import { Command } from 'commander';
import { Client, QueryResult } from 'pg';
import { TenantsCommand } from '../../commands/tenants';
import { NileAPI } from '../../lib/api';
import { ConfigManager } from '../../lib/config';
import { Auth } from '../../lib/auth';
import { GlobalOptions } from '../../lib/globalOptions';

// Mock dependencies
jest.mock('pg');
jest.mock('../../lib/api');
jest.mock('../../lib/config');
jest.mock('../../lib/auth');

// Custom error class for process.exit
class ProcessExitError extends Error {
  constructor(code: number | string | null | undefined) {
    super(`Process.exit called with code: ${code}`);
    this.name = 'ProcessExitError';
  }
}

// Mock process.exit
let mockExit: jest.SpyInstance;

beforeAll(() => {
  mockExit = jest.spyOn(process, 'exit').mockImplementation((code?: number | string | null | undefined) => {
    throw new ProcessExitError(code);
  });
});

afterAll(() => {
  mockExit.mockRestore();
});

describe('Tenants Command', () => {
  let program: Command;
  let mockClient: jest.Mocked<Client>;
  let mockNileAPI: jest.Mocked<NileAPI>;
  let mockConfigManager: jest.Mocked<ConfigManager>;
  let mockAuth: jest.Mocked<Auth>;
  let getOptions: () => GlobalOptions;

  beforeEach(() => {
    // Reset mocks before each test
    jest.clearAllMocks();
    
    // Setup mock pg client
    mockClient = {
      query: jest.fn(),
      connect: jest.fn().mockResolvedValue(undefined),
      end: jest.fn().mockResolvedValue(undefined),
    } as unknown as jest.Mocked<Client>;
    (Client as unknown as jest.Mock).mockImplementation(() => mockClient);

    // Setup mock NileAPI
    mockNileAPI = {
      getDatabaseConnection: jest.fn().mockResolvedValue({
        host: 'test-host',
        port: 5432,
        database: 'test-db',
        user: 'test-user',
        password: 'test-pass'
      }),
      createDatabaseCredentials: jest.fn().mockResolvedValue({
        id: 'test-user',
        password: 'test-pass',
        database: {
          region: 'AWS_US_WEST_2',
          name: 'test-db'
        }
      })
    } as unknown as jest.Mocked<NileAPI>;
    (NileAPI as unknown as jest.Mock).mockImplementation(() => mockNileAPI);

    // Setup mock options
    getOptions = () => ({
      workspace: 'test-workspace',
      db: 'test-database',
      dbHost: 'test-host',
      globalHost: 'test-global-host',
      apiKey: 'test-token'
    });

    // Setup mock ConfigManager
    mockConfigManager = {
      getWorkspace: jest.fn().mockReturnValue('test-workspace'),
      getDatabase: jest.fn().mockReturnValue('test-database'),
      getToken: jest.fn().mockReturnValue('test-token'),
      getDbHost: jest.fn().mockReturnValue('test-host'),
      getGlobalHost: jest.fn().mockReturnValue('test-global-host'),
      getAuthUrl: jest.fn().mockReturnValue('test-auth-url'),
      getDebug: jest.fn().mockReturnValue(false)
    } as unknown as jest.Mocked<ConfigManager>;
    (ConfigManager as unknown as jest.Mock).mockImplementation(() => mockConfigManager);

    // Mock Auth
    mockAuth = {
      getAuthorizationToken: jest.fn().mockResolvedValue('test-token')
    } as unknown as jest.Mocked<Auth>;
    (Auth as unknown as jest.Mock).mockImplementation(() => mockAuth);
    
    // Setup program and options
    program = new Command();
    new TenantsCommand(program, getOptions);
  });

  afterEach(async () => {
    await mockClient.end();
  });

  describe('list command', () => {
    it('should list all tenants', async () => {
      const mockTenants = [
        { id: 'tenant-1', name: 'Tenant 1' },
        { id: 'tenant-2', name: 'Tenant 2' }
      ];
      
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: mockTenants } as QueryResult);

      await program.parseAsync(['node', 'test', 'tenants', 'list']);

      expect(mockClient.query).toHaveBeenCalledWith('SELECT * FROM tenants');
      expect(mockClient.end).toHaveBeenCalled();
    });

    it('should handle empty tenant list', async () => {
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [] });

      await program.parseAsync(['node', 'test', 'tenants', 'list']);

      expect(mockClient.query).toHaveBeenCalled();
      expect(mockClient.end).toHaveBeenCalled();
    });
  });

  describe('create command', () => {
    it('should create a tenant with auto-generated ID', async () => {
      const mockTenant = { id: 'auto-id', name: 'New Tenant' };
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [mockTenant] });

      await program.parseAsync(['node', 'test', 'tenants', 'create', '--name', 'New Tenant']);

      expect(mockClient.query).toHaveBeenCalledWith(
        'INSERT INTO tenants (name) VALUES ($1) RETURNING *',
        ['New Tenant']
      );
      expect(mockClient.end).toHaveBeenCalled();
    });

    it('should create a tenant with custom ID', async () => {
      const mockTenant = { id: 'custom-id', name: 'New Tenant' };
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [mockTenant] });

      await program.parseAsync([
        'node', 'test', 'tenants', 'create',
        '--name', 'New Tenant',
        '--id', 'custom-id'
      ]);

      expect(mockClient.query).toHaveBeenCalledWith(
        'INSERT INTO tenants (id, name) VALUES ($1, $2) RETURNING *',
        ['custom-id', 'New Tenant']
      );
      expect(mockClient.end).toHaveBeenCalled();
    });

    it('should handle creation error', async () => {
      (mockClient.query as jest.Mock).mockRejectedValueOnce(new Error('Database error'));

      await expect(
        program.parseAsync(['node', 'test', 'tenants', 'create', '--name', 'New Tenant'])
      ).rejects.toThrow('Database error');

      expect(mockClient.end).toHaveBeenCalled();
    });
  });

  describe('update command', () => {
    it('should update tenant name', async () => {
      const mockTenant = { id: 'tenant-1', name: 'Updated Name' };
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [mockTenant], rowCount: 1 });

      await program.parseAsync([
        'node', 'test', 'tenants', 'update',
        '--id', 'tenant-1',
        '--new_name', 'Updated Name'
      ]);

      expect(mockClient.query).toHaveBeenCalledWith(
        'UPDATE tenants SET name = $1 WHERE id = $2 RETURNING *',
        ['Updated Name', 'tenant-1']
      );
      expect(mockClient.end).toHaveBeenCalled();
    });

    it('should handle non-existent tenant', async () => {
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [], rowCount: 0 });

      await expect(
        program.parseAsync([
          'node', 'test', 'tenants', 'update',
          '--id', 'non-existent',
          '--new_name', 'New Name'
        ])
      ).rejects.toThrow(`Tenant with ID 'non-existent' not found`);

      expect(mockClient.end).toHaveBeenCalled();
    });
  });

  describe('delete command', () => {
    it('should delete tenant', async () => {
      const mockTenant = { id: 'tenant-1', name: 'Tenant to Delete' };
      const mockQuery = mockClient.query as jest.Mock;
      mockQuery
        .mockResolvedValueOnce({ rows: [mockTenant], rowCount: 1 }) // For existence check
        .mockResolvedValueOnce({ rows: [mockTenant], rowCount: 1 }); // For deletion

      await program.parseAsync([
        'node', 'test', 'tenants', 'delete',
        '--id', 'tenant-1'
      ]);

      expect(mockClient.query).toHaveBeenCalledWith(
        'SELECT id, name FROM tenants WHERE id = $1',
        ['tenant-1']
      );
      expect(mockClient.query).toHaveBeenCalledWith(
        'DELETE FROM tenants WHERE id = $1',
        ['tenant-1']
      );
      expect(mockClient.end).toHaveBeenCalled();
    });

    it('should handle non-existent tenant deletion', async () => {
      (mockClient.query as jest.Mock).mockResolvedValueOnce({ rows: [], rowCount: 0 });

      await expect(
        program.parseAsync([
          'node', 'test', 'tenants', 'delete',
          '--id', 'non-existent'
        ])
      ).rejects.toThrow(`Tenant with ID 'non-existent' not found`);

      expect(mockClient.end).toHaveBeenCalled();
    });
  });

  describe('error handling', () => {
    it('should handle database errors gracefully', async () => {
      (mockClient.query as jest.Mock).mockRejectedValueOnce(new Error('Database error'));

      await expect(
        program.parseAsync(['node', 'test', 'tenants', 'create', '--name', 'New Tenant'])
      ).rejects.toThrow('Database error');

      expect(mockClient.end).toHaveBeenCalled();
    });
  });
});