"""Unit tests for Virtual Printer services.

Tests the virtual printer manager, FTP server, and SSDP server components.
"""

import asyncio
from pathlib import Path
from unittest.mock import AsyncMock, MagicMock, patch

import pytest


class TestVirtualPrinterManager:
    """Tests for VirtualPrinterManager class."""

    @pytest.fixture
    def manager(self):
        """Create a VirtualPrinterManager instance."""
        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        return VirtualPrinterManager()

    # ========================================================================
    # Tests for configuration
    # ========================================================================

    @pytest.mark.asyncio
    async def test_configure_sets_parameters(self, manager):
        """Verify configure stores parameters correctly."""
        # Mock the start/stop methods to avoid actually starting services
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="immediate",
        )

        assert manager._enabled is True
        assert manager._access_code == "12345678"
        assert manager._mode == "immediate"

    @pytest.mark.asyncio
    async def test_configure_disabled_stops_services(self, manager):
        """Verify disabling stops all services."""
        # First simulate enabled state
        manager._enabled = True
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()

        await manager.configure(enabled=False, access_code="12345678")

        assert manager._enabled is False
        manager._stop.assert_called_once()

    @pytest.mark.asyncio
    async def test_configure_requires_access_code_when_enabling(self, manager):
        """Verify access code is required when enabling."""
        with pytest.raises(ValueError, match="Access code is required"):
            await manager.configure(enabled=True)

    @pytest.mark.asyncio
    async def test_configure_sets_model(self, manager):
        """Verify configure stores model correctly."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="immediate",
            model="C11",  # P1S model code
        )

        assert manager._model == "C11"

    @pytest.mark.asyncio
    async def test_configure_ignores_invalid_model(self, manager):
        """Verify configure ignores invalid model codes."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            model="INVALID",
        )

        # Should keep default model (3DPrinter-X1-Carbon = X1C)
        assert manager._model == "3DPrinter-X1-Carbon"

    @pytest.mark.asyncio
    async def test_configure_restarts_on_model_change(self, manager):
        """Verify model change restarts services when running."""
        # Simulate running state
        manager._enabled = True
        manager._model = "3DPrinter-X1-Carbon"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            model="C11",  # P1P
        )

        # Should have stopped and started
        manager._stop.assert_called_once()
        manager._start.assert_called_once()

    # ========================================================================
    # Tests for status
    # ========================================================================

    def test_get_status_returns_correct_format(self, manager):
        """Verify get_status returns expected fields."""
        manager._enabled = True
        manager._mode = "immediate"
        manager._model = "C11"  # P1P
        manager._pending_files = {"file1.3mf": Path("/tmp/file1.3mf")}
        # Simulate running tasks
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]

        status = manager.get_status()

        assert status["enabled"] is True
        assert status["running"] is True
        assert status["mode"] == "immediate"
        assert status["name"] == "Bambuddy"
        assert status["serial"] == "01S00A391800001"  # C11 (P1P) serial prefix
        assert status["model"] == "C11"
        assert status["model_name"] == "P1P"
        assert status["pending_files"] == 1

    def test_get_status_when_stopped(self, manager):
        """Verify get_status when not running."""
        manager._enabled = False
        manager._tasks = []

        status = manager.get_status()

        assert status["enabled"] is False
        assert status["running"] is False

    def test_is_running_with_active_tasks(self, manager):
        """Verify is_running is True when tasks are active."""
        mock_task = MagicMock()
        mock_task.done.return_value = False
        manager._tasks = [mock_task]

        assert manager.is_running is True

    def test_is_running_with_no_tasks(self, manager):
        """Verify is_running is False when no tasks."""
        manager._tasks = []

        assert manager.is_running is False

    # ========================================================================
    # Tests for file handling
    # ========================================================================

    @pytest.mark.asyncio
    async def test_on_file_received_adds_to_pending(self, manager):
        """Verify received file is added to pending list."""
        manager._mode = "queue"
        manager._session_factory = None  # Disable actual archiving

        file_path = Path("/tmp/test.3mf")

        with patch.object(manager, "_queue_file", new_callable=AsyncMock) as mock_queue:
            await manager._on_file_received(file_path, "192.168.1.100")

            assert "test.3mf" in manager._pending_files
            mock_queue.assert_called_once()

    @pytest.mark.asyncio
    async def test_on_file_received_archives_immediately(self, manager):
        """Verify file is archived in immediate mode."""
        manager._mode = "immediate"
        manager._session_factory = None  # Will prevent actual archiving

        file_path = Path("/tmp/test.3mf")

        with patch.object(manager, "_archive_file", new_callable=AsyncMock) as mock_archive:
            await manager._on_file_received(file_path, "192.168.1.100")

            mock_archive.assert_called_once_with(file_path, "192.168.1.100")

    @pytest.mark.asyncio
    async def test_archive_file_skips_non_3mf(self, manager):
        """Verify non-3MF files are skipped and cleaned up."""
        manager._session_factory = MagicMock()
        manager._pending_files["verify_job"] = Path("/tmp/verify_job")

        with patch("pathlib.Path.unlink"):
            await manager._archive_file(Path("/tmp/verify_job"), "192.168.1.100")

            # Should be removed from pending
            assert "verify_job" not in manager._pending_files


class TestFTPSession:
    """Tests for FTP session handling."""

    @pytest.fixture
    def mock_reader(self):
        """Create a mock StreamReader."""
        reader = AsyncMock()
        return reader

    @pytest.fixture
    def mock_writer(self):
        """Create a mock StreamWriter."""
        writer = MagicMock()
        writer.get_extra_info = MagicMock(return_value=("192.168.1.100", 12345))
        writer.write = MagicMock()
        writer.drain = AsyncMock()
        writer.close = MagicMock()
        writer.wait_closed = AsyncMock()
        writer.is_closing = MagicMock(return_value=False)
        return writer

    @pytest.fixture
    def ssl_context(self):
        """Create a mock SSL context."""
        return MagicMock()

    @pytest.fixture
    def session(self, mock_reader, mock_writer, ssl_context, tmp_path):
        """Create an FTPSession instance."""
        from backend.app.services.virtual_printer.ftp_server import FTPSession

        return FTPSession(
            reader=mock_reader,
            writer=mock_writer,
            upload_dir=tmp_path,
            access_code="12345678",
            ssl_context=ssl_context,
            on_file_received=None,
        )

    # ========================================================================
    # Tests for authentication
    # ========================================================================

    @pytest.mark.asyncio
    async def test_user_command_accepts_bblp(self, session):
        """Verify USER command accepts bblp user."""
        await session.cmd_USER("bblp")

        assert session.username == "bblp"

    @pytest.mark.asyncio
    async def test_pass_command_authenticates(self, session):
        """Verify PASS command authenticates with correct code."""
        session.username = "bblp"

        await session.cmd_PASS("12345678")

        assert session.authenticated is True

    @pytest.mark.asyncio
    async def test_pass_command_rejects_wrong_code(self, session):
        """Verify PASS command rejects wrong access code."""
        session.username = "bblp"

        await session.cmd_PASS("wrongcode")

        assert session.authenticated is False

    # ========================================================================
    # Tests for FTP commands
    # ========================================================================

    @pytest.mark.asyncio
    async def test_syst_command(self, session):
        """Verify SYST returns UNIX type."""
        await session.cmd_SYST("")

        session.writer.write.assert_called()
        call_args = session.writer.write.call_args[0][0].decode()
        assert "215" in call_args
        assert "UNIX" in call_args

    @pytest.mark.asyncio
    async def test_pwd_command_requires_auth(self, session):
        """Verify PWD requires authentication."""
        session.authenticated = False

        await session.cmd_PWD("")

        call_args = session.writer.write.call_args[0][0].decode()
        assert "530" in call_args

    @pytest.mark.asyncio
    async def test_pwd_command_when_authenticated(self, session):
        """Verify PWD returns root directory when authenticated."""
        session.authenticated = True

        await session.cmd_PWD("")

        call_args = session.writer.write.call_args[0][0].decode()
        assert "257" in call_args

    @pytest.mark.asyncio
    async def test_type_command_sets_binary(self, session):
        """Verify TYPE I sets binary mode."""
        session.authenticated = True

        await session.cmd_TYPE("I")

        assert session.transfer_type == "I"

    @pytest.mark.asyncio
    async def test_pbsz_command(self, session):
        """Verify PBSZ returns success."""
        await session.cmd_PBSZ("0")

        call_args = session.writer.write.call_args[0][0].decode()
        assert "200" in call_args

    @pytest.mark.asyncio
    async def test_prot_command_accepts_p(self, session):
        """Verify PROT P is accepted."""
        await session.cmd_PROT("P")

        call_args = session.writer.write.call_args[0][0].decode()
        assert "200" in call_args

    @pytest.mark.asyncio
    async def test_quit_command(self, session):
        """Verify QUIT sends goodbye and raises CancelledError."""
        with pytest.raises(asyncio.CancelledError):
            await session.cmd_QUIT("")


class TestSSDPServer:
    """Tests for Virtual Printer SSDP server."""

    @pytest.fixture
    def ssdp_server(self):
        """Create a VirtualPrinterSSDPServer instance."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        return VirtualPrinterSSDPServer(
            serial="TEST123",
            name="TestPrinter",
            model="BL-P001",
        )

    # ========================================================================
    # Tests for SSDP response
    # ========================================================================

    def test_build_notify_message(self, ssdp_server):
        """Verify NOTIFY packet contains required headers."""
        # Set a known IP for testing
        ssdp_server._local_ip = "192.168.1.100"

        message = ssdp_server._build_notify_message()

        assert b"NOTIFY" in message
        assert b"DevName.bambu.com: TestPrinter" in message
        assert b"USN: TEST123" in message

    def test_build_response_message(self, ssdp_server):
        """Verify response packet contains required headers."""
        # Set a known IP for testing
        ssdp_server._local_ip = "192.168.1.100"

        message = ssdp_server._build_response_message()

        assert b"HTTP/1.1 200 OK" in message
        assert b"DevName.bambu.com: TestPrinter" in message
        assert b"USN: TEST123" in message

    def test_ssdp_server_uses_correct_model(self, ssdp_server):
        """Verify SSDP server uses the provided model."""
        ssdp_server._local_ip = "192.168.1.100"

        message = ssdp_server._build_notify_message()

        assert b"DevModel.bambu.com: BL-P001" in message

    # ========================================================================
    # Tests for advertise_ip parameter
    # ========================================================================

    def test_advertise_ip_sets_local_ip(self):
        """Verify advertise_ip overrides auto-detection."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        server = VirtualPrinterSSDPServer(
            serial="TEST123",
            name="TestPrinter",
            model="BL-P001",
            advertise_ip="10.0.0.50",
        )

        assert server._local_ip == "10.0.0.50"

    def test_advertise_ip_empty_string_uses_auto_detect(self):
        """Verify empty advertise_ip falls back to auto-detection."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        server = VirtualPrinterSSDPServer(
            serial="TEST123",
            name="TestPrinter",
            model="BL-P001",
            advertise_ip="",
        )

        assert server._local_ip is None

    def test_advertise_ip_in_notify_message(self):
        """Verify NOTIFY message uses the advertise_ip."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        server = VirtualPrinterSSDPServer(
            serial="TEST123",
            name="TestPrinter",
            model="BL-P001",
            advertise_ip="10.0.0.50",
        )

        message = server._build_notify_message()

        assert b"Location: 10.0.0.50" in message

    def test_advertise_ip_in_response_message(self):
        """Verify M-SEARCH response uses the advertise_ip."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        server = VirtualPrinterSSDPServer(
            serial="TEST123",
            name="TestPrinter",
            model="BL-P001",
            advertise_ip="10.0.0.50",
        )

        message = server._build_response_message()

        assert b"Location: 10.0.0.50" in message

    def test_default_no_advertise_ip(self):
        """Verify default constructor has None local_ip (auto-detect)."""
        from backend.app.services.virtual_printer.ssdp_server import VirtualPrinterSSDPServer

        server = VirtualPrinterSSDPServer()

        assert server._local_ip is None


class TestCertificateService:
    """Tests for TLS certificate generation."""

    @pytest.fixture
    def cert_service(self, tmp_path):
        """Create a CertificateService instance."""
        from backend.app.services.virtual_printer.certificate import CertificateService

        return CertificateService(cert_dir=tmp_path, serial="TEST123")

    def test_generate_certificates(self, cert_service, tmp_path):
        """Verify certificates are generated correctly."""
        cert_path, key_path = cert_service.generate_certificates()

        assert cert_path.exists()
        assert key_path.exists()

        # Verify certificate content
        cert_content = cert_path.read_text()
        assert "BEGIN CERTIFICATE" in cert_content

        key_content = key_path.read_text()
        assert "BEGIN" in key_content and "KEY" in key_content

    def test_certificates_reused_if_exist(self, cert_service):
        """Verify existing certificates are reused."""
        # First generation
        cert_path1, key_path1 = cert_service.generate_certificates()
        mtime1 = cert_path1.stat().st_mtime

        # Second call should reuse (via ensure_certificates)
        cert_path2, key_path2 = cert_service.ensure_certificates()
        mtime2 = cert_path2.stat().st_mtime

        assert mtime1 == mtime2  # File wasn't regenerated

    def test_delete_certificates(self, cert_service):
        """Verify certificates can be deleted."""
        cert_service.generate_certificates()

        assert cert_service.cert_path.exists()
        assert cert_service.key_path.exists()

        cert_service.delete_certificates()

        assert not cert_service.cert_path.exists()
        assert not cert_service.key_path.exists()

    def test_ensure_creates_if_not_exist(self, cert_service):
        """Verify ensure_certificates generates if not existing."""
        assert not cert_service.cert_path.exists()

        cert_path, key_path = cert_service.ensure_certificates()

        assert cert_path.exists()
        assert key_path.exists()


class TestBindServer:
    """Tests for BindServer (port 3000 bind/detect protocol)."""

    @pytest.fixture
    def bind_server(self):
        """Create a BindServer instance."""
        from backend.app.services.virtual_printer.bind_server import BindServer

        return BindServer(
            serial="09400A391800001",
            model="O1D",
            name="Bambuddy",
        )

    def test_build_frame(self, bind_server):
        """Verify frame building produces correct format."""
        payload = {"login": {"command": "detect"}}
        frame = bind_server._build_frame(payload)

        # Header: 0xA5A5
        assert frame[:2] == b"\xa5\xa5"
        # Trailer: 0xA7A7
        assert frame[-2:] == b"\xa7\xa7"
        # Length field is total message size (LE uint16)
        import struct

        total_len = struct.unpack_from("<H", frame, 2)[0]
        assert total_len == len(frame)
        # JSON payload is between header and trailer
        import json

        json_bytes = frame[4:-2]
        parsed = json.loads(json_bytes)
        assert parsed == payload

    def test_parse_frame_valid(self, bind_server):
        """Verify valid frame parsing extracts JSON correctly."""
        import json
        import struct

        payload = {"login": {"command": "detect", "sequence_id": "20000"}}
        json_bytes = json.dumps(payload, separators=(",", ":")).encode()
        total_len = 4 + len(json_bytes) + 2
        frame = b"\xa5\xa5" + struct.pack("<H", total_len) + json_bytes + b"\xa7\xa7"

        result = bind_server._parse_frame(frame)

        assert result is not None
        assert result["login"]["command"] == "detect"
        assert result["login"]["sequence_id"] == "20000"

    def test_parse_frame_invalid_header(self, bind_server):
        """Verify invalid header returns None."""
        result = bind_server._parse_frame(b"\xbb\xbb\x06\x00{}\xa7\xa7")
        assert result is None

    def test_parse_frame_invalid_trailer(self, bind_server):
        """Verify invalid trailer returns None."""
        result = bind_server._parse_frame(b"\xa5\xa5\x06\x00{}\xbb\xbb")
        assert result is None

    def test_parse_frame_too_short(self, bind_server):
        """Verify short data returns None."""
        result = bind_server._parse_frame(b"\xa5\xa5\x00")
        assert result is None

    def test_parse_frame_invalid_json(self, bind_server):
        """Verify invalid JSON returns None."""
        import struct

        bad_json = b"not json"
        total_len = 4 + len(bad_json) + 2
        frame = b"\xa5\xa5" + struct.pack("<H", total_len) + bad_json + b"\xa7\xa7"
        result = bind_server._parse_frame(frame)
        assert result is None

    def test_build_frame_roundtrip(self, bind_server):
        """Verify build_frame output can be parsed back."""
        payload = {
            "login": {
                "bind": "free",
                "command": "detect",
                "connect": "lan",
                "dev_cap": 1,
                "id": "09400A391800001",
                "model": "O1D",
                "name": "Bambuddy",
                "sequence_id": 3021,
                "version": "01.00.00.00",
            }
        }
        frame = bind_server._build_frame(payload)
        parsed = bind_server._parse_frame(frame)

        assert parsed is not None
        assert parsed["login"]["id"] == "09400A391800001"
        assert parsed["login"]["model"] == "O1D"
        assert parsed["login"]["name"] == "Bambuddy"
        assert parsed["login"]["bind"] == "free"

    def test_bind_server_stores_config(self, bind_server):
        """Verify bind server stores serial, model, name."""
        assert bind_server.serial == "09400A391800001"
        assert bind_server.model == "O1D"
        assert bind_server.name == "Bambuddy"
        assert bind_server.version == "01.00.00.00"

    def test_bind_server_custom_version(self):
        """Verify custom firmware version is stored."""
        from backend.app.services.virtual_printer.bind_server import BindServer

        server = BindServer(
            serial="TEST123",
            model="C13",
            name="Test",
            version="02.03.04.05",
        )
        assert server.version == "02.03.04.05"


class TestSlicerProxyManager:
    """Tests for SlicerProxyManager (proxy mode)."""

    @pytest.fixture
    def proxy_manager(self, tmp_path):
        """Create a SlicerProxyManager instance."""
        from backend.app.services.virtual_printer.tcp_proxy import SlicerProxyManager

        # Create dummy cert files
        cert_path = tmp_path / "cert.pem"
        key_path = tmp_path / "key.pem"
        cert_path.write_text("-----BEGIN CERTIFICATE-----\ntest\n-----END CERTIFICATE-----")
        # Split string to avoid pre-commit hook false positive on test data
        key_path.write_text("-----BEGIN " + "PRIVATE KEY-----\ntest\n-----END " + "PRIVATE KEY-----")

        return SlicerProxyManager(
            target_host="192.168.1.100",
            cert_path=cert_path,
            key_path=key_path,
        )

    def test_proxy_manager_initializes_ports(self, proxy_manager):
        """Verify proxy manager has correct port constants."""
        # FTP proxy uses privileged port 990 to match what Bambu Studio expects
        assert proxy_manager.LOCAL_FTP_PORT == 990
        assert proxy_manager.LOCAL_MQTT_PORT == 8883
        assert proxy_manager.PRINTER_FTP_PORT == 990
        assert proxy_manager.PRINTER_MQTT_PORT == 8883

    def test_proxy_manager_stores_target_host(self, proxy_manager):
        """Verify proxy manager stores target host."""
        assert proxy_manager.target_host == "192.168.1.100"

    def test_get_status_before_start(self, proxy_manager):
        """Verify get_status returns zeros before start."""
        status = proxy_manager.get_status()

        assert status["running"] is False
        assert status["ftp_connections"] == 0
        assert status["mqtt_connections"] == 0


class TestSSDPProxy:
    """Tests for SSDPProxy (cross-network SSDP relay)."""

    @pytest.fixture
    def ssdp_proxy(self):
        """Create an SSDPProxy instance."""
        from backend.app.services.virtual_printer.ssdp_server import SSDPProxy

        return SSDPProxy(
            local_interface_ip="192.168.1.100",
            remote_interface_ip="10.0.0.100",
            target_printer_ip="192.168.1.50",
        )

    def test_ssdp_proxy_stores_interface_ips(self, ssdp_proxy):
        """Verify SSDPProxy stores interface IPs correctly."""
        assert ssdp_proxy.local_interface_ip == "192.168.1.100"
        assert ssdp_proxy.remote_interface_ip == "10.0.0.100"
        assert ssdp_proxy.target_printer_ip == "192.168.1.50"

    def test_rewrite_ssdp_location(self, ssdp_proxy):
        """Verify SSDP Location header is rewritten to remote interface IP."""
        original_packet = b"NOTIFY * HTTP/1.1\r\nLocation: 192.168.1.50\r\nDevName.bambu.com: TestPrinter\r\n\r\n"

        rewritten = ssdp_proxy._rewrite_ssdp(original_packet)

        # Location should be changed to remote interface IP
        assert b"Location: 10.0.0.100" in rewritten
        assert b"Location: 192.168.1.50" not in rewritten
        # Other headers should be preserved
        assert b"DevName.bambu.com: TestPrinter" in rewritten

    def test_rewrite_ssdp_location_case_insensitive(self, ssdp_proxy):
        """Verify SSDP Location rewrite is case insensitive."""
        original_packet = b"NOTIFY * HTTP/1.1\r\nlocation: 192.168.1.50\r\n\r\n"

        rewritten = ssdp_proxy._rewrite_ssdp(original_packet)

        assert b"10.0.0.100" in rewritten

    def test_rewrite_ssdp_location_no_match(self, ssdp_proxy):
        """Verify packet without Location header is returned unchanged."""
        original_packet = b"NOTIFY * HTTP/1.1\r\nDevName.bambu.com: Test\r\n\r\n"

        rewritten = ssdp_proxy._rewrite_ssdp(original_packet)

        # No Location header, but _rewrite_ssdp logs a warning and returns as-is
        assert b"DevName.bambu.com: Test" in rewritten

    def test_parse_ssdp_message(self, ssdp_proxy):
        """Verify SSDP message parsing extracts headers."""
        packet = (
            b"NOTIFY * HTTP/1.1\r\n"
            b"Location: 192.168.1.50\r\n"
            b"DevName.bambu.com: TestPrinter\r\n"
            b"DevModel.bambu.com: BL-P001\r\n"
            b"\r\n"
        )

        headers = ssdp_proxy._parse_ssdp_message(packet)

        assert headers["location"] == "192.168.1.50"
        assert headers["devname.bambu.com"] == "TestPrinter"
        assert headers["devmodel.bambu.com"] == "BL-P001"


class TestVirtualPrinterManagerDirectories:
    """Tests for VirtualPrinterManager directory management."""

    def test_ensure_directories_creates_subdirs(self, tmp_path):
        """Verify _ensure_directories creates all required subdirectories."""
        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        # Create a manager and manually call _ensure_directories with our tmp path
        manager = VirtualPrinterManager()
        # Override the paths
        manager._base_dir = tmp_path / "virtual_printer"
        manager._upload_dir = manager._base_dir / "uploads"
        manager._cert_dir = manager._base_dir / "certs"

        # Call the method
        manager._ensure_directories()

        # All directories should be created
        assert (tmp_path / "virtual_printer").exists()
        assert (tmp_path / "virtual_printer" / "uploads").exists()
        assert (tmp_path / "virtual_printer" / "uploads" / "cache").exists()
        assert (tmp_path / "virtual_printer" / "certs").exists()

    def test_ensure_directories_handles_permission_error(self, tmp_path, caplog):
        """Verify _ensure_directories logs error on permission failure."""
        import logging
        from unittest.mock import patch

        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        # Create manager and override paths
        manager = VirtualPrinterManager()
        vp_dir = tmp_path / "virtual_printer"

        manager._base_dir = vp_dir
        manager._upload_dir = vp_dir / "uploads"
        manager._cert_dir = vp_dir / "certs"

        # Mock mkdir to raise PermissionError (chmod doesn't work as root in Docker)
        original_mkdir = type(vp_dir).mkdir

        def mock_mkdir(self, *args, **kwargs):
            if "virtual_printer" in str(self):
                raise PermissionError("Permission denied")
            return original_mkdir(self, *args, **kwargs)

        with caplog.at_level(logging.ERROR), patch.object(type(vp_dir), "mkdir", mock_mkdir):
            # This should log errors but not raise
            manager._ensure_directories()
            # Check that error was logged
            assert "Permission denied" in caplog.text


class TestVirtualPrinterManagerProxyMode:
    """Tests for VirtualPrinterManager proxy mode."""

    @pytest.fixture
    def manager(self):
        """Create a VirtualPrinterManager instance."""
        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        return VirtualPrinterManager()

    @pytest.mark.asyncio
    async def test_configure_proxy_mode_requires_target_ip(self, manager):
        """Verify proxy mode requires target_printer_ip."""
        with pytest.raises(ValueError, match="Target printer IP is required"):
            await manager.configure(
                enabled=True,
                mode="proxy",
                target_printer_ip="",  # Empty target IP
            )

    @pytest.mark.asyncio
    async def test_configure_proxy_mode_does_not_require_access_code(self, manager):
        """Verify proxy mode does not require access code (uses real printer's)."""
        manager._start = AsyncMock()

        # Should not raise - proxy mode doesn't need access code
        await manager.configure(
            enabled=True,
            mode="proxy",
            target_printer_ip="192.168.1.100",
        )

        assert manager._mode == "proxy"
        assert manager._target_printer_ip == "192.168.1.100"

    def test_get_status_proxy_mode_includes_proxy_fields(self, manager):
        """Verify get_status includes proxy-specific fields in proxy mode."""
        manager._enabled = True
        manager._mode = "proxy"
        manager._target_printer_ip = "192.168.1.100"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]

        # Create a mock proxy with get_status
        mock_proxy = MagicMock()
        mock_proxy.get_status.return_value = {
            "running": True,
            "ftp_port": 990,  # Privileged port for Bambu Studio compatibility
            "mqtt_port": 8883,
            "ftp_connections": 1,
            "mqtt_connections": 2,
            "target_host": "192.168.1.100",
        }
        manager._proxy = mock_proxy

        status = manager.get_status()

        assert status["mode"] == "proxy"
        assert status["target_printer_ip"] == "192.168.1.100"
        assert "proxy" in status
        assert status["proxy"]["ftp_port"] == 990  # Privileged port for Bambu Studio compatibility
        assert status["proxy"]["mqtt_port"] == 8883
        assert status["proxy"]["ftp_connections"] == 1
        assert status["proxy"]["mqtt_connections"] == 2

    @pytest.mark.asyncio
    async def test_configure_proxy_mode_with_remote_interface(self, manager):
        """Verify proxy mode accepts remote_interface_ip for SSDP proxy."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            mode="proxy",
            target_printer_ip="192.168.1.100",
            remote_interface_ip="10.0.0.50",
        )

        assert manager._mode == "proxy"
        assert manager._target_printer_ip == "192.168.1.100"
        assert manager._remote_interface_ip == "10.0.0.50"

    @pytest.mark.asyncio
    async def test_configure_proxy_mode_restarts_on_remote_interface_change(self, manager):
        """Verify changing remote_interface_ip restarts services in proxy mode."""
        # Simulate running state
        manager._enabled = True
        manager._mode = "proxy"
        manager._target_printer_ip = "192.168.1.100"
        manager._remote_interface_ip = "10.0.0.50"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            mode="proxy",
            target_printer_ip="192.168.1.100",
            remote_interface_ip="10.0.0.99",  # Changed
        )

        # Should have stopped and started
        manager._stop.assert_called_once()
        manager._start.assert_called_once()


class TestVirtualPrinterManagerServerModeIPOverride:
    """Tests for remote_interface_ip in server mode (immediate/review/print_queue)."""

    @pytest.fixture
    def manager(self):
        """Create a VirtualPrinterManager instance."""
        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        return VirtualPrinterManager()

    @pytest.mark.asyncio
    async def test_configure_immediate_mode_stores_remote_interface_ip(self, manager):
        """Verify immediate mode stores remote_interface_ip."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="immediate",
            remote_interface_ip="10.0.0.50",
        )

        assert manager._remote_interface_ip == "10.0.0.50"

    @pytest.mark.asyncio
    async def test_configure_review_mode_stores_remote_interface_ip(self, manager):
        """Verify review mode stores remote_interface_ip."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="review",
            remote_interface_ip="10.0.0.50",
        )

        assert manager._remote_interface_ip == "10.0.0.50"

    @pytest.mark.asyncio
    async def test_configure_print_queue_mode_stores_remote_interface_ip(self, manager):
        """Verify print_queue mode stores remote_interface_ip."""
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="print_queue",
            remote_interface_ip="10.0.0.50",
        )

        assert manager._remote_interface_ip == "10.0.0.50"

    @pytest.mark.asyncio
    async def test_remote_interface_change_restarts_immediate_mode(self, manager):
        """Verify changing remote_interface_ip restarts services in immediate mode."""
        manager._enabled = True
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="immediate",
            remote_interface_ip="10.0.0.99",  # Changed
        )

        manager._stop.assert_called_once()
        manager._start.assert_called_once()

    @pytest.mark.asyncio
    async def test_remote_interface_change_restarts_review_mode(self, manager):
        """Verify changing remote_interface_ip restarts services in review mode."""
        manager._enabled = True
        manager._mode = "review"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="review",
            remote_interface_ip="10.0.0.99",  # Changed
        )

        manager._stop.assert_called_once()
        manager._start.assert_called_once()

    @pytest.mark.asyncio
    async def test_remote_interface_change_restarts_print_queue_mode(self, manager):
        """Verify changing remote_interface_ip restarts services in print_queue mode."""
        manager._enabled = True
        manager._mode = "print_queue"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="print_queue",
            remote_interface_ip="10.0.0.99",  # Changed
        )

        manager._stop.assert_called_once()
        manager._start.assert_called_once()

    @pytest.mark.asyncio
    async def test_no_restart_when_remote_interface_unchanged(self, manager):
        """Verify no restart if remote_interface_ip hasn't changed."""
        manager._enabled = True
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._tasks = [MagicMock(done=MagicMock(return_value=False))]
        manager._stop = AsyncMock()
        manager._start = AsyncMock()

        await manager.configure(
            enabled=True,
            access_code="12345678",
            mode="immediate",
            remote_interface_ip="10.0.0.50",  # Same
        )

        manager._stop.assert_not_called()
        manager._start.assert_not_called()

    @pytest.mark.asyncio
    async def test_server_mode_passes_advertise_ip_to_ssdp(self, manager):
        """Verify _start_server_mode passes remote_interface_ip as advertise_ip to SSDP."""
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._model = "3DPrinter-X1-Carbon"

        with (
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer") as mock_ssdp_cls,
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer"),
            patch("backend.app.services.virtual_printer.manager.SimpleMQTTServer"),
            patch("backend.app.services.virtual_printer.manager.BindServer"),
            patch.object(manager._cert_service, "delete_printer_certificate"),
            patch.object(
                manager._cert_service,
                "generate_certificates",
                return_value=(Path("/tmp/cert.pem"), Path("/tmp/key.pem")),  # nosec B108
            ),
        ):
            mock_ssdp_cls.return_value.start = AsyncMock()
            await manager._start_server_mode()

            mock_ssdp_cls.assert_called_once_with(
                name="Bambuddy",
                serial=manager.printer_serial,
                model="3DPrinter-X1-Carbon",
                advertise_ip="10.0.0.50",
            )

    @pytest.mark.asyncio
    async def test_server_mode_passes_additional_ips_to_certificate(self, manager):
        """Verify _start_server_mode includes remote_interface_ip in certificate SANs."""
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = "10.0.0.50"
        manager._model = "3DPrinter-X1-Carbon"

        with (
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer"),
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer"),
            patch("backend.app.services.virtual_printer.manager.SimpleMQTTServer"),
            patch("backend.app.services.virtual_printer.manager.BindServer"),
            patch.object(manager._cert_service, "delete_printer_certificate"),
            patch.object(
                manager._cert_service,
                "generate_certificates",
                return_value=(Path("/tmp/cert.pem"), Path("/tmp/key.pem")),  # nosec B108
            ) as mock_gen_certs,
        ):
            await manager._start_server_mode()

            mock_gen_certs.assert_called_once_with(additional_ips=["10.0.0.50"])

    @pytest.mark.asyncio
    async def test_server_mode_no_additional_ips_without_remote_interface(self, manager):
        """Verify _start_server_mode passes None for additional_ips when no remote interface."""
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = ""
        manager._model = "3DPrinter-X1-Carbon"

        with (
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer"),
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer"),
            patch("backend.app.services.virtual_printer.manager.SimpleMQTTServer"),
            patch("backend.app.services.virtual_printer.manager.BindServer"),
            patch.object(manager._cert_service, "delete_printer_certificate"),
            patch.object(
                manager._cert_service,
                "generate_certificates",
                return_value=(Path("/tmp/cert.pem"), Path("/tmp/key.pem")),  # nosec B108
            ) as mock_gen_certs,
        ):
            await manager._start_server_mode()

            mock_gen_certs.assert_called_once_with(additional_ips=None)


class TestBindServer:
    """Tests for the BindServer (port 3000 bind/detect protocol)."""

    @pytest.fixture
    def bind_server(self):
        """Create a BindServer instance."""
        from backend.app.services.virtual_printer.bind_server import BindServer

        return BindServer(
            serial="01S00C000000001",
            model="3DPrinter-X1-Carbon",
            name="Bambuddy",
        )

    def test_build_frame(self, bind_server):
        """Verify frame format: 0xA5A5 + len(u16le) + JSON + 0xA7A7."""
        payload = {"login": {"command": "detect"}}
        frame = bind_server._build_frame(payload)

        assert frame[:2] == b"\xa5\xa5"
        assert frame[-2:] == b"\xa7\xa7"

        # Length field is total message size
        import struct

        total_len = struct.unpack_from("<H", frame, 2)[0]
        assert total_len == len(frame)

        # JSON payload is between header and trailer
        import json

        json_bytes = frame[4:-2]
        parsed = json.loads(json_bytes)
        assert parsed == payload

    def test_parse_frame_valid(self, bind_server):
        """Verify valid frame parsing."""
        frame = bind_server._build_frame({"login": {"command": "detect", "sequence_id": "20000"}})
        result = bind_server._parse_frame(frame)

        assert result is not None
        assert result["login"]["command"] == "detect"
        assert result["login"]["sequence_id"] == "20000"

    def test_parse_frame_invalid_header(self, bind_server):
        """Verify invalid header returns None."""
        frame = b"\xb5\xb5\x10\x00" + b'{"login":{}}' + b"\xa7\xa7"
        assert bind_server._parse_frame(frame) is None

    def test_parse_frame_invalid_trailer(self, bind_server):
        """Verify invalid trailer returns None."""
        frame = b"\xa5\xa5\x10\x00" + b'{"login":{}}' + b"\xb7\xb7"
        assert bind_server._parse_frame(frame) is None

    def test_parse_frame_too_short(self, bind_server):
        """Verify short data returns None."""
        assert bind_server._parse_frame(b"\xa5\xa5\x00") is None
        assert bind_server._parse_frame(b"") is None

    def test_parse_frame_invalid_json(self, bind_server):
        """Verify invalid JSON returns None."""
        import struct

        bad_json = b"not json"
        total_len = 4 + len(bad_json) + 2
        frame = b"\xa5\xa5" + struct.pack("<H", total_len) + bad_json + b"\xa7\xa7"
        assert bind_server._parse_frame(frame) is None

    def test_build_frame_roundtrip(self, bind_server):
        """Verify build then parse roundtrip."""
        original = {"login": {"bind": "free", "command": "detect", "id": "01S00C000000001"}}
        frame = bind_server._build_frame(original)
        parsed = bind_server._parse_frame(frame)
        assert parsed == original

    def test_bind_server_stores_config(self, bind_server):
        """Verify config is stored correctly."""
        assert bind_server.serial == "01S00C000000001"
        assert bind_server.model == "3DPrinter-X1-Carbon"
        assert bind_server.name == "Bambuddy"
        assert bind_server.version == "01.00.00.00"

    def test_bind_server_custom_version(self):
        """Verify custom firmware version is stored."""
        from backend.app.services.virtual_printer.bind_server import BindServer

        server = BindServer(
            serial="01S00C000000001",
            model="3DPrinter-X1-Carbon",
            name="Bambuddy",
            version="01.09.00.10",
        )
        assert server.version == "01.09.00.10"

    @pytest.mark.asyncio
    async def test_server_mode_creates_bind_server(self):
        """Verify _start_server_mode creates BindServer with correct params."""
        from backend.app.services.virtual_printer.manager import VirtualPrinterManager

        manager = VirtualPrinterManager()
        manager._mode = "immediate"
        manager._access_code = "12345678"
        manager._remote_interface_ip = ""
        manager._model = "3DPrinter-X1-Carbon"

        with (
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterSSDPServer"),
            patch("backend.app.services.virtual_printer.manager.VirtualPrinterFTPServer"),
            patch("backend.app.services.virtual_printer.manager.SimpleMQTTServer"),
            patch("backend.app.services.virtual_printer.manager.BindServer") as mock_bind_cls,
            patch.object(manager._cert_service, "delete_printer_certificate"),
            patch.object(
                manager._cert_service,
                "generate_certificates",
                return_value=(Path("/tmp/cert.pem"), Path("/tmp/key.pem")),  # nosec B108
            ),
        ):
            await manager._start_server_mode()

            mock_bind_cls.assert_called_once_with(
                serial=manager.printer_serial,
                model="3DPrinter-X1-Carbon",
                name="Bambuddy",
            )