import 'package:flutter/material.dart';
import 'package:cashumit/models/local_receipt.dart';
import 'package:cashumit/models/group_submission_result.dart';
import 'package:cashumit/services/local_receipt_service.dart';
import 'package:cashumit/services/receipt_service.dart';
import 'package:cashumit/widgets/transaction_submission_dialog.dart';
import 'package:cashumit/widgets/transaction_links_dialog.dart';
import 'package:intl/intl.dart';
import 'package:provider/provider.dart';
import 'package:cashumit/providers/receipt_provider.dart';

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

  @override
  State<LocalReceiptsScreen> createState() => _LocalReceiptsScreenState();
}

class _LocalReceiptsScreenState extends State<LocalReceiptsScreen> {
  List<LocalReceipt> receipts = [];
  bool isLoading = true;

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

  Future<void> _loadReceipts() async {
    setState(() {
      isLoading = true;
    });
    try {
      final loadedReceipts = await LocalReceiptService.getReceipts();
      setState(() {
        receipts = loadedReceipts;
        isLoading = false;
      });
    } catch (e) {
      setState(() {
        isLoading = false;
      });
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal memuat daftar nota: $e')),
        );
      }
    }
  }

  Future<void> _submitAllReceipts() async {
    final credentials = await ReceiptService.loadCredentials();
    if (credentials == null) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(
            content: Text(
                'Silakan konfigurasi kredensial FireFly III terlebih dahulu'),
          ),
        );
      }
      return;
    }

    final unsubmitted = receipts.where((r) => !r.isSubmitted).toList();
    if (unsubmitted.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Tidak ada nota yang belum dikirim')),
        );
      }
      return;
    }

    // Bangun tasks dari semua nota yang belum tersubmit
    final tasks = ReceiptService.buildTasksFromAllUnsubmittedReceipts(unsubmitted);
    if (tasks.isEmpty) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Tidak ada task valid untuk dikirim')),
        );
      }
      return;
    }

    final baseUrl = credentials['url']!;
    final accessToken = credentials['token']!;

    // Tampilkan popup pengiriman
    final results = await showDialog<List<GroupSubmissionResult>>(
      context: context,
      barrierDismissible: false,
      builder: (context) => TransactionSubmissionDialog(
        tasks: tasks,
        baseUrl: baseUrl,
        accessToken: accessToken,
      ),
    );

    if (results == null || !mounted) return;

    // Post-process: kelompokkan hasil per receipt, update status
    await _processBatchResults(results, unsubmitted, baseUrl);

    await _loadReceipts();
  }

  /// Proses hasil batch: update tiap receipt berdasarkan task results.
  Future<void> _processBatchResults(
    List<GroupSubmissionResult> results,
    List<LocalReceipt> unsubmitted,
    String baseUrl,
  ) async {
    int totalSuccess = 0;
    int totalFailure = 0;

    for (final receipt in unsubmitted) {
      // Ambil semua hasil untuk receipt ini
      final prefix = '${receipt.id}_';
      final receiptResults =
          results.where((r) => r.groupId.startsWith(prefix)).toList();

      if (receiptResults.isEmpty) continue;

      final successes =
          receiptResults.where((r) => r.isSuccess).toList();
      final failures =
          receiptResults.where((r) => r.isFailed).toList();

      // Kumpulkan transaction IDs yang berhasil
      final txIds = successes
          .where((r) => r.transactionId != null)
          .map((r) => r.transactionId!)
          .toList();
      final txUrls =
          txIds.map((id) => '$baseUrl/transactions/show/$id').toList();

      if (failures.isEmpty && successes.isNotEmpty) {
        // Semua sukses → mark as submitted
        totalSuccess++;
        final updated = receipt.copyWith(
          isSubmitted: true,
          submittedAt: DateTime.now(),
          submissionError: null,
          fireflyTransactionIds: txIds,
          fireflyTransactionUrls: txUrls,
          fireflyTransactionId: txIds.isNotEmpty ? txIds.first : null,
          fireflyTransactionUrl: txUrls.isNotEmpty ? txUrls.first : null,
        );
        await LocalReceiptService.saveReceipt(updated);
      } else {
        // Ada yang gagal → simpan ID parsial, tetap unsubmitted
        totalFailure++;
        final errorMsg = failures
            .map((r) => r.error?.replaceFirst('Exception: ', '') ?? 'Gagal')
            .join('; ');
        final updated = receipt.copyWith(
          isSubmitted: false,
          submissionError: errorMsg,
          fireflyTransactionIds: txIds,
          fireflyTransactionUrls: txUrls,
        );
        await LocalReceiptService.saveReceipt(updated);
      }
    }

    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(
              '$totalSuccess nota berhasil, $totalFailure nota masih gagal'),
          duration: const Duration(seconds: 3),
        ),
      );
    }
  }

  Future<void> _deleteReceipt(String receiptId) async {
    try {
      await LocalReceiptService.removeReceipt(receiptId);
      await _loadReceipts();
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Nota berhasil dihapus')),
        );
      }
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal menghapus nota: $e')),
        );
      }
    }
  }

  String _formatCurrency(double amount) {
    final formatter = NumberFormat.currency(
      locale: 'id_ID',
      symbol: 'Rp ',
      decimalDigits: 0,
    );
    // Jangan hapus .00 karena ini penting untuk format rupiah
    String formatted = formatter.format(amount);
    // Hapus .00 hanya jika muncul di akhir
    if (formatted.endsWith('.00')) {
      formatted = formatted.substring(0, formatted.length - 3);
    }
    return formatted;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Nota Tersimpan'),
        actions: [
          // Tombol Kirim Semua Nota (batch send)
          IconButton(
            icon: const Icon(Icons.cloud_upload),
            tooltip: 'Kirim Semua Nota',
            onPressed: isLoading ? null : _submitAllReceipts,
          ),
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: isLoading ? null : _loadReceipts,
          ),
        ],
      ),
      body: Column(
        children: [
          // Receipts list
          Expanded(
            child: isLoading
                ? const Center(child: CircularProgressIndicator())
                : receipts.isEmpty
                    ? const Center(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Icon(
                              Icons.receipt_outlined,
                              size: 64,
                              color: Colors.grey,
                            ),
                            SizedBox(height: 16),
                            Text(
                              'Belum ada nota tersimpan',
                              style: TextStyle(
                                fontSize: 16,
                                color: Colors.grey,
                              ),
                            ),
                          ],
                        ),
                      )
                    : RefreshIndicator(
                        onRefresh: _loadReceipts,
                        child: ListView.builder(
                          padding: const EdgeInsets.symmetric(horizontal: 16),
                          itemCount: receipts.length,
                          itemBuilder: (context, index) {
                            final receipt = receipts[index];
                            return Dismissible(
                              key: Key(receipt.id),
                              direction: DismissDirection.endToStart,
                              onDismissed: (direction) {
                                _deleteReceipt(receipt.id);
                              },
                              background: Container(
                                color: Colors.red,
                                alignment: Alignment.centerRight,
                                padding: const EdgeInsets.only(right: 16),
                                child: const Icon(
                                  Icons.delete,
                                  color: Colors.white,
                                  size: 24,
                                ),
                              ),
                              child: Card(
                                margin: const EdgeInsets.only(bottom: 8),
                                child: ListTile(
                                  contentPadding: const EdgeInsets.all(16),
                                  leading: Container(
                                    width: 40,
                                    height: 40,
                                    decoration: BoxDecoration(
                                      color: receipt.isSubmitted
                                          ? Colors.green.shade100
                                          : Colors.orange.shade100,
                                      borderRadius: BorderRadius.circular(20),
                                    ),
                                    child: Icon(
                                      receipt.isSubmitted
                                          ? Icons.check_circle
                                          : Icons.access_time,
                                      color: receipt.isSubmitted
                                          ? Colors.green
                                          : Colors.orange,
                                      size: 20,
                                    ),
                                  ),
                                  title: Row(
                                    mainAxisAlignment:
                                        MainAxisAlignment.spaceBetween,
                                    children: [
                                      // Transaction description di kiri
                                      Expanded(
                                        flex: 2,
                                        child: Text(
                                          receipt.transactionDescription ??
                                              'Transaksi Struk Belanja',
                                          style: const TextStyle(
                                            fontWeight: FontWeight.bold,
                                            fontSize: 14,
                                          ),
                                          maxLines: 2,
                                          overflow: TextOverflow.ellipsis,
                                        ),
                                      ),
                                      const SizedBox(width: 8),
                                      // Total di kanan
                                      Expanded(
                                        child: Text(
                                          _formatCurrency(receipt.total),
                                          style: const TextStyle(
                                            fontWeight: FontWeight.bold,
                                            fontSize: 14,
                                            color: Colors.blue,
                                          ),
                                          textAlign: TextAlign.right,
                                        ),
                                      ),
                                    ],
                                  ),
                                  subtitle: Column(
                                    crossAxisAlignment:
                                        CrossAxisAlignment.start,
                                    children: [
                                      const SizedBox(height: 4),
                                      Text(
                                        'Dibuat: ${DateFormat('dd/MM/yyyy HH:mm').format(receipt.createdAt)}',
                                        style: const TextStyle(fontSize: 12),
                                      ),
                                      if (receipt.isSubmitted)
                                        Text(
                                          'Dikirim: ${DateFormat('dd/MM/yyyy HH:mm').format(receipt.submittedAt ?? receipt.createdAt)}',
                                          style: const TextStyle(
                                            fontSize: 12,
                                            color: Colors.green,
                                          ),
                                        ),
                                      if (receipt.submissionError != null)
                                        Text(
                                          'Error: ${receipt.submissionError}',
                                          style: const TextStyle(
                                            fontSize: 12,
                                            color: Colors.red,
                                          ),
                                        ),
                                    ],
                                  ),
                                  onTap: () {
                                    if (receipt.isSubmitted &&
                                        receipt.allFireflyUrls.isNotEmpty) {
                                      // Tampilkan dialog daftar link
                                      showDialog(
                                        context: context,
                                        builder: (context) =>
                                            TransactionLinksDialog(
                                          urls: receipt.allFireflyUrls,
                                          title: 'Detail Transaksi',
                                        ),
                                      );
                                    } else {
                                      // Jika belum dikirim, edit nota
                                      _editReceipt(receipt);
                                    }
                                  },
                                  tileColor: receipt.isSubmitted &&
                                          receipt.allFireflyUrls.isNotEmpty
                                      ? Colors.blue.shade50
                                      : null,
                                ),
                              ),
                            );
                          },
                        ),
                      ),
          ),
        ],
      ),
    );
  }

  // Fungsi _showDeleteConfirmation dihapus karena sudah menggunakan swipe gesture

  Future<void> _editReceipt(LocalReceipt receipt) async {
    // Navigate ke receipt screen dan muat data receipt
    final receiptProvider = context.read<ReceiptProvider>();
    receiptProvider.loadReceiptForEdit(receipt);

    // Hapus receipt dari daftar sebelum navigasi
    await LocalReceiptService.removeReceipt(receipt.id);

    // Navigasi ke receipt screen
    await Navigator.pushNamed(context, '/receipt');

    // Refresh daftar setelah kembali dari edit
    await _loadReceipts();
  }
}