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

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

  @override
  State<InvoiceDetailScreen> createState() => _InvoiceDetailScreenState();
}

class _InvoiceDetailScreenState extends State<InvoiceDetailScreen> {
  bool loading = true;
  Map invoice = {};

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

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

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

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

  /// ---------- REUSABLE ROW ----------
  Widget row(String label, dynamic value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(label, style: const TextStyle(fontSize: 14, color: Colors.grey)),
          Expanded(
            child: Text(
              value?.toString().isNotEmpty == true ? value.toString() : "N/A",
              textAlign: TextAlign.end,
              style: const TextStyle(
                fontSize: 15,
                fontWeight: FontWeight.w600,
              ),
            ),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Invoice Details")),
      body: loading
          ? const Center(child: CircularProgressIndicator())

      /// ================ INVOICE DATA ================
          : Padding(
        padding: const EdgeInsets.all(16),
        child: ListView(
          children: [
            /// -------- Invoice Summary --------
            const Text(
              "Invoice Summary",
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 10),

            row("Invoice No", invoice['invoice_number']),
            row("Invoice Date", invoice['invoice_date']),
            row("Due Date", invoice['due_date']),
            row("Status", invoice['status']),

            const Divider(height: 30),

            /// -------- Customer Details --------
            const Text(
              "Customer Details",
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 10),

            row("Name", invoice['customer_name']),
            row("Company", invoice['company_name']),
            row("Email", invoice['customer_email']),
            row("Mobile", invoice['customer_mobile']),
            row("Address", invoice['customer_address']),
            row("Pincode", invoice['pincode']),

            const Divider(height: 30),

            /// -------- Amounts & Taxes --------
            const Text(
              "Amounts",
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 10),

            row("Final Amount", invoice['final_amount']),
            row("Tax Type", invoice['tax_type']),
            row("GST %", invoice['gst_percent']),
            row("GST Amount", invoice['gst_amount']),
            row("Final with GST", invoice['final_amount_with_gst']),

            const Divider(height: 30),

            /// -------- Payment Details --------
            const Text(
              "Payment Details",
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
            ),
            const SizedBox(height: 10),

            row("Payment Method", invoice['payment_method']),
            row("Reference No", invoice['reference_no']),
            row("Notes", invoice['notes']),

            const Divider(height: 30),

            /// -------- PDF --------
            if (invoice['pdf_path'] != null)
              ElevatedButton.icon(
                icon: const Icon(Icons.picture_as_pdf),
                label: const Text("Download PDF"),
                onPressed: () {},
                style:
                ElevatedButton.styleFrom(backgroundColor: Colors.red),
              ),

            const SizedBox(height: 20),

            /// -------- Invoice Items --------
            if (invoice['items'] != null)
              const Text(
                "Invoice Items",
                style:
                TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
              ),
            const SizedBox(height: 10),

            ...List.generate(invoice['items']?.length ?? 0, (i) {
              final item = invoice['items'][i];
              return Card(
                child: ListTile(
                  title: Text(item['description'] ?? "Item"),
                  subtitle: Text("Qty: ${item['qty'] ?? 0}"),
                  trailing: Text(
                    "₹${item['ttl_amount'] ?? 0}",
                    style: const TextStyle(
                        fontWeight: FontWeight.bold,
                        color: Colors.indigo),
                  ),
                ),
              );
            }),
          ],
        ),
      ),
    );
  }
}