import 'dart:typed_data';

import 'package:comunic/helpers/groups_helper.dart';
import 'package:comunic/models/advanced_group_info.dart';
import 'package:comunic/models/group.dart';
import 'package:comunic/ui/dialogs/input_user_password_dialog.dart';
import 'package:comunic/ui/dialogs/multi_choices_dialog.dart';
import 'package:comunic/ui/dialogs/virtual_directory_dialog.dart';
import 'package:comunic/ui/routes/main_route/main_route.dart';
import 'package:comunic/ui/widgets/async_screen_widget.dart';
import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
import 'package:comunic/ui/widgets/group_icon_widget.dart';
import 'package:comunic/ui/widgets/safe_state.dart';
import 'package:comunic/ui/widgets/settings/header_spacer_section.dart';
import 'package:comunic/ui/widgets/settings/multi_choices_settings_tile.dart';
import 'package:comunic/ui/widgets/settings/text_settings_edit_tile.dart';
import 'package:comunic/utils/files_utils.dart';
import 'package:comunic/utils/input_utils.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:comunic/utils/ui_utils.dart';
import 'package:flutter/material.dart';
import 'package:identicon/identicon.dart';
import 'package:random_string/random_string.dart';
import 'package:settings_ui/settings_ui.dart';

/// Groups settings screen
///
/// @author Pierre Hubert

class GroupSettingsScreen extends StatefulWidget {
  final int groupID;

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

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

class _GroupSettingsScreenState extends SafeState<GroupSettingsScreen> {
  AdvancedGroupInfo _groupSettings;

  final _key = GlobalKey<AsyncScreenWidgetState>();

  Future<void> _refresh() async {
    _groupSettings = await GroupsHelper().getSettings(widget.groupID);
  }

  Future<void> _updateSettings() async {
    try {
      await GroupsHelper.setSettings(_groupSettings);
    } catch (e, stack) {
      print("Could not update group settings! $e\n$stack");
      showSimpleSnack(context, tr("Could not update group settings!"));
    }

    _key.currentState.refresh();
  }

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

  Widget _buildBody() {
    return AsyncScreenWidget(
      key: _key,
      onReload: _refresh,
      onBuild: _buildContent,
      errorMessage: tr("Could not get group settings!"),
      showOldDataWhileUpdating: true,
    );
  }

  Widget _buildContent() {
    return SettingsList(
      sections: [
        HeadSpacerSection(),
        _buildGeneralSection(),
        _buildAccessRestrictions(),
        _buildGroupLogoArea(),
        _buildDangerZone(),
      ],
    );
  }

  Widget _buildGeneralSection() {
    return SettingsSection(
      title: tr("General information"),
      tiles: [
        // Group ID
        SettingsTile(
          title: tr("Group ID"),
          subtitle: _groupSettings.id.toString(),
        ),

        // Group name
        TextEditSettingsTile(
            title: tr("Group name"),
            currValue: _groupSettings.name,
            onChanged: (s) {
              _groupSettings.name = s;
              _updateSettings();
            }),

        // Group virtual directory
        SettingsTile(
          title: tr("Virtual directory (optional)"),
          subtitle: _groupSettings.virtualDirectory,
          onPressed: (_) async {
            final newDir = await showVirtualDirectoryDialog(
              context: context,
              initialDirectory: _groupSettings.virtualDirectory,
              id: _groupSettings.id,
              type: VirtualDirectoryTargetType.GROUP,
            );

            if (newDir == null) return;

            _groupSettings.virtualDirectory = newDir;
            _updateSettings();
          },
        ),

        // Group URL
        TextEditSettingsTile(
          title: tr("Group URL (optional)"),
          currValue: _groupSettings.url,
          checkInput: validateUrl,
          allowEmptyValues: true,
          onChanged: (s) {
            _groupSettings.url = s;
            _updateSettings();
          },
        ),

        // Group description
        TextEditSettingsTile(
            title: tr("Group description (optional)"),
            currValue: _groupSettings.description,
            maxLines: 3,
            maxLength: 255,
            allowEmptyValues: true,
            onChanged: (s) {
              _groupSettings.description = s;
              _updateSettings();
            }),
      ],
    );
  }

  List<MultiChoiceEntry<GroupVisibilityLevel>> get _visibilityLevels => [
        MultiChoiceEntry(
          id: GroupVisibilityLevel.OPEN,
          title: tr("Open group"),
          subtitle:
              tr("Group information & public posts are available to everyone."),
        ),
        MultiChoiceEntry(
          id: GroupVisibilityLevel.PRIVATE,
          title: tr("Private group"),
          subtitle: tr("The group is accessible to accepted members only."),
        ),
        MultiChoiceEntry(
          id: GroupVisibilityLevel.SECRETE,
          title: tr("Secrete group"),
          subtitle: tr("The group is visible only to invited members."),
        ),
      ];

  List<MultiChoiceEntry<GroupRegistrationLevel>> get _registrationLevels => [
        MultiChoiceEntry(
          id: GroupRegistrationLevel.OPEN,
          title: tr("Open registration"),
          subtitle: tr(
              "Everyone can choose to join the group without moderator approval"),
        ),
        MultiChoiceEntry(
          id: GroupRegistrationLevel.MODERATED,
          title: tr("Moderated registration"),
          subtitle: tr(
              "Everyone can request a membership, but a moderator review the request"),
        ),
        MultiChoiceEntry(
          id: GroupRegistrationLevel.CLOSED,
          title: tr("Closed registration"),
          subtitle: tr(
              "The only way to join the group is to be invited by a moderator"),
        ),
      ];

  List<MultiChoiceEntry<GroupPostCreationLevel>> get _postsCreationLevels => [
        MultiChoiceEntry(
          id: GroupPostCreationLevel.MEMBERS,
          title: tr("All members"),
          subtitle:
              tr("All the members of the group can create posts on the group"),
        ),
        MultiChoiceEntry(
          id: GroupPostCreationLevel.MODERATORS,
          title: tr("Moderators only"),
          subtitle: tr(
              "Only moderators and administrators of the group can create posts on it"),
        ),
      ];

  Widget _buildAccessRestrictions() => SettingsSection(
        title: tr("Access restrictions"),
        tiles: [
          // Group visibility
          MultiChoicesSettingsTile(
              title: tr("Group visibility"),
              choices: _visibilityLevels,
              currentValue: _groupSettings.visibilityLevel,
              onChanged: (v) {
                _groupSettings.visibilityLevel = v;
                _updateSettings();
              }),

          // Group registration level
          MultiChoicesSettingsTile(
              title: tr("Group registration level"),
              choices: _registrationLevels,
              currentValue: _groupSettings.registrationLevel,
              onChanged: (v) {
                _groupSettings.registrationLevel = v;
                _updateSettings();
              }),

          // Group posts creation levels
          MultiChoicesSettingsTile(
              title: tr("Posts creation level"),
              choices: _postsCreationLevels,
              currentValue: _groupSettings.postCreationLevel,
              onChanged: (s) {
                _groupSettings.postCreationLevel = s;
                _updateSettings();
              }),
        ],
      );

  Widget _buildGroupLogoArea() {
    return SettingsSection(
      title: tr("Group logo"),
      tiles: [
        // Current logo
        SettingsTile(
          title: tr("Current logo"),
          leading: GroupIcon(group: _groupSettings),
        ),

        // Upload a new logo
        SettingsTile(
          title: tr("Upload a new logo"),
          onPressed: (_) => _uploadNewLogo,
        ),

        // Generate a new random logo
        SettingsTile(
          title: tr("Generate a new random logo"),
          onPressed: (_) => _generateRandomLogo,
        ),

        // Delete current logo
        SettingsTile(
          title: tr("Delete logo"),
          onPressed: (_) => _deleteLogo,
        ),
      ],
    );
  }

  /// Upload a new logo for the group
  void _uploadNewLogo() async {
    try {
      final logo = await pickImage(context);
      final bytes = await logo.readAsBytes();
      await _doUploadLogo(bytes);
    } catch (e, stack) {
      print("Could not upload new logo! $e\n$stack");
      showSimpleSnack(context, tr("Could not upload new logo!"));
    }
  }

  /// Generate a new random logo for the group
  void _generateRandomLogo() async {
    try {
      final newLogo =
          Identicon(rows: 10, cols: 10).generate(randomString(20), size: 100);
      await _doUploadLogo(newLogo);
    } catch (e, stack) {
      print("Could not generate new logo! $e\n$stack");
      showSimpleSnack(context, tr("Could not generate new random logo!"));
    }
  }

  Future<void> _doUploadLogo(Uint8List bytes) async {
    await GroupsHelper.uploadNewLogo(_groupSettings.id, bytes);
    _key.currentState.refresh();
  }

  /// Delete previous group logo
  void _deleteLogo() async {
    try {
      if (!await showConfirmDialog(
          context: context,
          message: tr("Do you really want to delete the logo of this group ?")))
        return;

      await GroupsHelper.deleteLogo(_groupSettings.id);
      _key.currentState.refresh();
    } catch (e, s) {
      print("Could not delete group logo! $e\n$s");
      showSimpleSnack(context, tr("Could not delete group logo!"));
    }
  }

  Widget _buildDangerZone() {
    return SettingsSection(
      title: tr("Danger zone"),
      tiles: [
        SettingsTile(
          title: tr("Delete group"),
          onPressed: (_) => _deleteGroup,
        ),
      ],
    );
  }

  /// Delete the group
  void _deleteGroup() async {
    try {
      final password = await showUserPasswordDialog(context);

      if (password == null) return;

      if (!await showConfirmDialog(
          context: context,
          message: tr(
              "Do you really want to delete this group ? All the posts related to it will be permanently deleted!")))
        return;

      await GroupsHelper.deleteGroup(_groupSettings.id, password);

      MainController.of(context).popPage();
    } catch (e, s) {
      print("Could not delete the group! $e\n$s");
      showSimpleSnack(context, tr("Could not delete the group"));
    }
  }
}