import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:gap/gap.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:island/models/realm.dart';
import 'package:island/pods/network.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/content/sheet.dart';
import 'package:island/widgets/response.dart';
import 'package:material_symbols_icons/symbols.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:styled_widget/styled_widget.dart';
import 'package:island/widgets/realm/realm_list_tile.dart';
import 'package:island/widgets/extended_refresh_indicator.dart';

part 'realms.g.dart';

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

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

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

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

    return AppScaffold(
      isNoBackground: false,
      appBar: AppBar(
        title: const Text('realms').tr(),
        actions: [
          IconButton(
            icon: const Icon(Symbols.travel_explore),
            onPressed: () => context.pushNamed('discoveryRealms'),
          ),
          IconButton(
            icon: Badge(
              label: Text(
                realmInvites.when(
                  data: (invites) => invites.length.toString(),
                  error: (_, _) => '0',
                  loading: () => '0',
                ),
              ),
              isLabelVisible: realmInvites.when(
                data: (invites) => invites.isNotEmpty,
                error: (_, _) => false,
                loading: () => false,
              ),
              child: const Icon(Symbols.email),
            ),
            onPressed: () {
              showModalBottomSheet(
                context: context,
                isScrollControlled: true,
                useRootNavigator: true,
                builder: (_) => const _RealmInviteSheet(),
              );
            },
          ),
          const Gap(8),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        heroTag: const Key("realms-page-fab"),
        child: const Icon(Symbols.add),
        onPressed: () {
          context.pushNamed('realmNew').then((value) {
            if (value != null) {
              ref.invalidate(realmsJoinedProvider);
            }
          });
        },
      ),
      body: ExtendedRefreshIndicator(
        child: realms.when(
          data:
              (value) => Column(
                children: [
                  Expanded(
                    child: ListView.separated(
                      padding: EdgeInsets.only(
                        top: 8,
                        bottom: MediaQuery.of(context).padding.bottom + 8,
                      ),
                      itemCount: value.length,
                      itemBuilder: (context, item) {
                        return ConstrainedBox(
                          constraints: const BoxConstraints(maxWidth: 540),
                          child: RealmListTile(realm: value[item]),
                        ).padding(horizontal: 8).center();
                      },
                      separatorBuilder: (_, _) => const Gap(8),
                    ),
                  ),
                ],
              ),
          loading: () => const Center(child: CircularProgressIndicator()),
          error:
              (e, _) => ResponseErrorWidget(
                error: e,
                onRetry: () => ref.invalidate(realmsJoinedProvider),
              ),
        ),
        onRefresh: () => ref.refresh(realmsJoinedProvider.future),
      ),
    );
  }
}

@riverpod
Future<List<SnRealmMember>> realmInvites(Ref ref) async {
  final client = ref.watch(apiClientProvider);
  final resp = await client.get('/sphere/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(
          '/sphere/realms/invites/${invite.realm!.slug}/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(
          '/sphere/realms/invites/${invite.realm!.slug}/decline',
        );
        ref.invalidate(realmInvitesProvider);
      } catch (err) {
        showErrorAlert(err);
      }
    }

    return SheetScaffold(
      titleText: 'invites'.tr(),
      actions: [
        IconButton(
          icon: const Icon(Symbols.refresh),
          style: IconButton.styleFrom(minimumSize: const Size(36, 36)),
          onPressed: () {
            ref.invalidate(realmInvitesProvider);
          },
        ),
      ],
      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!.picture?.id,
                            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, _) => ResponseErrorWidget(
              error: error,
              onRetry: () => ref.invalidate(realmInvitesProvider),
            ),
      ),
    );
  }
}