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

import '../core/session_controller.dart';
import '../features/auth/login_page.dart';
import '../features/auth/register_page.dart';
import '../features/chat/chat_page.dart';
import '../features/home/home_page.dart';
import '../features/search/search_page.dart';
import '../features/settings/settings_page.dart';
import '../core/app_settings.dart';
import '../theme/toss_theme.dart';

final goRouterProvider = Provider<GoRouter>((ref) {
  ref.watch(sessionProvider);
  ref.watch(themeModeProvider);

  return GoRouter(
    initialLocation: '/splash',
    redirect: (context, state) {
      final async = ref.read(sessionProvider);
      final loc = state.matchedLocation;

      if (async.isLoading) {
        return loc == '/splash' ? null : '/splash';
      }
      if (async.hasError) {
        return loc == '/login' ? null : '/login';
      }
      final s = async.value;
      if (s == null) {
        if (loc == '/login' || loc == '/register') return null;
        return '/login';
      }
      if (loc == '/splash' || loc == '/login' || loc == '/register') {
        return '/';
      }
      return null;
    },
    routes: [
      GoRoute(
        path: '/splash',
        builder: (context, state) => const Scaffold(
          backgroundColor: TossColors.bg,
          body: Center(child: CircularProgressIndicator(color: TossColors.blue)),
        ),
      ),
      GoRoute(
        path: '/login',
        builder: (context, state) => const LoginPage(),
      ),
      GoRoute(
        path: '/register',
        builder: (context, state) => const RegisterPage(),
      ),
      GoRoute(
        path: '/',
        builder: (context, state) => const HomePage(),
      ),
      GoRoute(
        path: '/chat',
        builder: (context, state) {
          final q = state.uri.queryParameters;
          final roomId = q['roomId'];
          final contextId = q['contextId'];
          if (roomId == null || contextId == null) {
            return const Scaffold(body: Center(child: Text('Invalid link')));
          }
          return ChatPage(roomId: roomId, contextId: contextId);
        },
      ),
      GoRoute(
        path: '/search',
        builder: (context, state) {
          final cid = state.uri.queryParameters['contextId'] ?? '';
          return SearchPage(contextId: cid);
        },
      ),
      GoRoute(
        path: '/settings',
        builder: (context, state) => const SettingsPage(),
      ),
    ],
  );
});