/**
 * Contract test for ICredentialManager interface
 *
 * This test verifies that any implementation of ICredentialManager
 * adheres to the contract defined in the specifications.
 *
 * Tests MUST FAIL initially until implementation is provided.
 */

import { describe, test, expect, beforeEach, afterEach } from '@jest/globals';

// Import types from implemented credential manager
import {
  ICredentialManager,
  Account,
  LoadResult,
  SignResult,
  Platform
} from '@/types/credential';

describe('ICredentialManager Contract Tests', () => {
  let credentialManager: ICredentialManager;

  beforeEach(async () => {
    // Import the implemented CredentialManager
    const { CredentialManager } = await import('@/core/credential-manager/CredentialManager');
    credentialManager = new CredentialManager();
  });

  afterEach(() => {
    if (credentialManager && typeof credentialManager.stopWatching === 'function') {
      credentialManager.stopWatching();
    }
  });

  describe('Configuration Loading', () => {
    test('should load configuration file successfully', async () => {
      // Arrange
      const testConfigPath = '/tmp/test-credential-config.json';

      // Act & Assert
      const result: LoadResult = await credentialManager.loadConfig(testConfigPath);

      expect(result).toBeDefined();
      expect(typeof result.success).toBe('boolean');
      expect(Array.isArray(result.accounts)).toBe(true);
      expect(typeof result.loadTime).toBe('number');

      // Performance requirement: load time < 100ms
      expect(result.loadTime).toBeLessThan(100);
    });

    test('should handle missing configuration file gracefully', async () => {
      // Arrange
      const nonExistentPath = '/tmp/nonexistent-config.json';

      // Act & Assert
      const result: LoadResult = await credentialManager.loadConfig(nonExistentPath);

      expect(result.success).toBe(false);
      expect(result.errors).toBeDefined();
      expect(result.errors!.length).toBeGreaterThan(0);
    });

    test('should handle malformed configuration file', async () => {
      // This test will validate error handling for invalid JSON/YAML
      const malformedConfigPath = '/tmp/malformed-config.json';

      const result: LoadResult = await credentialManager.loadConfig(malformedConfigPath);

      expect(result.success).toBe(false);
      expect(result.errors).toBeDefined();
    });
  });

  describe('Configuration Watching', () => {
    test('should start watching configuration file changes', () => {
      // Arrange
      const testConfigPath = '/tmp/test-credential-config.json';
      const mockCallback = jest.fn();

      // Act & Assert - should not throw
      expect(() => {
        credentialManager.watchConfig(testConfigPath, mockCallback);
      }).not.toThrow();
    });

    test('should stop watching configuration file changes', () => {
      // Act & Assert - should not throw
      expect(() => {
        credentialManager.stopWatching();
      }).not.toThrow();
    });

    test('should call callback when configuration changes', async () => {
      // This is a complex integration test that would require file system mocking
      // For now, we just verify the interface exists
      const mockCallback = jest.fn();
      credentialManager.watchConfig('/tmp/test.json', mockCallback);

      // Interface contract verification
      expect(typeof credentialManager.watchConfig).toBe('function');
      expect(typeof credentialManager.stopWatching).toBe('function');
    });
  });

  describe('Account Management', () => {
    test('should retrieve account by ID', () => {
      // Arrange
      const testAccountId = 'test-account-001';

      // Act
      const account: Account | null = credentialManager.getAccount(testAccountId);

      // Assert - can be null if account doesn't exist
      if (account) {
        expect(account.id).toBe(testAccountId);
        expect(Object.values(Platform)).toContain(account.platform);
        expect(account.credentials).toBeDefined();
      } else {
        expect(account).toBeNull();
      }
    });

    test('should list all accounts', () => {
      // Act
      const accounts: Account[] = credentialManager.listAccounts();

      // Assert
      expect(Array.isArray(accounts)).toBe(true);

      // Each account should have required properties
      accounts.forEach(account => {
        expect(typeof account.id).toBe('string');
        expect(Object.values(Platform)).toContain(account.platform);
        expect(account.credentials).toBeDefined();
        expect(account.credentials.type).toBeDefined();
      });
    });

    test('should return empty array when no accounts loaded', () => {
      // For a fresh credential manager instance
      const accounts: Account[] = credentialManager.listAccounts();

      expect(Array.isArray(accounts)).toBe(true);
      // Could be empty initially, which is valid
    });
  });

  describe('Signing Operations', () => {
    test('should sign message successfully', async () => {
      // Arrange
      const testAccountId = 'test-pacifica-account';
      const testMessage = new Uint8Array([1, 2, 3, 4, 5]);

      // Act
      const result: SignResult = await credentialManager.sign(testAccountId, testMessage);

      // Assert
      expect(result).toBeDefined();
      expect(typeof result.success).toBe('boolean');
      expect(typeof result.algorithm).toBe('string');
      expect(result.timestamp).toBeInstanceOf(Date);

      if (result.success) {
        expect(typeof result.signature).toBe('string');
        expect(result.signature!.length).toBeGreaterThan(0);
      } else {
        expect(typeof result.error).toBe('string');
      }
    });

    test('should verify signature successfully', async () => {
      // Arrange
      const testAccountId = 'test-pacifica-account';
      const testMessage = new Uint8Array([1, 2, 3, 4, 5]);
      const testSignature = 'mock-signature';

      // Act
      const isValid: boolean = await credentialManager.verify(testAccountId, testMessage, testSignature);

      // Assert
      expect(typeof isValid).toBe('boolean');
    });

    test('should handle signing with non-existent account', async () => {
      // Arrange
      const nonExistentAccountId = 'non-existent-account';
      const testMessage = new Uint8Array([1, 2, 3, 4, 5]);

      // Act
      const result: SignResult = await credentialManager.sign(nonExistentAccountId, testMessage);

      // Assert
      expect(result.success).toBe(false);
      expect(typeof result.error).toBe('string');
    });

    test('should meet performance requirements for signing', async () => {
      // Performance requirement: signing < 50ms
      const testAccountId = 'test-account';
      const testMessage = new Uint8Array([1, 2, 3, 4, 5]);

      const startTime = Date.now();
      await credentialManager.sign(testAccountId, testMessage);
      const duration = Date.now() - startTime;

      // Performance contract: < 50ms
      expect(duration).toBeLessThan(50);
    });
  });

  describe('Error Handling', () => {
    test('should handle invalid account ID gracefully', () => {
      // Test various invalid inputs
      expect(credentialManager.getAccount('')).toBeNull();
      expect(credentialManager.getAccount('   ')).toBeNull();
    });

    test('should handle invalid file paths in loadConfig', async () => {
      const invalidPaths = ['', '   ', null as any, undefined as any];

      for (const invalidPath of invalidPaths) {
        const result = await credentialManager.loadConfig(invalidPath);
        expect(result.success).toBe(false);
      }
    });
  });
});