import 'dart:typed_data';

import 'package:cached_network_image/cached_network_image.dart';
import 'package:comunic/helpers/groups_helper.dart';
import 'package:comunic/helpers/server_config_helper.dart';
import 'package:comunic/models/advanced_group_info.dart';
import 'package:comunic/models/conversation.dart';
import 'package:comunic/models/group.dart';
import 'package:comunic/models/new_group_conversation.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/log_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(),
        _buildConversationsArea(),
        _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();
              }),

          // Groups members list visibility
          SettingsTile.switchTile(
            title: tr("Make members list public"),
            onToggle: (s) {
              _groupSettings.isMembersListPublic = s;
              _updateSettings();
            },
            switchValue: _groupSettings.isMembersListPublic,
          )
        ],
      );

  List<MultiChoiceEntry<GroupMembershipLevel>>
      get _conversationMinMembershipLevel => [
            MultiChoiceEntry(
              id: GroupMembershipLevel.ADMINISTRATOR,
              title: tr("Administrators only"),
              subtitle: tr(
                  "Only the administrators of the group can access the conversation"),
            ),
            MultiChoiceEntry(
              id: GroupMembershipLevel.MODERATOR,
              title: tr("Moderators and administrators"),
              subtitle: tr(
                  "Only moderators and administrators of the group can access the conversation"),
            ),
            MultiChoiceEntry(
              id: GroupMembershipLevel.MEMBER,
              title: tr("All members"),
              subtitle: tr(
                  "All the members of the group can access the conversation"),
            ),
          ];

  SettingsSection _buildConversationsArea() => SettingsSection(
        title: tr("Group conversations"),
        tiles: _groupSettings.conversations
            .map(
              (e) {
                SettingsTile tile =
                    MultiChoicesSettingsTile<GroupMembershipLevel>(
                  title: e.name,
                  choices: _conversationMinMembershipLevel,
                  currentValue: e.groupMinMembershipLevel,
                  leading: e.hasLogo
                      ? CachedNetworkImage(
                          imageUrl: e.logoURL,
                          width: 30,
                        )
                      : Icon(Icons.group, size: 30),
                  onChanged: (c) => _changeConversationVisibility(e, c),
                  trailing: IconButton(
                    icon: Icon(Icons.delete),
                    onPressed: () => _deleteConversation(e),
                  ),
                );

                return tile;
              },
            )
            .toList()
            .cast<SettingsTile>()
              ..add(
                SettingsTile(
                  title: tr("Create a new conversation"),
                  onPressed: _createNewGroupConversation,
                ),
              ),
      );

  void _createNewGroupConversation(BuildContext context) async {
    try {
      final name = await askUserString(
        context: context,
        title: tr("New conversation name"),
        message: tr("Please give a name to the new conversation"),
        defaultValue: "",
        hint: tr("Name"),
        minLength: 1,
        maxLength: ServerConfigurationHelper
            .config.conversationsPolicy.maxConversationNameLen,
      );

      if (name == null) return;

      final visibility = await showMultiChoicesDialog(
        context: context,
        choices: _conversationMinMembershipLevel,
        defaultChoice: GroupMembershipLevel.MEMBER,
        title: tr("Conversation visibility"),
      );

      if (visibility == null) return;

      await GroupsHelper.createGroupConversation(NewGroupConversation(
        groupID: _groupSettings.id,
        name: name,
        minMembershipLevel: visibility,
      ));

      _key.currentState.refresh();
    } catch (e, s) {
      logError(e, s);
      snack(context, tr("Failed to create a conversation!"));
    }
  }

  void _changeConversationVisibility(
      Conversation conv, GroupMembershipLevel newLevel) async {
    try {
      await GroupsHelper.setConversationVisibility(conv.id, newLevel);

      _key.currentState.refresh();
    } catch (e, s) {
      logError(e, s);
      snack(context, tr("Failed to change conversation visibility level!"));
    }
  }

  void _deleteConversation(Conversation conv) async {
    try {
      if (!await showConfirmDialog(
          context: context,
          message: tr("Do you really want to delete this conversation?")))
        return;

      await GroupsHelper.deleteConversation(conv.id);

      _key.currentState.refresh();
    } catch (e, s) {
      logError(e, s);
      snack(context, tr("Failed to delete conversation!"));
    }
  }

  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);
      if (logo == null) return;
      await _doUploadLogo(logo.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"));
    }
  }
}