import 'package:flutter/material.dart';
import '../services/dio_client.dart';
import '../services/invoice_service.dart';

class InvoiceInstallmentScreen extends StatefulWidget {
  final int invoiceId;
  const InvoiceInstallmentScreen({super.key, required this.invoiceId});

  @override
  State<InvoiceInstallmentScreen> createState() =>
      _InvoiceInstallmentScreenState();
}

class _InvoiceInstallmentScreenState extends State<InvoiceInstallmentScreen> {
  bool loading = true;
  List installments = [];

  @override
  void initState() {
    super.initState();
    load();
  }

  Future<void> load() async {
    final service = InvoiceService(DioClient.getInstance(context));
    final res = await service.getInstallments(widget.invoiceId);

    if (res['success'] == true) {
      installments = res['installments'] ?? [];
    }

    loading = false;
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Installments")),
      body: loading
          ? const Center(child: CircularProgressIndicator())
          : installments.isEmpty
          ? const Center(
        child: Text("Installments not created yet",
            style: TextStyle(fontSize: 18)),
      )
          : ListView.builder(
        padding: const EdgeInsets.all(16),
        itemCount: installments.length,
        itemBuilder: (_, i) {
          final inst = installments[i];
          return Card(
            child: ListTile(
              title: Text(
                  "Amount: ₹${inst['amount']?.toString() ?? '0'}"),
              subtitle: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                      "Date: ${inst['installment_date'] ?? 'N/A'}"),
                  Text(
                      "Payment: ${inst['payment_method'] ?? 'N/A'}"),
                  Text(
                      "Reference: ${inst['reference_no'] ?? 'N/A'}"),
                ],
              ),
            ),
          );
        },
      ),
    );
  }
}