/**
 * Integration Test: Sponsor Billing Use Case Orchestration
 * 
 * Tests the orchestration logic of sponsor billing-related Use Cases:
 * - GetBillingStatisticsUseCase: Retrieves billing statistics
 * - GetPaymentMethodsUseCase: Retrieves payment methods
 * - SetDefaultPaymentMethodUseCase: Sets default payment method
 * - GetInvoicesUseCase: Retrieves invoices
 * - DownloadInvoiceUseCase: Downloads invoice
 * - Validates that Use Cases correctly interact with their Ports (Repositories, Event Publishers)
 * - Uses In-Memory adapters for fast, deterministic testing
 * 
 * Focus: Business logic orchestration, NOT UI rendering
 */

import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
import { InMemorySponsorRepository } from '../../../adapters/sponsors/persistence/inmemory/InMemorySponsorRepository';
import { InMemoryBillingRepository } from '../../../adapters/billing/persistence/inmemory/InMemoryBillingRepository';
import { InMemoryEventPublisher } from '../../../adapters/events/InMemoryEventPublisher';
import { GetBillingStatisticsUseCase } from '../../../core/sponsors/use-cases/GetBillingStatisticsUseCase';
import { GetPaymentMethodsUseCase } from '../../../core/sponsors/use-cases/GetPaymentMethodsUseCase';
import { SetDefaultPaymentMethodUseCase } from '../../../core/sponsors/use-cases/SetDefaultPaymentMethodUseCase';
import { GetInvoicesUseCase } from '../../../core/sponsors/use-cases/GetInvoicesUseCase';
import { DownloadInvoiceUseCase } from '../../../core/sponsors/use-cases/DownloadInvoiceUseCase';
import { GetBillingStatisticsQuery } from '../../../core/sponsors/ports/GetBillingStatisticsQuery';
import { GetPaymentMethodsQuery } from '../../../core/sponsors/ports/GetPaymentMethodsQuery';
import { SetDefaultPaymentMethodCommand } from '../../../core/sponsors/ports/SetDefaultPaymentMethodCommand';
import { GetInvoicesQuery } from '../../../core/sponsors/ports/GetInvoicesQuery';
import { DownloadInvoiceCommand } from '../../../core/sponsors/ports/DownloadInvoiceCommand';

describe('Sponsor Billing Use Case Orchestration', () => {
  let sponsorRepository: InMemorySponsorRepository;
  let billingRepository: InMemoryBillingRepository;
  let eventPublisher: InMemoryEventPublisher;
  let getBillingStatisticsUseCase: GetBillingStatisticsUseCase;
  let getPaymentMethodsUseCase: GetPaymentMethodsUseCase;
  let setDefaultPaymentMethodUseCase: SetDefaultPaymentMethodUseCase;
  let getInvoicesUseCase: GetInvoicesUseCase;
  let downloadInvoiceUseCase: DownloadInvoiceUseCase;

  beforeAll(() => {
    // TODO: Initialize In-Memory repositories and event publisher
    // sponsorRepository = new InMemorySponsorRepository();
    // billingRepository = new InMemoryBillingRepository();
    // eventPublisher = new InMemoryEventPublisher();
    // getBillingStatisticsUseCase = new GetBillingStatisticsUseCase({
    //   sponsorRepository,
    //   billingRepository,
    //   eventPublisher,
    // });
    // getPaymentMethodsUseCase = new GetPaymentMethodsUseCase({
    //   sponsorRepository,
    //   billingRepository,
    //   eventPublisher,
    // });
    // setDefaultPaymentMethodUseCase = new SetDefaultPaymentMethodUseCase({
    //   sponsorRepository,
    //   billingRepository,
    //   eventPublisher,
    // });
    // getInvoicesUseCase = new GetInvoicesUseCase({
    //   sponsorRepository,
    //   billingRepository,
    //   eventPublisher,
    // });
    // downloadInvoiceUseCase = new DownloadInvoiceUseCase({
    //   sponsorRepository,
    //   billingRepository,
    //   eventPublisher,
    // });
  });

  beforeEach(() => {
    // TODO: Clear all In-Memory repositories before each test
    // sponsorRepository.clear();
    // billingRepository.clear();
    // eventPublisher.clear();
  });

  describe('GetBillingStatisticsUseCase - Success Path', () => {
    it('should retrieve billing statistics for a sponsor', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with billing data
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has total spent: $5000
      // And: The sponsor has pending payments: $1000
      // And: The sponsor has next payment date: "2024-02-01"
      // And: The sponsor has monthly average spend: $1250
      // When: GetBillingStatisticsUseCase.execute() is called with sponsor ID
      // Then: The result should show total spent: $5000
      // And: The result should show pending payments: $1000
      // And: The result should show next payment date: "2024-02-01"
      // And: The result should show monthly average spend: $1250
      // And: EventPublisher should emit BillingStatisticsAccessedEvent
    });

    it('should retrieve statistics with zero values', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with no billing data
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has no billing history
      // When: GetBillingStatisticsUseCase.execute() is called with sponsor ID
      // Then: The result should show total spent: $0
      // And: The result should show pending payments: $0
      // And: The result should show next payment date: null
      // And: The result should show monthly average spend: $0
      // And: EventPublisher should emit BillingStatisticsAccessedEvent
    });
  });

  describe('GetBillingStatisticsUseCase - Error Handling', () => {
    it('should throw error when sponsor does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent sponsor
      // Given: No sponsor exists with the given ID
      // When: GetBillingStatisticsUseCase.execute() is called with non-existent sponsor ID
      // Then: Should throw SponsorNotFoundError
      // And: EventPublisher should NOT emit any events
    });

    it('should throw error when sponsor ID is invalid', async () => {
      // TODO: Implement test
      // Scenario: Invalid sponsor ID
      // Given: An invalid sponsor ID (e.g., empty string, null, undefined)
      // When: GetBillingStatisticsUseCase.execute() is called with invalid sponsor ID
      // Then: Should throw ValidationError
      // And: EventPublisher should NOT emit any events
    });
  });

  describe('GetPaymentMethodsUseCase - Success Path', () => {
    it('should retrieve payment methods for a sponsor', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with multiple payment methods
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 3 payment methods (1 default, 2 non-default)
      // When: GetPaymentMethodsUseCase.execute() is called with sponsor ID
      // Then: The result should contain all 3 payment methods
      // And: Each payment method should display its details
      // And: The default payment method should be marked
      // And: EventPublisher should emit PaymentMethodsAccessedEvent
    });

    it('should retrieve payment methods with minimal data', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with single payment method
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 1 payment method (default)
      // When: GetPaymentMethodsUseCase.execute() is called with sponsor ID
      // Then: The result should contain the single payment method
      // And: EventPublisher should emit PaymentMethodsAccessedEvent
    });

    it('should retrieve payment methods with empty result', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with no payment methods
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has no payment methods
      // When: GetPaymentMethodsUseCase.execute() is called with sponsor ID
      // Then: The result should be empty
      // And: EventPublisher should emit PaymentMethodsAccessedEvent
    });
  });

  describe('GetPaymentMethodsUseCase - Error Handling', () => {
    it('should throw error when sponsor does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent sponsor
      // Given: No sponsor exists with the given ID
      // When: GetPaymentMethodsUseCase.execute() is called with non-existent sponsor ID
      // Then: Should throw SponsorNotFoundError
      // And: EventPublisher should NOT emit any events
    });
  });

  describe('SetDefaultPaymentMethodUseCase - Success Path', () => {
    it('should set default payment method for a sponsor', async () => {
      // TODO: Implement test
      // Scenario: Set default payment method
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 3 payment methods (1 default, 2 non-default)
      // When: SetDefaultPaymentMethodUseCase.execute() is called with payment method ID
      // Then: The payment method should become default
      // And: The previous default should no longer be default
      // And: EventPublisher should emit PaymentMethodUpdatedEvent
    });

    it('should set default payment method when no default exists', async () => {
      // TODO: Implement test
      // Scenario: Set default when none exists
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 2 payment methods (no default)
      // When: SetDefaultPaymentMethodUseCase.execute() is called with payment method ID
      // Then: The payment method should become default
      // And: EventPublisher should emit PaymentMethodUpdatedEvent
    });
  });

  describe('SetDefaultPaymentMethodUseCase - Error Handling', () => {
    it('should throw error when sponsor does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent sponsor
      // Given: No sponsor exists with the given ID
      // When: SetDefaultPaymentMethodUseCase.execute() is called with non-existent sponsor ID
      // Then: Should throw SponsorNotFoundError
      // And: EventPublisher should NOT emit any events
    });

    it('should throw error when payment method does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent payment method
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 2 payment methods
      // When: SetDefaultPaymentMethodUseCase.execute() is called with non-existent payment method ID
      // Then: Should throw PaymentMethodNotFoundError
      // And: EventPublisher should NOT emit any events
    });

    it('should throw error when payment method does not belong to sponsor', async () => {
      // TODO: Implement test
      // Scenario: Payment method belongs to different sponsor
      // Given: Sponsor A exists with ID "sponsor-123"
      // And: Sponsor B exists with ID "sponsor-456"
      // And: Sponsor B has a payment method with ID "pm-789"
      // When: SetDefaultPaymentMethodUseCase.execute() is called with sponsor ID "sponsor-123" and payment method ID "pm-789"
      // Then: Should throw PaymentMethodNotFoundError
      // And: EventPublisher should NOT emit any events
    });
  });

  describe('GetInvoicesUseCase - Success Path', () => {
    it('should retrieve invoices for a sponsor', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with multiple invoices
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 5 invoices (2 pending, 2 paid, 1 overdue)
      // When: GetInvoicesUseCase.execute() is called with sponsor ID
      // Then: The result should contain all 5 invoices
      // And: Each invoice should display its details
      // And: EventPublisher should emit InvoicesAccessedEvent
    });

    it('should retrieve invoices with minimal data', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with single invoice
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 1 invoice
      // When: GetInvoicesUseCase.execute() is called with sponsor ID
      // Then: The result should contain the single invoice
      // And: EventPublisher should emit InvoicesAccessedEvent
    });

    it('should retrieve invoices with empty result', async () => {
      // TODO: Implement test
      // Scenario: Sponsor with no invoices
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has no invoices
      // When: GetInvoicesUseCase.execute() is called with sponsor ID
      // Then: The result should be empty
      // And: EventPublisher should emit InvoicesAccessedEvent
    });
  });

  describe('GetInvoicesUseCase - Error Handling', () => {
    it('should throw error when sponsor does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent sponsor
      // Given: No sponsor exists with the given ID
      // When: GetInvoicesUseCase.execute() is called with non-existent sponsor ID
      // Then: Should throw SponsorNotFoundError
      // And: EventPublisher should NOT emit any events
    });
  });

  describe('DownloadInvoiceUseCase - Success Path', () => {
    it('should download invoice for a sponsor', async () => {
      // TODO: Implement test
      // Scenario: Download invoice
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has an invoice with ID "inv-456"
      // When: DownloadInvoiceUseCase.execute() is called with invoice ID
      // Then: The invoice should be downloaded
      // And: The invoice should be in PDF format
      // And: EventPublisher should emit InvoiceDownloadedEvent
    });

    it('should download invoice with correct content', async () => {
      // TODO: Implement test
      // Scenario: Download invoice with correct content
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has an invoice with ID "inv-456"
      // When: DownloadInvoiceUseCase.execute() is called with invoice ID
      // Then: The downloaded invoice should contain correct invoice number
      // And: The downloaded invoice should contain correct date
      // And: The downloaded invoice should contain correct amount
      // And: EventPublisher should emit InvoiceDownloadedEvent
    });
  });

  describe('DownloadInvoiceUseCase - Error Handling', () => {
    it('should throw error when invoice does not exist', async () => {
      // TODO: Implement test
      // Scenario: Non-existent invoice
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has no invoice with ID "inv-999"
      // When: DownloadInvoiceUseCase.execute() is called with non-existent invoice ID
      // Then: Should throw InvoiceNotFoundError
      // And: EventPublisher should NOT emit any events
    });

    it('should throw error when invoice does not belong to sponsor', async () => {
      // TODO: Implement test
      // Scenario: Invoice belongs to different sponsor
      // Given: Sponsor A exists with ID "sponsor-123"
      // And: Sponsor B exists with ID "sponsor-456"
      // And: Sponsor B has an invoice with ID "inv-789"
      // When: DownloadInvoiceUseCase.execute() is called with invoice ID "inv-789"
      // Then: Should throw InvoiceNotFoundError
      // And: EventPublisher should NOT emit any events
    });
  });

  describe('Billing Data Orchestration', () => {
    it('should correctly aggregate billing statistics', async () => {
      // TODO: Implement test
      // Scenario: Billing statistics aggregation
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 3 invoices with amounts: $1000, $2000, $3000
      // And: The sponsor has 1 pending invoice with amount: $500
      // When: GetBillingStatisticsUseCase.execute() is called
      // Then: Total spent should be $6000
      // And: Pending payments should be $500
      // And: EventPublisher should emit BillingStatisticsAccessedEvent
    });

    it('should correctly set default payment method', async () => {
      // TODO: Implement test
      // Scenario: Set default payment method
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has 3 payment methods
      // When: SetDefaultPaymentMethodUseCase.execute() is called
      // Then: Only one payment method should be default
      // And: The default payment method should be marked correctly
      // And: EventPublisher should emit PaymentMethodUpdatedEvent
    });

    it('should correctly retrieve invoices with status', async () => {
      // TODO: Implement test
      // Scenario: Invoice status retrieval
      // Given: A sponsor exists with ID "sponsor-123"
      // And: The sponsor has invoices with different statuses
      // When: GetInvoicesUseCase.execute() is called
      // Then: Each invoice should have correct status
      // And: Pending invoices should be highlighted
      // And: Overdue invoices should show warning
      // And: EventPublisher should emit InvoicesAccessedEvent
    });
  });
});