// lib/screens/service_point_select_screen.dart

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

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

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

class _ServicePointSelectScreenState extends State<ServicePointSelectScreen> {
  Future<List<ServicePoint>>? _future;
  int? _businessId;
  int? _userId;

  int? _asIntNullable(dynamic v) {
    if (v == null) return null;
    if (v is int) return v;
    if (v is num) return v.toInt();
    if (v is String) {
      final s = v.trim();
      if (s.isEmpty) return null;
      return int.tryParse(s);
    }
    return null;
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();

    final args = ModalRoute.of(context)?.settings.arguments;
    if (args is Map) {
      final b = _asIntNullable(args["BusinessID"]) ?? _asIntNullable(args["businessId"]);
      final u = _asIntNullable(args["UserID"]) ?? _asIntNullable(args["userId"]);

      if (_businessId != b || _userId != u || _future == null) {
        _businessId = b;
        _userId = u;

        if (_businessId != null && _businessId! > 0) {
          _future = Api.listServicePoints(businessId: _businessId!);
        } else {
          _future = Future.value(<ServicePoint>[]);
        }
      }
    } else {
      // No args at all
      _businessId = null;
      _userId = null;
      _future = Future.value(<ServicePoint>[]);
    }
  }

  @override
  Widget build(BuildContext context) {
    final businessId = _businessId;

    return Scaffold(
      appBar: AppBar(title: const Text("Select Service Point")),
      body: (businessId == null || businessId <= 0)
          ? const Padding(
              padding: EdgeInsets.all(16),
              child: Text("Missing route arguments: BusinessID"),
            )
          : FutureBuilder<List<ServicePoint>>(
              future: _future,
              builder: (context, snapshot) {
                if (snapshot.connectionState == ConnectionState.waiting) {
                  return const Center(child: CircularProgressIndicator());
                }

                if (snapshot.hasError) {
                  return Padding(
                    padding: const EdgeInsets.all(16),
                    child: Text(snapshot.error.toString()),
                  );
                }

                final items = snapshot.data ?? const <ServicePoint>[];
                if (items.isEmpty) {
                  return const Padding(
                    padding: EdgeInsets.all(16),
                    child: Text("No service points returned."),
                  );
                }

                return ListView.separated(
                  itemCount: items.length,
                  separatorBuilder: (_, __) => const Divider(height: 1),
                  itemBuilder: (context, i) {
                    final sp = items[i];
                    return ListTile(
                      title: Text(sp.name),
                      subtitle: Text("ID: ${sp.servicePointId}"),
                      trailing: const Icon(Icons.chevron_right),
                      onTap: () {
                        // Return selection to the caller.
                        Navigator.of(context).pop<ServicePoint>(sp);
                      },
                    );
                  },
                );
              },
            ),
    );
  }
}