import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

import 'core/auth/auth_controller.dart';
import 'features/accounts/accounts_page.dart';
import 'features/cashflow/cashflow_page.dart';
import 'features/categories/categories_page.dart';
import 'features/events/events_page.dart';
import 'features/goals/goals_page.dart';
import 'features/health/health_page.dart';
import 'features/home/home_page.dart';
import 'features/income/income_page.dart';
import 'features/imports/import_preview_page.dart';
import 'features/imports/imports_page.dart';
import 'features/login/login_page.dart';
import 'features/pending/pending_page.dart';
import 'features/portfolio/instrument_page.dart';
import 'features/portfolio/portfolio_page.dart';
import 'features/portfolios/portfolios_page.dart';
import 'features/rebalance/rebalance_page.dart';
import 'features/rules/rules_page.dart';
import 'features/settings/settings_page.dart';
import 'features/shell/analytics_page.dart';
import 'features/shell/app_shell.dart';
import 'features/tax/tax_page.dart';
import 'features/transactions/transactions_page.dart';

/// Where to go after signing in: the page the user was on, if `from` is an in-app path.
String _returnTo(String? from) {
  final inApp = from != null && from.startsWith('/') && !from.startsWith('//');
  return inApp && !from.startsWith('/login') ? from : '/';
}

final routerProvider = Provider<GoRouter>((ref) {
  final auth = ValueNotifier<AuthState>(ref.read(authControllerProvider));
  ref.listen(authControllerProvider, (_, next) => auth.value = next);
  ref.onDispose(auth.dispose);

  return GoRouter(
    initialLocation: '/',
    refreshListenable: auth,
    redirect: (context, state) {
      final status = auth.value.status;
      final atLogin = state.matchedLocation == '/login';
      return switch (status) {
        // A reload starts here while the stored session is still being restored: the address
        // is kept in `from` so signing back in lands on it instead of on the home page. A
        // deliberate sign-out is `signedOut` from the start and carries no `from`.
        AuthStatus.unknown =>
          atLogin
              ? null
              : Uri(
                  path: '/login',
                  queryParameters: {'from': state.uri.toString()},
                ).toString(),
        AuthStatus.signedOut => atLogin ? null : '/login',
        AuthStatus.signedIn =>
          atLogin ? _returnTo(state.uri.queryParameters['from']) : null,
      };
    },
    routes: [
      GoRoute(path: '/login', builder: (_, _) => const LoginPage()),
      ShellRoute(
        builder: (context, state, child) =>
            AppShell(location: state.matchedLocation, child: child),
        routes: [
          GoRoute(path: '/', builder: (_, _) => const HomePage()),
          GoRoute(path: '/accounts', builder: (_, _) => const AccountsPage()),
          GoRoute(path: '/portfolio', builder: (_, _) => const PortfolioPage()),
          GoRoute(
            path: '/portfolio/instrument/:id',
            builder: (_, state) => InstrumentPage(
              instrumentId: int.parse(state.pathParameters['id']!),
            ),
          ),
          // Аналитика: one navigation destination, four contract routes. The hub is what
          // the shell points at; each screen below keeps its own top-level path and stays
          // deep-linkable (see `alsoMatches` in `app_shell.dart`).
          GoRoute(
            path: '/analytics',
            builder: (_, _) => const AnalyticsHubPage(),
          ),
          GoRoute(path: '/income', builder: (_, _) => const IncomePage()),
          GoRoute(
            path: '/portfolios',
            builder: (_, _) => const PortfoliosPage(),
          ),
          GoRoute(path: '/rebalance', builder: (_, _) => const RebalancePage()),
          GoRoute(path: '/goals', builder: (_, _) => const GoalsPage()),
          GoRoute(path: '/tax', builder: (_, _) => const TaxPage()),
          GoRoute(path: '/events', builder: (_, _) => const EventsPage()),
          GoRoute(path: '/imports', builder: (_, _) => const ImportsPage()),
          GoRoute(
            path: '/imports/:id',
            builder: (_, state) => ImportPreviewPage(
              importId: int.parse(state.pathParameters['id']!),
            ),
          ),
          GoRoute(
            path: '/instruments/pending',
            builder: (_, _) => const PendingInstrumentsPage(),
          ),
          GoRoute(path: '/cashflow', builder: (_, _) => const CashflowPage()),
          GoRoute(
            path: '/categories',
            builder: (_, state) => CategoriesPage(
              initialMonth: state.uri.queryParameters['month'],
            ),
          ),
          GoRoute(
            path: '/transactions',
            builder: (_, _) => const TransactionsPage(),
          ),
          GoRoute(path: '/rules', builder: (_, _) => const RulesPage()),
          GoRoute(
            path: '/health',
            builder: (_, state) => HealthPage(
              initialTab: state.uri.queryParameters['tab'] == 'quality' ? 1 : 0,
            ),
          ),
          GoRoute(path: '/settings', builder: (_, _) => const SettingsPage()),
        ],
      ),
    ],
  );
});