import 'package:comunic/helpers/groups_helper.dart';
import 'package:comunic/models/group.dart';
import 'package:comunic/ui/widgets/safe_state.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:comunic/utils/ui_utils.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';

/// Group membership information widget
///
/// @author Pierre Hubert

class GroupMembershipWidget extends StatefulWidget {
  final Group group;
  final Function() onUpdated;
  final Function() onError;

  const GroupMembershipWidget(
      {@required this.group, this.onUpdated, this.onError})
      : assert(group != null);

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

class _GroupMembershipWidgetState extends SafeState<GroupMembershipWidget> {
  Group get group => widget.group;

  int get _id => group.id;

  GroupMembershipLevel get _level => group.membershipLevel;

  @override
  Widget build(BuildContext context) {
    switch (_level) {
      case GroupMembershipLevel.ADMINISTRATOR:
        return Text(tr("Administrator"));

      case GroupMembershipLevel.MODERATOR:
        return Text(tr("Moderator"));

      case GroupMembershipLevel.MEMBER:
        return Text(tr("Member"));

      case GroupMembershipLevel.INVITED:
        return _buildInvitedState();

      case GroupMembershipLevel.PENDING:
        return _buildPendingState();

      case GroupMembershipLevel.VISITOR:
        return _buildVisitorState();

      default:
        throw Exception("Unknown group membership level state: $_level");
    }
  }

  /// Build invited state
  Widget _buildInvitedState() {
    return RichText(
      text: TextSpan(children: [
        WidgetSpan(
            child: Icon(Icons.info_outline, size: 12),
            alignment: PlaceholderAlignment.middle),
        TextSpan(text: " " + tr("Invited") + " ", style: blackForWhiteTheme()),
        TextSpan(
            text: tr("Accept"),
            style: TextStyle(color: Colors.green),
            recognizer: TapGestureRecognizer()
              ..onTap = () => _respondInvitation(true)),
        TextSpan(text: "  "),
        TextSpan(
            text: tr("Reject"),
            style: TextStyle(color: Colors.red),
            recognizer: TapGestureRecognizer()
              ..onTap = () => _respondInvitation(false)),
      ]),
    );
  }

  /// Respond to an invitation
  void _respondInvitation(bool accept) async {
    if (!accept &&
        !await showConfirmDialog(
            context: context,
            message: tr("Do you really want to reject this invitation?")))
      return;

    if (!await GroupsHelper().respondInvitation(_id, accept)) {
      showSimpleSnack(context, tr("Could not respond to your invitation!"));
      if (this.widget.onError != null) this.widget.onError();
    } else {
      // Refresh state
      group.membershipLevel =
          accept ? GroupMembershipLevel.MEMBER : GroupMembershipLevel.VISITOR;
      this.setState(() {});

      if (this.widget.onUpdated != null) this.widget.onUpdated();
    }
  }

  /// Build pending state
  Widget _buildPendingState() {
    return RichText(
      text: TextSpan(children: [
        WidgetSpan(
            child: Icon(Icons.access_time, size: 12),
            alignment: PlaceholderAlignment.middle),
        TextSpan(
            text: " " + tr("Requested") + " ", style: blackForWhiteTheme()),
        TextSpan(
            text: tr("Cancel"),
            style: TextStyle(color: Colors.blue),
            recognizer: TapGestureRecognizer()..onTap = () => _cancelRequest()),
      ]),
    );
  }

  /// Cancel group membership request
  void _cancelRequest() async {
    if (!await GroupsHelper().cancelRequest(_id)) {
      showSimpleSnack(context, tr("Could not cancel your membership request!"));
      if (this.widget.onError != null) this.widget.onError();
    } else {
      // Refresh state
      group.membershipLevel = GroupMembershipLevel.VISITOR;
      this.setState(() {});

      if (this.widget.onUpdated != null) this.widget.onUpdated();
    }
  }

  /// Build visitor state
  Widget _buildVisitorState() {
    // Check if the user can request membership
    if (group.registrationLevel == GroupRegistrationLevel.CLOSED)
      return Text(tr("Closed registration"));

    return RichText(
      text: TextSpan(
          text: tr("Request membership"),
          recognizer: TapGestureRecognizer()
            ..onTap = () => _requestMembership()),
    );
  }

  /// Create new membership request
  void _requestMembership() async {
    if (!await GroupsHelper().sendRequest(_id)) {
      showSimpleSnack(context, tr("Could not send your membership request!"));
      if (this.widget.onError != null) this.widget.onError();
    } else {
      // Refresh state
      group.membershipLevel = GroupMembershipLevel.PENDING;
      this.setState(() {});

      if (this.widget.onUpdated != null) this.widget.onUpdated();
    }
  }
}