# Copyright (c) Microsoft. All rights reserved.

from unittest.mock import patch

import pytest

try:
    from litellm import completion as _litellm_completion  # noqa: F401
except Exception:
    pytest.skip("LiteLLM import surface required by tau2 is unavailable.", allow_module_level=True)

from agent_framework._types import Content, Message
from agent_framework_lab_tau2._message_utils import flip_messages, log_messages


def test_flip_messages_user_to_assistant():
    """Test flipping user message to assistant."""
    messages = [
        Message(
            role="user",
            contents=[Content.from_text(text="Hello assistant")],
            author_name="User1",
            message_id="msg_001",
        )
    ]

    flipped = flip_messages(messages)

    assert len(flipped) == 1
    assert flipped[0].role == "assistant"
    assert flipped[0].text == "Hello assistant"
    assert flipped[0].author_name == "User1"
    assert flipped[0].message_id == "msg_001"


def test_flip_messages_assistant_to_user():
    """Test flipping assistant message to user."""
    messages = [
        Message(
            role="assistant",
            contents=[Content.from_text(text="Hello user")],
            author_name="Assistant1",
            message_id="msg_002",
        )
    ]

    flipped = flip_messages(messages)

    assert len(flipped) == 1
    assert flipped[0].role == "user"
    assert flipped[0].text == "Hello user"
    assert flipped[0].author_name == "Assistant1"
    assert flipped[0].message_id == "msg_002"


def test_flip_messages_assistant_with_function_calls_filtered():
    """Test that function calls are filtered out when flipping assistant to user."""
    function_call = Content.from_function_call(call_id="call_123", name="test_function", arguments={"param": "value"})

    messages = [
        Message(
            role="assistant",
            contents=[
                Content.from_text(text="I'll call a function"),
                function_call,
                Content.from_text(text="After the call"),
            ],
            message_id="msg_003",
        )
    ]

    flipped = flip_messages(messages)

    assert len(flipped) == 1
    assert flipped[0].role == "user"
    # Function call should be filtered out
    assert len(flipped[0].contents) == 2
    assert all(content.type == "text" for content in flipped[0].contents)
    assert "I'll call a function" in flipped[0].text
    assert "After the call" in flipped[0].text


def test_flip_messages_assistant_with_only_function_calls_skipped():
    """Test that assistant messages with only function calls are skipped."""
    function_call = Content.from_function_call(call_id="call_456", name="another_function", arguments={"key": "value"})

    messages = [
        Message(role="assistant", contents=[function_call], message_id="msg_004")  # Only function call, no text
    ]

    flipped = flip_messages(messages)

    # Should be empty since the message had no text content after filtering
    assert len(flipped) == 0


def test_flip_messages_tool_messages_skipped():
    """Test that tool messages are skipped."""
    function_result = Content.from_function_result(call_id="call_789", result={"success": True})

    messages = [Message(role="tool", contents=[function_result])]

    flipped = flip_messages(messages)

    # Tool messages should be skipped
    assert len(flipped) == 0


def test_flip_messages_system_messages_preserved():
    """Test that system messages are preserved as-is."""
    messages = [Message(role="system", contents=[Content.from_text(text="System instruction")], message_id="sys_001")]

    flipped = flip_messages(messages)

    assert len(flipped) == 1
    assert flipped[0].role == "system"
    assert flipped[0].text == "System instruction"
    assert flipped[0].message_id == "sys_001"


def test_flip_messages_mixed_conversation():
    """Test flipping a mixed conversation."""
    function_call = Content.from_function_call(call_id="call_mixed", name="mixed_function", arguments={})

    function_result = Content.from_function_result(call_id="call_mixed", result="function result")

    messages = [
        Message(role="system", contents=[Content.from_text(text="System prompt")]),
        Message(role="user", contents=[Content.from_text(text="User question")]),
        Message(role="assistant", contents=[Content.from_text(text="Assistant response"), function_call]),
        Message(role="tool", contents=[function_result]),
        Message(role="assistant", contents=[Content.from_text(text="Final response")]),
    ]

    flipped = flip_messages(messages)

    # Should have: system (unchanged), assistant (from user), user (from assistant, filtered),
    # assistant (from final assistant)
    assert len(flipped) == 4

    # Check each flipped message
    assert flipped[0].role == "system"
    assert flipped[0].text == "System prompt"

    assert flipped[1].role == "assistant"
    assert flipped[1].text == "User question"

    assert flipped[2].role == "user"
    assert flipped[2].text == "Assistant response"  # Function call filtered out

    # Tool message skipped

    assert flipped[3].role == "user"
    assert flipped[3].text == "Final response"


def test_flip_messages_empty_list():
    """Test flipping empty message list."""
    messages: list[Message] = []
    flipped = flip_messages(messages)
    assert len(flipped) == 0


def test_flip_messages_preserves_metadata():
    """Test that message metadata is preserved during flipping."""
    messages = [
        Message(
            role="user",
            contents=[Content.from_text(text="Test message")],
            author_name="TestUser",
            message_id="test_123",
        )
    ]

    flipped = flip_messages(messages)

    assert len(flipped) == 1
    assert flipped[0].author_name == "TestUser"
    assert flipped[0].message_id == "test_123"


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_text_content(mock_logger):
    """Test logging messages with text content."""
    messages = [
        Message(role="user", contents=[Content.from_text(text="Hello")]),
        Message(role="assistant", contents=[Content.from_text(text="Hi there!")]),
    ]

    log_messages(messages)

    # Should have called logger.info for each message
    assert mock_logger.opt.return_value.info.call_count == 2


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_function_call(mock_logger):
    """Test logging messages with function calls."""
    function_call = Content.from_function_call(call_id="call_log", name="log_function", arguments={"param": "value"})

    messages = [Message(role="assistant", contents=[function_call])]

    log_messages(messages)

    # Should log the function call
    mock_logger.opt.return_value.info.assert_called()
    call_args = mock_logger.opt.return_value.info.call_args[0][0]
    assert "TOOL_CALL" in call_args
    assert "log_function" in call_args


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_function_result(mock_logger):
    """Test logging messages with function results."""
    function_result = Content.from_function_result(call_id="call_result", result="success")

    messages = [Message(role="tool", contents=[function_result])]

    log_messages(messages)

    # Should log the function result
    mock_logger.opt.return_value.info.assert_called()
    call_args = mock_logger.opt.return_value.info.call_args[0][0]
    assert "TOOL_RESULT" in call_args


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_different_roles(mock_logger):
    """Test logging messages with different roles get different colors."""
    messages = [
        Message(role="system", contents=[Content.from_text(text="System")]),
        Message(role="user", contents=[Content.from_text(text="User")]),
        Message(role="assistant", contents=[Content.from_text(text="Assistant")]),
        Message(role="tool", contents=[Content.from_text(text="Tool")]),
    ]

    log_messages(messages)

    # Should have called logger for each message
    assert mock_logger.opt.return_value.info.call_count == 4

    # Check that different color tags are used
    calls = mock_logger.opt.return_value.info.call_args_list
    system_call = calls[0][0][0]
    user_call = calls[1][0][0]
    assistant_call = calls[2][0][0]
    tool_call = calls[3][0][0]

    assert "cyan" in system_call or "SYSTEM" in system_call
    assert "green" in user_call or "USER" in user_call
    assert "blue" in assistant_call or "ASSISTANT" in assistant_call
    assert "yellow" in tool_call or "TOOL" in tool_call


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_escapes_html(mock_logger):
    """Test that HTML-like characters are properly escaped in log output."""
    messages = [Message(role="user", contents=[Content.from_text(text="Message with <tag> content")])]

    log_messages(messages)

    mock_logger.opt.return_value.info.assert_called()
    call_args = mock_logger.opt.return_value.info.call_args[0][0]
    # Should escape < characters
    assert "\\<tag>" in call_args or "&lt;tag&gt;" in call_args


@patch("agent_framework_lab_tau2._message_utils.logger")
def test_log_messages_mixed_content_types(mock_logger):
    """Test logging messages with mixed content types."""
    function_call = Content.from_function_call(call_id="mixed_call", name="mixed_function", arguments={"key": "value"})

    messages = [
        Message(
            role="assistant",
            contents=[Content.from_text(text="I'll call a function"), function_call, Content.from_text(text="Done!")],
        )
    ]

    log_messages(messages)

    # Should log multiple times for different content types
    assert mock_logger.opt.return_value.info.call_count == 3
