import 'package:comunic/helpers/groups_helper.dart';
import 'package:comunic/helpers/users_helper.dart';
import 'package:comunic/lists/group_members_list.dart';
import 'package:comunic/lists/users_list.dart';
import 'package:comunic/models/group.dart';
import 'package:comunic/models/group_membership.dart';
import 'package:comunic/ui/dialogs/multi_choices_dialog.dart';
import 'package:comunic/ui/widgets/account_image_widget.dart';
import 'package:comunic/ui/widgets/async_screen_widget.dart';
import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/material.dart';

/// Group members screen
///
/// @author Pierre HUBERT

class GroupMembersScreen extends StatefulWidget {
  final int groupID;

  const GroupMembersScreen({Key key, this.groupID})
      : assert(groupID != null),
        super(key: key);

  @override
  _GroupMembersScreenState createState() => _GroupMembersScreenState();
}

class _GroupMembersScreenState extends State<GroupMembersScreen> {
  GroupMembersList _members;
  UsersList _users;

  Future<void> _refresh() async {
    final members = await GroupsHelper.getMembersList(widget.groupID);
    final users = await UsersHelper().getListWithThrow(members.usersID);

    _members = members;
    _users = users;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: ComunicBackButton(),
        title: Text(tr("Group members")),
      ),
      body: _buildBody(),
    );
  }

  Widget _buildBody() => AsyncScreenWidget(
        onReload: _refresh,
        onBuild: _buildBodyContent,
        errorMessage: tr("Could not load the list of members of this group!"),
        showOldDataWhileUpdating: true,
      );

  Widget _buildBodyContent() {
    return ListView(
      children: _members.map(_buildGroupMemberTile).toList(),
    );
  }

  List<MultiChoiceEntry<GroupMembershipLevel>> get _membershipLevels => [
        MultiChoiceEntry(
            id: GroupMembershipLevel.ADMINISTRATOR,
            title: tr("Administrator"),
            subtitle:
                tr("Can change members privileges and change group settings")),
        MultiChoiceEntry(
            id: GroupMembershipLevel.MODERATOR,
            title: tr("Moderator"),
            subtitle: tr(
                "Can always create posts, invite users and respond to membership request")),
        MultiChoiceEntry(
            id: GroupMembershipLevel.MEMBER,
            title: tr("Member"),
            subtitle: tr("Can access to all group posts")),
        MultiChoiceEntry(
            id: GroupMembershipLevel.PENDING, title: tr("Requested")),
        MultiChoiceEntry(
            id: GroupMembershipLevel.INVITED, title: tr("Invited")),
        MultiChoiceEntry(
            id: GroupMembershipLevel.VISITOR, title: tr("Visitor")),
      ];

  ListTile _buildGroupMemberTile(GroupMembership membership) {
    final user = _users.getUser(membership.userID);

    return ListTile(
      leading: AccountImageWidget(
        user: user,
      ),
      title: Text(user.displayName),
      subtitle: Text(
          _membershipLevels.firstWhere((f) => f.id == membership.level).title),
    );
  }
}