// lib/screens/transaction_screen.dart

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../models/firefly_account.dart';
import '../services/firefly_api_service.dart';
import '../services/account_mirror_service.dart';
import '../services/account_cache_service.dart';

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

  @override
  State<TransactionScreen> createState() => _TransactionScreenState();
}

class _TransactionScreenState extends State<TransactionScreen> {
  List<FireflyAccount> _revenueAccounts = [];
  List<FireflyAccount> _assetAccounts = [];
  FireflyAccount? _selectedSourceAccount;
  FireflyAccount? _selectedDestinationAccount;

  bool _isLoading = false;
  String _message = '';

  String? _fireflyUrl;
  String? _accessToken;

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

  /// Memuat kredensial dari shared preferences dan kemudian memuat akun.
  Future<void> _loadCredentialsAndAccounts() async {
    final prefs = await SharedPreferences.getInstance();
    final url = prefs.getString('firefly_url');
    final token = prefs.getString('firefly_token');

    if (url == null || token == null || url.isEmpty || token.isEmpty) {
      setState(() {
        _message =
            'Kredensial Firefly III belum dikonfigurasi. Silakan atur di menu konfigurasi.';
      });
      return;
    }

    setState(() {
      _fireflyUrl = url;
      _accessToken = token;
    });

    // Jika kredensial ada, lanjutkan untuk memuat akun dengan fallback mekanisme
    _loadAccountsWithFallback();
  }

  /// Memuat daftar akun sumber (revenue) dan tujuan (asset) dari API dengan fallback.
  Future<void> _loadAccountsWithFallback() async {
    if (_fireflyUrl == null || _accessToken == null) {
      return;
    }

    setState(() {
      _isLoading = true;
      _message = 'Memuat daftar akun...';
    });

    try {
      // Mengambil akun revenue dengan fallback
      final revenueAccounts = await FireflyApiService.fetchAccounts(
        baseUrl: _fireflyUrl!,
        accessToken: _accessToken!,
        type: 'revenue',
      );

      // Simpan ke cache
      await AccountCacheService.updateAccountsFromServer(
          revenueAccounts.map((account) => account.toJson()).toList());

      // Mengambil akun asset dengan fallback
      final assetAccounts = await FireflyApiService.fetchAccounts(
        baseUrl: _fireflyUrl!,
        accessToken: _accessToken!,
        type: 'asset',
      );

      // Simpan ke cache
      await AccountCacheService.updateAccountsFromServer(
          assetAccounts.map((account) => account.toJson()).toList());

      setState(() {
        _revenueAccounts = revenueAccounts;
        _assetAccounts = assetAccounts;

        // Tidak lagi menggunakan default account mapping

        _message = 'Daftar akun berhasil dimuat.';
      });
    } catch (error) {
      // Jika gagal dari server, coba load dari cache
      try {
        final cachedRevenueAccounts =
            await AccountCacheService.getLastKnownGoodAccounts().then(
                (cached) => cached
                    .where((json) =>
                        (json['attributes'] as Map)['type'] == 'revenue')
                    .map((json) => FireflyAccount.fromJson(json))
                    .toList());

        final cachedAssetAccounts = await AccountCacheService
                .getLastKnownGoodAccounts()
            .then((cached) => cached
                .where((json) => (json['attributes'] as Map)['type'] == 'asset')
                .map((json) => FireflyAccount.fromJson(json))
                .toList());

        setState(() {
          _revenueAccounts = cachedRevenueAccounts;
          _assetAccounts = cachedAssetAccounts;

          // Coba set default account jika tersedia
          _setDefaultAccounts();

          _message = 'Akun dimuat dari cache offline.';
        });
      } catch (cacheError) {
        setState(() {
          _message =
              'Gagal memuat akun: $error, dan cache juga tidak tersedia: $cacheError';
        });
      }
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  /// Tidak lagi menggunakan default account mapping
  Future<void> _setDefaultAccounts() async {
    // Fitur default account mapping telah dihapus
  }

  /// Tidak lagi menyimpan default account mapping
  Future<void> _saveAccountMapping() async {
    // Fitur default account mapping telah dihapus
  }

  /// Mengirim transaksi dummy menggunakan akun yang dipilih.
  Future<void> _submitTransaction() async {
    if (_fireflyUrl == null || _accessToken == null) {
      setState(() {
        _message = 'Kredensial tidak lengkap.';
        return;
      });
    }
    if (_selectedSourceAccount == null || _selectedDestinationAccount == null) {
      setState(() {
        _message = 'Silakan pilih akun sumber dan tujuan.';
      });
      return;
    }

    setState(() {
      _isLoading = true;
      _message = 'Mengirim transaksi...';
    });

    try {
      final success = await FireflyApiService.submitDummyTransaction(
        baseUrl: _fireflyUrl!,
        accessToken: _accessToken!,
        sourceId: _selectedSourceAccount!.id,
        destinationId: _selectedDestinationAccount!.id,
        type: 'deposit', // Sesuaikan dengan logika bisnis
        description: 'Transaksi Dummy dari Aplikasi Flutter',
      );

      // Simpan mapping akun jika transaksi berhasil
      if (success != null) {
        await _saveAccountMapping();
      }

      setState(() {
        _message = success != null
            ? 'Transaksi berhasil dikirim!'
            : 'Gagal mengirim transaksi. Periksa log.';
      });
    } catch (error) {
      setState(() {
        _message = 'Terjadi kesalahan: $error';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Kirim Transaksi ke Firefly III'),
        actions: [
          IconButton(
            icon: const Icon(Icons.settings),
            onPressed: () {
              // Navigasi ke ConfigScreen
              Navigator.pushNamed(context, '/config');
            },
          ),
        ],
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            // Pesan status
            if (_message.isNotEmpty)
              Text(_message,
                  style: TextStyle(
                      color: _message.contains('berhasil')
                          ? Colors.green
                          : (_message.contains('belum') ||
                                  _message.contains('tidak'))
                              ? Colors.orange
                              : Colors.red)),
            const SizedBox(height: 10),

            if (_fireflyUrl != null && _accessToken != null) ...[
              // Dropdown untuk Akun Sumber (Revenue)
              const Text('Pilih Akun Sumber (Revenue):',
                  style: TextStyle(fontWeight: FontWeight.bold)),
              DropdownButton<FireflyAccount>(
                isExpanded: true,
                hint: const Text('Pilih akun sumber'),
                value: _selectedSourceAccount,
                items: _revenueAccounts.map((account) {
                  return DropdownMenuItem<FireflyAccount>(
                    value: account,
                    child: Text(account.name),
                  );
                }).toList(),
                onChanged: (account) {
                  setState(() {
                    _selectedSourceAccount = account;
                    // Simpan mapping ketika user memilih akun
                    if (account != null) {
                      _saveAccountMapping();
                    }
                  });
                },
              ),
              const SizedBox(height: 20),

              // Dropdown untuk Akun Tujuan (Asset)
              const Text('Pilih Akun Tujuan (Asset):',
                  style: TextStyle(fontWeight: FontWeight.bold)),
              DropdownButton<FireflyAccount>(
                isExpanded: true,
                hint: const Text('Pilih akun tujuan'),
                value: _selectedDestinationAccount,
                items: _assetAccounts.map((account) {
                  return DropdownMenuItem<FireflyAccount>(
                    value: account,
                    child: Text(account.name),
                  );
                }).toList(),
                onChanged: (account) {
                  setState(() {
                    _selectedDestinationAccount = account;
                    // Simpan mapping ketika user memilih akun
                    if (account != null) {
                      _saveAccountMapping();
                    }
                  });
                },
              ),
              const SizedBox(height: 20),

              // Tombol untuk memuat ulang akun
              ElevatedButton.icon(
                onPressed: _isLoading ? null : _loadAccountsWithFallback,
                icon: const Icon(Icons.refresh),
                label: const Text('Muat Ulang Akun'),
              ),
              const SizedBox(height: 10),

              // Tombol untuk mengirim transaksi
              ElevatedButton.icon(
                onPressed: _isLoading ? null : _submitTransaction,
                icon: const Icon(Icons.send),
                label: const Text('Kirim Transaksi Dummy'),
              ),
              const SizedBox(height: 20),
            ],

            // Status dan pesan loading
            if (_isLoading)
              const Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  CircularProgressIndicator(),
                  SizedBox(width: 10),
                  Text('Sedang diproses...'),
                ],
              ),
          ],
        ),
      ),
    );
  }
}