// lib/screens/service_point_select_screen.dart

import "package:flutter/material.dart";
import "../services/api.dart";
import "../models/service_point.dart";

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

  @override
  State<ServicePointSelectScreen> createState() => _ServicePointSelectScreenState();
}

class _ServicePointSelectScreenState extends State<ServicePointSelectScreen> {
  late Future<List<ServicePoint>> _future;

  // MVP HARD CODE
  static const int _mvpBusinessId = 17;

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

  Future<List<ServicePoint>> _load() {
    return Api.listServicePoints(businessId: _mvpBusinessId);
  }

  String _tryGetString(dynamic obj, String field) {
    try {
      final v = obj == null ? null : (obj as dynamic).__getattribute__(field);
      if (v == null) return "";
      final s = v.toString().trim();
      return s;
    } catch (_) {
      // Dart doesn't actually support __getattribute__; this block is never reached in that way.
      // We keep it here because we also attempt direct dynamic access below.
      return "";
    }
  }

  String _nameFor(ServicePoint sp, int index) {
    final d = sp as dynamic;

    // Try common getters without compile-time assumptions.
    try {
      final v = d.servicePointName;
      if (v != null) {
        final s = v.toString().trim();
        if (s.isNotEmpty) return s;
      }
    } catch (_) {}

    try {
      final v = d.name;
      if (v != null) {
        final s = v.toString().trim();
        if (s.isNotEmpty) return s;
      }
    } catch (_) {}

    try {
      final v = d.ServicePointName;
      if (v != null) {
        final s = v.toString().trim();
        if (s.isNotEmpty) return s;
      }
    } catch (_) {}

    try {
      final v = d.SERVICEPOINTNAME;
      if (v != null) {
        final s = v.toString().trim();
        if (s.isNotEmpty) return s;
      }
    } catch (_) {}

    return "Service Point ${index + 1}";
  }

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

          if (snapshot.hasError) {
            return Center(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Text(
                      "Failed to load service points.",
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const SizedBox(height: 8),
                    Text(
                      snapshot.error.toString(),
                      textAlign: TextAlign.center,
                    ),
                    const SizedBox(height: 16),
                    ElevatedButton(
                      onPressed: () => setState(() => _future = _load()),
                      child: const Text("Retry"),
                    ),
                  ],
                ),
              ),
            );
          }

          final items = snapshot.data ?? const <ServicePoint>[];

          if (items.isEmpty) {
            return const Center(child: Text("No service points found."));
          }

          return ListView.separated(
            itemCount: items.length,
            separatorBuilder: (_, __) => const Divider(height: 1),
            itemBuilder: (context, i) {
              final sp = items[i];
              final name = _nameFor(sp, i);

              return ListTile(
                title: Text(name),
                trailing: const Icon(Icons.chevron_right),
                onTap: () {
                  // Return the selected service point to the previous screen.
                  Navigator.of(context).pop<ServicePoint>(sp);
                },
              );
            },
          );
        },
      ),
    );
  }
}