import sys

import mock
import pytest
import zmq
import Queue
from robot_interface.endpoints.actuation_receiver import ActuationReceiver


@pytest.fixture
def zmq_context():
    """
    A pytest fixture that creates and yields a ZMQ context.

    :return: An initialized ZeroMQ context.
    :rtype: zmq.Context
    """
    context = zmq.Context()
    yield context

def test_force_speech_clears_queue(mocker):
    """
    Tests that a force speech message clears the existing queue
    and places the high-priority message at the front.
    """
    mocker.patch("threading.Thread")
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")
    
    mock_qi = mock.Mock()
    sys.modules["qi"] = mock_qi 

    mock_tts_service = mock.Mock()
    mock_state.qi_session.service.return_value = mock_tts_service

    # Use Mock Context
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    receiver._message_queue.put("old_message_1")
    receiver._message_queue.put("old_message_2")
    
    assert receiver._message_queue.qsize() == 2

    force_msg = {
        "endpoint": "actuate/speech", 
        "data": "Emergency Notification",
        "is_priority": True,
    }
    receiver.handle_message(force_msg)

    assert receiver._message_queue.qsize() == 1
    queued_item = receiver._message_queue.get()
    assert queued_item == "Emergency Notification"

def test_handle_unimplemented_endpoint(mocker):
    """
    Tests handling of unknown endpoints.
    """
    mocker.patch("threading.Thread")
    
    # Use Mock Context
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    receiver.handle_message({
        "endpoint": "some_endpoint_that_definitely_does_not_exist",
        "data": None,
    })

def test_speech_message_no_data(mocker):
    """
    Tests that if the message data is empty, the receiver returns immediately
    WITHOUT attempting to access the global robot state or session.
    """
    # 1. Prevent background threads from running
    mocker.patch("threading.Thread")
    
    # 2. Mock the global state object
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")

    # 3. Create a PropertyMock to track whenever 'qi_session' is accessed
    # We attach it to the class type of the mock so it acts like a real property
    mock_session_prop = mock.PropertyMock(return_value=None)
    type(mock_state).qi_session = mock_session_prop

    # 4. Initialize Receiver (Mocking the context to avoid ZMQ errors)
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    # 5. Send empty data
    receiver.handle_message({"endpoint": "actuate/speech", "data": ""})

    # 6. Assertion: 
    # Because the code does `if not text: return` BEFORE `if not state.qi_session`,
    # the state property should NEVER be read.
    mock_session_prop.assert_not_called()


def test_speech_message_invalid_data(mocker):
    """
    Tests that if the message data is not a string, the function returns.     
    :param mocker: Description
    """
    mocker.patch("threading.Thread")

    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")

    mock_session_prop = mock.PropertyMock(return_value=None)
    type(mock_state).qi_session = mock_session_prop

    # Use Mock Context
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    receiver.handle_message({"endpoint": "actuate/speech", "data": True})

    # Because the code does `if not text: return` BEFORE `if not state.qi_session`,
    # the state property should NEVER be read.
    mock_session_prop.assert_not_called()

def test_speech_no_qi(mocker):
    """
    Tests the actuation receiver's behavior when processing a speech request
    but the global state does not have an active QI session.
    """
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")

    mock_qi_session = mock.PropertyMock(return_value=None)
    type(mock_state).qi_session = mock_qi_session

    mock_tts_service = mock.Mock()

    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    receiver._tts_service = mock_tts_service

    receiver._handle_speech({"endpoint": "actuate/speech", "data": "Some message to speak."})

    receiver._tts_service.assert_not_called()


def test_speech(mocker):
    """
    Tests the core speech actuation functionality by mocking the QI TextToSpeech
    service and verifying that the received message is put into the queue.
    """
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")

    mock_qi = mock.Mock()
    sys.modules["qi"] = mock_qi

    mock_tts_service = mock.Mock()
    mock_state.qi_session = mock.Mock()
    mock_state.qi_session.service.return_value = mock_tts_service

    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)

    receiver._tts_service = None
    receiver._handle_speech({"endpoint": "actuate/speech", "data": "Some message to speak."})

    assert receiver._message_queue.qsize() == 1

    queued_item = receiver._message_queue.get()
    assert queued_item == "Some message to speak."

def test_speech_priority(mocker):
    """
    Tests that a priority speech message is handled correctly by clearing the queue
    and placing the priority message at the front.
    """
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")

    mock_qi = mock.Mock()
    sys.modules["qi"] = mock_qi

    mock_tts_service = mock.Mock()
    mock_state.qi_session = mock.Mock()
    mock_state.qi_session.service.return_value = mock_tts_service

    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)

    receiver._message_queue.put("old_message_1")
    receiver._message_queue.put("old_message_2")

    assert receiver._message_queue.qsize() == 2

    priority_msg = {
        "endpoint": "actuate/speech", 
        "data": "Urgent Message",
        "is_priority": True,
    }
    receiver._handle_speech(priority_msg)

    assert receiver._message_queue.qsize() == 1
    queued_item = receiver._message_queue.get()
    assert queued_item == "Urgent Message"

def test_handle_messages_loop(mocker):
    """
    Tests the background consumer loop (_handle_messages) processing an item.
    Runs SYNCHRONOUSLY to ensure coverage tools pick up the lines.
    """
    # Patch Thread so the real background thread NEVER starts automatically
    mocker.patch("threading.Thread")

    # Mock state
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")
        
    # Setup initial speaking state to False (covers "Started speaking" print)
    mock_state.is_speaking = False
    
    # Mock the TextToSpeech service
    mock_tts_service = mock.Mock()
    mock_state.qi_session.service.return_value = mock_tts_service
    
    # Initialize receiver (Thread is patched, so no thread starts)
    # Use Mock Context to avoid ZMQ errors
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    # Manually inject service (since lazy loading might handle it, but this is safer)
    receiver._tts_service = mock_tts_service

    # This ensures the while loop iterates exactly once
    mock_state.exit_event.is_set.side_effect = [False, True]

    # Put an item in the queue
    receiver._message_queue.put("Hello World")

    # RUN MANUALLY in the main thread
    # This executes the code: while -> try -> get -> if print -> speaking=True -> say
    receiver._handle_messages()

    # Assertions
    assert receiver._message_queue.empty()
    mock_tts_service.say.assert_called_with("Hello World")
    assert mock_state.is_speaking is True


def test_handle_messages_queue_empty(mocker):
    """
    Tests the Queue.Empty exception handler in the consumer loop.
    This covers the logic that resets 'state.is_speaking' to False.
    """
    # Prevent the real background thread from starting
    mocker.patch("threading.Thread")

    # Mock the state object
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")
        
    # Setup 'is_speaking' property mock
    # We set return_value=True so the code enters the 'if state.is_speaking:' block.
    # We use PropertyMock to track when this attribute is set.
    type(mock_state).is_speaking = True
    
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    # This ensures the while loop body runs exactly once for our test
    mock_state.exit_event.is_set.side_effect = [False, True]

    # Force get() to raise Queue.Empty immediately (simulate timeout)
    # We patch the 'get' method on the specific queue instance of our receiver
    #mocker.patch.object(receiver._message_queue, 'get', side_effect=Queue.Empty)
    
    # Run the loop logic manually (synchronously)
    receiver._handle_messages()

    # Final Assertion: Verify is_speaking was set to False
    # The code execution order is: read (returns True) -> print -> set (to False)
    # assert_called_with checks the arguments of the LAST call, which is the setter.
    assert mock_state.is_speaking is False


def test_handle_messages_runtime_error(mocker):
    """
    Tests the RuntimeError exception handler (e.g. lost WiFi connection).
    Uses a Mock ZMQ context to avoid 'Address already in use' errors.
    """
    # Patch Thread so we don't accidentally spawn real threads
    mocker.patch("threading.Thread")
    
    # Mock the state and logging
    mock_state = mocker.patch("robot_interface.endpoints.actuation_receiver.state")
        
    # Use a MOCK ZMQ context. 
    # This prevents the receiver from trying to bind to a real TCP port.
    mock_zmq_ctx = mock.Mock()
    
    # Initialize receiver with the mock context
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    mock_state.exit_event.is_set.side_effect = [False, True]

    receiver._message_queue.put("Test Message")
    
    # Setup: ...BUT the service raises RuntimeError when asked to speak
    mock_tts = mock.Mock()
    mock_tts.say.side_effect = RuntimeError("Connection lost")
    receiver._tts_service = mock_tts
    
    # Run the loop logic manually
    receiver._handle_messages()
    
    # Assertions
    assert mock_state.exit_event.is_set.called

def test_clear_queue(mocker):
    """
    Tests that the clear_queue method properly drains all items from the message queue.
    """
    mocker.patch("threading.Thread")
    
    # Use Mock Context
    mock_zmq_ctx = mock.Mock()
    receiver = ActuationReceiver(mock_zmq_ctx)
    
    # Populate the queue with multiple items
    receiver._message_queue.put("msg1")
    receiver._message_queue.put("msg2")
    receiver._message_queue.put("msg3")
    
    assert receiver._message_queue.qsize() == 3

    # Clear the queue
    receiver.clear_queue()

    # Assert the queue is empty
    assert receiver._message_queue.qsize() == 0