Prisma/lib/app/router.dart

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

import '../backend/backend.dart';
import '../features/artists/presentation/artist_posts_screen.dart';
import '../features/artists/presentation/artists_screen.dart';
import '../features/collections/presentation/collection_details_screen.dart';
import '../features/collections/presentation/collections_screen.dart';
import '../features/favorites/presentation/favorites_screen.dart';
import '../features/feed/presentation/feed_screen.dart';
import '../features/post/presentation/post_details_screen.dart';
import '../features/post/presentation/similar_posts_screen.dart';
import '../features/providers/presentation/provider_check_screen.dart';
import '../features/providers/presentation/provider_form_screen.dart';
import '../features/providers/presentation/providers_screen.dart';
import '../features/search/presentation/search_screen.dart';
import '../features/settings/presentation/hidden_posts_screen.dart';
import '../features/settings/presentation/settings_screen.dart';
import '../features/viewed/presentation/viewed_screen.dart';
import '../shared/widgets/app_shell.dart';

final appRouterProvider = Provider<GoRouter>((ref) {
  return GoRouter(
    initialLocation: '/',
    routes: [
      ShellRoute(
        builder: (context, state, child) => AppShell(child: child),
        routes: [
          GoRoute(
            path: '/',
            pageBuilder: (context, state) => _transitionPage(
              state,
              child: FeedScreen(initialQuery: state.uri.queryParameters['q']),
            ),
          ),
          GoRoute(
            path: '/search',
            builder: (context, state) => const SearchScreen(),
          ),
          GoRoute(
            path: '/post/:providerId/:postId',
            builder: (context, state) {
              final extra = state.extra;
              final Post? initialPost;
              final List<Post>? postsList;
              if (extra is PostNavigationContext) {
                initialPost = extra.currentPost;
                postsList = extra.posts;
              } else if (extra is Post) {
                initialPost = extra;
                postsList = null;
              } else {
                initialPost = null;
                postsList = null;
              }
              return PostDetailsScreen(
                providerId: state.pathParameters['providerId']!,
                postId: state.pathParameters['postId']!,
                initialPost: initialPost,
                postsList: postsList,
              );
            },
          ),
          GoRoute(
            path: '/post/:providerId/:postId/similar',
            builder: (context, state) => SimilarPostsScreen(
              providerId: state.pathParameters['providerId']!,
              postId: state.pathParameters['postId']!,
              initialPost: state.extra is Post ? state.extra! as Post : null,
            ),
          ),
          GoRoute(
            path: '/favorites',
            builder: (context, state) => const FavoritesScreen(),
          ),
          GoRoute(
            path: '/viewed',
            builder: (context, state) => const ViewedScreen(),
          ),
          GoRoute(
            path: '/collections',
            builder: (context, state) => const CollectionsScreen(),
          ),
          GoRoute(
            path: '/collections/:collectionId',
            builder: (context, state) => CollectionDetailsScreen(
              collectionId: state.pathParameters['collectionId']!,
            ),
          ),
          GoRoute(
            path: '/artists',
            builder: (context, state) => const ArtistsScreen(),
          ),
          GoRoute(
            path: '/artists/:providerId/:service/:artistId',
            builder: (context, state) => ArtistPostsScreen(
              providerId: state.pathParameters['providerId']!,
              service: state.pathParameters['service']!,
              artistId: state.pathParameters['artistId']!,
              artistName: state.uri.queryParameters['name'] ??
                  state.pathParameters['artistId']!,
            ),
          ),
          GoRoute(
            path: '/providers',
            builder: (context, state) => const ProvidersScreen(),
          ),
          GoRoute(
            path: '/providers/new',
            builder: (context, state) => ProviderFormScreen(
              initialConfig: state.extra is ContentProviderConfig
                  ? state.extra! as ContentProviderConfig
                  : null,
            ),
          ),
          GoRoute(
            path: '/providers/check',
            builder: (context, state) => const ProviderCheckScreen(),
          ),
          GoRoute(
            path: '/settings',
            builder: (context, state) => const SettingsScreen(),
          ),
          GoRoute(
            path: '/settings/hidden',
            builder: (context, state) => const HiddenPostsScreen(),
          ),
        ],
      ),
    ],
  );
});

CustomTransitionPage<void> _transitionPage(
  GoRouterState state, {
  required Widget child,
}) {
  return CustomTransitionPage<void>(
    key: state.pageKey,
    child: child,
    transitionDuration: const Duration(milliseconds: 180),
    reverseTransitionDuration: const Duration(milliseconds: 140),
    transitionsBuilder: (context, animation, secondaryAnimation, child) {
      final curve = CurvedAnimation(
        parent: animation,
        curve: Curves.easeOutCubic,
        reverseCurve: Curves.easeInCubic,
      );
      return FadeTransition(
        opacity: curve,
        child: SlideTransition(
          position: Tween<Offset>(
            begin: const Offset(0.015, 0),
            end: Offset.zero,
          ).animate(curve),
          child: child,
        ),
      );
    },
  );
}