import { describe, it, expect, vi, beforeEach } from 'vitest';
import Fastify from 'fastify';
import { BackupService } from '../src/services/backup/backup-service.js';
import { RestoreService } from '../src/services/backup/restore-service.js';
import { encrypt, decrypt, isSensitiveKey } from '../src/services/backup/crypto.js';
import { registerBackupRoutes } from '../src/routes/backup.js';
import type { IMcpServerRepository, IMcpProfileRepository } from '../src/repositories/interfaces.js';
import type { IProjectRepository } from '../src/repositories/project.repository.js';

// Mock data
const mockServers = [
  {
    id: 's1', name: 'github', description: 'GitHub MCP', packageName: '@mcp/github',
    dockerImage: null, transport: 'STDIO' as const, repositoryUrl: null,
    envTemplate: [], version: 1, createdAt: new Date(), updatedAt: new Date(),
  },
  {
    id: 's2', name: 'slack', description: 'Slack MCP', packageName: null,
    dockerImage: 'mcp/slack:latest', transport: 'SSE' as const, repositoryUrl: null,
    envTemplate: [], version: 1, createdAt: new Date(), updatedAt: new Date(),
  },
];

const mockProfiles = [
  {
    id: 'p1', name: 'default', serverId: 's1', permissions: ['read'],
    envOverrides: { GITHUB_TOKEN: 'ghp_secret123' },
    version: 1, createdAt: new Date(), updatedAt: new Date(),
  },
];

const mockProjects = [
  {
    id: 'proj1', name: 'my-project', description: 'Test project',
    ownerId: 'user1', version: 1, createdAt: new Date(), updatedAt: new Date(),
  },
];

function mockServerRepo(): IMcpServerRepository {
  return {
    findAll: vi.fn(async () => [...mockServers]),
    findById: vi.fn(async (id: string) => mockServers.find((s) => s.id === id) ?? null),
    findByName: vi.fn(async (name: string) => mockServers.find((s) => s.name === name) ?? null),
    create: vi.fn(async (data) => ({ id: 'new-s', ...data, envTemplate: [], version: 1, createdAt: new Date(), updatedAt: new Date() } as typeof mockServers[0])),
    update: vi.fn(async (id, data) => ({ ...mockServers.find((s) => s.id === id)!, ...data })),
    delete: vi.fn(async () => {}),
  };
}

function mockProfileRepo(): IMcpProfileRepository {
  return {
    findAll: vi.fn(async () => [...mockProfiles]),
    findById: vi.fn(async (id: string) => mockProfiles.find((p) => p.id === id) ?? null),
    findByServerAndName: vi.fn(async () => null),
    create: vi.fn(async (data) => ({ id: 'new-p', ...data, version: 1, createdAt: new Date(), updatedAt: new Date() } as typeof mockProfiles[0])),
    update: vi.fn(async (id, data) => ({ ...mockProfiles.find((p) => p.id === id)!, ...data })),
    delete: vi.fn(async () => {}),
  };
}

function mockProjectRepo(): IProjectRepository {
  return {
    findAll: vi.fn(async () => [...mockProjects]),
    findById: vi.fn(async (id: string) => mockProjects.find((p) => p.id === id) ?? null),
    findByName: vi.fn(async () => null),
    create: vi.fn(async (data) => ({ id: 'new-proj', ...data, version: 1, createdAt: new Date(), updatedAt: new Date() } as typeof mockProjects[0])),
    update: vi.fn(async (id, data) => ({ ...mockProjects.find((p) => p.id === id)!, ...data })),
    delete: vi.fn(async () => {}),
    setProfiles: vi.fn(async () => {}),
    getProfileIds: vi.fn(async () => ['p1']),
  };
}

describe('Crypto', () => {
  it('encrypts and decrypts successfully', () => {
    const data = 'hello secret world';
    const password = 'my-password-123';
    const encrypted = encrypt(data, password);

    expect(encrypted.algorithm).toBe('aes-256-gcm');
    expect(encrypted.ciphertext).not.toBe(data);

    const decrypted = decrypt(encrypted, password);
    expect(decrypted).toBe(data);
  });

  it('fails with wrong password', () => {
    const encrypted = encrypt('secret', 'correct-password');
    expect(() => decrypt(encrypted, 'wrong-password')).toThrow();
  });

  it('handles large data', () => {
    const data = 'x'.repeat(10000);
    const encrypted = encrypt(data, 'pass');
    expect(decrypt(encrypted, 'pass')).toBe(data);
  });

  it('detects sensitive keys', () => {
    expect(isSensitiveKey('GITHUB_TOKEN')).toBe(true);
    expect(isSensitiveKey('API_KEY')).toBe(true);
    expect(isSensitiveKey('DATABASE_PASSWORD')).toBe(true);
    expect(isSensitiveKey('AWS_SECRET')).toBe(true);
    expect(isSensitiveKey('MY_SECRET_KEY')).toBe(true);
    expect(isSensitiveKey('CREDENTIALS')).toBe(true);
    expect(isSensitiveKey('PORT')).toBe(false);
    expect(isSensitiveKey('DATABASE_URL')).toBe(false);
    expect(isSensitiveKey('NODE_ENV')).toBe(false);
  });
});

describe('BackupService', () => {
  let backupService: BackupService;

  beforeEach(() => {
    backupService = new BackupService(mockServerRepo(), mockProfileRepo(), mockProjectRepo());
  });

  it('creates backup with all resources', async () => {
    const bundle = await backupService.createBackup();

    expect(bundle.version).toBe('1');
    expect(bundle.encrypted).toBe(false);
    expect(bundle.servers).toHaveLength(2);
    expect(bundle.profiles).toHaveLength(1);
    expect(bundle.projects).toHaveLength(1);
    expect(bundle.servers[0]!.name).toBe('github');
    expect(bundle.profiles[0]!.serverName).toBe('github');
    expect(bundle.projects[0]!.name).toBe('my-project');
  });

  it('filters resources', async () => {
    const bundle = await backupService.createBackup({ resources: ['servers'] });
    expect(bundle.servers).toHaveLength(2);
    expect(bundle.profiles).toHaveLength(0);
    expect(bundle.projects).toHaveLength(0);
  });

  it('encrypts sensitive env values when password provided', async () => {
    const bundle = await backupService.createBackup({ password: 'test-pass' });

    expect(bundle.encrypted).toBe(true);
    expect(bundle.encryptedSecrets).toBeDefined();
    // The GITHUB_TOKEN should be replaced with placeholder
    const overrides = bundle.profiles[0]!.envOverrides as Record<string, string>;
    expect(overrides['GITHUB_TOKEN']).toContain('__ENCRYPTED:');
  });

  it('handles empty repositories', async () => {
    const emptyServerRepo = mockServerRepo();
    (emptyServerRepo.findAll as ReturnType<typeof vi.fn>).mockResolvedValue([]);
    const emptyProfileRepo = mockProfileRepo();
    (emptyProfileRepo.findAll as ReturnType<typeof vi.fn>).mockResolvedValue([]);
    const emptyProjectRepo = mockProjectRepo();
    (emptyProjectRepo.findAll as ReturnType<typeof vi.fn>).mockResolvedValue([]);

    const service = new BackupService(emptyServerRepo, emptyProfileRepo, emptyProjectRepo);
    const bundle = await service.createBackup();

    expect(bundle.servers).toHaveLength(0);
    expect(bundle.profiles).toHaveLength(0);
    expect(bundle.projects).toHaveLength(0);
  });
});

describe('RestoreService', () => {
  let restoreService: RestoreService;
  let serverRepo: IMcpServerRepository;
  let profileRepo: IMcpProfileRepository;
  let projectRepo: IProjectRepository;

  beforeEach(() => {
    serverRepo = mockServerRepo();
    profileRepo = mockProfileRepo();
    projectRepo = mockProjectRepo();
    // Default: nothing exists yet
    (serverRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    (profileRepo.findByServerAndName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    (projectRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    restoreService = new RestoreService(serverRepo, profileRepo, projectRepo);
  });

  const validBundle = {
    version: '1',
    mcpctlVersion: '0.1.0',
    createdAt: new Date().toISOString(),
    encrypted: false,
    servers: [{ name: 'github', description: 'GitHub', packageName: null, dockerImage: null, transport: 'STDIO', repositoryUrl: null, envTemplate: [] }],
    profiles: [{ name: 'default', serverName: 'github', permissions: ['read'], envOverrides: {} }],
    projects: [{ name: 'test-proj', description: 'Test', profileNames: ['default'] }],
  };

  it('validates valid bundle', () => {
    expect(restoreService.validateBundle(validBundle)).toBe(true);
  });

  it('rejects invalid bundle', () => {
    expect(restoreService.validateBundle(null)).toBe(false);
    expect(restoreService.validateBundle({})).toBe(false);
    expect(restoreService.validateBundle({ version: '1' })).toBe(false);
  });

  it('restores all resources', async () => {
    const result = await restoreService.restore(validBundle);

    expect(result.serversCreated).toBe(1);
    expect(result.profilesCreated).toBe(1);
    expect(result.projectsCreated).toBe(1);
    expect(result.errors).toHaveLength(0);
    expect(serverRepo.create).toHaveBeenCalled();
    expect(profileRepo.create).toHaveBeenCalled();
    expect(projectRepo.create).toHaveBeenCalled();
  });

  it('skips existing resources with skip strategy', async () => {
    (serverRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(mockServers[0]);
    const result = await restoreService.restore(validBundle, { conflictStrategy: 'skip' });

    expect(result.serversSkipped).toBe(1);
    expect(result.serversCreated).toBe(0);
    expect(serverRepo.create).not.toHaveBeenCalled();
  });

  it('aborts on conflict with fail strategy', async () => {
    (serverRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(mockServers[0]);
    const result = await restoreService.restore(validBundle, { conflictStrategy: 'fail' });

    expect(result.errors).toContain('Server "github" already exists');
  });

  it('overwrites existing with overwrite strategy', async () => {
    (serverRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(mockServers[0]);
    const result = await restoreService.restore(validBundle, { conflictStrategy: 'overwrite' });

    expect(result.serversCreated).toBe(1);
    expect(serverRepo.update).toHaveBeenCalled();
  });

  it('fails restore with encrypted bundle and no password', async () => {
    const encBundle = { ...validBundle, encrypted: true, encryptedSecrets: encrypt('{}', 'pw') };
    const result = await restoreService.restore(encBundle);
    expect(result.errors).toContain('Backup is encrypted but no password provided');
  });

  it('restores encrypted bundle with correct password', async () => {
    const secrets = { 'profile:default:API_KEY': 'secret-val' };
    const encBundle = {
      ...validBundle,
      encrypted: true,
      encryptedSecrets: encrypt(JSON.stringify(secrets), 'test-pw'),
      profiles: [{ ...validBundle.profiles[0]!, envOverrides: { API_KEY: '__ENCRYPTED:profile:default:API_KEY__' } }],
    };

    const result = await restoreService.restore(encBundle, { password: 'test-pw' });
    expect(result.errors).toHaveLength(0);
    expect(result.profilesCreated).toBe(1);
  });

  it('fails with wrong decryption password', async () => {
    const encBundle = {
      ...validBundle,
      encrypted: true,
      encryptedSecrets: encrypt('{"key":"val"}', 'correct'),
    };
    const result = await restoreService.restore(encBundle, { password: 'wrong' });
    expect(result.errors[0]).toContain('Failed to decrypt');
  });
});

describe('Backup Routes', () => {
  let backupService: BackupService;
  let restoreService: RestoreService;

  beforeEach(() => {
    const sRepo = mockServerRepo();
    const pRepo = mockProfileRepo();
    const prRepo = mockProjectRepo();
    backupService = new BackupService(sRepo, pRepo, prRepo);

    const rSRepo = mockServerRepo();
    (rSRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    const rPRepo = mockProfileRepo();
    (rPRepo.findByServerAndName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    const rPrRepo = mockProjectRepo();
    (rPrRepo.findByName as ReturnType<typeof vi.fn>).mockResolvedValue(null);
    restoreService = new RestoreService(rSRepo, rPRepo, rPrRepo);
  });

  async function buildApp() {
    const app = Fastify();
    registerBackupRoutes(app, { backupService, restoreService });
    return app;
  }

  it('POST /api/v1/backup returns bundle', async () => {
    const app = await buildApp();
    const res = await app.inject({
      method: 'POST',
      url: '/api/v1/backup',
      payload: {},
    });

    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body.version).toBe('1');
    expect(body.servers).toBeDefined();
    expect(body.profiles).toBeDefined();
    expect(body.projects).toBeDefined();
  });

  it('POST /api/v1/restore imports bundle', async () => {
    const app = await buildApp();
    const bundle = await backupService.createBackup();

    const res = await app.inject({
      method: 'POST',
      url: '/api/v1/restore',
      payload: { bundle, conflictStrategy: 'skip' },
    });

    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body.serversCreated).toBeDefined();
  });

  it('POST /api/v1/restore rejects invalid bundle', async () => {
    const app = await buildApp();
    const res = await app.inject({
      method: 'POST',
      url: '/api/v1/restore',
      payload: { bundle: { invalid: true } },
    });

    expect(res.statusCode).toBe(400);
    expect(res.json().error).toContain('Invalid');
  });
});