import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:invoiceninja_flutter/data/models/models.dart';
import 'package:invoiceninja_flutter/ui/app/loading_indicator.dart';
import 'package:invoiceninja_flutter/ui/app/snackbar_row.dart';
import 'package:invoiceninja_flutter/ui/project/project_list_item.dart';
import 'package:invoiceninja_flutter/ui/project/project_list_vm.dart';
import 'package:invoiceninja_flutter/utils/icons.dart';
import 'package:invoiceninja_flutter/utils/localization.dart';

class ProjectList extends StatelessWidget {
  const ProjectList({
    Key key,
    @required this.viewModel,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    if (!viewModel.isLoaded) {
      return LoadingIndicator();
    } else if (viewModel.projectList.isEmpty) {
      return Opacity(
        opacity: 0.5,
        child: Center(
          child: Text(
            AppLocalization.of(context).noRecordsFound,
            style: TextStyle(
              fontSize: 18.0,
            ),
          ),
        ),
      );
    }

    return _buildListView(context);
  }

  void _showMenu(
      BuildContext context, ProjectEntity project) async {
    if (project == null) {
      return;
    }

    final user = viewModel.user;
    final message = await showDialog<String>(
        context: context,
        builder: (BuildContext dialogContext) => SimpleDialog(
                children: project
                    .getEntityActions(user: user)
                    .map((entityAction) {
              if (entityAction == null) {
                return Divider();
              } else {
                return ListTile(
                  leading: Icon(getEntityActionIcon(entityAction)),
                  title: Text(AppLocalization.of(context)
                      .lookup(entityAction.toString())),
                  onTap: () {
                    Navigator.of(dialogContext).pop();
                    viewModel.onEntityAction(context, project, entityAction);
                  },
                );
              }
            }).toList()));

    if (message != null) {
      Scaffold.of(context).showSnackBar(SnackBar(
          content: SnackBarRow(
        message: message,
      )));
    }
  }

  Widget _buildListView(BuildContext context) {
    return RefreshIndicator(
      onRefresh: () => viewModel.onRefreshed(context),
      child: ListView.builder(
          itemCount: viewModel.projectList.length,
          itemBuilder: (BuildContext context, index) {
            final projectId = viewModel.projectList[index];
            final project = viewModel.projectMap[projectId];
            return Column(children: <Widget>[
              ProjectListItem(
                user: viewModel.user,
                filter: viewModel.filter,
                project: project,
                onEntityAction: (EntityAction action) {
                  if (action == EntityAction.more) {
                    _showMenu(context, project);
                  } else {
                    viewModel.onEntityAction(context, project, action);
                  }
                },
                onTap: () => viewModel.onProjectTap(context, project),
                onLongPress: () => _showMenu(context, project),
              ),
              Divider(
                height: 1.0,
              ),
            ]);
          }),
    );
  }

  final ProjectListVM viewModel;
}