import unittest
import docker
from docker.models.containers import Container
from sia.docker_module import DockerModule

class DockerModuleTest(unittest.TestCase):
    def test_initialization(self):
        """Test DockerModule initialization."""
        docker_module = DockerModule()
        self.assertIsInstance(docker_module, DockerModule)

    def test_start_container_short_lived(self):
        """Test starting a short-lived container."""
        docker_module = DockerModule()
        
        # Test parameters
        image = "sia:latest"
        timeout = 1000
        command = "echo"
        arguments = ["Hello World"]
        
        output = docker_module.start_container(
            image=image,
            timeout=timeout,
            command=command,
            arguments=arguments
        )
        
        # Verify output was returned
        self.assertEqual(output, "Hello World\n")

    def test_start_container_long_running(self):
        """Test starting a long-running container."""
        docker_module = DockerModule()
        
        name = "test-container"
        image = "sia:latest"
        
        container_name = docker_module.start_container(
            image=image,
            name=name
        )
        
        # Verify container was started and stored
        self.assertEqual(container_name, name)
        self.assertIn(name, docker_module.containers)
        self.assertEqual(docker_module.containers[name], self.mock_container)

    def test_start_container_with_volumes(self):
        """Test starting a container with volume mappings."""
        docker_module = DockerModule()
        
        volumes = {"./pdf": "/pdf"}
        output = docker_module.start_container(
            image="sia:latest",
            timeout=1000,
            volumes=volumes
        )
        
        # Verify volume bindings were configured correctly
        expected_binds = {
            "./pdf": {"bind": "/pdf", "mode": "rw"}
        }

    def test_invalid_container_start(self):
        """Test error handling for invalid container start."""
        docker_module = DockerModule()
        
        # Test missing required parameters
        with self.assertRaises(ValueError):
            docker_module.start_container(image="test:latest")

    def test_stop_container(self):
        """Test stopping a container."""
        docker_module = DockerModule()
        
        # Start a container first
        name = "test-container"
        docker_module.start_container(
            image="test:latest",
            name=name
        )
        
        # Stop the container
        docker_module.stop_container(name)
        
        # Verify container was stopped and removed
        self.mock_container.stop.assert_called_once()
        self.mock_container.remove.assert_called_once()
        self.assertNotIn(name, docker_module.containers)

    def test_stop_nonexistent_container(self):
        """Test stopping a container that doesn't exist."""
        docker_module = DockerModule()
        
        with self.assertRaises(KeyError):
            docker_module.stop_container("nonexistent")

    def test_container_io_operations(self):
        """Test container I/O operations."""
        docker_module = DockerModule()
        
        # Start a container
        name = "test-container"
        docker_module.start_container(
            image="test:latest",
            name=name
        )
        
        # Test stdin write
        test_input = "test input"
        mock_socket = Mock()
        mock_socket._sock = Mock()
        self.mock_container.attach_socket.return_value = mock_socket
        
        docker_module.write_container_stdin(name, test_input)
        mock_socket._sock.send.assert_called_once_with(test_input.encode('utf-8'))
        
        # Test stdout read
        stdout = docker_module.read_container_stdout(name)
        self.mock_container.logs.assert_called_with(
            stdout=True, 
            stderr=False, 
            tail='all'
        )
        self.assertEqual(stdout, "Test output")
        
        # Test stderr read
        stderr = docker_module.read_container_stderr(name)
        self.mock_container.logs.assert_called_with(
            stdout=False, 
            stderr=True, 
            tail='all'
        )
        self.assertEqual(stderr, "Test output")

    def test_wait_container(self):
        """Test waiting for container completion."""
        docker_module = DockerModule()
        
        # Start a container
        name = "test-container"
        docker_module.start_container(
            image="test:latest",
            name=name
        )
        
        # Test wait operation
        exit_code, output = docker_module.wait_container(name, timeout=1000)
        
        # Verify wait was called with correct timeout
        self.mock_container.wait.assert_called_once_with(timeout=1.0)
        self.assertEqual(exit_code, 0)
        self.assertEqual(output, "Test output")

    def test_get_container_status(self):
        """Test getting container status information."""
        docker_module = DockerModule()
        
        # Start a container
        name = "test-container"
        docker_module.start_container(
            image="test:latest",
            name=name
        )
        
        # Configure mock logs sizes
        self.mock_container.logs.side_effect = [b"stdout", b"stderr"]
        
        # Get status
        status = docker_module.get_container_status(name)
        
        # Verify status information
        self.assertEqual(status['name'], name)
        self.assertEqual(status['status'], "running")
        self.assertEqual(status['started_at'], "2024-10-23T10:00:00Z")
        self.assertEqual(status['exit_code'], 0)
        self.assertEqual(status['error'], "")
        self.assertEqual(status['stdout_size'], 6)  # len(b"stdout")
        self.assertEqual(status['stderr_size'], 6)  # len(b"stderr")
        
        # Verify container was reloaded
        self.mock_container.reload.assert_called_once()

if __name__ == '__main__':
    unittest.main()