// lib/screens/restaurant_select_screen.dart

import "package:flutter/material.dart";
import "package:provider/provider.dart";

import "../app/app_router.dart";
import "../app/app_state.dart";
import "../models/restaurant.dart";
import "../models/service_point.dart";
import "../services/api.dart";

class RestaurantSelectScreen extends StatefulWidget {
  const RestaurantSelectScreen({super.key});

  @override
  State<RestaurantSelectScreen> createState() => _RestaurantSelectScreenState();
}

class _RestaurantSelectScreenState extends State<RestaurantSelectScreen> {
  late Future<List<Restaurant>> _future;
  String? _debugLastRaw;
  int? _debugLastStatus;

  @override
  void initState() {
    super.initState();
    _future = _load();
  }

  Future<List<Restaurant>> _load() async {
    final raw = await Api.listRestaurantsRaw();
    _debugLastRaw = raw.rawBody;
    _debugLastStatus = raw.statusCode;
    return Api.listRestaurants();
  }

  Future<void> _selectBusinessAndContinue(Restaurant r) async {
    // Set selected business
    context.read<AppState>().setBusiness(r.businessId);

    // Go pick service point, and WAIT for a selection.
    final sp = await Navigator.of(context).pushNamed(
      AppRoutes.servicePointSelect,
    );

    if (!mounted) return;

    if (sp is ServicePoint) {
      // We have a service point selection.
      // TODO: If AppState has a setter for service point, set it here.
      // Example (only if it exists): context.read<AppState>().setServicePoint(sp);

      // Navigate forward to your next screen.
      // If your router has a specific route const, use it here.
      // The most likely is AppRoutes.orderHome.
      try {
        Navigator.of(context).pushNamed(AppRoutes.orderHome);
      } catch (_) {
        // If orderHome route doesn't exist yet, do nothing.
        // (Still fixed: we no longer "just bounce back" with no forward action.)
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Select Business"),
      ),
      body: FutureBuilder<List<Restaurant>>(
        future: _future,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }

          if (snapshot.hasError) {
            return _ErrorPane(
              title: "Businesses Load Failed",
              message: "${snapshot.error}",
              statusCode: _debugLastStatus,
              raw: _debugLastRaw,
              onRetry: () => setState(() => _future = _load()),
            );
          }

          final items = snapshot.data ?? const <Restaurant>[];
          if (items.isEmpty) {
            return _ErrorPane(
              title: "No Businesses Returned",
              message: "The API returned an empty list.",
              statusCode: _debugLastStatus,
              raw: _debugLastRaw,
              onRetry: () => setState(() => _future = _load()),
            );
          }

          return ListView.separated(
            itemCount: items.length,
            separatorBuilder: (_, __) => const Divider(height: 1),
            itemBuilder: (context, i) {
              final r = items[i];
              return ListTile(
                title: Text(r.name),
                trailing: const Icon(Icons.chevron_right),
                onTap: () => _selectBusinessAndContinue(r),
              );
            },
          );
        },
      ),
    );
  }
}

class _ErrorPane extends StatelessWidget {
  final String title;
  final String message;
  final int? statusCode;
  final String? raw;
  final VoidCallback onRetry;

  const _ErrorPane({
    required this.title,
    required this.message,
    required this.statusCode,
    required this.raw,
    required this.onRetry,
  });

  @override
  Widget build(BuildContext context) {
    final rawText = raw ?? "(no body captured)";
    final showRaw = rawText.isNotEmpty;

    return SingleChildScrollView(
      child: Center(
        child: Padding(
          padding: const EdgeInsets.all(18),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(title, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w800)),
              const SizedBox(height: 10),
              Text(message, textAlign: TextAlign.center),
              const SizedBox(height: 10),
              Text("HTTP Status: ${statusCode ?? "-"}", textAlign: TextAlign.center),
              const SizedBox(height: 14),
              if (showRaw) ...[
                const Text("Raw Response:", style: TextStyle(fontWeight: FontWeight.w700)),
                const SizedBox(height: 6),
                Container(
                  width: double.infinity,
                  padding: const EdgeInsets.all(12),
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.white24),
                    borderRadius: BorderRadius.circular(10),
                  ),
                  child: Text(
                    rawText,
                    style: const TextStyle(fontFamily: "monospace", fontSize: 12),
                  ),
                ),
                const SizedBox(height: 14),
              ],
              FilledButton(
                onPressed: onRetry,
                child: const Text("Retry"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}