import 'package:auto_route/auto_route.dart';
import 'package:croppy/croppy.dart' show CropAspectRatio;
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/file.dart';
import 'package:island/models/realm.dart';
import 'package:island/pods/config.dart';
import 'package:island/pods/network.dart';
import 'package:island/route.gr.dart';
import 'package:island/services/file.dart';
import 'package:island/widgets/alert.dart';
import 'package:island/widgets/app_scaffold.dart';
import 'package:island/widgets/content/cloud_files.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:styled_widget/styled_widget.dart';

part 'realms.g.dart';

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

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

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

    return AppScaffold(
      appBar: AppBar(
        title: const Text('realms').tr(),
        actions: [
          IconButton(
            icon: const Icon(Symbols.email),
            onPressed: () {
              showModalBottomSheet(
                context: context,
                isScrollControlled: true,
                builder: (_) => _RealmInviteSheet(),
              );
            },
          ),
          const Gap(8),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        heroTag: Key("realms-page-fab"),
        child: const Icon(Symbols.add),
        onPressed: () {
          context.router.push(NewRealmRoute());
        },
      ),
      body: RefreshIndicator(
        child: realms.when(
          data:
              (value) => Column(
                children: [
                  Expanded(
                    child: ListView.builder(
                      padding: EdgeInsets.only(
                        bottom: MediaQuery.of(context).padding.bottom,
                      ),
                      itemCount: value.length,
                      itemBuilder: (context, item) {
                        return ListTile(
                          leading: ProfilePictureWidget(
                            fileId: value[item].pictureId,
                            fallbackIcon: Symbols.group,
                          ),
                          title: Text(value[item].name),
                          subtitle: Text(value[item].description),
                          onTap: () {
                            context.router.push(
                              RealmDetailRoute(slug: value[item].slug),
                            );
                          },
                          contentPadding: EdgeInsets.only(left: 16, right: 14),
                        );
                      },
                    ),
                  ),
                ],
              ),
          loading: () => const Center(child: CircularProgressIndicator()),
          error:
              (e, _) => GestureDetector(
                child: Center(
                  child: Text('Error: $e', textAlign: TextAlign.center),
                ),
                onTap: () {
                  ref.invalidate(realmsJoinedProvider);
                },
              ),
        ),
        onRefresh: () => ref.refresh(realmsJoinedProvider.future),
      ),
    );
  }
}

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

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

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

@RoutePage()
class EditRealmScreen extends HookConsumerWidget {
  final String? slug;
  const EditRealmScreen({super.key, @PathParam('slug') this.slug});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final submitting = useState(false);

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

    final slugController = useTextEditingController();
    final nameController = useTextEditingController();
    final descriptionController = useTextEditingController();

    final formKey = useMemoized(GlobalKey<FormState>.new, const []);

    final realm = ref.watch(realmProvider(slug));

    useEffect(() {
      if (realm.value != null) {
        picture.value = realm.value!.picture;
        background.value = realm.value!.background;
        slugController.text = realm.value!.slug;
        nameController.text = realm.value!.name;
        descriptionController.text = realm.value!.description;
      }
      return null;
    }, [realm]);

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

      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 {
        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(
          slug == null ? '/realms' : '/realms/$slug',
          data: {
            'slug': slugController.text,
            'name': nameController.text,
            'description': descriptionController.text,
            'background_id': background.value?.id,
            'picture_id': picture.value?.id,
          },
          options: Options(method: slug == null ? 'POST' : 'PATCH'),
        );
        if (context.mounted) {
          context.maybePop(SnRealm.fromJson(resp.data));
        }
      } catch (err) {
        showErrorAlert(err);
      } finally {
        submitting.value = false;
      }
    }

    return AppScaffold(
      appBar: AppBar(
        title: Text(slug == null ? 'createRealm'.tr() : 'editRealm'.tr()),
        leading: const PageBackButton(),
      ),
      body: Column(
        children: [
          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,
              spacing: 16,
              children: [
                TextFormField(
                  controller: slugController,
                  decoration: InputDecoration(
                    labelText: 'slug'.tr(),
                    helperText: 'slugHint'.tr(),
                  ),
                  onTapOutside:
                      (_) => FocusManager.instance.primaryFocus?.unfocus(),
                ),
                TextFormField(
                  controller: nameController,
                  decoration: InputDecoration(labelText: 'name'.tr()),
                  onTapOutside:
                      (_) => FocusManager.instance.primaryFocus?.unfocus(),
                ),
                TextFormField(
                  controller: descriptionController,
                  decoration: InputDecoration(labelText: 'description'.tr()),
                  minLines: 3,
                  maxLines: null,
                  onTapOutside:
                      (_) => FocusManager.instance.primaryFocus?.unfocus(),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: TextButton.icon(
                    onPressed: submitting.value ? null : performAction,
                    label: Text('saveChanges'.tr()),
                    icon: const Icon(Symbols.save),
                  ),
                ),
              ],
            ).padding(all: 24),
          ),
        ],
      ),
    );
  }
}

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

class _RealmInviteSheet extends HookConsumerWidget {
  const _RealmInviteSheet();

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

    Future<void> acceptInvite(SnRealmMember invite) async {
      try {
        final client = ref.read(apiClientProvider);
        await client.post('/realms/invites/${invite.realm!.id}/accept');
        ref.invalidate(realmInvitesProvider);
        ref.invalidate(realmsJoinedProvider);
      } catch (err) {
        showErrorAlert(err);
      }
    }

    Future<void> declineInvite(SnRealmMember invite) async {
      try {
        final client = ref.read(apiClientProvider);
        await client.post('/realms/invites/${invite.realm!.id}/decline');
        ref.invalidate(realmInvitesProvider);
      } 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(realmInvitesProvider);
                  },
                ),
                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 ListTile(
                                leading: ProfilePictureWidget(
                                  fileId: invite.realm!.pictureId,
                                  radius: 24,
                                  fallbackIcon: Symbols.group,
                                ),
                                title: Text(invite.realm!.name),
                                subtitle:
                                    Text(
                                      invite.role >= 100
                                          ? 'permissionOwner'
                                          : invite.role >= 50
                                          ? 'permissionModerator'
                                          : 'permissionMember',
                                    ).tr(),
                                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')),
            ),
          ),
        ],
      ),
    );
  }
}