CoffeeAtHome/lib/examples/csv_crud_example.dart

// Example: How to use CRUD operations with CSV data

import '../services/csv_data_service.dart';
import '../models/bean.dart';
import '../models/machine.dart';

class CsvCrudExample {
  final CsvDataService _csvService = CsvDataService();

  // Example 1: Add a custom bean to the catalog
  Future<void> addCustomBean() async {
    final customBean = Bean(
      id: 'custom_bean_1',
      name: 'My Special Blend',
      origin: 'Custom',
      farm: 'Home Roastery',
      producer: 'Me',
      varietal: 'Mixed',
      altitude: 1200,
      processingMethod: 'Washed',
      harvestSeason: '2025',
      flavorNotes: [TastingNotes.chocolate, TastingNotes.nutty],
      acidity: Acidity.medium,
      body: Body.medium,
      sweetness: 7,
      roastLevel: RoastLevel.medium,
      cupScore: 88.0,
      price: 25.0,
      availability: Availability.available,
      certifications: ['Custom Roasted'],
      roaster: 'Home Roaster',
      roastDate: DateTime.now(),
      bestByDate: DateTime.now().add(Duration(days: 30)),
      brewingMethods: ['Espresso', 'Pour Over'],
      isOwned: false,
      quantity: 0.0,
      notes: 'My own custom blend',
    );

    await _csvService.saveBean(customBean);
    print('Custom bean added to catalog!');
  }

  // Example 2: List all beans (CSV + custom)
  Future<void> listAllBeans() async {
    final allBeans = await _csvService.getBeans();
    
    print('Total beans in catalog: ${allBeans.length}');
    
    // Separate CSV and custom beans
    final csvBeans = await _csvService.getCsvBeans();
    final customBeans = _csvService.getCustomBeans();
    
    print('CSV beans: ${csvBeans.length}');
    print('Custom beans: ${customBeans.length}');
    
    // List custom beans
    for (final bean in customBeans) {
      print('Custom: ${bean.name} - ${bean.roaster}');
    }
  }

  // Example 3: Try to delete a CSV bean (will fail)
  Future<void> tryDeleteCsvBean() async {
    try {
      await _csvService.deleteBean('bean_1'); // Assuming this is a CSV bean
    } catch (e) {
      print('Expected error: $e');
    }
  }

  // Example 4: Delete a custom bean (will succeed)
  Future<void> deleteCustomBean() async {
    try {
      await _csvService.deleteBean('custom_bean_1');
      print('Custom bean deleted successfully!');
    } catch (e) {
      print('Error deleting custom bean: $e');
    }
  }

  // Example 5: Check if item is from CSV or custom
  Future<void> checkItemSource() async {
    final allBeans = await _csvService.getBeans();
    
    for (final bean in allBeans.take(5)) {
      final isFromCsv = _csvService.isCsvBean(bean.id);
      print('${bean.name}: ${isFromCsv ? "CSV" : "Custom"}');
    }
  }

  // Example 6: Add custom machine
  Future<void> addCustomMachine() async {
    final customMachine = Machine(
      id: 'custom_machine_1',
      manufacturer: 'Custom',
      model: 'DIY Espresso Machine',
      year: 2025,
      type: MachineType.espresso,
      steamWand: true,
      details: 'Built from scratch with love',
      isOwned: false,
      rating: 5.0,
      popularity: 1,
      portafilters: [
        Portafilter(
          id: 'custom_pf_1',
          size: '58mm',
          material: 'Stainless Steel',
        )
      ],
      specifications: {
        'Boiler': 'Single',
        'Pressure': '9 bar',
        'Water Tank': '2L',
      },
    );

    await _csvService.saveMachine(customMachine);
    print('Custom machine added to catalog!');
  }

  // Example 7: Update existing custom item
  Future<void> updateCustomBean() async {
    final customBeans = _csvService.getCustomBeans();
    if (customBeans.isNotEmpty) {
      final existingBean = customBeans.first;
      final beanToUpdate = Bean(
        id: existingBean.id,
        name: existingBean.name,
        origin: existingBean.origin,
        farm: existingBean.farm,
        producer: existingBean.producer,
        varietal: existingBean.varietal,
        altitude: existingBean.altitude,
        processingMethod: existingBean.processingMethod,
        harvestSeason: existingBean.harvestSeason,
        flavorNotes: existingBean.flavorNotes,
        acidity: existingBean.acidity,
        body: existingBean.body,
        sweetness: existingBean.sweetness,
        roastLevel: existingBean.roastLevel,
        cupScore: existingBean.cupScore,
        price: 30.0, // Update price
        availability: existingBean.availability,
        certifications: existingBean.certifications,
        roaster: existingBean.roaster,
        roastDate: existingBean.roastDate,
        bestByDate: existingBean.bestByDate,
        brewingMethods: existingBean.brewingMethods,
        isOwned: existingBean.isOwned,
        quantity: existingBean.quantity,
        notes: 'Updated notes: Even better now!', // Update notes
      );
      
      await _csvService.saveBean(beanToUpdate);
      print('Custom bean updated!');
    }
  }
}

// Usage example
void main() async {
  final example = CsvCrudExample();
  
  // Add custom items
  await example.addCustomBean();
  await example.addCustomMachine();
  
  // List and check items
  await example.listAllBeans();
  await example.checkItemSource();
  
  // Try operations
  await example.tryDeleteCsvBean(); // Will fail
  await example.updateCustomBean(); // Will succeed
  await example.deleteCustomBean(); // Will succeed
}