import 'package:auto_route/auto_route.dart';
import 'package:collection/collection.dart';
import 'package:croppy/croppy.dart' hide cropImage;
import 'package:dio/dio.dart';
import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:gap/gap.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:image_picker/image_picker.dart';
import 'package:island/models/chat.dart';
import 'package:island/models/file.dart';
import 'package:island/models/realm.dart';
import 'package:island/pods/chat_summary.dart';
import 'package:island/pods/config.dart';
import 'package:island/pods/network.dart';
import 'package:island/route.gr.dart';
import 'package:island/screens/realm/realms.dart';
import 'package:island/services/file.dart';
import 'package:island/services/responsive.dart';
import 'package:island/widgets/account/account_picker.dart';
import 'package:island/widgets/alert.dart';
import 'package:island/widgets/app_scaffold.dart';
import 'package:island/widgets/content/cloud_files.dart';
import 'package:island/widgets/realms/selection_dropdown.dart';
import 'package:island/widgets/response.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:relative_time/relative_time.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:styled_widget/styled_widget.dart';

part 'chat.g.dart';

class ChatRoomListTile extends HookConsumerWidget {
  final SnChatRoom room;
  final bool isDirect;
  final Widget? subtitle;
  final Widget? trailing;
  final VoidCallback? onTap;

  const ChatRoomListTile({
    super.key,
    required this.room,
    this.isDirect = false,
    this.subtitle,
    this.trailing,
    this.onTap,
  });

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final summary = ref
        .watch(chatSummaryProvider)
        .whenData((summaries) => summaries[room.id]);

    Widget buildSubtitle() {
      if (subtitle != null) return subtitle!;

      return summary.when(
        data: (data) {
          if (data == null) {
            return isDirect && room.description == null
                ? Text(
                  room.members!.map((e) => '@${e.account.name}').join(', '),
                  maxLines: 1,
                )
                : Text(room.description ?? 'descriptionNone'.tr(), maxLines: 1);
          }

          return Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              if (data.unreadCount > 0)
                Text(
                  'unreadMessages'.plural(data.unreadCount),
                  style: Theme.of(context).textTheme.bodySmall?.copyWith(
                    color: Theme.of(context).colorScheme.primary,
                  ),
                ),
              Row(
                children: [
                  Text(
                    '${data.lastMessage.sender.account.name}: ',
                    style: Theme.of(context).textTheme.bodySmall,
                  ),
                  Expanded(
                    child: Text(
                      (data.lastMessage.content?.isNotEmpty ?? false)
                          ? data.lastMessage.content!
                          : 'messageNone'.tr(),
                      maxLines: 1,
                      overflow: TextOverflow.ellipsis,
                      style: Theme.of(context).textTheme.bodySmall,
                    ),
                  ),
                  Align(
                    alignment: Alignment.centerRight,
                    child: Text(
                      RelativeTime(context).format(data.lastMessage.createdAt),
                      style: Theme.of(context).textTheme.bodySmall,
                    ),
                  ),
                ],
              ),
            ],
          );
        },
        loading: () => const SizedBox.shrink(),
        error:
            (_, __) =>
                isDirect && room.description == null
                    ? Text(
                      room.members!.map((e) => '@${e.account.name}').join(', '),
                      maxLines: 1,
                    )
                    : Text(
                      room.description ?? 'descriptionNone'.tr(),
                      maxLines: 1,
                    ),
      );
    }

    return ListTile(
      leading: Badge(
        isLabelVisible: summary.when(
          data: (data) => (data?.unreadCount ?? 0) > 0,
          loading: () => false,
          error: (_, __) => false,
        ),
        child:
            (isDirect && room.pictureId == null)
                ? SplitAvatarWidget(
                  filesId:
                      room.members!
                          .map((e) => e.account.profile.pictureId)
                          .toList(),
                )
                : room.pictureId == null
                ? CircleAvatar(child: Text(room.name![0].toUpperCase()))
                : ProfilePictureWidget(fileId: room.pictureId),
      ),
      title: Text(
        (isDirect && room.name == null)
            ? room.members!.map((e) => e.account.nick).join(', ')
            : room.name ?? '',
      ),
      subtitle: buildSubtitle(),
      onTap: () async {
        // Clear unread count if there are unread messages
        final summary = await ref.read(chatSummaryProvider.future);
        if ((summary[room.id]?.unreadCount ?? 0) > 0) {
          await ref
              .read(chatSummaryProvider.notifier)
              .clearUnreadCount(room.id);
        }
        onTap?.call();
      },
    );
  }
}

@riverpod
Future<List<SnChatRoom>> chatroomsJoined(Ref ref) async {
  final client = ref.watch(apiClientProvider);
  final resp = await client.get('/chat');
  return resp.data
      .map((e) => SnChatRoom.fromJson(e))
      .cast<SnChatRoom>()
      .toList();
}

@RoutePage()
class ChatShellScreen extends HookConsumerWidget {
  const ChatShellScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final isWide = isWideScreen(context);

    if (isWide) {
      return AppBackground(
        isRoot: true,
        child: Row(
          children: [
            Flexible(flex: 2, child: ChatListScreen(isAside: true)),
            VerticalDivider(width: 1),
            Flexible(flex: 4, child: AutoRouter()),
          ],
        ),
      );
    }

    return AppBackground(isRoot: true, child: AutoRouter());
  }
}

@RoutePage()
class ChatListScreen extends HookConsumerWidget {
  final bool isAside;
  const ChatListScreen({super.key, this.isAside = false});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final isWide = isWideScreen(context);
    if (isWide && !isAside) {
      return const EmptyPageHolder();
    }

    final chats = ref.watch(chatroomsJoinedProvider);
    final chatInvites = ref.watch(chatroomInvitesProvider);
    final tabController = useTabController(initialLength: 3);
    final selectedTab = useState(
      0,
    ); // 0 for All, 1 for Direct Messages, 2 for Group Chats

    useEffect(() {
      tabController.addListener(() {
        selectedTab.value = tabController.index;
      });
      return null;
    }, [tabController]);

    Future<void> createDirectMessage() async {
      final result = await showModalBottomSheet(
        context: context,
        builder: (context) => AccountPickerSheet(),
      );
      if (result == null) return;
      final client = ref.read(apiClientProvider);
      try {
        await client.post('/chat/direct', data: {'related_user_id': result.id});
        ref.invalidate(chatroomsJoinedProvider);
      } catch (err) {
        showErrorAlert(err);
      }
    }

    return AppScaffold(
      appBar: AppBar(
        title: Text('chat').tr(),
        bottom: TabBar(
          controller: tabController,
          tabs: [
            Tab(text: 'chatTabAll'.tr()),
            Tab(text: 'chatTabDirect'.tr()),
            Tab(text: 'chatTabGroup'.tr()),
          ],
        ),
        actions: [
          IconButton(
            icon: Badge(
              label: Text(
                chatInvites.when(
                  data: (invites) => invites.length.toString(),
                  error: (_, __) => '0',
                  loading: () => '0',
                ),
              ),
              isLabelVisible: chatInvites.when(
                data: (invites) => invites.isNotEmpty,
                error: (_, __) => false,
                loading: () => false,
              ),
              child: const Icon(Symbols.email),
            ),
            onPressed: () {
              showModalBottomSheet(
                isScrollControlled: true,
                context: context,
                builder: (context) => _ChatInvitesSheet(),
              );
            },
          ),
          const Gap(8),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          showModalBottomSheet(
            context: context,
            builder:
                (context) => Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    ListTile(
                      title: Text('createChatRoom').tr(),
                      leading: const Icon(Symbols.add),
                      onTap: () {
                        Navigator.pop(context);
                        context.pushRoute(NewChatRoute()).then((value) {
                          if (value != null) {
                            ref.invalidate(chatroomsJoinedProvider);
                          }
                        });
                      },
                    ),
                    ListTile(
                      title: Text('createDirectMessage').tr(),
                      leading: const Icon(Symbols.person),
                      onTap: () {
                        Navigator.pop(context);
                        createDirectMessage();
                      },
                    ),
                    Gap(MediaQuery.of(context).padding.bottom + 16),
                  ],
                ),
          );
        },
        child: const Icon(Symbols.add),
      ),
      body: chats.when(
        data:
            (items) => RefreshIndicator(
              onRefresh:
                  () => Future.sync(() {
                    ref.invalidate(chatroomsJoinedProvider);
                  }),
              child: ListView.builder(
                padding: EdgeInsets.zero,
                itemCount:
                    items
                        .where(
                          (item) =>
                              selectedTab.value == 0 ||
                              (selectedTab.value == 1 && item.type == 1) ||
                              (selectedTab.value == 2 && item.type != 1),
                        )
                        .length,
                itemBuilder: (context, index) {
                  final filteredItems =
                      items
                          .where(
                            (item) =>
                                selectedTab.value == 0 ||
                                (selectedTab.value == 1 && item.type == 1) ||
                                (selectedTab.value == 2 && item.type != 1),
                          )
                          .toList();
                  final item = filteredItems[index];
                  return ChatRoomListTile(
                    room: item,
                    isDirect: item.type == 1,
                    onTap: () {
                      if (context.router.topRoute.name == ChatRoomRoute.name) {
                        context.router.replace(ChatRoomRoute(id: item.id));
                      } else {
                        context.router.push(ChatRoomRoute(id: item.id));
                      }
                    },
                  );
                },
              ),
            ),
        loading: () => const Center(child: CircularProgressIndicator()),
        error:
            (error, stack) => ResponseErrorWidget(
              error: error,
              onRetry: () {
                ref.invalidate(chatroomsJoinedProvider);
              },
            ),
      ),
    );
  }
}

@riverpod
Future<SnChatRoom?> chatroom(Ref ref, String? identifier) async {
  if (identifier == null) return null;
  final client = ref.watch(apiClientProvider);
  final resp = await client.get('/chat/$identifier');
  return SnChatRoom.fromJson(resp.data);
}

@riverpod
Future<SnChatMember?> chatroomIdentity(Ref ref, String? identifier) async {
  if (identifier == null) return null;
  final client = ref.watch(apiClientProvider);
  final resp = await client.get('/chat/$identifier/members/me');
  return SnChatMember.fromJson(resp.data);
}

@RoutePage()
class NewChatScreen extends StatelessWidget {
  const NewChatScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return EditChatScreen();
  }
}

@RoutePage()
class EditChatScreen extends HookConsumerWidget {
  final String? id;
  const EditChatScreen({super.key, @PathParam("id") this.id});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final formKey = useMemoized(() => GlobalKey<FormState>(), []);

    final submitting = useState(false);

    final nameController = useTextEditingController();
    final descriptionController = useTextEditingController();
    final picture = useState<SnCloudFile?>(null);
    final background = useState<SnCloudFile?>(null);

    final chat = ref.watch(chatroomProvider(id));

    final joinedRealms = ref.watch(realmsJoinedProvider);
    final currentRealm = useState<SnRealm?>(null);

    useEffect(() {
      if (chat.value != null) {
        nameController.text = chat.value!.name ?? '';
        descriptionController.text = chat.value!.description ?? '';
        picture.value = chat.value!.picture;
        background.value = chat.value!.background;
        currentRealm.value = joinedRealms.value?.firstWhereOrNull(
          (realm) => realm.id == chat.value!.realmId,
        );
      }
      return;
    }, [chat]);

    void setPicture(String position) async {
      showLoadingModal(context);
      var result = await ref
          .read(imagePickerProvider)
          .pickImage(source: ImageSource.gallery);
      if (result == null) {
        if (context.mounted) hideLoadingModal(context);
        return;
      }
      if (!context.mounted) return;
      hideLoadingModal(context);
      result = await cropImage(
        context,
        image: result,
        allowedAspectRatios: [
          if (position == 'background')
            CropAspectRatio(height: 7, width: 16)
          else
            CropAspectRatio(height: 1, width: 1),
        ],
      );
      if (result == null) {
        if (context.mounted) hideLoadingModal(context);
        return;
      }
      if (!context.mounted) return;
      showLoadingModal(context);

      submitting.value = true;
      try {
        final baseUrl = ref.watch(serverUrlProvider);
        final atk = await getFreshAtk(
          ref.watch(tokenPairProvider),
          baseUrl,
          onRefreshed: (atk, rtk) {
            setTokenPair(ref.watch(sharedPreferencesProvider), atk, rtk);
            ref.invalidate(tokenPairProvider);
          },
        );
        if (atk == null) throw ArgumentError('Access token is null');
        final cloudFile =
            await putMediaToCloud(
              fileData: result,
              atk: atk,
              baseUrl: baseUrl,
              filename: result.name,
              mimetype: result.mimeType ?? 'image/jpeg',
            ).future;
        if (cloudFile == null) {
          throw ArgumentError('Failed to upload the file...');
        }
        switch (position) {
          case 'picture':
            picture.value = cloudFile;
          case 'background':
            background.value = cloudFile;
        }
      } catch (err) {
        showErrorAlert(err);
      } finally {
        if (context.mounted) hideLoadingModal(context);
        submitting.value = false;
      }
    }

    Future<void> performAction() async {
      if (!formKey.currentState!.validate()) return;

      submitting.value = true;
      try {
        final client = ref.watch(apiClientProvider);
        final resp = await client.request(
          id == null ? '/chat' : '/chat/$id',
          data: {
            'name': nameController.text,
            'description': descriptionController.text,
            'background_id': background.value?.id,
            'picture_id': picture.value?.id,
            'realm_id': currentRealm.value?.id,
          },
          options: Options(method: id == null ? 'POST' : 'PATCH'),
        );
        if (context.mounted) {
          context.maybePop(SnChatRoom.fromJson(resp.data));
        }
      } catch (err) {
        showErrorAlert(err);
      } finally {
        submitting.value = false;
      }
    }

    return AppScaffold(
      appBar: AppBar(
        title: Text(id == null ? 'createChatRoom' : 'editChatRoom').tr(),
        leading: const PageBackButton(),
      ),
      body: Column(
        children: [
          RealmSelectionDropdown(
            value: currentRealm.value,
            realms: joinedRealms.when(
              data: (realms) => realms,
              loading: () => [],
              error: (_, __) => [],
            ),
            onChanged: (SnRealm? value) {
              currentRealm.value = value;
            },
            isLoading: joinedRealms.isLoading,
            error: joinedRealms.error?.toString(),
          ),
          AspectRatio(
            aspectRatio: 16 / 7,
            child: Stack(
              clipBehavior: Clip.none,
              fit: StackFit.expand,
              children: [
                GestureDetector(
                  child: Container(
                    color: Theme.of(context).colorScheme.surfaceContainerHigh,
                    child:
                        background.value != null
                            ? CloudFileWidget(
                              item: background.value!,
                              fit: BoxFit.cover,
                            )
                            : const SizedBox.shrink(),
                  ),
                  onTap: () {
                    setPicture('background');
                  },
                ),
                Positioned(
                  left: 20,
                  bottom: -32,
                  child: GestureDetector(
                    child: ProfilePictureWidget(
                      fileId: picture.value?.id,
                      radius: 40,
                      fallbackIcon: Symbols.group,
                    ),
                    onTap: () {
                      setPicture('picture');
                    },
                  ),
                ),
              ],
            ),
          ).padding(bottom: 32),
          Form(
            key: formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                TextFormField(
                  controller: nameController,
                  decoration: const InputDecoration(labelText: 'Name'),
                  onTapOutside:
                      (_) => FocusManager.instance.primaryFocus?.unfocus(),
                ),
                const SizedBox(height: 16),
                TextFormField(
                  controller: descriptionController,
                  decoration: const InputDecoration(labelText: 'Description'),
                  minLines: 3,
                  maxLines: null,
                  onTapOutside:
                      (_) => FocusManager.instance.primaryFocus?.unfocus(),
                ),
                const SizedBox(height: 16),
                Align(
                  alignment: Alignment.centerRight,
                  child: TextButton.icon(
                    onPressed: submitting.value ? null : performAction,
                    label: const Text('Save'),
                    icon: const Icon(Symbols.save),
                  ),
                ),
              ],
            ).padding(all: 24),
          ),
        ],
      ),
    );
  }
}

@riverpod
Future<List<SnChatMember>> chatroomInvites(Ref ref) async {
  final client = ref.watch(apiClientProvider);
  final resp = await client.get('/chat/invites');
  return resp.data
      .map((e) => SnChatMember.fromJson(e))
      .cast<SnChatMember>()
      .toList();
}

class _ChatInvitesSheet extends HookConsumerWidget {
  const _ChatInvitesSheet();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final invites = ref.watch(chatroomInvitesProvider);

    Future<void> acceptInvite(SnChatMember invite) async {
      try {
        final client = ref.read(apiClientProvider);
        await client.post('/chat/invites/${invite.chatRoom!.id}/accept');
        ref.invalidate(chatroomInvitesProvider);
        ref.invalidate(chatroomsJoinedProvider);
      } catch (err) {
        showErrorAlert(err);
      }
    }

    Future<void> declineInvite(SnChatMember invite) async {
      try {
        final client = ref.read(apiClientProvider);
        await client.post('/chat/invites/${invite.chatRoom!.id}/decline');
        ref.invalidate(chatroomInvitesProvider);
      } catch (err) {
        showErrorAlert(err);
      }
    }

    return Container(
      constraints: BoxConstraints(
        maxHeight: MediaQuery.of(context).size.height * 0.8,
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          Padding(
            padding: EdgeInsets.only(top: 16, left: 20, right: 16, bottom: 12),
            child: Row(
              children: [
                Text(
                  'invites'.tr(),
                  style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                    fontWeight: FontWeight.w600,
                    letterSpacing: -0.5,
                  ),
                ),
                const Spacer(),
                IconButton(
                  icon: const Icon(Symbols.refresh),
                  style: IconButton.styleFrom(minimumSize: const Size(36, 36)),
                  onPressed: () {
                    ref.invalidate(chatroomInvitesProvider);
                  },
                ),
                IconButton(
                  icon: const Icon(Symbols.close),
                  onPressed: () => Navigator.pop(context),
                  style: IconButton.styleFrom(minimumSize: const Size(36, 36)),
                ),
              ],
            ),
          ),
          const Divider(height: 1),
          Expanded(
            child: invites.when(
              data:
                  (items) =>
                      items.isEmpty
                          ? Center(
                            child:
                                Text(
                                  'invitesEmpty',
                                  textAlign: TextAlign.center,
                                ).tr(),
                          )
                          : ListView.builder(
                            shrinkWrap: true,
                            itemCount: items.length,
                            itemBuilder: (context, index) {
                              final invite = items[index];
                              return ChatRoomListTile(
                                room: invite.chatRoom!,
                                isDirect: invite.chatRoom!.type == 1,
                                subtitle: Row(
                                  spacing: 6,
                                  children: [
                                    Flexible(
                                      child:
                                          Text(
                                            invite.role >= 100
                                                ? 'permissionOwner'
                                                : invite.role >= 50
                                                ? 'permissionModerator'
                                                : 'permissionMember',
                                          ).tr(),
                                    ),
                                    if (invite.chatRoom!.type == 1)
                                      Badge(
                                        label: Text('directMessage').tr(),
                                        backgroundColor:
                                            Theme.of(
                                              context,
                                            ).colorScheme.primary,
                                        textColor:
                                            Theme.of(
                                              context,
                                            ).colorScheme.onPrimary,
                                      ),
                                  ],
                                ),
                                trailing: Row(
                                  mainAxisSize: MainAxisSize.min,
                                  children: [
                                    IconButton(
                                      icon: const Icon(Symbols.check),
                                      onPressed: () => acceptInvite(invite),
                                    ),
                                    IconButton(
                                      icon: const Icon(Symbols.close),
                                      onPressed: () => declineInvite(invite),
                                    ),
                                  ],
                                ),
                              );
                            },
                          ),
              loading: () => const Center(child: CircularProgressIndicator()),
              error: (error, stack) => Center(child: Text('Error: $error')),
            ),
          ),
        ],
      ),
    );
  }
}
