import 'dart:io';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:share_plus/share_plus.dart';

import '../services/dio_client.dart';
import '../services/invoice_service.dart';
import '../widgets/invoice_detail_view.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();
  }

  // -------------------------------------------------------
  // ⭐ LOAD INVOICE FROM API
  // -------------------------------------------------------
  Future<void> load() async {
    final service = InvoiceService(DioClient.getInstance(context));
    try {
      final res = await service.getInvoiceDetails(widget.invoiceId);

      if (res['success'] == true) {
        invoice = res['invoice'] ?? {};
      } else {
        invoice = {};
      }
    } catch (e) {
      invoice = {};
    } finally {
      if (mounted) setState(() => loading = false);
    }
  }

  // -------------------------------------------------------
  // ⭐ GENERATE + SAVE PDF TO DOWNLOADS FOLDER
  // (No Permission Needed)
  // -------------------------------------------------------
  Future<File> generatePDF() async {
    final pdf = pw.Document();

    pdf.addPage(
      pw.Page(
        build: (context) => pw.Column(
          crossAxisAlignment: pw.CrossAxisAlignment.start,
          children: [
            pw.Text(
              "INVOICE DETAILS",
              style: pw.TextStyle(fontSize: 26, fontWeight: pw.FontWeight.bold),
            ),
            pw.SizedBox(height: 20),

            pw.Text("Invoice ID: ${invoice['id'] ?? '-'}"),
            pw.Text("Amount: ₹${invoice['amount'] ?? '-'}"),
            pw.Text("Status: ${invoice['status'] ?? '-'}"),
            pw.Text("Date: ${invoice['date'] ?? '-'}"),
            pw.Text("Customer: ${invoice['customer_name'] ?? '-'}"),
          ],
        ),
      ),
    );

    // ⭐ SAFEST WAY (Android 10–14)
    final downloadsDir = await getDownloadsDirectory();

    final filePath = "${downloadsDir!.path}/invoice_${invoice['id']}.pdf";
    final file = File(filePath);

    await file.writeAsBytes(await pdf.save());

    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text("PDF saved to Downloads:\n$filePath")),
      );
    }

    return file;
  }

  // -------------------------------------------------------
  // ⭐ SHARE THE SAVED PDF FILE
  // -------------------------------------------------------
  Future<void> sharePDF() async {
    final file = await generatePDF();

    await Share.shareXFiles(
      [XFile(file.path)],
      text: "Invoice Details",
    );
  }

  @override
  Widget build(BuildContext context) {
    final width = MediaQuery.of(context).size.width;
    final scale = (width / 430).clamp(0.88, 1.08);

    return Scaffold(
      appBar: AppBar(
        title: Text(
          "Invoice Details",
          style: TextStyle(
            fontSize: 18 * scale,
            fontWeight: FontWeight.w600,
          ),
        ),

        // ⭐ PDF + SHARE BUTTONS
        actions: [
          IconButton(
            icon: const Icon(Icons.picture_as_pdf),
            onPressed: generatePDF,
          ),
          IconButton(
            icon: const Icon(Icons.share),
            onPressed: sharePDF,
          ),
        ],
      ),

      body: loading
          ? const Center(child: CircularProgressIndicator())
          : invoice.isEmpty
          ? Center(
        child: Text(
          "No Invoice Data Found",
          style: TextStyle(
            fontSize: 18 * scale,
            fontWeight: FontWeight.w600,
            color: Colors.black87,
          ),
        ),
      )
          : Padding(
        padding: EdgeInsets.all(12 * scale),
        child: InvoiceDetailView(invoice: invoice),
      ),
    );
  }
}