigneeId: consigneeId,
          senderId: senderId);
    });
  }

  Future<void> refresh(
      {required String shipmentId,
      required String senderId,
      required String consigneeId,
      String term = ""}) async {
    packages.clear();
    _lastDocument = null;
    ended = false;
    await loadMoreData(
        shipmentId: shipmentId,
        senderId: senderId,
        consigneeId: consigneeId,
        term: term);
    notifyListeners();
  }

  Future<void> loadMoreData(
      {required String shipmentId,
      required String senderId,
      required String consigneeId,
      String term = ""}) async {
    int rowPerPage = 20;

    try {
      isLoading = true;
      String path = "/$packages_collection";
      Query query = FirebaseFirestore.instance
          .collection(path)
          .where("status",
              whereIn: [package_processed_status, package_packed_status])
          .where("sender_id", isEqualTo: senderId)
          .where("user_id", isEqualTo: consigneeId)
          .where("is_deleted", isEqualTo: false);

      if (term != "") {
        query = query.where("tracking_id", isEqualTo: term);
      }

      query = query.orderBy("created_date", 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<Package> list = querySnap.docs.map((documentSnapshot) {
        var p = Package.fromMap(documentSnapshot.data() as Map<String, dynamic>,
            documentSnapshot.id);
        return p;
      }).toList();

      for (var p in list) {
        selectedPackages.contains(p) ? p.isChecked = true : p.isChecked = false;
      }

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

  selectPackage(Package a) {
    if (a.isChecked) {
      selectedPackages.add(a);
    } else {
      selectedPackages.remove(a);
    }
  }

  addSelectedPackage(List<Package> list) {
    selectedPackages = list;
  }

  clearSelection() {
    selectedPackages.clear();
    packages.clear();
    query = "";
  }

  Future<List<Package>> getPackagesBySenderAndConsigneeId(
      {required String senderId, required String consigneeId}) async {
    List<Package> list = [];
    try {
      String path = "/$packages_collection";
      var snaps = await FirebaseFirestore.instance
          .collection(path)
          .where("sender_id", isEqualTo: senderId)
          .where("user_id", isEqualTo: consigneeId)
          .where("is_deleted", isEqualTo: false)
          .get(const GetOptions(source: Source.server));
      list = snaps.docs
          .map((documentSnapshot) =>
              Package.fromMap(documentSnapshot.data(), documentSnapshot.id))
          .toList();
    } catch (e) {
      log.warning("Error!! $e");
      list = [];
    }
    return list;
  }
}