fcs/lib/fcs/common/pages/package/package_new.dart

import 'package:barcode_scan/barcode_scan.dart';
import 'package:fcs/fcs/common/domain/entities/package.dart';
import 'package:fcs/fcs/common/domain/entities/user.dart';
import 'package:fcs/fcs/common/helpers/theme.dart';
import 'package:fcs/fcs/common/pages/package/user_serach.dart';
import 'package:fcs/fcs/common/pages/staff/model/staff_model.dart';
import 'package:fcs/fcs/common/pages/util.dart';
import 'package:fcs/fcs/common/pages/widgets/display_text.dart';
import 'package:fcs/fcs/common/pages/widgets/local_text.dart';
import 'package:fcs/fcs/common/pages/widgets/progress.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:provider/provider.dart';

typedef void FindCallBack();

class PackageNew extends StatefulWidget {
  const PackageNew();
  @override
  _PackageNewState createState() => _PackageNewState();
}

class _PackageNewState extends State<PackageNew> {
  TextEditingController _phoneInput = new TextEditingController();

  bool _isLoading = false;
  User user;

  List<Package> packages = [];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    var fcsIDBox = Row(
      children: <Widget>[
        Expanded(
            child: DisplayText(
          text: user != null ? user.fcsID : "",
          labelText: getLocalString(context, "package.create.fcs.id"),
          iconData: Icons.perm_identity,
        )),
        IconButton(
            icon: Icon(Icons.search, color: primaryColor),
            onPressed: () => searchUser(context, callbackUserSelect: (u) {
                  setState(() {
                    this.user = u;
                  });
                })),
      ],
    );
    final namebox = DisplayText(
      text: user != null ? user.name : "",
      labelText: getLocalString(context, "package.create.name"),
      iconData: Icons.person,
    );
    final phoneNumberBox = DisplayText(
      text: user != null ? user.phoneNumber : "",
      labelText: getLocalString(context, "package.create.phone"),
      iconData: Icons.phone,
    );
    final createButton = fcsButton(
      context,
      getLocalString(context, 'package.create.packages'),
      callack: _create,
    );
    final packageList = Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: new List.generate(
              this.packages.length, (index) => _packageItem(context, index))
          .toList(),
    );

    return LocalProgress(
        inAsyncCall: _isLoading,
        child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            leading: new IconButton(
              icon: new Icon(Icons.close, color: primaryColor, size: 30),
              onPressed: () => Navigator.of(context).pop(),
            ),
            shadowColor: Colors.transparent,
            backgroundColor: Colors.white,
            title: LocalText(
              context,
              "package.create.title",
              fontSize: 20,
              color: primaryColor,
            ),
          ),
          body: Padding(
            padding: const EdgeInsets.only(left: 12.0, right: 12),
            child: ListView(
              children: <Widget>[
                fcsIDBox,
                phoneNumberBox,
                namebox,
                Divider(),
                Center(
                    child: Row(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: [
                    Text("Packages (${packages.length})"),
                    SizedBox(
                      width: 30,
                    ),
                    IconButton(
                      icon: Icon(
                        Icons.add,
                        color: primaryColor,
                      ),
                      onPressed: _scan,
                    )
                  ],
                )),
                packageList,
                Divider(),
                SizedBox(
                  height: 20,
                ),
                createButton,
                SizedBox(
                  height: 10,
                ),
              ],
            ),
          ),
        ));
  }

  void _scan() async {
    PermissionStatus permission =
        await PermissionHandler().checkPermissionStatus(PermissionGroup.camera);
    if (permission != PermissionStatus.granted) {
      Map<PermissionGroup, PermissionStatus> permissions =
          await PermissionHandler()
              .requestPermissions([PermissionGroup.camera]);
      if (permissions[PermissionGroup.camera] != PermissionStatus.granted) {
        showMsgDialog(context, "Error", "Camera permission is not granted");
        return null;
      }
    }

    String barcode;
    try {
      barcode = await BarcodeScanner.scan();
    } on PlatformException catch (e) {
      if (e.code == BarcodeScanner.CameraAccessDenied) {
        print('The user did not grant the camera permission!');
      } else {
        print('Unknown error: $e');
      }
    } on FormatException {
      print(
          'null (User returned using the "back"-button before scanning anything. Result)');
    } catch (e) {
      print('Unknown error: $e');
    }

    if (barcode != null) {
      if (packages.any((e) => e.trackingID == barcode)) {
        showMsgDialog(context, "Error", "Already scanned!");
        return;
      }
      setState(() {
        packages.add(Package(trackingID: barcode));
      });
    }
  }

  Widget _packageItem(BuildContext context, int index) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Expanded(
          child: DisplayText(
            labelText: "Tracking ID",
            text: packages[index].trackingID,
          ),
        ),
        IconButton(
          icon: Icon(
            Icons.remove,
            color: primaryColor,
          ),
          onPressed: () {
            setState(() {
              packages.removeAt(index);
            });
          },
        )
      ],
    );
  }

  _create() async {
    if (user == null || packages == null || packages.length == 0) {
      showMsgDialog(context, "Error", "Invalid user!");
      return;
    }
    setState(() {
      _isLoading = true;
    });
    StaffModel staffModel = Provider.of<StaffModel>(context, listen: false);
    try {
      // await staffModel.updatePrivileges(this.selectedUser.id, privilegesIDs());
      Navigator.pop(context);
    } catch (e) {
      showMsgDialog(context, "Error", e.toString());
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }
}