import 'package:flutter/cupertino.dart';
import 'package:please_pay_me/core/branding/app_brand.dart';
import 'package:please_pay_me/core/legal/legal_links.dart';
import 'package:please_pay_me/features/auth/session_controller.dart';
import 'package:please_pay_me/features/budgets/budgets_controller.dart';
import 'package:please_pay_me/features/journal/journal_controller.dart';
import 'package:please_pay_me/features/work/jobs_controller.dart';
import 'package:please_pay_me/theme/theme.dart';
import 'package:please_pay_me/ui/ui.dart';
import 'package:provider/provider.dart';

class ProfileScreen extends StatelessWidget {
  const ProfileScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final session = context.watch<SessionController>();
    final user = session.user;

    return CupertinoPageScaffold(
      backgroundColor: AppColors.of(context, AppColors.groupedBackground),
      child: CustomScrollView(
        physics: const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),
        slivers: [
          const AppLargeNavBar(title: 'Профиль'),
          SliverToBoxAdapter(
            child: Padding(
              padding: const EdgeInsets.fromLTRB(
                AppSpacing.gutter,
                AppSpacing.s2,
                AppSpacing.gutter,
                AppSpacing.s5,
              ),
              child: Row(
                children: [
                  AppAvatar(
                    initials: user?.initials,
                    imageUrl: user?.photoUrl,
                    radius: 32,
                  ),
                  const SizedBox(width: AppSpacing.s4),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        AppText.title(user?.displayName ?? 'Гость'),
                        AppText.subhead(user?.handle ?? 'не авторизован'),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
          SliverToBoxAdapter(
            child: AppListSection(
              header: 'Подключение',
              footer: session.isDemo
                  ? 'Демо-режим: данные живут только в памяти устройства.'
                  : 'Данные синхронизируются с веб-кабинетом «${AppBrand.name}».',
              separatorIndent: 60,
              children: [
                AppListTile(
                  leading: AppIconBadge(
                    icon: session.isDemo
                        ? CupertinoIcons.wrench_fill
                        : CupertinoIcons.cloud_fill,
                    color: session.isDemo ? AppColors.systemOrange : AppColors.systemGreen,
                  ),
                  title: 'Режим',
                  value: session.isDemo ? 'Демо' : 'Сервер',
                  showChevron: false,
                ),
                if (!session.isDemo)
                  AppListTile(
                    leading: const AppIconBadge(
                      icon: CupertinoIcons.link,
                      color: AppColors.systemGray,
                    ),
                    title: 'Адрес API',
                    subtitle: session.baseUrl,
                    showChevron: false,
                  ),
              ],
            ),
          ),
          const SliverToBoxAdapter(child: SizedBox(height: AppSpacing.s5)),
          SliverToBoxAdapter(
            child: AppListSection(
              header: 'Оформление',
              footer: 'Системная повторяет тему устройства.',
              children: [
                Padding(
                  padding: const EdgeInsets.fromLTRB(
                    AppSpacing.s3,
                    AppSpacing.s3,
                    AppSpacing.s3,
                    AppSpacing.s3,
                  ),
                  child: AppSegmentedControl(
                    padding: EdgeInsets.zero,
                    labels: const ['Системная', 'Светлая', 'Тёмная'],
                    index: context.watch<ThemeController>().preference.index,
                    onChanged: (index) {
                      context.read<ThemeController>().setPreference(
                            ThemePreference.values[index],
                          );
                    },
                  ),
                ),
              ],
            ),
          ),
          const SliverToBoxAdapter(child: SizedBox(height: AppSpacing.s5)),
          SliverToBoxAdapter(
            child: AppListSection(
              separatorIndent: 60,
              children: [
                AppListTile(
                  leading: const AppIconBadge(
                    icon: CupertinoIcons.arrow_clockwise,
                    color: AppColors.accent,
                  ),
                  title: 'Обновить данные',
                  onTap: () => _refreshAll(context),
                ),
              ],
            ),
          ),
          const SliverToBoxAdapter(child: SizedBox(height: AppSpacing.s5)),
          SliverToBoxAdapter(
            child: AppListSection(
              header: 'Правовая информация',
              footer: 'Открывается веб-версия на please-pay-me.ru.',
              separatorIndent: 60,
              children: [
                AppListTile(
                  leading: const AppIconBadge(
                    icon: CupertinoIcons.doc_text,
                    color: AppColors.accent,
                  ),
                  title: 'Пользовательское соглашение',
                  onTap: () => openLegalDocument(
                    context,
                    LegalLinks.resolve(session.webCabinetUrl, LegalLinks.offer),
                  ),
                ),
                AppListTile(
                  leading: const AppIconBadge(
                    icon: CupertinoIcons.lock_shield,
                    color: AppColors.systemGray,
                  ),
                  title: 'Политика конфиденциальности',
                  onTap: () => openLegalDocument(
                    context,
                    LegalLinks.resolve(session.webCabinetUrl, LegalLinks.privacy),
                  ),
                ),
                AppListTile(
                  leading: const AppIconBadge(
                    icon: CupertinoIcons.checkmark_shield,
                    color: AppColors.systemGray,
                  ),
                  title: 'Согласие на обработку данных',
                  onTap: () => openLegalDocument(
                    context,
                    LegalLinks.resolve(session.webCabinetUrl, LegalLinks.consent),
                  ),
                ),
                AppListTile(
                  leading: const AppIconBadge(
                    icon: CupertinoIcons.circle_grid_hex,
                    color: AppColors.systemGray,
                  ),
                  title: 'Политика cookie',
                  onTap: () => openLegalDocument(
                    context,
                    LegalLinks.resolve(session.webCabinetUrl, LegalLinks.cookies),
                  ),
                ),
              ],
            ),
          ),
          const SliverToBoxAdapter(child: SizedBox(height: AppSpacing.s5)),
          SliverToBoxAdapter(
            child: AppListSection(
              footer: '${AppBrand.name} · версия 0.1.0',
              children: [
                AppListTile(
                  title: 'Выйти',
                  destructive: true,
                  showChevron: false,
                  onTap: () => _signOut(context, session),
                ),
              ],
            ),
          ),
          const SliverToBoxAdapter(child: SizedBox(height: AppSpacing.s7)),
        ],
      ),
    );
  }

  Future<void> _refreshAll(BuildContext context) async {
    await Future.wait([
      context.read<BudgetsController>().load(silent: true),
      context.read<JournalController>().load(silent: true),
      context.read<JobsController>().load(silent: true),
    ]);

    if (context.mounted) {
      await showAppToast(context, message: 'Данные обновлены');
    }
  }

  Future<void> _signOut(BuildContext context, SessionController session) async {
    final confirmed = await showAppAlert(
      context: context,
      title: 'Выйти из аккаунта?',
      message: 'Токен будет удалён с устройства.',
      confirmLabel: 'Выйти',
      cancelLabel: 'Отмена',
      destructive: true,
    );

    if (confirmed == true) await session.signOut();
  }
}