# Create server parameters for stdio connection
import os
import pytest
import asyncio


from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client
from litellm import experimental_mcp_client
import litellm
import json


@pytest.mark.xfail(
    reason="Fails due to missing 'mcp' package and connection issues in CI/local env."
)
@pytest.mark.asyncio
async def test_mcp_agent():
    """Test MCP agent functionality with a simple math server"""
    try:
        local_server_path = "./mcp_server.py"
        ci_cd_server_path = "tests/mcp_tests/mcp_server.py"

        # Use the correct path for the server
        server_path = (
            ci_cd_server_path
            if os.path.exists(ci_cd_server_path)
            else local_server_path
        )

        if not os.path.exists(server_path):
            pytest.skip(f"MCP server file not found at {server_path}")

        server_params = StdioServerParameters(
            command="python3",
            args=[server_path],
        )

        # Add timeout to prevent hanging
        async with asyncio.timeout(30):  # 30 second timeout
            async with stdio_client(server_params) as (read, write):
                async with ClientSession(read, write) as session:
                    # Initialize the connection
                    await session.initialize()

                    # Get tools
                    tools = await experimental_mcp_client.load_mcp_tools(
                        session=session, format="openai"
                    )
                    print("MCP TOOLS: ", tools)

                    # Create and run the agent
                    messages = [{"role": "user", "content": "what's (3 + 5)"}]
                    llm_response = await litellm.acompletion(
                        model="gpt-4o",
                        api_key=os.getenv("OPENAI_API_KEY"),
                        messages=messages,
                        tools=tools,
                        tool_choice="required",
                    )
                    print(
                        "LLM RESPONSE: ",
                        json.dumps(llm_response, indent=4, default=str),
                    )
                    # Add assertions to verify the response
                    assert (
                        llm_response["choices"][0]["message"]["tool_calls"] is not None
                    )

                    assert (
                        llm_response["choices"][0]["message"]["tool_calls"][0][
                            "function"
                        ]["name"]
                        == "add"
                    )
                    openai_tool = llm_response["choices"][0]["message"]["tool_calls"][0]

                    # Call the tool using MCP client
                    call_result = await experimental_mcp_client.call_openai_tool(
                        session=session,
                        openai_tool=openai_tool,
                    )
                    print("CALL RESULT: ", call_result)

                    # send the tool result to the LLM
                    messages.append(llm_response["choices"][0]["message"])
                    messages.append(
                        {
                            "role": "tool",
                            "content": str(call_result.content[0].text),
                            "tool_call_id": openai_tool["id"],
                        }
                    )
                    print("final messages: ", messages)
                    llm_response = await litellm.acompletion(
                        model="gpt-4o",
                        api_key=os.getenv("OPENAI_API_KEY"),
                        messages=messages,
                        tools=tools,
                    )
                    print(
                        "FINAL LLM RESPONSE: ",
                        json.dumps(llm_response, indent=4, default=str),
                    )
    except asyncio.TimeoutError:
        pytest.skip("MCP server connection timed out - skipping test")
    except Exception as e:
        pytest.skip(f"MCP test failed with error: {str(e)} - skipping test")
