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

import 'api.dart';
import 'screens/albums_screen.dart';
import 'screens/applications_screen.dart';
import 'screens/overview_screen.dart';
import 'screens/sign_in_screen.dart';
import 'screens/singers_screen.dart';
import 'screens/songs_screen.dart';
import 'session.dart';
import 'shell.dart';

final adminRouter = GoRouter(
  refreshListenable: AdminSession.instance,
  redirect: (context, state) {
    final session = AdminSession.instance.state;
    final atSignIn = state.matchedLocation == '/sign-in';
    if (session == SessionState.checking) return null;
    if (session == SessionState.signedOut) {
      return atSignIn ? null : '/sign-in?from=${Uri.encodeComponent(state.uri.toString())}';
    }
    if (atSignIn) return state.uri.queryParameters['from'] ?? '/';
    return null;
  },
  routes: [
    GoRoute(path: '/sign-in', builder: (context, state) => const SignInScreen()),
    ShellRoute(
      builder: (context, state, child) => AdminShell(location: state.matchedLocation, child: child),
      routes: [
        GoRoute(path: '/', pageBuilder: (context, state) => _page(const OverviewScreen())),
        GoRoute(
          path: '/songs',
          pageBuilder: (context, state) {
            final p = state.uri.queryParameters;
            return _page(SongsScreen(
              key: ValueKey(state.uri.toString()),
              filter: SongFilter.fromId(p['show']),
              query: p['q'] ?? '',
              albumId: p['album'],
              artistId: p['singer'],
              filterName: p['name'],
            ));
          },
        ),
        GoRoute(path: '/albums', pageBuilder: (context, state) => _page(const AlbumsScreen())),
        GoRoute(path: '/singers', pageBuilder: (context, state) => _page(const SingersScreen())),
        GoRoute(path: '/applications', pageBuilder: (context, state) => _page(const ApplicationsScreen())),
      ],
    ),
  ],
);

Page<void> _page(Widget child) => NoTransitionPage(child: child);