// lib/services/saved_report_service.dart

import 'dart:convert';
import 'dart:io';
import 'package:path_provider/path_provider.dart';
import 'package:cashumit/models/saved_report.dart';

class SavedReportService {
  static const String _folderName = 'saved_reports';

  /// Mendapatkan direktori penyimpanan berkas draft laporan
  static Future<Directory> _getReportsDirectory() async {
    final appDir = await getApplicationDocumentsDirectory();
    final reportsDir = Directory('${appDir.path}/$_folderName');
    if (!await reportsDir.exists()) {
      await reportsDir.create(recursive: true);
    }
    return reportsDir;
  }

  /// Menyimpan atau memperbarui draft laporan ke dalam file JSON lokal
  static Future<void> saveReport(SavedReport report) async {
    final dir = await _getReportsDirectory();
    report.updatedAt = DateTime.now();
    final file = File('${dir.path}/report_${report.id}.json');
    final jsonString = jsonEncode(report.toJson());
    await file.writeAsString(jsonString);
  }

  /// Mengambil seluruh daftar draft laporan tersimpan, diurutkan dari yang terbaru
  static Future<List<SavedReport>> getAllReports() async {
    try {
      final dir = await _getReportsDirectory();
      final entities = await dir.list().toList();
      final List<SavedReport> reports = [];

      for (final entity in entities) {
        if (entity is File && entity.path.endsWith('.json')) {
          try {
            final content = await entity.readAsString();
            final Map<String, dynamic> jsonMap = jsonDecode(content);
            reports.add(SavedReport.fromJson(jsonMap));
          } catch (e) {
            // Lewati berkas rusak
          }
        }
      }

      // Urutkan dari yang paling baru diupdate
      reports.sort((a, b) => b.updatedAt.compareTo(a.updatedAt));
      return reports;
    } catch (e) {
      return [];
    }
  }

  /// Mengambil satu draft laporan berdasarkan ID
  static Future<SavedReport?> getReport(String id) async {
    try {
      final dir = await _getReportsDirectory();
      final file = File('${dir.path}/report_$id.json');
      if (await file.exists()) {
        final content = await file.readAsString();
        final Map<String, dynamic> jsonMap = jsonDecode(content);
        return SavedReport.fromJson(jsonMap);
      }
      return null;
    } catch (e) {
      return null;
    }
  }

  /// Menghapus draft laporan berdasarkan ID
  static Future<bool> deleteReport(String id) async {
    try {
      final dir = await _getReportsDirectory();
      final file = File('${dir.path}/report_$id.json');
      if (await file.exists()) {
        await file.delete();
        return true;
      }
      return false;
    } catch (e) {
      return false;
    }
  }
}